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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #include "internal.h" |
| 87 | |
Eric W. Biederman | 0f2fe20 | 2006-06-26 00:25:46 -0700 | [diff] [blame] | 88 | /* NOTE: |
| 89 | * Implementing inode permission operations in /proc is almost |
| 90 | * certainly an error. Permission checks need to happen during |
| 91 | * each system call not at open time. The reason is that most of |
| 92 | * what we wish to check for permissions in /proc varies at runtime. |
| 93 | * |
| 94 | * The classic example of a problem is opening file descriptors |
| 95 | * in /proc for a task before it execs a suid executable. |
| 96 | */ |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | struct pid_entry { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | char *name; |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 100 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | mode_t mode; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 102 | const struct inode_operations *iop; |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 103 | const struct file_operations *fop; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 104 | union proc_op op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | }; |
| 106 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 107 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 108 | .name = (NAME), \ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 109 | .len = sizeof(NAME) - 1, \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 110 | .mode = MODE, \ |
| 111 | .iop = IOP, \ |
| 112 | .fop = FOP, \ |
| 113 | .op = OP, \ |
| 114 | } |
| 115 | |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 116 | #define DIR(NAME, MODE, iops, fops) \ |
| 117 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) |
| 118 | #define LNK(NAME, get_link) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 119 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 120 | &proc_pid_link_inode_operations, NULL, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 121 | { .proc_get_link = get_link } ) |
| 122 | #define REG(NAME, MODE, fops) \ |
| 123 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) |
| 124 | #define INF(NAME, MODE, read) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 125 | NOD(NAME, (S_IFREG|(MODE)), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 126 | NULL, &proc_info_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 127 | { .proc_read = read } ) |
| 128 | #define ONE(NAME, MODE, show) \ |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 129 | NOD(NAME, (S_IFREG|(MODE)), \ |
| 130 | NULL, &proc_single_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 131 | { .proc_show = show } ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 133 | /* |
| 134 | * Count the number of hardlinks for the pid_entry table, excluding the . |
| 135 | * and .. links. |
| 136 | */ |
| 137 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, |
| 138 | unsigned int n) |
| 139 | { |
| 140 | unsigned int i; |
| 141 | unsigned int count; |
| 142 | |
| 143 | count = 0; |
| 144 | for (i = 0; i < n; ++i) { |
| 145 | if (S_ISDIR(entries[i].mode)) |
| 146 | ++count; |
| 147 | } |
| 148 | |
| 149 | return count; |
| 150 | } |
| 151 | |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 152 | static int get_task_root(struct task_struct *task, struct path *root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 154 | int result = -ENOENT; |
| 155 | |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 156 | task_lock(task); |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 157 | if (task->fs) { |
| 158 | get_fs_root(task->fs, root); |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 159 | result = 0; |
| 160 | } |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 161 | task_unlock(task); |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 162 | return result; |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 163 | } |
| 164 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 165 | static int proc_cwd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 166 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 167 | struct task_struct *task = get_proc_task(inode); |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 168 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 169 | |
| 170 | if (task) { |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 171 | task_lock(task); |
| 172 | if (task->fs) { |
| 173 | get_fs_pwd(task->fs, path); |
| 174 | result = 0; |
| 175 | } |
| 176 | task_unlock(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 177 | put_task_struct(task); |
| 178 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return result; |
| 180 | } |
| 181 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 182 | static int proc_root_link(struct inode *inode, struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 184 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 186 | |
| 187 | if (task) { |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 188 | result = get_task_root(task, path); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 189 | put_task_struct(task); |
| 190 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | return result; |
| 192 | } |
| 193 | |
Roland McGrath | 638fa202 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 194 | /* |
| 195 | * Return zero if current may access user memory in @task, -error if not. |
| 196 | */ |
| 197 | static int check_mem_permission(struct task_struct *task) |
| 198 | { |
| 199 | /* |
| 200 | * A task can always look at itself, in case it chooses |
| 201 | * to use system calls instead of load instructions. |
| 202 | */ |
| 203 | if (task == current) |
| 204 | return 0; |
| 205 | |
| 206 | /* |
| 207 | * If current is actively ptrace'ing, and would also be |
| 208 | * permitted to freshly attach with ptrace now, permit it. |
| 209 | */ |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 210 | if (task_is_stopped_or_traced(task)) { |
| 211 | int match; |
| 212 | rcu_read_lock(); |
| 213 | match = (tracehook_tracer_task(task) == current); |
| 214 | rcu_read_unlock(); |
| 215 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) |
| 216 | return 0; |
| 217 | } |
Roland McGrath | 638fa202 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 218 | |
| 219 | /* |
| 220 | * Noone else is allowed. |
| 221 | */ |
| 222 | return -EPERM; |
| 223 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 225 | struct mm_struct *mm_for_maps(struct task_struct *task) |
| 226 | { |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 227 | struct mm_struct *mm; |
Oleg Nesterov | 00f89d2 | 2009-07-10 03:27:38 +0200 | [diff] [blame] | 228 | |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 229 | if (mutex_lock_killable(&task->signal->cred_guard_mutex)) |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 230 | return NULL; |
| 231 | |
| 232 | mm = get_task_mm(task); |
| 233 | if (mm && mm != current->mm && |
| 234 | !ptrace_may_access(task, PTRACE_MODE_READ)) { |
| 235 | mmput(mm); |
| 236 | mm = NULL; |
Oleg Nesterov | 13f0fea | 2009-06-23 21:25:32 +0200 | [diff] [blame] | 237 | } |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 238 | mutex_unlock(&task->signal->cred_guard_mutex); |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 239 | |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 240 | return mm; |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 241 | } |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
| 244 | { |
| 245 | int res = 0; |
| 246 | unsigned int len; |
| 247 | struct mm_struct *mm = get_task_mm(task); |
| 248 | if (!mm) |
| 249 | goto out; |
| 250 | if (!mm->arg_end) |
| 251 | goto out_mm; /* Shh! No looking before we're done */ |
| 252 | |
| 253 | len = mm->arg_end - mm->arg_start; |
| 254 | |
| 255 | if (len > PAGE_SIZE) |
| 256 | len = PAGE_SIZE; |
| 257 | |
| 258 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); |
| 259 | |
| 260 | // If the nul at the end of args has been overwritten, then |
| 261 | // assume application is using setproctitle(3). |
| 262 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { |
| 263 | len = strnlen(buffer, res); |
| 264 | if (len < res) { |
| 265 | res = len; |
| 266 | } else { |
| 267 | len = mm->env_end - mm->env_start; |
| 268 | if (len > PAGE_SIZE - res) |
| 269 | len = PAGE_SIZE - res; |
| 270 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); |
| 271 | res = strnlen(buffer, res); |
| 272 | } |
| 273 | } |
| 274 | out_mm: |
| 275 | mmput(mm); |
| 276 | out: |
| 277 | return res; |
| 278 | } |
| 279 | |
| 280 | static int proc_pid_auxv(struct task_struct *task, char *buffer) |
| 281 | { |
| 282 | int res = 0; |
| 283 | struct mm_struct *mm = get_task_mm(task); |
| 284 | if (mm) { |
| 285 | unsigned int nwords = 0; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 286 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | nwords += 2; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 288 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | res = nwords * sizeof(mm->saved_auxv[0]); |
| 290 | if (res > PAGE_SIZE) |
| 291 | res = PAGE_SIZE; |
| 292 | memcpy(buffer, mm->saved_auxv, res); |
| 293 | mmput(mm); |
| 294 | } |
| 295 | return res; |
| 296 | } |
| 297 | |
| 298 | |
| 299 | #ifdef CONFIG_KALLSYMS |
| 300 | /* |
| 301 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. |
| 302 | * Returns the resolved symbol. If that fails, simply return the address. |
| 303 | */ |
| 304 | static int proc_pid_wchan(struct task_struct *task, char *buffer) |
| 305 | { |
Alexey Dobriyan | ffb4512 | 2007-05-08 00:28:41 -0700 | [diff] [blame] | 306 | unsigned long wchan; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 307 | char symname[KSYM_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
| 309 | wchan = get_wchan(task); |
| 310 | |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 311 | if (lookup_symbol_name(wchan, symname) < 0) |
Jake Edge | f83ce3e | 2009-05-04 12:51:14 -0600 | [diff] [blame] | 312 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
| 313 | return 0; |
| 314 | else |
| 315 | return sprintf(buffer, "%lu", wchan); |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 316 | else |
| 317 | return sprintf(buffer, "%s", symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | #endif /* CONFIG_KALLSYMS */ |
| 320 | |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 321 | #ifdef CONFIG_STACKTRACE |
| 322 | |
| 323 | #define MAX_STACK_TRACE_DEPTH 64 |
| 324 | |
| 325 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, |
| 326 | struct pid *pid, struct task_struct *task) |
| 327 | { |
| 328 | struct stack_trace trace; |
| 329 | unsigned long *entries; |
| 330 | int i; |
| 331 | |
| 332 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); |
| 333 | if (!entries) |
| 334 | return -ENOMEM; |
| 335 | |
| 336 | trace.nr_entries = 0; |
| 337 | trace.max_entries = MAX_STACK_TRACE_DEPTH; |
| 338 | trace.entries = entries; |
| 339 | trace.skip = 0; |
| 340 | save_stack_trace_tsk(task, &trace); |
| 341 | |
| 342 | for (i = 0; i < trace.nr_entries; i++) { |
| 343 | seq_printf(m, "[<%p>] %pS\n", |
| 344 | (void *)entries[i], (void *)entries[i]); |
| 345 | } |
| 346 | kfree(entries); |
| 347 | |
| 348 | return 0; |
| 349 | } |
| 350 | #endif |
| 351 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | #ifdef CONFIG_SCHEDSTATS |
| 353 | /* |
| 354 | * Provides /proc/PID/schedstat |
| 355 | */ |
| 356 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) |
| 357 | { |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 358 | return sprintf(buffer, "%llu %llu %lu\n", |
Ingo Molnar | 826e08b | 2008-12-22 07:37:41 +0100 | [diff] [blame] | 359 | (unsigned long long)task->se.sum_exec_runtime, |
| 360 | (unsigned long long)task->sched_info.run_delay, |
Ingo Molnar | 2d72376 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 361 | task->sched_info.pcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | #endif |
| 364 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 365 | #ifdef CONFIG_LATENCYTOP |
| 366 | static int lstats_show_proc(struct seq_file *m, void *v) |
| 367 | { |
| 368 | int i; |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 369 | struct inode *inode = m->private; |
| 370 | struct task_struct *task = get_proc_task(inode); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 371 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 372 | if (!task) |
| 373 | return -ESRCH; |
| 374 | seq_puts(m, "Latency Top version : v0.1\n"); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 375 | for (i = 0; i < 32; i++) { |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 376 | struct latency_record *lr = &task->latency_record[i]; |
| 377 | if (lr->backtrace[0]) { |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 378 | int q; |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 379 | seq_printf(m, "%i %li %li", |
| 380 | lr->count, lr->time, lr->max); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 381 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 382 | unsigned long bt = lr->backtrace[q]; |
| 383 | if (!bt) |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 384 | break; |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 385 | if (bt == ULONG_MAX) |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 386 | break; |
Joe Perches | 34e49d4 | 2011-01-12 17:00:30 -0800 | [diff] [blame] | 387 | seq_printf(m, " %ps", (void *)bt); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 388 | } |
| 389 | seq_printf(m, "\n"); |
| 390 | } |
| 391 | |
| 392 | } |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 393 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | static int lstats_open(struct inode *inode, struct file *file) |
| 398 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 399 | return single_open(file, lstats_show_proc, inode); |
Hiroshi Shimamoto | d6643d1 | 2008-02-14 10:27:00 -0800 | [diff] [blame] | 400 | } |
| 401 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 402 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
| 403 | size_t count, loff_t *offs) |
| 404 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 405 | 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] | 406 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 407 | if (!task) |
| 408 | return -ESRCH; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 409 | clear_all_latency_tracing(task); |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 410 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 411 | |
| 412 | return count; |
| 413 | } |
| 414 | |
| 415 | static const struct file_operations proc_lstats_operations = { |
| 416 | .open = lstats_open, |
| 417 | .read = seq_read, |
| 418 | .write = lstats_write, |
| 419 | .llseek = seq_lseek, |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 420 | .release = single_release, |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 421 | }; |
| 422 | |
| 423 | #endif |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | static int proc_oom_score(struct task_struct *task, char *buffer) |
| 426 | { |
Oleg Nesterov | b95c35e | 2010-04-01 15:13:57 +0200 | [diff] [blame] | 427 | unsigned long points = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 429 | read_lock(&tasklist_lock); |
Oleg Nesterov | b95c35e | 2010-04-01 15:13:57 +0200 | [diff] [blame] | 430 | if (pid_alive(task)) |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 431 | points = oom_badness(task, NULL, NULL, |
| 432 | totalram_pages + total_swap_pages); |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 433 | read_unlock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | return sprintf(buffer, "%lu\n", points); |
| 435 | } |
| 436 | |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 437 | struct limit_names { |
| 438 | char *name; |
| 439 | char *unit; |
| 440 | }; |
| 441 | |
| 442 | static const struct limit_names lnames[RLIM_NLIMITS] = { |
Kees Cook | cff4edb | 2009-09-22 16:45:32 -0700 | [diff] [blame] | 443 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 444 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
| 445 | [RLIMIT_DATA] = {"Max data size", "bytes"}, |
| 446 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, |
| 447 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, |
| 448 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, |
| 449 | [RLIMIT_NPROC] = {"Max processes", "processes"}, |
| 450 | [RLIMIT_NOFILE] = {"Max open files", "files"}, |
| 451 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, |
| 452 | [RLIMIT_AS] = {"Max address space", "bytes"}, |
| 453 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, |
| 454 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, |
| 455 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, |
| 456 | [RLIMIT_NICE] = {"Max nice priority", NULL}, |
| 457 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, |
Eugene Teo | 8808117 | 2008-02-23 15:23:52 -0800 | [diff] [blame] | 458 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 459 | }; |
| 460 | |
| 461 | /* Display limits for a process */ |
| 462 | static int proc_pid_limits(struct task_struct *task, char *buffer) |
| 463 | { |
| 464 | unsigned int i; |
| 465 | int count = 0; |
| 466 | unsigned long flags; |
| 467 | char *bufptr = buffer; |
| 468 | |
| 469 | struct rlimit rlim[RLIM_NLIMITS]; |
| 470 | |
Lai Jiangshan | a6bebbc | 2008-10-05 00:51:15 +0400 | [diff] [blame] | 471 | if (!lock_task_sighand(task, &flags)) |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 472 | return 0; |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 473 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
| 474 | unlock_task_sighand(task, &flags); |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 475 | |
| 476 | /* |
| 477 | * print the file header |
| 478 | */ |
| 479 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", |
| 480 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
| 481 | |
| 482 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 483 | if (rlim[i].rlim_cur == RLIM_INFINITY) |
| 484 | count += sprintf(&bufptr[count], "%-25s %-20s ", |
| 485 | lnames[i].name, "unlimited"); |
| 486 | else |
| 487 | count += sprintf(&bufptr[count], "%-25s %-20lu ", |
| 488 | lnames[i].name, rlim[i].rlim_cur); |
| 489 | |
| 490 | if (rlim[i].rlim_max == RLIM_INFINITY) |
| 491 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); |
| 492 | else |
| 493 | count += sprintf(&bufptr[count], "%-20lu ", |
| 494 | rlim[i].rlim_max); |
| 495 | |
| 496 | if (lnames[i].unit) |
| 497 | count += sprintf(&bufptr[count], "%-10s\n", |
| 498 | lnames[i].unit); |
| 499 | else |
| 500 | count += sprintf(&bufptr[count], "\n"); |
| 501 | } |
| 502 | |
| 503 | return count; |
| 504 | } |
| 505 | |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 506 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
| 507 | static int proc_pid_syscall(struct task_struct *task, char *buffer) |
| 508 | { |
| 509 | long nr; |
| 510 | unsigned long args[6], sp, pc; |
| 511 | |
| 512 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) |
| 513 | return sprintf(buffer, "running\n"); |
| 514 | |
| 515 | if (nr < 0) |
| 516 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
| 517 | |
| 518 | return sprintf(buffer, |
| 519 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
| 520 | nr, |
| 521 | args[0], args[1], args[2], args[3], args[4], args[5], |
| 522 | sp, pc); |
| 523 | } |
| 524 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ |
| 525 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | /************************************************************************/ |
| 527 | /* Here the fs part begins */ |
| 528 | /************************************************************************/ |
| 529 | |
| 530 | /* permission checks */ |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 531 | static int proc_fd_access_allowed(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | { |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 533 | struct task_struct *task; |
| 534 | int allowed = 0; |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 535 | /* Allow access to a task's file descriptors if it is us or we |
| 536 | * may use ptrace attach to the process and find out that |
| 537 | * information. |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 538 | */ |
| 539 | task = get_proc_task(inode); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 540 | if (task) { |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 541 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 542 | put_task_struct(task); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 543 | } |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 544 | return allowed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | } |
| 546 | |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 547 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
| 548 | { |
| 549 | int error; |
| 550 | struct inode *inode = dentry->d_inode; |
| 551 | |
| 552 | if (attr->ia_valid & ATTR_MODE) |
| 553 | return -EPERM; |
| 554 | |
| 555 | error = inode_change_ok(inode, attr); |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 556 | if (error) |
| 557 | return error; |
| 558 | |
| 559 | if ((attr->ia_valid & ATTR_SIZE) && |
| 560 | attr->ia_size != i_size_read(inode)) { |
| 561 | error = vmtruncate(inode, attr->ia_size); |
| 562 | if (error) |
| 563 | return error; |
| 564 | } |
| 565 | |
| 566 | setattr_copy(inode, attr); |
| 567 | mark_inode_dirty(inode); |
| 568 | return 0; |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 569 | } |
| 570 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 571 | static const struct inode_operations proc_def_inode_operations = { |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 572 | .setattr = proc_setattr, |
| 573 | }; |
| 574 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 575 | static int mounts_open_common(struct inode *inode, struct file *file, |
| 576 | const struct seq_operations *op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 578 | struct task_struct *task = get_proc_task(inode); |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 579 | struct nsproxy *nsp; |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 580 | struct mnt_namespace *ns = NULL; |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 581 | struct path root; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 582 | struct proc_mounts *p; |
| 583 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 585 | if (task) { |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 586 | rcu_read_lock(); |
| 587 | nsp = task_nsproxy(task); |
| 588 | if (nsp) { |
| 589 | ns = nsp->mnt_ns; |
Alexey Dobriyan | 863c470 | 2007-01-26 00:56:53 -0800 | [diff] [blame] | 590 | if (ns) |
| 591 | get_mnt_ns(ns); |
| 592 | } |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 593 | rcu_read_unlock(); |
Miklos Szeredi | f7ad3c6 | 2010-08-10 11:41:36 +0200 | [diff] [blame] | 594 | if (ns && get_task_root(task, &root) == 0) |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 595 | ret = 0; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 596 | put_task_struct(task); |
| 597 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 599 | if (!ns) |
| 600 | goto err; |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 601 | if (ret) |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 602 | goto err_put_ns; |
| 603 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 604 | ret = -ENOMEM; |
| 605 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); |
| 606 | if (!p) |
| 607 | goto err_put_path; |
| 608 | |
| 609 | file->private_data = &p->m; |
| 610 | ret = seq_open(file, op); |
| 611 | if (ret) |
| 612 | goto err_free; |
| 613 | |
| 614 | p->m.private = p; |
| 615 | p->ns = ns; |
| 616 | p->root = root; |
| 617 | p->event = ns->event; |
| 618 | |
| 619 | return 0; |
| 620 | |
| 621 | err_free: |
| 622 | kfree(p); |
| 623 | err_put_path: |
| 624 | path_put(&root); |
| 625 | err_put_ns: |
| 626 | put_mnt_ns(ns); |
| 627 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return ret; |
| 629 | } |
| 630 | |
| 631 | static int mounts_release(struct inode *inode, struct file *file) |
| 632 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 633 | struct proc_mounts *p = file->private_data; |
| 634 | path_put(&p->root); |
| 635 | put_mnt_ns(p->ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | return seq_release(inode, file); |
| 637 | } |
| 638 | |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 639 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
| 640 | { |
| 641 | struct proc_mounts *p = file->private_data; |
KOSAKI Motohiro | 31b0709 | 2009-04-09 13:57:59 +0900 | [diff] [blame] | 642 | unsigned res = POLLIN | POLLRDNORM; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 643 | |
Al Viro | 9f5596a | 2010-02-05 00:40:25 -0500 | [diff] [blame] | 644 | poll_wait(file, &p->ns->poll, wait); |
| 645 | if (mnt_had_events(p)) |
KOSAKI Motohiro | 31b0709 | 2009-04-09 13:57:59 +0900 | [diff] [blame] | 646 | res |= POLLERR | POLLPRI; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 647 | |
| 648 | return res; |
| 649 | } |
| 650 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 651 | static int mounts_open(struct inode *inode, struct file *file) |
| 652 | { |
| 653 | return mounts_open_common(inode, file, &mounts_op); |
| 654 | } |
| 655 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 656 | static const struct file_operations proc_mounts_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | .open = mounts_open, |
| 658 | .read = seq_read, |
| 659 | .llseek = seq_lseek, |
| 660 | .release = mounts_release, |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 661 | .poll = mounts_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | }; |
| 663 | |
Ram Pai | 2d4d486 | 2008-03-27 13:06:25 +0100 | [diff] [blame] | 664 | static int mountinfo_open(struct inode *inode, struct file *file) |
| 665 | { |
| 666 | return mounts_open_common(inode, file, &mountinfo_op); |
| 667 | } |
| 668 | |
| 669 | static const struct file_operations proc_mountinfo_operations = { |
| 670 | .open = mountinfo_open, |
| 671 | .read = seq_read, |
| 672 | .llseek = seq_lseek, |
| 673 | .release = mounts_release, |
| 674 | .poll = mounts_poll, |
| 675 | }; |
| 676 | |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 677 | static int mountstats_open(struct inode *inode, struct file *file) |
| 678 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 679 | return mounts_open_common(inode, file, &mountstats_op); |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 680 | } |
| 681 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 682 | static const struct file_operations proc_mountstats_operations = { |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 683 | .open = mountstats_open, |
| 684 | .read = seq_read, |
| 685 | .llseek = seq_lseek, |
| 686 | .release = mounts_release, |
| 687 | }; |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
| 690 | |
| 691 | static ssize_t proc_info_read(struct file * file, char __user * buf, |
| 692 | size_t count, loff_t *ppos) |
| 693 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 694 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | unsigned long page; |
| 696 | ssize_t length; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 697 | struct task_struct *task = get_proc_task(inode); |
| 698 | |
| 699 | length = -ESRCH; |
| 700 | if (!task) |
| 701 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | if (count > PROC_BLOCK_SIZE) |
| 704 | count = PROC_BLOCK_SIZE; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 705 | |
| 706 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 707 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 708 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
| 710 | length = PROC_I(inode)->op.proc_read(task, (char*)page); |
| 711 | |
| 712 | if (length >= 0) |
| 713 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); |
| 714 | free_page(page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 715 | out: |
| 716 | put_task_struct(task); |
| 717 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | return length; |
| 719 | } |
| 720 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 721 | static const struct file_operations proc_info_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | .read = proc_info_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 723 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | }; |
| 725 | |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 726 | static int proc_single_show(struct seq_file *m, void *v) |
| 727 | { |
| 728 | struct inode *inode = m->private; |
| 729 | struct pid_namespace *ns; |
| 730 | struct pid *pid; |
| 731 | struct task_struct *task; |
| 732 | int ret; |
| 733 | |
| 734 | ns = inode->i_sb->s_fs_info; |
| 735 | pid = proc_pid(inode); |
| 736 | task = get_pid_task(pid, PIDTYPE_PID); |
| 737 | if (!task) |
| 738 | return -ESRCH; |
| 739 | |
| 740 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); |
| 741 | |
| 742 | put_task_struct(task); |
| 743 | return ret; |
| 744 | } |
| 745 | |
| 746 | static int proc_single_open(struct inode *inode, struct file *filp) |
| 747 | { |
| 748 | int ret; |
| 749 | ret = single_open(filp, proc_single_show, NULL); |
| 750 | if (!ret) { |
| 751 | struct seq_file *m = filp->private_data; |
| 752 | |
| 753 | m->private = inode; |
| 754 | } |
| 755 | return ret; |
| 756 | } |
| 757 | |
| 758 | static const struct file_operations proc_single_file_operations = { |
| 759 | .open = proc_single_open, |
| 760 | .read = seq_read, |
| 761 | .llseek = seq_lseek, |
| 762 | .release = single_release, |
| 763 | }; |
| 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | static int mem_open(struct inode* inode, struct file* file) |
| 766 | { |
| 767 | file->private_data = (void*)((long)current->self_exec_id); |
KAMEZAWA Hiroyuki | 4a3956c | 2010-10-01 14:20:22 -0700 | [diff] [blame] | 768 | /* OK to pass negative loff_t, we can catch out-of-range */ |
| 769 | file->f_mode |= FMODE_UNSIGNED_OFFSET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | return 0; |
| 771 | } |
| 772 | |
| 773 | static ssize_t mem_read(struct file * file, char __user * buf, |
| 774 | size_t count, loff_t *ppos) |
| 775 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 776 | 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] | 777 | char *page; |
| 778 | unsigned long src = *ppos; |
| 779 | int ret = -ESRCH; |
| 780 | struct mm_struct *mm; |
| 781 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 782 | if (!task) |
| 783 | goto out_no_task; |
| 784 | |
Roland McGrath | 638fa202 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 785 | if (check_mem_permission(task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | goto out; |
| 787 | |
| 788 | ret = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 789 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | if (!page) |
| 791 | goto out; |
| 792 | |
| 793 | ret = 0; |
| 794 | |
| 795 | mm = get_task_mm(task); |
| 796 | if (!mm) |
| 797 | goto out_free; |
| 798 | |
| 799 | ret = -EIO; |
| 800 | |
| 801 | if (file->private_data != (void*)((long)current->self_exec_id)) |
| 802 | goto out_put; |
| 803 | |
| 804 | ret = 0; |
| 805 | |
| 806 | while (count > 0) { |
| 807 | int this_len, retval; |
| 808 | |
| 809 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 810 | retval = access_process_vm(task, src, page, this_len, 0); |
Roland McGrath | 638fa202 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 811 | if (!retval || check_mem_permission(task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | if (!ret) |
| 813 | ret = -EIO; |
| 814 | break; |
| 815 | } |
| 816 | |
| 817 | if (copy_to_user(buf, page, retval)) { |
| 818 | ret = -EFAULT; |
| 819 | break; |
| 820 | } |
| 821 | |
| 822 | ret += retval; |
| 823 | src += retval; |
| 824 | buf += retval; |
| 825 | count -= retval; |
| 826 | } |
| 827 | *ppos = src; |
| 828 | |
| 829 | out_put: |
| 830 | mmput(mm); |
| 831 | out_free: |
| 832 | free_page((unsigned long) page); |
| 833 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 834 | put_task_struct(task); |
| 835 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | return ret; |
| 837 | } |
| 838 | |
| 839 | #define mem_write NULL |
| 840 | |
| 841 | #ifndef mem_write |
| 842 | /* This is a security hazard */ |
Glauber de Oliveira Costa | 63967fa | 2007-02-20 13:58:12 -0800 | [diff] [blame] | 843 | static ssize_t mem_write(struct file * file, const char __user *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | size_t count, loff_t *ppos) |
| 845 | { |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 846 | int copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | char *page; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 848 | 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] | 849 | unsigned long dst = *ppos; |
| 850 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 851 | copied = -ESRCH; |
| 852 | if (!task) |
| 853 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
Roland McGrath | 638fa202 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 855 | if (check_mem_permission(task)) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 856 | goto out; |
| 857 | |
| 858 | copied = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 859 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | if (!page) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 861 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 863 | copied = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | while (count > 0) { |
| 865 | int this_len, retval; |
| 866 | |
| 867 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 868 | if (copy_from_user(page, buf, this_len)) { |
| 869 | copied = -EFAULT; |
| 870 | break; |
| 871 | } |
| 872 | retval = access_process_vm(task, dst, page, this_len, 1); |
| 873 | if (!retval) { |
| 874 | if (!copied) |
| 875 | copied = -EIO; |
| 876 | break; |
| 877 | } |
| 878 | copied += retval; |
| 879 | buf += retval; |
| 880 | dst += retval; |
| 881 | count -= retval; |
| 882 | } |
| 883 | *ppos = dst; |
| 884 | free_page((unsigned long) page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 885 | out: |
| 886 | put_task_struct(task); |
| 887 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | return copied; |
| 889 | } |
| 890 | #endif |
| 891 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 892 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | { |
| 894 | switch (orig) { |
| 895 | case 0: |
| 896 | file->f_pos = offset; |
| 897 | break; |
| 898 | case 1: |
| 899 | file->f_pos += offset; |
| 900 | break; |
| 901 | default: |
| 902 | return -EINVAL; |
| 903 | } |
| 904 | force_successful_syscall_return(); |
| 905 | return file->f_pos; |
| 906 | } |
| 907 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 908 | static const struct file_operations proc_mem_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | .llseek = mem_lseek, |
| 910 | .read = mem_read, |
| 911 | .write = mem_write, |
| 912 | .open = mem_open, |
| 913 | }; |
| 914 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 915 | static ssize_t environ_read(struct file *file, char __user *buf, |
| 916 | size_t count, loff_t *ppos) |
| 917 | { |
| 918 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 919 | char *page; |
| 920 | unsigned long src = *ppos; |
| 921 | int ret = -ESRCH; |
| 922 | struct mm_struct *mm; |
| 923 | |
| 924 | if (!task) |
| 925 | goto out_no_task; |
| 926 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 927 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 928 | goto out; |
| 929 | |
| 930 | ret = -ENOMEM; |
| 931 | page = (char *)__get_free_page(GFP_TEMPORARY); |
| 932 | if (!page) |
| 933 | goto out; |
| 934 | |
| 935 | ret = 0; |
| 936 | |
| 937 | mm = get_task_mm(task); |
| 938 | if (!mm) |
| 939 | goto out_free; |
| 940 | |
| 941 | while (count > 0) { |
| 942 | int this_len, retval, max_len; |
| 943 | |
| 944 | this_len = mm->env_end - (mm->env_start + src); |
| 945 | |
| 946 | if (this_len <= 0) |
| 947 | break; |
| 948 | |
| 949 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 950 | this_len = (this_len > max_len) ? max_len : this_len; |
| 951 | |
| 952 | retval = access_process_vm(task, (mm->env_start + src), |
| 953 | page, this_len, 0); |
| 954 | |
| 955 | if (retval <= 0) { |
| 956 | ret = retval; |
| 957 | break; |
| 958 | } |
| 959 | |
| 960 | if (copy_to_user(buf, page, retval)) { |
| 961 | ret = -EFAULT; |
| 962 | break; |
| 963 | } |
| 964 | |
| 965 | ret += retval; |
| 966 | src += retval; |
| 967 | buf += retval; |
| 968 | count -= retval; |
| 969 | } |
| 970 | *ppos = src; |
| 971 | |
| 972 | mmput(mm); |
| 973 | out_free: |
| 974 | free_page((unsigned long) page); |
| 975 | out: |
| 976 | put_task_struct(task); |
| 977 | out_no_task: |
| 978 | return ret; |
| 979 | } |
| 980 | |
| 981 | static const struct file_operations proc_environ_operations = { |
| 982 | .read = environ_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 983 | .llseek = generic_file_llseek, |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 984 | }; |
| 985 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
| 987 | size_t count, loff_t *ppos) |
| 988 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 989 | 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] | 990 | char buffer[PROC_NUMBUF]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | size_t len; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 992 | int oom_adjust = OOM_DISABLE; |
| 993 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 995 | if (!task) |
| 996 | return -ESRCH; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 997 | |
| 998 | if (lock_task_sighand(task, &flags)) { |
| 999 | oom_adjust = task->signal->oom_adj; |
| 1000 | unlock_task_sighand(task, &flags); |
| 1001 | } |
| 1002 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1003 | put_task_struct(task); |
| 1004 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1005 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1006 | |
| 1007 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | } |
| 1009 | |
| 1010 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, |
| 1011 | size_t count, loff_t *ppos) |
| 1012 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1013 | struct task_struct *task; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1014 | char buffer[PROC_NUMBUF]; |
| 1015 | long oom_adjust; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1016 | unsigned long flags; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1017 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1019 | memset(buffer, 0, sizeof(buffer)); |
| 1020 | if (count > sizeof(buffer) - 1) |
| 1021 | count = sizeof(buffer) - 1; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1022 | if (copy_from_user(buffer, buf, count)) { |
| 1023 | err = -EFAULT; |
| 1024 | goto out; |
| 1025 | } |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1026 | |
| 1027 | err = strict_strtol(strstrip(buffer), 0, &oom_adjust); |
| 1028 | if (err) |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1029 | goto out; |
Alexey Dobriyan | 8ac773b | 2006-10-19 23:28:32 -0700 | [diff] [blame] | 1030 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1031 | oom_adjust != OOM_DISABLE) { |
| 1032 | err = -EINVAL; |
| 1033 | goto out; |
| 1034 | } |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1035 | |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1036 | task = get_proc_task(file->f_path.dentry->d_inode); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1037 | if (!task) { |
| 1038 | err = -ESRCH; |
| 1039 | goto out; |
| 1040 | } |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1041 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1042 | task_lock(task); |
| 1043 | if (!task->mm) { |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1044 | err = -EINVAL; |
| 1045 | goto err_task_lock; |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1046 | } |
| 1047 | |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1048 | if (!lock_task_sighand(task, &flags)) { |
| 1049 | err = -ESRCH; |
| 1050 | goto err_task_lock; |
| 1051 | } |
| 1052 | |
| 1053 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { |
| 1054 | err = -EACCES; |
| 1055 | goto err_sighand; |
| 1056 | } |
| 1057 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1058 | if (oom_adjust != task->signal->oom_adj) { |
| 1059 | if (oom_adjust == OOM_DISABLE) |
| 1060 | atomic_inc(&task->mm->oom_disable_count); |
| 1061 | if (task->signal->oom_adj == OOM_DISABLE) |
| 1062 | atomic_dec(&task->mm->oom_disable_count); |
| 1063 | } |
| 1064 | |
David Rientjes | 51b1bd2 | 2010-08-09 17:19:47 -0700 | [diff] [blame] | 1065 | /* |
| 1066 | * Warn that /proc/pid/oom_adj is deprecated, see |
| 1067 | * Documentation/feature-removal-schedule.txt. |
| 1068 | */ |
| 1069 | printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, " |
| 1070 | "please use /proc/%d/oom_score_adj instead.\n", |
| 1071 | current->comm, task_pid_nr(current), |
| 1072 | task_pid_nr(task), task_pid_nr(task)); |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1073 | task->signal->oom_adj = oom_adjust; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1074 | /* |
| 1075 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum |
| 1076 | * value is always attainable. |
| 1077 | */ |
| 1078 | if (task->signal->oom_adj == OOM_ADJUST_MAX) |
| 1079 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; |
| 1080 | else |
| 1081 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / |
| 1082 | -OOM_DISABLE; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1083 | err_sighand: |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1084 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1085 | err_task_lock: |
| 1086 | task_unlock(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1087 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1088 | out: |
| 1089 | return err < 0 ? err : count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | } |
| 1091 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1092 | static const struct file_operations proc_oom_adjust_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | .read = oom_adjust_read, |
| 1094 | .write = oom_adjust_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1095 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | }; |
| 1097 | |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1098 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
| 1099 | size_t count, loff_t *ppos) |
| 1100 | { |
| 1101 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
| 1102 | char buffer[PROC_NUMBUF]; |
| 1103 | int oom_score_adj = OOM_SCORE_ADJ_MIN; |
| 1104 | unsigned long flags; |
| 1105 | size_t len; |
| 1106 | |
| 1107 | if (!task) |
| 1108 | return -ESRCH; |
| 1109 | if (lock_task_sighand(task, &flags)) { |
| 1110 | oom_score_adj = task->signal->oom_score_adj; |
| 1111 | unlock_task_sighand(task, &flags); |
| 1112 | } |
| 1113 | put_task_struct(task); |
| 1114 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); |
| 1115 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 1116 | } |
| 1117 | |
| 1118 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, |
| 1119 | size_t count, loff_t *ppos) |
| 1120 | { |
| 1121 | struct task_struct *task; |
| 1122 | char buffer[PROC_NUMBUF]; |
| 1123 | unsigned long flags; |
| 1124 | long oom_score_adj; |
| 1125 | int err; |
| 1126 | |
| 1127 | memset(buffer, 0, sizeof(buffer)); |
| 1128 | if (count > sizeof(buffer) - 1) |
| 1129 | count = sizeof(buffer) - 1; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1130 | if (copy_from_user(buffer, buf, count)) { |
| 1131 | err = -EFAULT; |
| 1132 | goto out; |
| 1133 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1134 | |
| 1135 | err = strict_strtol(strstrip(buffer), 0, &oom_score_adj); |
| 1136 | if (err) |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1137 | goto out; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1138 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1139 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
| 1140 | err = -EINVAL; |
| 1141 | goto out; |
| 1142 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1143 | |
| 1144 | task = get_proc_task(file->f_path.dentry->d_inode); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1145 | if (!task) { |
| 1146 | err = -ESRCH; |
| 1147 | goto out; |
| 1148 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1149 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1150 | task_lock(task); |
| 1151 | if (!task->mm) { |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1152 | err = -EINVAL; |
| 1153 | goto err_task_lock; |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1154 | } |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1155 | |
| 1156 | if (!lock_task_sighand(task, &flags)) { |
| 1157 | err = -ESRCH; |
| 1158 | goto err_task_lock; |
| 1159 | } |
| 1160 | |
| 1161 | if (oom_score_adj < task->signal->oom_score_adj && |
| 1162 | !capable(CAP_SYS_RESOURCE)) { |
| 1163 | err = -EACCES; |
| 1164 | goto err_sighand; |
| 1165 | } |
| 1166 | |
Ying Han | 3d5992d | 2010-10-26 14:21:23 -0700 | [diff] [blame] | 1167 | if (oom_score_adj != task->signal->oom_score_adj) { |
| 1168 | if (oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1169 | atomic_inc(&task->mm->oom_disable_count); |
| 1170 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1171 | atomic_dec(&task->mm->oom_disable_count); |
| 1172 | } |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1173 | task->signal->oom_score_adj = oom_score_adj; |
| 1174 | /* |
| 1175 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is |
| 1176 | * always attainable. |
| 1177 | */ |
| 1178 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) |
| 1179 | task->signal->oom_adj = OOM_DISABLE; |
| 1180 | else |
| 1181 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / |
| 1182 | OOM_SCORE_ADJ_MAX; |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1183 | err_sighand: |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1184 | unlock_task_sighand(task, &flags); |
David Rientjes | d19d547 | 2010-10-26 14:21:26 -0700 | [diff] [blame] | 1185 | err_task_lock: |
| 1186 | task_unlock(task); |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1187 | put_task_struct(task); |
David Rientjes | 723548b | 2010-10-26 14:21:25 -0700 | [diff] [blame] | 1188 | out: |
| 1189 | return err < 0 ? err : count; |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | static const struct file_operations proc_oom_score_adj_operations = { |
| 1193 | .read = oom_score_adj_read, |
| 1194 | .write = oom_score_adj_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1195 | .llseek = default_llseek, |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 1196 | }; |
| 1197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | #ifdef CONFIG_AUDITSYSCALL |
| 1199 | #define TMPBUFLEN 21 |
| 1200 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
| 1201 | size_t count, loff_t *ppos) |
| 1202 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1203 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1204 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | ssize_t length; |
| 1206 | char tmpbuf[TMPBUFLEN]; |
| 1207 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1208 | if (!task) |
| 1209 | return -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
Al Viro | 0c11b94 | 2008-01-10 04:20:52 -0500 | [diff] [blame] | 1211 | audit_get_loginuid(task)); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1212 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1214 | } |
| 1215 | |
| 1216 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, |
| 1217 | size_t count, loff_t *ppos) |
| 1218 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1219 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | char *page, *tmp; |
| 1221 | ssize_t length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | uid_t loginuid; |
| 1223 | |
| 1224 | if (!capable(CAP_AUDIT_CONTROL)) |
| 1225 | return -EPERM; |
| 1226 | |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1227 | rcu_read_lock(); |
| 1228 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { |
| 1229 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | return -EPERM; |
Paul E. McKenney | 7dc5215 | 2010-02-22 17:04:52 -0800 | [diff] [blame] | 1231 | } |
| 1232 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1234 | if (count >= PAGE_SIZE) |
| 1235 | count = PAGE_SIZE - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
| 1237 | if (*ppos != 0) { |
| 1238 | /* No partial writes. */ |
| 1239 | return -EINVAL; |
| 1240 | } |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1241 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | if (!page) |
| 1243 | return -ENOMEM; |
| 1244 | length = -EFAULT; |
| 1245 | if (copy_from_user(page, buf, count)) |
| 1246 | goto out_free_page; |
| 1247 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1248 | page[count] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | loginuid = simple_strtoul(page, &tmp, 10); |
| 1250 | if (tmp == page) { |
| 1251 | length = -EINVAL; |
| 1252 | goto out_free_page; |
| 1253 | |
| 1254 | } |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1255 | length = audit_set_loginuid(current, loginuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | if (likely(length == 0)) |
| 1257 | length = count; |
| 1258 | |
| 1259 | out_free_page: |
| 1260 | free_page((unsigned long) page); |
| 1261 | return length; |
| 1262 | } |
| 1263 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1264 | static const struct file_operations proc_loginuid_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | .read = proc_loginuid_read, |
| 1266 | .write = proc_loginuid_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1267 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | }; |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1269 | |
| 1270 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, |
| 1271 | size_t count, loff_t *ppos) |
| 1272 | { |
| 1273 | struct inode * inode = file->f_path.dentry->d_inode; |
| 1274 | struct task_struct *task = get_proc_task(inode); |
| 1275 | ssize_t length; |
| 1276 | char tmpbuf[TMPBUFLEN]; |
| 1277 | |
| 1278 | if (!task) |
| 1279 | return -ESRCH; |
| 1280 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| 1281 | audit_get_sessionid(task)); |
| 1282 | put_task_struct(task); |
| 1283 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1284 | } |
| 1285 | |
| 1286 | static const struct file_operations proc_sessionid_operations = { |
| 1287 | .read = proc_sessionid_read, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1288 | .llseek = generic_file_llseek, |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1289 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | #endif |
| 1291 | |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1292 | #ifdef CONFIG_FAULT_INJECTION |
| 1293 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, |
| 1294 | size_t count, loff_t *ppos) |
| 1295 | { |
| 1296 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 1297 | char buffer[PROC_NUMBUF]; |
| 1298 | size_t len; |
| 1299 | int make_it_fail; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1300 | |
| 1301 | if (!task) |
| 1302 | return -ESRCH; |
| 1303 | make_it_fail = task->make_it_fail; |
| 1304 | put_task_struct(task); |
| 1305 | |
| 1306 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1307 | |
| 1308 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1309 | } |
| 1310 | |
| 1311 | static ssize_t proc_fault_inject_write(struct file * file, |
| 1312 | const char __user * buf, size_t count, loff_t *ppos) |
| 1313 | { |
| 1314 | struct task_struct *task; |
| 1315 | char buffer[PROC_NUMBUF], *end; |
| 1316 | int make_it_fail; |
| 1317 | |
| 1318 | if (!capable(CAP_SYS_RESOURCE)) |
| 1319 | return -EPERM; |
| 1320 | memset(buffer, 0, sizeof(buffer)); |
| 1321 | if (count > sizeof(buffer) - 1) |
| 1322 | count = sizeof(buffer) - 1; |
| 1323 | if (copy_from_user(buffer, buf, count)) |
| 1324 | return -EFAULT; |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1325 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
| 1326 | if (*end) |
| 1327 | return -EINVAL; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1328 | task = get_proc_task(file->f_dentry->d_inode); |
| 1329 | if (!task) |
| 1330 | return -ESRCH; |
| 1331 | task->make_it_fail = make_it_fail; |
| 1332 | put_task_struct(task); |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1333 | |
| 1334 | return count; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1335 | } |
| 1336 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1337 | static const struct file_operations proc_fault_inject_operations = { |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1338 | .read = proc_fault_inject_read, |
| 1339 | .write = proc_fault_inject_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 1340 | .llseek = generic_file_llseek, |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1341 | }; |
| 1342 | #endif |
| 1343 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1344 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1345 | #ifdef CONFIG_SCHED_DEBUG |
| 1346 | /* |
| 1347 | * Print out various scheduling related per-task fields: |
| 1348 | */ |
| 1349 | static int sched_show(struct seq_file *m, void *v) |
| 1350 | { |
| 1351 | struct inode *inode = m->private; |
| 1352 | struct task_struct *p; |
| 1353 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1354 | p = get_proc_task(inode); |
| 1355 | if (!p) |
| 1356 | return -ESRCH; |
| 1357 | proc_sched_show_task(p, m); |
| 1358 | |
| 1359 | put_task_struct(p); |
| 1360 | |
| 1361 | return 0; |
| 1362 | } |
| 1363 | |
| 1364 | static ssize_t |
| 1365 | sched_write(struct file *file, const char __user *buf, |
| 1366 | size_t count, loff_t *offset) |
| 1367 | { |
| 1368 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1369 | struct task_struct *p; |
| 1370 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1371 | p = get_proc_task(inode); |
| 1372 | if (!p) |
| 1373 | return -ESRCH; |
| 1374 | proc_sched_set_task(p); |
| 1375 | |
| 1376 | put_task_struct(p); |
| 1377 | |
| 1378 | return count; |
| 1379 | } |
| 1380 | |
| 1381 | static int sched_open(struct inode *inode, struct file *filp) |
| 1382 | { |
| 1383 | int ret; |
| 1384 | |
| 1385 | ret = single_open(filp, sched_show, NULL); |
| 1386 | if (!ret) { |
| 1387 | struct seq_file *m = filp->private_data; |
| 1388 | |
| 1389 | m->private = inode; |
| 1390 | } |
| 1391 | return ret; |
| 1392 | } |
| 1393 | |
| 1394 | static const struct file_operations proc_pid_sched_operations = { |
| 1395 | .open = sched_open, |
| 1396 | .read = seq_read, |
| 1397 | .write = sched_write, |
| 1398 | .llseek = seq_lseek, |
Alexey Dobriyan | 5ea473a | 2007-07-31 00:38:50 -0700 | [diff] [blame] | 1399 | .release = single_release, |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1400 | }; |
| 1401 | |
| 1402 | #endif |
| 1403 | |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1404 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 1405 | /* |
| 1406 | * Print out autogroup related information: |
| 1407 | */ |
| 1408 | static int sched_autogroup_show(struct seq_file *m, void *v) |
| 1409 | { |
| 1410 | struct inode *inode = m->private; |
| 1411 | struct task_struct *p; |
| 1412 | |
| 1413 | p = get_proc_task(inode); |
| 1414 | if (!p) |
| 1415 | return -ESRCH; |
| 1416 | proc_sched_autogroup_show_task(p, m); |
| 1417 | |
| 1418 | put_task_struct(p); |
| 1419 | |
| 1420 | return 0; |
| 1421 | } |
| 1422 | |
| 1423 | static ssize_t |
| 1424 | sched_autogroup_write(struct file *file, const char __user *buf, |
| 1425 | size_t count, loff_t *offset) |
| 1426 | { |
| 1427 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1428 | struct task_struct *p; |
| 1429 | char buffer[PROC_NUMBUF]; |
| 1430 | long nice; |
| 1431 | int err; |
| 1432 | |
| 1433 | memset(buffer, 0, sizeof(buffer)); |
| 1434 | if (count > sizeof(buffer) - 1) |
| 1435 | count = sizeof(buffer) - 1; |
| 1436 | if (copy_from_user(buffer, buf, count)) |
| 1437 | return -EFAULT; |
| 1438 | |
| 1439 | err = strict_strtol(strstrip(buffer), 0, &nice); |
| 1440 | if (err) |
| 1441 | return -EINVAL; |
| 1442 | |
| 1443 | p = get_proc_task(inode); |
| 1444 | if (!p) |
| 1445 | return -ESRCH; |
| 1446 | |
| 1447 | err = nice; |
| 1448 | err = proc_sched_autogroup_set_nice(p, &err); |
| 1449 | if (err) |
| 1450 | count = err; |
| 1451 | |
| 1452 | put_task_struct(p); |
| 1453 | |
| 1454 | return count; |
| 1455 | } |
| 1456 | |
| 1457 | static int sched_autogroup_open(struct inode *inode, struct file *filp) |
| 1458 | { |
| 1459 | int ret; |
| 1460 | |
| 1461 | ret = single_open(filp, sched_autogroup_show, NULL); |
| 1462 | if (!ret) { |
| 1463 | struct seq_file *m = filp->private_data; |
| 1464 | |
| 1465 | m->private = inode; |
| 1466 | } |
| 1467 | return ret; |
| 1468 | } |
| 1469 | |
| 1470 | static const struct file_operations proc_pid_sched_autogroup_operations = { |
| 1471 | .open = sched_autogroup_open, |
| 1472 | .read = seq_read, |
| 1473 | .write = sched_autogroup_write, |
| 1474 | .llseek = seq_lseek, |
| 1475 | .release = single_release, |
| 1476 | }; |
| 1477 | |
| 1478 | #endif /* CONFIG_SCHED_AUTOGROUP */ |
| 1479 | |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1480 | static ssize_t comm_write(struct file *file, const char __user *buf, |
| 1481 | size_t count, loff_t *offset) |
| 1482 | { |
| 1483 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1484 | struct task_struct *p; |
| 1485 | char buffer[TASK_COMM_LEN]; |
| 1486 | |
| 1487 | memset(buffer, 0, sizeof(buffer)); |
| 1488 | if (count > sizeof(buffer) - 1) |
| 1489 | count = sizeof(buffer) - 1; |
| 1490 | if (copy_from_user(buffer, buf, count)) |
| 1491 | return -EFAULT; |
| 1492 | |
| 1493 | p = get_proc_task(inode); |
| 1494 | if (!p) |
| 1495 | return -ESRCH; |
| 1496 | |
| 1497 | if (same_thread_group(current, p)) |
| 1498 | set_task_comm(p, buffer); |
| 1499 | else |
| 1500 | count = -EINVAL; |
| 1501 | |
| 1502 | put_task_struct(p); |
| 1503 | |
| 1504 | return count; |
| 1505 | } |
| 1506 | |
| 1507 | static int comm_show(struct seq_file *m, void *v) |
| 1508 | { |
| 1509 | struct inode *inode = m->private; |
| 1510 | struct task_struct *p; |
| 1511 | |
| 1512 | p = get_proc_task(inode); |
| 1513 | if (!p) |
| 1514 | return -ESRCH; |
| 1515 | |
| 1516 | task_lock(p); |
| 1517 | seq_printf(m, "%s\n", p->comm); |
| 1518 | task_unlock(p); |
| 1519 | |
| 1520 | put_task_struct(p); |
| 1521 | |
| 1522 | return 0; |
| 1523 | } |
| 1524 | |
| 1525 | static int comm_open(struct inode *inode, struct file *filp) |
| 1526 | { |
| 1527 | int ret; |
| 1528 | |
| 1529 | ret = single_open(filp, comm_show, NULL); |
| 1530 | if (!ret) { |
| 1531 | struct seq_file *m = filp->private_data; |
| 1532 | |
| 1533 | m->private = inode; |
| 1534 | } |
| 1535 | return ret; |
| 1536 | } |
| 1537 | |
| 1538 | static const struct file_operations proc_pid_set_comm_operations = { |
| 1539 | .open = comm_open, |
| 1540 | .read = seq_read, |
| 1541 | .write = comm_write, |
| 1542 | .llseek = seq_lseek, |
| 1543 | .release = single_release, |
| 1544 | }; |
| 1545 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1546 | /* |
| 1547 | * We added or removed a vma mapping the executable. The vmas are only mapped |
| 1548 | * during exec and are not mapped with the mmap system call. |
| 1549 | * Callers must hold down_write() on the mm's mmap_sem for these |
| 1550 | */ |
| 1551 | void added_exe_file_vma(struct mm_struct *mm) |
| 1552 | { |
| 1553 | mm->num_exe_file_vmas++; |
| 1554 | } |
| 1555 | |
| 1556 | void removed_exe_file_vma(struct mm_struct *mm) |
| 1557 | { |
| 1558 | mm->num_exe_file_vmas--; |
| 1559 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ |
| 1560 | fput(mm->exe_file); |
| 1561 | mm->exe_file = NULL; |
| 1562 | } |
| 1563 | |
| 1564 | } |
| 1565 | |
| 1566 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) |
| 1567 | { |
| 1568 | if (new_exe_file) |
| 1569 | get_file(new_exe_file); |
| 1570 | if (mm->exe_file) |
| 1571 | fput(mm->exe_file); |
| 1572 | mm->exe_file = new_exe_file; |
| 1573 | mm->num_exe_file_vmas = 0; |
| 1574 | } |
| 1575 | |
| 1576 | struct file *get_mm_exe_file(struct mm_struct *mm) |
| 1577 | { |
| 1578 | struct file *exe_file; |
| 1579 | |
| 1580 | /* We need mmap_sem to protect against races with removal of |
| 1581 | * VM_EXECUTABLE vmas */ |
| 1582 | down_read(&mm->mmap_sem); |
| 1583 | exe_file = mm->exe_file; |
| 1584 | if (exe_file) |
| 1585 | get_file(exe_file); |
| 1586 | up_read(&mm->mmap_sem); |
| 1587 | return exe_file; |
| 1588 | } |
| 1589 | |
| 1590 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) |
| 1591 | { |
| 1592 | /* It's safe to write the exe_file pointer without exe_file_lock because |
| 1593 | * this is called during fork when the task is not yet in /proc */ |
| 1594 | newmm->exe_file = get_mm_exe_file(oldmm); |
| 1595 | } |
| 1596 | |
| 1597 | static int proc_exe_link(struct inode *inode, struct path *exe_path) |
| 1598 | { |
| 1599 | struct task_struct *task; |
| 1600 | struct mm_struct *mm; |
| 1601 | struct file *exe_file; |
| 1602 | |
| 1603 | task = get_proc_task(inode); |
| 1604 | if (!task) |
| 1605 | return -ENOENT; |
| 1606 | mm = get_task_mm(task); |
| 1607 | put_task_struct(task); |
| 1608 | if (!mm) |
| 1609 | return -ENOENT; |
| 1610 | exe_file = get_mm_exe_file(mm); |
| 1611 | mmput(mm); |
| 1612 | if (exe_file) { |
| 1613 | *exe_path = exe_file->f_path; |
| 1614 | path_get(&exe_file->f_path); |
| 1615 | fput(exe_file); |
| 1616 | return 0; |
| 1617 | } else |
| 1618 | return -ENOENT; |
| 1619 | } |
| 1620 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1621 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | { |
| 1623 | struct inode *inode = dentry->d_inode; |
| 1624 | int error = -EACCES; |
| 1625 | |
| 1626 | /* We don't need a base pointer in the /proc filesystem */ |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 1627 | path_put(&nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1629 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1630 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1633 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | out: |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1635 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | } |
| 1637 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1638 | 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] | 1639 | { |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1640 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1641 | char *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | int len; |
| 1643 | |
| 1644 | if (!tmp) |
| 1645 | return -ENOMEM; |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1646 | |
Eric W. Biederman | 7b2a69b | 2010-12-05 15:51:21 -0800 | [diff] [blame] | 1647 | pathname = d_path(path, tmp, PAGE_SIZE); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1648 | len = PTR_ERR(pathname); |
| 1649 | if (IS_ERR(pathname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | goto out; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1651 | len = tmp + PAGE_SIZE - 1 - pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | |
| 1653 | if (len > buflen) |
| 1654 | len = buflen; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1655 | if (copy_to_user(buffer, pathname, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | len = -EFAULT; |
| 1657 | out: |
| 1658 | free_page((unsigned long)tmp); |
| 1659 | return len; |
| 1660 | } |
| 1661 | |
| 1662 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) |
| 1663 | { |
| 1664 | int error = -EACCES; |
| 1665 | struct inode *inode = dentry->d_inode; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1666 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1668 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1669 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1672 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | if (error) |
| 1674 | goto out; |
| 1675 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1676 | error = do_proc_readlink(&path, buffer, buflen); |
| 1677 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | return error; |
| 1680 | } |
| 1681 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1682 | static const struct inode_operations proc_pid_link_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | .readlink = proc_pid_readlink, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1684 | .follow_link = proc_pid_follow_link, |
| 1685 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | }; |
| 1687 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1688 | |
| 1689 | /* building an inode */ |
| 1690 | |
| 1691 | static int task_dumpable(struct task_struct *task) |
| 1692 | { |
| 1693 | int dumpable = 0; |
| 1694 | struct mm_struct *mm; |
| 1695 | |
| 1696 | task_lock(task); |
| 1697 | mm = task->mm; |
| 1698 | if (mm) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 1699 | dumpable = get_dumpable(mm); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1700 | task_unlock(task); |
| 1701 | if(dumpable == 1) |
| 1702 | return 1; |
| 1703 | return 0; |
| 1704 | } |
| 1705 | |
| 1706 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1707 | static 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] | 1708 | { |
| 1709 | struct inode * inode; |
| 1710 | struct proc_inode *ei; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1711 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1712 | |
| 1713 | /* We need a new inode */ |
| 1714 | |
| 1715 | inode = new_inode(sb); |
| 1716 | if (!inode) |
| 1717 | goto out; |
| 1718 | |
| 1719 | /* Common stuff */ |
| 1720 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 1721 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1722 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1723 | inode->i_op = &proc_def_inode_operations; |
| 1724 | |
| 1725 | /* |
| 1726 | * grab the reference to task. |
| 1727 | */ |
Oleg Nesterov | 1a657f78 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 1728 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1729 | if (!ei->pid) |
| 1730 | goto out_unlock; |
| 1731 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1732 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1733 | rcu_read_lock(); |
| 1734 | cred = __task_cred(task); |
| 1735 | inode->i_uid = cred->euid; |
| 1736 | inode->i_gid = cred->egid; |
| 1737 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1738 | } |
| 1739 | security_task_to_inode(task, inode); |
| 1740 | |
| 1741 | out: |
| 1742 | return inode; |
| 1743 | |
| 1744 | out_unlock: |
| 1745 | iput(inode); |
| 1746 | return NULL; |
| 1747 | } |
| 1748 | |
| 1749 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 1750 | { |
| 1751 | struct inode *inode = dentry->d_inode; |
| 1752 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1753 | const struct cred *cred; |
| 1754 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1755 | generic_fillattr(inode, stat); |
| 1756 | |
| 1757 | rcu_read_lock(); |
| 1758 | stat->uid = 0; |
| 1759 | stat->gid = 0; |
| 1760 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
| 1761 | if (task) { |
| 1762 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1763 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1764 | cred = __task_cred(task); |
| 1765 | stat->uid = cred->euid; |
| 1766 | stat->gid = cred->egid; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1767 | } |
| 1768 | } |
| 1769 | rcu_read_unlock(); |
| 1770 | return 0; |
| 1771 | } |
| 1772 | |
| 1773 | /* dentry stuff */ |
| 1774 | |
| 1775 | /* |
| 1776 | * Exceptional case: normally we are not allowed to unhash a busy |
| 1777 | * directory. In this case, however, we can do it - no aliasing problems |
| 1778 | * due to the way we treat inodes. |
| 1779 | * |
| 1780 | * Rewrite the inode's ownerships here because the owning task may have |
| 1781 | * performed a setuid(), etc. |
| 1782 | * |
| 1783 | * Before the /proc/pid/status file was created the only way to read |
| 1784 | * the effective uid of a /process was to stat /proc/pid. Reading |
| 1785 | * /proc/pid/status is slow enough that procps and other packages |
| 1786 | * kept stating /proc/pid. To keep the rules in /proc simple I have |
| 1787 | * made this apply to all per process world readable and executable |
| 1788 | * directories. |
| 1789 | */ |
| 1790 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1791 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1792 | struct inode *inode; |
| 1793 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1794 | const struct cred *cred; |
| 1795 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1796 | if (nd && nd->flags & LOOKUP_RCU) |
| 1797 | return -ECHILD; |
| 1798 | |
| 1799 | inode = dentry->d_inode; |
| 1800 | task = get_proc_task(inode); |
| 1801 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1802 | if (task) { |
| 1803 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1804 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1805 | rcu_read_lock(); |
| 1806 | cred = __task_cred(task); |
| 1807 | inode->i_uid = cred->euid; |
| 1808 | inode->i_gid = cred->egid; |
| 1809 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1810 | } else { |
| 1811 | inode->i_uid = 0; |
| 1812 | inode->i_gid = 0; |
| 1813 | } |
| 1814 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1815 | security_task_to_inode(task, inode); |
| 1816 | put_task_struct(task); |
| 1817 | return 1; |
| 1818 | } |
| 1819 | d_drop(dentry); |
| 1820 | return 0; |
| 1821 | } |
| 1822 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 1823 | static int pid_delete_dentry(const struct dentry * dentry) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1824 | { |
| 1825 | /* Is the task we represent dead? |
| 1826 | * If so, then don't put the dentry on the lru list, |
| 1827 | * kill it immediately. |
| 1828 | */ |
| 1829 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; |
| 1830 | } |
| 1831 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 1832 | static const struct dentry_operations pid_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1833 | { |
| 1834 | .d_revalidate = pid_revalidate, |
| 1835 | .d_delete = pid_delete_dentry, |
| 1836 | }; |
| 1837 | |
| 1838 | /* Lookups */ |
| 1839 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1840 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
| 1841 | struct task_struct *, const void *); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1842 | |
Eric W. Biederman | 1c0d04c | 2006-10-02 02:18:57 -0700 | [diff] [blame] | 1843 | /* |
| 1844 | * Fill a directory entry. |
| 1845 | * |
| 1846 | * If possible create the dcache entry and derive our inode number and |
| 1847 | * file type from dcache entry. |
| 1848 | * |
| 1849 | * Since all of the proc inode numbers are dynamically generated, the inode |
| 1850 | * numbers do not exist until the inode is cache. This means creating the |
| 1851 | * the dcache entry in readdir is necessary to keep the inode numbers |
| 1852 | * reported by readdir in sync with the inode numbers reported |
| 1853 | * by stat. |
| 1854 | */ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1855 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 1856 | char *name, int len, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1857 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1858 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1859 | struct dentry *child, *dir = filp->f_path.dentry; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1860 | struct inode *inode; |
| 1861 | struct qstr qname; |
| 1862 | ino_t ino = 0; |
| 1863 | unsigned type = DT_UNKNOWN; |
| 1864 | |
| 1865 | qname.name = name; |
| 1866 | qname.len = len; |
| 1867 | qname.hash = full_name_hash(name, len); |
| 1868 | |
| 1869 | child = d_lookup(dir, &qname); |
| 1870 | if (!child) { |
| 1871 | struct dentry *new; |
| 1872 | new = d_alloc(dir, &qname); |
| 1873 | if (new) { |
| 1874 | child = instantiate(dir->d_inode, new, task, ptr); |
| 1875 | if (child) |
| 1876 | dput(new); |
| 1877 | else |
| 1878 | child = new; |
| 1879 | } |
| 1880 | } |
| 1881 | if (!child || IS_ERR(child) || !child->d_inode) |
| 1882 | goto end_instantiate; |
| 1883 | inode = child->d_inode; |
| 1884 | if (inode) { |
| 1885 | ino = inode->i_ino; |
| 1886 | type = inode->i_mode >> 12; |
| 1887 | } |
| 1888 | dput(child); |
| 1889 | end_instantiate: |
| 1890 | if (!ino) |
| 1891 | ino = find_inode_number(dir, &qname); |
| 1892 | if (!ino) |
| 1893 | ino = 1; |
| 1894 | return filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1895 | } |
| 1896 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1897 | static unsigned name_to_int(struct dentry *dentry) |
| 1898 | { |
| 1899 | const char *name = dentry->d_name.name; |
| 1900 | int len = dentry->d_name.len; |
| 1901 | unsigned n = 0; |
| 1902 | |
| 1903 | if (len > 1 && *name == '0') |
| 1904 | goto out; |
| 1905 | while (len-- > 0) { |
| 1906 | unsigned c = *name++ - '0'; |
| 1907 | if (c > 9) |
| 1908 | goto out; |
| 1909 | if (n >= (~0U-9)/10) |
| 1910 | goto out; |
| 1911 | n *= 10; |
| 1912 | n += c; |
| 1913 | } |
| 1914 | return n; |
| 1915 | out: |
| 1916 | return ~0U; |
| 1917 | } |
| 1918 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1919 | #define PROC_FDINFO_MAX 64 |
| 1920 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1921 | 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] | 1922 | { |
| 1923 | struct task_struct *task = get_proc_task(inode); |
| 1924 | struct files_struct *files = NULL; |
| 1925 | struct file *file; |
| 1926 | int fd = proc_fd(inode); |
| 1927 | |
| 1928 | if (task) { |
| 1929 | files = get_files_struct(task); |
| 1930 | put_task_struct(task); |
| 1931 | } |
| 1932 | if (files) { |
| 1933 | /* |
| 1934 | * We are not taking a ref to the file structure, so we must |
| 1935 | * hold ->file_lock. |
| 1936 | */ |
| 1937 | spin_lock(&files->file_lock); |
| 1938 | file = fcheck_files(files, fd); |
| 1939 | if (file) { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1940 | if (path) { |
| 1941 | *path = file->f_path; |
| 1942 | path_get(&file->f_path); |
| 1943 | } |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1944 | if (info) |
| 1945 | snprintf(info, PROC_FDINFO_MAX, |
| 1946 | "pos:\t%lli\n" |
| 1947 | "flags:\t0%o\n", |
| 1948 | (long long) file->f_pos, |
| 1949 | file->f_flags); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1950 | spin_unlock(&files->file_lock); |
| 1951 | put_files_struct(files); |
| 1952 | return 0; |
| 1953 | } |
| 1954 | spin_unlock(&files->file_lock); |
| 1955 | put_files_struct(files); |
| 1956 | } |
| 1957 | return -ENOENT; |
| 1958 | } |
| 1959 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1960 | static int proc_fd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1961 | { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1962 | return proc_fd_info(inode, path, NULL); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1963 | } |
| 1964 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1965 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1966 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1967 | struct inode *inode; |
| 1968 | struct task_struct *task; |
| 1969 | int fd; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1970 | struct files_struct *files; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1971 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1972 | |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 1973 | if (nd && nd->flags & LOOKUP_RCU) |
| 1974 | return -ECHILD; |
| 1975 | |
| 1976 | inode = dentry->d_inode; |
| 1977 | task = get_proc_task(inode); |
| 1978 | fd = proc_fd(inode); |
| 1979 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1980 | if (task) { |
| 1981 | files = get_files_struct(task); |
| 1982 | if (files) { |
| 1983 | rcu_read_lock(); |
| 1984 | if (fcheck_files(files, fd)) { |
| 1985 | rcu_read_unlock(); |
| 1986 | put_files_struct(files); |
| 1987 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1988 | rcu_read_lock(); |
| 1989 | cred = __task_cred(task); |
| 1990 | inode->i_uid = cred->euid; |
| 1991 | inode->i_gid = cred->egid; |
| 1992 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1993 | } else { |
| 1994 | inode->i_uid = 0; |
| 1995 | inode->i_gid = 0; |
| 1996 | } |
| 1997 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1998 | security_task_to_inode(task, inode); |
| 1999 | put_task_struct(task); |
| 2000 | return 1; |
| 2001 | } |
| 2002 | rcu_read_unlock(); |
| 2003 | put_files_struct(files); |
| 2004 | } |
| 2005 | put_task_struct(task); |
| 2006 | } |
| 2007 | d_drop(dentry); |
| 2008 | return 0; |
| 2009 | } |
| 2010 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 2011 | static const struct dentry_operations tid_fd_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2012 | { |
| 2013 | .d_revalidate = tid_fd_revalidate, |
| 2014 | .d_delete = pid_delete_dentry, |
| 2015 | }; |
| 2016 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2017 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2018 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2019 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2020 | unsigned fd = *(const unsigned *)ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2021 | struct file *file; |
| 2022 | struct files_struct *files; |
| 2023 | struct inode *inode; |
| 2024 | struct proc_inode *ei; |
| 2025 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2026 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2027 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2028 | if (!inode) |
| 2029 | goto out; |
| 2030 | ei = PROC_I(inode); |
| 2031 | ei->fd = fd; |
| 2032 | files = get_files_struct(task); |
| 2033 | if (!files) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2034 | goto out_iput; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2035 | inode->i_mode = S_IFLNK; |
| 2036 | |
| 2037 | /* |
| 2038 | * We are not taking a ref to the file structure, so we must |
| 2039 | * hold ->file_lock. |
| 2040 | */ |
| 2041 | spin_lock(&files->file_lock); |
| 2042 | file = fcheck_files(files, fd); |
| 2043 | if (!file) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2044 | goto out_unlock; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 2045 | if (file->f_mode & FMODE_READ) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2046 | inode->i_mode |= S_IRUSR | S_IXUSR; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 2047 | if (file->f_mode & FMODE_WRITE) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2048 | inode->i_mode |= S_IWUSR | S_IXUSR; |
| 2049 | spin_unlock(&files->file_lock); |
| 2050 | put_files_struct(files); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2051 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2052 | inode->i_op = &proc_pid_link_inode_operations; |
| 2053 | inode->i_size = 64; |
| 2054 | ei->op.proc_get_link = proc_fd_link; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2055 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2056 | d_add(dentry, inode); |
| 2057 | /* Close the race of the process dying before we return the dentry */ |
| 2058 | if (tid_fd_revalidate(dentry, NULL)) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2059 | error = NULL; |
| 2060 | |
| 2061 | out: |
| 2062 | return error; |
| 2063 | out_unlock: |
| 2064 | spin_unlock(&files->file_lock); |
| 2065 | put_files_struct(files); |
| 2066 | out_iput: |
| 2067 | iput(inode); |
| 2068 | goto out; |
| 2069 | } |
| 2070 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2071 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
| 2072 | struct dentry *dentry, |
| 2073 | instantiate_t instantiate) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2074 | { |
| 2075 | struct task_struct *task = get_proc_task(dir); |
| 2076 | unsigned fd = name_to_int(dentry); |
| 2077 | struct dentry *result = ERR_PTR(-ENOENT); |
| 2078 | |
| 2079 | if (!task) |
| 2080 | goto out_no_task; |
| 2081 | if (fd == ~0U) |
| 2082 | goto out; |
| 2083 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2084 | result = instantiate(dir, dentry, task, &fd); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2085 | out: |
| 2086 | put_task_struct(task); |
| 2087 | out_no_task: |
| 2088 | return result; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2089 | } |
| 2090 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2091 | static int proc_readfd_common(struct file * filp, void * dirent, |
| 2092 | filldir_t filldir, instantiate_t instantiate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2094 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 2095 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2096 | struct task_struct *p = get_proc_task(inode); |
Pavel Emelyanov | 457c251 | 2007-10-18 23:40:43 -0700 | [diff] [blame] | 2097 | unsigned int fd, ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | struct files_struct * files; |
| 2100 | |
| 2101 | retval = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2102 | if (!p) |
| 2103 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2105 | |
| 2106 | fd = filp->f_pos; |
| 2107 | switch (fd) { |
| 2108 | case 0: |
| 2109 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
| 2110 | goto out; |
| 2111 | filp->f_pos++; |
| 2112 | case 1: |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 2113 | ino = parent_ino(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) |
| 2115 | goto out; |
| 2116 | filp->f_pos++; |
| 2117 | default: |
| 2118 | files = get_files_struct(p); |
| 2119 | if (!files) |
| 2120 | goto out; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2121 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | for (fd = filp->f_pos-2; |
Al Viro | 9b4f526 | 2008-04-22 01:32:44 -0400 | [diff] [blame] | 2123 | fd < files_fdtable(files)->max_fds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | fd++, filp->f_pos++) { |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2125 | char name[PROC_NUMBUF]; |
| 2126 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | |
| 2128 | if (!fcheck_files(files, fd)) |
| 2129 | continue; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2130 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2132 | len = snprintf(name, sizeof(name), "%d", fd); |
| 2133 | if (proc_fill_cache(filp, dirent, filldir, |
| 2134 | name, len, instantiate, |
| 2135 | p, &fd) < 0) { |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2136 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | break; |
| 2138 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2139 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2140 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 2141 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2142 | put_files_struct(files); |
| 2143 | } |
| 2144 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2145 | put_task_struct(p); |
| 2146 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | return retval; |
| 2148 | } |
| 2149 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2150 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
| 2151 | struct nameidata *nd) |
| 2152 | { |
| 2153 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); |
| 2154 | } |
| 2155 | |
| 2156 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) |
| 2157 | { |
| 2158 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); |
| 2159 | } |
| 2160 | |
| 2161 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, |
| 2162 | size_t len, loff_t *ppos) |
| 2163 | { |
| 2164 | char tmp[PROC_FDINFO_MAX]; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 2165 | 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] | 2166 | if (!err) |
| 2167 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); |
| 2168 | return err; |
| 2169 | } |
| 2170 | |
| 2171 | static const struct file_operations proc_fdinfo_file_operations = { |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2172 | .open = nonseekable_open, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2173 | .read = proc_fdinfo_read, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2174 | .llseek = no_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2175 | }; |
| 2176 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2177 | static const struct file_operations proc_fd_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | .read = generic_read_dir, |
| 2179 | .readdir = proc_readfd, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2180 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | }; |
| 2182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | /* |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2184 | * /proc/pid/fd needs a special permission handler so that a process can still |
| 2185 | * access /proc/self/fd after it has executed a setuid(). |
| 2186 | */ |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 2187 | static int proc_fd_permission(struct inode *inode, int mask, unsigned int flags) |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2188 | { |
| 2189 | int rv; |
| 2190 | |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 2191 | if (flags & IPERM_FLAG_RCU) |
| 2192 | return -ECHILD; |
| 2193 | rv = generic_permission(inode, mask, flags, NULL); |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2194 | if (rv == 0) |
| 2195 | return 0; |
| 2196 | if (task_pid(current) == proc_pid(inode)) |
| 2197 | rv = 0; |
| 2198 | return rv; |
| 2199 | } |
| 2200 | |
| 2201 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | * proc directories can do almost nothing.. |
| 2203 | */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2204 | static const struct inode_operations proc_fd_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | .lookup = proc_lookupfd, |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 2206 | .permission = proc_fd_permission, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2207 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2208 | }; |
| 2209 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2210 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
| 2211 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
| 2212 | { |
| 2213 | unsigned fd = *(unsigned *)ptr; |
| 2214 | struct inode *inode; |
| 2215 | struct proc_inode *ei; |
| 2216 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2217 | |
| 2218 | inode = proc_pid_make_inode(dir->i_sb, task); |
| 2219 | if (!inode) |
| 2220 | goto out; |
| 2221 | ei = PROC_I(inode); |
| 2222 | ei->fd = fd; |
| 2223 | inode->i_mode = S_IFREG | S_IRUSR; |
| 2224 | inode->i_fop = &proc_fdinfo_file_operations; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2225 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2226 | d_add(dentry, inode); |
| 2227 | /* Close the race of the process dying before we return the dentry */ |
| 2228 | if (tid_fd_revalidate(dentry, NULL)) |
| 2229 | error = NULL; |
| 2230 | |
| 2231 | out: |
| 2232 | return error; |
| 2233 | } |
| 2234 | |
| 2235 | static struct dentry *proc_lookupfdinfo(struct inode *dir, |
| 2236 | struct dentry *dentry, |
| 2237 | struct nameidata *nd) |
| 2238 | { |
| 2239 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); |
| 2240 | } |
| 2241 | |
| 2242 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) |
| 2243 | { |
| 2244 | return proc_readfd_common(filp, dirent, filldir, |
| 2245 | proc_fdinfo_instantiate); |
| 2246 | } |
| 2247 | |
| 2248 | static const struct file_operations proc_fdinfo_operations = { |
| 2249 | .read = generic_read_dir, |
| 2250 | .readdir = proc_readfdinfo, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2251 | .llseek = default_llseek, |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 2252 | }; |
| 2253 | |
| 2254 | /* |
| 2255 | * proc directories can do almost nothing.. |
| 2256 | */ |
| 2257 | static const struct inode_operations proc_fdinfo_inode_operations = { |
| 2258 | .lookup = proc_lookupfdinfo, |
| 2259 | .setattr = proc_setattr, |
| 2260 | }; |
| 2261 | |
| 2262 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2263 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2264 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2265 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2266 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2267 | struct inode *inode; |
| 2268 | struct proc_inode *ei; |
KOSAKI Motohiro | bd6daba | 2009-05-28 14:34:21 -0700 | [diff] [blame] | 2269 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2270 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2271 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2272 | if (!inode) |
| 2273 | goto out; |
| 2274 | |
| 2275 | ei = PROC_I(inode); |
| 2276 | inode->i_mode = p->mode; |
| 2277 | if (S_ISDIR(inode->i_mode)) |
| 2278 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ |
| 2279 | if (p->iop) |
| 2280 | inode->i_op = p->iop; |
| 2281 | if (p->fop) |
| 2282 | inode->i_fop = p->fop; |
| 2283 | ei->op = p->op; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2284 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2285 | d_add(dentry, inode); |
| 2286 | /* Close the race of the process dying before we return the dentry */ |
| 2287 | if (pid_revalidate(dentry, NULL)) |
| 2288 | error = NULL; |
| 2289 | out: |
| 2290 | return error; |
| 2291 | } |
| 2292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | static struct dentry *proc_pident_lookup(struct inode *dir, |
| 2294 | struct dentry *dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2295 | const struct pid_entry *ents, |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2296 | unsigned int nents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2298 | struct dentry *error; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2299 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2300 | const struct pid_entry *p, *last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2302 | error = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2304 | if (!task) |
| 2305 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2307 | /* |
| 2308 | * Yes, it does not scale. And it should not. Don't add |
| 2309 | * new entries into /proc/<tgid>/ without very good reasons. |
| 2310 | */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2311 | last = &ents[nents - 1]; |
| 2312 | for (p = ents; p <= last; p++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | if (p->len != dentry->d_name.len) |
| 2314 | continue; |
| 2315 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2316 | break; |
| 2317 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2318 | if (p > last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | goto out; |
| 2320 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2321 | error = proc_pident_instantiate(dir, dentry, task, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2323 | put_task_struct(task); |
| 2324 | out_no_task: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2325 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | } |
| 2327 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2328 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
| 2329 | 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] | 2330 | { |
| 2331 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2332 | proc_pident_instantiate, task, p); |
| 2333 | } |
| 2334 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2335 | static int proc_pident_readdir(struct file *filp, |
| 2336 | void *dirent, filldir_t filldir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2337 | const struct pid_entry *ents, unsigned int nents) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2338 | { |
| 2339 | int i; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2340 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2341 | struct inode *inode = dentry->d_inode; |
| 2342 | struct task_struct *task = get_proc_task(inode); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2343 | const struct pid_entry *p, *last; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2344 | ino_t ino; |
| 2345 | int ret; |
| 2346 | |
| 2347 | ret = -ENOENT; |
| 2348 | if (!task) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2349 | goto out_no_task; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2350 | |
| 2351 | ret = 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2352 | i = filp->f_pos; |
| 2353 | switch (i) { |
| 2354 | case 0: |
| 2355 | ino = inode->i_ino; |
| 2356 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| 2357 | goto out; |
| 2358 | i++; |
| 2359 | filp->f_pos++; |
| 2360 | /* fall through */ |
| 2361 | case 1: |
| 2362 | ino = parent_ino(dentry); |
| 2363 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| 2364 | goto out; |
| 2365 | i++; |
| 2366 | filp->f_pos++; |
| 2367 | /* fall through */ |
| 2368 | default: |
| 2369 | i -= 2; |
| 2370 | if (i >= nents) { |
| 2371 | ret = 1; |
| 2372 | goto out; |
| 2373 | } |
| 2374 | p = ents + i; |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2375 | last = &ents[nents - 1]; |
| 2376 | while (p <= last) { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2377 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2378 | goto out; |
| 2379 | filp->f_pos++; |
| 2380 | p++; |
| 2381 | } |
| 2382 | } |
| 2383 | |
| 2384 | ret = 1; |
| 2385 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2386 | put_task_struct(task); |
| 2387 | out_no_task: |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2388 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2389 | } |
| 2390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | #ifdef CONFIG_SECURITY |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2392 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, |
| 2393 | size_t count, loff_t *ppos) |
| 2394 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2395 | struct inode * inode = file->f_path.dentry->d_inode; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2396 | char *p = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2397 | ssize_t length; |
| 2398 | struct task_struct *task = get_proc_task(inode); |
| 2399 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2400 | if (!task) |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2401 | return -ESRCH; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2402 | |
| 2403 | length = security_getprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2404 | (char*)file->f_path.dentry->d_name.name, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2405 | &p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2406 | put_task_struct(task); |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2407 | if (length > 0) |
| 2408 | length = simple_read_from_buffer(buf, count, ppos, p, length); |
| 2409 | kfree(p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2410 | return length; |
| 2411 | } |
| 2412 | |
| 2413 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| 2414 | size_t count, loff_t *ppos) |
| 2415 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2416 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2417 | char *page; |
| 2418 | ssize_t length; |
| 2419 | struct task_struct *task = get_proc_task(inode); |
| 2420 | |
| 2421 | length = -ESRCH; |
| 2422 | if (!task) |
| 2423 | goto out_no_task; |
| 2424 | if (count > PAGE_SIZE) |
| 2425 | count = PAGE_SIZE; |
| 2426 | |
| 2427 | /* No partial writes. */ |
| 2428 | length = -EINVAL; |
| 2429 | if (*ppos != 0) |
| 2430 | goto out; |
| 2431 | |
| 2432 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 2433 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2434 | if (!page) |
| 2435 | goto out; |
| 2436 | |
| 2437 | length = -EFAULT; |
| 2438 | if (copy_from_user(page, buf, count)) |
| 2439 | goto out_free; |
| 2440 | |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2441 | /* Guard against adverse ptrace interaction */ |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2442 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2443 | if (length < 0) |
| 2444 | goto out_free; |
| 2445 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2446 | length = security_setprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2447 | (char*)file->f_path.dentry->d_name.name, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2448 | (void*)page, count); |
KOSAKI Motohiro | 9b1bf12 | 2010-10-27 15:34:08 -0700 | [diff] [blame] | 2449 | mutex_unlock(&task->signal->cred_guard_mutex); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2450 | out_free: |
| 2451 | free_page((unsigned long) page); |
| 2452 | out: |
| 2453 | put_task_struct(task); |
| 2454 | out_no_task: |
| 2455 | return length; |
| 2456 | } |
| 2457 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2458 | static const struct file_operations proc_pid_attr_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2459 | .read = proc_pid_attr_read, |
| 2460 | .write = proc_pid_attr_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2461 | .llseek = generic_file_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2462 | }; |
| 2463 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2464 | static const struct pid_entry attr_dir_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2465 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2466 | REG("prev", S_IRUGO, proc_pid_attr_operations), |
| 2467 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2468 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2469 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2470 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2471 | }; |
| 2472 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2473 | static int proc_attr_dir_readdir(struct file * filp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2474 | void * dirent, filldir_t filldir) |
| 2475 | { |
| 2476 | return proc_pident_readdir(filp,dirent,filldir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2477 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | } |
| 2479 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2480 | static const struct file_operations proc_attr_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2481 | .read = generic_read_dir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2482 | .readdir = proc_attr_dir_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2483 | .llseek = default_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | }; |
| 2485 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2486 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | struct dentry *dentry, struct nameidata *nd) |
| 2488 | { |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2489 | return proc_pident_lookup(dir, dentry, |
| 2490 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | } |
| 2492 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2493 | static const struct inode_operations proc_attr_dir_inode_operations = { |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2494 | .lookup = proc_attr_dir_lookup, |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2495 | .getattr = pid_getattr, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2496 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2497 | }; |
| 2498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | #endif |
| 2500 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2501 | #ifdef CONFIG_ELF_CORE |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2502 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
| 2503 | size_t count, loff_t *ppos) |
| 2504 | { |
| 2505 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 2506 | struct mm_struct *mm; |
| 2507 | char buffer[PROC_NUMBUF]; |
| 2508 | size_t len; |
| 2509 | int ret; |
| 2510 | |
| 2511 | if (!task) |
| 2512 | return -ESRCH; |
| 2513 | |
| 2514 | ret = 0; |
| 2515 | mm = get_task_mm(task); |
| 2516 | if (mm) { |
| 2517 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", |
| 2518 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> |
| 2519 | MMF_DUMP_FILTER_SHIFT)); |
| 2520 | mmput(mm); |
| 2521 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 2522 | } |
| 2523 | |
| 2524 | put_task_struct(task); |
| 2525 | |
| 2526 | return ret; |
| 2527 | } |
| 2528 | |
| 2529 | static ssize_t proc_coredump_filter_write(struct file *file, |
| 2530 | const char __user *buf, |
| 2531 | size_t count, |
| 2532 | loff_t *ppos) |
| 2533 | { |
| 2534 | struct task_struct *task; |
| 2535 | struct mm_struct *mm; |
| 2536 | char buffer[PROC_NUMBUF], *end; |
| 2537 | unsigned int val; |
| 2538 | int ret; |
| 2539 | int i; |
| 2540 | unsigned long mask; |
| 2541 | |
| 2542 | ret = -EFAULT; |
| 2543 | memset(buffer, 0, sizeof(buffer)); |
| 2544 | if (count > sizeof(buffer) - 1) |
| 2545 | count = sizeof(buffer) - 1; |
| 2546 | if (copy_from_user(buffer, buf, count)) |
| 2547 | goto out_no_task; |
| 2548 | |
| 2549 | ret = -EINVAL; |
| 2550 | val = (unsigned int)simple_strtoul(buffer, &end, 0); |
| 2551 | if (*end == '\n') |
| 2552 | end++; |
| 2553 | if (end - buffer == 0) |
| 2554 | goto out_no_task; |
| 2555 | |
| 2556 | ret = -ESRCH; |
| 2557 | task = get_proc_task(file->f_dentry->d_inode); |
| 2558 | if (!task) |
| 2559 | goto out_no_task; |
| 2560 | |
| 2561 | ret = end - buffer; |
| 2562 | mm = get_task_mm(task); |
| 2563 | if (!mm) |
| 2564 | goto out_no_mm; |
| 2565 | |
| 2566 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { |
| 2567 | if (val & mask) |
| 2568 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2569 | else |
| 2570 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2571 | } |
| 2572 | |
| 2573 | mmput(mm); |
| 2574 | out_no_mm: |
| 2575 | put_task_struct(task); |
| 2576 | out_no_task: |
| 2577 | return ret; |
| 2578 | } |
| 2579 | |
| 2580 | static const struct file_operations proc_coredump_filter_operations = { |
| 2581 | .read = proc_coredump_filter_read, |
| 2582 | .write = proc_coredump_filter_write, |
Arnd Bergmann | 87df842 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 2583 | .llseek = generic_file_llseek, |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2584 | }; |
| 2585 | #endif |
| 2586 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2587 | /* |
| 2588 | * /proc/self: |
| 2589 | */ |
| 2590 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| 2591 | int buflen) |
| 2592 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2593 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2594 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2595 | char tmp[PROC_NUMBUF]; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2596 | if (!tgid) |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2597 | return -ENOENT; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2598 | sprintf(tmp, "%d", tgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | return vfs_readlink(dentry,buffer,buflen,tmp); |
| 2600 | } |
| 2601 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 2602 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2604 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2605 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2606 | char *name = ERR_PTR(-ENOENT); |
| 2607 | if (tgid) { |
| 2608 | name = __getname(); |
| 2609 | if (!name) |
| 2610 | name = ERR_PTR(-ENOMEM); |
| 2611 | else |
| 2612 | sprintf(name, "%d", tgid); |
| 2613 | } |
| 2614 | nd_set_link(nd, name); |
| 2615 | return NULL; |
| 2616 | } |
| 2617 | |
| 2618 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, |
| 2619 | void *cookie) |
| 2620 | { |
| 2621 | char *s = nd_get_link(nd); |
| 2622 | if (!IS_ERR(s)) |
| 2623 | __putname(s); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2624 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2625 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2626 | static const struct inode_operations proc_self_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2627 | .readlink = proc_self_readlink, |
| 2628 | .follow_link = proc_self_follow_link, |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame] | 2629 | .put_link = proc_self_put_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | }; |
| 2631 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2632 | /* |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2633 | * proc base |
| 2634 | * |
| 2635 | * These are the directory entries in the root directory of /proc |
| 2636 | * that properly belong to the /proc filesystem, as they describe |
| 2637 | * describe something that is process related. |
| 2638 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2639 | static const struct pid_entry proc_base_stuff[] = { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2640 | NOD("self", S_IFLNK|S_IRWXUGO, |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2641 | &proc_self_inode_operations, NULL, {}), |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2642 | }; |
| 2643 | |
| 2644 | /* |
| 2645 | * Exceptional case: normally we are not allowed to unhash a busy |
| 2646 | * directory. In this case, however, we can do it - no aliasing problems |
| 2647 | * due to the way we treat inodes. |
| 2648 | */ |
| 2649 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 2650 | { |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 2651 | struct inode *inode; |
| 2652 | struct task_struct *task; |
| 2653 | |
| 2654 | if (nd->flags & LOOKUP_RCU) |
| 2655 | return -ECHILD; |
| 2656 | |
| 2657 | inode = dentry->d_inode; |
| 2658 | task = get_proc_task(inode); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2659 | if (task) { |
| 2660 | put_task_struct(task); |
| 2661 | return 1; |
| 2662 | } |
| 2663 | d_drop(dentry); |
| 2664 | return 0; |
| 2665 | } |
| 2666 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 2667 | static const struct dentry_operations proc_base_dentry_operations = |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2668 | { |
| 2669 | .d_revalidate = proc_base_revalidate, |
| 2670 | .d_delete = pid_delete_dentry, |
| 2671 | }; |
| 2672 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2673 | static struct dentry *proc_base_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2674 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2675 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2676 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2677 | struct inode *inode; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2678 | struct proc_inode *ei; |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 2679 | struct dentry *error; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2680 | |
| 2681 | /* Allocate the inode */ |
| 2682 | error = ERR_PTR(-ENOMEM); |
| 2683 | inode = new_inode(dir->i_sb); |
| 2684 | if (!inode) |
| 2685 | goto out; |
| 2686 | |
| 2687 | /* Initialize the inode */ |
| 2688 | ei = PROC_I(inode); |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 2689 | inode->i_ino = get_next_ino(); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2690 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2691 | |
| 2692 | /* |
| 2693 | * grab the reference to the task. |
| 2694 | */ |
Oleg Nesterov | 1a657f78 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 2695 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2696 | if (!ei->pid) |
| 2697 | goto out_iput; |
| 2698 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2699 | inode->i_mode = p->mode; |
| 2700 | if (S_ISDIR(inode->i_mode)) |
| 2701 | inode->i_nlink = 2; |
| 2702 | if (S_ISLNK(inode->i_mode)) |
| 2703 | inode->i_size = 64; |
| 2704 | if (p->iop) |
| 2705 | inode->i_op = p->iop; |
| 2706 | if (p->fop) |
| 2707 | inode->i_fop = p->fop; |
| 2708 | ei->op = p->op; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 2709 | d_set_d_op(dentry, &proc_base_dentry_operations); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2710 | d_add(dentry, inode); |
| 2711 | error = NULL; |
| 2712 | out: |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2713 | return error; |
| 2714 | out_iput: |
| 2715 | iput(inode); |
| 2716 | goto out; |
| 2717 | } |
| 2718 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2719 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
| 2720 | { |
| 2721 | struct dentry *error; |
| 2722 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2723 | const struct pid_entry *p, *last; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2724 | |
| 2725 | error = ERR_PTR(-ENOENT); |
| 2726 | |
| 2727 | if (!task) |
| 2728 | goto out_no_task; |
| 2729 | |
| 2730 | /* Lookup the directory entry */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2731 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
| 2732 | for (p = proc_base_stuff; p <= last; p++) { |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2733 | if (p->len != dentry->d_name.len) |
| 2734 | continue; |
| 2735 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2736 | break; |
| 2737 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2738 | if (p > last) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2739 | goto out; |
| 2740 | |
| 2741 | error = proc_base_instantiate(dir, dentry, task, p); |
| 2742 | |
| 2743 | out: |
| 2744 | put_task_struct(task); |
| 2745 | out_no_task: |
| 2746 | return error; |
| 2747 | } |
| 2748 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2749 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
| 2750 | 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] | 2751 | { |
| 2752 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2753 | proc_base_instantiate, task, p); |
| 2754 | } |
| 2755 | |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2756 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2757 | 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] | 2758 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2759 | struct task_io_accounting acct = task->ioac; |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2760 | unsigned long flags; |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2761 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2762 | if (whole && lock_task_sighand(task, &flags)) { |
| 2763 | struct task_struct *t = task; |
Andrea Righi | b2d002d | 2008-07-26 15:22:27 -0700 | [diff] [blame] | 2764 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2765 | task_io_accounting_add(&acct, &task->signal->ioac); |
| 2766 | while_each_thread(task, t) |
| 2767 | task_io_accounting_add(&acct, &t->ioac); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2768 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2769 | unlock_task_sighand(task, &flags); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2770 | } |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2771 | return sprintf(buffer, |
| 2772 | "rchar: %llu\n" |
| 2773 | "wchar: %llu\n" |
| 2774 | "syscr: %llu\n" |
| 2775 | "syscw: %llu\n" |
| 2776 | "read_bytes: %llu\n" |
| 2777 | "write_bytes: %llu\n" |
| 2778 | "cancelled_write_bytes: %llu\n", |
Alexander Beregalov | 7c44319 | 2008-08-05 13:01:34 -0700 | [diff] [blame] | 2779 | (unsigned long long)acct.rchar, |
| 2780 | (unsigned long long)acct.wchar, |
| 2781 | (unsigned long long)acct.syscr, |
| 2782 | (unsigned long long)acct.syscw, |
| 2783 | (unsigned long long)acct.read_bytes, |
| 2784 | (unsigned long long)acct.write_bytes, |
| 2785 | (unsigned long long)acct.cancelled_write_bytes); |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2786 | } |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2787 | |
| 2788 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) |
| 2789 | { |
| 2790 | return do_io_accounting(task, buffer, 0); |
| 2791 | } |
| 2792 | |
| 2793 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) |
| 2794 | { |
| 2795 | return do_io_accounting(task, buffer, 1); |
| 2796 | } |
| 2797 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2798 | |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2799 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
| 2800 | struct pid *pid, struct task_struct *task) |
| 2801 | { |
| 2802 | seq_printf(m, "%08x\n", task->personality); |
| 2803 | return 0; |
| 2804 | } |
| 2805 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2806 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2807 | * Thread groups |
| 2808 | */ |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2809 | static const struct file_operations proc_task_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2810 | static const struct inode_operations proc_task_inode_operations; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2811 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2812 | static const struct pid_entry tgid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2813 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
| 2814 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2815 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
Andrew Morton | b2211a3 | 2008-03-11 18:03:35 -0700 | [diff] [blame] | 2816 | #ifdef CONFIG_NET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2817 | 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] | 2818 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2819 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2820 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2821 | ONE("status", S_IRUGO, proc_pid_status), |
| 2822 | ONE("personality", S_IRUSR, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 2823 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2824 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2825 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2826 | #endif |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 2827 | #ifdef CONFIG_SCHED_AUTOGROUP |
| 2828 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), |
| 2829 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 2830 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2831 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2832 | INF("syscall", S_IRUSR, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2833 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2834 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2835 | ONE("stat", S_IRUGO, proc_tgid_stat), |
| 2836 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2837 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2838 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2839 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2840 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2841 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2842 | LNK("cwd", proc_cwd_link), |
| 2843 | LNK("root", proc_root_link), |
| 2844 | LNK("exe", proc_exe_link), |
| 2845 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2846 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
| 2847 | REG("mountstats", S_IRUSR, proc_mountstats_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2848 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2849 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2850 | REG("smaps", S_IRUGO, proc_smaps_operations), |
| 2851 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2852 | #endif |
| 2853 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2854 | 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] | 2855 | #endif |
| 2856 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2857 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2858 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2859 | #ifdef CONFIG_STACKTRACE |
| 2860 | ONE("stack", S_IRUSR, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2861 | #endif |
| 2862 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2863 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2864 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2865 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2866 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2867 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2868 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2869 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2870 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2871 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2872 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2873 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2874 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2875 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 2876 | 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] | 2877 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2878 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2879 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2880 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2881 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2882 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2883 | #endif |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2884 | #ifdef CONFIG_ELF_CORE |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2885 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2886 | #endif |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2887 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2888 | INF("io", S_IRUGO, proc_tgid_io_accounting), |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2889 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2890 | }; |
| 2891 | |
| 2892 | static int proc_tgid_base_readdir(struct file * filp, |
| 2893 | void * dirent, filldir_t filldir) |
| 2894 | { |
| 2895 | return proc_pident_readdir(filp,dirent,filldir, |
| 2896 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
| 2897 | } |
| 2898 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2899 | static const struct file_operations proc_tgid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2900 | .read = generic_read_dir, |
| 2901 | .readdir = proc_tgid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2902 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2903 | }; |
| 2904 | |
| 2905 | 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] | 2906 | return proc_pident_lookup(dir, dentry, |
| 2907 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2908 | } |
| 2909 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2910 | static const struct inode_operations proc_tgid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2911 | .lookup = proc_tgid_base_lookup, |
| 2912 | .getattr = pid_getattr, |
| 2913 | .setattr = proc_setattr, |
| 2914 | }; |
| 2915 | |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2916 | 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] | 2917 | { |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2918 | struct dentry *dentry, *leader, *dir; |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2919 | char buf[PROC_NUMBUF]; |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2920 | struct qstr name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2922 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2923 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| 2924 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2925 | if (dentry) { |
Sukadev Bhattiprolu | 29f12ca | 2009-11-11 14:26:32 -0800 | [diff] [blame] | 2926 | shrink_dcache_parent(dentry); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2927 | d_drop(dentry); |
| 2928 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2929 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2930 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2931 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2932 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
| 2933 | leader = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2934 | if (!leader) |
| 2935 | goto out; |
| 2936 | |
| 2937 | name.name = "task"; |
| 2938 | name.len = strlen(name.name); |
| 2939 | dir = d_hash_and_lookup(leader, &name); |
| 2940 | if (!dir) |
| 2941 | goto out_put_leader; |
| 2942 | |
| 2943 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2944 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2945 | dentry = d_hash_and_lookup(dir, &name); |
| 2946 | if (dentry) { |
| 2947 | shrink_dcache_parent(dentry); |
| 2948 | d_drop(dentry); |
| 2949 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2950 | } |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2951 | |
| 2952 | dput(dir); |
| 2953 | out_put_leader: |
| 2954 | dput(leader); |
| 2955 | out: |
| 2956 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | } |
| 2958 | |
Randy Dunlap | 0895e91 | 2007-10-21 21:00:10 -0700 | [diff] [blame] | 2959 | /** |
| 2960 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| 2961 | * @task: task that should be flushed. |
| 2962 | * |
| 2963 | * When flushing dentries from proc, one needs to flush them from global |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2964 | * 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] | 2965 | * in. This call is supposed to do all of this job. |
| 2966 | * |
| 2967 | * Looks in the dcache for |
| 2968 | * /proc/@pid |
| 2969 | * /proc/@tgid/task/@pid |
| 2970 | * if either directory is present flushes it and all of it'ts children |
| 2971 | * from the dcache. |
| 2972 | * |
| 2973 | * It is safe and reasonable to cache /proc entries for a task until |
| 2974 | * that task exits. After that they just clog up the dcache with |
| 2975 | * useless entries, possibly causing useful dcache entries to be |
| 2976 | * flushed instead. This routine is proved to flush those useless |
| 2977 | * dcache entries at process exit time. |
| 2978 | * |
| 2979 | * NOTE: This routine is just an optimization so it does not guarantee |
| 2980 | * that no dcache entries will exist at process exit time it |
| 2981 | * just makes it very unlikely that any will persist. |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2982 | */ |
| 2983 | |
| 2984 | void proc_flush_task(struct task_struct *task) |
| 2985 | { |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2986 | int i; |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2987 | struct pid *pid, *tgid; |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2988 | struct upid *upid; |
| 2989 | |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2990 | pid = task_pid(task); |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2991 | tgid = task_tgid(task); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2992 | |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2993 | for (i = 0; i <= pid->level; i++) { |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2994 | upid = &pid->numbers[i]; |
| 2995 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2996 | tgid->numbers[i].nr); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2997 | } |
Pavel Emelyanov | 6f4e643 | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2998 | |
| 2999 | upid = &pid->numbers[pid->level]; |
| 3000 | if (upid->nr == 1) |
| 3001 | pid_ns_release_proc(upid->ns); |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 3002 | } |
| 3003 | |
Adrian Bunk | 9711ef9 | 2006-12-06 20:38:31 -0800 | [diff] [blame] | 3004 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
| 3005 | struct dentry * dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3006 | struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3007 | { |
| 3008 | struct dentry *error = ERR_PTR(-ENOENT); |
| 3009 | struct inode *inode; |
| 3010 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3011 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3012 | if (!inode) |
| 3013 | goto out; |
| 3014 | |
| 3015 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 3016 | inode->i_op = &proc_tgid_base_inode_operations; |
| 3017 | inode->i_fop = &proc_tgid_base_operations; |
| 3018 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 3019 | |
| 3020 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, |
| 3021 | ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3022 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 3023 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3024 | |
| 3025 | d_add(dentry, inode); |
| 3026 | /* Close the race of the process dying before we return the dentry */ |
| 3027 | if (pid_revalidate(dentry, NULL)) |
| 3028 | error = NULL; |
| 3029 | out: |
| 3030 | return error; |
| 3031 | } |
| 3032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3033 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 3034 | { |
Dan Carpenter | 73d3646 | 2010-05-26 14:43:25 -0700 | [diff] [blame] | 3035 | struct dentry *result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3036 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3037 | unsigned tgid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3038 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3039 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 3040 | result = proc_base_lookup(dir, dentry); |
| 3041 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) |
| 3042 | goto out; |
| 3043 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3044 | tgid = name_to_int(dentry); |
| 3045 | if (tgid == ~0U) |
| 3046 | goto out; |
| 3047 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3048 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3049 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3050 | task = find_task_by_pid_ns(tgid, ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3051 | if (task) |
| 3052 | get_task_struct(task); |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3053 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3054 | if (!task) |
| 3055 | goto out; |
| 3056 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3057 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 3058 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3059 | out: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 3060 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3061 | } |
| 3062 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3063 | /* |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3064 | * Find the first task with tgid >= tgid |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3065 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3066 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3067 | struct tgid_iter { |
| 3068 | unsigned int tgid; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3069 | struct task_struct *task; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3070 | }; |
| 3071 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) |
| 3072 | { |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3073 | struct pid *pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3074 | |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3075 | if (iter.task) |
| 3076 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3077 | rcu_read_lock(); |
| 3078 | retry: |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3079 | iter.task = NULL; |
| 3080 | pid = find_ge_pid(iter.tgid, ns); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3081 | if (pid) { |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3082 | iter.tgid = pid_nr_ns(pid, ns); |
| 3083 | iter.task = pid_task(pid, PIDTYPE_PID); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3084 | /* What we to know is if the pid we have find is the |
| 3085 | * pid of a thread_group_leader. Testing for task |
| 3086 | * being a thread_group_leader is the obvious thing |
| 3087 | * todo but there is a window when it fails, due to |
| 3088 | * the pid transfer logic in de_thread. |
| 3089 | * |
| 3090 | * So we perform the straight forward test of seeing |
| 3091 | * if the pid we have found is the pid of a thread |
| 3092 | * group leader, and don't worry if the task we have |
| 3093 | * found doesn't happen to be a thread group leader. |
| 3094 | * As we don't care in the case of readdir. |
| 3095 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3096 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
| 3097 | iter.tgid += 1; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3098 | goto retry; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3099 | } |
| 3100 | get_task_struct(iter.task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3101 | } |
Eric W. Biederman | 454cc10 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 3102 | rcu_read_unlock(); |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3103 | return iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3104 | } |
| 3105 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 3106 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3107 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3108 | 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] | 3109 | struct tgid_iter iter) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3110 | { |
| 3111 | char name[PROC_NUMBUF]; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3112 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3113 | return proc_fill_cache(filp, dirent, filldir, name, len, |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3114 | proc_pid_instantiate, iter.task, NULL); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3115 | } |
| 3116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3117 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
| 3118 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3119 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3120 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 3121 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3122 | struct tgid_iter iter; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3123 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3124 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3125 | if (!reaper) |
| 3126 | goto out_no_task; |
| 3127 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 3128 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3129 | const struct pid_entry *p = &proc_base_stuff[nr]; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3130 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 3131 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | } |
| 3133 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3134 | ns = filp->f_dentry->d_sb->s_fs_info; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 3135 | iter.task = NULL; |
| 3136 | iter.tgid = filp->f_pos - TGID_OFFSET; |
| 3137 | for (iter = next_tgid(ns, iter); |
| 3138 | iter.task; |
| 3139 | iter.tgid += 1, iter = next_tgid(ns, iter)) { |
| 3140 | filp->f_pos = iter.tgid + TGID_OFFSET; |
| 3141 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { |
| 3142 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3143 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3145 | } |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 3146 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
| 3147 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3148 | put_task_struct(reaper); |
| 3149 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3150 | return 0; |
| 3151 | } |
| 3152 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3153 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3154 | * Tasks |
| 3155 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3156 | static const struct pid_entry tid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3157 | 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] | 3158 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3159 | REG("environ", S_IRUSR, proc_environ_operations), |
| 3160 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 3161 | ONE("status", S_IRUGO, proc_pid_status), |
| 3162 | ONE("personality", S_IRUSR, proc_pid_personality), |
Jiri Olsa | 3036e7b | 2010-09-30 15:15:33 -0700 | [diff] [blame] | 3163 | INF("limits", S_IRUGO, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3164 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3165 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 3166 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 3167 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3168 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3169 | INF("syscall", S_IRUSR, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 3170 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3171 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 3172 | ONE("stat", S_IRUGO, proc_tid_stat), |
| 3173 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 3174 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3175 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3176 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3177 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3178 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 3179 | LNK("cwd", proc_cwd_link), |
| 3180 | LNK("root", proc_root_link), |
| 3181 | LNK("exe", proc_exe_link), |
| 3182 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 3183 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 3184 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3185 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 3186 | REG("smaps", S_IRUGO, proc_smaps_operations), |
| 3187 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3188 | #endif |
| 3189 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3190 | 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] | 3191 | #endif |
| 3192 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3193 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3194 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 3195 | #ifdef CONFIG_STACKTRACE |
| 3196 | ONE("stack", S_IRUSR, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3197 | #endif |
| 3198 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3199 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3200 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3201 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3202 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 3203 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 3204 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3205 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3206 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3207 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3208 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 3209 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3210 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 3211 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
David Rientjes | a63d83f | 2010-08-09 17:19:46 -0700 | [diff] [blame] | 3212 | 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] | 3213 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3214 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 3215 | REG("sessionid", S_IRUSR, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3216 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3217 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3218 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 3219 | #endif |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3220 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 3221 | INF("io", S_IRUGO, proc_tid_io_accounting), |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 3222 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3223 | }; |
| 3224 | |
| 3225 | static int proc_tid_base_readdir(struct file * filp, |
| 3226 | void * dirent, filldir_t filldir) |
| 3227 | { |
| 3228 | return proc_pident_readdir(filp,dirent,filldir, |
| 3229 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); |
| 3230 | } |
| 3231 | |
| 3232 | 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] | 3233 | return proc_pident_lookup(dir, dentry, |
| 3234 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3235 | } |
| 3236 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3237 | static const struct file_operations proc_tid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3238 | .read = generic_read_dir, |
| 3239 | .readdir = proc_tid_base_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3240 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3241 | }; |
| 3242 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3243 | static const struct inode_operations proc_tid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3244 | .lookup = proc_tid_base_lookup, |
| 3245 | .getattr = pid_getattr, |
| 3246 | .setattr = proc_setattr, |
| 3247 | }; |
| 3248 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3249 | static struct dentry *proc_task_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3250 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3251 | { |
| 3252 | struct dentry *error = ERR_PTR(-ENOENT); |
| 3253 | struct inode *inode; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3254 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3255 | |
| 3256 | if (!inode) |
| 3257 | goto out; |
| 3258 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 3259 | inode->i_op = &proc_tid_base_inode_operations; |
| 3260 | inode->i_fop = &proc_tid_base_operations; |
| 3261 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 3262 | |
| 3263 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, |
| 3264 | ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3265 | |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 3266 | d_set_d_op(dentry, &pid_dentry_operations); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3267 | |
| 3268 | d_add(dentry, inode); |
| 3269 | /* Close the race of the process dying before we return the dentry */ |
| 3270 | if (pid_revalidate(dentry, NULL)) |
| 3271 | error = NULL; |
| 3272 | out: |
| 3273 | return error; |
| 3274 | } |
| 3275 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3276 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 3277 | { |
| 3278 | struct dentry *result = ERR_PTR(-ENOENT); |
| 3279 | struct task_struct *task; |
| 3280 | struct task_struct *leader = get_proc_task(dir); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3281 | unsigned tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3282 | struct pid_namespace *ns; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3283 | |
| 3284 | if (!leader) |
| 3285 | goto out_no_task; |
| 3286 | |
| 3287 | tid = name_to_int(dentry); |
| 3288 | if (tid == ~0U) |
| 3289 | goto out; |
| 3290 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3291 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3292 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3293 | task = find_task_by_pid_ns(tid, ns); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3294 | if (task) |
| 3295 | get_task_struct(task); |
| 3296 | rcu_read_unlock(); |
| 3297 | if (!task) |
| 3298 | goto out; |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 3299 | if (!same_thread_group(leader, task)) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3300 | goto out_drop_task; |
| 3301 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3302 | result = proc_task_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3303 | out_drop_task: |
| 3304 | put_task_struct(task); |
| 3305 | out: |
| 3306 | put_task_struct(leader); |
| 3307 | out_no_task: |
| 3308 | return result; |
| 3309 | } |
| 3310 | |
| 3311 | /* |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3312 | * Find the first tid of a thread group to return to user space. |
| 3313 | * |
| 3314 | * Usually this is just the thread group leader, but if the users |
| 3315 | * buffer was too small or there was a seek into the middle of the |
| 3316 | * directory we have more work todo. |
| 3317 | * |
| 3318 | * In the case of a short read we start with find_task_by_pid. |
| 3319 | * |
| 3320 | * In the case of a seek we start with the leader and walk nr |
| 3321 | * threads past it. |
| 3322 | */ |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3323 | static struct task_struct *first_tid(struct task_struct *leader, |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3324 | int tid, int nr, struct pid_namespace *ns) |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3325 | { |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3326 | struct task_struct *pos; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3327 | |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3328 | rcu_read_lock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3329 | /* Attempt to start with the pid of a thread */ |
| 3330 | if (tid && (nr > 0)) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3331 | pos = find_task_by_pid_ns(tid, ns); |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3332 | if (pos && (pos->group_leader == leader)) |
| 3333 | goto found; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3334 | } |
| 3335 | |
| 3336 | /* If nr exceeds the number of threads there is nothing todo */ |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3337 | pos = NULL; |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3338 | if (nr && nr >= get_nr_threads(leader)) |
| 3339 | goto out; |
| 3340 | |
| 3341 | /* If we haven't found our starting place yet start |
| 3342 | * with the leader and walk nr threads forward. |
| 3343 | */ |
| 3344 | for (pos = leader; nr > 0; --nr) { |
| 3345 | pos = next_thread(pos); |
| 3346 | if (pos == leader) { |
| 3347 | pos = NULL; |
| 3348 | goto out; |
| 3349 | } |
| 3350 | } |
| 3351 | found: |
| 3352 | get_task_struct(pos); |
| 3353 | out: |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3354 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3355 | return pos; |
| 3356 | } |
| 3357 | |
| 3358 | /* |
| 3359 | * Find the next thread in the thread list. |
| 3360 | * Return NULL if there is an error or no next thread. |
| 3361 | * |
| 3362 | * The reference to the input task_struct is released. |
| 3363 | */ |
| 3364 | static struct task_struct *next_tid(struct task_struct *start) |
| 3365 | { |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3366 | struct task_struct *pos = NULL; |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3367 | rcu_read_lock(); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3368 | if (pid_alive(start)) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3369 | pos = next_thread(start); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3370 | if (thread_group_leader(pos)) |
| 3371 | pos = NULL; |
| 3372 | else |
| 3373 | get_task_struct(pos); |
| 3374 | } |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3375 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3376 | put_task_struct(start); |
| 3377 | return pos; |
| 3378 | } |
| 3379 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3380 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 3381 | struct task_struct *task, int tid) |
| 3382 | { |
| 3383 | char name[PROC_NUMBUF]; |
| 3384 | int len = snprintf(name, sizeof(name), "%d", tid); |
| 3385 | return proc_fill_cache(filp, dirent, filldir, name, len, |
| 3386 | proc_task_instantiate, task, NULL); |
| 3387 | } |
| 3388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3389 | /* for the /proc/TGID/task/ directories */ |
| 3390 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3391 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 3392 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3393 | struct inode *inode = dentry->d_inode; |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3394 | struct task_struct *leader = NULL; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3395 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3396 | int retval = -ENOENT; |
| 3397 | ino_t ino; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3398 | int tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3399 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3400 | |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3401 | task = get_proc_task(inode); |
| 3402 | if (!task) |
| 3403 | goto out_no_task; |
| 3404 | rcu_read_lock(); |
| 3405 | if (pid_alive(task)) { |
| 3406 | leader = task->group_leader; |
| 3407 | get_task_struct(leader); |
| 3408 | } |
| 3409 | rcu_read_unlock(); |
| 3410 | put_task_struct(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3411 | if (!leader) |
| 3412 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3413 | retval = 0; |
| 3414 | |
Linus Torvalds | ee568b2 | 2009-03-17 10:02:35 -0700 | [diff] [blame] | 3415 | switch ((unsigned long)filp->f_pos) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3416 | case 0: |
| 3417 | ino = inode->i_ino; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3418 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3419 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3420 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3421 | /* fall through */ |
| 3422 | case 1: |
| 3423 | ino = parent_ino(dentry); |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3424 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3425 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3426 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3427 | /* fall through */ |
| 3428 | } |
| 3429 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3430 | /* f_version caches the tgid value that the last readdir call couldn't |
| 3431 | * return. lseek aka telldir automagically resets f_version to 0. |
| 3432 | */ |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3433 | ns = filp->f_dentry->d_sb->s_fs_info; |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3434 | tid = (int)filp->f_version; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3435 | filp->f_version = 0; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3436 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3437 | task; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3438 | task = next_tid(task), filp->f_pos++) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3439 | tid = task_pid_nr_ns(task, ns); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3440 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3441 | /* returning this tgid failed, save it as the first |
| 3442 | * pid for the next readir call */ |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3443 | filp->f_version = (u64)tid; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3444 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3445 | break; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3446 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3447 | } |
| 3448 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3449 | put_task_struct(leader); |
| 3450 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3451 | return retval; |
| 3452 | } |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3453 | |
| 3454 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 3455 | { |
| 3456 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3457 | struct task_struct *p = get_proc_task(inode); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3458 | generic_fillattr(inode, stat); |
| 3459 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3460 | if (p) { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3461 | stat->nlink += get_nr_threads(p); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3462 | put_task_struct(p); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3463 | } |
| 3464 | |
| 3465 | return 0; |
| 3466 | } |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3467 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3468 | static const struct inode_operations proc_task_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3469 | .lookup = proc_task_lookup, |
| 3470 | .getattr = proc_task_getattr, |
| 3471 | .setattr = proc_setattr, |
| 3472 | }; |
| 3473 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3474 | static const struct file_operations proc_task_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3475 | .read = generic_read_dir, |
| 3476 | .readdir = proc_task_readdir, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 3477 | .llseek = default_llseek, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3478 | }; |