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 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1110 | if (oom_adjust != task->signal->oom_adj) { |
| 1111 | if (oom_adjust == OOM_DISABLE) |
| 1112 | atomic_inc(&task->mm->oom_disable_count); |
| 1113 | if (task->signal->oom_adj == OOM_DISABLE) |
| 1114 | atomic_dec(&task->mm->oom_disable_count); |
| 1115 | } |
| 1116 | |
David Rientjes | 51b1bd2 | 2010-08-09 17:19:47 -0700 | [diff] [blame] | 1117 | /* |
| 1118 | * Warn that /proc/pid/oom_adj is deprecated, see |
| 1119 | * Documentation/feature-removal-schedule.txt. |
| 1120 | */ |
Linus Torvalds | c214270 | 2011-08-06 11:43:08 -0700 | [diff] [blame] | 1121 | 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] | 1122 | current->comm, task_pid_nr(current), task_pid_nr(task), |
| 1123 | task_pid_nr(task)); |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1124 | task->signal->oom_adj = oom_adjust; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1125 | /* |
| 1126 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum |
| 1127 | * value is always attainable. |
| 1128 | */ |
| 1129 | if (task->signal->oom_adj == OOM_ADJUST_MAX) |
| 1130 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; |
| 1131 | else |
| 1132 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / |
| 1133 | -OOM_DISABLE; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1134 | err_sighand: |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1135 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1136 | err_task_lock: |
| 1137 | task_unlock(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1138 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1139 | out: |
| 1140 | return err < 0 ? err : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | } |
| 1142 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1143 | static const struct file_operations proc_oom_adjust_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | .read = oom_adjust_read, |
| 1145 | .write = oom_adjust_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1146 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | }; |
| 1148 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1149 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
| 1150 | size_t count, loff_t *ppos) |
| 1151 | { |
| 1152 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
| 1153 | char buffer[PROC_NUMBUF]; |
| 1154 | int oom_score_adj = OOM_SCORE_ADJ_MIN; |
| 1155 | unsigned long flags; |
| 1156 | size_t len; |
| 1157 | |
| 1158 | if (!task) |
| 1159 | return -ESRCH; |
| 1160 | if (lock_task_sighand(task, &flags)) { |
| 1161 | oom_score_adj = task->signal->oom_score_adj; |
| 1162 | unlock_task_sighand(task, &flags); |
| 1163 | } |
| 1164 | put_task_struct(task); |
| 1165 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); |
| 1166 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 1167 | } |
| 1168 | |
| 1169 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, |
| 1170 | size_t count, loff_t *ppos) |
| 1171 | { |
| 1172 | struct task_struct *task; |
| 1173 | char buffer[PROC_NUMBUF]; |
| 1174 | unsigned long flags; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1175 | int oom_score_adj; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1176 | int err; |
| 1177 | |
| 1178 | memset(buffer, 0, sizeof(buffer)); |
| 1179 | if (count > sizeof(buffer) - 1) |
| 1180 | count = sizeof(buffer) - 1; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1181 | if (copy_from_user(buffer, buf, count)) { |
| 1182 | err = -EFAULT; |
| 1183 | goto out; |
| 1184 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1185 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1186 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1187 | if (err) |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1188 | goto out; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1189 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1190 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
| 1191 | err = -EINVAL; |
| 1192 | goto out; |
| 1193 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1194 | |
| 1195 | task = get_proc_task(file->f_path.dentry->d_inode); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1196 | if (!task) { |
| 1197 | err = -ESRCH; |
| 1198 | goto out; |
| 1199 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1200 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1201 | task_lock(task); |
| 1202 | if (!task->mm) { |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1203 | err = -EINVAL; |
| 1204 | goto err_task_lock; |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1205 | } |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1206 | |
| 1207 | if (!lock_task_sighand(task, &flags)) { |
| 1208 | err = -ESRCH; |
| 1209 | goto err_task_lock; |
| 1210 | } |
| 1211 | |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 1212 | if (oom_score_adj < task->signal->oom_score_adj_min && |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1213 | !capable(CAP_SYS_RESOURCE)) { |
| 1214 | err = -EACCES; |
| 1215 | goto err_sighand; |
| 1216 | } |
| 1217 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1218 | if (oom_score_adj != task->signal->oom_score_adj) { |
| 1219 | if (oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1220 | atomic_inc(&task->mm->oom_disable_count); |
| 1221 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1222 | atomic_dec(&task->mm->oom_disable_count); |
| 1223 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1224 | task->signal->oom_score_adj = oom_score_adj; |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 1225 | if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) |
| 1226 | task->signal->oom_score_adj_min = oom_score_adj; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1227 | /* |
| 1228 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is |
| 1229 | * always attainable. |
| 1230 | */ |
| 1231 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1232 | task->signal->oom_adj = OOM_DISABLE; |
| 1233 | else |
| 1234 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / |
| 1235 | OOM_SCORE_ADJ_MAX; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1236 | err_sighand: |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1237 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1238 | err_task_lock: |
| 1239 | task_unlock(task); |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1240 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1241 | out: |
| 1242 | return err < 0 ? err : count; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1243 | } |
| 1244 | |
| 1245 | static const struct file_operations proc_oom_score_adj_operations = { |
| 1246 | .read = oom_score_adj_read, |
| 1247 | .write = oom_score_adj_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1248 | .llseek = default_llseek, |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1249 | }; |
| 1250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | #ifdef CONFIG_AUDITSYSCALL |
| 1252 | #define TMPBUFLEN 21 |
| 1253 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
| 1254 | size_t count, loff_t *ppos) |
| 1255 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1256 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1257 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | ssize_t length; |
| 1259 | char tmpbuf[TMPBUFLEN]; |
| 1260 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1261 | if (!task) |
| 1262 | return -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
Al Viro | 0c11b94 | 2008-01-10 04:20:52 -0500 | [diff] [blame] | 1264 | audit_get_loginuid(task)); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1265 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1267 | } |
| 1268 | |
| 1269 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, |
| 1270 | size_t count, loff_t *ppos) |
| 1271 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1272 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | char *page, *tmp; |
| 1274 | ssize_t length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | uid_t loginuid; |
| 1276 | |
| 1277 | if (!capable(CAP_AUDIT_CONTROL)) |
| 1278 | return -EPERM; |
| 1279 | |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1280 | rcu_read_lock(); |
| 1281 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { |
| 1282 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | return -EPERM; |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1284 | } |
| 1285 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1287 | if (count >= PAGE_SIZE) |
| 1288 | count = PAGE_SIZE - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
| 1290 | if (*ppos != 0) { |
| 1291 | /* No partial writes. */ |
| 1292 | return -EINVAL; |
| 1293 | } |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1294 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | if (!page) |
| 1296 | return -ENOMEM; |
| 1297 | length = -EFAULT; |
| 1298 | if (copy_from_user(page, buf, count)) |
| 1299 | goto out_free_page; |
| 1300 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1301 | page[count] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | loginuid = simple_strtoul(page, &tmp, 10); |
| 1303 | if (tmp == page) { |
| 1304 | length = -EINVAL; |
| 1305 | goto out_free_page; |
| 1306 | |
| 1307 | } |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1308 | length = audit_set_loginuid(current, loginuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | if (likely(length == 0)) |
| 1310 | length = count; |
| 1311 | |
| 1312 | out_free_page: |
| 1313 | free_page((unsigned long) page); |
| 1314 | return length; |
| 1315 | } |
| 1316 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1317 | static const struct file_operations proc_loginuid_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | .read = proc_loginuid_read, |
| 1319 | .write = proc_loginuid_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1320 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | }; |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1322 | |
| 1323 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, |
| 1324 | size_t count, loff_t *ppos) |
| 1325 | { |
| 1326 | struct inode * inode = file->f_path.dentry->d_inode; |
| 1327 | struct task_struct *task = get_proc_task(inode); |
| 1328 | ssize_t length; |
| 1329 | char tmpbuf[TMPBUFLEN]; |
| 1330 | |
| 1331 | if (!task) |
| 1332 | return -ESRCH; |
| 1333 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| 1334 | audit_get_sessionid(task)); |
| 1335 | put_task_struct(task); |
| 1336 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1337 | } |
| 1338 | |
| 1339 | static const struct file_operations proc_sessionid_operations = { |
| 1340 | .read = proc_sessionid_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1341 | .llseek = generic_file_llseek, |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1342 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | #endif |
| 1344 | |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1345 | #ifdef CONFIG_FAULT_INJECTION |
| 1346 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, |
| 1347 | size_t count, loff_t *ppos) |
| 1348 | { |
| 1349 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 1350 | char buffer[PROC_NUMBUF]; |
| 1351 | size_t len; |
| 1352 | int make_it_fail; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1353 | |
| 1354 | if (!task) |
| 1355 | return -ESRCH; |
| 1356 | make_it_fail = task->make_it_fail; |
| 1357 | put_task_struct(task); |
| 1358 | |
| 1359 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1360 | |
| 1361 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1362 | } |
| 1363 | |
| 1364 | static ssize_t proc_fault_inject_write(struct file * file, |
| 1365 | const char __user * buf, size_t count, loff_t *ppos) |
| 1366 | { |
| 1367 | struct task_struct *task; |
| 1368 | char buffer[PROC_NUMBUF], *end; |
| 1369 | int make_it_fail; |
| 1370 | |
| 1371 | if (!capable(CAP_SYS_RESOURCE)) |
| 1372 | return -EPERM; |
| 1373 | memset(buffer, 0, sizeof(buffer)); |
| 1374 | if (count > sizeof(buffer) - 1) |
| 1375 | count = sizeof(buffer) - 1; |
| 1376 | if (copy_from_user(buffer, buf, count)) |
| 1377 | return -EFAULT; |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1378 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
| 1379 | if (*end) |
| 1380 | return -EINVAL; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1381 | task = get_proc_task(file->f_dentry->d_inode); |
| 1382 | if (!task) |
| 1383 | return -ESRCH; |
| 1384 | task->make_it_fail = make_it_fail; |
| 1385 | put_task_struct(task); |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1386 | |
| 1387 | return count; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1388 | } |
| 1389 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1390 | static const struct file_operations proc_fault_inject_operations = { |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1391 | .read = proc_fault_inject_read, |
| 1392 | .write = proc_fault_inject_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1393 | .llseek = generic_file_llseek, |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1394 | }; |
| 1395 | #endif |
| 1396 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1397 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1398 | #ifdef CONFIG_SCHED_DEBUG |
| 1399 | /* |
| 1400 | * Print out various scheduling related per-task fields: |
| 1401 | */ |
| 1402 | static int sched_show(struct seq_file *m, void *v) |
| 1403 | { |
| 1404 | struct inode *inode = m->private; |
| 1405 | struct task_struct *p; |
| 1406 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1407 | p = get_proc_task(inode); |
| 1408 | if (!p) |
| 1409 | return -ESRCH; |
| 1410 | proc_sched_show_task(p, m); |
| 1411 | |
| 1412 | put_task_struct(p); |
| 1413 | |
| 1414 | return 0; |
| 1415 | } |
| 1416 | |
| 1417 | static ssize_t |
| 1418 | sched_write(struct file *file, const char __user *buf, |
| 1419 | size_t count, loff_t *offset) |
| 1420 | { |
| 1421 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1422 | struct task_struct *p; |
| 1423 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1424 | p = get_proc_task(inode); |
| 1425 | if (!p) |
| 1426 | return -ESRCH; |
| 1427 | proc_sched_set_task(p); |
| 1428 | |
| 1429 | put_task_struct(p); |
| 1430 | |
| 1431 | return count; |
| 1432 | } |
| 1433 | |
| 1434 | static int sched_open(struct inode *inode, struct file *filp) |
| 1435 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 1436 | return single_open(filp, sched_show, inode); |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1437 | } |
| 1438 | |
| 1439 | static const struct file_operations proc_pid_sched_operations = { |
| 1440 | .open = sched_open, |
| 1441 | .read = seq_read, |
| 1442 | .write = sched_write, |
| 1443 | .llseek = seq_lseek, |
Alexey Dobriyan | 5ea473a | 2007-07-31 00:38:50 -0700 | [diff] [blame] | 1444 | .release = single_release, |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1445 | }; |
| 1446 | |
| 1447 | #endif |
| 1448 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1449 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 1450 | /* |
| 1451 | * Print out autogroup related information: |
| 1452 | */ |
| 1453 | static int sched_autogroup_show(struct seq_file *m, void *v) |
| 1454 | { |
| 1455 | struct inode *inode = m->private; |
| 1456 | struct task_struct *p; |
| 1457 | |
| 1458 | p = get_proc_task(inode); |
| 1459 | if (!p) |
| 1460 | return -ESRCH; |
| 1461 | proc_sched_autogroup_show_task(p, m); |
| 1462 | |
| 1463 | put_task_struct(p); |
| 1464 | |
| 1465 | return 0; |
| 1466 | } |
| 1467 | |
| 1468 | static ssize_t |
| 1469 | sched_autogroup_write(struct file *file, const char __user *buf, |
| 1470 | size_t count, loff_t *offset) |
| 1471 | { |
| 1472 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1473 | struct task_struct *p; |
| 1474 | char buffer[PROC_NUMBUF]; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1475 | int nice; |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1476 | int err; |
| 1477 | |
| 1478 | memset(buffer, 0, sizeof(buffer)); |
| 1479 | if (count > sizeof(buffer) - 1) |
| 1480 | count = sizeof(buffer) - 1; |
| 1481 | if (copy_from_user(buffer, buf, count)) |
| 1482 | return -EFAULT; |
| 1483 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1484 | err = kstrtoint(strstrip(buffer), 0, &nice); |
| 1485 | if (err < 0) |
| 1486 | return err; |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1487 | |
| 1488 | p = get_proc_task(inode); |
| 1489 | if (!p) |
| 1490 | return -ESRCH; |
| 1491 | |
| 1492 | err = nice; |
| 1493 | err = proc_sched_autogroup_set_nice(p, &err); |
| 1494 | if (err) |
| 1495 | count = err; |
| 1496 | |
| 1497 | put_task_struct(p); |
| 1498 | |
| 1499 | return count; |
| 1500 | } |
| 1501 | |
| 1502 | static int sched_autogroup_open(struct inode *inode, struct file *filp) |
| 1503 | { |
| 1504 | int ret; |
| 1505 | |
| 1506 | ret = single_open(filp, sched_autogroup_show, NULL); |
| 1507 | if (!ret) { |
| 1508 | struct seq_file *m = filp->private_data; |
| 1509 | |
| 1510 | m->private = inode; |
| 1511 | } |
| 1512 | return ret; |
| 1513 | } |
| 1514 | |
| 1515 | static const struct file_operations proc_pid_sched_autogroup_operations = { |
| 1516 | .open = sched_autogroup_open, |
| 1517 | .read = seq_read, |
| 1518 | .write = sched_autogroup_write, |
| 1519 | .llseek = seq_lseek, |
| 1520 | .release = single_release, |
| 1521 | }; |
| 1522 | |
| 1523 | #endif /* CONFIG_SCHED_AUTOGROUP */ |
| 1524 | |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1525 | static ssize_t comm_write(struct file *file, const char __user *buf, |
| 1526 | size_t count, loff_t *offset) |
| 1527 | { |
| 1528 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1529 | struct task_struct *p; |
| 1530 | char buffer[TASK_COMM_LEN]; |
| 1531 | |
| 1532 | memset(buffer, 0, sizeof(buffer)); |
| 1533 | if (count > sizeof(buffer) - 1) |
| 1534 | count = sizeof(buffer) - 1; |
| 1535 | if (copy_from_user(buffer, buf, count)) |
| 1536 | return -EFAULT; |
| 1537 | |
| 1538 | p = get_proc_task(inode); |
| 1539 | if (!p) |
| 1540 | return -ESRCH; |
| 1541 | |
| 1542 | if (same_thread_group(current, p)) |
| 1543 | set_task_comm(p, buffer); |
| 1544 | else |
| 1545 | count = -EINVAL; |
| 1546 | |
| 1547 | put_task_struct(p); |
| 1548 | |
| 1549 | return count; |
| 1550 | } |
| 1551 | |
| 1552 | static int comm_show(struct seq_file *m, void *v) |
| 1553 | { |
| 1554 | struct inode *inode = m->private; |
| 1555 | struct task_struct *p; |
| 1556 | |
| 1557 | p = get_proc_task(inode); |
| 1558 | if (!p) |
| 1559 | return -ESRCH; |
| 1560 | |
| 1561 | task_lock(p); |
| 1562 | seq_printf(m, "%s\n", p->comm); |
| 1563 | task_unlock(p); |
| 1564 | |
| 1565 | put_task_struct(p); |
| 1566 | |
| 1567 | return 0; |
| 1568 | } |
| 1569 | |
| 1570 | static int comm_open(struct inode *inode, struct file *filp) |
| 1571 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 1572 | return single_open(filp, comm_show, inode); |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1573 | } |
| 1574 | |
| 1575 | static const struct file_operations proc_pid_set_comm_operations = { |
| 1576 | .open = comm_open, |
| 1577 | .read = seq_read, |
| 1578 | .write = comm_write, |
| 1579 | .llseek = seq_lseek, |
| 1580 | .release = single_release, |
| 1581 | }; |
| 1582 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1583 | static int proc_exe_link(struct inode *inode, struct path *exe_path) |
| 1584 | { |
| 1585 | struct task_struct *task; |
| 1586 | struct mm_struct *mm; |
| 1587 | struct file *exe_file; |
| 1588 | |
| 1589 | task = get_proc_task(inode); |
| 1590 | if (!task) |
| 1591 | return -ENOENT; |
| 1592 | mm = get_task_mm(task); |
| 1593 | put_task_struct(task); |
| 1594 | if (!mm) |
| 1595 | return -ENOENT; |
| 1596 | exe_file = get_mm_exe_file(mm); |
| 1597 | mmput(mm); |
| 1598 | if (exe_file) { |
| 1599 | *exe_path = exe_file->f_path; |
| 1600 | path_get(&exe_file->f_path); |
| 1601 | fput(exe_file); |
| 1602 | return 0; |
| 1603 | } else |
| 1604 | return -ENOENT; |
| 1605 | } |
| 1606 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1607 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | { |
| 1609 | struct inode *inode = dentry->d_inode; |
| 1610 | int error = -EACCES; |
| 1611 | |
| 1612 | /* We don't need a base pointer in the /proc filesystem */ |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 1613 | path_put(&nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1615 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1616 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1619 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | out: |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1621 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | } |
| 1623 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1624 | 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] | 1625 | { |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1626 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1627 | char *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | int len; |
| 1629 | |
| 1630 | if (!tmp) |
| 1631 | return -ENOMEM; |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1632 | |
Eric W. Biederman | 7b2a69b | 2010-12-05 15:51:21 -0800 | [diff] [blame] | 1633 | pathname = d_path(path, tmp, PAGE_SIZE); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1634 | len = PTR_ERR(pathname); |
| 1635 | if (IS_ERR(pathname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | goto out; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1637 | len = tmp + PAGE_SIZE - 1 - pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | |
| 1639 | if (len > buflen) |
| 1640 | len = buflen; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1641 | if (copy_to_user(buffer, pathname, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | len = -EFAULT; |
| 1643 | out: |
| 1644 | free_page((unsigned long)tmp); |
| 1645 | return len; |
| 1646 | } |
| 1647 | |
| 1648 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) |
| 1649 | { |
| 1650 | int error = -EACCES; |
| 1651 | struct inode *inode = dentry->d_inode; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1652 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1654 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1655 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1658 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | if (error) |
| 1660 | goto out; |
| 1661 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1662 | error = do_proc_readlink(&path, buffer, buflen); |
| 1663 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | return error; |
| 1666 | } |
| 1667 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1668 | static const struct inode_operations proc_pid_link_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | .readlink = proc_pid_readlink, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1670 | .follow_link = proc_pid_follow_link, |
| 1671 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | }; |
| 1673 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1674 | |
| 1675 | /* building an inode */ |
| 1676 | |
| 1677 | static int task_dumpable(struct task_struct *task) |
| 1678 | { |
| 1679 | int dumpable = 0; |
| 1680 | struct mm_struct *mm; |
| 1681 | |
| 1682 | task_lock(task); |
| 1683 | mm = task->mm; |
| 1684 | if (mm) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 1685 | dumpable = get_dumpable(mm); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1686 | task_unlock(task); |
| 1687 | if(dumpable == 1) |
| 1688 | return 1; |
| 1689 | return 0; |
| 1690 | } |
| 1691 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1692 | 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] | 1693 | { |
| 1694 | struct inode * inode; |
| 1695 | struct proc_inode *ei; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1696 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1697 | |
| 1698 | /* We need a new inode */ |
| 1699 | |
| 1700 | inode = new_inode(sb); |
| 1701 | if (!inode) |
| 1702 | goto out; |
| 1703 | |
| 1704 | /* Common stuff */ |
| 1705 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 1706 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1707 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1708 | inode->i_op = &proc_def_inode_operations; |
| 1709 | |
| 1710 | /* |
| 1711 | * grab the reference to task. |
| 1712 | */ |
Oleg Nesterov | 1a657f7 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 1713 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1714 | if (!ei->pid) |
| 1715 | goto out_unlock; |
| 1716 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1717 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1718 | rcu_read_lock(); |
| 1719 | cred = __task_cred(task); |
| 1720 | inode->i_uid = cred->euid; |
| 1721 | inode->i_gid = cred->egid; |
| 1722 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1723 | } |
| 1724 | security_task_to_inode(task, inode); |
| 1725 | |
| 1726 | out: |
| 1727 | return inode; |
| 1728 | |
| 1729 | out_unlock: |
| 1730 | iput(inode); |
| 1731 | return NULL; |
| 1732 | } |
| 1733 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1734 | 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] | 1735 | { |
| 1736 | struct inode *inode = dentry->d_inode; |
| 1737 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1738 | const struct cred *cred; |
| 1739 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1740 | generic_fillattr(inode, stat); |
| 1741 | |
| 1742 | rcu_read_lock(); |
| 1743 | stat->uid = 0; |
| 1744 | stat->gid = 0; |
| 1745 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
| 1746 | if (task) { |
| 1747 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1748 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1749 | cred = __task_cred(task); |
| 1750 | stat->uid = cred->euid; |
| 1751 | stat->gid = cred->egid; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1752 | } |
| 1753 | } |
| 1754 | rcu_read_unlock(); |
| 1755 | return 0; |
| 1756 | } |
| 1757 | |
| 1758 | /* dentry stuff */ |
| 1759 | |
| 1760 | /* |
| 1761 | * Exceptional case: normally we are not allowed to unhash a busy |
| 1762 | * directory. In this case, however, we can do it - no aliasing problems |
| 1763 | * due to the way we treat inodes. |
| 1764 | * |
| 1765 | * Rewrite the inode's ownerships here because the owning task may have |
| 1766 | * performed a setuid(), etc. |
| 1767 | * |
| 1768 | * Before the /proc/pid/status file was created the only way to read |
| 1769 | * the effective uid of a /process was to stat /proc/pid. Reading |
| 1770 | * /proc/pid/status is slow enough that procps and other packages |
| 1771 | * kept stating /proc/pid. To keep the rules in /proc simple I have |
| 1772 | * made this apply to all per process world readable and executable |
| 1773 | * directories. |
| 1774 | */ |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1775 | int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1776 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1777 | struct inode *inode; |
| 1778 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1779 | const struct cred *cred; |
| 1780 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1781 | if (nd && nd->flags & LOOKUP_RCU) |
| 1782 | return -ECHILD; |
| 1783 | |
| 1784 | inode = dentry->d_inode; |
| 1785 | task = get_proc_task(inode); |
| 1786 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1787 | if (task) { |
| 1788 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1789 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1790 | rcu_read_lock(); |
| 1791 | cred = __task_cred(task); |
| 1792 | inode->i_uid = cred->euid; |
| 1793 | inode->i_gid = cred->egid; |
| 1794 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1795 | } else { |
| 1796 | inode->i_uid = 0; |
| 1797 | inode->i_gid = 0; |
| 1798 | } |
| 1799 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1800 | security_task_to_inode(task, inode); |
| 1801 | put_task_struct(task); |
| 1802 | return 1; |
| 1803 | } |
| 1804 | d_drop(dentry); |
| 1805 | return 0; |
| 1806 | } |
| 1807 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 1808 | static int pid_delete_dentry(const struct dentry * dentry) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1809 | { |
| 1810 | /* Is the task we represent dead? |
| 1811 | * If so, then don't put the dentry on the lru list, |
| 1812 | * kill it immediately. |
| 1813 | */ |
| 1814 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; |
| 1815 | } |
| 1816 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1817 | const struct dentry_operations pid_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1818 | { |
| 1819 | .d_revalidate = pid_revalidate, |
| 1820 | .d_delete = pid_delete_dentry, |
| 1821 | }; |
| 1822 | |
| 1823 | /* Lookups */ |
| 1824 | |
Eric W. Biederman | 1c0d04c | 2006-10-02 02:18:57 -0700 | [diff] [blame] | 1825 | /* |
| 1826 | * Fill a directory entry. |
| 1827 | * |
| 1828 | * If possible create the dcache entry and derive our inode number and |
| 1829 | * file type from dcache entry. |
| 1830 | * |
| 1831 | * Since all of the proc inode numbers are dynamically generated, the inode |
| 1832 | * numbers do not exist until the inode is cache. This means creating the |
| 1833 | * the dcache entry in readdir is necessary to keep the inode numbers |
| 1834 | * reported by readdir in sync with the inode numbers reported |
| 1835 | * by stat. |
| 1836 | */ |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1837 | int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 1838 | const char *name, int len, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1839 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1840 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1841 | struct dentry *child, *dir = filp->f_path.dentry; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1842 | struct inode *inode; |
| 1843 | struct qstr qname; |
| 1844 | ino_t ino = 0; |
| 1845 | unsigned type = DT_UNKNOWN; |
| 1846 | |
| 1847 | qname.name = name; |
| 1848 | qname.len = len; |
| 1849 | qname.hash = full_name_hash(name, len); |
| 1850 | |
| 1851 | child = d_lookup(dir, &qname); |
| 1852 | if (!child) { |
| 1853 | struct dentry *new; |
| 1854 | new = d_alloc(dir, &qname); |
| 1855 | if (new) { |
| 1856 | child = instantiate(dir->d_inode, new, task, ptr); |
| 1857 | if (child) |
| 1858 | dput(new); |
| 1859 | else |
| 1860 | child = new; |
| 1861 | } |
| 1862 | } |
| 1863 | if (!child || IS_ERR(child) || !child->d_inode) |
| 1864 | goto end_instantiate; |
| 1865 | inode = child->d_inode; |
| 1866 | if (inode) { |
| 1867 | ino = inode->i_ino; |
| 1868 | type = inode->i_mode >> 12; |
| 1869 | } |
| 1870 | dput(child); |
| 1871 | end_instantiate: |
| 1872 | if (!ino) |
| 1873 | ino = find_inode_number(dir, &qname); |
| 1874 | if (!ino) |
| 1875 | ino = 1; |
| 1876 | return filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1877 | } |
| 1878 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1879 | static unsigned name_to_int(struct dentry *dentry) |
| 1880 | { |
| 1881 | const char *name = dentry->d_name.name; |
| 1882 | int len = dentry->d_name.len; |
| 1883 | unsigned n = 0; |
| 1884 | |
| 1885 | if (len > 1 && *name == '0') |
| 1886 | goto out; |
| 1887 | while (len-- > 0) { |
| 1888 | unsigned c = *name++ - '0'; |
| 1889 | if (c > 9) |
| 1890 | goto out; |
| 1891 | if (n >= (~0U-9)/10) |
| 1892 | goto out; |
| 1893 | n *= 10; |
| 1894 | n += c; |
| 1895 | } |
| 1896 | return n; |
| 1897 | out: |
| 1898 | return ~0U; |
| 1899 | } |
| 1900 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1901 | #define PROC_FDINFO_MAX 64 |
| 1902 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1903 | 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] | 1904 | { |
| 1905 | struct task_struct *task = get_proc_task(inode); |
| 1906 | struct files_struct *files = NULL; |
| 1907 | struct file *file; |
| 1908 | int fd = proc_fd(inode); |
| 1909 | |
| 1910 | if (task) { |
| 1911 | files = get_files_struct(task); |
| 1912 | put_task_struct(task); |
| 1913 | } |
| 1914 | if (files) { |
| 1915 | /* |
| 1916 | * We are not taking a ref to the file structure, so we must |
| 1917 | * hold ->file_lock. |
| 1918 | */ |
| 1919 | spin_lock(&files->file_lock); |
| 1920 | file = fcheck_files(files, fd); |
| 1921 | if (file) { |
Linus Torvalds | 1117f72 | 2011-08-06 11:51:33 -0700 | [diff] [blame^] | 1922 | unsigned int f_flags; |
| 1923 | struct fdtable *fdt; |
| 1924 | |
| 1925 | fdt = files_fdtable(files); |
| 1926 | f_flags = file->f_flags & ~O_CLOEXEC; |
| 1927 | if (FD_ISSET(fd, fdt->close_on_exec)) |
| 1928 | f_flags |= O_CLOEXEC; |
| 1929 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1930 | if (path) { |
| 1931 | *path = file->f_path; |
| 1932 | path_get(&file->f_path); |
| 1933 | } |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1934 | if (info) |
| 1935 | snprintf(info, PROC_FDINFO_MAX, |
| 1936 | "pos:\t%lli\n" |
| 1937 | "flags:\t0%o\n", |
| 1938 | (long long) file->f_pos, |
Linus Torvalds | 1117f72 | 2011-08-06 11:51:33 -0700 | [diff] [blame^] | 1939 | f_flags); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1940 | spin_unlock(&files->file_lock); |
| 1941 | put_files_struct(files); |
| 1942 | return 0; |
| 1943 | } |
| 1944 | spin_unlock(&files->file_lock); |
| 1945 | put_files_struct(files); |
| 1946 | } |
| 1947 | return -ENOENT; |
| 1948 | } |
| 1949 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1950 | static int proc_fd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1951 | { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1952 | return proc_fd_info(inode, path, NULL); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1953 | } |
| 1954 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1955 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1956 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1957 | struct inode *inode; |
| 1958 | struct task_struct *task; |
| 1959 | int fd; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1960 | struct files_struct *files; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1961 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1962 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1963 | if (nd && nd->flags & LOOKUP_RCU) |
| 1964 | return -ECHILD; |
| 1965 | |
| 1966 | inode = dentry->d_inode; |
| 1967 | task = get_proc_task(inode); |
| 1968 | fd = proc_fd(inode); |
| 1969 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1970 | if (task) { |
| 1971 | files = get_files_struct(task); |
| 1972 | if (files) { |
| 1973 | rcu_read_lock(); |
| 1974 | if (fcheck_files(files, fd)) { |
| 1975 | rcu_read_unlock(); |
| 1976 | put_files_struct(files); |
| 1977 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1978 | rcu_read_lock(); |
| 1979 | cred = __task_cred(task); |
| 1980 | inode->i_uid = cred->euid; |
| 1981 | inode->i_gid = cred->egid; |
| 1982 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1983 | } else { |
| 1984 | inode->i_uid = 0; |
| 1985 | inode->i_gid = 0; |
| 1986 | } |
| 1987 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1988 | security_task_to_inode(task, inode); |
| 1989 | put_task_struct(task); |
| 1990 | return 1; |
| 1991 | } |
| 1992 | rcu_read_unlock(); |
| 1993 | put_files_struct(files); |
| 1994 | } |
| 1995 | put_task_struct(task); |
| 1996 | } |
| 1997 | d_drop(dentry); |
| 1998 | return 0; |
| 1999 | } |
| 2000 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 2001 | static const struct dentry_operations tid_fd_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2002 | { |
| 2003 | .d_revalidate = tid_fd_revalidate, |
| 2004 | .d_delete = pid_delete_dentry, |
| 2005 | }; |
| 2006 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2007 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2008 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2009 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2010 | unsigned fd = *(const unsigned *)ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2011 | struct file *file; |
| 2012 | struct files_struct *files; |
| 2013 | struct inode *inode; |
| 2014 | struct proc_inode *ei; |
| 2015 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2016 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2017 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2018 | if (!inode) |
| 2019 | goto out; |
| 2020 | ei = PROC_I(inode); |
| 2021 | ei->fd = fd; |
| 2022 | files = get_files_struct(task); |
| 2023 | if (!files) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2024 | goto out_iput; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2025 | inode->i_mode = S_IFLNK; |
| 2026 | |
| 2027 | /* |
| 2028 | * We are not taking a ref to the file structure, so we must |
| 2029 | * hold ->file_lock. |
| 2030 | */ |
| 2031 | spin_lock(&files->file_lock); |
| 2032 | file = fcheck_files(files, fd); |
| 2033 | if (!file) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2034 | goto out_unlock; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 2035 | if (file->f_mode & FMODE_READ) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2036 | inode->i_mode |= S_IRUSR | S_IXUSR; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 2037 | if (file->f_mode & FMODE_WRITE) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2038 | inode->i_mode |= S_IWUSR | S_IXUSR; |
| 2039 | spin_unlock(&files->file_lock); |
| 2040 | put_files_struct(files); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2041 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2042 | inode->i_op = &proc_pid_link_inode_operations; |
| 2043 | inode->i_size = 64; |
| 2044 | ei->op.proc_get_link = proc_fd_link; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2045 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2046 | d_add(dentry, inode); |
| 2047 | /* Close the race of the process dying before we return the dentry */ |
| 2048 | if (tid_fd_revalidate(dentry, NULL)) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2049 | error = NULL; |
| 2050 | |
| 2051 | out: |
| 2052 | return error; |
| 2053 | out_unlock: |
| 2054 | spin_unlock(&files->file_lock); |
| 2055 | put_files_struct(files); |
| 2056 | out_iput: |
| 2057 | iput(inode); |
| 2058 | goto out; |
| 2059 | } |
| 2060 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2061 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
| 2062 | struct dentry *dentry, |
| 2063 | instantiate_t instantiate) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2064 | { |
| 2065 | struct task_struct *task = get_proc_task(dir); |
| 2066 | unsigned fd = name_to_int(dentry); |
| 2067 | struct dentry *result = ERR_PTR(-ENOENT); |
| 2068 | |
| 2069 | if (!task) |
| 2070 | goto out_no_task; |
| 2071 | if (fd == ~0U) |
| 2072 | goto out; |
| 2073 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2074 | result = instantiate(dir, dentry, task, &fd); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2075 | out: |
| 2076 | put_task_struct(task); |
| 2077 | out_no_task: |
| 2078 | return result; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2079 | } |
| 2080 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2081 | static int proc_readfd_common(struct file * filp, void * dirent, |
| 2082 | filldir_t filldir, instantiate_t instantiate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2084 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 2085 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2086 | struct task_struct *p = get_proc_task(inode); |
Pavel Emelyanov | 457c251 | 2007-10-18 23:40:43 -0700 | [diff] [blame] | 2087 | unsigned int fd, ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | struct files_struct * files; |
| 2090 | |
| 2091 | retval = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2092 | if (!p) |
| 2093 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | |
| 2096 | fd = filp->f_pos; |
| 2097 | switch (fd) { |
| 2098 | case 0: |
| 2099 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
| 2100 | goto out; |
| 2101 | filp->f_pos++; |
| 2102 | case 1: |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 2103 | ino = parent_ino(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) |
| 2105 | goto out; |
| 2106 | filp->f_pos++; |
| 2107 | default: |
| 2108 | files = get_files_struct(p); |
| 2109 | if (!files) |
| 2110 | goto out; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2111 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | for (fd = filp->f_pos-2; |
Al Viro | 9b4f526 | 2008-04-22 01:32:44 -0400 | [diff] [blame] | 2113 | fd < files_fdtable(files)->max_fds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | fd++, filp->f_pos++) { |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2115 | char name[PROC_NUMBUF]; |
| 2116 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | |
| 2118 | if (!fcheck_files(files, fd)) |
| 2119 | continue; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2120 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2122 | len = snprintf(name, sizeof(name), "%d", fd); |
| 2123 | if (proc_fill_cache(filp, dirent, filldir, |
| 2124 | name, len, instantiate, |
| 2125 | p, &fd) < 0) { |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2126 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | break; |
| 2128 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2129 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2131 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | put_files_struct(files); |
| 2133 | } |
| 2134 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2135 | put_task_struct(p); |
| 2136 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | return retval; |
| 2138 | } |
| 2139 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2140 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
| 2141 | struct nameidata *nd) |
| 2142 | { |
| 2143 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); |
| 2144 | } |
| 2145 | |
| 2146 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) |
| 2147 | { |
| 2148 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); |
| 2149 | } |
| 2150 | |
| 2151 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, |
| 2152 | size_t len, loff_t *ppos) |
| 2153 | { |
| 2154 | char tmp[PROC_FDINFO_MAX]; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 2155 | 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] | 2156 | if (!err) |
| 2157 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); |
| 2158 | return err; |
| 2159 | } |
| 2160 | |
| 2161 | static const struct file_operations proc_fdinfo_file_operations = { |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2162 | .open = nonseekable_open, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2163 | .read = proc_fdinfo_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2164 | .llseek = no_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2165 | }; |
| 2166 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2167 | static const struct file_operations proc_fd_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | .read = generic_read_dir, |
| 2169 | .readdir = proc_readfd, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2170 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | }; |
| 2172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | /* |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2174 | * /proc/pid/fd needs a special permission handler so that a process can still |
| 2175 | * access /proc/self/fd after it has executed a setuid(). |
| 2176 | */ |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 2177 | static int proc_fd_permission(struct inode *inode, int mask) |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2178 | { |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 2179 | int rv = generic_permission(inode, mask); |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2180 | if (rv == 0) |
| 2181 | return 0; |
| 2182 | if (task_pid(current) == proc_pid(inode)) |
| 2183 | rv = 0; |
| 2184 | return rv; |
| 2185 | } |
| 2186 | |
| 2187 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | * proc directories can do almost nothing.. |
| 2189 | */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2190 | static const struct inode_operations proc_fd_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | .lookup = proc_lookupfd, |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2192 | .permission = proc_fd_permission, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2193 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | }; |
| 2195 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2196 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
| 2197 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
| 2198 | { |
| 2199 | unsigned fd = *(unsigned *)ptr; |
| 2200 | struct inode *inode; |
| 2201 | struct proc_inode *ei; |
| 2202 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2203 | |
| 2204 | inode = proc_pid_make_inode(dir->i_sb, task); |
| 2205 | if (!inode) |
| 2206 | goto out; |
| 2207 | ei = PROC_I(inode); |
| 2208 | ei->fd = fd; |
| 2209 | inode->i_mode = S_IFREG | S_IRUSR; |
| 2210 | inode->i_fop = &proc_fdinfo_file_operations; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2211 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2212 | d_add(dentry, inode); |
| 2213 | /* Close the race of the process dying before we return the dentry */ |
| 2214 | if (tid_fd_revalidate(dentry, NULL)) |
| 2215 | error = NULL; |
| 2216 | |
| 2217 | out: |
| 2218 | return error; |
| 2219 | } |
| 2220 | |
| 2221 | static struct dentry *proc_lookupfdinfo(struct inode *dir, |
| 2222 | struct dentry *dentry, |
| 2223 | struct nameidata *nd) |
| 2224 | { |
| 2225 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); |
| 2226 | } |
| 2227 | |
| 2228 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) |
| 2229 | { |
| 2230 | return proc_readfd_common(filp, dirent, filldir, |
| 2231 | proc_fdinfo_instantiate); |
| 2232 | } |
| 2233 | |
| 2234 | static const struct file_operations proc_fdinfo_operations = { |
| 2235 | .read = generic_read_dir, |
| 2236 | .readdir = proc_readfdinfo, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2237 | .llseek = default_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2238 | }; |
| 2239 | |
| 2240 | /* |
| 2241 | * proc directories can do almost nothing.. |
| 2242 | */ |
| 2243 | static const struct inode_operations proc_fdinfo_inode_operations = { |
| 2244 | .lookup = proc_lookupfdinfo, |
| 2245 | .setattr = proc_setattr, |
| 2246 | }; |
| 2247 | |
| 2248 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2249 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2250 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2251 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2252 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2253 | struct inode *inode; |
| 2254 | struct proc_inode *ei; |
KOSAKI Motohiro | bd6daba | 2009-05-28 14:34:21 -0700 | [diff] [blame] | 2255 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2256 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2257 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2258 | if (!inode) |
| 2259 | goto out; |
| 2260 | |
| 2261 | ei = PROC_I(inode); |
| 2262 | inode->i_mode = p->mode; |
| 2263 | if (S_ISDIR(inode->i_mode)) |
| 2264 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ |
| 2265 | if (p->iop) |
| 2266 | inode->i_op = p->iop; |
| 2267 | if (p->fop) |
| 2268 | inode->i_fop = p->fop; |
| 2269 | ei->op = p->op; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2270 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2271 | d_add(dentry, inode); |
| 2272 | /* Close the race of the process dying before we return the dentry */ |
| 2273 | if (pid_revalidate(dentry, NULL)) |
| 2274 | error = NULL; |
| 2275 | out: |
| 2276 | return error; |
| 2277 | } |
| 2278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | static struct dentry *proc_pident_lookup(struct inode *dir, |
| 2280 | struct dentry *dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2281 | const struct pid_entry *ents, |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2282 | unsigned int nents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2284 | struct dentry *error; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2285 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2286 | const struct pid_entry *p, *last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2288 | error = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2289 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2290 | if (!task) |
| 2291 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2293 | /* |
| 2294 | * Yes, it does not scale. And it should not. Don't add |
| 2295 | * new entries into /proc/<tgid>/ without very good reasons. |
| 2296 | */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2297 | last = &ents[nents - 1]; |
| 2298 | for (p = ents; p <= last; p++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | if (p->len != dentry->d_name.len) |
| 2300 | continue; |
| 2301 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2302 | break; |
| 2303 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2304 | if (p > last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2305 | goto out; |
| 2306 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2307 | error = proc_pident_instantiate(dir, dentry, task, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2309 | put_task_struct(task); |
| 2310 | out_no_task: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2311 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2312 | } |
| 2313 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2314 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
| 2315 | 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] | 2316 | { |
| 2317 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2318 | proc_pident_instantiate, task, p); |
| 2319 | } |
| 2320 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2321 | static int proc_pident_readdir(struct file *filp, |
| 2322 | void *dirent, filldir_t filldir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2323 | const struct pid_entry *ents, unsigned int nents) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2324 | { |
| 2325 | int i; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2326 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2327 | struct inode *inode = dentry->d_inode; |
| 2328 | struct task_struct *task = get_proc_task(inode); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2329 | const struct pid_entry *p, *last; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2330 | ino_t ino; |
| 2331 | int ret; |
| 2332 | |
| 2333 | ret = -ENOENT; |
| 2334 | if (!task) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2335 | goto out_no_task; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2336 | |
| 2337 | ret = 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2338 | i = filp->f_pos; |
| 2339 | switch (i) { |
| 2340 | case 0: |
| 2341 | ino = inode->i_ino; |
| 2342 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| 2343 | goto out; |
| 2344 | i++; |
| 2345 | filp->f_pos++; |
| 2346 | /* fall through */ |
| 2347 | case 1: |
| 2348 | ino = parent_ino(dentry); |
| 2349 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| 2350 | goto out; |
| 2351 | i++; |
| 2352 | filp->f_pos++; |
| 2353 | /* fall through */ |
| 2354 | default: |
| 2355 | i -= 2; |
| 2356 | if (i >= nents) { |
| 2357 | ret = 1; |
| 2358 | goto out; |
| 2359 | } |
| 2360 | p = ents + i; |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2361 | last = &ents[nents - 1]; |
| 2362 | while (p <= last) { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2363 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2364 | goto out; |
| 2365 | filp->f_pos++; |
| 2366 | p++; |
| 2367 | } |
| 2368 | } |
| 2369 | |
| 2370 | ret = 1; |
| 2371 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2372 | put_task_struct(task); |
| 2373 | out_no_task: |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2374 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2375 | } |
| 2376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | #ifdef CONFIG_SECURITY |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2378 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, |
| 2379 | size_t count, loff_t *ppos) |
| 2380 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2381 | struct inode * inode = file->f_path.dentry->d_inode; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2382 | char *p = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2383 | ssize_t length; |
| 2384 | struct task_struct *task = get_proc_task(inode); |
| 2385 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2386 | if (!task) |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2387 | return -ESRCH; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2388 | |
| 2389 | length = security_getprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2390 | (char*)file->f_path.dentry->d_name.name, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2391 | &p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2392 | put_task_struct(task); |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2393 | if (length > 0) |
| 2394 | length = simple_read_from_buffer(buf, count, ppos, p, length); |
| 2395 | kfree(p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2396 | return length; |
| 2397 | } |
| 2398 | |
| 2399 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| 2400 | size_t count, loff_t *ppos) |
| 2401 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2402 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2403 | char *page; |
| 2404 | ssize_t length; |
| 2405 | struct task_struct *task = get_proc_task(inode); |
| 2406 | |
| 2407 | length = -ESRCH; |
| 2408 | if (!task) |
| 2409 | goto out_no_task; |
| 2410 | if (count > PAGE_SIZE) |
| 2411 | count = PAGE_SIZE; |
| 2412 | |
| 2413 | /* No partial writes. */ |
| 2414 | length = -EINVAL; |
| 2415 | if (*ppos != 0) |
| 2416 | goto out; |
| 2417 | |
| 2418 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 2419 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2420 | if (!page) |
| 2421 | goto out; |
| 2422 | |
| 2423 | length = -EFAULT; |
| 2424 | if (copy_from_user(page, buf, count)) |
| 2425 | goto out_free; |
| 2426 | |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2427 | /* Guard against adverse ptrace interaction */ |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2428 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2429 | if (length < 0) |
| 2430 | goto out_free; |
| 2431 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2432 | length = security_setprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2433 | (char*)file->f_path.dentry->d_name.name, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2434 | (void*)page, count); |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2435 | mutex_unlock(&task->signal->cred_guard_mutex); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2436 | out_free: |
| 2437 | free_page((unsigned long) page); |
| 2438 | out: |
| 2439 | put_task_struct(task); |
| 2440 | out_no_task: |
| 2441 | return length; |
| 2442 | } |
| 2443 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2444 | static const struct file_operations proc_pid_attr_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2445 | .read = proc_pid_attr_read, |
| 2446 | .write = proc_pid_attr_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2447 | .llseek = generic_file_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2448 | }; |
| 2449 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2450 | static const struct pid_entry attr_dir_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2451 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2452 | REG("prev", S_IRUGO, proc_pid_attr_operations), |
| 2453 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2454 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2455 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2456 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2457 | }; |
| 2458 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2459 | static int proc_attr_dir_readdir(struct file * filp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2460 | void * dirent, filldir_t filldir) |
| 2461 | { |
| 2462 | return proc_pident_readdir(filp,dirent,filldir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 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 | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2466 | static const struct file_operations proc_attr_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | .read = generic_read_dir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2468 | .readdir = proc_attr_dir_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2469 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | }; |
| 2471 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2472 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | struct dentry *dentry, struct nameidata *nd) |
| 2474 | { |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2475 | return proc_pident_lookup(dir, dentry, |
| 2476 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | } |
| 2478 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2479 | static const struct inode_operations proc_attr_dir_inode_operations = { |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2480 | .lookup = proc_attr_dir_lookup, |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2481 | .getattr = pid_getattr, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2482 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2483 | }; |
| 2484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | #endif |
| 2486 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2487 | #ifdef CONFIG_ELF_CORE |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2488 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
| 2489 | size_t count, loff_t *ppos) |
| 2490 | { |
| 2491 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 2492 | struct mm_struct *mm; |
| 2493 | char buffer[PROC_NUMBUF]; |
| 2494 | size_t len; |
| 2495 | int ret; |
| 2496 | |
| 2497 | if (!task) |
| 2498 | return -ESRCH; |
| 2499 | |
| 2500 | ret = 0; |
| 2501 | mm = get_task_mm(task); |
| 2502 | if (mm) { |
| 2503 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", |
| 2504 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> |
| 2505 | MMF_DUMP_FILTER_SHIFT)); |
| 2506 | mmput(mm); |
| 2507 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 2508 | } |
| 2509 | |
| 2510 | put_task_struct(task); |
| 2511 | |
| 2512 | return ret; |
| 2513 | } |
| 2514 | |
| 2515 | static ssize_t proc_coredump_filter_write(struct file *file, |
| 2516 | const char __user *buf, |
| 2517 | size_t count, |
| 2518 | loff_t *ppos) |
| 2519 | { |
| 2520 | struct task_struct *task; |
| 2521 | struct mm_struct *mm; |
| 2522 | char buffer[PROC_NUMBUF], *end; |
| 2523 | unsigned int val; |
| 2524 | int ret; |
| 2525 | int i; |
| 2526 | unsigned long mask; |
| 2527 | |
| 2528 | ret = -EFAULT; |
| 2529 | memset(buffer, 0, sizeof(buffer)); |
| 2530 | if (count > sizeof(buffer) - 1) |
| 2531 | count = sizeof(buffer) - 1; |
| 2532 | if (copy_from_user(buffer, buf, count)) |
| 2533 | goto out_no_task; |
| 2534 | |
| 2535 | ret = -EINVAL; |
| 2536 | val = (unsigned int)simple_strtoul(buffer, &end, 0); |
| 2537 | if (*end == '\n') |
| 2538 | end++; |
| 2539 | if (end - buffer == 0) |
| 2540 | goto out_no_task; |
| 2541 | |
| 2542 | ret = -ESRCH; |
| 2543 | task = get_proc_task(file->f_dentry->d_inode); |
| 2544 | if (!task) |
| 2545 | goto out_no_task; |
| 2546 | |
| 2547 | ret = end - buffer; |
| 2548 | mm = get_task_mm(task); |
| 2549 | if (!mm) |
| 2550 | goto out_no_mm; |
| 2551 | |
| 2552 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { |
| 2553 | if (val & mask) |
| 2554 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2555 | else |
| 2556 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2557 | } |
| 2558 | |
| 2559 | mmput(mm); |
| 2560 | out_no_mm: |
| 2561 | put_task_struct(task); |
| 2562 | out_no_task: |
| 2563 | return ret; |
| 2564 | } |
| 2565 | |
| 2566 | static const struct file_operations proc_coredump_filter_operations = { |
| 2567 | .read = proc_coredump_filter_read, |
| 2568 | .write = proc_coredump_filter_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2569 | .llseek = generic_file_llseek, |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2570 | }; |
| 2571 | #endif |
| 2572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | /* |
| 2574 | * /proc/self: |
| 2575 | */ |
| 2576 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| 2577 | int buflen) |
| 2578 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2579 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2580 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2581 | char tmp[PROC_NUMBUF]; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2582 | if (!tgid) |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2583 | return -ENOENT; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2584 | sprintf(tmp, "%d", tgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2585 | return vfs_readlink(dentry,buffer,buflen,tmp); |
| 2586 | } |
| 2587 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 2588 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2589 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2590 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2591 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2592 | char *name = ERR_PTR(-ENOENT); |
| 2593 | if (tgid) { |
| 2594 | name = __getname(); |
| 2595 | if (!name) |
| 2596 | name = ERR_PTR(-ENOMEM); |
| 2597 | else |
| 2598 | sprintf(name, "%d", tgid); |
| 2599 | } |
| 2600 | nd_set_link(nd, name); |
| 2601 | return NULL; |
| 2602 | } |
| 2603 | |
| 2604 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, |
| 2605 | void *cookie) |
| 2606 | { |
| 2607 | char *s = nd_get_link(nd); |
| 2608 | if (!IS_ERR(s)) |
| 2609 | __putname(s); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2610 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2611 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2612 | static const struct inode_operations proc_self_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2613 | .readlink = proc_self_readlink, |
| 2614 | .follow_link = proc_self_follow_link, |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2615 | .put_link = proc_self_put_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2616 | }; |
| 2617 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2618 | /* |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2619 | * proc base |
| 2620 | * |
| 2621 | * These are the directory entries in the root directory of /proc |
| 2622 | * that properly belong to the /proc filesystem, as they describe |
| 2623 | * describe something that is process related. |
| 2624 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2625 | static const struct pid_entry proc_base_stuff[] = { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2626 | NOD("self", S_IFLNK|S_IRWXUGO, |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2627 | &proc_self_inode_operations, NULL, {}), |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2628 | }; |
| 2629 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2630 | static struct dentry *proc_base_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2631 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2632 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2633 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2634 | struct inode *inode; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2635 | struct proc_inode *ei; |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 2636 | struct dentry *error; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2637 | |
| 2638 | /* Allocate the inode */ |
| 2639 | error = ERR_PTR(-ENOMEM); |
| 2640 | inode = new_inode(dir->i_sb); |
| 2641 | if (!inode) |
| 2642 | goto out; |
| 2643 | |
| 2644 | /* Initialize the inode */ |
| 2645 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 2646 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2647 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2648 | |
| 2649 | /* |
| 2650 | * grab the reference to the task. |
| 2651 | */ |
Oleg Nesterov | 1a657f7 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 2652 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2653 | if (!ei->pid) |
| 2654 | goto out_iput; |
| 2655 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2656 | inode->i_mode = p->mode; |
| 2657 | if (S_ISDIR(inode->i_mode)) |
| 2658 | inode->i_nlink = 2; |
| 2659 | if (S_ISLNK(inode->i_mode)) |
| 2660 | inode->i_size = 64; |
| 2661 | if (p->iop) |
| 2662 | inode->i_op = p->iop; |
| 2663 | if (p->fop) |
| 2664 | inode->i_fop = p->fop; |
| 2665 | ei->op = p->op; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2666 | d_add(dentry, inode); |
| 2667 | error = NULL; |
| 2668 | out: |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2669 | return error; |
| 2670 | out_iput: |
| 2671 | iput(inode); |
| 2672 | goto out; |
| 2673 | } |
| 2674 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2675 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
| 2676 | { |
| 2677 | struct dentry *error; |
| 2678 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2679 | const struct pid_entry *p, *last; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2680 | |
| 2681 | error = ERR_PTR(-ENOENT); |
| 2682 | |
| 2683 | if (!task) |
| 2684 | goto out_no_task; |
| 2685 | |
| 2686 | /* Lookup the directory entry */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2687 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
| 2688 | for (p = proc_base_stuff; p <= last; p++) { |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2689 | if (p->len != dentry->d_name.len) |
| 2690 | continue; |
| 2691 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2692 | break; |
| 2693 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2694 | if (p > last) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2695 | goto out; |
| 2696 | |
| 2697 | error = proc_base_instantiate(dir, dentry, task, p); |
| 2698 | |
| 2699 | out: |
| 2700 | put_task_struct(task); |
| 2701 | out_no_task: |
| 2702 | return error; |
| 2703 | } |
| 2704 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2705 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
| 2706 | 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] | 2707 | { |
| 2708 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2709 | proc_base_instantiate, task, p); |
| 2710 | } |
| 2711 | |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2712 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2713 | 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] | 2714 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2715 | struct task_io_accounting acct = task->ioac; |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2716 | unsigned long flags; |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2717 | int result; |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2718 | |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2719 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
| 2720 | if (result) |
| 2721 | return result; |
| 2722 | |
| 2723 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) { |
| 2724 | result = -EACCES; |
| 2725 | goto out_unlock; |
| 2726 | } |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 2727 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2728 | if (whole && lock_task_sighand(task, &flags)) { |
| 2729 | struct task_struct *t = task; |
Andrea Righi | b2d002d | 2008-07-26 15:22:27 -0700 | [diff] [blame] | 2730 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2731 | task_io_accounting_add(&acct, &task->signal->ioac); |
| 2732 | while_each_thread(task, t) |
| 2733 | task_io_accounting_add(&acct, &t->ioac); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2734 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2735 | unlock_task_sighand(task, &flags); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2736 | } |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2737 | result = sprintf(buffer, |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2738 | "rchar: %llu\n" |
| 2739 | "wchar: %llu\n" |
| 2740 | "syscr: %llu\n" |
| 2741 | "syscw: %llu\n" |
| 2742 | "read_bytes: %llu\n" |
| 2743 | "write_bytes: %llu\n" |
| 2744 | "cancelled_write_bytes: %llu\n", |
Alexander Beregalov | 7c44319 | 2008-08-05 13:01:34 -0700 | [diff] [blame] | 2745 | (unsigned long long)acct.rchar, |
| 2746 | (unsigned long long)acct.wchar, |
| 2747 | (unsigned long long)acct.syscr, |
| 2748 | (unsigned long long)acct.syscw, |
| 2749 | (unsigned long long)acct.read_bytes, |
| 2750 | (unsigned long long)acct.write_bytes, |
| 2751 | (unsigned long long)acct.cancelled_write_bytes); |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2752 | out_unlock: |
| 2753 | mutex_unlock(&task->signal->cred_guard_mutex); |
| 2754 | return result; |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2755 | } |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2756 | |
| 2757 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) |
| 2758 | { |
| 2759 | return do_io_accounting(task, buffer, 0); |
| 2760 | } |
| 2761 | |
| 2762 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) |
| 2763 | { |
| 2764 | return do_io_accounting(task, buffer, 1); |
| 2765 | } |
| 2766 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2767 | |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2768 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
| 2769 | struct pid *pid, struct task_struct *task) |
| 2770 | { |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2771 | int err = lock_trace(task); |
| 2772 | if (!err) { |
| 2773 | seq_printf(m, "%08x\n", task->personality); |
| 2774 | unlock_trace(task); |
| 2775 | } |
| 2776 | return err; |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2777 | } |
| 2778 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2779 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2780 | * Thread groups |
| 2781 | */ |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2782 | static const struct file_operations proc_task_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2783 | static const struct inode_operations proc_task_inode_operations; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2784 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2785 | static const struct pid_entry tgid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2786 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
| 2787 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2788 | 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] | 2789 | 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] | 2790 | #ifdef CONFIG_NET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2791 | 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] | 2792 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2793 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2794 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2795 | ONE("status", S_IRUGO, proc_pid_status), |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2796 | ONE("personality", S_IRUGO, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 2797 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2798 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2799 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2800 | #endif |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 2801 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 2802 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), |
| 2803 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 2804 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2805 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2806 | INF("syscall", S_IRUGO, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2807 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2808 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2809 | ONE("stat", S_IRUGO, proc_tgid_stat), |
| 2810 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2811 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2812 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2813 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2814 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2815 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2816 | LNK("cwd", proc_cwd_link), |
| 2817 | LNK("root", proc_root_link), |
| 2818 | LNK("exe", proc_exe_link), |
| 2819 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2820 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
| 2821 | REG("mountstats", S_IRUSR, proc_mountstats_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2822 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2823 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2824 | REG("smaps", S_IRUGO, proc_smaps_operations), |
Al Viro | ca6b0bf | 2011-02-15 22:04:37 -0500 | [diff] [blame] | 2825 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2826 | #endif |
| 2827 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2828 | 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] | 2829 | #endif |
| 2830 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2831 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2832 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2833 | #ifdef CONFIG_STACKTRACE |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2834 | ONE("stack", S_IRUGO, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2835 | #endif |
| 2836 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2837 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2838 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2839 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2840 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2841 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2842 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2843 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2844 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2845 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2846 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2847 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2848 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2849 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 2850 | 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] | 2851 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2852 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2853 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2854 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2855 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2856 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2857 | #endif |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2858 | #ifdef CONFIG_ELF_CORE |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2859 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2860 | #endif |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2861 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 2862 | INF("io", S_IRUSR, proc_tgid_io_accounting), |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2863 | #endif |
Chris Metcalf | f133ecc | 2011-05-26 12:40:09 -0400 | [diff] [blame] | 2864 | #ifdef CONFIG_HARDWALL |
| 2865 | INF("hardwall", S_IRUGO, proc_pid_hardwall), |
| 2866 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2867 | }; |
| 2868 | |
| 2869 | static int proc_tgid_base_readdir(struct file * filp, |
| 2870 | void * dirent, filldir_t filldir) |
| 2871 | { |
| 2872 | return proc_pident_readdir(filp,dirent,filldir, |
| 2873 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
| 2874 | } |
| 2875 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2876 | static const struct file_operations proc_tgid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2877 | .read = generic_read_dir, |
| 2878 | .readdir = proc_tgid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2879 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2880 | }; |
| 2881 | |
| 2882 | 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] | 2883 | return proc_pident_lookup(dir, dentry, |
| 2884 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2885 | } |
| 2886 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2887 | static const struct inode_operations proc_tgid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2888 | .lookup = proc_tgid_base_lookup, |
| 2889 | .getattr = pid_getattr, |
| 2890 | .setattr = proc_setattr, |
| 2891 | }; |
| 2892 | |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2893 | 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] | 2894 | { |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2895 | struct dentry *dentry, *leader, *dir; |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2896 | char buf[PROC_NUMBUF]; |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2897 | struct qstr name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2898 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2899 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2900 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| 2901 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2902 | if (dentry) { |
Sukadev Bhattiprolu | 29f12ca | 2009-11-11 14:26:32 -0800 | [diff] [blame] | 2903 | shrink_dcache_parent(dentry); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2904 | d_drop(dentry); |
| 2905 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2906 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2907 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2908 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2909 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
| 2910 | leader = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2911 | if (!leader) |
| 2912 | goto out; |
| 2913 | |
| 2914 | name.name = "task"; |
| 2915 | name.len = strlen(name.name); |
| 2916 | dir = d_hash_and_lookup(leader, &name); |
| 2917 | if (!dir) |
| 2918 | goto out_put_leader; |
| 2919 | |
| 2920 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2921 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2922 | dentry = d_hash_and_lookup(dir, &name); |
| 2923 | if (dentry) { |
| 2924 | shrink_dcache_parent(dentry); |
| 2925 | d_drop(dentry); |
| 2926 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2927 | } |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2928 | |
| 2929 | dput(dir); |
| 2930 | out_put_leader: |
| 2931 | dput(leader); |
| 2932 | out: |
| 2933 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2934 | } |
| 2935 | |
Randy Dunlap | 0895e91 | 2007-10-21 21:00:10 -0700 | [diff] [blame] | 2936 | /** |
| 2937 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| 2938 | * @task: task that should be flushed. |
| 2939 | * |
| 2940 | * When flushing dentries from proc, one needs to flush them from global |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2941 | * 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] | 2942 | * in. This call is supposed to do all of this job. |
| 2943 | * |
| 2944 | * Looks in the dcache for |
| 2945 | * /proc/@pid |
| 2946 | * /proc/@tgid/task/@pid |
| 2947 | * if either directory is present flushes it and all of it'ts children |
| 2948 | * from the dcache. |
| 2949 | * |
| 2950 | * It is safe and reasonable to cache /proc entries for a task until |
| 2951 | * that task exits. After that they just clog up the dcache with |
| 2952 | * useless entries, possibly causing useful dcache entries to be |
| 2953 | * flushed instead. This routine is proved to flush those useless |
| 2954 | * dcache entries at process exit time. |
| 2955 | * |
| 2956 | * NOTE: This routine is just an optimization so it does not guarantee |
| 2957 | * that no dcache entries will exist at process exit time it |
| 2958 | * just makes it very unlikely that any will persist. |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2959 | */ |
| 2960 | |
| 2961 | void proc_flush_task(struct task_struct *task) |
| 2962 | { |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2963 | int i; |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2964 | struct pid *pid, *tgid; |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2965 | struct upid *upid; |
| 2966 | |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2967 | pid = task_pid(task); |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2968 | tgid = task_tgid(task); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2969 | |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2970 | for (i = 0; i <= pid->level; i++) { |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2971 | upid = &pid->numbers[i]; |
| 2972 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2973 | tgid->numbers[i].nr); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2974 | } |
Pavel Emelyanov | 6f4e643 | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2975 | |
| 2976 | upid = &pid->numbers[pid->level]; |
| 2977 | if (upid->nr == 1) |
| 2978 | pid_ns_release_proc(upid->ns); |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2979 | } |
| 2980 | |
Adrian Bunk | 9711ef9 | 2006-12-06 20:38:31 -0800 | [diff] [blame] | 2981 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
| 2982 | struct dentry * dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2983 | struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2984 | { |
| 2985 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2986 | struct inode *inode; |
| 2987 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2988 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2989 | if (!inode) |
| 2990 | goto out; |
| 2991 | |
| 2992 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 2993 | inode->i_op = &proc_tgid_base_inode_operations; |
| 2994 | inode->i_fop = &proc_tgid_base_operations; |
| 2995 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 2996 | |
| 2997 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, |
| 2998 | ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2999 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 3000 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3001 | |
| 3002 | d_add(dentry, inode); |
| 3003 | /* Close the race of the process dying before we return the dentry */ |
| 3004 | if (pid_revalidate(dentry, NULL)) |
| 3005 | error = NULL; |
| 3006 | out: |
| 3007 | return error; |
| 3008 | } |
| 3009 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 3011 | { |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 3012 | struct dentry *result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3013 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3014 | unsigned tgid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3015 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3016 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 3017 | result = proc_base_lookup(dir, dentry); |
| 3018 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) |
| 3019 | goto out; |
| 3020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3021 | tgid = name_to_int(dentry); |
| 3022 | if (tgid == ~0U) |
| 3023 | goto out; |
| 3024 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3025 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3026 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3027 | task = find_task_by_pid_ns(tgid, ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | if (task) |
| 3029 | get_task_struct(task); |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3030 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3031 | if (!task) |
| 3032 | goto out; |
| 3033 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3034 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 3035 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3036 | out: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 3037 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3038 | } |
| 3039 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3040 | /* |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3041 | * Find the first task with tgid >= tgid |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3042 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3043 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3044 | struct tgid_iter { |
| 3045 | unsigned int tgid; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3046 | struct task_struct *task; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3047 | }; |
| 3048 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) |
| 3049 | { |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3050 | struct pid *pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3051 | |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3052 | if (iter.task) |
| 3053 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3054 | rcu_read_lock(); |
| 3055 | retry: |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3056 | iter.task = NULL; |
| 3057 | pid = find_ge_pid(iter.tgid, ns); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3058 | if (pid) { |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3059 | iter.tgid = pid_nr_ns(pid, ns); |
| 3060 | iter.task = pid_task(pid, PIDTYPE_PID); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3061 | /* What we to know is if the pid we have find is the |
| 3062 | * pid of a thread_group_leader. Testing for task |
| 3063 | * being a thread_group_leader is the obvious thing |
| 3064 | * todo but there is a window when it fails, due to |
| 3065 | * the pid transfer logic in de_thread. |
| 3066 | * |
| 3067 | * So we perform the straight forward test of seeing |
| 3068 | * if the pid we have found is the pid of a thread |
| 3069 | * group leader, and don't worry if the task we have |
| 3070 | * found doesn't happen to be a thread group leader. |
| 3071 | * As we don't care in the case of readdir. |
| 3072 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3073 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
| 3074 | iter.tgid += 1; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3075 | goto retry; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3076 | } |
| 3077 | get_task_struct(iter.task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3078 | } |
Eric W. Biederman | 454cc10 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3079 | rcu_read_unlock(); |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3080 | return iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3081 | } |
| 3082 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 3083 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3084 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3085 | 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] | 3086 | struct tgid_iter iter) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3087 | { |
| 3088 | char name[PROC_NUMBUF]; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3089 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3090 | return proc_fill_cache(filp, dirent, filldir, name, len, |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3091 | proc_pid_instantiate, iter.task, NULL); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3092 | } |
| 3093 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3094 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
| 3095 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3096 | { |
Linus Torvalds | d8bdc59 | 2011-04-18 10:36:54 -0700 | [diff] [blame] | 3097 | unsigned int nr; |
| 3098 | struct task_struct *reaper; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3099 | struct tgid_iter iter; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3100 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3101 | |
Linus Torvalds | d8bdc59 | 2011-04-18 10:36:54 -0700 | [diff] [blame] | 3102 | if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET) |
| 3103 | goto out_no_task; |
| 3104 | nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
| 3105 | |
| 3106 | reaper = get_proc_task(filp->f_path.dentry->d_inode); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3107 | if (!reaper) |
| 3108 | goto out_no_task; |
| 3109 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 3110 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3111 | const struct pid_entry *p = &proc_base_stuff[nr]; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3112 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 3113 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3114 | } |
| 3115 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3116 | ns = filp->f_dentry->d_sb->s_fs_info; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3117 | iter.task = NULL; |
| 3118 | iter.tgid = filp->f_pos - TGID_OFFSET; |
| 3119 | for (iter = next_tgid(ns, iter); |
| 3120 | iter.task; |
| 3121 | iter.tgid += 1, iter = next_tgid(ns, iter)) { |
| 3122 | filp->f_pos = iter.tgid + TGID_OFFSET; |
| 3123 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { |
| 3124 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3125 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3126 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | } |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3128 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
| 3129 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3130 | put_task_struct(reaper); |
| 3131 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | return 0; |
| 3133 | } |
| 3134 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3135 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3136 | * Tasks |
| 3137 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3138 | static const struct pid_entry tid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3139 | 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] | 3140 | 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] | 3141 | 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] | 3142 | REG("environ", S_IRUSR, proc_environ_operations), |
| 3143 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 3144 | ONE("status", S_IRUGO, proc_pid_status), |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3145 | ONE("personality", S_IRUGO, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 3146 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3147 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3148 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3149 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 3150 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3151 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3152 | INF("syscall", S_IRUGO, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3153 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3154 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 3155 | ONE("stat", S_IRUGO, proc_tid_stat), |
| 3156 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 3157 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3158 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3159 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3160 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3161 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 3162 | LNK("cwd", proc_cwd_link), |
| 3163 | LNK("root", proc_root_link), |
| 3164 | LNK("exe", proc_exe_link), |
| 3165 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 3166 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 3167 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3168 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 3169 | REG("smaps", S_IRUGO, proc_smaps_operations), |
Al Viro | ca6b0bf | 2011-02-15 22:04:37 -0500 | [diff] [blame] | 3170 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3171 | #endif |
| 3172 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3173 | 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] | 3174 | #endif |
| 3175 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3176 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3177 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 3178 | #ifdef CONFIG_STACKTRACE |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3179 | ONE("stack", S_IRUGO, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3180 | #endif |
| 3181 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3182 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3183 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3184 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3185 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3186 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 3187 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3188 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3189 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3190 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3191 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3192 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3193 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 3194 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 3195 | 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] | 3196 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3197 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
Al Viro | 26ec3c6 | 2011-02-15 21:24:05 -0500 | [diff] [blame] | 3198 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3199 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3200 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3201 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3202 | #endif |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3203 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 3204 | INF("io", S_IRUSR, proc_tid_io_accounting), |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3205 | #endif |
Chris Metcalf | f133ecc | 2011-05-26 12:40:09 -0400 | [diff] [blame] | 3206 | #ifdef CONFIG_HARDWALL |
| 3207 | INF("hardwall", S_IRUGO, proc_pid_hardwall), |
| 3208 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3209 | }; |
| 3210 | |
| 3211 | static int proc_tid_base_readdir(struct file * filp, |
| 3212 | void * dirent, filldir_t filldir) |
| 3213 | { |
| 3214 | return proc_pident_readdir(filp,dirent,filldir, |
| 3215 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); |
| 3216 | } |
| 3217 | |
| 3218 | 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] | 3219 | return proc_pident_lookup(dir, dentry, |
| 3220 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3221 | } |
| 3222 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3223 | static const struct file_operations proc_tid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3224 | .read = generic_read_dir, |
| 3225 | .readdir = proc_tid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3226 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3227 | }; |
| 3228 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3229 | static const struct inode_operations proc_tid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3230 | .lookup = proc_tid_base_lookup, |
| 3231 | .getattr = pid_getattr, |
| 3232 | .setattr = proc_setattr, |
| 3233 | }; |
| 3234 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3235 | static struct dentry *proc_task_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3236 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3237 | { |
| 3238 | struct dentry *error = ERR_PTR(-ENOENT); |
| 3239 | struct inode *inode; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3240 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3241 | |
| 3242 | if (!inode) |
| 3243 | goto out; |
| 3244 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 3245 | inode->i_op = &proc_tid_base_inode_operations; |
| 3246 | inode->i_fop = &proc_tid_base_operations; |
| 3247 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 3248 | |
| 3249 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, |
| 3250 | ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3251 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 3252 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3253 | |
| 3254 | d_add(dentry, inode); |
| 3255 | /* Close the race of the process dying before we return the dentry */ |
| 3256 | if (pid_revalidate(dentry, NULL)) |
| 3257 | error = NULL; |
| 3258 | out: |
| 3259 | return error; |
| 3260 | } |
| 3261 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3262 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 3263 | { |
| 3264 | struct dentry *result = ERR_PTR(-ENOENT); |
| 3265 | struct task_struct *task; |
| 3266 | struct task_struct *leader = get_proc_task(dir); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3267 | unsigned tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3268 | struct pid_namespace *ns; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3269 | |
| 3270 | if (!leader) |
| 3271 | goto out_no_task; |
| 3272 | |
| 3273 | tid = name_to_int(dentry); |
| 3274 | if (tid == ~0U) |
| 3275 | goto out; |
| 3276 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3277 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3278 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3279 | task = find_task_by_pid_ns(tid, ns); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3280 | if (task) |
| 3281 | get_task_struct(task); |
| 3282 | rcu_read_unlock(); |
| 3283 | if (!task) |
| 3284 | goto out; |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 3285 | if (!same_thread_group(leader, task)) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3286 | goto out_drop_task; |
| 3287 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3288 | result = proc_task_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3289 | out_drop_task: |
| 3290 | put_task_struct(task); |
| 3291 | out: |
| 3292 | put_task_struct(leader); |
| 3293 | out_no_task: |
| 3294 | return result; |
| 3295 | } |
| 3296 | |
| 3297 | /* |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3298 | * Find the first tid of a thread group to return to user space. |
| 3299 | * |
| 3300 | * Usually this is just the thread group leader, but if the users |
| 3301 | * buffer was too small or there was a seek into the middle of the |
| 3302 | * directory we have more work todo. |
| 3303 | * |
| 3304 | * In the case of a short read we start with find_task_by_pid. |
| 3305 | * |
| 3306 | * In the case of a seek we start with the leader and walk nr |
| 3307 | * threads past it. |
| 3308 | */ |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3309 | static struct task_struct *first_tid(struct task_struct *leader, |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3310 | int tid, int nr, struct pid_namespace *ns) |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3311 | { |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3312 | struct task_struct *pos; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3313 | |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3314 | rcu_read_lock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3315 | /* Attempt to start with the pid of a thread */ |
| 3316 | if (tid && (nr > 0)) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3317 | pos = find_task_by_pid_ns(tid, ns); |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3318 | if (pos && (pos->group_leader == leader)) |
| 3319 | goto found; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3320 | } |
| 3321 | |
| 3322 | /* If nr exceeds the number of threads there is nothing todo */ |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3323 | pos = NULL; |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3324 | if (nr && nr >= get_nr_threads(leader)) |
| 3325 | goto out; |
| 3326 | |
| 3327 | /* If we haven't found our starting place yet start |
| 3328 | * with the leader and walk nr threads forward. |
| 3329 | */ |
| 3330 | for (pos = leader; nr > 0; --nr) { |
| 3331 | pos = next_thread(pos); |
| 3332 | if (pos == leader) { |
| 3333 | pos = NULL; |
| 3334 | goto out; |
| 3335 | } |
| 3336 | } |
| 3337 | found: |
| 3338 | get_task_struct(pos); |
| 3339 | out: |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3340 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3341 | return pos; |
| 3342 | } |
| 3343 | |
| 3344 | /* |
| 3345 | * Find the next thread in the thread list. |
| 3346 | * Return NULL if there is an error or no next thread. |
| 3347 | * |
| 3348 | * The reference to the input task_struct is released. |
| 3349 | */ |
| 3350 | static struct task_struct *next_tid(struct task_struct *start) |
| 3351 | { |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3352 | struct task_struct *pos = NULL; |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3353 | rcu_read_lock(); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3354 | if (pid_alive(start)) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3355 | pos = next_thread(start); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3356 | if (thread_group_leader(pos)) |
| 3357 | pos = NULL; |
| 3358 | else |
| 3359 | get_task_struct(pos); |
| 3360 | } |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3361 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3362 | put_task_struct(start); |
| 3363 | return pos; |
| 3364 | } |
| 3365 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3366 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 3367 | struct task_struct *task, int tid) |
| 3368 | { |
| 3369 | char name[PROC_NUMBUF]; |
| 3370 | int len = snprintf(name, sizeof(name), "%d", tid); |
| 3371 | return proc_fill_cache(filp, dirent, filldir, name, len, |
| 3372 | proc_task_instantiate, task, NULL); |
| 3373 | } |
| 3374 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3375 | /* for the /proc/TGID/task/ directories */ |
| 3376 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3377 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 3378 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3379 | struct inode *inode = dentry->d_inode; |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3380 | struct task_struct *leader = NULL; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3381 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3382 | int retval = -ENOENT; |
| 3383 | ino_t ino; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3384 | int tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3385 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3386 | |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3387 | task = get_proc_task(inode); |
| 3388 | if (!task) |
| 3389 | goto out_no_task; |
| 3390 | rcu_read_lock(); |
| 3391 | if (pid_alive(task)) { |
| 3392 | leader = task->group_leader; |
| 3393 | get_task_struct(leader); |
| 3394 | } |
| 3395 | rcu_read_unlock(); |
| 3396 | put_task_struct(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3397 | if (!leader) |
| 3398 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3399 | retval = 0; |
| 3400 | |
Linus Torvalds | ee568b2 | 2009-03-17 10:02:35 -0700 | [diff] [blame] | 3401 | switch ((unsigned long)filp->f_pos) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3402 | case 0: |
| 3403 | ino = inode->i_ino; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3404 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3405 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3406 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3407 | /* fall through */ |
| 3408 | case 1: |
| 3409 | ino = parent_ino(dentry); |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3410 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3411 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3412 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3413 | /* fall through */ |
| 3414 | } |
| 3415 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3416 | /* f_version caches the tgid value that the last readdir call couldn't |
| 3417 | * return. lseek aka telldir automagically resets f_version to 0. |
| 3418 | */ |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3419 | ns = filp->f_dentry->d_sb->s_fs_info; |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3420 | tid = (int)filp->f_version; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3421 | filp->f_version = 0; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3422 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3423 | task; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3424 | task = next_tid(task), filp->f_pos++) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3425 | tid = task_pid_nr_ns(task, ns); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3426 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3427 | /* returning this tgid failed, save it as the first |
| 3428 | * pid for the next readir call */ |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3429 | filp->f_version = (u64)tid; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3430 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3431 | break; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3432 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3433 | } |
| 3434 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3435 | put_task_struct(leader); |
| 3436 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3437 | return retval; |
| 3438 | } |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3439 | |
| 3440 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 3441 | { |
| 3442 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3443 | struct task_struct *p = get_proc_task(inode); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3444 | generic_fillattr(inode, stat); |
| 3445 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3446 | if (p) { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3447 | stat->nlink += get_nr_threads(p); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3448 | put_task_struct(p); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3449 | } |
| 3450 | |
| 3451 | return 0; |
| 3452 | } |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3453 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3454 | static const struct inode_operations proc_task_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3455 | .lookup = proc_task_lookup, |
| 3456 | .getattr = proc_task_getattr, |
| 3457 | .setattr = proc_setattr, |
| 3458 | }; |
| 3459 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3460 | static const struct file_operations proc_task_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3461 | .read = generic_read_dir, |
| 3462 | .readdir = proc_task_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3463 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3464 | }; |