Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/proc/base.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * proc base directory handling functions |
| 7 | * |
| 8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. |
| 9 | * Instead of using magical inumbers to determine the kind of object |
| 10 | * we allocate and fill in-core inodes upon lookup. They don't even |
| 11 | * go into icache. We cache the reference to task_struct upon lookup too. |
| 12 | * Eventually it should become a filesystem in its own. We don't use the |
| 13 | * rest of procfs anymore. |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 14 | * |
| 15 | * |
| 16 | * Changelog: |
| 17 | * 17-Jan-2005 |
| 18 | * Allan Bezerra |
| 19 | * Bruna Moreira <bruna.moreira@indt.org.br> |
| 20 | * Edjard Mota <edjard.mota@indt.org.br> |
| 21 | * Ilias Biris <ilias.biris@indt.org.br> |
| 22 | * Mauricio Lin <mauricio.lin@indt.org.br> |
| 23 | * |
| 24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT |
| 25 | * |
| 26 | * A new process specific entry (smaps) included in /proc. It shows the |
| 27 | * size of rss for each memory area. The maps entry lacks information |
| 28 | * about physical memory size (rss) for each mapped file, i.e., |
| 29 | * rss information for executables and library files. |
| 30 | * This additional information is useful for any tools that need to know |
| 31 | * about physical memory consumption for a process specific library. |
| 32 | * |
| 33 | * Changelog: |
| 34 | * 21-Feb-2005 |
| 35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT |
| 36 | * Pud inclusion in the page table walking. |
| 37 | * |
| 38 | * ChangeLog: |
| 39 | * 10-Mar-2005 |
| 40 | * 10LE Instituto Nokia de Tecnologia - INdT: |
| 41 | * A better way to walks through the page table as suggested by Hugh Dickins. |
| 42 | * |
| 43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: |
| 44 | * Smaps information related to shared, private, clean and dirty pages. |
| 45 | * |
| 46 | * Paul Mundt <paul.mundt@nokia.com>: |
| 47 | * Overall revision about smaps. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | */ |
| 49 | |
| 50 | #include <asm/uaccess.h> |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <linux/errno.h> |
| 53 | #include <linux/time.h> |
| 54 | #include <linux/proc_fs.h> |
| 55 | #include <linux/stat.h> |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 56 | #include <linux/task_io_accounting_ops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #include <linux/init.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 58 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <linux/file.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 60 | #include <linux/fdtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/string.h> |
| 62 | #include <linux/seq_file.h> |
| 63 | #include <linux/namei.h> |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 64 | #include <linux/mnt_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include <linux/mm.h> |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 66 | #include <linux/swap.h> |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 67 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #include <linux/kallsyms.h> |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 69 | #include <linux/stacktrace.h> |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 70 | #include <linux/resource.h> |
Kees Cook | 5096add | 2007-05-08 00:26:04 -0700 | [diff] [blame] | 71 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #include <linux/mount.h> |
| 73 | #include <linux/security.h> |
| 74 | #include <linux/ptrace.h> |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 75 | #include <linux/tracehook.h> |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 76 | #include <linux/cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #include <linux/cpuset.h> |
| 78 | #include <linux/audit.h> |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 79 | #include <linux/poll.h> |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 80 | #include <linux/nsproxy.h> |
Alexey Dobriyan | 8ac773b | 2006-10-19 23:28:32 -0700 | [diff] [blame] | 81 | #include <linux/oom.h> |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 82 | #include <linux/elf.h> |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 83 | #include <linux/pid_namespace.h> |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 84 | #include <linux/fs_struct.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 85 | #include <linux/slab.h> |
Chris Metcalf | f133ecc | 2011-05-26 12:40:09 -0400 | [diff] [blame] | 86 | #ifdef CONFIG_HARDWALL |
| 87 | #include <asm/hardwall.h> |
| 88 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | #include "internal.h" |
| 90 | |
Eric W. Biederman | 0f2fe20 | 2006-06-26 00:25:46 -0700 | [diff] [blame] | 91 | /* NOTE: |
| 92 | * Implementing inode permission operations in /proc is almost |
| 93 | * certainly an error. Permission checks need to happen during |
| 94 | * each system call not at open time. The reason is that most of |
| 95 | * what we wish to check for permissions in /proc varies at runtime. |
| 96 | * |
| 97 | * The classic example of a problem is opening file descriptors |
| 98 | * in /proc for a task before it execs a suid executable. |
| 99 | */ |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | struct pid_entry { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | char *name; |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 103 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | mode_t mode; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 105 | const struct inode_operations *iop; |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 106 | const struct file_operations *fop; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 107 | union proc_op op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | }; |
| 109 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 110 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 111 | .name = (NAME), \ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 112 | .len = sizeof(NAME) - 1, \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 113 | .mode = MODE, \ |
| 114 | .iop = IOP, \ |
| 115 | .fop = FOP, \ |
| 116 | .op = OP, \ |
| 117 | } |
| 118 | |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 119 | #define DIR(NAME, MODE, iops, fops) \ |
| 120 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) |
| 121 | #define LNK(NAME, get_link) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 122 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 123 | &proc_pid_link_inode_operations, NULL, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 124 | { .proc_get_link = get_link } ) |
| 125 | #define REG(NAME, MODE, fops) \ |
| 126 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) |
| 127 | #define INF(NAME, MODE, read) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 128 | NOD(NAME, (S_IFREG|(MODE)), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 129 | NULL, &proc_info_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 130 | { .proc_read = read } ) |
| 131 | #define ONE(NAME, MODE, show) \ |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 132 | NOD(NAME, (S_IFREG|(MODE)), \ |
| 133 | NULL, &proc_single_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 134 | { .proc_show = show } ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 136 | /* |
| 137 | * Count the number of hardlinks for the pid_entry table, excluding the . |
| 138 | * and .. links. |
| 139 | */ |
| 140 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, |
| 141 | unsigned int n) |
| 142 | { |
| 143 | unsigned int i; |
| 144 | unsigned int count; |
| 145 | |
| 146 | count = 0; |
| 147 | for (i = 0; i < n; ++i) { |
| 148 | if (S_ISDIR(entries[i].mode)) |
| 149 | ++count; |
| 150 | } |
| 151 | |
| 152 | return count; |
| 153 | } |
| 154 | |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 155 | static int get_task_root(struct task_struct *task, struct path *root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 157 | int result = -ENOENT; |
| 158 | |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 159 | task_lock(task); |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 160 | if (task->fs) { |
| 161 | get_fs_root(task->fs, root); |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 162 | result = 0; |
| 163 | } |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 164 | task_unlock(task); |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 165 | return result; |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 168 | static int proc_cwd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 169 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 170 | struct task_struct *task = get_proc_task(inode); |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 171 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 172 | |
| 173 | if (task) { |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 174 | task_lock(task); |
| 175 | if (task->fs) { |
| 176 | get_fs_pwd(task->fs, path); |
| 177 | result = 0; |
| 178 | } |
| 179 | task_unlock(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 180 | put_task_struct(task); |
| 181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | return result; |
| 183 | } |
| 184 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 185 | static int proc_root_link(struct inode *inode, struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 187 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 189 | |
| 190 | if (task) { |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 191 | result = get_task_root(task, path); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 192 | put_task_struct(task); |
| 193 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | return result; |
| 195 | } |
| 196 | |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 197 | static struct mm_struct *__check_mem_permission(struct task_struct *task) |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 198 | { |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 199 | struct mm_struct *mm; |
| 200 | |
| 201 | mm = get_task_mm(task); |
| 202 | if (!mm) |
| 203 | return ERR_PTR(-EINVAL); |
| 204 | |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 205 | /* |
| 206 | * A task can always look at itself, in case it chooses |
| 207 | * to use system calls instead of load instructions. |
| 208 | */ |
| 209 | if (task == current) |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 210 | return mm; |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 211 | |
| 212 | /* |
| 213 | * If current is actively ptrace'ing, and would also be |
| 214 | * permitted to freshly attach with ptrace now, permit it. |
| 215 | */ |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 216 | if (task_is_stopped_or_traced(task)) { |
| 217 | int match; |
| 218 | rcu_read_lock(); |
Tejun Heo | 06d9847 | 2011-06-17 16:50:40 +0200 | [diff] [blame] | 219 | match = (ptrace_parent(task) == current); |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 220 | rcu_read_unlock(); |
| 221 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 222 | return mm; |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 223 | } |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 224 | |
| 225 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 226 | * No one else is allowed. |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 227 | */ |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 228 | mmput(mm); |
| 229 | return ERR_PTR(-EPERM); |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Stephen Wilson | 18f661b | 2011-03-13 15:49:22 -0400 | [diff] [blame] | 232 | /* |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 233 | * If current may access user memory in @task return a reference to the |
| 234 | * corresponding mm, otherwise ERR_PTR. |
Stephen Wilson | 18f661b | 2011-03-13 15:49:22 -0400 | [diff] [blame] | 235 | */ |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 236 | static struct mm_struct *check_mem_permission(struct task_struct *task) |
Stephen Wilson | 18f661b | 2011-03-13 15:49:22 -0400 | [diff] [blame] | 237 | { |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 238 | struct mm_struct *mm; |
Stephen Wilson | 18f661b | 2011-03-13 15:49:22 -0400 | [diff] [blame] | 239 | int err; |
| 240 | |
| 241 | /* |
| 242 | * Avoid racing if task exec's as we might get a new mm but validate |
| 243 | * against old credentials. |
| 244 | */ |
| 245 | err = mutex_lock_killable(&task->signal->cred_guard_mutex); |
| 246 | if (err) |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 247 | return ERR_PTR(err); |
Stephen Wilson | 18f661b | 2011-03-13 15:49:22 -0400 | [diff] [blame] | 248 | |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 249 | mm = __check_mem_permission(task); |
Stephen Wilson | 18f661b | 2011-03-13 15:49:22 -0400 | [diff] [blame] | 250 | mutex_unlock(&task->signal->cred_guard_mutex); |
| 251 | |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 252 | return mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 255 | struct mm_struct *mm_for_maps(struct task_struct *task) |
| 256 | { |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 257 | struct mm_struct *mm; |
Al Viro | ec6fd8a | 2011-02-15 22:22:54 -0500 | [diff] [blame] | 258 | int err; |
Oleg Nesterov | 00f89d2 | 2009-07-10 03:27:38 +0200 | [diff] [blame] | 259 | |
Al Viro | ec6fd8a | 2011-02-15 22:22:54 -0500 | [diff] [blame] | 260 | err = mutex_lock_killable(&task->signal->cred_guard_mutex); |
| 261 | if (err) |
| 262 | return ERR_PTR(err); |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 263 | |
| 264 | mm = get_task_mm(task); |
| 265 | if (mm && mm != current->mm && |
| 266 | !ptrace_may_access(task, PTRACE_MODE_READ)) { |
| 267 | mmput(mm); |
Al Viro | ec6fd8a | 2011-02-15 22:22:54 -0500 | [diff] [blame] | 268 | mm = ERR_PTR(-EACCES); |
Oleg Nesterov | 13f0fea | 2009-06-23 21:25:32 +0200 | [diff] [blame] | 269 | } |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 270 | mutex_unlock(&task->signal->cred_guard_mutex); |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 271 | |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 272 | return mm; |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 273 | } |
| 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
| 276 | { |
| 277 | int res = 0; |
| 278 | unsigned int len; |
| 279 | struct mm_struct *mm = get_task_mm(task); |
| 280 | if (!mm) |
| 281 | goto out; |
| 282 | if (!mm->arg_end) |
| 283 | goto out_mm; /* Shh! No looking before we're done */ |
| 284 | |
| 285 | len = mm->arg_end - mm->arg_start; |
| 286 | |
| 287 | if (len > PAGE_SIZE) |
| 288 | len = PAGE_SIZE; |
| 289 | |
| 290 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); |
| 291 | |
| 292 | // If the nul at the end of args has been overwritten, then |
| 293 | // assume application is using setproctitle(3). |
| 294 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { |
| 295 | len = strnlen(buffer, res); |
| 296 | if (len < res) { |
| 297 | res = len; |
| 298 | } else { |
| 299 | len = mm->env_end - mm->env_start; |
| 300 | if (len > PAGE_SIZE - res) |
| 301 | len = PAGE_SIZE - res; |
| 302 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); |
| 303 | res = strnlen(buffer, res); |
| 304 | } |
| 305 | } |
| 306 | out_mm: |
| 307 | mmput(mm); |
| 308 | out: |
| 309 | return res; |
| 310 | } |
| 311 | |
| 312 | static int proc_pid_auxv(struct task_struct *task, char *buffer) |
| 313 | { |
Al Viro | 2fadaef | 2011-02-15 22:52:11 -0500 | [diff] [blame] | 314 | struct mm_struct *mm = mm_for_maps(task); |
| 315 | int res = PTR_ERR(mm); |
| 316 | if (mm && !IS_ERR(mm)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | unsigned int nwords = 0; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 318 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | nwords += 2; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 320 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | res = nwords * sizeof(mm->saved_auxv[0]); |
| 322 | if (res > PAGE_SIZE) |
| 323 | res = PAGE_SIZE; |
| 324 | memcpy(buffer, mm->saved_auxv, res); |
| 325 | mmput(mm); |
| 326 | } |
| 327 | return res; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | #ifdef CONFIG_KALLSYMS |
| 332 | /* |
| 333 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. |
| 334 | * Returns the resolved symbol. If that fails, simply return the address. |
| 335 | */ |
| 336 | static int proc_pid_wchan(struct task_struct *task, char *buffer) |
| 337 | { |
Alexey Dobriyan | ffb4512 | 2007-05-08 00:28:41 -0700 | [diff] [blame] | 338 | unsigned long wchan; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 339 | char symname[KSYM_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | wchan = get_wchan(task); |
| 342 | |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 343 | if (lookup_symbol_name(wchan, symname) < 0) |
Jake Edge | f83ce3e | 2009-05-04 12:51:14 -0600 | [diff] [blame] | 344 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
| 345 | return 0; |
| 346 | else |
| 347 | return sprintf(buffer, "%lu", wchan); |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 348 | else |
| 349 | return sprintf(buffer, "%s", symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | #endif /* CONFIG_KALLSYMS */ |
| 352 | |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 353 | static int lock_trace(struct task_struct *task) |
| 354 | { |
| 355 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); |
| 356 | if (err) |
| 357 | return err; |
| 358 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) { |
| 359 | mutex_unlock(&task->signal->cred_guard_mutex); |
| 360 | return -EPERM; |
| 361 | } |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | static void unlock_trace(struct task_struct *task) |
| 366 | { |
| 367 | mutex_unlock(&task->signal->cred_guard_mutex); |
| 368 | } |
| 369 | |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 370 | #ifdef CONFIG_STACKTRACE |
| 371 | |
| 372 | #define MAX_STACK_TRACE_DEPTH 64 |
| 373 | |
| 374 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, |
| 375 | struct pid *pid, struct task_struct *task) |
| 376 | { |
| 377 | struct stack_trace trace; |
| 378 | unsigned long *entries; |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 379 | int err; |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 380 | int i; |
| 381 | |
| 382 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); |
| 383 | if (!entries) |
| 384 | return -ENOMEM; |
| 385 | |
| 386 | trace.nr_entries = 0; |
| 387 | trace.max_entries = MAX_STACK_TRACE_DEPTH; |
| 388 | trace.entries = entries; |
| 389 | trace.skip = 0; |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 390 | |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 391 | err = lock_trace(task); |
| 392 | if (!err) { |
| 393 | save_stack_trace_tsk(task, &trace); |
| 394 | |
| 395 | for (i = 0; i < trace.nr_entries; i++) { |
Linus Torvalds | b81a618 | 2011-03-23 20:51:42 -0700 | [diff] [blame] | 396 | seq_printf(m, "[<%pK>] %pS\n", |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 397 | (void *)entries[i], (void *)entries[i]); |
| 398 | } |
| 399 | unlock_trace(task); |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 400 | } |
| 401 | kfree(entries); |
| 402 | |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 403 | return err; |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 404 | } |
| 405 | #endif |
| 406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | #ifdef CONFIG_SCHEDSTATS |
| 408 | /* |
| 409 | * Provides /proc/PID/schedstat |
| 410 | */ |
| 411 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) |
| 412 | { |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 413 | return sprintf(buffer, "%llu %llu %lu\n", |
Ingo Molnar | 826e08b | 2008-12-22 07:37:41 +0100 | [diff] [blame] | 414 | (unsigned long long)task->se.sum_exec_runtime, |
| 415 | (unsigned long long)task->sched_info.run_delay, |
Ingo Molnar | 2d72376 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 416 | task->sched_info.pcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | #endif |
| 419 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 420 | #ifdef CONFIG_LATENCYTOP |
| 421 | static int lstats_show_proc(struct seq_file *m, void *v) |
| 422 | { |
| 423 | int i; |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 424 | struct inode *inode = m->private; |
| 425 | struct task_struct *task = get_proc_task(inode); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 426 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 427 | if (!task) |
| 428 | return -ESRCH; |
| 429 | seq_puts(m, "Latency Top version : v0.1\n"); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 430 | for (i = 0; i < 32; i++) { |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 431 | struct latency_record *lr = &task->latency_record[i]; |
| 432 | if (lr->backtrace[0]) { |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 433 | int q; |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 434 | seq_printf(m, "%i %li %li", |
| 435 | lr->count, lr->time, lr->max); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 436 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 437 | unsigned long bt = lr->backtrace[q]; |
| 438 | if (!bt) |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 439 | break; |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 440 | if (bt == ULONG_MAX) |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 441 | break; |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 442 | seq_printf(m, " %ps", (void *)bt); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 443 | } |
Alexey Dobriyan | 9d6de12 | 2011-01-12 17:00:32 -0800 | [diff] [blame] | 444 | seq_putc(m, '\n'); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | } |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 448 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | static int lstats_open(struct inode *inode, struct file *file) |
| 453 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 454 | return single_open(file, lstats_show_proc, inode); |
Hiroshi Shimamoto | d6643d1 | 2008-02-14 10:27:00 -0800 | [diff] [blame] | 455 | } |
| 456 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 457 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
| 458 | size_t count, loff_t *offs) |
| 459 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 460 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 461 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 462 | if (!task) |
| 463 | return -ESRCH; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 464 | clear_all_latency_tracing(task); |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 465 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 466 | |
| 467 | return count; |
| 468 | } |
| 469 | |
| 470 | static const struct file_operations proc_lstats_operations = { |
| 471 | .open = lstats_open, |
| 472 | .read = seq_read, |
| 473 | .write = lstats_write, |
| 474 | .llseek = seq_lseek, |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 475 | .release = single_release, |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 476 | }; |
| 477 | |
| 478 | #endif |
| 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | static int proc_oom_score(struct task_struct *task, char *buffer) |
| 481 | { |
Oleg Nesterov | b95c35e | 2010-04-01 15:13:57 +0200 | [diff] [blame] | 482 | unsigned long points = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 484 | read_lock(&tasklist_lock); |
Oleg Nesterov | b95c35e | 2010-04-01 15:13:57 +0200 | [diff] [blame] | 485 | if (pid_alive(task)) |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 486 | points = oom_badness(task, NULL, NULL, |
| 487 | totalram_pages + total_swap_pages); |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 488 | read_unlock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | return sprintf(buffer, "%lu\n", points); |
| 490 | } |
| 491 | |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 492 | struct limit_names { |
| 493 | char *name; |
| 494 | char *unit; |
| 495 | }; |
| 496 | |
| 497 | static const struct limit_names lnames[RLIM_NLIMITS] = { |
Kees Cook | cff4edb | 2009-09-22 16:45:32 -0700 | [diff] [blame] | 498 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 499 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
| 500 | [RLIMIT_DATA] = {"Max data size", "bytes"}, |
| 501 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, |
| 502 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, |
| 503 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, |
| 504 | [RLIMIT_NPROC] = {"Max processes", "processes"}, |
| 505 | [RLIMIT_NOFILE] = {"Max open files", "files"}, |
| 506 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, |
| 507 | [RLIMIT_AS] = {"Max address space", "bytes"}, |
| 508 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, |
| 509 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, |
| 510 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, |
| 511 | [RLIMIT_NICE] = {"Max nice priority", NULL}, |
| 512 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, |
Eugene Teo | 8808117 | 2008-02-23 15:23:52 -0800 | [diff] [blame] | 513 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 514 | }; |
| 515 | |
| 516 | /* Display limits for a process */ |
| 517 | static int proc_pid_limits(struct task_struct *task, char *buffer) |
| 518 | { |
| 519 | unsigned int i; |
| 520 | int count = 0; |
| 521 | unsigned long flags; |
| 522 | char *bufptr = buffer; |
| 523 | |
| 524 | struct rlimit rlim[RLIM_NLIMITS]; |
| 525 | |
Lai Jiangshan | a6bebbc | 2008-10-05 00:51:15 +0400 | [diff] [blame] | 526 | if (!lock_task_sighand(task, &flags)) |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 527 | return 0; |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 528 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
| 529 | unlock_task_sighand(task, &flags); |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 530 | |
| 531 | /* |
| 532 | * print the file header |
| 533 | */ |
| 534 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", |
| 535 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
| 536 | |
| 537 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 538 | if (rlim[i].rlim_cur == RLIM_INFINITY) |
| 539 | count += sprintf(&bufptr[count], "%-25s %-20s ", |
| 540 | lnames[i].name, "unlimited"); |
| 541 | else |
| 542 | count += sprintf(&bufptr[count], "%-25s %-20lu ", |
| 543 | lnames[i].name, rlim[i].rlim_cur); |
| 544 | |
| 545 | if (rlim[i].rlim_max == RLIM_INFINITY) |
| 546 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); |
| 547 | else |
| 548 | count += sprintf(&bufptr[count], "%-20lu ", |
| 549 | rlim[i].rlim_max); |
| 550 | |
| 551 | if (lnames[i].unit) |
| 552 | count += sprintf(&bufptr[count], "%-10s\n", |
| 553 | lnames[i].unit); |
| 554 | else |
| 555 | count += sprintf(&bufptr[count], "\n"); |
| 556 | } |
| 557 | |
| 558 | return count; |
| 559 | } |
| 560 | |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 561 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
| 562 | static int proc_pid_syscall(struct task_struct *task, char *buffer) |
| 563 | { |
| 564 | long nr; |
| 565 | unsigned long args[6], sp, pc; |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 566 | int res = lock_trace(task); |
| 567 | if (res) |
| 568 | return res; |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 569 | |
| 570 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 571 | res = sprintf(buffer, "running\n"); |
| 572 | else if (nr < 0) |
| 573 | res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
| 574 | else |
| 575 | res = sprintf(buffer, |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 576 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
| 577 | nr, |
| 578 | args[0], args[1], args[2], args[3], args[4], args[5], |
| 579 | sp, pc); |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 580 | unlock_trace(task); |
| 581 | return res; |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 582 | } |
| 583 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ |
| 584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | /************************************************************************/ |
| 586 | /* Here the fs part begins */ |
| 587 | /************************************************************************/ |
| 588 | |
| 589 | /* permission checks */ |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 590 | static int proc_fd_access_allowed(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | { |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 592 | struct task_struct *task; |
| 593 | int allowed = 0; |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 594 | /* Allow access to a task's file descriptors if it is us or we |
| 595 | * may use ptrace attach to the process and find out that |
| 596 | * information. |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 597 | */ |
| 598 | task = get_proc_task(inode); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 599 | if (task) { |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 600 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 601 | put_task_struct(task); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 602 | } |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 603 | return allowed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 606 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 607 | { |
| 608 | int error; |
| 609 | struct inode *inode = dentry->d_inode; |
| 610 | |
| 611 | if (attr->ia_valid & ATTR_MODE) |
| 612 | return -EPERM; |
| 613 | |
| 614 | error = inode_change_ok(inode, attr); |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 615 | if (error) |
| 616 | return error; |
| 617 | |
| 618 | if ((attr->ia_valid & ATTR_SIZE) && |
| 619 | attr->ia_size != i_size_read(inode)) { |
| 620 | error = vmtruncate(inode, attr->ia_size); |
| 621 | if (error) |
| 622 | return error; |
| 623 | } |
| 624 | |
| 625 | setattr_copy(inode, attr); |
| 626 | mark_inode_dirty(inode); |
| 627 | return 0; |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 628 | } |
| 629 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 630 | static const struct inode_operations proc_def_inode_operations = { |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 631 | .setattr = proc_setattr, |
| 632 | }; |
| 633 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 634 | static int mounts_open_common(struct inode *inode, struct file *file, |
| 635 | const struct seq_operations *op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 637 | struct task_struct *task = get_proc_task(inode); |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 638 | struct nsproxy *nsp; |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 639 | struct mnt_namespace *ns = NULL; |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 640 | struct path root; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 641 | struct proc_mounts *p; |
| 642 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 644 | if (task) { |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 645 | rcu_read_lock(); |
| 646 | nsp = task_nsproxy(task); |
| 647 | if (nsp) { |
| 648 | ns = nsp->mnt_ns; |
Alexey Dobriyan | 863c470 | 2007-01-26 00:56:53 -0800 | [diff] [blame] | 649 | if (ns) |
| 650 | get_mnt_ns(ns); |
| 651 | } |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 652 | rcu_read_unlock(); |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 653 | if (ns && get_task_root(task, &root) == 0) |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 654 | ret = 0; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 655 | put_task_struct(task); |
| 656 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 658 | if (!ns) |
| 659 | goto err; |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 660 | if (ret) |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 661 | goto err_put_ns; |
| 662 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 663 | ret = -ENOMEM; |
| 664 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); |
| 665 | if (!p) |
| 666 | goto err_put_path; |
| 667 | |
| 668 | file->private_data = &p->m; |
| 669 | ret = seq_open(file, op); |
| 670 | if (ret) |
| 671 | goto err_free; |
| 672 | |
| 673 | p->m.private = p; |
| 674 | p->ns = ns; |
| 675 | p->root = root; |
Kay Sievers | f151463 | 2011-07-12 20:48:39 +0200 | [diff] [blame] | 676 | p->m.poll_event = ns->event; |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 677 | |
| 678 | return 0; |
| 679 | |
| 680 | err_free: |
| 681 | kfree(p); |
| 682 | err_put_path: |
| 683 | path_put(&root); |
| 684 | err_put_ns: |
| 685 | put_mnt_ns(ns); |
| 686 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | return ret; |
| 688 | } |
| 689 | |
| 690 | static int mounts_release(struct inode *inode, struct file *file) |
| 691 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 692 | struct proc_mounts *p = file->private_data; |
| 693 | path_put(&p->root); |
| 694 | put_mnt_ns(p->ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | return seq_release(inode, file); |
| 696 | } |
| 697 | |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 698 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
| 699 | { |
| 700 | struct proc_mounts *p = file->private_data; |
KOSAKI Motohiro | 31b0709 | 2009-04-09 13:57:59 +0900 | [diff] [blame] | 701 | unsigned res = POLLIN | POLLRDNORM; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 702 | |
Al Viro | 9f5596a | 2010-02-05 00:40:25 -0500 | [diff] [blame] | 703 | poll_wait(file, &p->ns->poll, wait); |
| 704 | if (mnt_had_events(p)) |
KOSAKI Motohiro | 31b0709 | 2009-04-09 13:57:59 +0900 | [diff] [blame] | 705 | res |= POLLERR | POLLPRI; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 706 | |
| 707 | return res; |
| 708 | } |
| 709 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 710 | static int mounts_open(struct inode *inode, struct file *file) |
| 711 | { |
| 712 | return mounts_open_common(inode, file, &mounts_op); |
| 713 | } |
| 714 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 715 | static const struct file_operations proc_mounts_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | .open = mounts_open, |
| 717 | .read = seq_read, |
| 718 | .llseek = seq_lseek, |
| 719 | .release = mounts_release, |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 720 | .poll = mounts_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | }; |
| 722 | |
Ram Pai | 2d4d486 | 2008-03-27 13:06:25 +0100 | [diff] [blame] | 723 | static int mountinfo_open(struct inode *inode, struct file *file) |
| 724 | { |
| 725 | return mounts_open_common(inode, file, &mountinfo_op); |
| 726 | } |
| 727 | |
| 728 | static const struct file_operations proc_mountinfo_operations = { |
| 729 | .open = mountinfo_open, |
| 730 | .read = seq_read, |
| 731 | .llseek = seq_lseek, |
| 732 | .release = mounts_release, |
| 733 | .poll = mounts_poll, |
| 734 | }; |
| 735 | |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 736 | static int mountstats_open(struct inode *inode, struct file *file) |
| 737 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 738 | return mounts_open_common(inode, file, &mountstats_op); |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 739 | } |
| 740 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 741 | static const struct file_operations proc_mountstats_operations = { |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 742 | .open = mountstats_open, |
| 743 | .read = seq_read, |
| 744 | .llseek = seq_lseek, |
| 745 | .release = mounts_release, |
| 746 | }; |
| 747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
| 749 | |
| 750 | static ssize_t proc_info_read(struct file * file, char __user * buf, |
| 751 | size_t count, loff_t *ppos) |
| 752 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 753 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | unsigned long page; |
| 755 | ssize_t length; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 756 | struct task_struct *task = get_proc_task(inode); |
| 757 | |
| 758 | length = -ESRCH; |
| 759 | if (!task) |
| 760 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
| 762 | if (count > PROC_BLOCK_SIZE) |
| 763 | count = PROC_BLOCK_SIZE; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 764 | |
| 765 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 766 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 767 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | length = PROC_I(inode)->op.proc_read(task, (char*)page); |
| 770 | |
| 771 | if (length >= 0) |
| 772 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); |
| 773 | free_page(page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 774 | out: |
| 775 | put_task_struct(task); |
| 776 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | return length; |
| 778 | } |
| 779 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 780 | static const struct file_operations proc_info_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | .read = proc_info_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 782 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | }; |
| 784 | |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 785 | static int proc_single_show(struct seq_file *m, void *v) |
| 786 | { |
| 787 | struct inode *inode = m->private; |
| 788 | struct pid_namespace *ns; |
| 789 | struct pid *pid; |
| 790 | struct task_struct *task; |
| 791 | int ret; |
| 792 | |
| 793 | ns = inode->i_sb->s_fs_info; |
| 794 | pid = proc_pid(inode); |
| 795 | task = get_pid_task(pid, PIDTYPE_PID); |
| 796 | if (!task) |
| 797 | return -ESRCH; |
| 798 | |
| 799 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); |
| 800 | |
| 801 | put_task_struct(task); |
| 802 | return ret; |
| 803 | } |
| 804 | |
| 805 | static int proc_single_open(struct inode *inode, struct file *filp) |
| 806 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 807 | return single_open(filp, proc_single_show, inode); |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 808 | } |
| 809 | |
| 810 | static const struct file_operations proc_single_file_operations = { |
| 811 | .open = proc_single_open, |
| 812 | .read = seq_read, |
| 813 | .llseek = seq_lseek, |
| 814 | .release = single_release, |
| 815 | }; |
| 816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | static int mem_open(struct inode* inode, struct file* file) |
| 818 | { |
| 819 | file->private_data = (void*)((long)current->self_exec_id); |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 820 | /* OK to pass negative loff_t, we can catch out-of-range */ |
| 821 | file->f_mode |= FMODE_UNSIGNED_OFFSET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | return 0; |
| 823 | } |
| 824 | |
| 825 | static ssize_t mem_read(struct file * file, char __user * buf, |
| 826 | size_t count, loff_t *ppos) |
| 827 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 828 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | char *page; |
| 830 | unsigned long src = *ppos; |
| 831 | int ret = -ESRCH; |
| 832 | struct mm_struct *mm; |
| 833 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 834 | if (!task) |
| 835 | goto out_no_task; |
| 836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | ret = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 838 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | if (!page) |
| 840 | goto out; |
| 841 | |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 842 | mm = check_mem_permission(task); |
| 843 | ret = PTR_ERR(mm); |
| 844 | if (IS_ERR(mm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | goto out_free; |
| 846 | |
| 847 | ret = -EIO; |
| 848 | |
| 849 | if (file->private_data != (void*)((long)current->self_exec_id)) |
| 850 | goto out_put; |
| 851 | |
| 852 | ret = 0; |
| 853 | |
| 854 | while (count > 0) { |
| 855 | int this_len, retval; |
| 856 | |
| 857 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 858 | retval = access_remote_vm(mm, src, page, this_len, 0); |
| 859 | if (!retval) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | if (!ret) |
| 861 | ret = -EIO; |
| 862 | break; |
| 863 | } |
| 864 | |
| 865 | if (copy_to_user(buf, page, retval)) { |
| 866 | ret = -EFAULT; |
| 867 | break; |
| 868 | } |
| 869 | |
| 870 | ret += retval; |
| 871 | src += retval; |
| 872 | buf += retval; |
| 873 | count -= retval; |
| 874 | } |
| 875 | *ppos = src; |
| 876 | |
| 877 | out_put: |
| 878 | mmput(mm); |
| 879 | out_free: |
| 880 | free_page((unsigned long) page); |
| 881 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 882 | put_task_struct(task); |
| 883 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | return ret; |
| 885 | } |
| 886 | |
Glauber de Oliveira Costa | 63967fa | 2007-02-20 13:58:12 -0800 | [diff] [blame] | 887 | static ssize_t mem_write(struct file * file, const char __user *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | size_t count, loff_t *ppos) |
| 889 | { |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 890 | int copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | char *page; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 892 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | unsigned long dst = *ppos; |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 894 | struct mm_struct *mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 896 | copied = -ESRCH; |
| 897 | if (!task) |
| 898 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 900 | copied = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 901 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | if (!page) |
KOSAKI Motohiro | 30cd890 | 2011-05-26 16:25:52 -0700 | [diff] [blame] | 903 | goto out_task; |
| 904 | |
| 905 | mm = check_mem_permission(task); |
| 906 | copied = PTR_ERR(mm); |
| 907 | if (IS_ERR(mm)) |
| 908 | goto out_free; |
| 909 | |
| 910 | copied = -EIO; |
| 911 | if (file->private_data != (void *)((long)current->self_exec_id)) |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 912 | goto out_mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 914 | copied = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | while (count > 0) { |
| 916 | int this_len, retval; |
| 917 | |
| 918 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 919 | if (copy_from_user(page, buf, this_len)) { |
| 920 | copied = -EFAULT; |
| 921 | break; |
| 922 | } |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 923 | retval = access_remote_vm(mm, dst, page, this_len, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | if (!retval) { |
| 925 | if (!copied) |
| 926 | copied = -EIO; |
| 927 | break; |
| 928 | } |
| 929 | copied += retval; |
| 930 | buf += retval; |
| 931 | dst += retval; |
| 932 | count -= retval; |
| 933 | } |
| 934 | *ppos = dst; |
KOSAKI Motohiro | 30cd890 | 2011-05-26 16:25:52 -0700 | [diff] [blame] | 935 | |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 936 | out_mm: |
| 937 | mmput(mm); |
KOSAKI Motohiro | 30cd890 | 2011-05-26 16:25:52 -0700 | [diff] [blame] | 938 | out_free: |
| 939 | free_page((unsigned long) page); |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 940 | out_task: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 941 | put_task_struct(task); |
| 942 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | return copied; |
| 944 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 946 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
| 948 | switch (orig) { |
| 949 | case 0: |
| 950 | file->f_pos = offset; |
| 951 | break; |
| 952 | case 1: |
| 953 | file->f_pos += offset; |
| 954 | break; |
| 955 | default: |
| 956 | return -EINVAL; |
| 957 | } |
| 958 | force_successful_syscall_return(); |
| 959 | return file->f_pos; |
| 960 | } |
| 961 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 962 | static const struct file_operations proc_mem_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | .llseek = mem_lseek, |
| 964 | .read = mem_read, |
| 965 | .write = mem_write, |
| 966 | .open = mem_open, |
| 967 | }; |
| 968 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 969 | static ssize_t environ_read(struct file *file, char __user *buf, |
| 970 | size_t count, loff_t *ppos) |
| 971 | { |
| 972 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 973 | char *page; |
| 974 | unsigned long src = *ppos; |
| 975 | int ret = -ESRCH; |
| 976 | struct mm_struct *mm; |
| 977 | |
| 978 | if (!task) |
| 979 | goto out_no_task; |
| 980 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 981 | ret = -ENOMEM; |
| 982 | page = (char *)__get_free_page(GFP_TEMPORARY); |
| 983 | if (!page) |
| 984 | goto out; |
| 985 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 986 | |
Al Viro | d6f64b8 | 2011-02-15 22:26:01 -0500 | [diff] [blame] | 987 | mm = mm_for_maps(task); |
| 988 | ret = PTR_ERR(mm); |
| 989 | if (!mm || IS_ERR(mm)) |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 990 | goto out_free; |
| 991 | |
Al Viro | d6f64b8 | 2011-02-15 22:26:01 -0500 | [diff] [blame] | 992 | ret = 0; |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 993 | while (count > 0) { |
| 994 | int this_len, retval, max_len; |
| 995 | |
| 996 | this_len = mm->env_end - (mm->env_start + src); |
| 997 | |
| 998 | if (this_len <= 0) |
| 999 | break; |
| 1000 | |
| 1001 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 1002 | this_len = (this_len > max_len) ? max_len : this_len; |
| 1003 | |
| 1004 | retval = access_process_vm(task, (mm->env_start + src), |
| 1005 | page, this_len, 0); |
| 1006 | |
| 1007 | if (retval <= 0) { |
| 1008 | ret = retval; |
| 1009 | break; |
| 1010 | } |
| 1011 | |
| 1012 | if (copy_to_user(buf, page, retval)) { |
| 1013 | ret = -EFAULT; |
| 1014 | break; |
| 1015 | } |
| 1016 | |
| 1017 | ret += retval; |
| 1018 | src += retval; |
| 1019 | buf += retval; |
| 1020 | count -= retval; |
| 1021 | } |
| 1022 | *ppos = src; |
| 1023 | |
| 1024 | mmput(mm); |
| 1025 | out_free: |
| 1026 | free_page((unsigned long) page); |
| 1027 | out: |
| 1028 | put_task_struct(task); |
| 1029 | out_no_task: |
| 1030 | return ret; |
| 1031 | } |
| 1032 | |
| 1033 | static const struct file_operations proc_environ_operations = { |
| 1034 | .read = environ_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1035 | .llseek = generic_file_llseek, |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 1036 | }; |
| 1037 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
| 1039 | size_t count, loff_t *ppos) |
| 1040 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1041 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1042 | char buffer[PROC_NUMBUF]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | size_t len; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1044 | int oom_adjust = OOM_DISABLE; |
| 1045 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1047 | if (!task) |
| 1048 | return -ESRCH; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1049 | |
| 1050 | if (lock_task_sighand(task, &flags)) { |
| 1051 | oom_adjust = task->signal->oom_adj; |
| 1052 | unlock_task_sighand(task, &flags); |
| 1053 | } |
| 1054 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1055 | put_task_struct(task); |
| 1056 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1057 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1058 | |
| 1059 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | } |
| 1061 | |
| 1062 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, |
| 1063 | size_t count, loff_t *ppos) |
| 1064 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1065 | struct task_struct *task; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1066 | char buffer[PROC_NUMBUF]; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1067 | int oom_adjust; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1068 | unsigned long flags; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1069 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1071 | memset(buffer, 0, sizeof(buffer)); |
| 1072 | if (count > sizeof(buffer) - 1) |
| 1073 | count = sizeof(buffer) - 1; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1074 | if (copy_from_user(buffer, buf, count)) { |
| 1075 | err = -EFAULT; |
| 1076 | goto out; |
| 1077 | } |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1078 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1079 | err = kstrtoint(strstrip(buffer), 0, &oom_adjust); |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1080 | if (err) |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1081 | goto out; |
Alexey Dobriyan | 8ac773b | 2006-10-19 23:28:32 -0700 | [diff] [blame] | 1082 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1083 | oom_adjust != OOM_DISABLE) { |
| 1084 | err = -EINVAL; |
| 1085 | goto out; |
| 1086 | } |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1087 | |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1088 | task = get_proc_task(file->f_path.dentry->d_inode); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1089 | if (!task) { |
| 1090 | err = -ESRCH; |
| 1091 | goto out; |
| 1092 | } |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1093 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1094 | task_lock(task); |
| 1095 | if (!task->mm) { |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1096 | err = -EINVAL; |
| 1097 | goto err_task_lock; |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1100 | if (!lock_task_sighand(task, &flags)) { |
| 1101 | err = -ESRCH; |
| 1102 | goto err_task_lock; |
| 1103 | } |
| 1104 | |
| 1105 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { |
| 1106 | err = -EACCES; |
| 1107 | goto err_sighand; |
| 1108 | } |
| 1109 | |
David Rientjes | 51b1bd2 | 2010-08-09 17:19:47 -0700 | [diff] [blame] | 1110 | /* |
| 1111 | * Warn that /proc/pid/oom_adj is deprecated, see |
| 1112 | * Documentation/feature-removal-schedule.txt. |
| 1113 | */ |
Linus Torvalds | c214270 | 2011-08-06 11:43:08 -0700 | [diff] [blame] | 1114 | printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", |
David Rientjes | be8f684 | 2011-07-25 17:12:18 -0700 | [diff] [blame] | 1115 | current->comm, task_pid_nr(current), task_pid_nr(task), |
| 1116 | task_pid_nr(task)); |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1117 | task->signal->oom_adj = oom_adjust; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1118 | /* |
| 1119 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum |
| 1120 | * value is always attainable. |
| 1121 | */ |
| 1122 | if (task->signal->oom_adj == OOM_ADJUST_MAX) |
| 1123 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; |
| 1124 | else |
| 1125 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / |
| 1126 | -OOM_DISABLE; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1127 | err_sighand: |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1128 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1129 | err_task_lock: |
| 1130 | task_unlock(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1131 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1132 | out: |
| 1133 | return err < 0 ? err : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | } |
| 1135 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1136 | static const struct file_operations proc_oom_adjust_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | .read = oom_adjust_read, |
| 1138 | .write = oom_adjust_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1139 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | }; |
| 1141 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1142 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
| 1143 | size_t count, loff_t *ppos) |
| 1144 | { |
| 1145 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
| 1146 | char buffer[PROC_NUMBUF]; |
| 1147 | int oom_score_adj = OOM_SCORE_ADJ_MIN; |
| 1148 | unsigned long flags; |
| 1149 | size_t len; |
| 1150 | |
| 1151 | if (!task) |
| 1152 | return -ESRCH; |
| 1153 | if (lock_task_sighand(task, &flags)) { |
| 1154 | oom_score_adj = task->signal->oom_score_adj; |
| 1155 | unlock_task_sighand(task, &flags); |
| 1156 | } |
| 1157 | put_task_struct(task); |
| 1158 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); |
| 1159 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 1160 | } |
| 1161 | |
| 1162 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, |
| 1163 | size_t count, loff_t *ppos) |
| 1164 | { |
| 1165 | struct task_struct *task; |
| 1166 | char buffer[PROC_NUMBUF]; |
| 1167 | unsigned long flags; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1168 | int oom_score_adj; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1169 | int err; |
| 1170 | |
| 1171 | memset(buffer, 0, sizeof(buffer)); |
| 1172 | if (count > sizeof(buffer) - 1) |
| 1173 | count = sizeof(buffer) - 1; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1174 | if (copy_from_user(buffer, buf, count)) { |
| 1175 | err = -EFAULT; |
| 1176 | goto out; |
| 1177 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1178 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1179 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1180 | if (err) |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1181 | goto out; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1182 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1183 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
| 1184 | err = -EINVAL; |
| 1185 | goto out; |
| 1186 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1187 | |
| 1188 | task = get_proc_task(file->f_path.dentry->d_inode); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1189 | if (!task) { |
| 1190 | err = -ESRCH; |
| 1191 | goto out; |
| 1192 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1193 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1194 | task_lock(task); |
| 1195 | if (!task->mm) { |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1196 | err = -EINVAL; |
| 1197 | goto err_task_lock; |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1198 | } |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1199 | |
| 1200 | if (!lock_task_sighand(task, &flags)) { |
| 1201 | err = -ESRCH; |
| 1202 | goto err_task_lock; |
| 1203 | } |
| 1204 | |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 1205 | if (oom_score_adj < task->signal->oom_score_adj_min && |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1206 | !capable(CAP_SYS_RESOURCE)) { |
| 1207 | err = -EACCES; |
| 1208 | goto err_sighand; |
| 1209 | } |
| 1210 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1211 | task->signal->oom_score_adj = oom_score_adj; |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 1212 | if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) |
| 1213 | task->signal->oom_score_adj_min = oom_score_adj; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1214 | /* |
| 1215 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is |
| 1216 | * always attainable. |
| 1217 | */ |
| 1218 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1219 | task->signal->oom_adj = OOM_DISABLE; |
| 1220 | else |
| 1221 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / |
| 1222 | OOM_SCORE_ADJ_MAX; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1223 | err_sighand: |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1224 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1225 | err_task_lock: |
| 1226 | task_unlock(task); |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1227 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1228 | out: |
| 1229 | return err < 0 ? err : count; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1230 | } |
| 1231 | |
| 1232 | static const struct file_operations proc_oom_score_adj_operations = { |
| 1233 | .read = oom_score_adj_read, |
| 1234 | .write = oom_score_adj_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1235 | .llseek = default_llseek, |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1236 | }; |
| 1237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | #ifdef CONFIG_AUDITSYSCALL |
| 1239 | #define TMPBUFLEN 21 |
| 1240 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
| 1241 | size_t count, loff_t *ppos) |
| 1242 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1243 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1244 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | ssize_t length; |
| 1246 | char tmpbuf[TMPBUFLEN]; |
| 1247 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1248 | if (!task) |
| 1249 | return -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
Al Viro | 0c11b94 | 2008-01-10 04:20:52 -0500 | [diff] [blame] | 1251 | audit_get_loginuid(task)); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1252 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1254 | } |
| 1255 | |
| 1256 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, |
| 1257 | size_t count, loff_t *ppos) |
| 1258 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1259 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | char *page, *tmp; |
| 1261 | ssize_t length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | uid_t loginuid; |
| 1263 | |
| 1264 | if (!capable(CAP_AUDIT_CONTROL)) |
| 1265 | return -EPERM; |
| 1266 | |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1267 | rcu_read_lock(); |
| 1268 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { |
| 1269 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | return -EPERM; |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1271 | } |
| 1272 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1274 | if (count >= PAGE_SIZE) |
| 1275 | count = PAGE_SIZE - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | |
| 1277 | if (*ppos != 0) { |
| 1278 | /* No partial writes. */ |
| 1279 | return -EINVAL; |
| 1280 | } |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1281 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | if (!page) |
| 1283 | return -ENOMEM; |
| 1284 | length = -EFAULT; |
| 1285 | if (copy_from_user(page, buf, count)) |
| 1286 | goto out_free_page; |
| 1287 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1288 | page[count] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | loginuid = simple_strtoul(page, &tmp, 10); |
| 1290 | if (tmp == page) { |
| 1291 | length = -EINVAL; |
| 1292 | goto out_free_page; |
| 1293 | |
| 1294 | } |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1295 | length = audit_set_loginuid(current, loginuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | if (likely(length == 0)) |
| 1297 | length = count; |
| 1298 | |
| 1299 | out_free_page: |
| 1300 | free_page((unsigned long) page); |
| 1301 | return length; |
| 1302 | } |
| 1303 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1304 | static const struct file_operations proc_loginuid_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | .read = proc_loginuid_read, |
| 1306 | .write = proc_loginuid_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1307 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | }; |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1309 | |
| 1310 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, |
| 1311 | size_t count, loff_t *ppos) |
| 1312 | { |
| 1313 | struct inode * inode = file->f_path.dentry->d_inode; |
| 1314 | struct task_struct *task = get_proc_task(inode); |
| 1315 | ssize_t length; |
| 1316 | char tmpbuf[TMPBUFLEN]; |
| 1317 | |
| 1318 | if (!task) |
| 1319 | return -ESRCH; |
| 1320 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| 1321 | audit_get_sessionid(task)); |
| 1322 | put_task_struct(task); |
| 1323 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1324 | } |
| 1325 | |
| 1326 | static const struct file_operations proc_sessionid_operations = { |
| 1327 | .read = proc_sessionid_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1328 | .llseek = generic_file_llseek, |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1329 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | #endif |
| 1331 | |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1332 | #ifdef CONFIG_FAULT_INJECTION |
| 1333 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, |
| 1334 | size_t count, loff_t *ppos) |
| 1335 | { |
| 1336 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 1337 | char buffer[PROC_NUMBUF]; |
| 1338 | size_t len; |
| 1339 | int make_it_fail; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1340 | |
| 1341 | if (!task) |
| 1342 | return -ESRCH; |
| 1343 | make_it_fail = task->make_it_fail; |
| 1344 | put_task_struct(task); |
| 1345 | |
| 1346 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1347 | |
| 1348 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1349 | } |
| 1350 | |
| 1351 | static ssize_t proc_fault_inject_write(struct file * file, |
| 1352 | const char __user * buf, size_t count, loff_t *ppos) |
| 1353 | { |
| 1354 | struct task_struct *task; |
| 1355 | char buffer[PROC_NUMBUF], *end; |
| 1356 | int make_it_fail; |
| 1357 | |
| 1358 | if (!capable(CAP_SYS_RESOURCE)) |
| 1359 | return -EPERM; |
| 1360 | memset(buffer, 0, sizeof(buffer)); |
| 1361 | if (count > sizeof(buffer) - 1) |
| 1362 | count = sizeof(buffer) - 1; |
| 1363 | if (copy_from_user(buffer, buf, count)) |
| 1364 | return -EFAULT; |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1365 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
| 1366 | if (*end) |
| 1367 | return -EINVAL; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1368 | task = get_proc_task(file->f_dentry->d_inode); |
| 1369 | if (!task) |
| 1370 | return -ESRCH; |
| 1371 | task->make_it_fail = make_it_fail; |
| 1372 | put_task_struct(task); |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1373 | |
| 1374 | return count; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1375 | } |
| 1376 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1377 | static const struct file_operations proc_fault_inject_operations = { |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1378 | .read = proc_fault_inject_read, |
| 1379 | .write = proc_fault_inject_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1380 | .llseek = generic_file_llseek, |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1381 | }; |
| 1382 | #endif |
| 1383 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1384 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1385 | #ifdef CONFIG_SCHED_DEBUG |
| 1386 | /* |
| 1387 | * Print out various scheduling related per-task fields: |
| 1388 | */ |
| 1389 | static int sched_show(struct seq_file *m, void *v) |
| 1390 | { |
| 1391 | struct inode *inode = m->private; |
| 1392 | struct task_struct *p; |
| 1393 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1394 | p = get_proc_task(inode); |
| 1395 | if (!p) |
| 1396 | return -ESRCH; |
| 1397 | proc_sched_show_task(p, m); |
| 1398 | |
| 1399 | put_task_struct(p); |
| 1400 | |
| 1401 | return 0; |
| 1402 | } |
| 1403 | |
| 1404 | static ssize_t |
| 1405 | sched_write(struct file *file, const char __user *buf, |
| 1406 | size_t count, loff_t *offset) |
| 1407 | { |
| 1408 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1409 | struct task_struct *p; |
| 1410 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1411 | p = get_proc_task(inode); |
| 1412 | if (!p) |
| 1413 | return -ESRCH; |
| 1414 | proc_sched_set_task(p); |
| 1415 | |
| 1416 | put_task_struct(p); |
| 1417 | |
| 1418 | return count; |
| 1419 | } |
| 1420 | |
| 1421 | static int sched_open(struct inode *inode, struct file *filp) |
| 1422 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 1423 | return single_open(filp, sched_show, inode); |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1424 | } |
| 1425 | |
| 1426 | static const struct file_operations proc_pid_sched_operations = { |
| 1427 | .open = sched_open, |
| 1428 | .read = seq_read, |
| 1429 | .write = sched_write, |
| 1430 | .llseek = seq_lseek, |
Alexey Dobriyan | 5ea473a | 2007-07-31 00:38:50 -0700 | [diff] [blame] | 1431 | .release = single_release, |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1432 | }; |
| 1433 | |
| 1434 | #endif |
| 1435 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1436 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 1437 | /* |
| 1438 | * Print out autogroup related information: |
| 1439 | */ |
| 1440 | static int sched_autogroup_show(struct seq_file *m, void *v) |
| 1441 | { |
| 1442 | struct inode *inode = m->private; |
| 1443 | struct task_struct *p; |
| 1444 | |
| 1445 | p = get_proc_task(inode); |
| 1446 | if (!p) |
| 1447 | return -ESRCH; |
| 1448 | proc_sched_autogroup_show_task(p, m); |
| 1449 | |
| 1450 | put_task_struct(p); |
| 1451 | |
| 1452 | return 0; |
| 1453 | } |
| 1454 | |
| 1455 | static ssize_t |
| 1456 | sched_autogroup_write(struct file *file, const char __user *buf, |
| 1457 | size_t count, loff_t *offset) |
| 1458 | { |
| 1459 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1460 | struct task_struct *p; |
| 1461 | char buffer[PROC_NUMBUF]; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1462 | int nice; |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1463 | int err; |
| 1464 | |
| 1465 | memset(buffer, 0, sizeof(buffer)); |
| 1466 | if (count > sizeof(buffer) - 1) |
| 1467 | count = sizeof(buffer) - 1; |
| 1468 | if (copy_from_user(buffer, buf, count)) |
| 1469 | return -EFAULT; |
| 1470 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1471 | err = kstrtoint(strstrip(buffer), 0, &nice); |
| 1472 | if (err < 0) |
| 1473 | return err; |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1474 | |
| 1475 | p = get_proc_task(inode); |
| 1476 | if (!p) |
| 1477 | return -ESRCH; |
| 1478 | |
| 1479 | err = nice; |
| 1480 | err = proc_sched_autogroup_set_nice(p, &err); |
| 1481 | if (err) |
| 1482 | count = err; |
| 1483 | |
| 1484 | put_task_struct(p); |
| 1485 | |
| 1486 | return count; |
| 1487 | } |
| 1488 | |
| 1489 | static int sched_autogroup_open(struct inode *inode, struct file *filp) |
| 1490 | { |
| 1491 | int ret; |
| 1492 | |
| 1493 | ret = single_open(filp, sched_autogroup_show, NULL); |
| 1494 | if (!ret) { |
| 1495 | struct seq_file *m = filp->private_data; |
| 1496 | |
| 1497 | m->private = inode; |
| 1498 | } |
| 1499 | return ret; |
| 1500 | } |
| 1501 | |
| 1502 | static const struct file_operations proc_pid_sched_autogroup_operations = { |
| 1503 | .open = sched_autogroup_open, |
| 1504 | .read = seq_read, |
| 1505 | .write = sched_autogroup_write, |
| 1506 | .llseek = seq_lseek, |
| 1507 | .release = single_release, |
| 1508 | }; |
| 1509 | |
| 1510 | #endif /* CONFIG_SCHED_AUTOGROUP */ |
| 1511 | |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1512 | static ssize_t comm_write(struct file *file, const char __user *buf, |
| 1513 | size_t count, loff_t *offset) |
| 1514 | { |
| 1515 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1516 | struct task_struct *p; |
| 1517 | char buffer[TASK_COMM_LEN]; |
| 1518 | |
| 1519 | memset(buffer, 0, sizeof(buffer)); |
| 1520 | if (count > sizeof(buffer) - 1) |
| 1521 | count = sizeof(buffer) - 1; |
| 1522 | if (copy_from_user(buffer, buf, count)) |
| 1523 | return -EFAULT; |
| 1524 | |
| 1525 | p = get_proc_task(inode); |
| 1526 | if (!p) |
| 1527 | return -ESRCH; |
| 1528 | |
| 1529 | if (same_thread_group(current, p)) |
| 1530 | set_task_comm(p, buffer); |
| 1531 | else |
| 1532 | count = -EINVAL; |
| 1533 | |
| 1534 | put_task_struct(p); |
| 1535 | |
| 1536 | return count; |
| 1537 | } |
| 1538 | |
| 1539 | static int comm_show(struct seq_file *m, void *v) |
| 1540 | { |
| 1541 | struct inode *inode = m->private; |
| 1542 | struct task_struct *p; |
| 1543 | |
| 1544 | p = get_proc_task(inode); |
| 1545 | if (!p) |
| 1546 | return -ESRCH; |
| 1547 | |
| 1548 | task_lock(p); |
| 1549 | seq_printf(m, "%s\n", p->comm); |
| 1550 | task_unlock(p); |
| 1551 | |
| 1552 | put_task_struct(p); |
| 1553 | |
| 1554 | return 0; |
| 1555 | } |
| 1556 | |
| 1557 | static int comm_open(struct inode *inode, struct file *filp) |
| 1558 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 1559 | return single_open(filp, comm_show, inode); |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1560 | } |
| 1561 | |
| 1562 | static const struct file_operations proc_pid_set_comm_operations = { |
| 1563 | .open = comm_open, |
| 1564 | .read = seq_read, |
| 1565 | .write = comm_write, |
| 1566 | .llseek = seq_lseek, |
| 1567 | .release = single_release, |
| 1568 | }; |
| 1569 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1570 | static int proc_exe_link(struct inode *inode, struct path *exe_path) |
| 1571 | { |
| 1572 | struct task_struct *task; |
| 1573 | struct mm_struct *mm; |
| 1574 | struct file *exe_file; |
| 1575 | |
| 1576 | task = get_proc_task(inode); |
| 1577 | if (!task) |
| 1578 | return -ENOENT; |
| 1579 | mm = get_task_mm(task); |
| 1580 | put_task_struct(task); |
| 1581 | if (!mm) |
| 1582 | return -ENOENT; |
| 1583 | exe_file = get_mm_exe_file(mm); |
| 1584 | mmput(mm); |
| 1585 | if (exe_file) { |
| 1586 | *exe_path = exe_file->f_path; |
| 1587 | path_get(&exe_file->f_path); |
| 1588 | fput(exe_file); |
| 1589 | return 0; |
| 1590 | } else |
| 1591 | return -ENOENT; |
| 1592 | } |
| 1593 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1594 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | { |
| 1596 | struct inode *inode = dentry->d_inode; |
| 1597 | int error = -EACCES; |
| 1598 | |
| 1599 | /* We don't need a base pointer in the /proc filesystem */ |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 1600 | path_put(&nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1602 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1603 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1606 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | out: |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1608 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | } |
| 1610 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1611 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | { |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1613 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1614 | char *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | int len; |
| 1616 | |
| 1617 | if (!tmp) |
| 1618 | return -ENOMEM; |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1619 | |
Eric W. Biederman | 7b2a69b | 2010-12-05 15:51:21 -0800 | [diff] [blame] | 1620 | pathname = d_path(path, tmp, PAGE_SIZE); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1621 | len = PTR_ERR(pathname); |
| 1622 | if (IS_ERR(pathname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | goto out; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1624 | len = tmp + PAGE_SIZE - 1 - pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | |
| 1626 | if (len > buflen) |
| 1627 | len = buflen; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1628 | if (copy_to_user(buffer, pathname, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | len = -EFAULT; |
| 1630 | out: |
| 1631 | free_page((unsigned long)tmp); |
| 1632 | return len; |
| 1633 | } |
| 1634 | |
| 1635 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) |
| 1636 | { |
| 1637 | int error = -EACCES; |
| 1638 | struct inode *inode = dentry->d_inode; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1639 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1641 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1642 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1645 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | if (error) |
| 1647 | goto out; |
| 1648 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1649 | error = do_proc_readlink(&path, buffer, buflen); |
| 1650 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | return error; |
| 1653 | } |
| 1654 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1655 | static const struct inode_operations proc_pid_link_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | .readlink = proc_pid_readlink, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1657 | .follow_link = proc_pid_follow_link, |
| 1658 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | }; |
| 1660 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1661 | |
| 1662 | /* building an inode */ |
| 1663 | |
| 1664 | static int task_dumpable(struct task_struct *task) |
| 1665 | { |
| 1666 | int dumpable = 0; |
| 1667 | struct mm_struct *mm; |
| 1668 | |
| 1669 | task_lock(task); |
| 1670 | mm = task->mm; |
| 1671 | if (mm) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 1672 | dumpable = get_dumpable(mm); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1673 | task_unlock(task); |
| 1674 | if(dumpable == 1) |
| 1675 | return 1; |
| 1676 | return 0; |
| 1677 | } |
| 1678 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1679 | struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1680 | { |
| 1681 | struct inode * inode; |
| 1682 | struct proc_inode *ei; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1683 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1684 | |
| 1685 | /* We need a new inode */ |
| 1686 | |
| 1687 | inode = new_inode(sb); |
| 1688 | if (!inode) |
| 1689 | goto out; |
| 1690 | |
| 1691 | /* Common stuff */ |
| 1692 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 1693 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1694 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1695 | inode->i_op = &proc_def_inode_operations; |
| 1696 | |
| 1697 | /* |
| 1698 | * grab the reference to task. |
| 1699 | */ |
Oleg Nesterov | 1a657f7 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 1700 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1701 | if (!ei->pid) |
| 1702 | goto out_unlock; |
| 1703 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1704 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1705 | rcu_read_lock(); |
| 1706 | cred = __task_cred(task); |
| 1707 | inode->i_uid = cred->euid; |
| 1708 | inode->i_gid = cred->egid; |
| 1709 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1710 | } |
| 1711 | security_task_to_inode(task, inode); |
| 1712 | |
| 1713 | out: |
| 1714 | return inode; |
| 1715 | |
| 1716 | out_unlock: |
| 1717 | iput(inode); |
| 1718 | return NULL; |
| 1719 | } |
| 1720 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1721 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1722 | { |
| 1723 | struct inode *inode = dentry->d_inode; |
| 1724 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1725 | const struct cred *cred; |
| 1726 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1727 | generic_fillattr(inode, stat); |
| 1728 | |
| 1729 | rcu_read_lock(); |
| 1730 | stat->uid = 0; |
| 1731 | stat->gid = 0; |
| 1732 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
| 1733 | if (task) { |
| 1734 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1735 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1736 | cred = __task_cred(task); |
| 1737 | stat->uid = cred->euid; |
| 1738 | stat->gid = cred->egid; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1739 | } |
| 1740 | } |
| 1741 | rcu_read_unlock(); |
| 1742 | return 0; |
| 1743 | } |
| 1744 | |
| 1745 | /* dentry stuff */ |
| 1746 | |
| 1747 | /* |
| 1748 | * Exceptional case: normally we are not allowed to unhash a busy |
| 1749 | * directory. In this case, however, we can do it - no aliasing problems |
| 1750 | * due to the way we treat inodes. |
| 1751 | * |
| 1752 | * Rewrite the inode's ownerships here because the owning task may have |
| 1753 | * performed a setuid(), etc. |
| 1754 | * |
| 1755 | * Before the /proc/pid/status file was created the only way to read |
| 1756 | * the effective uid of a /process was to stat /proc/pid. Reading |
| 1757 | * /proc/pid/status is slow enough that procps and other packages |
| 1758 | * kept stating /proc/pid. To keep the rules in /proc simple I have |
| 1759 | * made this apply to all per process world readable and executable |
| 1760 | * directories. |
| 1761 | */ |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1762 | int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1763 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1764 | struct inode *inode; |
| 1765 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1766 | const struct cred *cred; |
| 1767 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1768 | if (nd && nd->flags & LOOKUP_RCU) |
| 1769 | return -ECHILD; |
| 1770 | |
| 1771 | inode = dentry->d_inode; |
| 1772 | task = get_proc_task(inode); |
| 1773 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1774 | if (task) { |
| 1775 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1776 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1777 | rcu_read_lock(); |
| 1778 | cred = __task_cred(task); |
| 1779 | inode->i_uid = cred->euid; |
| 1780 | inode->i_gid = cred->egid; |
| 1781 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1782 | } else { |
| 1783 | inode->i_uid = 0; |
| 1784 | inode->i_gid = 0; |
| 1785 | } |
| 1786 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1787 | security_task_to_inode(task, inode); |
| 1788 | put_task_struct(task); |
| 1789 | return 1; |
| 1790 | } |
| 1791 | d_drop(dentry); |
| 1792 | return 0; |
| 1793 | } |
| 1794 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 1795 | static int pid_delete_dentry(const struct dentry * dentry) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1796 | { |
| 1797 | /* Is the task we represent dead? |
| 1798 | * If so, then don't put the dentry on the lru list, |
| 1799 | * kill it immediately. |
| 1800 | */ |
| 1801 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; |
| 1802 | } |
| 1803 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1804 | const struct dentry_operations pid_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1805 | { |
| 1806 | .d_revalidate = pid_revalidate, |
| 1807 | .d_delete = pid_delete_dentry, |
| 1808 | }; |
| 1809 | |
| 1810 | /* Lookups */ |
| 1811 | |
Eric W. Biederman | 1c0d04c | 2006-10-02 02:18:57 -0700 | [diff] [blame] | 1812 | /* |
| 1813 | * Fill a directory entry. |
| 1814 | * |
| 1815 | * If possible create the dcache entry and derive our inode number and |
| 1816 | * file type from dcache entry. |
| 1817 | * |
| 1818 | * Since all of the proc inode numbers are dynamically generated, the inode |
| 1819 | * numbers do not exist until the inode is cache. This means creating the |
| 1820 | * the dcache entry in readdir is necessary to keep the inode numbers |
| 1821 | * reported by readdir in sync with the inode numbers reported |
| 1822 | * by stat. |
| 1823 | */ |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1824 | int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 1825 | const char *name, int len, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1826 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1827 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1828 | struct dentry *child, *dir = filp->f_path.dentry; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1829 | struct inode *inode; |
| 1830 | struct qstr qname; |
| 1831 | ino_t ino = 0; |
| 1832 | unsigned type = DT_UNKNOWN; |
| 1833 | |
| 1834 | qname.name = name; |
| 1835 | qname.len = len; |
| 1836 | qname.hash = full_name_hash(name, len); |
| 1837 | |
| 1838 | child = d_lookup(dir, &qname); |
| 1839 | if (!child) { |
| 1840 | struct dentry *new; |
| 1841 | new = d_alloc(dir, &qname); |
| 1842 | if (new) { |
| 1843 | child = instantiate(dir->d_inode, new, task, ptr); |
| 1844 | if (child) |
| 1845 | dput(new); |
| 1846 | else |
| 1847 | child = new; |
| 1848 | } |
| 1849 | } |
| 1850 | if (!child || IS_ERR(child) || !child->d_inode) |
| 1851 | goto end_instantiate; |
| 1852 | inode = child->d_inode; |
| 1853 | if (inode) { |
| 1854 | ino = inode->i_ino; |
| 1855 | type = inode->i_mode >> 12; |
| 1856 | } |
| 1857 | dput(child); |
| 1858 | end_instantiate: |
| 1859 | if (!ino) |
| 1860 | ino = find_inode_number(dir, &qname); |
| 1861 | if (!ino) |
| 1862 | ino = 1; |
| 1863 | return filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1864 | } |
| 1865 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1866 | static unsigned name_to_int(struct dentry *dentry) |
| 1867 | { |
| 1868 | const char *name = dentry->d_name.name; |
| 1869 | int len = dentry->d_name.len; |
| 1870 | unsigned n = 0; |
| 1871 | |
| 1872 | if (len > 1 && *name == '0') |
| 1873 | goto out; |
| 1874 | while (len-- > 0) { |
| 1875 | unsigned c = *name++ - '0'; |
| 1876 | if (c > 9) |
| 1877 | goto out; |
| 1878 | if (n >= (~0U-9)/10) |
| 1879 | goto out; |
| 1880 | n *= 10; |
| 1881 | n += c; |
| 1882 | } |
| 1883 | return n; |
| 1884 | out: |
| 1885 | return ~0U; |
| 1886 | } |
| 1887 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1888 | #define PROC_FDINFO_MAX 64 |
| 1889 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1890 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1891 | { |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1892 | struct task_struct *task = get_proc_task(inode); |
| 1893 | struct files_struct *files = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1894 | struct file *file; |
| 1895 | int fd = proc_fd(inode); |
| 1896 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1897 | if (task) { |
| 1898 | files = get_files_struct(task); |
| 1899 | put_task_struct(task); |
| 1900 | } |
| 1901 | if (files) { |
| 1902 | /* |
| 1903 | * We are not taking a ref to the file structure, so we must |
| 1904 | * hold ->file_lock. |
| 1905 | */ |
| 1906 | spin_lock(&files->file_lock); |
| 1907 | file = fcheck_files(files, fd); |
| 1908 | if (file) { |
| 1909 | unsigned int f_flags; |
| 1910 | struct fdtable *fdt; |
Linus Torvalds | 1117f72 | 2011-08-06 11:51:33 -0700 | [diff] [blame] | 1911 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1912 | fdt = files_fdtable(files); |
| 1913 | f_flags = file->f_flags & ~O_CLOEXEC; |
| 1914 | if (FD_ISSET(fd, fdt->close_on_exec)) |
| 1915 | f_flags |= O_CLOEXEC; |
Linus Torvalds | 1117f72 | 2011-08-06 11:51:33 -0700 | [diff] [blame] | 1916 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1917 | if (path) { |
| 1918 | *path = file->f_path; |
| 1919 | path_get(&file->f_path); |
| 1920 | } |
| 1921 | if (info) |
| 1922 | snprintf(info, PROC_FDINFO_MAX, |
| 1923 | "pos:\t%lli\n" |
| 1924 | "flags:\t0%o\n", |
| 1925 | (long long) file->f_pos, |
| 1926 | f_flags); |
| 1927 | spin_unlock(&files->file_lock); |
| 1928 | put_files_struct(files); |
| 1929 | return 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1930 | } |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1931 | spin_unlock(&files->file_lock); |
| 1932 | put_files_struct(files); |
| 1933 | } |
| 1934 | return -ENOENT; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1935 | } |
| 1936 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1937 | static int proc_fd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1938 | { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1939 | return proc_fd_info(inode, path, NULL); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1940 | } |
| 1941 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1942 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1943 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1944 | struct inode *inode; |
| 1945 | struct task_struct *task; |
| 1946 | int fd; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1947 | struct files_struct *files; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1948 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1949 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1950 | if (nd && nd->flags & LOOKUP_RCU) |
| 1951 | return -ECHILD; |
| 1952 | |
| 1953 | inode = dentry->d_inode; |
| 1954 | task = get_proc_task(inode); |
| 1955 | fd = proc_fd(inode); |
| 1956 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1957 | if (task) { |
| 1958 | files = get_files_struct(task); |
| 1959 | if (files) { |
| 1960 | rcu_read_lock(); |
| 1961 | if (fcheck_files(files, fd)) { |
| 1962 | rcu_read_unlock(); |
| 1963 | put_files_struct(files); |
| 1964 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1965 | rcu_read_lock(); |
| 1966 | cred = __task_cred(task); |
| 1967 | inode->i_uid = cred->euid; |
| 1968 | inode->i_gid = cred->egid; |
| 1969 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1970 | } else { |
| 1971 | inode->i_uid = 0; |
| 1972 | inode->i_gid = 0; |
| 1973 | } |
| 1974 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1975 | security_task_to_inode(task, inode); |
| 1976 | put_task_struct(task); |
| 1977 | return 1; |
| 1978 | } |
| 1979 | rcu_read_unlock(); |
| 1980 | put_files_struct(files); |
| 1981 | } |
| 1982 | put_task_struct(task); |
| 1983 | } |
| 1984 | d_drop(dentry); |
| 1985 | return 0; |
| 1986 | } |
| 1987 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 1988 | static const struct dentry_operations tid_fd_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1989 | { |
| 1990 | .d_revalidate = tid_fd_revalidate, |
| 1991 | .d_delete = pid_delete_dentry, |
| 1992 | }; |
| 1993 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1994 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1995 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1996 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1997 | unsigned fd = *(const unsigned *)ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1998 | struct file *file; |
| 1999 | struct files_struct *files; |
| 2000 | struct inode *inode; |
| 2001 | struct proc_inode *ei; |
| 2002 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2003 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2004 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2005 | if (!inode) |
| 2006 | goto out; |
| 2007 | ei = PROC_I(inode); |
| 2008 | ei->fd = fd; |
| 2009 | files = get_files_struct(task); |
| 2010 | if (!files) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2011 | goto out_iput; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2012 | inode->i_mode = S_IFLNK; |
| 2013 | |
| 2014 | /* |
| 2015 | * We are not taking a ref to the file structure, so we must |
| 2016 | * hold ->file_lock. |
| 2017 | */ |
| 2018 | spin_lock(&files->file_lock); |
| 2019 | file = fcheck_files(files, fd); |
| 2020 | if (!file) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2021 | goto out_unlock; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 2022 | if (file->f_mode & FMODE_READ) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2023 | inode->i_mode |= S_IRUSR | S_IXUSR; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 2024 | if (file->f_mode & FMODE_WRITE) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2025 | inode->i_mode |= S_IWUSR | S_IXUSR; |
| 2026 | spin_unlock(&files->file_lock); |
| 2027 | put_files_struct(files); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2028 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 2029 | inode->i_op = &proc_pid_link_inode_operations; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2030 | inode->i_size = 64; |
| 2031 | ei->op.proc_get_link = proc_fd_link; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2032 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2033 | d_add(dentry, inode); |
| 2034 | /* Close the race of the process dying before we return the dentry */ |
| 2035 | if (tid_fd_revalidate(dentry, NULL)) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2036 | error = NULL; |
| 2037 | |
| 2038 | out: |
| 2039 | return error; |
| 2040 | out_unlock: |
| 2041 | spin_unlock(&files->file_lock); |
| 2042 | put_files_struct(files); |
| 2043 | out_iput: |
| 2044 | iput(inode); |
| 2045 | goto out; |
| 2046 | } |
| 2047 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2048 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
| 2049 | struct dentry *dentry, |
| 2050 | instantiate_t instantiate) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2051 | { |
| 2052 | struct task_struct *task = get_proc_task(dir); |
| 2053 | unsigned fd = name_to_int(dentry); |
| 2054 | struct dentry *result = ERR_PTR(-ENOENT); |
| 2055 | |
| 2056 | if (!task) |
| 2057 | goto out_no_task; |
| 2058 | if (fd == ~0U) |
| 2059 | goto out; |
| 2060 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2061 | result = instantiate(dir, dentry, task, &fd); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2062 | out: |
| 2063 | put_task_struct(task); |
| 2064 | out_no_task: |
| 2065 | return result; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2066 | } |
| 2067 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2068 | static int proc_readfd_common(struct file * filp, void * dirent, |
| 2069 | filldir_t filldir, instantiate_t instantiate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2071 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 2072 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2073 | struct task_struct *p = get_proc_task(inode); |
Pavel Emelyanov | 457c251 | 2007-10-18 23:40:43 -0700 | [diff] [blame] | 2074 | unsigned int fd, ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | struct files_struct * files; |
| 2077 | |
| 2078 | retval = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2079 | if (!p) |
| 2080 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | |
| 2083 | fd = filp->f_pos; |
| 2084 | switch (fd) { |
| 2085 | case 0: |
| 2086 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 2087 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | filp->f_pos++; |
| 2089 | case 1: |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 2090 | ino = parent_ino(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 2092 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | filp->f_pos++; |
| 2094 | default: |
| 2095 | files = get_files_struct(p); |
| 2096 | if (!files) |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 2097 | goto out; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2098 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | for (fd = filp->f_pos-2; |
Al Viro | 9b4f526 | 2008-04-22 01:32:44 -0400 | [diff] [blame] | 2100 | fd < files_fdtable(files)->max_fds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | fd++, filp->f_pos++) { |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2102 | char name[PROC_NUMBUF]; |
| 2103 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | |
| 2105 | if (!fcheck_files(files, fd)) |
| 2106 | continue; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2107 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2109 | len = snprintf(name, sizeof(name), "%d", fd); |
| 2110 | if (proc_fill_cache(filp, dirent, filldir, |
| 2111 | name, len, instantiate, |
| 2112 | p, &fd) < 0) { |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2113 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | break; |
| 2115 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2116 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2118 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | put_files_struct(files); |
| 2120 | } |
| 2121 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2122 | put_task_struct(p); |
| 2123 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | return retval; |
| 2125 | } |
| 2126 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2127 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
| 2128 | struct nameidata *nd) |
| 2129 | { |
| 2130 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); |
| 2131 | } |
| 2132 | |
| 2133 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) |
| 2134 | { |
| 2135 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); |
| 2136 | } |
| 2137 | |
| 2138 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, |
| 2139 | size_t len, loff_t *ppos) |
| 2140 | { |
| 2141 | char tmp[PROC_FDINFO_MAX]; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 2142 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2143 | if (!err) |
| 2144 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); |
| 2145 | return err; |
| 2146 | } |
| 2147 | |
| 2148 | static const struct file_operations proc_fdinfo_file_operations = { |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2149 | .open = nonseekable_open, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2150 | .read = proc_fdinfo_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2151 | .llseek = no_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2152 | }; |
| 2153 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2154 | static const struct file_operations proc_fd_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | .read = generic_read_dir, |
| 2156 | .readdir = proc_readfd, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2157 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | }; |
| 2159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | /* |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2161 | * /proc/pid/fd needs a special permission handler so that a process can still |
| 2162 | * access /proc/self/fd after it has executed a setuid(). |
| 2163 | */ |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 2164 | static int proc_fd_permission(struct inode *inode, int mask) |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2165 | { |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 2166 | int rv = generic_permission(inode, mask); |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2167 | if (rv == 0) |
| 2168 | return 0; |
| 2169 | if (task_pid(current) == proc_pid(inode)) |
| 2170 | rv = 0; |
| 2171 | return rv; |
| 2172 | } |
| 2173 | |
| 2174 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | * proc directories can do almost nothing.. |
| 2176 | */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2177 | static const struct inode_operations proc_fd_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | .lookup = proc_lookupfd, |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2179 | .permission = proc_fd_permission, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2180 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | }; |
| 2182 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2183 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
| 2184 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
| 2185 | { |
| 2186 | unsigned fd = *(unsigned *)ptr; |
| 2187 | struct inode *inode; |
| 2188 | struct proc_inode *ei; |
| 2189 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2190 | |
| 2191 | inode = proc_pid_make_inode(dir->i_sb, task); |
| 2192 | if (!inode) |
| 2193 | goto out; |
| 2194 | ei = PROC_I(inode); |
| 2195 | ei->fd = fd; |
| 2196 | inode->i_mode = S_IFREG | S_IRUSR; |
| 2197 | inode->i_fop = &proc_fdinfo_file_operations; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2198 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2199 | d_add(dentry, inode); |
| 2200 | /* Close the race of the process dying before we return the dentry */ |
| 2201 | if (tid_fd_revalidate(dentry, NULL)) |
| 2202 | error = NULL; |
| 2203 | |
| 2204 | out: |
| 2205 | return error; |
| 2206 | } |
| 2207 | |
| 2208 | static struct dentry *proc_lookupfdinfo(struct inode *dir, |
| 2209 | struct dentry *dentry, |
| 2210 | struct nameidata *nd) |
| 2211 | { |
| 2212 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); |
| 2213 | } |
| 2214 | |
| 2215 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) |
| 2216 | { |
| 2217 | return proc_readfd_common(filp, dirent, filldir, |
| 2218 | proc_fdinfo_instantiate); |
| 2219 | } |
| 2220 | |
| 2221 | static const struct file_operations proc_fdinfo_operations = { |
| 2222 | .read = generic_read_dir, |
| 2223 | .readdir = proc_readfdinfo, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2224 | .llseek = default_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2225 | }; |
| 2226 | |
| 2227 | /* |
| 2228 | * proc directories can do almost nothing.. |
| 2229 | */ |
| 2230 | static const struct inode_operations proc_fdinfo_inode_operations = { |
| 2231 | .lookup = proc_lookupfdinfo, |
| 2232 | .setattr = proc_setattr, |
| 2233 | }; |
| 2234 | |
| 2235 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2236 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2237 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2238 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2239 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2240 | struct inode *inode; |
| 2241 | struct proc_inode *ei; |
KOSAKI Motohiro | bd6daba | 2009-05-28 14:34:21 -0700 | [diff] [blame] | 2242 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2243 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2244 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2245 | if (!inode) |
| 2246 | goto out; |
| 2247 | |
| 2248 | ei = PROC_I(inode); |
| 2249 | inode->i_mode = p->mode; |
| 2250 | if (S_ISDIR(inode->i_mode)) |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2251 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2252 | if (p->iop) |
| 2253 | inode->i_op = p->iop; |
| 2254 | if (p->fop) |
| 2255 | inode->i_fop = p->fop; |
| 2256 | ei->op = p->op; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2257 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2258 | d_add(dentry, inode); |
| 2259 | /* Close the race of the process dying before we return the dentry */ |
| 2260 | if (pid_revalidate(dentry, NULL)) |
| 2261 | error = NULL; |
| 2262 | out: |
| 2263 | return error; |
| 2264 | } |
| 2265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | static struct dentry *proc_pident_lookup(struct inode *dir, |
| 2267 | struct dentry *dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2268 | const struct pid_entry *ents, |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2269 | unsigned int nents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2271 | struct dentry *error; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2272 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2273 | const struct pid_entry *p, *last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2275 | error = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2276 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2277 | if (!task) |
| 2278 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2280 | /* |
| 2281 | * Yes, it does not scale. And it should not. Don't add |
| 2282 | * new entries into /proc/<tgid>/ without very good reasons. |
| 2283 | */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2284 | last = &ents[nents - 1]; |
| 2285 | for (p = ents; p <= last; p++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2286 | if (p->len != dentry->d_name.len) |
| 2287 | continue; |
| 2288 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2289 | break; |
| 2290 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2291 | if (p > last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | goto out; |
| 2293 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2294 | error = proc_pident_instantiate(dir, dentry, task, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2296 | put_task_struct(task); |
| 2297 | out_no_task: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2298 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | } |
| 2300 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2301 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
| 2302 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2303 | { |
| 2304 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2305 | proc_pident_instantiate, task, p); |
| 2306 | } |
| 2307 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2308 | static int proc_pident_readdir(struct file *filp, |
| 2309 | void *dirent, filldir_t filldir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2310 | const struct pid_entry *ents, unsigned int nents) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2311 | { |
| 2312 | int i; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2313 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2314 | struct inode *inode = dentry->d_inode; |
| 2315 | struct task_struct *task = get_proc_task(inode); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2316 | const struct pid_entry *p, *last; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2317 | ino_t ino; |
| 2318 | int ret; |
| 2319 | |
| 2320 | ret = -ENOENT; |
| 2321 | if (!task) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2322 | goto out_no_task; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2323 | |
| 2324 | ret = 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2325 | i = filp->f_pos; |
| 2326 | switch (i) { |
| 2327 | case 0: |
| 2328 | ino = inode->i_ino; |
| 2329 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| 2330 | goto out; |
| 2331 | i++; |
| 2332 | filp->f_pos++; |
| 2333 | /* fall through */ |
| 2334 | case 1: |
| 2335 | ino = parent_ino(dentry); |
| 2336 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| 2337 | goto out; |
| 2338 | i++; |
| 2339 | filp->f_pos++; |
| 2340 | /* fall through */ |
| 2341 | default: |
| 2342 | i -= 2; |
| 2343 | if (i >= nents) { |
| 2344 | ret = 1; |
| 2345 | goto out; |
| 2346 | } |
| 2347 | p = ents + i; |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2348 | last = &ents[nents - 1]; |
| 2349 | while (p <= last) { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2350 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2351 | goto out; |
| 2352 | filp->f_pos++; |
| 2353 | p++; |
| 2354 | } |
| 2355 | } |
| 2356 | |
| 2357 | ret = 1; |
| 2358 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2359 | put_task_struct(task); |
| 2360 | out_no_task: |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2361 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2362 | } |
| 2363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | #ifdef CONFIG_SECURITY |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2365 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, |
| 2366 | size_t count, loff_t *ppos) |
| 2367 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2368 | struct inode * inode = file->f_path.dentry->d_inode; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2369 | char *p = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2370 | ssize_t length; |
| 2371 | struct task_struct *task = get_proc_task(inode); |
| 2372 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2373 | if (!task) |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2374 | return -ESRCH; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2375 | |
| 2376 | length = security_getprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2377 | (char*)file->f_path.dentry->d_name.name, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2378 | &p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2379 | put_task_struct(task); |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2380 | if (length > 0) |
| 2381 | length = simple_read_from_buffer(buf, count, ppos, p, length); |
| 2382 | kfree(p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2383 | return length; |
| 2384 | } |
| 2385 | |
| 2386 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| 2387 | size_t count, loff_t *ppos) |
| 2388 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2389 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2390 | char *page; |
| 2391 | ssize_t length; |
| 2392 | struct task_struct *task = get_proc_task(inode); |
| 2393 | |
| 2394 | length = -ESRCH; |
| 2395 | if (!task) |
| 2396 | goto out_no_task; |
| 2397 | if (count > PAGE_SIZE) |
| 2398 | count = PAGE_SIZE; |
| 2399 | |
| 2400 | /* No partial writes. */ |
| 2401 | length = -EINVAL; |
| 2402 | if (*ppos != 0) |
| 2403 | goto out; |
| 2404 | |
| 2405 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 2406 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2407 | if (!page) |
| 2408 | goto out; |
| 2409 | |
| 2410 | length = -EFAULT; |
| 2411 | if (copy_from_user(page, buf, count)) |
| 2412 | goto out_free; |
| 2413 | |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2414 | /* Guard against adverse ptrace interaction */ |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2415 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2416 | if (length < 0) |
| 2417 | goto out_free; |
| 2418 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2419 | length = security_setprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2420 | (char*)file->f_path.dentry->d_name.name, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2421 | (void*)page, count); |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2422 | mutex_unlock(&task->signal->cred_guard_mutex); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2423 | out_free: |
| 2424 | free_page((unsigned long) page); |
| 2425 | out: |
| 2426 | put_task_struct(task); |
| 2427 | out_no_task: |
| 2428 | return length; |
| 2429 | } |
| 2430 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2431 | static const struct file_operations proc_pid_attr_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2432 | .read = proc_pid_attr_read, |
| 2433 | .write = proc_pid_attr_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2434 | .llseek = generic_file_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2435 | }; |
| 2436 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2437 | static const struct pid_entry attr_dir_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2438 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2439 | REG("prev", S_IRUGO, proc_pid_attr_operations), |
| 2440 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2441 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2442 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2443 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2444 | }; |
| 2445 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2446 | static int proc_attr_dir_readdir(struct file * filp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | void * dirent, filldir_t filldir) |
| 2448 | { |
| 2449 | return proc_pident_readdir(filp,dirent,filldir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2450 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | } |
| 2452 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2453 | static const struct file_operations proc_attr_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | .read = generic_read_dir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2455 | .readdir = proc_attr_dir_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2456 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | }; |
| 2458 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2459 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | struct dentry *dentry, struct nameidata *nd) |
| 2461 | { |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2462 | return proc_pident_lookup(dir, dentry, |
| 2463 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | } |
| 2465 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2466 | static const struct inode_operations proc_attr_dir_inode_operations = { |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2467 | .lookup = proc_attr_dir_lookup, |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2468 | .getattr = pid_getattr, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2469 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | }; |
| 2471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | #endif |
| 2473 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2474 | #ifdef CONFIG_ELF_CORE |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2475 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
| 2476 | size_t count, loff_t *ppos) |
| 2477 | { |
| 2478 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 2479 | struct mm_struct *mm; |
| 2480 | char buffer[PROC_NUMBUF]; |
| 2481 | size_t len; |
| 2482 | int ret; |
| 2483 | |
| 2484 | if (!task) |
| 2485 | return -ESRCH; |
| 2486 | |
| 2487 | ret = 0; |
| 2488 | mm = get_task_mm(task); |
| 2489 | if (mm) { |
| 2490 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", |
| 2491 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> |
| 2492 | MMF_DUMP_FILTER_SHIFT)); |
| 2493 | mmput(mm); |
| 2494 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 2495 | } |
| 2496 | |
| 2497 | put_task_struct(task); |
| 2498 | |
| 2499 | return ret; |
| 2500 | } |
| 2501 | |
| 2502 | static ssize_t proc_coredump_filter_write(struct file *file, |
| 2503 | const char __user *buf, |
| 2504 | size_t count, |
| 2505 | loff_t *ppos) |
| 2506 | { |
| 2507 | struct task_struct *task; |
| 2508 | struct mm_struct *mm; |
| 2509 | char buffer[PROC_NUMBUF], *end; |
| 2510 | unsigned int val; |
| 2511 | int ret; |
| 2512 | int i; |
| 2513 | unsigned long mask; |
| 2514 | |
| 2515 | ret = -EFAULT; |
| 2516 | memset(buffer, 0, sizeof(buffer)); |
| 2517 | if (count > sizeof(buffer) - 1) |
| 2518 | count = sizeof(buffer) - 1; |
| 2519 | if (copy_from_user(buffer, buf, count)) |
| 2520 | goto out_no_task; |
| 2521 | |
| 2522 | ret = -EINVAL; |
| 2523 | val = (unsigned int)simple_strtoul(buffer, &end, 0); |
| 2524 | if (*end == '\n') |
| 2525 | end++; |
| 2526 | if (end - buffer == 0) |
| 2527 | goto out_no_task; |
| 2528 | |
| 2529 | ret = -ESRCH; |
| 2530 | task = get_proc_task(file->f_dentry->d_inode); |
| 2531 | if (!task) |
| 2532 | goto out_no_task; |
| 2533 | |
| 2534 | ret = end - buffer; |
| 2535 | mm = get_task_mm(task); |
| 2536 | if (!mm) |
| 2537 | goto out_no_mm; |
| 2538 | |
| 2539 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { |
| 2540 | if (val & mask) |
| 2541 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2542 | else |
| 2543 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2544 | } |
| 2545 | |
| 2546 | mmput(mm); |
| 2547 | out_no_mm: |
| 2548 | put_task_struct(task); |
| 2549 | out_no_task: |
| 2550 | return ret; |
| 2551 | } |
| 2552 | |
| 2553 | static const struct file_operations proc_coredump_filter_operations = { |
| 2554 | .read = proc_coredump_filter_read, |
| 2555 | .write = proc_coredump_filter_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2556 | .llseek = generic_file_llseek, |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2557 | }; |
| 2558 | #endif |
| 2559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2560 | /* |
| 2561 | * /proc/self: |
| 2562 | */ |
| 2563 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| 2564 | int buflen) |
| 2565 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2566 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2567 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2568 | char tmp[PROC_NUMBUF]; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2569 | if (!tgid) |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2570 | return -ENOENT; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2571 | sprintf(tmp, "%d", tgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2572 | return vfs_readlink(dentry,buffer,buflen,tmp); |
| 2573 | } |
| 2574 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 2575 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2576 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2577 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2578 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2579 | char *name = ERR_PTR(-ENOENT); |
| 2580 | if (tgid) { |
| 2581 | name = __getname(); |
| 2582 | if (!name) |
| 2583 | name = ERR_PTR(-ENOMEM); |
| 2584 | else |
| 2585 | sprintf(name, "%d", tgid); |
| 2586 | } |
| 2587 | nd_set_link(nd, name); |
| 2588 | return NULL; |
| 2589 | } |
| 2590 | |
| 2591 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, |
| 2592 | void *cookie) |
| 2593 | { |
| 2594 | char *s = nd_get_link(nd); |
| 2595 | if (!IS_ERR(s)) |
| 2596 | __putname(s); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2597 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2598 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2599 | static const struct inode_operations proc_self_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2600 | .readlink = proc_self_readlink, |
| 2601 | .follow_link = proc_self_follow_link, |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2602 | .put_link = proc_self_put_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | }; |
| 2604 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2605 | /* |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2606 | * proc base |
| 2607 | * |
| 2608 | * These are the directory entries in the root directory of /proc |
| 2609 | * that properly belong to the /proc filesystem, as they describe |
| 2610 | * describe something that is process related. |
| 2611 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2612 | static const struct pid_entry proc_base_stuff[] = { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2613 | NOD("self", S_IFLNK|S_IRWXUGO, |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2614 | &proc_self_inode_operations, NULL, {}), |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2615 | }; |
| 2616 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2617 | static struct dentry *proc_base_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2618 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2619 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2620 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2621 | struct inode *inode; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2622 | struct proc_inode *ei; |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 2623 | struct dentry *error; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2624 | |
| 2625 | /* Allocate the inode */ |
| 2626 | error = ERR_PTR(-ENOMEM); |
| 2627 | inode = new_inode(dir->i_sb); |
| 2628 | if (!inode) |
| 2629 | goto out; |
| 2630 | |
| 2631 | /* Initialize the inode */ |
| 2632 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 2633 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2634 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2635 | |
| 2636 | /* |
| 2637 | * grab the reference to the task. |
| 2638 | */ |
Oleg Nesterov | 1a657f7 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 2639 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2640 | if (!ei->pid) |
| 2641 | goto out_iput; |
| 2642 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2643 | inode->i_mode = p->mode; |
| 2644 | if (S_ISDIR(inode->i_mode)) |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2645 | set_nlink(inode, 2); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2646 | if (S_ISLNK(inode->i_mode)) |
| 2647 | inode->i_size = 64; |
| 2648 | if (p->iop) |
| 2649 | inode->i_op = p->iop; |
| 2650 | if (p->fop) |
| 2651 | inode->i_fop = p->fop; |
| 2652 | ei->op = p->op; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2653 | d_add(dentry, inode); |
| 2654 | error = NULL; |
| 2655 | out: |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2656 | return error; |
| 2657 | out_iput: |
| 2658 | iput(inode); |
| 2659 | goto out; |
| 2660 | } |
| 2661 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2662 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
| 2663 | { |
| 2664 | struct dentry *error; |
| 2665 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2666 | const struct pid_entry *p, *last; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2667 | |
| 2668 | error = ERR_PTR(-ENOENT); |
| 2669 | |
| 2670 | if (!task) |
| 2671 | goto out_no_task; |
| 2672 | |
| 2673 | /* Lookup the directory entry */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2674 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
| 2675 | for (p = proc_base_stuff; p <= last; p++) { |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2676 | if (p->len != dentry->d_name.len) |
| 2677 | continue; |
| 2678 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2679 | break; |
| 2680 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2681 | if (p > last) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2682 | goto out; |
| 2683 | |
| 2684 | error = proc_base_instantiate(dir, dentry, task, p); |
| 2685 | |
| 2686 | out: |
| 2687 | put_task_struct(task); |
| 2688 | out_no_task: |
| 2689 | return error; |
| 2690 | } |
| 2691 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2692 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
| 2693 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2694 | { |
| 2695 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2696 | proc_base_instantiate, task, p); |
| 2697 | } |
| 2698 | |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2699 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2700 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2701 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2702 | struct task_io_accounting acct = task->ioac; |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2703 | unsigned long flags; |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2704 | int result; |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2705 | |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2706 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
| 2707 | if (result) |
| 2708 | return result; |
| 2709 | |
| 2710 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) { |
| 2711 | result = -EACCES; |
| 2712 | goto out_unlock; |
| 2713 | } |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 2714 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2715 | if (whole && lock_task_sighand(task, &flags)) { |
| 2716 | struct task_struct *t = task; |
Andrea Righi | b2d002d | 2008-07-26 15:22:27 -0700 | [diff] [blame] | 2717 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2718 | task_io_accounting_add(&acct, &task->signal->ioac); |
| 2719 | while_each_thread(task, t) |
| 2720 | task_io_accounting_add(&acct, &t->ioac); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2721 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2722 | unlock_task_sighand(task, &flags); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2723 | } |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2724 | result = sprintf(buffer, |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2725 | "rchar: %llu\n" |
| 2726 | "wchar: %llu\n" |
| 2727 | "syscr: %llu\n" |
| 2728 | "syscw: %llu\n" |
| 2729 | "read_bytes: %llu\n" |
| 2730 | "write_bytes: %llu\n" |
| 2731 | "cancelled_write_bytes: %llu\n", |
Alexander Beregalov | 7c44319 | 2008-08-05 13:01:34 -0700 | [diff] [blame] | 2732 | (unsigned long long)acct.rchar, |
| 2733 | (unsigned long long)acct.wchar, |
| 2734 | (unsigned long long)acct.syscr, |
| 2735 | (unsigned long long)acct.syscw, |
| 2736 | (unsigned long long)acct.read_bytes, |
| 2737 | (unsigned long long)acct.write_bytes, |
| 2738 | (unsigned long long)acct.cancelled_write_bytes); |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2739 | out_unlock: |
| 2740 | mutex_unlock(&task->signal->cred_guard_mutex); |
| 2741 | return result; |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2742 | } |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2743 | |
| 2744 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) |
| 2745 | { |
| 2746 | return do_io_accounting(task, buffer, 0); |
| 2747 | } |
| 2748 | |
| 2749 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) |
| 2750 | { |
| 2751 | return do_io_accounting(task, buffer, 1); |
| 2752 | } |
| 2753 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2754 | |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2755 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
| 2756 | struct pid *pid, struct task_struct *task) |
| 2757 | { |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2758 | int err = lock_trace(task); |
| 2759 | if (!err) { |
| 2760 | seq_printf(m, "%08x\n", task->personality); |
| 2761 | unlock_trace(task); |
| 2762 | } |
| 2763 | return err; |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2764 | } |
| 2765 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2766 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2767 | * Thread groups |
| 2768 | */ |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2769 | static const struct file_operations proc_task_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2770 | static const struct inode_operations proc_task_inode_operations; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2771 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2772 | static const struct pid_entry tgid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2773 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
| 2774 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2775 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 2776 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
Andrew Morton | b2211a3 | 2008-03-11 18:03:35 -0700 | [diff] [blame] | 2777 | #ifdef CONFIG_NET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2778 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
Andrew Morton | b2211a3 | 2008-03-11 18:03:35 -0700 | [diff] [blame] | 2779 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2780 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2781 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2782 | ONE("status", S_IRUGO, proc_pid_status), |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2783 | ONE("personality", S_IRUGO, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 2784 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2785 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2786 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2787 | #endif |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 2788 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 2789 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), |
| 2790 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 2791 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2792 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2793 | INF("syscall", S_IRUGO, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2794 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2795 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2796 | ONE("stat", S_IRUGO, proc_tgid_stat), |
| 2797 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2798 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2799 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2800 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2801 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2802 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2803 | LNK("cwd", proc_cwd_link), |
| 2804 | LNK("root", proc_root_link), |
| 2805 | LNK("exe", proc_exe_link), |
| 2806 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2807 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
| 2808 | REG("mountstats", S_IRUSR, proc_mountstats_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2809 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2810 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2811 | REG("smaps", S_IRUGO, proc_smaps_operations), |
Al Viro | ca6b0bf | 2011-02-15 22:04:37 -0500 | [diff] [blame] | 2812 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2813 | #endif |
| 2814 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2815 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2816 | #endif |
| 2817 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2818 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2819 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2820 | #ifdef CONFIG_STACKTRACE |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2821 | ONE("stack", S_IRUGO, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2822 | #endif |
| 2823 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2824 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2825 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2826 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2827 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2828 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2829 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2830 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2831 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2832 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2833 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2834 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2835 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2836 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 2837 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2838 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2839 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2840 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2841 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2842 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2843 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2844 | #endif |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2845 | #ifdef CONFIG_ELF_CORE |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2846 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2847 | #endif |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2848 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 2849 | INF("io", S_IRUSR, proc_tgid_io_accounting), |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2850 | #endif |
Chris Metcalf | f133ecc | 2011-05-26 12:40:09 -0400 | [diff] [blame] | 2851 | #ifdef CONFIG_HARDWALL |
| 2852 | INF("hardwall", S_IRUGO, proc_pid_hardwall), |
| 2853 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2854 | }; |
| 2855 | |
| 2856 | static int proc_tgid_base_readdir(struct file * filp, |
| 2857 | void * dirent, filldir_t filldir) |
| 2858 | { |
| 2859 | return proc_pident_readdir(filp,dirent,filldir, |
| 2860 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
| 2861 | } |
| 2862 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2863 | static const struct file_operations proc_tgid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2864 | .read = generic_read_dir, |
| 2865 | .readdir = proc_tgid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2866 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2867 | }; |
| 2868 | |
| 2869 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2870 | return proc_pident_lookup(dir, dentry, |
| 2871 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2872 | } |
| 2873 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2874 | static const struct inode_operations proc_tgid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2875 | .lookup = proc_tgid_base_lookup, |
| 2876 | .getattr = pid_getattr, |
| 2877 | .setattr = proc_setattr, |
| 2878 | }; |
| 2879 | |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2880 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2881 | { |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2882 | struct dentry *dentry, *leader, *dir; |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2883 | char buf[PROC_NUMBUF]; |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2884 | struct qstr name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2886 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2887 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| 2888 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2889 | if (dentry) { |
Sukadev Bhattiprolu | 29f12ca | 2009-11-11 14:26:32 -0800 | [diff] [blame] | 2890 | shrink_dcache_parent(dentry); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2891 | d_drop(dentry); |
| 2892 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2893 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2895 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2896 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
| 2897 | leader = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2898 | if (!leader) |
| 2899 | goto out; |
| 2900 | |
| 2901 | name.name = "task"; |
| 2902 | name.len = strlen(name.name); |
| 2903 | dir = d_hash_and_lookup(leader, &name); |
| 2904 | if (!dir) |
| 2905 | goto out_put_leader; |
| 2906 | |
| 2907 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2908 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2909 | dentry = d_hash_and_lookup(dir, &name); |
| 2910 | if (dentry) { |
| 2911 | shrink_dcache_parent(dentry); |
| 2912 | d_drop(dentry); |
| 2913 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2914 | } |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2915 | |
| 2916 | dput(dir); |
| 2917 | out_put_leader: |
| 2918 | dput(leader); |
| 2919 | out: |
| 2920 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | } |
| 2922 | |
Randy Dunlap | 0895e91 | 2007-10-21 21:00:10 -0700 | [diff] [blame] | 2923 | /** |
| 2924 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| 2925 | * @task: task that should be flushed. |
| 2926 | * |
| 2927 | * When flushing dentries from proc, one needs to flush them from global |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2928 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
Randy Dunlap | 0895e91 | 2007-10-21 21:00:10 -0700 | [diff] [blame] | 2929 | * in. This call is supposed to do all of this job. |
| 2930 | * |
| 2931 | * Looks in the dcache for |
| 2932 | * /proc/@pid |
| 2933 | * /proc/@tgid/task/@pid |
| 2934 | * if either directory is present flushes it and all of it'ts children |
| 2935 | * from the dcache. |
| 2936 | * |
| 2937 | * It is safe and reasonable to cache /proc entries for a task until |
| 2938 | * that task exits. After that they just clog up the dcache with |
| 2939 | * useless entries, possibly causing useful dcache entries to be |
| 2940 | * flushed instead. This routine is proved to flush those useless |
| 2941 | * dcache entries at process exit time. |
| 2942 | * |
| 2943 | * NOTE: This routine is just an optimization so it does not guarantee |
| 2944 | * that no dcache entries will exist at process exit time it |
| 2945 | * just makes it very unlikely that any will persist. |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2946 | */ |
| 2947 | |
| 2948 | void proc_flush_task(struct task_struct *task) |
| 2949 | { |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2950 | int i; |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2951 | struct pid *pid, *tgid; |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2952 | struct upid *upid; |
| 2953 | |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2954 | pid = task_pid(task); |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2955 | tgid = task_tgid(task); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2956 | |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2957 | for (i = 0; i <= pid->level; i++) { |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2958 | upid = &pid->numbers[i]; |
| 2959 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2960 | tgid->numbers[i].nr); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2961 | } |
Pavel Emelyanov | 6f4e643 | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2962 | |
| 2963 | upid = &pid->numbers[pid->level]; |
| 2964 | if (upid->nr == 1) |
| 2965 | pid_ns_release_proc(upid->ns); |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2966 | } |
| 2967 | |
Adrian Bunk | 9711ef9 | 2006-12-06 20:38:31 -0800 | [diff] [blame] | 2968 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
| 2969 | struct dentry * dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2970 | struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2971 | { |
| 2972 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2973 | struct inode *inode; |
| 2974 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2975 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2976 | if (!inode) |
| 2977 | goto out; |
| 2978 | |
| 2979 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 2980 | inode->i_op = &proc_tgid_base_inode_operations; |
| 2981 | inode->i_fop = &proc_tgid_base_operations; |
| 2982 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 2983 | |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2984 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
| 2985 | ARRAY_SIZE(tgid_base_stuff))); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2986 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2987 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2988 | |
| 2989 | d_add(dentry, inode); |
| 2990 | /* Close the race of the process dying before we return the dentry */ |
| 2991 | if (pid_revalidate(dentry, NULL)) |
| 2992 | error = NULL; |
| 2993 | out: |
| 2994 | return error; |
| 2995 | } |
| 2996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2997 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 2998 | { |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 2999 | struct dentry *result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3000 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3001 | unsigned tgid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3002 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3003 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 3004 | result = proc_base_lookup(dir, dentry); |
| 3005 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) |
| 3006 | goto out; |
| 3007 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | tgid = name_to_int(dentry); |
| 3009 | if (tgid == ~0U) |
| 3010 | goto out; |
| 3011 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3012 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3013 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3014 | task = find_task_by_pid_ns(tgid, ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | if (task) |
| 3016 | get_task_struct(task); |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3017 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3018 | if (!task) |
| 3019 | goto out; |
| 3020 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3021 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 3022 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3023 | out: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 3024 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3025 | } |
| 3026 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3027 | /* |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3028 | * Find the first task with tgid >= tgid |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3029 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3030 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3031 | struct tgid_iter { |
| 3032 | unsigned int tgid; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3033 | struct task_struct *task; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3034 | }; |
| 3035 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) |
| 3036 | { |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3037 | struct pid *pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3038 | |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3039 | if (iter.task) |
| 3040 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3041 | rcu_read_lock(); |
| 3042 | retry: |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3043 | iter.task = NULL; |
| 3044 | pid = find_ge_pid(iter.tgid, ns); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3045 | if (pid) { |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3046 | iter.tgid = pid_nr_ns(pid, ns); |
| 3047 | iter.task = pid_task(pid, PIDTYPE_PID); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3048 | /* What we to know is if the pid we have find is the |
| 3049 | * pid of a thread_group_leader. Testing for task |
| 3050 | * being a thread_group_leader is the obvious thing |
| 3051 | * todo but there is a window when it fails, due to |
| 3052 | * the pid transfer logic in de_thread. |
| 3053 | * |
| 3054 | * So we perform the straight forward test of seeing |
| 3055 | * if the pid we have found is the pid of a thread |
| 3056 | * group leader, and don't worry if the task we have |
| 3057 | * found doesn't happen to be a thread group leader. |
| 3058 | * As we don't care in the case of readdir. |
| 3059 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3060 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
| 3061 | iter.tgid += 1; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3062 | goto retry; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3063 | } |
| 3064 | get_task_struct(iter.task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3065 | } |
Eric W. Biederman | 454cc10 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3066 | rcu_read_unlock(); |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3067 | return iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3068 | } |
| 3069 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 3070 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3071 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3072 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3073 | struct tgid_iter iter) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3074 | { |
| 3075 | char name[PROC_NUMBUF]; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3076 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3077 | return proc_fill_cache(filp, dirent, filldir, name, len, |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3078 | proc_pid_instantiate, iter.task, NULL); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3079 | } |
| 3080 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3081 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
| 3082 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3083 | { |
Linus Torvalds | d8bdc59 | 2011-04-18 10:36:54 -0700 | [diff] [blame] | 3084 | unsigned int nr; |
| 3085 | struct task_struct *reaper; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3086 | struct tgid_iter iter; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3087 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3088 | |
Linus Torvalds | d8bdc59 | 2011-04-18 10:36:54 -0700 | [diff] [blame] | 3089 | if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET) |
| 3090 | goto out_no_task; |
| 3091 | nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
| 3092 | |
| 3093 | reaper = get_proc_task(filp->f_path.dentry->d_inode); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3094 | if (!reaper) |
| 3095 | goto out_no_task; |
| 3096 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 3097 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3098 | const struct pid_entry *p = &proc_base_stuff[nr]; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3099 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 3100 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3101 | } |
| 3102 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3103 | ns = filp->f_dentry->d_sb->s_fs_info; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3104 | iter.task = NULL; |
| 3105 | iter.tgid = filp->f_pos - TGID_OFFSET; |
| 3106 | for (iter = next_tgid(ns, iter); |
| 3107 | iter.task; |
| 3108 | iter.tgid += 1, iter = next_tgid(ns, iter)) { |
| 3109 | filp->f_pos = iter.tgid + TGID_OFFSET; |
| 3110 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { |
| 3111 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3112 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3114 | } |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3115 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
| 3116 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3117 | put_task_struct(reaper); |
| 3118 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3119 | return 0; |
| 3120 | } |
| 3121 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3122 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3123 | * Tasks |
| 3124 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3125 | static const struct pid_entry tid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3126 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
Jerome Marchand | 3835541 | 2010-04-27 13:13:06 -0700 | [diff] [blame] | 3127 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 3128 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3129 | REG("environ", S_IRUSR, proc_environ_operations), |
| 3130 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 3131 | ONE("status", S_IRUGO, proc_pid_status), |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3132 | ONE("personality", S_IRUGO, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 3133 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3134 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3135 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3136 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 3137 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3138 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3139 | INF("syscall", S_IRUGO, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3140 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3141 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 3142 | ONE("stat", S_IRUGO, proc_tid_stat), |
| 3143 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 3144 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3145 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3146 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3147 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3148 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 3149 | LNK("cwd", proc_cwd_link), |
| 3150 | LNK("root", proc_root_link), |
| 3151 | LNK("exe", proc_exe_link), |
| 3152 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 3153 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 3154 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3155 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 3156 | REG("smaps", S_IRUGO, proc_smaps_operations), |
Al Viro | ca6b0bf | 2011-02-15 22:04:37 -0500 | [diff] [blame] | 3157 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3158 | #endif |
| 3159 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3160 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3161 | #endif |
| 3162 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3163 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3164 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 3165 | #ifdef CONFIG_STACKTRACE |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3166 | ONE("stack", S_IRUGO, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3167 | #endif |
| 3168 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3169 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3170 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3171 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3172 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3173 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 3174 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3175 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3176 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3177 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3178 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3179 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3180 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 3181 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 3182 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3183 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3184 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
Al Viro | 26ec3c6 | 2011-02-15 21:24:05 -0500 | [diff] [blame] | 3185 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3186 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3187 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3188 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3189 | #endif |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3190 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 3191 | INF("io", S_IRUSR, proc_tid_io_accounting), |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3192 | #endif |
Chris Metcalf | f133ecc | 2011-05-26 12:40:09 -0400 | [diff] [blame] | 3193 | #ifdef CONFIG_HARDWALL |
| 3194 | INF("hardwall", S_IRUGO, proc_pid_hardwall), |
| 3195 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3196 | }; |
| 3197 | |
| 3198 | static int proc_tid_base_readdir(struct file * filp, |
| 3199 | void * dirent, filldir_t filldir) |
| 3200 | { |
| 3201 | return proc_pident_readdir(filp,dirent,filldir, |
| 3202 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); |
| 3203 | } |
| 3204 | |
| 3205 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 3206 | return proc_pident_lookup(dir, dentry, |
| 3207 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3208 | } |
| 3209 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3210 | static const struct file_operations proc_tid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3211 | .read = generic_read_dir, |
| 3212 | .readdir = proc_tid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3213 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3214 | }; |
| 3215 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3216 | static const struct inode_operations proc_tid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3217 | .lookup = proc_tid_base_lookup, |
| 3218 | .getattr = pid_getattr, |
| 3219 | .setattr = proc_setattr, |
| 3220 | }; |
| 3221 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3222 | static struct dentry *proc_task_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3223 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3224 | { |
| 3225 | struct dentry *error = ERR_PTR(-ENOENT); |
| 3226 | struct inode *inode; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3227 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3228 | |
| 3229 | if (!inode) |
| 3230 | goto out; |
| 3231 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 3232 | inode->i_op = &proc_tid_base_inode_operations; |
| 3233 | inode->i_fop = &proc_tid_base_operations; |
| 3234 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 3235 | |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 3236 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
| 3237 | ARRAY_SIZE(tid_base_stuff))); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3238 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 3239 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3240 | |
| 3241 | d_add(dentry, inode); |
| 3242 | /* Close the race of the process dying before we return the dentry */ |
| 3243 | if (pid_revalidate(dentry, NULL)) |
| 3244 | error = NULL; |
| 3245 | out: |
| 3246 | return error; |
| 3247 | } |
| 3248 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3249 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 3250 | { |
| 3251 | struct dentry *result = ERR_PTR(-ENOENT); |
| 3252 | struct task_struct *task; |
| 3253 | struct task_struct *leader = get_proc_task(dir); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3254 | unsigned tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3255 | struct pid_namespace *ns; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3256 | |
| 3257 | if (!leader) |
| 3258 | goto out_no_task; |
| 3259 | |
| 3260 | tid = name_to_int(dentry); |
| 3261 | if (tid == ~0U) |
| 3262 | goto out; |
| 3263 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3264 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3265 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3266 | task = find_task_by_pid_ns(tid, ns); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3267 | if (task) |
| 3268 | get_task_struct(task); |
| 3269 | rcu_read_unlock(); |
| 3270 | if (!task) |
| 3271 | goto out; |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 3272 | if (!same_thread_group(leader, task)) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3273 | goto out_drop_task; |
| 3274 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3275 | result = proc_task_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3276 | out_drop_task: |
| 3277 | put_task_struct(task); |
| 3278 | out: |
| 3279 | put_task_struct(leader); |
| 3280 | out_no_task: |
| 3281 | return result; |
| 3282 | } |
| 3283 | |
| 3284 | /* |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3285 | * Find the first tid of a thread group to return to user space. |
| 3286 | * |
| 3287 | * Usually this is just the thread group leader, but if the users |
| 3288 | * buffer was too small or there was a seek into the middle of the |
| 3289 | * directory we have more work todo. |
| 3290 | * |
| 3291 | * In the case of a short read we start with find_task_by_pid. |
| 3292 | * |
| 3293 | * In the case of a seek we start with the leader and walk nr |
| 3294 | * threads past it. |
| 3295 | */ |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3296 | static struct task_struct *first_tid(struct task_struct *leader, |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3297 | int tid, int nr, struct pid_namespace *ns) |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3298 | { |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3299 | struct task_struct *pos; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3300 | |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3301 | rcu_read_lock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3302 | /* Attempt to start with the pid of a thread */ |
| 3303 | if (tid && (nr > 0)) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3304 | pos = find_task_by_pid_ns(tid, ns); |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3305 | if (pos && (pos->group_leader == leader)) |
| 3306 | goto found; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3307 | } |
| 3308 | |
| 3309 | /* If nr exceeds the number of threads there is nothing todo */ |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3310 | pos = NULL; |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3311 | if (nr && nr >= get_nr_threads(leader)) |
| 3312 | goto out; |
| 3313 | |
| 3314 | /* If we haven't found our starting place yet start |
| 3315 | * with the leader and walk nr threads forward. |
| 3316 | */ |
| 3317 | for (pos = leader; nr > 0; --nr) { |
| 3318 | pos = next_thread(pos); |
| 3319 | if (pos == leader) { |
| 3320 | pos = NULL; |
| 3321 | goto out; |
| 3322 | } |
| 3323 | } |
| 3324 | found: |
| 3325 | get_task_struct(pos); |
| 3326 | out: |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3327 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3328 | return pos; |
| 3329 | } |
| 3330 | |
| 3331 | /* |
| 3332 | * Find the next thread in the thread list. |
| 3333 | * Return NULL if there is an error or no next thread. |
| 3334 | * |
| 3335 | * The reference to the input task_struct is released. |
| 3336 | */ |
| 3337 | static struct task_struct *next_tid(struct task_struct *start) |
| 3338 | { |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3339 | struct task_struct *pos = NULL; |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3340 | rcu_read_lock(); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3341 | if (pid_alive(start)) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3342 | pos = next_thread(start); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3343 | if (thread_group_leader(pos)) |
| 3344 | pos = NULL; |
| 3345 | else |
| 3346 | get_task_struct(pos); |
| 3347 | } |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3348 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3349 | put_task_struct(start); |
| 3350 | return pos; |
| 3351 | } |
| 3352 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3353 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 3354 | struct task_struct *task, int tid) |
| 3355 | { |
| 3356 | char name[PROC_NUMBUF]; |
| 3357 | int len = snprintf(name, sizeof(name), "%d", tid); |
| 3358 | return proc_fill_cache(filp, dirent, filldir, name, len, |
| 3359 | proc_task_instantiate, task, NULL); |
| 3360 | } |
| 3361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3362 | /* for the /proc/TGID/task/ directories */ |
| 3363 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3364 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 3365 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3366 | struct inode *inode = dentry->d_inode; |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3367 | struct task_struct *leader = NULL; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3368 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3369 | int retval = -ENOENT; |
| 3370 | ino_t ino; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3371 | int tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3372 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3373 | |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3374 | task = get_proc_task(inode); |
| 3375 | if (!task) |
| 3376 | goto out_no_task; |
| 3377 | rcu_read_lock(); |
| 3378 | if (pid_alive(task)) { |
| 3379 | leader = task->group_leader; |
| 3380 | get_task_struct(leader); |
| 3381 | } |
| 3382 | rcu_read_unlock(); |
| 3383 | put_task_struct(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3384 | if (!leader) |
| 3385 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3386 | retval = 0; |
| 3387 | |
Linus Torvalds | ee568b2 | 2009-03-17 10:02:35 -0700 | [diff] [blame] | 3388 | switch ((unsigned long)filp->f_pos) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3389 | case 0: |
| 3390 | ino = inode->i_ino; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3391 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3392 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3393 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3394 | /* fall through */ |
| 3395 | case 1: |
| 3396 | ino = parent_ino(dentry); |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3397 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3398 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3399 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3400 | /* fall through */ |
| 3401 | } |
| 3402 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3403 | /* f_version caches the tgid value that the last readdir call couldn't |
| 3404 | * return. lseek aka telldir automagically resets f_version to 0. |
| 3405 | */ |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3406 | ns = filp->f_dentry->d_sb->s_fs_info; |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3407 | tid = (int)filp->f_version; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3408 | filp->f_version = 0; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3409 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3410 | task; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3411 | task = next_tid(task), filp->f_pos++) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3412 | tid = task_pid_nr_ns(task, ns); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3413 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3414 | /* returning this tgid failed, save it as the first |
| 3415 | * pid for the next readir call */ |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3416 | filp->f_version = (u64)tid; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3417 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3418 | break; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3419 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3420 | } |
| 3421 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3422 | put_task_struct(leader); |
| 3423 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3424 | return retval; |
| 3425 | } |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3426 | |
| 3427 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 3428 | { |
| 3429 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3430 | struct task_struct *p = get_proc_task(inode); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3431 | generic_fillattr(inode, stat); |
| 3432 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3433 | if (p) { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3434 | stat->nlink += get_nr_threads(p); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3435 | put_task_struct(p); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3436 | } |
| 3437 | |
| 3438 | return 0; |
| 3439 | } |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3440 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3441 | static const struct inode_operations proc_task_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3442 | .lookup = proc_task_lookup, |
| 3443 | .getattr = proc_task_getattr, |
| 3444 | .setattr = proc_setattr, |
| 3445 | }; |
| 3446 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3447 | static const struct file_operations proc_task_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3448 | .read = generic_read_dir, |
| 3449 | .readdir = proc_task_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3450 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3451 | }; |