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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
| 635 | |
| 636 | static ssize_t proc_info_read(struct file * file, char __user * buf, |
| 637 | size_t count, loff_t *ppos) |
| 638 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 639 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | unsigned long page; |
| 641 | ssize_t length; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 642 | struct task_struct *task = get_proc_task(inode); |
| 643 | |
| 644 | length = -ESRCH; |
| 645 | if (!task) |
| 646 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | |
| 648 | if (count > PROC_BLOCK_SIZE) |
| 649 | count = PROC_BLOCK_SIZE; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 650 | |
| 651 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 652 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 653 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | length = PROC_I(inode)->op.proc_read(task, (char*)page); |
| 656 | |
| 657 | if (length >= 0) |
| 658 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); |
| 659 | free_page(page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 660 | out: |
| 661 | put_task_struct(task); |
| 662 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | return length; |
| 664 | } |
| 665 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 666 | static const struct file_operations proc_info_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | .read = proc_info_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 668 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | }; |
| 670 | |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 671 | static int proc_single_show(struct seq_file *m, void *v) |
| 672 | { |
| 673 | struct inode *inode = m->private; |
| 674 | struct pid_namespace *ns; |
| 675 | struct pid *pid; |
| 676 | struct task_struct *task; |
| 677 | int ret; |
| 678 | |
| 679 | ns = inode->i_sb->s_fs_info; |
| 680 | pid = proc_pid(inode); |
| 681 | task = get_pid_task(pid, PIDTYPE_PID); |
| 682 | if (!task) |
| 683 | return -ESRCH; |
| 684 | |
| 685 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); |
| 686 | |
| 687 | put_task_struct(task); |
| 688 | return ret; |
| 689 | } |
| 690 | |
| 691 | static int proc_single_open(struct inode *inode, struct file *filp) |
| 692 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 693 | return single_open(filp, proc_single_show, inode); |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 694 | } |
| 695 | |
| 696 | static const struct file_operations proc_single_file_operations = { |
| 697 | .open = proc_single_open, |
| 698 | .read = seq_read, |
| 699 | .llseek = seq_lseek, |
| 700 | .release = single_release, |
| 701 | }; |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | static int mem_open(struct inode* inode, struct file* file) |
| 704 | { |
| 705 | file->private_data = (void*)((long)current->self_exec_id); |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 706 | /* OK to pass negative loff_t, we can catch out-of-range */ |
| 707 | file->f_mode |= FMODE_UNSIGNED_OFFSET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | return 0; |
| 709 | } |
| 710 | |
| 711 | static ssize_t mem_read(struct file * file, char __user * buf, |
| 712 | size_t count, loff_t *ppos) |
| 713 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 714 | 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] | 715 | char *page; |
| 716 | unsigned long src = *ppos; |
| 717 | int ret = -ESRCH; |
| 718 | struct mm_struct *mm; |
| 719 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 720 | if (!task) |
| 721 | goto out_no_task; |
| 722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | ret = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 724 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | if (!page) |
| 726 | goto out; |
| 727 | |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 728 | mm = check_mem_permission(task); |
| 729 | ret = PTR_ERR(mm); |
| 730 | if (IS_ERR(mm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | goto out_free; |
| 732 | |
| 733 | ret = -EIO; |
| 734 | |
| 735 | if (file->private_data != (void*)((long)current->self_exec_id)) |
| 736 | goto out_put; |
| 737 | |
| 738 | ret = 0; |
| 739 | |
| 740 | while (count > 0) { |
| 741 | int this_len, retval; |
| 742 | |
| 743 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 744 | retval = access_remote_vm(mm, src, page, this_len, 0); |
| 745 | if (!retval) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | if (!ret) |
| 747 | ret = -EIO; |
| 748 | break; |
| 749 | } |
| 750 | |
| 751 | if (copy_to_user(buf, page, retval)) { |
| 752 | ret = -EFAULT; |
| 753 | break; |
| 754 | } |
| 755 | |
| 756 | ret += retval; |
| 757 | src += retval; |
| 758 | buf += retval; |
| 759 | count -= retval; |
| 760 | } |
| 761 | *ppos = src; |
| 762 | |
| 763 | out_put: |
| 764 | mmput(mm); |
| 765 | out_free: |
| 766 | free_page((unsigned long) page); |
| 767 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 768 | put_task_struct(task); |
| 769 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | return ret; |
| 771 | } |
| 772 | |
Glauber de Oliveira Costa | 63967fa | 2007-02-20 13:58:12 -0800 | [diff] [blame] | 773 | static ssize_t mem_write(struct file * file, const char __user *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | size_t count, loff_t *ppos) |
| 775 | { |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 776 | int copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | char *page; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 778 | 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] | 779 | unsigned long dst = *ppos; |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 780 | struct mm_struct *mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 782 | copied = -ESRCH; |
| 783 | if (!task) |
| 784 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 786 | copied = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 787 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | if (!page) |
KOSAKI Motohiro | 30cd890 | 2011-05-26 16:25:52 -0700 | [diff] [blame] | 789 | goto out_task; |
| 790 | |
| 791 | mm = check_mem_permission(task); |
| 792 | copied = PTR_ERR(mm); |
| 793 | if (IS_ERR(mm)) |
| 794 | goto out_free; |
| 795 | |
| 796 | copied = -EIO; |
| 797 | if (file->private_data != (void *)((long)current->self_exec_id)) |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 798 | goto out_mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 800 | copied = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | while (count > 0) { |
| 802 | int this_len, retval; |
| 803 | |
| 804 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 805 | if (copy_from_user(page, buf, this_len)) { |
| 806 | copied = -EFAULT; |
| 807 | break; |
| 808 | } |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 809 | retval = access_remote_vm(mm, dst, page, this_len, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | if (!retval) { |
| 811 | if (!copied) |
| 812 | copied = -EIO; |
| 813 | break; |
| 814 | } |
| 815 | copied += retval; |
| 816 | buf += retval; |
| 817 | dst += retval; |
| 818 | count -= retval; |
| 819 | } |
| 820 | *ppos = dst; |
KOSAKI Motohiro | 30cd890 | 2011-05-26 16:25:52 -0700 | [diff] [blame] | 821 | |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 822 | out_mm: |
| 823 | mmput(mm); |
KOSAKI Motohiro | 30cd890 | 2011-05-26 16:25:52 -0700 | [diff] [blame] | 824 | out_free: |
| 825 | free_page((unsigned long) page); |
Stephen Wilson | 8b0db9d | 2011-03-13 15:49:23 -0400 | [diff] [blame] | 826 | out_task: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 827 | put_task_struct(task); |
| 828 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | return copied; |
| 830 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 832 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | { |
| 834 | switch (orig) { |
| 835 | case 0: |
| 836 | file->f_pos = offset; |
| 837 | break; |
| 838 | case 1: |
| 839 | file->f_pos += offset; |
| 840 | break; |
| 841 | default: |
| 842 | return -EINVAL; |
| 843 | } |
| 844 | force_successful_syscall_return(); |
| 845 | return file->f_pos; |
| 846 | } |
| 847 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 848 | static const struct file_operations proc_mem_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | .llseek = mem_lseek, |
| 850 | .read = mem_read, |
| 851 | .write = mem_write, |
| 852 | .open = mem_open, |
| 853 | }; |
| 854 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 855 | static ssize_t environ_read(struct file *file, char __user *buf, |
| 856 | size_t count, loff_t *ppos) |
| 857 | { |
| 858 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 859 | char *page; |
| 860 | unsigned long src = *ppos; |
| 861 | int ret = -ESRCH; |
| 862 | struct mm_struct *mm; |
| 863 | |
| 864 | if (!task) |
| 865 | goto out_no_task; |
| 866 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 867 | ret = -ENOMEM; |
| 868 | page = (char *)__get_free_page(GFP_TEMPORARY); |
| 869 | if (!page) |
| 870 | goto out; |
| 871 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 872 | |
Al Viro | d6f64b8 | 2011-02-15 22:26:01 -0500 | [diff] [blame] | 873 | mm = mm_for_maps(task); |
| 874 | ret = PTR_ERR(mm); |
| 875 | if (!mm || IS_ERR(mm)) |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 876 | goto out_free; |
| 877 | |
Al Viro | d6f64b8 | 2011-02-15 22:26:01 -0500 | [diff] [blame] | 878 | ret = 0; |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 879 | while (count > 0) { |
| 880 | int this_len, retval, max_len; |
| 881 | |
| 882 | this_len = mm->env_end - (mm->env_start + src); |
| 883 | |
| 884 | if (this_len <= 0) |
| 885 | break; |
| 886 | |
| 887 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 888 | this_len = (this_len > max_len) ? max_len : this_len; |
| 889 | |
| 890 | retval = access_process_vm(task, (mm->env_start + src), |
| 891 | page, this_len, 0); |
| 892 | |
| 893 | if (retval <= 0) { |
| 894 | ret = retval; |
| 895 | break; |
| 896 | } |
| 897 | |
| 898 | if (copy_to_user(buf, page, retval)) { |
| 899 | ret = -EFAULT; |
| 900 | break; |
| 901 | } |
| 902 | |
| 903 | ret += retval; |
| 904 | src += retval; |
| 905 | buf += retval; |
| 906 | count -= retval; |
| 907 | } |
| 908 | *ppos = src; |
| 909 | |
| 910 | mmput(mm); |
| 911 | out_free: |
| 912 | free_page((unsigned long) page); |
| 913 | out: |
| 914 | put_task_struct(task); |
| 915 | out_no_task: |
| 916 | return ret; |
| 917 | } |
| 918 | |
| 919 | static const struct file_operations proc_environ_operations = { |
| 920 | .read = environ_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 921 | .llseek = generic_file_llseek, |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 922 | }; |
| 923 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
| 925 | size_t count, loff_t *ppos) |
| 926 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 927 | 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] | 928 | char buffer[PROC_NUMBUF]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | size_t len; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 930 | int oom_adjust = OOM_DISABLE; |
| 931 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 933 | if (!task) |
| 934 | return -ESRCH; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 935 | |
| 936 | if (lock_task_sighand(task, &flags)) { |
| 937 | oom_adjust = task->signal->oom_adj; |
| 938 | unlock_task_sighand(task, &flags); |
| 939 | } |
| 940 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 941 | put_task_struct(task); |
| 942 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 943 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 944 | |
| 945 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
| 948 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, |
| 949 | size_t count, loff_t *ppos) |
| 950 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 951 | struct task_struct *task; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 952 | char buffer[PROC_NUMBUF]; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 953 | int oom_adjust; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 954 | unsigned long flags; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 955 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 957 | memset(buffer, 0, sizeof(buffer)); |
| 958 | if (count > sizeof(buffer) - 1) |
| 959 | count = sizeof(buffer) - 1; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 960 | if (copy_from_user(buffer, buf, count)) { |
| 961 | err = -EFAULT; |
| 962 | goto out; |
| 963 | } |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 964 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 965 | err = kstrtoint(strstrip(buffer), 0, &oom_adjust); |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 966 | if (err) |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 967 | goto out; |
Alexey Dobriyan | 8ac773b | 2006-10-19 23:28:32 -0700 | [diff] [blame] | 968 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 969 | oom_adjust != OOM_DISABLE) { |
| 970 | err = -EINVAL; |
| 971 | goto out; |
| 972 | } |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 973 | |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 974 | task = get_proc_task(file->f_path.dentry->d_inode); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 975 | if (!task) { |
| 976 | err = -ESRCH; |
| 977 | goto out; |
| 978 | } |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 979 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 980 | task_lock(task); |
| 981 | if (!task->mm) { |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 982 | err = -EINVAL; |
| 983 | goto err_task_lock; |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 984 | } |
| 985 | |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 986 | if (!lock_task_sighand(task, &flags)) { |
| 987 | err = -ESRCH; |
| 988 | goto err_task_lock; |
| 989 | } |
| 990 | |
| 991 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { |
| 992 | err = -EACCES; |
| 993 | goto err_sighand; |
| 994 | } |
| 995 | |
David Rientjes | 51b1bd2 | 2010-08-09 17:19:47 -0700 | [diff] [blame] | 996 | /* |
| 997 | * Warn that /proc/pid/oom_adj is deprecated, see |
| 998 | * Documentation/feature-removal-schedule.txt. |
| 999 | */ |
Linus Torvalds | c214270 | 2011-08-06 11:43:08 -0700 | [diff] [blame] | 1000 | 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] | 1001 | current->comm, task_pid_nr(current), task_pid_nr(task), |
| 1002 | task_pid_nr(task)); |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1003 | task->signal->oom_adj = oom_adjust; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1004 | /* |
| 1005 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum |
| 1006 | * value is always attainable. |
| 1007 | */ |
| 1008 | if (task->signal->oom_adj == OOM_ADJUST_MAX) |
| 1009 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; |
| 1010 | else |
| 1011 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / |
| 1012 | -OOM_DISABLE; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1013 | err_sighand: |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1014 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1015 | err_task_lock: |
| 1016 | task_unlock(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1017 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1018 | out: |
| 1019 | return err < 0 ? err : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | } |
| 1021 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1022 | static const struct file_operations proc_oom_adjust_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | .read = oom_adjust_read, |
| 1024 | .write = oom_adjust_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1025 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | }; |
| 1027 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1028 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
| 1029 | size_t count, loff_t *ppos) |
| 1030 | { |
| 1031 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
| 1032 | char buffer[PROC_NUMBUF]; |
| 1033 | int oom_score_adj = OOM_SCORE_ADJ_MIN; |
| 1034 | unsigned long flags; |
| 1035 | size_t len; |
| 1036 | |
| 1037 | if (!task) |
| 1038 | return -ESRCH; |
| 1039 | if (lock_task_sighand(task, &flags)) { |
| 1040 | oom_score_adj = task->signal->oom_score_adj; |
| 1041 | unlock_task_sighand(task, &flags); |
| 1042 | } |
| 1043 | put_task_struct(task); |
| 1044 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); |
| 1045 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 1046 | } |
| 1047 | |
| 1048 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, |
| 1049 | size_t count, loff_t *ppos) |
| 1050 | { |
| 1051 | struct task_struct *task; |
| 1052 | char buffer[PROC_NUMBUF]; |
| 1053 | unsigned long flags; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1054 | int oom_score_adj; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1055 | int err; |
| 1056 | |
| 1057 | memset(buffer, 0, sizeof(buffer)); |
| 1058 | if (count > sizeof(buffer) - 1) |
| 1059 | count = sizeof(buffer) - 1; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1060 | if (copy_from_user(buffer, buf, count)) { |
| 1061 | err = -EFAULT; |
| 1062 | goto out; |
| 1063 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1064 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1065 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1066 | if (err) |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1067 | goto out; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1068 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1069 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
| 1070 | err = -EINVAL; |
| 1071 | goto out; |
| 1072 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1073 | |
| 1074 | task = get_proc_task(file->f_path.dentry->d_inode); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1075 | if (!task) { |
| 1076 | err = -ESRCH; |
| 1077 | goto out; |
| 1078 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1079 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1080 | task_lock(task); |
| 1081 | if (!task->mm) { |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1082 | err = -EINVAL; |
| 1083 | goto err_task_lock; |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1084 | } |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1085 | |
| 1086 | if (!lock_task_sighand(task, &flags)) { |
| 1087 | err = -ESRCH; |
| 1088 | goto err_task_lock; |
| 1089 | } |
| 1090 | |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 1091 | if (oom_score_adj < task->signal->oom_score_adj_min && |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1092 | !capable(CAP_SYS_RESOURCE)) { |
| 1093 | err = -EACCES; |
| 1094 | goto err_sighand; |
| 1095 | } |
| 1096 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1097 | task->signal->oom_score_adj = oom_score_adj; |
Mandeep Singh Baines | dabb16f | 2011-01-13 15:46:05 -0800 | [diff] [blame] | 1098 | if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) |
| 1099 | task->signal->oom_score_adj_min = oom_score_adj; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1100 | /* |
| 1101 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is |
| 1102 | * always attainable. |
| 1103 | */ |
| 1104 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1105 | task->signal->oom_adj = OOM_DISABLE; |
| 1106 | else |
| 1107 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / |
| 1108 | OOM_SCORE_ADJ_MAX; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1109 | err_sighand: |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1110 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1111 | err_task_lock: |
| 1112 | task_unlock(task); |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1113 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1114 | out: |
| 1115 | return err < 0 ? err : count; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1116 | } |
| 1117 | |
| 1118 | static const struct file_operations proc_oom_score_adj_operations = { |
| 1119 | .read = oom_score_adj_read, |
| 1120 | .write = oom_score_adj_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1121 | .llseek = default_llseek, |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1122 | }; |
| 1123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | #ifdef CONFIG_AUDITSYSCALL |
| 1125 | #define TMPBUFLEN 21 |
| 1126 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
| 1127 | size_t count, loff_t *ppos) |
| 1128 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1129 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1130 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | ssize_t length; |
| 1132 | char tmpbuf[TMPBUFLEN]; |
| 1133 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1134 | if (!task) |
| 1135 | return -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
Al Viro | 0c11b94 | 2008-01-10 04:20:52 -0500 | [diff] [blame] | 1137 | audit_get_loginuid(task)); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1138 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1140 | } |
| 1141 | |
| 1142 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, |
| 1143 | size_t count, loff_t *ppos) |
| 1144 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1145 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | char *page, *tmp; |
| 1147 | ssize_t length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | uid_t loginuid; |
| 1149 | |
| 1150 | if (!capable(CAP_AUDIT_CONTROL)) |
| 1151 | return -EPERM; |
| 1152 | |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1153 | rcu_read_lock(); |
| 1154 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { |
| 1155 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | return -EPERM; |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1157 | } |
| 1158 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1160 | if (count >= PAGE_SIZE) |
| 1161 | count = PAGE_SIZE - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
| 1163 | if (*ppos != 0) { |
| 1164 | /* No partial writes. */ |
| 1165 | return -EINVAL; |
| 1166 | } |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1167 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | if (!page) |
| 1169 | return -ENOMEM; |
| 1170 | length = -EFAULT; |
| 1171 | if (copy_from_user(page, buf, count)) |
| 1172 | goto out_free_page; |
| 1173 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1174 | page[count] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | loginuid = simple_strtoul(page, &tmp, 10); |
| 1176 | if (tmp == page) { |
| 1177 | length = -EINVAL; |
| 1178 | goto out_free_page; |
| 1179 | |
| 1180 | } |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1181 | length = audit_set_loginuid(current, loginuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | if (likely(length == 0)) |
| 1183 | length = count; |
| 1184 | |
| 1185 | out_free_page: |
| 1186 | free_page((unsigned long) page); |
| 1187 | return length; |
| 1188 | } |
| 1189 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1190 | static const struct file_operations proc_loginuid_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | .read = proc_loginuid_read, |
| 1192 | .write = proc_loginuid_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1193 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | }; |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1195 | |
| 1196 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, |
| 1197 | size_t count, loff_t *ppos) |
| 1198 | { |
| 1199 | struct inode * inode = file->f_path.dentry->d_inode; |
| 1200 | struct task_struct *task = get_proc_task(inode); |
| 1201 | ssize_t length; |
| 1202 | char tmpbuf[TMPBUFLEN]; |
| 1203 | |
| 1204 | if (!task) |
| 1205 | return -ESRCH; |
| 1206 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| 1207 | audit_get_sessionid(task)); |
| 1208 | put_task_struct(task); |
| 1209 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1210 | } |
| 1211 | |
| 1212 | static const struct file_operations proc_sessionid_operations = { |
| 1213 | .read = proc_sessionid_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1214 | .llseek = generic_file_llseek, |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1215 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | #endif |
| 1217 | |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1218 | #ifdef CONFIG_FAULT_INJECTION |
| 1219 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, |
| 1220 | size_t count, loff_t *ppos) |
| 1221 | { |
| 1222 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 1223 | char buffer[PROC_NUMBUF]; |
| 1224 | size_t len; |
| 1225 | int make_it_fail; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1226 | |
| 1227 | if (!task) |
| 1228 | return -ESRCH; |
| 1229 | make_it_fail = task->make_it_fail; |
| 1230 | put_task_struct(task); |
| 1231 | |
| 1232 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1233 | |
| 1234 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1235 | } |
| 1236 | |
| 1237 | static ssize_t proc_fault_inject_write(struct file * file, |
| 1238 | const char __user * buf, size_t count, loff_t *ppos) |
| 1239 | { |
| 1240 | struct task_struct *task; |
| 1241 | char buffer[PROC_NUMBUF], *end; |
| 1242 | int make_it_fail; |
| 1243 | |
| 1244 | if (!capable(CAP_SYS_RESOURCE)) |
| 1245 | return -EPERM; |
| 1246 | memset(buffer, 0, sizeof(buffer)); |
| 1247 | if (count > sizeof(buffer) - 1) |
| 1248 | count = sizeof(buffer) - 1; |
| 1249 | if (copy_from_user(buffer, buf, count)) |
| 1250 | return -EFAULT; |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1251 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
| 1252 | if (*end) |
| 1253 | return -EINVAL; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1254 | task = get_proc_task(file->f_dentry->d_inode); |
| 1255 | if (!task) |
| 1256 | return -ESRCH; |
| 1257 | task->make_it_fail = make_it_fail; |
| 1258 | put_task_struct(task); |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1259 | |
| 1260 | return count; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1261 | } |
| 1262 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1263 | static const struct file_operations proc_fault_inject_operations = { |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1264 | .read = proc_fault_inject_read, |
| 1265 | .write = proc_fault_inject_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1266 | .llseek = generic_file_llseek, |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1267 | }; |
| 1268 | #endif |
| 1269 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1270 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1271 | #ifdef CONFIG_SCHED_DEBUG |
| 1272 | /* |
| 1273 | * Print out various scheduling related per-task fields: |
| 1274 | */ |
| 1275 | static int sched_show(struct seq_file *m, void *v) |
| 1276 | { |
| 1277 | struct inode *inode = m->private; |
| 1278 | struct task_struct *p; |
| 1279 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1280 | p = get_proc_task(inode); |
| 1281 | if (!p) |
| 1282 | return -ESRCH; |
| 1283 | proc_sched_show_task(p, m); |
| 1284 | |
| 1285 | put_task_struct(p); |
| 1286 | |
| 1287 | return 0; |
| 1288 | } |
| 1289 | |
| 1290 | static ssize_t |
| 1291 | sched_write(struct file *file, const char __user *buf, |
| 1292 | size_t count, loff_t *offset) |
| 1293 | { |
| 1294 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1295 | struct task_struct *p; |
| 1296 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1297 | p = get_proc_task(inode); |
| 1298 | if (!p) |
| 1299 | return -ESRCH; |
| 1300 | proc_sched_set_task(p); |
| 1301 | |
| 1302 | put_task_struct(p); |
| 1303 | |
| 1304 | return count; |
| 1305 | } |
| 1306 | |
| 1307 | static int sched_open(struct inode *inode, struct file *filp) |
| 1308 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 1309 | return single_open(filp, sched_show, inode); |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1310 | } |
| 1311 | |
| 1312 | static const struct file_operations proc_pid_sched_operations = { |
| 1313 | .open = sched_open, |
| 1314 | .read = seq_read, |
| 1315 | .write = sched_write, |
| 1316 | .llseek = seq_lseek, |
Alexey Dobriyan | 5ea473a | 2007-07-31 00:38:50 -0700 | [diff] [blame] | 1317 | .release = single_release, |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1318 | }; |
| 1319 | |
| 1320 | #endif |
| 1321 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1322 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 1323 | /* |
| 1324 | * Print out autogroup related information: |
| 1325 | */ |
| 1326 | static int sched_autogroup_show(struct seq_file *m, void *v) |
| 1327 | { |
| 1328 | struct inode *inode = m->private; |
| 1329 | struct task_struct *p; |
| 1330 | |
| 1331 | p = get_proc_task(inode); |
| 1332 | if (!p) |
| 1333 | return -ESRCH; |
| 1334 | proc_sched_autogroup_show_task(p, m); |
| 1335 | |
| 1336 | put_task_struct(p); |
| 1337 | |
| 1338 | return 0; |
| 1339 | } |
| 1340 | |
| 1341 | static ssize_t |
| 1342 | sched_autogroup_write(struct file *file, const char __user *buf, |
| 1343 | size_t count, loff_t *offset) |
| 1344 | { |
| 1345 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1346 | struct task_struct *p; |
| 1347 | char buffer[PROC_NUMBUF]; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1348 | int nice; |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1349 | int err; |
| 1350 | |
| 1351 | memset(buffer, 0, sizeof(buffer)); |
| 1352 | if (count > sizeof(buffer) - 1) |
| 1353 | count = sizeof(buffer) - 1; |
| 1354 | if (copy_from_user(buffer, buf, count)) |
| 1355 | return -EFAULT; |
| 1356 | |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1357 | err = kstrtoint(strstrip(buffer), 0, &nice); |
| 1358 | if (err < 0) |
| 1359 | return err; |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1360 | |
| 1361 | p = get_proc_task(inode); |
| 1362 | if (!p) |
| 1363 | return -ESRCH; |
| 1364 | |
| 1365 | err = nice; |
| 1366 | err = proc_sched_autogroup_set_nice(p, &err); |
| 1367 | if (err) |
| 1368 | count = err; |
| 1369 | |
| 1370 | put_task_struct(p); |
| 1371 | |
| 1372 | return count; |
| 1373 | } |
| 1374 | |
| 1375 | static int sched_autogroup_open(struct inode *inode, struct file *filp) |
| 1376 | { |
| 1377 | int ret; |
| 1378 | |
| 1379 | ret = single_open(filp, sched_autogroup_show, NULL); |
| 1380 | if (!ret) { |
| 1381 | struct seq_file *m = filp->private_data; |
| 1382 | |
| 1383 | m->private = inode; |
| 1384 | } |
| 1385 | return ret; |
| 1386 | } |
| 1387 | |
| 1388 | static const struct file_operations proc_pid_sched_autogroup_operations = { |
| 1389 | .open = sched_autogroup_open, |
| 1390 | .read = seq_read, |
| 1391 | .write = sched_autogroup_write, |
| 1392 | .llseek = seq_lseek, |
| 1393 | .release = single_release, |
| 1394 | }; |
| 1395 | |
| 1396 | #endif /* CONFIG_SCHED_AUTOGROUP */ |
| 1397 | |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1398 | static ssize_t comm_write(struct file *file, const char __user *buf, |
| 1399 | size_t count, loff_t *offset) |
| 1400 | { |
| 1401 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1402 | struct task_struct *p; |
| 1403 | char buffer[TASK_COMM_LEN]; |
| 1404 | |
| 1405 | memset(buffer, 0, sizeof(buffer)); |
| 1406 | if (count > sizeof(buffer) - 1) |
| 1407 | count = sizeof(buffer) - 1; |
| 1408 | if (copy_from_user(buffer, buf, count)) |
| 1409 | return -EFAULT; |
| 1410 | |
| 1411 | p = get_proc_task(inode); |
| 1412 | if (!p) |
| 1413 | return -ESRCH; |
| 1414 | |
| 1415 | if (same_thread_group(current, p)) |
| 1416 | set_task_comm(p, buffer); |
| 1417 | else |
| 1418 | count = -EINVAL; |
| 1419 | |
| 1420 | put_task_struct(p); |
| 1421 | |
| 1422 | return count; |
| 1423 | } |
| 1424 | |
| 1425 | static int comm_show(struct seq_file *m, void *v) |
| 1426 | { |
| 1427 | struct inode *inode = m->private; |
| 1428 | struct task_struct *p; |
| 1429 | |
| 1430 | p = get_proc_task(inode); |
| 1431 | if (!p) |
| 1432 | return -ESRCH; |
| 1433 | |
| 1434 | task_lock(p); |
| 1435 | seq_printf(m, "%s\n", p->comm); |
| 1436 | task_unlock(p); |
| 1437 | |
| 1438 | put_task_struct(p); |
| 1439 | |
| 1440 | return 0; |
| 1441 | } |
| 1442 | |
| 1443 | static int comm_open(struct inode *inode, struct file *filp) |
| 1444 | { |
Jovi Zhang | c6a3405 | 2011-01-12 17:00:34 -0800 | [diff] [blame] | 1445 | return single_open(filp, comm_show, inode); |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1446 | } |
| 1447 | |
| 1448 | static const struct file_operations proc_pid_set_comm_operations = { |
| 1449 | .open = comm_open, |
| 1450 | .read = seq_read, |
| 1451 | .write = comm_write, |
| 1452 | .llseek = seq_lseek, |
| 1453 | .release = single_release, |
| 1454 | }; |
| 1455 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1456 | static int proc_exe_link(struct inode *inode, struct path *exe_path) |
| 1457 | { |
| 1458 | struct task_struct *task; |
| 1459 | struct mm_struct *mm; |
| 1460 | struct file *exe_file; |
| 1461 | |
| 1462 | task = get_proc_task(inode); |
| 1463 | if (!task) |
| 1464 | return -ENOENT; |
| 1465 | mm = get_task_mm(task); |
| 1466 | put_task_struct(task); |
| 1467 | if (!mm) |
| 1468 | return -ENOENT; |
| 1469 | exe_file = get_mm_exe_file(mm); |
| 1470 | mmput(mm); |
| 1471 | if (exe_file) { |
| 1472 | *exe_path = exe_file->f_path; |
| 1473 | path_get(&exe_file->f_path); |
| 1474 | fput(exe_file); |
| 1475 | return 0; |
| 1476 | } else |
| 1477 | return -ENOENT; |
| 1478 | } |
| 1479 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1480 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | { |
| 1482 | struct inode *inode = dentry->d_inode; |
| 1483 | int error = -EACCES; |
| 1484 | |
| 1485 | /* We don't need a base pointer in the /proc filesystem */ |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 1486 | path_put(&nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1488 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1489 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1492 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | out: |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1494 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | } |
| 1496 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1497 | 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] | 1498 | { |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1499 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1500 | char *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | int len; |
| 1502 | |
| 1503 | if (!tmp) |
| 1504 | return -ENOMEM; |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1505 | |
Eric W. Biederman | 7b2a69b | 2010-12-05 15:51:21 -0800 | [diff] [blame] | 1506 | pathname = d_path(path, tmp, PAGE_SIZE); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1507 | len = PTR_ERR(pathname); |
| 1508 | if (IS_ERR(pathname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | goto out; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1510 | len = tmp + PAGE_SIZE - 1 - pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | |
| 1512 | if (len > buflen) |
| 1513 | len = buflen; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1514 | if (copy_to_user(buffer, pathname, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | len = -EFAULT; |
| 1516 | out: |
| 1517 | free_page((unsigned long)tmp); |
| 1518 | return len; |
| 1519 | } |
| 1520 | |
| 1521 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) |
| 1522 | { |
| 1523 | int error = -EACCES; |
| 1524 | struct inode *inode = dentry->d_inode; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1525 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1527 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1528 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1531 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | if (error) |
| 1533 | goto out; |
| 1534 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1535 | error = do_proc_readlink(&path, buffer, buflen); |
| 1536 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | return error; |
| 1539 | } |
| 1540 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1541 | static const struct inode_operations proc_pid_link_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | .readlink = proc_pid_readlink, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1543 | .follow_link = proc_pid_follow_link, |
| 1544 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | }; |
| 1546 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1547 | |
| 1548 | /* building an inode */ |
| 1549 | |
| 1550 | static int task_dumpable(struct task_struct *task) |
| 1551 | { |
| 1552 | int dumpable = 0; |
| 1553 | struct mm_struct *mm; |
| 1554 | |
| 1555 | task_lock(task); |
| 1556 | mm = task->mm; |
| 1557 | if (mm) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 1558 | dumpable = get_dumpable(mm); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1559 | task_unlock(task); |
| 1560 | if(dumpable == 1) |
| 1561 | return 1; |
| 1562 | return 0; |
| 1563 | } |
| 1564 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1565 | 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] | 1566 | { |
| 1567 | struct inode * inode; |
| 1568 | struct proc_inode *ei; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1569 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1570 | |
| 1571 | /* We need a new inode */ |
| 1572 | |
| 1573 | inode = new_inode(sb); |
| 1574 | if (!inode) |
| 1575 | goto out; |
| 1576 | |
| 1577 | /* Common stuff */ |
| 1578 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 1579 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1580 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1581 | inode->i_op = &proc_def_inode_operations; |
| 1582 | |
| 1583 | /* |
| 1584 | * grab the reference to task. |
| 1585 | */ |
Oleg Nesterov | 1a657f78 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 1586 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1587 | if (!ei->pid) |
| 1588 | goto out_unlock; |
| 1589 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1590 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1591 | rcu_read_lock(); |
| 1592 | cred = __task_cred(task); |
| 1593 | inode->i_uid = cred->euid; |
| 1594 | inode->i_gid = cred->egid; |
| 1595 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1596 | } |
| 1597 | security_task_to_inode(task, inode); |
| 1598 | |
| 1599 | out: |
| 1600 | return inode; |
| 1601 | |
| 1602 | out_unlock: |
| 1603 | iput(inode); |
| 1604 | return NULL; |
| 1605 | } |
| 1606 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1607 | 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] | 1608 | { |
| 1609 | struct inode *inode = dentry->d_inode; |
| 1610 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1611 | const struct cred *cred; |
| 1612 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1613 | generic_fillattr(inode, stat); |
| 1614 | |
| 1615 | rcu_read_lock(); |
| 1616 | stat->uid = 0; |
| 1617 | stat->gid = 0; |
| 1618 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
| 1619 | if (task) { |
| 1620 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1621 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1622 | cred = __task_cred(task); |
| 1623 | stat->uid = cred->euid; |
| 1624 | stat->gid = cred->egid; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1625 | } |
| 1626 | } |
| 1627 | rcu_read_unlock(); |
| 1628 | return 0; |
| 1629 | } |
| 1630 | |
| 1631 | /* dentry stuff */ |
| 1632 | |
| 1633 | /* |
| 1634 | * Exceptional case: normally we are not allowed to unhash a busy |
| 1635 | * directory. In this case, however, we can do it - no aliasing problems |
| 1636 | * due to the way we treat inodes. |
| 1637 | * |
| 1638 | * Rewrite the inode's ownerships here because the owning task may have |
| 1639 | * performed a setuid(), etc. |
| 1640 | * |
| 1641 | * Before the /proc/pid/status file was created the only way to read |
| 1642 | * the effective uid of a /process was to stat /proc/pid. Reading |
| 1643 | * /proc/pid/status is slow enough that procps and other packages |
| 1644 | * kept stating /proc/pid. To keep the rules in /proc simple I have |
| 1645 | * made this apply to all per process world readable and executable |
| 1646 | * directories. |
| 1647 | */ |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1648 | int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1649 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1650 | struct inode *inode; |
| 1651 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1652 | const struct cred *cred; |
| 1653 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1654 | if (nd && nd->flags & LOOKUP_RCU) |
| 1655 | return -ECHILD; |
| 1656 | |
| 1657 | inode = dentry->d_inode; |
| 1658 | task = get_proc_task(inode); |
| 1659 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1660 | if (task) { |
| 1661 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1662 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1663 | rcu_read_lock(); |
| 1664 | cred = __task_cred(task); |
| 1665 | inode->i_uid = cred->euid; |
| 1666 | inode->i_gid = cred->egid; |
| 1667 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1668 | } else { |
| 1669 | inode->i_uid = 0; |
| 1670 | inode->i_gid = 0; |
| 1671 | } |
| 1672 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1673 | security_task_to_inode(task, inode); |
| 1674 | put_task_struct(task); |
| 1675 | return 1; |
| 1676 | } |
| 1677 | d_drop(dentry); |
| 1678 | return 0; |
| 1679 | } |
| 1680 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 1681 | static int pid_delete_dentry(const struct dentry * dentry) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1682 | { |
| 1683 | /* Is the task we represent dead? |
| 1684 | * If so, then don't put the dentry on the lru list, |
| 1685 | * kill it immediately. |
| 1686 | */ |
| 1687 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; |
| 1688 | } |
| 1689 | |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1690 | const struct dentry_operations pid_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1691 | { |
| 1692 | .d_revalidate = pid_revalidate, |
| 1693 | .d_delete = pid_delete_dentry, |
| 1694 | }; |
| 1695 | |
| 1696 | /* Lookups */ |
| 1697 | |
Eric W. Biederman | 1c0d04c | 2006-10-02 02:18:57 -0700 | [diff] [blame] | 1698 | /* |
| 1699 | * Fill a directory entry. |
| 1700 | * |
| 1701 | * If possible create the dcache entry and derive our inode number and |
| 1702 | * file type from dcache entry. |
| 1703 | * |
| 1704 | * Since all of the proc inode numbers are dynamically generated, the inode |
| 1705 | * numbers do not exist until the inode is cache. This means creating the |
| 1706 | * the dcache entry in readdir is necessary to keep the inode numbers |
| 1707 | * reported by readdir in sync with the inode numbers reported |
| 1708 | * by stat. |
| 1709 | */ |
Eric W. Biederman | 6b4e306 | 2010-03-07 16:41:34 -0800 | [diff] [blame] | 1710 | int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 1711 | const char *name, int len, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1712 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1713 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1714 | struct dentry *child, *dir = filp->f_path.dentry; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1715 | struct inode *inode; |
| 1716 | struct qstr qname; |
| 1717 | ino_t ino = 0; |
| 1718 | unsigned type = DT_UNKNOWN; |
| 1719 | |
| 1720 | qname.name = name; |
| 1721 | qname.len = len; |
| 1722 | qname.hash = full_name_hash(name, len); |
| 1723 | |
| 1724 | child = d_lookup(dir, &qname); |
| 1725 | if (!child) { |
| 1726 | struct dentry *new; |
| 1727 | new = d_alloc(dir, &qname); |
| 1728 | if (new) { |
| 1729 | child = instantiate(dir->d_inode, new, task, ptr); |
| 1730 | if (child) |
| 1731 | dput(new); |
| 1732 | else |
| 1733 | child = new; |
| 1734 | } |
| 1735 | } |
| 1736 | if (!child || IS_ERR(child) || !child->d_inode) |
| 1737 | goto end_instantiate; |
| 1738 | inode = child->d_inode; |
| 1739 | if (inode) { |
| 1740 | ino = inode->i_ino; |
| 1741 | type = inode->i_mode >> 12; |
| 1742 | } |
| 1743 | dput(child); |
| 1744 | end_instantiate: |
| 1745 | if (!ino) |
| 1746 | ino = find_inode_number(dir, &qname); |
| 1747 | if (!ino) |
| 1748 | ino = 1; |
| 1749 | return filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1750 | } |
| 1751 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1752 | static unsigned name_to_int(struct dentry *dentry) |
| 1753 | { |
| 1754 | const char *name = dentry->d_name.name; |
| 1755 | int len = dentry->d_name.len; |
| 1756 | unsigned n = 0; |
| 1757 | |
| 1758 | if (len > 1 && *name == '0') |
| 1759 | goto out; |
| 1760 | while (len-- > 0) { |
| 1761 | unsigned c = *name++ - '0'; |
| 1762 | if (c > 9) |
| 1763 | goto out; |
| 1764 | if (n >= (~0U-9)/10) |
| 1765 | goto out; |
| 1766 | n *= 10; |
| 1767 | n += c; |
| 1768 | } |
| 1769 | return n; |
| 1770 | out: |
| 1771 | return ~0U; |
| 1772 | } |
| 1773 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1774 | #define PROC_FDINFO_MAX 64 |
| 1775 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1776 | 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] | 1777 | { |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1778 | struct task_struct *task = get_proc_task(inode); |
| 1779 | struct files_struct *files = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1780 | struct file *file; |
| 1781 | int fd = proc_fd(inode); |
| 1782 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1783 | if (task) { |
| 1784 | files = get_files_struct(task); |
| 1785 | put_task_struct(task); |
| 1786 | } |
| 1787 | if (files) { |
| 1788 | /* |
| 1789 | * We are not taking a ref to the file structure, so we must |
| 1790 | * hold ->file_lock. |
| 1791 | */ |
| 1792 | spin_lock(&files->file_lock); |
| 1793 | file = fcheck_files(files, fd); |
| 1794 | if (file) { |
| 1795 | unsigned int f_flags; |
| 1796 | struct fdtable *fdt; |
Linus Torvalds | 1117f72 | 2011-08-06 11:51:33 -0700 | [diff] [blame] | 1797 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1798 | fdt = files_fdtable(files); |
| 1799 | f_flags = file->f_flags & ~O_CLOEXEC; |
| 1800 | if (FD_ISSET(fd, fdt->close_on_exec)) |
| 1801 | f_flags |= O_CLOEXEC; |
Linus Torvalds | 1117f72 | 2011-08-06 11:51:33 -0700 | [diff] [blame] | 1802 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1803 | if (path) { |
| 1804 | *path = file->f_path; |
| 1805 | path_get(&file->f_path); |
| 1806 | } |
| 1807 | if (info) |
| 1808 | snprintf(info, PROC_FDINFO_MAX, |
| 1809 | "pos:\t%lli\n" |
| 1810 | "flags:\t0%o\n", |
| 1811 | (long long) file->f_pos, |
| 1812 | f_flags); |
| 1813 | spin_unlock(&files->file_lock); |
| 1814 | put_files_struct(files); |
| 1815 | return 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1816 | } |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1817 | spin_unlock(&files->file_lock); |
| 1818 | put_files_struct(files); |
| 1819 | } |
| 1820 | return -ENOENT; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1821 | } |
| 1822 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1823 | static int proc_fd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1824 | { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1825 | return proc_fd_info(inode, path, NULL); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1826 | } |
| 1827 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1828 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1829 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1830 | struct inode *inode; |
| 1831 | struct task_struct *task; |
| 1832 | int fd; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1833 | struct files_struct *files; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1834 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1835 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1836 | if (nd && nd->flags & LOOKUP_RCU) |
| 1837 | return -ECHILD; |
| 1838 | |
| 1839 | inode = dentry->d_inode; |
| 1840 | task = get_proc_task(inode); |
| 1841 | fd = proc_fd(inode); |
| 1842 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1843 | if (task) { |
| 1844 | files = get_files_struct(task); |
| 1845 | if (files) { |
| 1846 | rcu_read_lock(); |
| 1847 | if (fcheck_files(files, fd)) { |
| 1848 | rcu_read_unlock(); |
| 1849 | put_files_struct(files); |
| 1850 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1851 | rcu_read_lock(); |
| 1852 | cred = __task_cred(task); |
| 1853 | inode->i_uid = cred->euid; |
| 1854 | inode->i_gid = cred->egid; |
| 1855 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1856 | } else { |
| 1857 | inode->i_uid = 0; |
| 1858 | inode->i_gid = 0; |
| 1859 | } |
| 1860 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1861 | security_task_to_inode(task, inode); |
| 1862 | put_task_struct(task); |
| 1863 | return 1; |
| 1864 | } |
| 1865 | rcu_read_unlock(); |
| 1866 | put_files_struct(files); |
| 1867 | } |
| 1868 | put_task_struct(task); |
| 1869 | } |
| 1870 | d_drop(dentry); |
| 1871 | return 0; |
| 1872 | } |
| 1873 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 1874 | static const struct dentry_operations tid_fd_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1875 | { |
| 1876 | .d_revalidate = tid_fd_revalidate, |
| 1877 | .d_delete = pid_delete_dentry, |
| 1878 | }; |
| 1879 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1880 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1881 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1882 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1883 | unsigned fd = *(const unsigned *)ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1884 | struct file *file; |
| 1885 | struct files_struct *files; |
| 1886 | struct inode *inode; |
| 1887 | struct proc_inode *ei; |
| 1888 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1889 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1890 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1891 | if (!inode) |
| 1892 | goto out; |
| 1893 | ei = PROC_I(inode); |
| 1894 | ei->fd = fd; |
| 1895 | files = get_files_struct(task); |
| 1896 | if (!files) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1897 | goto out_iput; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1898 | inode->i_mode = S_IFLNK; |
| 1899 | |
| 1900 | /* |
| 1901 | * We are not taking a ref to the file structure, so we must |
| 1902 | * hold ->file_lock. |
| 1903 | */ |
| 1904 | spin_lock(&files->file_lock); |
| 1905 | file = fcheck_files(files, fd); |
| 1906 | if (!file) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1907 | goto out_unlock; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1908 | if (file->f_mode & FMODE_READ) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1909 | inode->i_mode |= S_IRUSR | S_IXUSR; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1910 | if (file->f_mode & FMODE_WRITE) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1911 | inode->i_mode |= S_IWUSR | S_IXUSR; |
| 1912 | spin_unlock(&files->file_lock); |
| 1913 | put_files_struct(files); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1914 | |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1915 | inode->i_op = &proc_pid_link_inode_operations; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1916 | inode->i_size = 64; |
| 1917 | ei->op.proc_get_link = proc_fd_link; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 1918 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1919 | d_add(dentry, inode); |
| 1920 | /* Close the race of the process dying before we return the dentry */ |
| 1921 | if (tid_fd_revalidate(dentry, NULL)) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1922 | error = NULL; |
| 1923 | |
| 1924 | out: |
| 1925 | return error; |
| 1926 | out_unlock: |
| 1927 | spin_unlock(&files->file_lock); |
| 1928 | put_files_struct(files); |
| 1929 | out_iput: |
| 1930 | iput(inode); |
| 1931 | goto out; |
| 1932 | } |
| 1933 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1934 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
| 1935 | struct dentry *dentry, |
| 1936 | instantiate_t instantiate) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1937 | { |
| 1938 | struct task_struct *task = get_proc_task(dir); |
| 1939 | unsigned fd = name_to_int(dentry); |
| 1940 | struct dentry *result = ERR_PTR(-ENOENT); |
| 1941 | |
| 1942 | if (!task) |
| 1943 | goto out_no_task; |
| 1944 | if (fd == ~0U) |
| 1945 | goto out; |
| 1946 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1947 | result = instantiate(dir, dentry, task, &fd); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1948 | out: |
| 1949 | put_task_struct(task); |
| 1950 | out_no_task: |
| 1951 | return result; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1952 | } |
| 1953 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1954 | static int proc_readfd_common(struct file * filp, void * dirent, |
| 1955 | filldir_t filldir, instantiate_t instantiate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1957 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 1958 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1959 | struct task_struct *p = get_proc_task(inode); |
Pavel Emelyanov | 457c251 | 2007-10-18 23:40:43 -0700 | [diff] [blame] | 1960 | unsigned int fd, ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | struct files_struct * files; |
| 1963 | |
| 1964 | retval = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1965 | if (!p) |
| 1966 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | |
| 1969 | fd = filp->f_pos; |
| 1970 | switch (fd) { |
| 1971 | case 0: |
| 1972 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1973 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | filp->f_pos++; |
| 1975 | case 1: |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 1976 | ino = parent_ino(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1978 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | filp->f_pos++; |
| 1980 | default: |
| 1981 | files = get_files_struct(p); |
| 1982 | if (!files) |
Linus Torvalds | 5e442a4 | 2011-11-09 18:16:00 -0500 | [diff] [blame] | 1983 | goto out; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1984 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | for (fd = filp->f_pos-2; |
Al Viro | 9b4f526 | 2008-04-22 01:32:44 -0400 | [diff] [blame] | 1986 | fd < files_fdtable(files)->max_fds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | fd++, filp->f_pos++) { |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1988 | char name[PROC_NUMBUF]; |
| 1989 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | |
| 1991 | if (!fcheck_files(files, fd)) |
| 1992 | continue; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1993 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1995 | len = snprintf(name, sizeof(name), "%d", fd); |
| 1996 | if (proc_fill_cache(filp, dirent, filldir, |
| 1997 | name, len, instantiate, |
| 1998 | p, &fd) < 0) { |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1999 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | break; |
| 2001 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2002 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2004 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | put_files_struct(files); |
| 2006 | } |
| 2007 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2008 | put_task_struct(p); |
| 2009 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | return retval; |
| 2011 | } |
| 2012 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2013 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
| 2014 | struct nameidata *nd) |
| 2015 | { |
| 2016 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); |
| 2017 | } |
| 2018 | |
| 2019 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) |
| 2020 | { |
| 2021 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); |
| 2022 | } |
| 2023 | |
| 2024 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, |
| 2025 | size_t len, loff_t *ppos) |
| 2026 | { |
| 2027 | char tmp[PROC_FDINFO_MAX]; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 2028 | 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] | 2029 | if (!err) |
| 2030 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); |
| 2031 | return err; |
| 2032 | } |
| 2033 | |
| 2034 | static const struct file_operations proc_fdinfo_file_operations = { |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2035 | .open = nonseekable_open, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2036 | .read = proc_fdinfo_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2037 | .llseek = no_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2038 | }; |
| 2039 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2040 | static const struct file_operations proc_fd_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | .read = generic_read_dir, |
| 2042 | .readdir = proc_readfd, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2043 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | }; |
| 2045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | /* |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2047 | * /proc/pid/fd needs a special permission handler so that a process can still |
| 2048 | * access /proc/self/fd after it has executed a setuid(). |
| 2049 | */ |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 2050 | static int proc_fd_permission(struct inode *inode, int mask) |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2051 | { |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 2052 | int rv = generic_permission(inode, mask); |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2053 | if (rv == 0) |
| 2054 | return 0; |
| 2055 | if (task_pid(current) == proc_pid(inode)) |
| 2056 | rv = 0; |
| 2057 | return rv; |
| 2058 | } |
| 2059 | |
| 2060 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | * proc directories can do almost nothing.. |
| 2062 | */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2063 | static const struct inode_operations proc_fd_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | .lookup = proc_lookupfd, |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2065 | .permission = proc_fd_permission, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2066 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | }; |
| 2068 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2069 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
| 2070 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
| 2071 | { |
| 2072 | unsigned fd = *(unsigned *)ptr; |
| 2073 | struct inode *inode; |
| 2074 | struct proc_inode *ei; |
| 2075 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2076 | |
| 2077 | inode = proc_pid_make_inode(dir->i_sb, task); |
| 2078 | if (!inode) |
| 2079 | goto out; |
| 2080 | ei = PROC_I(inode); |
| 2081 | ei->fd = fd; |
| 2082 | inode->i_mode = S_IFREG | S_IRUSR; |
| 2083 | inode->i_fop = &proc_fdinfo_file_operations; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2084 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2085 | d_add(dentry, inode); |
| 2086 | /* Close the race of the process dying before we return the dentry */ |
| 2087 | if (tid_fd_revalidate(dentry, NULL)) |
| 2088 | error = NULL; |
| 2089 | |
| 2090 | out: |
| 2091 | return error; |
| 2092 | } |
| 2093 | |
| 2094 | static struct dentry *proc_lookupfdinfo(struct inode *dir, |
| 2095 | struct dentry *dentry, |
| 2096 | struct nameidata *nd) |
| 2097 | { |
| 2098 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); |
| 2099 | } |
| 2100 | |
| 2101 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) |
| 2102 | { |
| 2103 | return proc_readfd_common(filp, dirent, filldir, |
| 2104 | proc_fdinfo_instantiate); |
| 2105 | } |
| 2106 | |
| 2107 | static const struct file_operations proc_fdinfo_operations = { |
| 2108 | .read = generic_read_dir, |
| 2109 | .readdir = proc_readfdinfo, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2110 | .llseek = default_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2111 | }; |
| 2112 | |
| 2113 | /* |
| 2114 | * proc directories can do almost nothing.. |
| 2115 | */ |
| 2116 | static const struct inode_operations proc_fdinfo_inode_operations = { |
| 2117 | .lookup = proc_lookupfdinfo, |
| 2118 | .setattr = proc_setattr, |
| 2119 | }; |
| 2120 | |
| 2121 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2122 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2123 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2124 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2125 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2126 | struct inode *inode; |
| 2127 | struct proc_inode *ei; |
KOSAKI Motohiro | bd6daba | 2009-05-28 14:34:21 -0700 | [diff] [blame] | 2128 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2129 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2130 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2131 | if (!inode) |
| 2132 | goto out; |
| 2133 | |
| 2134 | ei = PROC_I(inode); |
| 2135 | inode->i_mode = p->mode; |
| 2136 | if (S_ISDIR(inode->i_mode)) |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2137 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2138 | if (p->iop) |
| 2139 | inode->i_op = p->iop; |
| 2140 | if (p->fop) |
| 2141 | inode->i_fop = p->fop; |
| 2142 | ei->op = p->op; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2143 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2144 | d_add(dentry, inode); |
| 2145 | /* Close the race of the process dying before we return the dentry */ |
| 2146 | if (pid_revalidate(dentry, NULL)) |
| 2147 | error = NULL; |
| 2148 | out: |
| 2149 | return error; |
| 2150 | } |
| 2151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | static struct dentry *proc_pident_lookup(struct inode *dir, |
| 2153 | struct dentry *dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2154 | const struct pid_entry *ents, |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2155 | unsigned int nents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2157 | struct dentry *error; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2158 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2159 | const struct pid_entry *p, *last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2161 | error = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2163 | if (!task) |
| 2164 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2166 | /* |
| 2167 | * Yes, it does not scale. And it should not. Don't add |
| 2168 | * new entries into /proc/<tgid>/ without very good reasons. |
| 2169 | */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2170 | last = &ents[nents - 1]; |
| 2171 | for (p = ents; p <= last; p++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | if (p->len != dentry->d_name.len) |
| 2173 | continue; |
| 2174 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2175 | break; |
| 2176 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2177 | if (p > last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | goto out; |
| 2179 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2180 | error = proc_pident_instantiate(dir, dentry, task, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2182 | put_task_struct(task); |
| 2183 | out_no_task: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2184 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | } |
| 2186 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2187 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
| 2188 | 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] | 2189 | { |
| 2190 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2191 | proc_pident_instantiate, task, p); |
| 2192 | } |
| 2193 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2194 | static int proc_pident_readdir(struct file *filp, |
| 2195 | void *dirent, filldir_t filldir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2196 | const struct pid_entry *ents, unsigned int nents) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2197 | { |
| 2198 | int i; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2199 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2200 | struct inode *inode = dentry->d_inode; |
| 2201 | struct task_struct *task = get_proc_task(inode); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2202 | const struct pid_entry *p, *last; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2203 | ino_t ino; |
| 2204 | int ret; |
| 2205 | |
| 2206 | ret = -ENOENT; |
| 2207 | if (!task) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2208 | goto out_no_task; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2209 | |
| 2210 | ret = 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2211 | i = filp->f_pos; |
| 2212 | switch (i) { |
| 2213 | case 0: |
| 2214 | ino = inode->i_ino; |
| 2215 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| 2216 | goto out; |
| 2217 | i++; |
| 2218 | filp->f_pos++; |
| 2219 | /* fall through */ |
| 2220 | case 1: |
| 2221 | ino = parent_ino(dentry); |
| 2222 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| 2223 | goto out; |
| 2224 | i++; |
| 2225 | filp->f_pos++; |
| 2226 | /* fall through */ |
| 2227 | default: |
| 2228 | i -= 2; |
| 2229 | if (i >= nents) { |
| 2230 | ret = 1; |
| 2231 | goto out; |
| 2232 | } |
| 2233 | p = ents + i; |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2234 | last = &ents[nents - 1]; |
| 2235 | while (p <= last) { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2236 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2237 | goto out; |
| 2238 | filp->f_pos++; |
| 2239 | p++; |
| 2240 | } |
| 2241 | } |
| 2242 | |
| 2243 | ret = 1; |
| 2244 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2245 | put_task_struct(task); |
| 2246 | out_no_task: |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2247 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | } |
| 2249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | #ifdef CONFIG_SECURITY |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2251 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, |
| 2252 | size_t count, loff_t *ppos) |
| 2253 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2254 | struct inode * inode = file->f_path.dentry->d_inode; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2255 | char *p = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2256 | ssize_t length; |
| 2257 | struct task_struct *task = get_proc_task(inode); |
| 2258 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2259 | if (!task) |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2260 | return -ESRCH; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2261 | |
| 2262 | length = security_getprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2263 | (char*)file->f_path.dentry->d_name.name, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2264 | &p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2265 | put_task_struct(task); |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2266 | if (length > 0) |
| 2267 | length = simple_read_from_buffer(buf, count, ppos, p, length); |
| 2268 | kfree(p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2269 | return length; |
| 2270 | } |
| 2271 | |
| 2272 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| 2273 | size_t count, loff_t *ppos) |
| 2274 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2275 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2276 | char *page; |
| 2277 | ssize_t length; |
| 2278 | struct task_struct *task = get_proc_task(inode); |
| 2279 | |
| 2280 | length = -ESRCH; |
| 2281 | if (!task) |
| 2282 | goto out_no_task; |
| 2283 | if (count > PAGE_SIZE) |
| 2284 | count = PAGE_SIZE; |
| 2285 | |
| 2286 | /* No partial writes. */ |
| 2287 | length = -EINVAL; |
| 2288 | if (*ppos != 0) |
| 2289 | goto out; |
| 2290 | |
| 2291 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 2292 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2293 | if (!page) |
| 2294 | goto out; |
| 2295 | |
| 2296 | length = -EFAULT; |
| 2297 | if (copy_from_user(page, buf, count)) |
| 2298 | goto out_free; |
| 2299 | |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2300 | /* Guard against adverse ptrace interaction */ |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2301 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2302 | if (length < 0) |
| 2303 | goto out_free; |
| 2304 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2305 | length = security_setprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2306 | (char*)file->f_path.dentry->d_name.name, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2307 | (void*)page, count); |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2308 | mutex_unlock(&task->signal->cred_guard_mutex); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2309 | out_free: |
| 2310 | free_page((unsigned long) page); |
| 2311 | out: |
| 2312 | put_task_struct(task); |
| 2313 | out_no_task: |
| 2314 | return length; |
| 2315 | } |
| 2316 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2317 | static const struct file_operations proc_pid_attr_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2318 | .read = proc_pid_attr_read, |
| 2319 | .write = proc_pid_attr_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2320 | .llseek = generic_file_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2321 | }; |
| 2322 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2323 | static const struct pid_entry attr_dir_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2324 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2325 | REG("prev", S_IRUGO, proc_pid_attr_operations), |
| 2326 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2327 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2328 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2329 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2330 | }; |
| 2331 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2332 | static int proc_attr_dir_readdir(struct file * filp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | void * dirent, filldir_t filldir) |
| 2334 | { |
| 2335 | return proc_pident_readdir(filp,dirent,filldir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2336 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | } |
| 2338 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2339 | static const struct file_operations proc_attr_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | .read = generic_read_dir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2341 | .readdir = proc_attr_dir_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2342 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | }; |
| 2344 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2345 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | struct dentry *dentry, struct nameidata *nd) |
| 2347 | { |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2348 | return proc_pident_lookup(dir, dentry, |
| 2349 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | } |
| 2351 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2352 | static const struct inode_operations proc_attr_dir_inode_operations = { |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2353 | .lookup = proc_attr_dir_lookup, |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2354 | .getattr = pid_getattr, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2355 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | }; |
| 2357 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | #endif |
| 2359 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2360 | #ifdef CONFIG_ELF_CORE |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2361 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
| 2362 | size_t count, loff_t *ppos) |
| 2363 | { |
| 2364 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 2365 | struct mm_struct *mm; |
| 2366 | char buffer[PROC_NUMBUF]; |
| 2367 | size_t len; |
| 2368 | int ret; |
| 2369 | |
| 2370 | if (!task) |
| 2371 | return -ESRCH; |
| 2372 | |
| 2373 | ret = 0; |
| 2374 | mm = get_task_mm(task); |
| 2375 | if (mm) { |
| 2376 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", |
| 2377 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> |
| 2378 | MMF_DUMP_FILTER_SHIFT)); |
| 2379 | mmput(mm); |
| 2380 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 2381 | } |
| 2382 | |
| 2383 | put_task_struct(task); |
| 2384 | |
| 2385 | return ret; |
| 2386 | } |
| 2387 | |
| 2388 | static ssize_t proc_coredump_filter_write(struct file *file, |
| 2389 | const char __user *buf, |
| 2390 | size_t count, |
| 2391 | loff_t *ppos) |
| 2392 | { |
| 2393 | struct task_struct *task; |
| 2394 | struct mm_struct *mm; |
| 2395 | char buffer[PROC_NUMBUF], *end; |
| 2396 | unsigned int val; |
| 2397 | int ret; |
| 2398 | int i; |
| 2399 | unsigned long mask; |
| 2400 | |
| 2401 | ret = -EFAULT; |
| 2402 | memset(buffer, 0, sizeof(buffer)); |
| 2403 | if (count > sizeof(buffer) - 1) |
| 2404 | count = sizeof(buffer) - 1; |
| 2405 | if (copy_from_user(buffer, buf, count)) |
| 2406 | goto out_no_task; |
| 2407 | |
| 2408 | ret = -EINVAL; |
| 2409 | val = (unsigned int)simple_strtoul(buffer, &end, 0); |
| 2410 | if (*end == '\n') |
| 2411 | end++; |
| 2412 | if (end - buffer == 0) |
| 2413 | goto out_no_task; |
| 2414 | |
| 2415 | ret = -ESRCH; |
| 2416 | task = get_proc_task(file->f_dentry->d_inode); |
| 2417 | if (!task) |
| 2418 | goto out_no_task; |
| 2419 | |
| 2420 | ret = end - buffer; |
| 2421 | mm = get_task_mm(task); |
| 2422 | if (!mm) |
| 2423 | goto out_no_mm; |
| 2424 | |
| 2425 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { |
| 2426 | if (val & mask) |
| 2427 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2428 | else |
| 2429 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2430 | } |
| 2431 | |
| 2432 | mmput(mm); |
| 2433 | out_no_mm: |
| 2434 | put_task_struct(task); |
| 2435 | out_no_task: |
| 2436 | return ret; |
| 2437 | } |
| 2438 | |
| 2439 | static const struct file_operations proc_coredump_filter_operations = { |
| 2440 | .read = proc_coredump_filter_read, |
| 2441 | .write = proc_coredump_filter_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2442 | .llseek = generic_file_llseek, |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2443 | }; |
| 2444 | #endif |
| 2445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | /* |
| 2447 | * /proc/self: |
| 2448 | */ |
| 2449 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| 2450 | int buflen) |
| 2451 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2452 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2453 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2454 | char tmp[PROC_NUMBUF]; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2455 | if (!tgid) |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2456 | return -ENOENT; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2457 | sprintf(tmp, "%d", tgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | return vfs_readlink(dentry,buffer,buflen,tmp); |
| 2459 | } |
| 2460 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 2461 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2462 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2463 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2464 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2465 | char *name = ERR_PTR(-ENOENT); |
| 2466 | if (tgid) { |
| 2467 | name = __getname(); |
| 2468 | if (!name) |
| 2469 | name = ERR_PTR(-ENOMEM); |
| 2470 | else |
| 2471 | sprintf(name, "%d", tgid); |
| 2472 | } |
| 2473 | nd_set_link(nd, name); |
| 2474 | return NULL; |
| 2475 | } |
| 2476 | |
| 2477 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, |
| 2478 | void *cookie) |
| 2479 | { |
| 2480 | char *s = nd_get_link(nd); |
| 2481 | if (!IS_ERR(s)) |
| 2482 | __putname(s); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2483 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2485 | static const struct inode_operations proc_self_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2486 | .readlink = proc_self_readlink, |
| 2487 | .follow_link = proc_self_follow_link, |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2488 | .put_link = proc_self_put_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2489 | }; |
| 2490 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2491 | /* |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2492 | * proc base |
| 2493 | * |
| 2494 | * These are the directory entries in the root directory of /proc |
| 2495 | * that properly belong to the /proc filesystem, as they describe |
| 2496 | * describe something that is process related. |
| 2497 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2498 | static const struct pid_entry proc_base_stuff[] = { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2499 | NOD("self", S_IFLNK|S_IRWXUGO, |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2500 | &proc_self_inode_operations, NULL, {}), |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2501 | }; |
| 2502 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2503 | static struct dentry *proc_base_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2504 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2505 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2506 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2507 | struct inode *inode; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2508 | struct proc_inode *ei; |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 2509 | struct dentry *error; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2510 | |
| 2511 | /* Allocate the inode */ |
| 2512 | error = ERR_PTR(-ENOMEM); |
| 2513 | inode = new_inode(dir->i_sb); |
| 2514 | if (!inode) |
| 2515 | goto out; |
| 2516 | |
| 2517 | /* Initialize the inode */ |
| 2518 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 2519 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2520 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2521 | |
| 2522 | /* |
| 2523 | * grab the reference to the task. |
| 2524 | */ |
Oleg Nesterov | 1a657f78 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 2525 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2526 | if (!ei->pid) |
| 2527 | goto out_iput; |
| 2528 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2529 | inode->i_mode = p->mode; |
| 2530 | if (S_ISDIR(inode->i_mode)) |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2531 | set_nlink(inode, 2); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2532 | if (S_ISLNK(inode->i_mode)) |
| 2533 | inode->i_size = 64; |
| 2534 | if (p->iop) |
| 2535 | inode->i_op = p->iop; |
| 2536 | if (p->fop) |
| 2537 | inode->i_fop = p->fop; |
| 2538 | ei->op = p->op; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2539 | d_add(dentry, inode); |
| 2540 | error = NULL; |
| 2541 | out: |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2542 | return error; |
| 2543 | out_iput: |
| 2544 | iput(inode); |
| 2545 | goto out; |
| 2546 | } |
| 2547 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2548 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
| 2549 | { |
| 2550 | struct dentry *error; |
| 2551 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2552 | const struct pid_entry *p, *last; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2553 | |
| 2554 | error = ERR_PTR(-ENOENT); |
| 2555 | |
| 2556 | if (!task) |
| 2557 | goto out_no_task; |
| 2558 | |
| 2559 | /* Lookup the directory entry */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2560 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
| 2561 | for (p = proc_base_stuff; p <= last; p++) { |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2562 | if (p->len != dentry->d_name.len) |
| 2563 | continue; |
| 2564 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2565 | break; |
| 2566 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2567 | if (p > last) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2568 | goto out; |
| 2569 | |
| 2570 | error = proc_base_instantiate(dir, dentry, task, p); |
| 2571 | |
| 2572 | out: |
| 2573 | put_task_struct(task); |
| 2574 | out_no_task: |
| 2575 | return error; |
| 2576 | } |
| 2577 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2578 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
| 2579 | 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] | 2580 | { |
| 2581 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2582 | proc_base_instantiate, task, p); |
| 2583 | } |
| 2584 | |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2585 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2586 | 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] | 2587 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2588 | struct task_io_accounting acct = task->ioac; |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2589 | unsigned long flags; |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2590 | int result; |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2591 | |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2592 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
| 2593 | if (result) |
| 2594 | return result; |
| 2595 | |
| 2596 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) { |
| 2597 | result = -EACCES; |
| 2598 | goto out_unlock; |
| 2599 | } |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 2600 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2601 | if (whole && lock_task_sighand(task, &flags)) { |
| 2602 | struct task_struct *t = task; |
Andrea Righi | b2d002d | 2008-07-26 15:22:27 -0700 | [diff] [blame] | 2603 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2604 | task_io_accounting_add(&acct, &task->signal->ioac); |
| 2605 | while_each_thread(task, t) |
| 2606 | task_io_accounting_add(&acct, &t->ioac); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2607 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2608 | unlock_task_sighand(task, &flags); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2609 | } |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2610 | result = sprintf(buffer, |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2611 | "rchar: %llu\n" |
| 2612 | "wchar: %llu\n" |
| 2613 | "syscr: %llu\n" |
| 2614 | "syscw: %llu\n" |
| 2615 | "read_bytes: %llu\n" |
| 2616 | "write_bytes: %llu\n" |
| 2617 | "cancelled_write_bytes: %llu\n", |
Alexander Beregalov | 7c44319 | 2008-08-05 13:01:34 -0700 | [diff] [blame] | 2618 | (unsigned long long)acct.rchar, |
| 2619 | (unsigned long long)acct.wchar, |
| 2620 | (unsigned long long)acct.syscr, |
| 2621 | (unsigned long long)acct.syscw, |
| 2622 | (unsigned long long)acct.read_bytes, |
| 2623 | (unsigned long long)acct.write_bytes, |
| 2624 | (unsigned long long)acct.cancelled_write_bytes); |
Vasiliy Kulikov | 293eb1e | 2011-07-26 16:08:38 -0700 | [diff] [blame] | 2625 | out_unlock: |
| 2626 | mutex_unlock(&task->signal->cred_guard_mutex); |
| 2627 | return result; |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2628 | } |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2629 | |
| 2630 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) |
| 2631 | { |
| 2632 | return do_io_accounting(task, buffer, 0); |
| 2633 | } |
| 2634 | |
| 2635 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) |
| 2636 | { |
| 2637 | return do_io_accounting(task, buffer, 1); |
| 2638 | } |
| 2639 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2640 | |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2641 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
| 2642 | struct pid *pid, struct task_struct *task) |
| 2643 | { |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2644 | int err = lock_trace(task); |
| 2645 | if (!err) { |
| 2646 | seq_printf(m, "%08x\n", task->personality); |
| 2647 | unlock_trace(task); |
| 2648 | } |
| 2649 | return err; |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2650 | } |
| 2651 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2652 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2653 | * Thread groups |
| 2654 | */ |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2655 | static const struct file_operations proc_task_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2656 | static const struct inode_operations proc_task_inode_operations; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2657 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2658 | static const struct pid_entry tgid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2659 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
| 2660 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2661 | 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] | 2662 | 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] | 2663 | #ifdef CONFIG_NET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2664 | 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] | 2665 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2666 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2667 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2668 | ONE("status", S_IRUGO, proc_pid_status), |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2669 | ONE("personality", S_IRUGO, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 2670 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2671 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2672 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2673 | #endif |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 2674 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 2675 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), |
| 2676 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 2677 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2678 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2679 | INF("syscall", S_IRUGO, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2680 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2681 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2682 | ONE("stat", S_IRUGO, proc_tgid_stat), |
| 2683 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2684 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2685 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2686 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2687 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2688 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2689 | LNK("cwd", proc_cwd_link), |
| 2690 | LNK("root", proc_root_link), |
| 2691 | LNK("exe", proc_exe_link), |
| 2692 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2693 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
| 2694 | REG("mountstats", S_IRUSR, proc_mountstats_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2695 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2696 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2697 | REG("smaps", S_IRUGO, proc_smaps_operations), |
Al Viro | ca6b0bf | 2011-02-15 22:04:37 -0500 | [diff] [blame] | 2698 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2699 | #endif |
| 2700 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2701 | 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] | 2702 | #endif |
| 2703 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2704 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2705 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2706 | #ifdef CONFIG_STACKTRACE |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 2707 | ONE("stack", S_IRUGO, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2708 | #endif |
| 2709 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2710 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2711 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2712 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2713 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2714 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2715 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2716 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2717 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2718 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2719 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2720 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2721 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2722 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 2723 | 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] | 2724 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2725 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2726 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2727 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2728 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2729 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2730 | #endif |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2731 | #ifdef CONFIG_ELF_CORE |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2732 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2733 | #endif |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2734 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 2735 | INF("io", S_IRUSR, proc_tgid_io_accounting), |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2736 | #endif |
Chris Metcalf | f133ecc | 2011-05-26 12:40:09 -0400 | [diff] [blame] | 2737 | #ifdef CONFIG_HARDWALL |
| 2738 | INF("hardwall", S_IRUGO, proc_pid_hardwall), |
| 2739 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2740 | }; |
| 2741 | |
| 2742 | static int proc_tgid_base_readdir(struct file * filp, |
| 2743 | void * dirent, filldir_t filldir) |
| 2744 | { |
| 2745 | return proc_pident_readdir(filp,dirent,filldir, |
| 2746 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
| 2747 | } |
| 2748 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2749 | static const struct file_operations proc_tgid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2750 | .read = generic_read_dir, |
| 2751 | .readdir = proc_tgid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2752 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2753 | }; |
| 2754 | |
| 2755 | 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] | 2756 | return proc_pident_lookup(dir, dentry, |
| 2757 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2758 | } |
| 2759 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2760 | static const struct inode_operations proc_tgid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2761 | .lookup = proc_tgid_base_lookup, |
| 2762 | .getattr = pid_getattr, |
| 2763 | .setattr = proc_setattr, |
| 2764 | }; |
| 2765 | |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2766 | 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] | 2767 | { |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2768 | struct dentry *dentry, *leader, *dir; |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2769 | char buf[PROC_NUMBUF]; |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2770 | struct qstr name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2771 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2772 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2773 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| 2774 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2775 | if (dentry) { |
Sukadev Bhattiprolu | 29f12ca | 2009-11-11 14:26:32 -0800 | [diff] [blame] | 2776 | shrink_dcache_parent(dentry); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2777 | d_drop(dentry); |
| 2778 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2779 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2780 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2781 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2782 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
| 2783 | leader = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2784 | if (!leader) |
| 2785 | goto out; |
| 2786 | |
| 2787 | name.name = "task"; |
| 2788 | name.len = strlen(name.name); |
| 2789 | dir = d_hash_and_lookup(leader, &name); |
| 2790 | if (!dir) |
| 2791 | goto out_put_leader; |
| 2792 | |
| 2793 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2794 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2795 | dentry = d_hash_and_lookup(dir, &name); |
| 2796 | if (dentry) { |
| 2797 | shrink_dcache_parent(dentry); |
| 2798 | d_drop(dentry); |
| 2799 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2800 | } |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2801 | |
| 2802 | dput(dir); |
| 2803 | out_put_leader: |
| 2804 | dput(leader); |
| 2805 | out: |
| 2806 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | } |
| 2808 | |
Randy Dunlap | 0895e91 | 2007-10-21 21:00:10 -0700 | [diff] [blame] | 2809 | /** |
| 2810 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| 2811 | * @task: task that should be flushed. |
| 2812 | * |
| 2813 | * When flushing dentries from proc, one needs to flush them from global |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2814 | * 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] | 2815 | * in. This call is supposed to do all of this job. |
| 2816 | * |
| 2817 | * Looks in the dcache for |
| 2818 | * /proc/@pid |
| 2819 | * /proc/@tgid/task/@pid |
| 2820 | * if either directory is present flushes it and all of it'ts children |
| 2821 | * from the dcache. |
| 2822 | * |
| 2823 | * It is safe and reasonable to cache /proc entries for a task until |
| 2824 | * that task exits. After that they just clog up the dcache with |
| 2825 | * useless entries, possibly causing useful dcache entries to be |
| 2826 | * flushed instead. This routine is proved to flush those useless |
| 2827 | * dcache entries at process exit time. |
| 2828 | * |
| 2829 | * NOTE: This routine is just an optimization so it does not guarantee |
| 2830 | * that no dcache entries will exist at process exit time it |
| 2831 | * just makes it very unlikely that any will persist. |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2832 | */ |
| 2833 | |
| 2834 | void proc_flush_task(struct task_struct *task) |
| 2835 | { |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2836 | int i; |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2837 | struct pid *pid, *tgid; |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2838 | struct upid *upid; |
| 2839 | |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2840 | pid = task_pid(task); |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2841 | tgid = task_tgid(task); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2842 | |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2843 | for (i = 0; i <= pid->level; i++) { |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2844 | upid = &pid->numbers[i]; |
| 2845 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2846 | tgid->numbers[i].nr); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2847 | } |
Pavel Emelyanov | 6f4e643 | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2848 | |
| 2849 | upid = &pid->numbers[pid->level]; |
| 2850 | if (upid->nr == 1) |
| 2851 | pid_ns_release_proc(upid->ns); |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2852 | } |
| 2853 | |
Adrian Bunk | 9711ef9 | 2006-12-06 20:38:31 -0800 | [diff] [blame] | 2854 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
| 2855 | struct dentry * dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2856 | struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2857 | { |
| 2858 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2859 | struct inode *inode; |
| 2860 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2861 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2862 | if (!inode) |
| 2863 | goto out; |
| 2864 | |
| 2865 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 2866 | inode->i_op = &proc_tgid_base_inode_operations; |
| 2867 | inode->i_fop = &proc_tgid_base_operations; |
| 2868 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 2869 | |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2870 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
| 2871 | ARRAY_SIZE(tgid_base_stuff))); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2872 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2873 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2874 | |
| 2875 | d_add(dentry, inode); |
| 2876 | /* Close the race of the process dying before we return the dentry */ |
| 2877 | if (pid_revalidate(dentry, NULL)) |
| 2878 | error = NULL; |
| 2879 | out: |
| 2880 | return error; |
| 2881 | } |
| 2882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2883 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 2884 | { |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 2885 | struct dentry *result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | unsigned tgid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2888 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2890 | result = proc_base_lookup(dir, dentry); |
| 2891 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) |
| 2892 | goto out; |
| 2893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | tgid = name_to_int(dentry); |
| 2895 | if (tgid == ~0U) |
| 2896 | goto out; |
| 2897 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2898 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2899 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2900 | task = find_task_by_pid_ns(tgid, ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | if (task) |
| 2902 | get_task_struct(task); |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2903 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | if (!task) |
| 2905 | goto out; |
| 2906 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2907 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2908 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2909 | out: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2910 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2911 | } |
| 2912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2913 | /* |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2914 | * Find the first task with tgid >= tgid |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2915 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2917 | struct tgid_iter { |
| 2918 | unsigned int tgid; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2919 | struct task_struct *task; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2920 | }; |
| 2921 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) |
| 2922 | { |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2923 | struct pid *pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2924 | |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2925 | if (iter.task) |
| 2926 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2927 | rcu_read_lock(); |
| 2928 | retry: |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2929 | iter.task = NULL; |
| 2930 | pid = find_ge_pid(iter.tgid, ns); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2931 | if (pid) { |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2932 | iter.tgid = pid_nr_ns(pid, ns); |
| 2933 | iter.task = pid_task(pid, PIDTYPE_PID); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2934 | /* What we to know is if the pid we have find is the |
| 2935 | * pid of a thread_group_leader. Testing for task |
| 2936 | * being a thread_group_leader is the obvious thing |
| 2937 | * todo but there is a window when it fails, due to |
| 2938 | * the pid transfer logic in de_thread. |
| 2939 | * |
| 2940 | * So we perform the straight forward test of seeing |
| 2941 | * if the pid we have found is the pid of a thread |
| 2942 | * group leader, and don't worry if the task we have |
| 2943 | * found doesn't happen to be a thread group leader. |
| 2944 | * As we don't care in the case of readdir. |
| 2945 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2946 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
| 2947 | iter.tgid += 1; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2948 | goto retry; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2949 | } |
| 2950 | get_task_struct(iter.task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2951 | } |
Eric W. Biederman | 454cc10 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2952 | rcu_read_unlock(); |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2953 | return iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2954 | } |
| 2955 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2956 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2958 | 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] | 2959 | struct tgid_iter iter) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2960 | { |
| 2961 | char name[PROC_NUMBUF]; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2962 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2963 | return proc_fill_cache(filp, dirent, filldir, name, len, |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2964 | proc_pid_instantiate, iter.task, NULL); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2965 | } |
| 2966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2967 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
| 2968 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 2969 | { |
Linus Torvalds | d8bdc59 | 2011-04-18 10:36:54 -0700 | [diff] [blame] | 2970 | unsigned int nr; |
| 2971 | struct task_struct *reaper; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2972 | struct tgid_iter iter; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2973 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2974 | |
Linus Torvalds | d8bdc59 | 2011-04-18 10:36:54 -0700 | [diff] [blame] | 2975 | if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET) |
| 2976 | goto out_no_task; |
| 2977 | nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
| 2978 | |
| 2979 | reaper = get_proc_task(filp->f_path.dentry->d_inode); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2980 | if (!reaper) |
| 2981 | goto out_no_task; |
| 2982 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2983 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2984 | const struct pid_entry *p = &proc_base_stuff[nr]; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2985 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2986 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2987 | } |
| 2988 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2989 | ns = filp->f_dentry->d_sb->s_fs_info; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2990 | iter.task = NULL; |
| 2991 | iter.tgid = filp->f_pos - TGID_OFFSET; |
| 2992 | for (iter = next_tgid(ns, iter); |
| 2993 | iter.task; |
| 2994 | iter.tgid += 1, iter = next_tgid(ns, iter)) { |
| 2995 | filp->f_pos = iter.tgid + TGID_OFFSET; |
| 2996 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { |
| 2997 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2998 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2999 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3000 | } |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3001 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
| 3002 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3003 | put_task_struct(reaper); |
| 3004 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3005 | return 0; |
| 3006 | } |
| 3007 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3008 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3009 | * Tasks |
| 3010 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3011 | static const struct pid_entry tid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3012 | 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] | 3013 | 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] | 3014 | 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] | 3015 | REG("environ", S_IRUSR, proc_environ_operations), |
| 3016 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 3017 | ONE("status", S_IRUGO, proc_pid_status), |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3018 | ONE("personality", S_IRUGO, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 3019 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3020 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3021 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3022 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 3023 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3024 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3025 | INF("syscall", S_IRUGO, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3026 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3027 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 3028 | ONE("stat", S_IRUGO, proc_tid_stat), |
| 3029 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 3030 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3031 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3032 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3033 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3034 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 3035 | LNK("cwd", proc_cwd_link), |
| 3036 | LNK("root", proc_root_link), |
| 3037 | LNK("exe", proc_exe_link), |
| 3038 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 3039 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 3040 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3041 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 3042 | REG("smaps", S_IRUGO, proc_smaps_operations), |
Al Viro | ca6b0bf | 2011-02-15 22:04:37 -0500 | [diff] [blame] | 3043 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3044 | #endif |
| 3045 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3046 | 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] | 3047 | #endif |
| 3048 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3049 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3050 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 3051 | #ifdef CONFIG_STACKTRACE |
Al Viro | a9712bc | 2011-03-23 15:52:50 -0400 | [diff] [blame] | 3052 | ONE("stack", S_IRUGO, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3053 | #endif |
| 3054 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3055 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3056 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3057 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3058 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3059 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 3060 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3061 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3062 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3063 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3064 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3065 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3066 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 3067 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 3068 | 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] | 3069 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3070 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
Al Viro | 26ec3c6 | 2011-02-15 21:24:05 -0500 | [diff] [blame] | 3071 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3072 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3073 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3074 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3075 | #endif |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3076 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Vasiliy Kulikov | 1d1221f | 2011-06-24 16:08:38 +0400 | [diff] [blame] | 3077 | INF("io", S_IRUSR, proc_tid_io_accounting), |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3078 | #endif |
Chris Metcalf | f133ecc | 2011-05-26 12:40:09 -0400 | [diff] [blame] | 3079 | #ifdef CONFIG_HARDWALL |
| 3080 | INF("hardwall", S_IRUGO, proc_pid_hardwall), |
| 3081 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3082 | }; |
| 3083 | |
| 3084 | static int proc_tid_base_readdir(struct file * filp, |
| 3085 | void * dirent, filldir_t filldir) |
| 3086 | { |
| 3087 | return proc_pident_readdir(filp,dirent,filldir, |
| 3088 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); |
| 3089 | } |
| 3090 | |
| 3091 | 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] | 3092 | return proc_pident_lookup(dir, dentry, |
| 3093 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3094 | } |
| 3095 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3096 | static const struct file_operations proc_tid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3097 | .read = generic_read_dir, |
| 3098 | .readdir = proc_tid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3099 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3100 | }; |
| 3101 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3102 | static const struct inode_operations proc_tid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3103 | .lookup = proc_tid_base_lookup, |
| 3104 | .getattr = pid_getattr, |
| 3105 | .setattr = proc_setattr, |
| 3106 | }; |
| 3107 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3108 | static struct dentry *proc_task_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3109 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3110 | { |
| 3111 | struct dentry *error = ERR_PTR(-ENOENT); |
| 3112 | struct inode *inode; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3113 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3114 | |
| 3115 | if (!inode) |
| 3116 | goto out; |
| 3117 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 3118 | inode->i_op = &proc_tid_base_inode_operations; |
| 3119 | inode->i_fop = &proc_tid_base_operations; |
| 3120 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 3121 | |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 3122 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
| 3123 | ARRAY_SIZE(tid_base_stuff))); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3124 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 3125 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3126 | |
| 3127 | d_add(dentry, inode); |
| 3128 | /* Close the race of the process dying before we return the dentry */ |
| 3129 | if (pid_revalidate(dentry, NULL)) |
| 3130 | error = NULL; |
| 3131 | out: |
| 3132 | return error; |
| 3133 | } |
| 3134 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3135 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 3136 | { |
| 3137 | struct dentry *result = ERR_PTR(-ENOENT); |
| 3138 | struct task_struct *task; |
| 3139 | struct task_struct *leader = get_proc_task(dir); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3140 | unsigned tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3141 | struct pid_namespace *ns; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3142 | |
| 3143 | if (!leader) |
| 3144 | goto out_no_task; |
| 3145 | |
| 3146 | tid = name_to_int(dentry); |
| 3147 | if (tid == ~0U) |
| 3148 | goto out; |
| 3149 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3150 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3151 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3152 | task = find_task_by_pid_ns(tid, ns); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3153 | if (task) |
| 3154 | get_task_struct(task); |
| 3155 | rcu_read_unlock(); |
| 3156 | if (!task) |
| 3157 | goto out; |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 3158 | if (!same_thread_group(leader, task)) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3159 | goto out_drop_task; |
| 3160 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3161 | result = proc_task_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3162 | out_drop_task: |
| 3163 | put_task_struct(task); |
| 3164 | out: |
| 3165 | put_task_struct(leader); |
| 3166 | out_no_task: |
| 3167 | return result; |
| 3168 | } |
| 3169 | |
| 3170 | /* |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3171 | * Find the first tid of a thread group to return to user space. |
| 3172 | * |
| 3173 | * Usually this is just the thread group leader, but if the users |
| 3174 | * buffer was too small or there was a seek into the middle of the |
| 3175 | * directory we have more work todo. |
| 3176 | * |
| 3177 | * In the case of a short read we start with find_task_by_pid. |
| 3178 | * |
| 3179 | * In the case of a seek we start with the leader and walk nr |
| 3180 | * threads past it. |
| 3181 | */ |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3182 | static struct task_struct *first_tid(struct task_struct *leader, |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3183 | int tid, int nr, struct pid_namespace *ns) |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3184 | { |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3185 | struct task_struct *pos; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3186 | |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3187 | rcu_read_lock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3188 | /* Attempt to start with the pid of a thread */ |
| 3189 | if (tid && (nr > 0)) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3190 | pos = find_task_by_pid_ns(tid, ns); |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3191 | if (pos && (pos->group_leader == leader)) |
| 3192 | goto found; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3193 | } |
| 3194 | |
| 3195 | /* If nr exceeds the number of threads there is nothing todo */ |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3196 | pos = NULL; |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3197 | if (nr && nr >= get_nr_threads(leader)) |
| 3198 | goto out; |
| 3199 | |
| 3200 | /* If we haven't found our starting place yet start |
| 3201 | * with the leader and walk nr threads forward. |
| 3202 | */ |
| 3203 | for (pos = leader; nr > 0; --nr) { |
| 3204 | pos = next_thread(pos); |
| 3205 | if (pos == leader) { |
| 3206 | pos = NULL; |
| 3207 | goto out; |
| 3208 | } |
| 3209 | } |
| 3210 | found: |
| 3211 | get_task_struct(pos); |
| 3212 | out: |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3213 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3214 | return pos; |
| 3215 | } |
| 3216 | |
| 3217 | /* |
| 3218 | * Find the next thread in the thread list. |
| 3219 | * Return NULL if there is an error or no next thread. |
| 3220 | * |
| 3221 | * The reference to the input task_struct is released. |
| 3222 | */ |
| 3223 | static struct task_struct *next_tid(struct task_struct *start) |
| 3224 | { |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3225 | struct task_struct *pos = NULL; |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3226 | rcu_read_lock(); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3227 | if (pid_alive(start)) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3228 | pos = next_thread(start); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3229 | if (thread_group_leader(pos)) |
| 3230 | pos = NULL; |
| 3231 | else |
| 3232 | get_task_struct(pos); |
| 3233 | } |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3234 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3235 | put_task_struct(start); |
| 3236 | return pos; |
| 3237 | } |
| 3238 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3239 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 3240 | struct task_struct *task, int tid) |
| 3241 | { |
| 3242 | char name[PROC_NUMBUF]; |
| 3243 | int len = snprintf(name, sizeof(name), "%d", tid); |
| 3244 | return proc_fill_cache(filp, dirent, filldir, name, len, |
| 3245 | proc_task_instantiate, task, NULL); |
| 3246 | } |
| 3247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3248 | /* for the /proc/TGID/task/ directories */ |
| 3249 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3250 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 3251 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3252 | struct inode *inode = dentry->d_inode; |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3253 | struct task_struct *leader = NULL; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3254 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3255 | int retval = -ENOENT; |
| 3256 | ino_t ino; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3257 | int tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3258 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3259 | |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3260 | task = get_proc_task(inode); |
| 3261 | if (!task) |
| 3262 | goto out_no_task; |
| 3263 | rcu_read_lock(); |
| 3264 | if (pid_alive(task)) { |
| 3265 | leader = task->group_leader; |
| 3266 | get_task_struct(leader); |
| 3267 | } |
| 3268 | rcu_read_unlock(); |
| 3269 | put_task_struct(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3270 | if (!leader) |
| 3271 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3272 | retval = 0; |
| 3273 | |
Linus Torvalds | ee568b2 | 2009-03-17 10:02:35 -0700 | [diff] [blame] | 3274 | switch ((unsigned long)filp->f_pos) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3275 | case 0: |
| 3276 | ino = inode->i_ino; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3277 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3278 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3279 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3280 | /* fall through */ |
| 3281 | case 1: |
| 3282 | ino = parent_ino(dentry); |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3283 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3284 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3285 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3286 | /* fall through */ |
| 3287 | } |
| 3288 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3289 | /* f_version caches the tgid value that the last readdir call couldn't |
| 3290 | * return. lseek aka telldir automagically resets f_version to 0. |
| 3291 | */ |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3292 | ns = filp->f_dentry->d_sb->s_fs_info; |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3293 | tid = (int)filp->f_version; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3294 | filp->f_version = 0; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3295 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3296 | task; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3297 | task = next_tid(task), filp->f_pos++) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3298 | tid = task_pid_nr_ns(task, ns); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3299 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3300 | /* returning this tgid failed, save it as the first |
| 3301 | * pid for the next readir call */ |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3302 | filp->f_version = (u64)tid; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3303 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3304 | break; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3305 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3306 | } |
| 3307 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3308 | put_task_struct(leader); |
| 3309 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3310 | return retval; |
| 3311 | } |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3312 | |
| 3313 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 3314 | { |
| 3315 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3316 | struct task_struct *p = get_proc_task(inode); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3317 | generic_fillattr(inode, stat); |
| 3318 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3319 | if (p) { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3320 | stat->nlink += get_nr_threads(p); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3321 | put_task_struct(p); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3322 | } |
| 3323 | |
| 3324 | return 0; |
| 3325 | } |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3326 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3327 | static const struct inode_operations proc_task_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3328 | .lookup = proc_task_lookup, |
| 3329 | .getattr = proc_task_getattr, |
| 3330 | .setattr = proc_setattr, |
| 3331 | }; |
| 3332 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3333 | static const struct file_operations proc_task_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3334 | .read = generic_read_dir, |
| 3335 | .readdir = proc_task_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3336 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3337 | }; |