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> |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 66 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <linux/kallsyms.h> |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 68 | #include <linux/stacktrace.h> |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 69 | #include <linux/resource.h> |
Kees Cook | 5096add | 2007-05-08 00:26:04 -0700 | [diff] [blame] | 70 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #include <linux/mount.h> |
| 72 | #include <linux/security.h> |
| 73 | #include <linux/ptrace.h> |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 74 | #include <linux/tracehook.h> |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 75 | #include <linux/cgroup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <linux/cpuset.h> |
| 77 | #include <linux/audit.h> |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 78 | #include <linux/poll.h> |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 79 | #include <linux/nsproxy.h> |
Alexey Dobriyan | 8ac773b | 2006-10-19 23:28:32 -0700 | [diff] [blame] | 80 | #include <linux/oom.h> |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 81 | #include <linux/elf.h> |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 82 | #include <linux/pid_namespace.h> |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 83 | #include <linux/fs_struct.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include "internal.h" |
| 85 | |
Eric W. Biederman | 0f2fe20 | 2006-06-26 00:25:46 -0700 | [diff] [blame] | 86 | /* NOTE: |
| 87 | * Implementing inode permission operations in /proc is almost |
| 88 | * certainly an error. Permission checks need to happen during |
| 89 | * each system call not at open time. The reason is that most of |
| 90 | * what we wish to check for permissions in /proc varies at runtime. |
| 91 | * |
| 92 | * The classic example of a problem is opening file descriptors |
| 93 | * in /proc for a task before it execs a suid executable. |
| 94 | */ |
| 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | struct pid_entry { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | char *name; |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 98 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | mode_t mode; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 100 | const struct inode_operations *iop; |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 101 | const struct file_operations *fop; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 102 | union proc_op op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | }; |
| 104 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 105 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 106 | .name = (NAME), \ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 107 | .len = sizeof(NAME) - 1, \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 108 | .mode = MODE, \ |
| 109 | .iop = IOP, \ |
| 110 | .fop = FOP, \ |
| 111 | .op = OP, \ |
| 112 | } |
| 113 | |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 114 | #define DIR(NAME, MODE, iops, fops) \ |
| 115 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) |
| 116 | #define LNK(NAME, get_link) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 117 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 118 | &proc_pid_link_inode_operations, NULL, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 119 | { .proc_get_link = get_link } ) |
| 120 | #define REG(NAME, MODE, fops) \ |
| 121 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) |
| 122 | #define INF(NAME, MODE, read) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 123 | NOD(NAME, (S_IFREG|(MODE)), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 124 | NULL, &proc_info_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 125 | { .proc_read = read } ) |
| 126 | #define ONE(NAME, MODE, show) \ |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 127 | NOD(NAME, (S_IFREG|(MODE)), \ |
| 128 | NULL, &proc_single_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 129 | { .proc_show = show } ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 131 | /* |
| 132 | * Count the number of hardlinks for the pid_entry table, excluding the . |
| 133 | * and .. links. |
| 134 | */ |
| 135 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, |
| 136 | unsigned int n) |
| 137 | { |
| 138 | unsigned int i; |
| 139 | unsigned int count; |
| 140 | |
| 141 | count = 0; |
| 142 | for (i = 0; i < n; ++i) { |
| 143 | if (S_ISDIR(entries[i].mode)) |
| 144 | ++count; |
| 145 | } |
| 146 | |
| 147 | return count; |
| 148 | } |
| 149 | |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 150 | static int get_fs_path(struct task_struct *task, struct path *path, bool root) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | { |
| 152 | struct fs_struct *fs; |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 153 | int result = -ENOENT; |
| 154 | |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 155 | task_lock(task); |
| 156 | fs = task->fs; |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 157 | if (fs) { |
| 158 | read_lock(&fs->lock); |
| 159 | *path = root ? fs->root : fs->pwd; |
| 160 | path_get(path); |
| 161 | read_unlock(&fs->lock); |
| 162 | result = 0; |
| 163 | } |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 164 | task_unlock(task); |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 165 | return result; |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 168 | static int get_nr_threads(struct task_struct *tsk) |
| 169 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 170 | unsigned long flags; |
| 171 | int count = 0; |
| 172 | |
| 173 | if (lock_task_sighand(tsk, &flags)) { |
| 174 | count = atomic_read(&tsk->signal->count); |
| 175 | unlock_task_sighand(tsk, &flags); |
| 176 | } |
| 177 | return count; |
| 178 | } |
| 179 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 180 | static int proc_cwd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 181 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 182 | struct task_struct *task = get_proc_task(inode); |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 183 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 184 | |
| 185 | if (task) { |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 186 | result = get_fs_path(task, path, 0); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 187 | put_task_struct(task); |
| 188 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | return result; |
| 190 | } |
| 191 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 192 | static int proc_root_link(struct inode *inode, struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 194 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 196 | |
| 197 | if (task) { |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 198 | result = get_fs_path(task, path, 1); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 199 | put_task_struct(task); |
| 200 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | return result; |
| 202 | } |
| 203 | |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 204 | /* |
| 205 | * Return zero if current may access user memory in @task, -error if not. |
| 206 | */ |
| 207 | static int check_mem_permission(struct task_struct *task) |
| 208 | { |
| 209 | /* |
| 210 | * A task can always look at itself, in case it chooses |
| 211 | * to use system calls instead of load instructions. |
| 212 | */ |
| 213 | if (task == current) |
| 214 | return 0; |
| 215 | |
| 216 | /* |
| 217 | * If current is actively ptrace'ing, and would also be |
| 218 | * permitted to freshly attach with ptrace now, permit it. |
| 219 | */ |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 220 | if (task_is_stopped_or_traced(task)) { |
| 221 | int match; |
| 222 | rcu_read_lock(); |
| 223 | match = (tracehook_tracer_task(task) == current); |
| 224 | rcu_read_unlock(); |
| 225 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) |
| 226 | return 0; |
| 227 | } |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 228 | |
| 229 | /* |
| 230 | * Noone else is allowed. |
| 231 | */ |
| 232 | return -EPERM; |
| 233 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 235 | struct mm_struct *mm_for_maps(struct task_struct *task) |
| 236 | { |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 237 | struct mm_struct *mm; |
Oleg Nesterov | 00f89d2 | 2009-07-10 03:27:38 +0200 | [diff] [blame] | 238 | |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 239 | if (mutex_lock_killable(&task->cred_guard_mutex)) |
| 240 | return NULL; |
| 241 | |
| 242 | mm = get_task_mm(task); |
| 243 | if (mm && mm != current->mm && |
| 244 | !ptrace_may_access(task, PTRACE_MODE_READ)) { |
| 245 | mmput(mm); |
| 246 | mm = NULL; |
Oleg Nesterov | 13f0fea | 2009-06-23 21:25:32 +0200 | [diff] [blame] | 247 | } |
Oleg Nesterov | 704b836 | 2009-07-10 03:27:40 +0200 | [diff] [blame] | 248 | mutex_unlock(&task->cred_guard_mutex); |
| 249 | |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 250 | return mm; |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 251 | } |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
| 254 | { |
| 255 | int res = 0; |
| 256 | unsigned int len; |
| 257 | struct mm_struct *mm = get_task_mm(task); |
| 258 | if (!mm) |
| 259 | goto out; |
| 260 | if (!mm->arg_end) |
| 261 | goto out_mm; /* Shh! No looking before we're done */ |
| 262 | |
| 263 | len = mm->arg_end - mm->arg_start; |
| 264 | |
| 265 | if (len > PAGE_SIZE) |
| 266 | len = PAGE_SIZE; |
| 267 | |
| 268 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); |
| 269 | |
| 270 | // If the nul at the end of args has been overwritten, then |
| 271 | // assume application is using setproctitle(3). |
| 272 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { |
| 273 | len = strnlen(buffer, res); |
| 274 | if (len < res) { |
| 275 | res = len; |
| 276 | } else { |
| 277 | len = mm->env_end - mm->env_start; |
| 278 | if (len > PAGE_SIZE - res) |
| 279 | len = PAGE_SIZE - res; |
| 280 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); |
| 281 | res = strnlen(buffer, res); |
| 282 | } |
| 283 | } |
| 284 | out_mm: |
| 285 | mmput(mm); |
| 286 | out: |
| 287 | return res; |
| 288 | } |
| 289 | |
| 290 | static int proc_pid_auxv(struct task_struct *task, char *buffer) |
| 291 | { |
| 292 | int res = 0; |
| 293 | struct mm_struct *mm = get_task_mm(task); |
| 294 | if (mm) { |
| 295 | unsigned int nwords = 0; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 296 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | nwords += 2; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 298 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | res = nwords * sizeof(mm->saved_auxv[0]); |
| 300 | if (res > PAGE_SIZE) |
| 301 | res = PAGE_SIZE; |
| 302 | memcpy(buffer, mm->saved_auxv, res); |
| 303 | mmput(mm); |
| 304 | } |
| 305 | return res; |
| 306 | } |
| 307 | |
| 308 | |
| 309 | #ifdef CONFIG_KALLSYMS |
| 310 | /* |
| 311 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. |
| 312 | * Returns the resolved symbol. If that fails, simply return the address. |
| 313 | */ |
| 314 | static int proc_pid_wchan(struct task_struct *task, char *buffer) |
| 315 | { |
Alexey Dobriyan | ffb4512 | 2007-05-08 00:28:41 -0700 | [diff] [blame] | 316 | unsigned long wchan; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 317 | char symname[KSYM_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
| 319 | wchan = get_wchan(task); |
| 320 | |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 321 | if (lookup_symbol_name(wchan, symname) < 0) |
Jake Edge | f83ce3e | 2009-05-04 12:51:14 -0600 | [diff] [blame] | 322 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
| 323 | return 0; |
| 324 | else |
| 325 | return sprintf(buffer, "%lu", wchan); |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 326 | else |
| 327 | return sprintf(buffer, "%s", symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | } |
| 329 | #endif /* CONFIG_KALLSYMS */ |
| 330 | |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 331 | #ifdef CONFIG_STACKTRACE |
| 332 | |
| 333 | #define MAX_STACK_TRACE_DEPTH 64 |
| 334 | |
| 335 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, |
| 336 | struct pid *pid, struct task_struct *task) |
| 337 | { |
| 338 | struct stack_trace trace; |
| 339 | unsigned long *entries; |
| 340 | int i; |
| 341 | |
| 342 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); |
| 343 | if (!entries) |
| 344 | return -ENOMEM; |
| 345 | |
| 346 | trace.nr_entries = 0; |
| 347 | trace.max_entries = MAX_STACK_TRACE_DEPTH; |
| 348 | trace.entries = entries; |
| 349 | trace.skip = 0; |
| 350 | save_stack_trace_tsk(task, &trace); |
| 351 | |
| 352 | for (i = 0; i < trace.nr_entries; i++) { |
| 353 | seq_printf(m, "[<%p>] %pS\n", |
| 354 | (void *)entries[i], (void *)entries[i]); |
| 355 | } |
| 356 | kfree(entries); |
| 357 | |
| 358 | return 0; |
| 359 | } |
| 360 | #endif |
| 361 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | #ifdef CONFIG_SCHEDSTATS |
| 363 | /* |
| 364 | * Provides /proc/PID/schedstat |
| 365 | */ |
| 366 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) |
| 367 | { |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 368 | return sprintf(buffer, "%llu %llu %lu\n", |
Ingo Molnar | 826e08b | 2008-12-22 07:37:41 +0100 | [diff] [blame] | 369 | (unsigned long long)task->se.sum_exec_runtime, |
| 370 | (unsigned long long)task->sched_info.run_delay, |
Ingo Molnar | 2d72376 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 371 | task->sched_info.pcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | } |
| 373 | #endif |
| 374 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 375 | #ifdef CONFIG_LATENCYTOP |
| 376 | static int lstats_show_proc(struct seq_file *m, void *v) |
| 377 | { |
| 378 | int i; |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 379 | struct inode *inode = m->private; |
| 380 | struct task_struct *task = get_proc_task(inode); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 381 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 382 | if (!task) |
| 383 | return -ESRCH; |
| 384 | seq_puts(m, "Latency Top version : v0.1\n"); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 385 | for (i = 0; i < 32; i++) { |
| 386 | if (task->latency_record[i].backtrace[0]) { |
| 387 | int q; |
| 388 | seq_printf(m, "%i %li %li ", |
| 389 | task->latency_record[i].count, |
| 390 | task->latency_record[i].time, |
| 391 | task->latency_record[i].max); |
| 392 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
Hugh Dickins | 9c24624 | 2008-12-09 13:14:27 -0800 | [diff] [blame] | 393 | char sym[KSYM_SYMBOL_LEN]; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 394 | char *c; |
| 395 | if (!task->latency_record[i].backtrace[q]) |
| 396 | break; |
| 397 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) |
| 398 | break; |
| 399 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); |
| 400 | c = strchr(sym, '+'); |
| 401 | if (c) |
| 402 | *c = 0; |
| 403 | seq_printf(m, "%s ", sym); |
| 404 | } |
| 405 | seq_printf(m, "\n"); |
| 406 | } |
| 407 | |
| 408 | } |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 409 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | static int lstats_open(struct inode *inode, struct file *file) |
| 414 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 415 | return single_open(file, lstats_show_proc, inode); |
Hiroshi Shimamoto | d6643d1 | 2008-02-14 10:27:00 -0800 | [diff] [blame] | 416 | } |
| 417 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 418 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
| 419 | size_t count, loff_t *offs) |
| 420 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 421 | 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] | 422 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 423 | if (!task) |
| 424 | return -ESRCH; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 425 | clear_all_latency_tracing(task); |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 426 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 427 | |
| 428 | return count; |
| 429 | } |
| 430 | |
| 431 | static const struct file_operations proc_lstats_operations = { |
| 432 | .open = lstats_open, |
| 433 | .read = seq_read, |
| 434 | .write = lstats_write, |
| 435 | .llseek = seq_lseek, |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 436 | .release = single_release, |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 437 | }; |
| 438 | |
| 439 | #endif |
| 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | /* The badness from the OOM killer */ |
| 442 | unsigned long badness(struct task_struct *p, unsigned long uptime); |
| 443 | static int proc_oom_score(struct task_struct *task, char *buffer) |
| 444 | { |
| 445 | unsigned long points; |
| 446 | struct timespec uptime; |
| 447 | |
| 448 | do_posix_clock_monotonic_gettime(&uptime); |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 449 | read_lock(&tasklist_lock); |
KOSAKI Motohiro | 495789a | 2009-09-21 17:03:14 -0700 | [diff] [blame] | 450 | points = badness(task->group_leader, uptime.tv_sec); |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 451 | read_unlock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | return sprintf(buffer, "%lu\n", points); |
| 453 | } |
| 454 | |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 455 | struct limit_names { |
| 456 | char *name; |
| 457 | char *unit; |
| 458 | }; |
| 459 | |
| 460 | static const struct limit_names lnames[RLIM_NLIMITS] = { |
Kees Cook | cff4edb | 2009-09-22 16:45:32 -0700 | [diff] [blame] | 461 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 462 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
| 463 | [RLIMIT_DATA] = {"Max data size", "bytes"}, |
| 464 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, |
| 465 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, |
| 466 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, |
| 467 | [RLIMIT_NPROC] = {"Max processes", "processes"}, |
| 468 | [RLIMIT_NOFILE] = {"Max open files", "files"}, |
| 469 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, |
| 470 | [RLIMIT_AS] = {"Max address space", "bytes"}, |
| 471 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, |
| 472 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, |
| 473 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, |
| 474 | [RLIMIT_NICE] = {"Max nice priority", NULL}, |
| 475 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, |
Eugene Teo | 8808117 | 2008-02-23 15:23:52 -0800 | [diff] [blame] | 476 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 477 | }; |
| 478 | |
| 479 | /* Display limits for a process */ |
| 480 | static int proc_pid_limits(struct task_struct *task, char *buffer) |
| 481 | { |
| 482 | unsigned int i; |
| 483 | int count = 0; |
| 484 | unsigned long flags; |
| 485 | char *bufptr = buffer; |
| 486 | |
| 487 | struct rlimit rlim[RLIM_NLIMITS]; |
| 488 | |
Lai Jiangshan | a6bebbc | 2008-10-05 00:51:15 +0400 | [diff] [blame] | 489 | if (!lock_task_sighand(task, &flags)) |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 490 | return 0; |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 491 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
| 492 | unlock_task_sighand(task, &flags); |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 493 | |
| 494 | /* |
| 495 | * print the file header |
| 496 | */ |
| 497 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", |
| 498 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
| 499 | |
| 500 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 501 | if (rlim[i].rlim_cur == RLIM_INFINITY) |
| 502 | count += sprintf(&bufptr[count], "%-25s %-20s ", |
| 503 | lnames[i].name, "unlimited"); |
| 504 | else |
| 505 | count += sprintf(&bufptr[count], "%-25s %-20lu ", |
| 506 | lnames[i].name, rlim[i].rlim_cur); |
| 507 | |
| 508 | if (rlim[i].rlim_max == RLIM_INFINITY) |
| 509 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); |
| 510 | else |
| 511 | count += sprintf(&bufptr[count], "%-20lu ", |
| 512 | rlim[i].rlim_max); |
| 513 | |
| 514 | if (lnames[i].unit) |
| 515 | count += sprintf(&bufptr[count], "%-10s\n", |
| 516 | lnames[i].unit); |
| 517 | else |
| 518 | count += sprintf(&bufptr[count], "\n"); |
| 519 | } |
| 520 | |
| 521 | return count; |
| 522 | } |
| 523 | |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 524 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
| 525 | static int proc_pid_syscall(struct task_struct *task, char *buffer) |
| 526 | { |
| 527 | long nr; |
| 528 | unsigned long args[6], sp, pc; |
| 529 | |
| 530 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) |
| 531 | return sprintf(buffer, "running\n"); |
| 532 | |
| 533 | if (nr < 0) |
| 534 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
| 535 | |
| 536 | return sprintf(buffer, |
| 537 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
| 538 | nr, |
| 539 | args[0], args[1], args[2], args[3], args[4], args[5], |
| 540 | sp, pc); |
| 541 | } |
| 542 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | /************************************************************************/ |
| 545 | /* Here the fs part begins */ |
| 546 | /************************************************************************/ |
| 547 | |
| 548 | /* permission checks */ |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 549 | static int proc_fd_access_allowed(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | { |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 551 | struct task_struct *task; |
| 552 | int allowed = 0; |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 553 | /* Allow access to a task's file descriptors if it is us or we |
| 554 | * may use ptrace attach to the process and find out that |
| 555 | * information. |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 556 | */ |
| 557 | task = get_proc_task(inode); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 558 | if (task) { |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 559 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 560 | put_task_struct(task); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 561 | } |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 562 | return allowed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 565 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
| 566 | { |
| 567 | int error; |
| 568 | struct inode *inode = dentry->d_inode; |
| 569 | |
| 570 | if (attr->ia_valid & ATTR_MODE) |
| 571 | return -EPERM; |
| 572 | |
| 573 | error = inode_change_ok(inode, attr); |
John Johansen | 1e8123f | 2007-05-08 00:29:41 -0700 | [diff] [blame] | 574 | if (!error) |
| 575 | error = inode_setattr(inode, attr); |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 576 | return error; |
| 577 | } |
| 578 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 579 | static const struct inode_operations proc_def_inode_operations = { |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 580 | .setattr = proc_setattr, |
| 581 | }; |
| 582 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 583 | static int mounts_open_common(struct inode *inode, struct file *file, |
| 584 | const struct seq_operations *op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 586 | struct task_struct *task = get_proc_task(inode); |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 587 | struct nsproxy *nsp; |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 588 | struct mnt_namespace *ns = NULL; |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 589 | struct path root; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 590 | struct proc_mounts *p; |
| 591 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 593 | if (task) { |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 594 | rcu_read_lock(); |
| 595 | nsp = task_nsproxy(task); |
| 596 | if (nsp) { |
| 597 | ns = nsp->mnt_ns; |
Alexey Dobriyan | 863c470 | 2007-01-26 00:56:53 -0800 | [diff] [blame] | 598 | if (ns) |
| 599 | get_mnt_ns(ns); |
| 600 | } |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 601 | rcu_read_unlock(); |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 602 | if (ns && get_fs_path(task, &root, 1) == 0) |
| 603 | ret = 0; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 604 | put_task_struct(task); |
| 605 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 607 | if (!ns) |
| 608 | goto err; |
Hugh Dickins | 7c2c7d9 | 2009-03-28 23:21:27 +0000 | [diff] [blame] | 609 | if (ret) |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 610 | goto err_put_ns; |
| 611 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 612 | ret = -ENOMEM; |
| 613 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); |
| 614 | if (!p) |
| 615 | goto err_put_path; |
| 616 | |
| 617 | file->private_data = &p->m; |
| 618 | ret = seq_open(file, op); |
| 619 | if (ret) |
| 620 | goto err_free; |
| 621 | |
| 622 | p->m.private = p; |
| 623 | p->ns = ns; |
| 624 | p->root = root; |
| 625 | p->event = ns->event; |
| 626 | |
| 627 | return 0; |
| 628 | |
| 629 | err_free: |
| 630 | kfree(p); |
| 631 | err_put_path: |
| 632 | path_put(&root); |
| 633 | err_put_ns: |
| 634 | put_mnt_ns(ns); |
| 635 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | return ret; |
| 637 | } |
| 638 | |
| 639 | static int mounts_release(struct inode *inode, struct file *file) |
| 640 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 641 | struct proc_mounts *p = file->private_data; |
| 642 | path_put(&p->root); |
| 643 | put_mnt_ns(p->ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | return seq_release(inode, file); |
| 645 | } |
| 646 | |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 647 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
| 648 | { |
| 649 | struct proc_mounts *p = file->private_data; |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 650 | struct mnt_namespace *ns = p->ns; |
KOSAKI Motohiro | 31b0709 | 2009-04-09 13:57:59 +0900 | [diff] [blame] | 651 | unsigned res = POLLIN | POLLRDNORM; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 652 | |
| 653 | poll_wait(file, &ns->poll, wait); |
| 654 | |
| 655 | spin_lock(&vfsmount_lock); |
| 656 | if (p->event != ns->event) { |
| 657 | p->event = ns->event; |
KOSAKI Motohiro | 31b0709 | 2009-04-09 13:57:59 +0900 | [diff] [blame] | 658 | res |= POLLERR | POLLPRI; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 659 | } |
| 660 | spin_unlock(&vfsmount_lock); |
| 661 | |
| 662 | return res; |
| 663 | } |
| 664 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 665 | static int mounts_open(struct inode *inode, struct file *file) |
| 666 | { |
| 667 | return mounts_open_common(inode, file, &mounts_op); |
| 668 | } |
| 669 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 670 | static const struct file_operations proc_mounts_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | .open = mounts_open, |
| 672 | .read = seq_read, |
| 673 | .llseek = seq_lseek, |
| 674 | .release = mounts_release, |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 675 | .poll = mounts_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | }; |
| 677 | |
Ram Pai | 2d4d486 | 2008-03-27 13:06:25 +0100 | [diff] [blame] | 678 | static int mountinfo_open(struct inode *inode, struct file *file) |
| 679 | { |
| 680 | return mounts_open_common(inode, file, &mountinfo_op); |
| 681 | } |
| 682 | |
| 683 | static const struct file_operations proc_mountinfo_operations = { |
| 684 | .open = mountinfo_open, |
| 685 | .read = seq_read, |
| 686 | .llseek = seq_lseek, |
| 687 | .release = mounts_release, |
| 688 | .poll = mounts_poll, |
| 689 | }; |
| 690 | |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 691 | static int mountstats_open(struct inode *inode, struct file *file) |
| 692 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 693 | return mounts_open_common(inode, file, &mountstats_op); |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 694 | } |
| 695 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 696 | static const struct file_operations proc_mountstats_operations = { |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 697 | .open = mountstats_open, |
| 698 | .read = seq_read, |
| 699 | .llseek = seq_lseek, |
| 700 | .release = mounts_release, |
| 701 | }; |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
| 704 | |
| 705 | static ssize_t proc_info_read(struct file * file, char __user * buf, |
| 706 | size_t count, loff_t *ppos) |
| 707 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 708 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | unsigned long page; |
| 710 | ssize_t length; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 711 | struct task_struct *task = get_proc_task(inode); |
| 712 | |
| 713 | length = -ESRCH; |
| 714 | if (!task) |
| 715 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
| 717 | if (count > PROC_BLOCK_SIZE) |
| 718 | count = PROC_BLOCK_SIZE; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 719 | |
| 720 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 721 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 722 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | length = PROC_I(inode)->op.proc_read(task, (char*)page); |
| 725 | |
| 726 | if (length >= 0) |
| 727 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); |
| 728 | free_page(page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 729 | out: |
| 730 | put_task_struct(task); |
| 731 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | return length; |
| 733 | } |
| 734 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 735 | static const struct file_operations proc_info_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | .read = proc_info_read, |
| 737 | }; |
| 738 | |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 739 | static int proc_single_show(struct seq_file *m, void *v) |
| 740 | { |
| 741 | struct inode *inode = m->private; |
| 742 | struct pid_namespace *ns; |
| 743 | struct pid *pid; |
| 744 | struct task_struct *task; |
| 745 | int ret; |
| 746 | |
| 747 | ns = inode->i_sb->s_fs_info; |
| 748 | pid = proc_pid(inode); |
| 749 | task = get_pid_task(pid, PIDTYPE_PID); |
| 750 | if (!task) |
| 751 | return -ESRCH; |
| 752 | |
| 753 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); |
| 754 | |
| 755 | put_task_struct(task); |
| 756 | return ret; |
| 757 | } |
| 758 | |
| 759 | static int proc_single_open(struct inode *inode, struct file *filp) |
| 760 | { |
| 761 | int ret; |
| 762 | ret = single_open(filp, proc_single_show, NULL); |
| 763 | if (!ret) { |
| 764 | struct seq_file *m = filp->private_data; |
| 765 | |
| 766 | m->private = inode; |
| 767 | } |
| 768 | return ret; |
| 769 | } |
| 770 | |
| 771 | static const struct file_operations proc_single_file_operations = { |
| 772 | .open = proc_single_open, |
| 773 | .read = seq_read, |
| 774 | .llseek = seq_lseek, |
| 775 | .release = single_release, |
| 776 | }; |
| 777 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | static int mem_open(struct inode* inode, struct file* file) |
| 779 | { |
| 780 | file->private_data = (void*)((long)current->self_exec_id); |
| 781 | return 0; |
| 782 | } |
| 783 | |
| 784 | static ssize_t mem_read(struct file * file, char __user * buf, |
| 785 | size_t count, loff_t *ppos) |
| 786 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 787 | 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] | 788 | char *page; |
| 789 | unsigned long src = *ppos; |
| 790 | int ret = -ESRCH; |
| 791 | struct mm_struct *mm; |
| 792 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 793 | if (!task) |
| 794 | goto out_no_task; |
| 795 | |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 796 | if (check_mem_permission(task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | goto out; |
| 798 | |
| 799 | ret = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 800 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | if (!page) |
| 802 | goto out; |
| 803 | |
| 804 | ret = 0; |
| 805 | |
| 806 | mm = get_task_mm(task); |
| 807 | if (!mm) |
| 808 | goto out_free; |
| 809 | |
| 810 | ret = -EIO; |
| 811 | |
| 812 | if (file->private_data != (void*)((long)current->self_exec_id)) |
| 813 | goto out_put; |
| 814 | |
| 815 | ret = 0; |
| 816 | |
| 817 | while (count > 0) { |
| 818 | int this_len, retval; |
| 819 | |
| 820 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 821 | retval = access_process_vm(task, src, page, this_len, 0); |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 822 | if (!retval || check_mem_permission(task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | if (!ret) |
| 824 | ret = -EIO; |
| 825 | break; |
| 826 | } |
| 827 | |
| 828 | if (copy_to_user(buf, page, retval)) { |
| 829 | ret = -EFAULT; |
| 830 | break; |
| 831 | } |
| 832 | |
| 833 | ret += retval; |
| 834 | src += retval; |
| 835 | buf += retval; |
| 836 | count -= retval; |
| 837 | } |
| 838 | *ppos = src; |
| 839 | |
| 840 | out_put: |
| 841 | mmput(mm); |
| 842 | out_free: |
| 843 | free_page((unsigned long) page); |
| 844 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 845 | put_task_struct(task); |
| 846 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | return ret; |
| 848 | } |
| 849 | |
| 850 | #define mem_write NULL |
| 851 | |
| 852 | #ifndef mem_write |
| 853 | /* This is a security hazard */ |
Glauber de Oliveira Costa | 63967fa | 2007-02-20 13:58:12 -0800 | [diff] [blame] | 854 | static ssize_t mem_write(struct file * file, const char __user *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | size_t count, loff_t *ppos) |
| 856 | { |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 857 | int copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | char *page; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 859 | 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] | 860 | unsigned long dst = *ppos; |
| 861 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 862 | copied = -ESRCH; |
| 863 | if (!task) |
| 864 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 866 | if (check_mem_permission(task)) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 867 | goto out; |
| 868 | |
| 869 | copied = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 870 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | if (!page) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 872 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 874 | copied = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | while (count > 0) { |
| 876 | int this_len, retval; |
| 877 | |
| 878 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 879 | if (copy_from_user(page, buf, this_len)) { |
| 880 | copied = -EFAULT; |
| 881 | break; |
| 882 | } |
| 883 | retval = access_process_vm(task, dst, page, this_len, 1); |
| 884 | if (!retval) { |
| 885 | if (!copied) |
| 886 | copied = -EIO; |
| 887 | break; |
| 888 | } |
| 889 | copied += retval; |
| 890 | buf += retval; |
| 891 | dst += retval; |
| 892 | count -= retval; |
| 893 | } |
| 894 | *ppos = dst; |
| 895 | free_page((unsigned long) page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 896 | out: |
| 897 | put_task_struct(task); |
| 898 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | return copied; |
| 900 | } |
| 901 | #endif |
| 902 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 903 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | { |
| 905 | switch (orig) { |
| 906 | case 0: |
| 907 | file->f_pos = offset; |
| 908 | break; |
| 909 | case 1: |
| 910 | file->f_pos += offset; |
| 911 | break; |
| 912 | default: |
| 913 | return -EINVAL; |
| 914 | } |
| 915 | force_successful_syscall_return(); |
| 916 | return file->f_pos; |
| 917 | } |
| 918 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 919 | static const struct file_operations proc_mem_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | .llseek = mem_lseek, |
| 921 | .read = mem_read, |
| 922 | .write = mem_write, |
| 923 | .open = mem_open, |
| 924 | }; |
| 925 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 926 | static ssize_t environ_read(struct file *file, char __user *buf, |
| 927 | size_t count, loff_t *ppos) |
| 928 | { |
| 929 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 930 | char *page; |
| 931 | unsigned long src = *ppos; |
| 932 | int ret = -ESRCH; |
| 933 | struct mm_struct *mm; |
| 934 | |
| 935 | if (!task) |
| 936 | goto out_no_task; |
| 937 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 938 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 939 | goto out; |
| 940 | |
| 941 | ret = -ENOMEM; |
| 942 | page = (char *)__get_free_page(GFP_TEMPORARY); |
| 943 | if (!page) |
| 944 | goto out; |
| 945 | |
| 946 | ret = 0; |
| 947 | |
| 948 | mm = get_task_mm(task); |
| 949 | if (!mm) |
| 950 | goto out_free; |
| 951 | |
| 952 | while (count > 0) { |
| 953 | int this_len, retval, max_len; |
| 954 | |
| 955 | this_len = mm->env_end - (mm->env_start + src); |
| 956 | |
| 957 | if (this_len <= 0) |
| 958 | break; |
| 959 | |
| 960 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 961 | this_len = (this_len > max_len) ? max_len : this_len; |
| 962 | |
| 963 | retval = access_process_vm(task, (mm->env_start + src), |
| 964 | page, this_len, 0); |
| 965 | |
| 966 | if (retval <= 0) { |
| 967 | ret = retval; |
| 968 | break; |
| 969 | } |
| 970 | |
| 971 | if (copy_to_user(buf, page, retval)) { |
| 972 | ret = -EFAULT; |
| 973 | break; |
| 974 | } |
| 975 | |
| 976 | ret += retval; |
| 977 | src += retval; |
| 978 | buf += retval; |
| 979 | count -= retval; |
| 980 | } |
| 981 | *ppos = src; |
| 982 | |
| 983 | mmput(mm); |
| 984 | out_free: |
| 985 | free_page((unsigned long) page); |
| 986 | out: |
| 987 | put_task_struct(task); |
| 988 | out_no_task: |
| 989 | return ret; |
| 990 | } |
| 991 | |
| 992 | static const struct file_operations proc_environ_operations = { |
| 993 | .read = environ_read, |
| 994 | }; |
| 995 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
| 997 | size_t count, loff_t *ppos) |
| 998 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 999 | 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] | 1000 | char buffer[PROC_NUMBUF]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | size_t len; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1002 | int oom_adjust = OOM_DISABLE; |
| 1003 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1005 | if (!task) |
| 1006 | return -ESRCH; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1007 | |
| 1008 | if (lock_task_sighand(task, &flags)) { |
| 1009 | oom_adjust = task->signal->oom_adj; |
| 1010 | unlock_task_sighand(task, &flags); |
| 1011 | } |
| 1012 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1013 | put_task_struct(task); |
| 1014 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1015 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1016 | |
| 1017 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | } |
| 1019 | |
| 1020 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, |
| 1021 | size_t count, loff_t *ppos) |
| 1022 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1023 | struct task_struct *task; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1024 | char buffer[PROC_NUMBUF]; |
| 1025 | long oom_adjust; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1026 | unsigned long flags; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1027 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1029 | memset(buffer, 0, sizeof(buffer)); |
| 1030 | if (count > sizeof(buffer) - 1) |
| 1031 | count = sizeof(buffer) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | if (copy_from_user(buffer, buf, count)) |
| 1033 | return -EFAULT; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1034 | |
| 1035 | err = strict_strtol(strstrip(buffer), 0, &oom_adjust); |
| 1036 | if (err) |
| 1037 | return -EINVAL; |
Alexey Dobriyan | 8ac773b | 2006-10-19 23:28:32 -0700 | [diff] [blame] | 1038 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
| 1039 | oom_adjust != OOM_DISABLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | return -EINVAL; |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1041 | |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1042 | task = get_proc_task(file->f_path.dentry->d_inode); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1043 | if (!task) |
| 1044 | return -ESRCH; |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1045 | if (!lock_task_sighand(task, &flags)) { |
| 1046 | put_task_struct(task); |
| 1047 | return -ESRCH; |
| 1048 | } |
| 1049 | |
| 1050 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { |
| 1051 | unlock_task_sighand(task, &flags); |
Guillem Jover | 8fb4fc6 | 2006-12-06 20:32:24 -0800 | [diff] [blame] | 1052 | put_task_struct(task); |
| 1053 | return -EACCES; |
| 1054 | } |
KOSAKI Motohiro | 28b83c5 | 2009-09-21 17:03:13 -0700 | [diff] [blame] | 1055 | |
| 1056 | task->signal->oom_adj = oom_adjust; |
| 1057 | |
| 1058 | unlock_task_sighand(task, &flags); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1059 | put_task_struct(task); |
KOSAKI Motohiro | 5d863b8 | 2009-09-21 17:03:16 -0700 | [diff] [blame] | 1060 | |
| 1061 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } |
| 1063 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1064 | static const struct file_operations proc_oom_adjust_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | .read = oom_adjust_read, |
| 1066 | .write = oom_adjust_write, |
| 1067 | }; |
| 1068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | #ifdef CONFIG_AUDITSYSCALL |
| 1070 | #define TMPBUFLEN 21 |
| 1071 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
| 1072 | size_t count, loff_t *ppos) |
| 1073 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1074 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1075 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | ssize_t length; |
| 1077 | char tmpbuf[TMPBUFLEN]; |
| 1078 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1079 | if (!task) |
| 1080 | return -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
Al Viro | 0c11b94 | 2008-01-10 04:20:52 -0500 | [diff] [blame] | 1082 | audit_get_loginuid(task)); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1083 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1085 | } |
| 1086 | |
| 1087 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, |
| 1088 | size_t count, loff_t *ppos) |
| 1089 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1090 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | char *page, *tmp; |
| 1092 | ssize_t length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | uid_t loginuid; |
| 1094 | |
| 1095 | if (!capable(CAP_AUDIT_CONTROL)) |
| 1096 | return -EPERM; |
| 1097 | |
Eric W. Biederman | 13b41b0 | 2006-06-26 00:25:56 -0700 | [diff] [blame] | 1098 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | return -EPERM; |
| 1100 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1101 | if (count >= PAGE_SIZE) |
| 1102 | count = PAGE_SIZE - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
| 1104 | if (*ppos != 0) { |
| 1105 | /* No partial writes. */ |
| 1106 | return -EINVAL; |
| 1107 | } |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1108 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | if (!page) |
| 1110 | return -ENOMEM; |
| 1111 | length = -EFAULT; |
| 1112 | if (copy_from_user(page, buf, count)) |
| 1113 | goto out_free_page; |
| 1114 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1115 | page[count] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | loginuid = simple_strtoul(page, &tmp, 10); |
| 1117 | if (tmp == page) { |
| 1118 | length = -EINVAL; |
| 1119 | goto out_free_page; |
| 1120 | |
| 1121 | } |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1122 | length = audit_set_loginuid(current, loginuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | if (likely(length == 0)) |
| 1124 | length = count; |
| 1125 | |
| 1126 | out_free_page: |
| 1127 | free_page((unsigned long) page); |
| 1128 | return length; |
| 1129 | } |
| 1130 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1131 | static const struct file_operations proc_loginuid_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | .read = proc_loginuid_read, |
| 1133 | .write = proc_loginuid_write, |
| 1134 | }; |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1135 | |
| 1136 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, |
| 1137 | size_t count, loff_t *ppos) |
| 1138 | { |
| 1139 | struct inode * inode = file->f_path.dentry->d_inode; |
| 1140 | struct task_struct *task = get_proc_task(inode); |
| 1141 | ssize_t length; |
| 1142 | char tmpbuf[TMPBUFLEN]; |
| 1143 | |
| 1144 | if (!task) |
| 1145 | return -ESRCH; |
| 1146 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| 1147 | audit_get_sessionid(task)); |
| 1148 | put_task_struct(task); |
| 1149 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1150 | } |
| 1151 | |
| 1152 | static const struct file_operations proc_sessionid_operations = { |
| 1153 | .read = proc_sessionid_read, |
| 1154 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | #endif |
| 1156 | |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1157 | #ifdef CONFIG_FAULT_INJECTION |
| 1158 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, |
| 1159 | size_t count, loff_t *ppos) |
| 1160 | { |
| 1161 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 1162 | char buffer[PROC_NUMBUF]; |
| 1163 | size_t len; |
| 1164 | int make_it_fail; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1165 | |
| 1166 | if (!task) |
| 1167 | return -ESRCH; |
| 1168 | make_it_fail = task->make_it_fail; |
| 1169 | put_task_struct(task); |
| 1170 | |
| 1171 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1172 | |
| 1173 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1174 | } |
| 1175 | |
| 1176 | static ssize_t proc_fault_inject_write(struct file * file, |
| 1177 | const char __user * buf, size_t count, loff_t *ppos) |
| 1178 | { |
| 1179 | struct task_struct *task; |
| 1180 | char buffer[PROC_NUMBUF], *end; |
| 1181 | int make_it_fail; |
| 1182 | |
| 1183 | if (!capable(CAP_SYS_RESOURCE)) |
| 1184 | return -EPERM; |
| 1185 | memset(buffer, 0, sizeof(buffer)); |
| 1186 | if (count > sizeof(buffer) - 1) |
| 1187 | count = sizeof(buffer) - 1; |
| 1188 | if (copy_from_user(buffer, buf, count)) |
| 1189 | return -EFAULT; |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1190 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
| 1191 | if (*end) |
| 1192 | return -EINVAL; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1193 | task = get_proc_task(file->f_dentry->d_inode); |
| 1194 | if (!task) |
| 1195 | return -ESRCH; |
| 1196 | task->make_it_fail = make_it_fail; |
| 1197 | put_task_struct(task); |
Vincent Li | cba8aaf | 2009-09-22 16:45:38 -0700 | [diff] [blame] | 1198 | |
| 1199 | return count; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1200 | } |
| 1201 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1202 | static const struct file_operations proc_fault_inject_operations = { |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1203 | .read = proc_fault_inject_read, |
| 1204 | .write = proc_fault_inject_write, |
| 1205 | }; |
| 1206 | #endif |
| 1207 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 1208 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1209 | #ifdef CONFIG_SCHED_DEBUG |
| 1210 | /* |
| 1211 | * Print out various scheduling related per-task fields: |
| 1212 | */ |
| 1213 | static int sched_show(struct seq_file *m, void *v) |
| 1214 | { |
| 1215 | struct inode *inode = m->private; |
| 1216 | struct task_struct *p; |
| 1217 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1218 | p = get_proc_task(inode); |
| 1219 | if (!p) |
| 1220 | return -ESRCH; |
| 1221 | proc_sched_show_task(p, m); |
| 1222 | |
| 1223 | put_task_struct(p); |
| 1224 | |
| 1225 | return 0; |
| 1226 | } |
| 1227 | |
| 1228 | static ssize_t |
| 1229 | sched_write(struct file *file, const char __user *buf, |
| 1230 | size_t count, loff_t *offset) |
| 1231 | { |
| 1232 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1233 | struct task_struct *p; |
| 1234 | |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1235 | p = get_proc_task(inode); |
| 1236 | if (!p) |
| 1237 | return -ESRCH; |
| 1238 | proc_sched_set_task(p); |
| 1239 | |
| 1240 | put_task_struct(p); |
| 1241 | |
| 1242 | return count; |
| 1243 | } |
| 1244 | |
| 1245 | static int sched_open(struct inode *inode, struct file *filp) |
| 1246 | { |
| 1247 | int ret; |
| 1248 | |
| 1249 | ret = single_open(filp, sched_show, NULL); |
| 1250 | if (!ret) { |
| 1251 | struct seq_file *m = filp->private_data; |
| 1252 | |
| 1253 | m->private = inode; |
| 1254 | } |
| 1255 | return ret; |
| 1256 | } |
| 1257 | |
| 1258 | static const struct file_operations proc_pid_sched_operations = { |
| 1259 | .open = sched_open, |
| 1260 | .read = seq_read, |
| 1261 | .write = sched_write, |
| 1262 | .llseek = seq_lseek, |
Alexey Dobriyan | 5ea473a | 2007-07-31 00:38:50 -0700 | [diff] [blame] | 1263 | .release = single_release, |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 1264 | }; |
| 1265 | |
| 1266 | #endif |
| 1267 | |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 1268 | static ssize_t comm_write(struct file *file, const char __user *buf, |
| 1269 | size_t count, loff_t *offset) |
| 1270 | { |
| 1271 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1272 | struct task_struct *p; |
| 1273 | char buffer[TASK_COMM_LEN]; |
| 1274 | |
| 1275 | memset(buffer, 0, sizeof(buffer)); |
| 1276 | if (count > sizeof(buffer) - 1) |
| 1277 | count = sizeof(buffer) - 1; |
| 1278 | if (copy_from_user(buffer, buf, count)) |
| 1279 | return -EFAULT; |
| 1280 | |
| 1281 | p = get_proc_task(inode); |
| 1282 | if (!p) |
| 1283 | return -ESRCH; |
| 1284 | |
| 1285 | if (same_thread_group(current, p)) |
| 1286 | set_task_comm(p, buffer); |
| 1287 | else |
| 1288 | count = -EINVAL; |
| 1289 | |
| 1290 | put_task_struct(p); |
| 1291 | |
| 1292 | return count; |
| 1293 | } |
| 1294 | |
| 1295 | static int comm_show(struct seq_file *m, void *v) |
| 1296 | { |
| 1297 | struct inode *inode = m->private; |
| 1298 | struct task_struct *p; |
| 1299 | |
| 1300 | p = get_proc_task(inode); |
| 1301 | if (!p) |
| 1302 | return -ESRCH; |
| 1303 | |
| 1304 | task_lock(p); |
| 1305 | seq_printf(m, "%s\n", p->comm); |
| 1306 | task_unlock(p); |
| 1307 | |
| 1308 | put_task_struct(p); |
| 1309 | |
| 1310 | return 0; |
| 1311 | } |
| 1312 | |
| 1313 | static int comm_open(struct inode *inode, struct file *filp) |
| 1314 | { |
| 1315 | int ret; |
| 1316 | |
| 1317 | ret = single_open(filp, comm_show, NULL); |
| 1318 | if (!ret) { |
| 1319 | struct seq_file *m = filp->private_data; |
| 1320 | |
| 1321 | m->private = inode; |
| 1322 | } |
| 1323 | return ret; |
| 1324 | } |
| 1325 | |
| 1326 | static const struct file_operations proc_pid_set_comm_operations = { |
| 1327 | .open = comm_open, |
| 1328 | .read = seq_read, |
| 1329 | .write = comm_write, |
| 1330 | .llseek = seq_lseek, |
| 1331 | .release = single_release, |
| 1332 | }; |
| 1333 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1334 | /* |
| 1335 | * We added or removed a vma mapping the executable. The vmas are only mapped |
| 1336 | * during exec and are not mapped with the mmap system call. |
| 1337 | * Callers must hold down_write() on the mm's mmap_sem for these |
| 1338 | */ |
| 1339 | void added_exe_file_vma(struct mm_struct *mm) |
| 1340 | { |
| 1341 | mm->num_exe_file_vmas++; |
| 1342 | } |
| 1343 | |
| 1344 | void removed_exe_file_vma(struct mm_struct *mm) |
| 1345 | { |
| 1346 | mm->num_exe_file_vmas--; |
| 1347 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ |
| 1348 | fput(mm->exe_file); |
| 1349 | mm->exe_file = NULL; |
| 1350 | } |
| 1351 | |
| 1352 | } |
| 1353 | |
| 1354 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) |
| 1355 | { |
| 1356 | if (new_exe_file) |
| 1357 | get_file(new_exe_file); |
| 1358 | if (mm->exe_file) |
| 1359 | fput(mm->exe_file); |
| 1360 | mm->exe_file = new_exe_file; |
| 1361 | mm->num_exe_file_vmas = 0; |
| 1362 | } |
| 1363 | |
| 1364 | struct file *get_mm_exe_file(struct mm_struct *mm) |
| 1365 | { |
| 1366 | struct file *exe_file; |
| 1367 | |
| 1368 | /* We need mmap_sem to protect against races with removal of |
| 1369 | * VM_EXECUTABLE vmas */ |
| 1370 | down_read(&mm->mmap_sem); |
| 1371 | exe_file = mm->exe_file; |
| 1372 | if (exe_file) |
| 1373 | get_file(exe_file); |
| 1374 | up_read(&mm->mmap_sem); |
| 1375 | return exe_file; |
| 1376 | } |
| 1377 | |
| 1378 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) |
| 1379 | { |
| 1380 | /* It's safe to write the exe_file pointer without exe_file_lock because |
| 1381 | * this is called during fork when the task is not yet in /proc */ |
| 1382 | newmm->exe_file = get_mm_exe_file(oldmm); |
| 1383 | } |
| 1384 | |
| 1385 | static int proc_exe_link(struct inode *inode, struct path *exe_path) |
| 1386 | { |
| 1387 | struct task_struct *task; |
| 1388 | struct mm_struct *mm; |
| 1389 | struct file *exe_file; |
| 1390 | |
| 1391 | task = get_proc_task(inode); |
| 1392 | if (!task) |
| 1393 | return -ENOENT; |
| 1394 | mm = get_task_mm(task); |
| 1395 | put_task_struct(task); |
| 1396 | if (!mm) |
| 1397 | return -ENOENT; |
| 1398 | exe_file = get_mm_exe_file(mm); |
| 1399 | mmput(mm); |
| 1400 | if (exe_file) { |
| 1401 | *exe_path = exe_file->f_path; |
| 1402 | path_get(&exe_file->f_path); |
| 1403 | fput(exe_file); |
| 1404 | return 0; |
| 1405 | } else |
| 1406 | return -ENOENT; |
| 1407 | } |
| 1408 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1409 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | { |
| 1411 | struct inode *inode = dentry->d_inode; |
| 1412 | int error = -EACCES; |
| 1413 | |
| 1414 | /* We don't need a base pointer in the /proc filesystem */ |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 1415 | path_put(&nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1417 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1418 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1421 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | out: |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1423 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | } |
| 1425 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1426 | 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] | 1427 | { |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1428 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1429 | char *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | int len; |
| 1431 | |
| 1432 | if (!tmp) |
| 1433 | return -ENOMEM; |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1434 | |
Jan Blunck | cf28b48 | 2008-02-14 19:38:44 -0800 | [diff] [blame] | 1435 | pathname = d_path(path, tmp, PAGE_SIZE); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1436 | len = PTR_ERR(pathname); |
| 1437 | if (IS_ERR(pathname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | goto out; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1439 | len = tmp + PAGE_SIZE - 1 - pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | |
| 1441 | if (len > buflen) |
| 1442 | len = buflen; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1443 | if (copy_to_user(buffer, pathname, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | len = -EFAULT; |
| 1445 | out: |
| 1446 | free_page((unsigned long)tmp); |
| 1447 | return len; |
| 1448 | } |
| 1449 | |
| 1450 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) |
| 1451 | { |
| 1452 | int error = -EACCES; |
| 1453 | struct inode *inode = dentry->d_inode; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1454 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1456 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1457 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1460 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | if (error) |
| 1462 | goto out; |
| 1463 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1464 | error = do_proc_readlink(&path, buffer, buflen); |
| 1465 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | return error; |
| 1468 | } |
| 1469 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1470 | static const struct inode_operations proc_pid_link_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | .readlink = proc_pid_readlink, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1472 | .follow_link = proc_pid_follow_link, |
| 1473 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | }; |
| 1475 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1476 | |
| 1477 | /* building an inode */ |
| 1478 | |
| 1479 | static int task_dumpable(struct task_struct *task) |
| 1480 | { |
| 1481 | int dumpable = 0; |
| 1482 | struct mm_struct *mm; |
| 1483 | |
| 1484 | task_lock(task); |
| 1485 | mm = task->mm; |
| 1486 | if (mm) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 1487 | dumpable = get_dumpable(mm); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1488 | task_unlock(task); |
| 1489 | if(dumpable == 1) |
| 1490 | return 1; |
| 1491 | return 0; |
| 1492 | } |
| 1493 | |
| 1494 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1495 | 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] | 1496 | { |
| 1497 | struct inode * inode; |
| 1498 | struct proc_inode *ei; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1499 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1500 | |
| 1501 | /* We need a new inode */ |
| 1502 | |
| 1503 | inode = new_inode(sb); |
| 1504 | if (!inode) |
| 1505 | goto out; |
| 1506 | |
| 1507 | /* Common stuff */ |
| 1508 | ei = PROC_I(inode); |
| 1509 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1510 | inode->i_op = &proc_def_inode_operations; |
| 1511 | |
| 1512 | /* |
| 1513 | * grab the reference to task. |
| 1514 | */ |
Oleg Nesterov | 1a657f78 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 1515 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1516 | if (!ei->pid) |
| 1517 | goto out_unlock; |
| 1518 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1519 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1520 | rcu_read_lock(); |
| 1521 | cred = __task_cred(task); |
| 1522 | inode->i_uid = cred->euid; |
| 1523 | inode->i_gid = cred->egid; |
| 1524 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1525 | } |
| 1526 | security_task_to_inode(task, inode); |
| 1527 | |
| 1528 | out: |
| 1529 | return inode; |
| 1530 | |
| 1531 | out_unlock: |
| 1532 | iput(inode); |
| 1533 | return NULL; |
| 1534 | } |
| 1535 | |
| 1536 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 1537 | { |
| 1538 | struct inode *inode = dentry->d_inode; |
| 1539 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1540 | const struct cred *cred; |
| 1541 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1542 | generic_fillattr(inode, stat); |
| 1543 | |
| 1544 | rcu_read_lock(); |
| 1545 | stat->uid = 0; |
| 1546 | stat->gid = 0; |
| 1547 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
| 1548 | if (task) { |
| 1549 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1550 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1551 | cred = __task_cred(task); |
| 1552 | stat->uid = cred->euid; |
| 1553 | stat->gid = cred->egid; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1554 | } |
| 1555 | } |
| 1556 | rcu_read_unlock(); |
| 1557 | return 0; |
| 1558 | } |
| 1559 | |
| 1560 | /* dentry stuff */ |
| 1561 | |
| 1562 | /* |
| 1563 | * Exceptional case: normally we are not allowed to unhash a busy |
| 1564 | * directory. In this case, however, we can do it - no aliasing problems |
| 1565 | * due to the way we treat inodes. |
| 1566 | * |
| 1567 | * Rewrite the inode's ownerships here because the owning task may have |
| 1568 | * performed a setuid(), etc. |
| 1569 | * |
| 1570 | * Before the /proc/pid/status file was created the only way to read |
| 1571 | * the effective uid of a /process was to stat /proc/pid. Reading |
| 1572 | * /proc/pid/status is slow enough that procps and other packages |
| 1573 | * kept stating /proc/pid. To keep the rules in /proc simple I have |
| 1574 | * made this apply to all per process world readable and executable |
| 1575 | * directories. |
| 1576 | */ |
| 1577 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1578 | { |
| 1579 | struct inode *inode = dentry->d_inode; |
| 1580 | struct task_struct *task = get_proc_task(inode); |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1581 | const struct cred *cred; |
| 1582 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1583 | if (task) { |
| 1584 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1585 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1586 | rcu_read_lock(); |
| 1587 | cred = __task_cred(task); |
| 1588 | inode->i_uid = cred->euid; |
| 1589 | inode->i_gid = cred->egid; |
| 1590 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1591 | } else { |
| 1592 | inode->i_uid = 0; |
| 1593 | inode->i_gid = 0; |
| 1594 | } |
| 1595 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1596 | security_task_to_inode(task, inode); |
| 1597 | put_task_struct(task); |
| 1598 | return 1; |
| 1599 | } |
| 1600 | d_drop(dentry); |
| 1601 | return 0; |
| 1602 | } |
| 1603 | |
| 1604 | static int pid_delete_dentry(struct dentry * dentry) |
| 1605 | { |
| 1606 | /* Is the task we represent dead? |
| 1607 | * If so, then don't put the dentry on the lru list, |
| 1608 | * kill it immediately. |
| 1609 | */ |
| 1610 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; |
| 1611 | } |
| 1612 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 1613 | static const struct dentry_operations pid_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1614 | { |
| 1615 | .d_revalidate = pid_revalidate, |
| 1616 | .d_delete = pid_delete_dentry, |
| 1617 | }; |
| 1618 | |
| 1619 | /* Lookups */ |
| 1620 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1621 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
| 1622 | struct task_struct *, const void *); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1623 | |
Eric W. Biederman | 1c0d04c | 2006-10-02 02:18:57 -0700 | [diff] [blame] | 1624 | /* |
| 1625 | * Fill a directory entry. |
| 1626 | * |
| 1627 | * If possible create the dcache entry and derive our inode number and |
| 1628 | * file type from dcache entry. |
| 1629 | * |
| 1630 | * Since all of the proc inode numbers are dynamically generated, the inode |
| 1631 | * numbers do not exist until the inode is cache. This means creating the |
| 1632 | * the dcache entry in readdir is necessary to keep the inode numbers |
| 1633 | * reported by readdir in sync with the inode numbers reported |
| 1634 | * by stat. |
| 1635 | */ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1636 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 1637 | char *name, int len, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1638 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1639 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1640 | struct dentry *child, *dir = filp->f_path.dentry; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1641 | struct inode *inode; |
| 1642 | struct qstr qname; |
| 1643 | ino_t ino = 0; |
| 1644 | unsigned type = DT_UNKNOWN; |
| 1645 | |
| 1646 | qname.name = name; |
| 1647 | qname.len = len; |
| 1648 | qname.hash = full_name_hash(name, len); |
| 1649 | |
| 1650 | child = d_lookup(dir, &qname); |
| 1651 | if (!child) { |
| 1652 | struct dentry *new; |
| 1653 | new = d_alloc(dir, &qname); |
| 1654 | if (new) { |
| 1655 | child = instantiate(dir->d_inode, new, task, ptr); |
| 1656 | if (child) |
| 1657 | dput(new); |
| 1658 | else |
| 1659 | child = new; |
| 1660 | } |
| 1661 | } |
| 1662 | if (!child || IS_ERR(child) || !child->d_inode) |
| 1663 | goto end_instantiate; |
| 1664 | inode = child->d_inode; |
| 1665 | if (inode) { |
| 1666 | ino = inode->i_ino; |
| 1667 | type = inode->i_mode >> 12; |
| 1668 | } |
| 1669 | dput(child); |
| 1670 | end_instantiate: |
| 1671 | if (!ino) |
| 1672 | ino = find_inode_number(dir, &qname); |
| 1673 | if (!ino) |
| 1674 | ino = 1; |
| 1675 | return filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1676 | } |
| 1677 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1678 | static unsigned name_to_int(struct dentry *dentry) |
| 1679 | { |
| 1680 | const char *name = dentry->d_name.name; |
| 1681 | int len = dentry->d_name.len; |
| 1682 | unsigned n = 0; |
| 1683 | |
| 1684 | if (len > 1 && *name == '0') |
| 1685 | goto out; |
| 1686 | while (len-- > 0) { |
| 1687 | unsigned c = *name++ - '0'; |
| 1688 | if (c > 9) |
| 1689 | goto out; |
| 1690 | if (n >= (~0U-9)/10) |
| 1691 | goto out; |
| 1692 | n *= 10; |
| 1693 | n += c; |
| 1694 | } |
| 1695 | return n; |
| 1696 | out: |
| 1697 | return ~0U; |
| 1698 | } |
| 1699 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1700 | #define PROC_FDINFO_MAX 64 |
| 1701 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1702 | 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] | 1703 | { |
| 1704 | struct task_struct *task = get_proc_task(inode); |
| 1705 | struct files_struct *files = NULL; |
| 1706 | struct file *file; |
| 1707 | int fd = proc_fd(inode); |
| 1708 | |
| 1709 | if (task) { |
| 1710 | files = get_files_struct(task); |
| 1711 | put_task_struct(task); |
| 1712 | } |
| 1713 | if (files) { |
| 1714 | /* |
| 1715 | * We are not taking a ref to the file structure, so we must |
| 1716 | * hold ->file_lock. |
| 1717 | */ |
| 1718 | spin_lock(&files->file_lock); |
| 1719 | file = fcheck_files(files, fd); |
| 1720 | if (file) { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1721 | if (path) { |
| 1722 | *path = file->f_path; |
| 1723 | path_get(&file->f_path); |
| 1724 | } |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1725 | if (info) |
| 1726 | snprintf(info, PROC_FDINFO_MAX, |
| 1727 | "pos:\t%lli\n" |
| 1728 | "flags:\t0%o\n", |
| 1729 | (long long) file->f_pos, |
| 1730 | file->f_flags); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1731 | spin_unlock(&files->file_lock); |
| 1732 | put_files_struct(files); |
| 1733 | return 0; |
| 1734 | } |
| 1735 | spin_unlock(&files->file_lock); |
| 1736 | put_files_struct(files); |
| 1737 | } |
| 1738 | return -ENOENT; |
| 1739 | } |
| 1740 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1741 | static int proc_fd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1742 | { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1743 | return proc_fd_info(inode, path, NULL); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1744 | } |
| 1745 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1746 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1747 | { |
| 1748 | struct inode *inode = dentry->d_inode; |
| 1749 | struct task_struct *task = get_proc_task(inode); |
| 1750 | int fd = proc_fd(inode); |
| 1751 | struct files_struct *files; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1752 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1753 | |
| 1754 | if (task) { |
| 1755 | files = get_files_struct(task); |
| 1756 | if (files) { |
| 1757 | rcu_read_lock(); |
| 1758 | if (fcheck_files(files, fd)) { |
| 1759 | rcu_read_unlock(); |
| 1760 | put_files_struct(files); |
| 1761 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1762 | rcu_read_lock(); |
| 1763 | cred = __task_cred(task); |
| 1764 | inode->i_uid = cred->euid; |
| 1765 | inode->i_gid = cred->egid; |
| 1766 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1767 | } else { |
| 1768 | inode->i_uid = 0; |
| 1769 | inode->i_gid = 0; |
| 1770 | } |
| 1771 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1772 | security_task_to_inode(task, inode); |
| 1773 | put_task_struct(task); |
| 1774 | return 1; |
| 1775 | } |
| 1776 | rcu_read_unlock(); |
| 1777 | put_files_struct(files); |
| 1778 | } |
| 1779 | put_task_struct(task); |
| 1780 | } |
| 1781 | d_drop(dentry); |
| 1782 | return 0; |
| 1783 | } |
| 1784 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 1785 | static const struct dentry_operations tid_fd_dentry_operations = |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1786 | { |
| 1787 | .d_revalidate = tid_fd_revalidate, |
| 1788 | .d_delete = pid_delete_dentry, |
| 1789 | }; |
| 1790 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1791 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1792 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1793 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1794 | unsigned fd = *(const unsigned *)ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1795 | struct file *file; |
| 1796 | struct files_struct *files; |
| 1797 | struct inode *inode; |
| 1798 | struct proc_inode *ei; |
| 1799 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1800 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1801 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1802 | if (!inode) |
| 1803 | goto out; |
| 1804 | ei = PROC_I(inode); |
| 1805 | ei->fd = fd; |
| 1806 | files = get_files_struct(task); |
| 1807 | if (!files) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1808 | goto out_iput; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1809 | inode->i_mode = S_IFLNK; |
| 1810 | |
| 1811 | /* |
| 1812 | * We are not taking a ref to the file structure, so we must |
| 1813 | * hold ->file_lock. |
| 1814 | */ |
| 1815 | spin_lock(&files->file_lock); |
| 1816 | file = fcheck_files(files, fd); |
| 1817 | if (!file) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1818 | goto out_unlock; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1819 | if (file->f_mode & FMODE_READ) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1820 | inode->i_mode |= S_IRUSR | S_IXUSR; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1821 | if (file->f_mode & FMODE_WRITE) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1822 | inode->i_mode |= S_IWUSR | S_IXUSR; |
| 1823 | spin_unlock(&files->file_lock); |
| 1824 | put_files_struct(files); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1825 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1826 | inode->i_op = &proc_pid_link_inode_operations; |
| 1827 | inode->i_size = 64; |
| 1828 | ei->op.proc_get_link = proc_fd_link; |
| 1829 | dentry->d_op = &tid_fd_dentry_operations; |
| 1830 | d_add(dentry, inode); |
| 1831 | /* Close the race of the process dying before we return the dentry */ |
| 1832 | if (tid_fd_revalidate(dentry, NULL)) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1833 | error = NULL; |
| 1834 | |
| 1835 | out: |
| 1836 | return error; |
| 1837 | out_unlock: |
| 1838 | spin_unlock(&files->file_lock); |
| 1839 | put_files_struct(files); |
| 1840 | out_iput: |
| 1841 | iput(inode); |
| 1842 | goto out; |
| 1843 | } |
| 1844 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1845 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
| 1846 | struct dentry *dentry, |
| 1847 | instantiate_t instantiate) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1848 | { |
| 1849 | struct task_struct *task = get_proc_task(dir); |
| 1850 | unsigned fd = name_to_int(dentry); |
| 1851 | struct dentry *result = ERR_PTR(-ENOENT); |
| 1852 | |
| 1853 | if (!task) |
| 1854 | goto out_no_task; |
| 1855 | if (fd == ~0U) |
| 1856 | goto out; |
| 1857 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1858 | result = instantiate(dir, dentry, task, &fd); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1859 | out: |
| 1860 | put_task_struct(task); |
| 1861 | out_no_task: |
| 1862 | return result; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1863 | } |
| 1864 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1865 | static int proc_readfd_common(struct file * filp, void * dirent, |
| 1866 | filldir_t filldir, instantiate_t instantiate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1868 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 1869 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1870 | struct task_struct *p = get_proc_task(inode); |
Pavel Emelyanov | 457c251 | 2007-10-18 23:40:43 -0700 | [diff] [blame] | 1871 | unsigned int fd, ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | struct files_struct * files; |
| 1874 | |
| 1875 | retval = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1876 | if (!p) |
| 1877 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1879 | |
| 1880 | fd = filp->f_pos; |
| 1881 | switch (fd) { |
| 1882 | case 0: |
| 1883 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
| 1884 | goto out; |
| 1885 | filp->f_pos++; |
| 1886 | case 1: |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 1887 | ino = parent_ino(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) |
| 1889 | goto out; |
| 1890 | filp->f_pos++; |
| 1891 | default: |
| 1892 | files = get_files_struct(p); |
| 1893 | if (!files) |
| 1894 | goto out; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1895 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | for (fd = filp->f_pos-2; |
Al Viro | 9b4f526 | 2008-04-22 01:32:44 -0400 | [diff] [blame] | 1897 | fd < files_fdtable(files)->max_fds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | fd++, filp->f_pos++) { |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1899 | char name[PROC_NUMBUF]; |
| 1900 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | |
| 1902 | if (!fcheck_files(files, fd)) |
| 1903 | continue; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1904 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1906 | len = snprintf(name, sizeof(name), "%d", fd); |
| 1907 | if (proc_fill_cache(filp, dirent, filldir, |
| 1908 | name, len, instantiate, |
| 1909 | p, &fd) < 0) { |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1910 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | break; |
| 1912 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1913 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1915 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | put_files_struct(files); |
| 1917 | } |
| 1918 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1919 | put_task_struct(p); |
| 1920 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | return retval; |
| 1922 | } |
| 1923 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1924 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
| 1925 | struct nameidata *nd) |
| 1926 | { |
| 1927 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); |
| 1928 | } |
| 1929 | |
| 1930 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) |
| 1931 | { |
| 1932 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); |
| 1933 | } |
| 1934 | |
| 1935 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, |
| 1936 | size_t len, loff_t *ppos) |
| 1937 | { |
| 1938 | char tmp[PROC_FDINFO_MAX]; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1939 | 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] | 1940 | if (!err) |
| 1941 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); |
| 1942 | return err; |
| 1943 | } |
| 1944 | |
| 1945 | static const struct file_operations proc_fdinfo_file_operations = { |
| 1946 | .open = nonseekable_open, |
| 1947 | .read = proc_fdinfo_read, |
| 1948 | }; |
| 1949 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1950 | static const struct file_operations proc_fd_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | .read = generic_read_dir, |
| 1952 | .readdir = proc_readfd, |
| 1953 | }; |
| 1954 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | /* |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 1956 | * /proc/pid/fd needs a special permission handler so that a process can still |
| 1957 | * access /proc/self/fd after it has executed a setuid(). |
| 1958 | */ |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 1959 | static int proc_fd_permission(struct inode *inode, int mask) |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 1960 | { |
| 1961 | int rv; |
| 1962 | |
| 1963 | rv = generic_permission(inode, mask, NULL); |
| 1964 | if (rv == 0) |
| 1965 | return 0; |
| 1966 | if (task_pid(current) == proc_pid(inode)) |
| 1967 | rv = 0; |
| 1968 | return rv; |
| 1969 | } |
| 1970 | |
| 1971 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | * proc directories can do almost nothing.. |
| 1973 | */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1974 | static const struct inode_operations proc_fd_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | .lookup = proc_lookupfd, |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 1976 | .permission = proc_fd_permission, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1977 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | }; |
| 1979 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1980 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
| 1981 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
| 1982 | { |
| 1983 | unsigned fd = *(unsigned *)ptr; |
| 1984 | struct inode *inode; |
| 1985 | struct proc_inode *ei; |
| 1986 | struct dentry *error = ERR_PTR(-ENOENT); |
| 1987 | |
| 1988 | inode = proc_pid_make_inode(dir->i_sb, task); |
| 1989 | if (!inode) |
| 1990 | goto out; |
| 1991 | ei = PROC_I(inode); |
| 1992 | ei->fd = fd; |
| 1993 | inode->i_mode = S_IFREG | S_IRUSR; |
| 1994 | inode->i_fop = &proc_fdinfo_file_operations; |
| 1995 | dentry->d_op = &tid_fd_dentry_operations; |
| 1996 | d_add(dentry, inode); |
| 1997 | /* Close the race of the process dying before we return the dentry */ |
| 1998 | if (tid_fd_revalidate(dentry, NULL)) |
| 1999 | error = NULL; |
| 2000 | |
| 2001 | out: |
| 2002 | return error; |
| 2003 | } |
| 2004 | |
| 2005 | static struct dentry *proc_lookupfdinfo(struct inode *dir, |
| 2006 | struct dentry *dentry, |
| 2007 | struct nameidata *nd) |
| 2008 | { |
| 2009 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); |
| 2010 | } |
| 2011 | |
| 2012 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) |
| 2013 | { |
| 2014 | return proc_readfd_common(filp, dirent, filldir, |
| 2015 | proc_fdinfo_instantiate); |
| 2016 | } |
| 2017 | |
| 2018 | static const struct file_operations proc_fdinfo_operations = { |
| 2019 | .read = generic_read_dir, |
| 2020 | .readdir = proc_readfdinfo, |
| 2021 | }; |
| 2022 | |
| 2023 | /* |
| 2024 | * proc directories can do almost nothing.. |
| 2025 | */ |
| 2026 | static const struct inode_operations proc_fdinfo_inode_operations = { |
| 2027 | .lookup = proc_lookupfdinfo, |
| 2028 | .setattr = proc_setattr, |
| 2029 | }; |
| 2030 | |
| 2031 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2032 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2033 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2034 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2035 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2036 | struct inode *inode; |
| 2037 | struct proc_inode *ei; |
KOSAKI Motohiro | bd6daba | 2009-05-28 14:34:21 -0700 | [diff] [blame] | 2038 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2039 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2040 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2041 | if (!inode) |
| 2042 | goto out; |
| 2043 | |
| 2044 | ei = PROC_I(inode); |
| 2045 | inode->i_mode = p->mode; |
| 2046 | if (S_ISDIR(inode->i_mode)) |
| 2047 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ |
| 2048 | if (p->iop) |
| 2049 | inode->i_op = p->iop; |
| 2050 | if (p->fop) |
| 2051 | inode->i_fop = p->fop; |
| 2052 | ei->op = p->op; |
| 2053 | dentry->d_op = &pid_dentry_operations; |
| 2054 | d_add(dentry, inode); |
| 2055 | /* Close the race of the process dying before we return the dentry */ |
| 2056 | if (pid_revalidate(dentry, NULL)) |
| 2057 | error = NULL; |
| 2058 | out: |
| 2059 | return error; |
| 2060 | } |
| 2061 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | static struct dentry *proc_pident_lookup(struct inode *dir, |
| 2063 | struct dentry *dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2064 | const struct pid_entry *ents, |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2065 | unsigned int nents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2067 | struct dentry *error; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2068 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2069 | const struct pid_entry *p, *last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2071 | error = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2073 | if (!task) |
| 2074 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2076 | /* |
| 2077 | * Yes, it does not scale. And it should not. Don't add |
| 2078 | * new entries into /proc/<tgid>/ without very good reasons. |
| 2079 | */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2080 | last = &ents[nents - 1]; |
| 2081 | for (p = ents; p <= last; p++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | if (p->len != dentry->d_name.len) |
| 2083 | continue; |
| 2084 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2085 | break; |
| 2086 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2087 | if (p > last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | goto out; |
| 2089 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2090 | error = proc_pident_instantiate(dir, dentry, task, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2091 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2092 | put_task_struct(task); |
| 2093 | out_no_task: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2094 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | } |
| 2096 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2097 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
| 2098 | 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] | 2099 | { |
| 2100 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2101 | proc_pident_instantiate, task, p); |
| 2102 | } |
| 2103 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2104 | static int proc_pident_readdir(struct file *filp, |
| 2105 | void *dirent, filldir_t filldir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2106 | const struct pid_entry *ents, unsigned int nents) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2107 | { |
| 2108 | int i; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2109 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2110 | struct inode *inode = dentry->d_inode; |
| 2111 | struct task_struct *task = get_proc_task(inode); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2112 | const struct pid_entry *p, *last; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2113 | ino_t ino; |
| 2114 | int ret; |
| 2115 | |
| 2116 | ret = -ENOENT; |
| 2117 | if (!task) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2118 | goto out_no_task; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2119 | |
| 2120 | ret = 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2121 | i = filp->f_pos; |
| 2122 | switch (i) { |
| 2123 | case 0: |
| 2124 | ino = inode->i_ino; |
| 2125 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| 2126 | goto out; |
| 2127 | i++; |
| 2128 | filp->f_pos++; |
| 2129 | /* fall through */ |
| 2130 | case 1: |
| 2131 | ino = parent_ino(dentry); |
| 2132 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| 2133 | goto out; |
| 2134 | i++; |
| 2135 | filp->f_pos++; |
| 2136 | /* fall through */ |
| 2137 | default: |
| 2138 | i -= 2; |
| 2139 | if (i >= nents) { |
| 2140 | ret = 1; |
| 2141 | goto out; |
| 2142 | } |
| 2143 | p = ents + i; |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2144 | last = &ents[nents - 1]; |
| 2145 | while (p <= last) { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2146 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2147 | goto out; |
| 2148 | filp->f_pos++; |
| 2149 | p++; |
| 2150 | } |
| 2151 | } |
| 2152 | |
| 2153 | ret = 1; |
| 2154 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2155 | put_task_struct(task); |
| 2156 | out_no_task: |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2157 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | } |
| 2159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | #ifdef CONFIG_SECURITY |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2161 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, |
| 2162 | size_t count, loff_t *ppos) |
| 2163 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2164 | struct inode * inode = file->f_path.dentry->d_inode; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2165 | char *p = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2166 | ssize_t length; |
| 2167 | struct task_struct *task = get_proc_task(inode); |
| 2168 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2169 | if (!task) |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2170 | return -ESRCH; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2171 | |
| 2172 | length = security_getprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2173 | (char*)file->f_path.dentry->d_name.name, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2174 | &p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2175 | put_task_struct(task); |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2176 | if (length > 0) |
| 2177 | length = simple_read_from_buffer(buf, count, ppos, p, length); |
| 2178 | kfree(p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2179 | return length; |
| 2180 | } |
| 2181 | |
| 2182 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| 2183 | size_t count, loff_t *ppos) |
| 2184 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2185 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2186 | char *page; |
| 2187 | ssize_t length; |
| 2188 | struct task_struct *task = get_proc_task(inode); |
| 2189 | |
| 2190 | length = -ESRCH; |
| 2191 | if (!task) |
| 2192 | goto out_no_task; |
| 2193 | if (count > PAGE_SIZE) |
| 2194 | count = PAGE_SIZE; |
| 2195 | |
| 2196 | /* No partial writes. */ |
| 2197 | length = -EINVAL; |
| 2198 | if (*ppos != 0) |
| 2199 | goto out; |
| 2200 | |
| 2201 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 2202 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2203 | if (!page) |
| 2204 | goto out; |
| 2205 | |
| 2206 | length = -EFAULT; |
| 2207 | if (copy_from_user(page, buf, count)) |
| 2208 | goto out_free; |
| 2209 | |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2210 | /* Guard against adverse ptrace interaction */ |
| 2211 | length = mutex_lock_interruptible(&task->cred_guard_mutex); |
| 2212 | if (length < 0) |
| 2213 | goto out_free; |
| 2214 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2215 | length = security_setprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2216 | (char*)file->f_path.dentry->d_name.name, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2217 | (void*)page, count); |
David Howells | 107db7c | 2009-05-08 13:55:27 +0100 | [diff] [blame] | 2218 | mutex_unlock(&task->cred_guard_mutex); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2219 | out_free: |
| 2220 | free_page((unsigned long) page); |
| 2221 | out: |
| 2222 | put_task_struct(task); |
| 2223 | out_no_task: |
| 2224 | return length; |
| 2225 | } |
| 2226 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2227 | static const struct file_operations proc_pid_attr_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2228 | .read = proc_pid_attr_read, |
| 2229 | .write = proc_pid_attr_write, |
| 2230 | }; |
| 2231 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2232 | static const struct pid_entry attr_dir_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2233 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2234 | REG("prev", S_IRUGO, proc_pid_attr_operations), |
| 2235 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2236 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2237 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2238 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2239 | }; |
| 2240 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2241 | static int proc_attr_dir_readdir(struct file * filp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | void * dirent, filldir_t filldir) |
| 2243 | { |
| 2244 | return proc_pident_readdir(filp,dirent,filldir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2245 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | } |
| 2247 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2248 | static const struct file_operations proc_attr_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | .read = generic_read_dir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2250 | .readdir = proc_attr_dir_readdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | }; |
| 2252 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2253 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2254 | struct dentry *dentry, struct nameidata *nd) |
| 2255 | { |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2256 | return proc_pident_lookup(dir, dentry, |
| 2257 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | } |
| 2259 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2260 | static const struct inode_operations proc_attr_dir_inode_operations = { |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2261 | .lookup = proc_attr_dir_lookup, |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2262 | .getattr = pid_getattr, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2263 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | }; |
| 2265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | #endif |
| 2267 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2268 | #ifdef CONFIG_ELF_CORE |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2269 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
| 2270 | size_t count, loff_t *ppos) |
| 2271 | { |
| 2272 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 2273 | struct mm_struct *mm; |
| 2274 | char buffer[PROC_NUMBUF]; |
| 2275 | size_t len; |
| 2276 | int ret; |
| 2277 | |
| 2278 | if (!task) |
| 2279 | return -ESRCH; |
| 2280 | |
| 2281 | ret = 0; |
| 2282 | mm = get_task_mm(task); |
| 2283 | if (mm) { |
| 2284 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", |
| 2285 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> |
| 2286 | MMF_DUMP_FILTER_SHIFT)); |
| 2287 | mmput(mm); |
| 2288 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 2289 | } |
| 2290 | |
| 2291 | put_task_struct(task); |
| 2292 | |
| 2293 | return ret; |
| 2294 | } |
| 2295 | |
| 2296 | static ssize_t proc_coredump_filter_write(struct file *file, |
| 2297 | const char __user *buf, |
| 2298 | size_t count, |
| 2299 | loff_t *ppos) |
| 2300 | { |
| 2301 | struct task_struct *task; |
| 2302 | struct mm_struct *mm; |
| 2303 | char buffer[PROC_NUMBUF], *end; |
| 2304 | unsigned int val; |
| 2305 | int ret; |
| 2306 | int i; |
| 2307 | unsigned long mask; |
| 2308 | |
| 2309 | ret = -EFAULT; |
| 2310 | memset(buffer, 0, sizeof(buffer)); |
| 2311 | if (count > sizeof(buffer) - 1) |
| 2312 | count = sizeof(buffer) - 1; |
| 2313 | if (copy_from_user(buffer, buf, count)) |
| 2314 | goto out_no_task; |
| 2315 | |
| 2316 | ret = -EINVAL; |
| 2317 | val = (unsigned int)simple_strtoul(buffer, &end, 0); |
| 2318 | if (*end == '\n') |
| 2319 | end++; |
| 2320 | if (end - buffer == 0) |
| 2321 | goto out_no_task; |
| 2322 | |
| 2323 | ret = -ESRCH; |
| 2324 | task = get_proc_task(file->f_dentry->d_inode); |
| 2325 | if (!task) |
| 2326 | goto out_no_task; |
| 2327 | |
| 2328 | ret = end - buffer; |
| 2329 | mm = get_task_mm(task); |
| 2330 | if (!mm) |
| 2331 | goto out_no_mm; |
| 2332 | |
| 2333 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { |
| 2334 | if (val & mask) |
| 2335 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2336 | else |
| 2337 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2338 | } |
| 2339 | |
| 2340 | mmput(mm); |
| 2341 | out_no_mm: |
| 2342 | put_task_struct(task); |
| 2343 | out_no_task: |
| 2344 | return ret; |
| 2345 | } |
| 2346 | |
| 2347 | static const struct file_operations proc_coredump_filter_operations = { |
| 2348 | .read = proc_coredump_filter_read, |
| 2349 | .write = proc_coredump_filter_write, |
| 2350 | }; |
| 2351 | #endif |
| 2352 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | /* |
| 2354 | * /proc/self: |
| 2355 | */ |
| 2356 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| 2357 | int buflen) |
| 2358 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2359 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2360 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2361 | char tmp[PROC_NUMBUF]; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2362 | if (!tgid) |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2363 | return -ENOENT; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2364 | sprintf(tmp, "%d", tgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | return vfs_readlink(dentry,buffer,buflen,tmp); |
| 2366 | } |
| 2367 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 2368 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2370 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2371 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame^] | 2372 | char *name = ERR_PTR(-ENOENT); |
| 2373 | if (tgid) { |
| 2374 | name = __getname(); |
| 2375 | if (!name) |
| 2376 | name = ERR_PTR(-ENOMEM); |
| 2377 | else |
| 2378 | sprintf(name, "%d", tgid); |
| 2379 | } |
| 2380 | nd_set_link(nd, name); |
| 2381 | return NULL; |
| 2382 | } |
| 2383 | |
| 2384 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, |
| 2385 | void *cookie) |
| 2386 | { |
| 2387 | char *s = nd_get_link(nd); |
| 2388 | if (!IS_ERR(s)) |
| 2389 | __putname(s); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2390 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2392 | static const struct inode_operations proc_self_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | .readlink = proc_self_readlink, |
| 2394 | .follow_link = proc_self_follow_link, |
Al Viro | 7fee486 | 2010-01-14 01:03:28 -0500 | [diff] [blame^] | 2395 | .put_link = proc_self_put_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | }; |
| 2397 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2398 | /* |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2399 | * proc base |
| 2400 | * |
| 2401 | * These are the directory entries in the root directory of /proc |
| 2402 | * that properly belong to the /proc filesystem, as they describe |
| 2403 | * describe something that is process related. |
| 2404 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2405 | static const struct pid_entry proc_base_stuff[] = { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2406 | NOD("self", S_IFLNK|S_IRWXUGO, |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2407 | &proc_self_inode_operations, NULL, {}), |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2408 | }; |
| 2409 | |
| 2410 | /* |
| 2411 | * Exceptional case: normally we are not allowed to unhash a busy |
| 2412 | * directory. In this case, however, we can do it - no aliasing problems |
| 2413 | * due to the way we treat inodes. |
| 2414 | */ |
| 2415 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 2416 | { |
| 2417 | struct inode *inode = dentry->d_inode; |
| 2418 | struct task_struct *task = get_proc_task(inode); |
| 2419 | if (task) { |
| 2420 | put_task_struct(task); |
| 2421 | return 1; |
| 2422 | } |
| 2423 | d_drop(dentry); |
| 2424 | return 0; |
| 2425 | } |
| 2426 | |
Al Viro | d72f71e | 2009-02-20 05:58:47 +0000 | [diff] [blame] | 2427 | static const struct dentry_operations proc_base_dentry_operations = |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2428 | { |
| 2429 | .d_revalidate = proc_base_revalidate, |
| 2430 | .d_delete = pid_delete_dentry, |
| 2431 | }; |
| 2432 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2433 | static struct dentry *proc_base_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2434 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2435 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2436 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2437 | struct inode *inode; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2438 | struct proc_inode *ei; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2439 | struct dentry *error = ERR_PTR(-EINVAL); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2440 | |
| 2441 | /* Allocate the inode */ |
| 2442 | error = ERR_PTR(-ENOMEM); |
| 2443 | inode = new_inode(dir->i_sb); |
| 2444 | if (!inode) |
| 2445 | goto out; |
| 2446 | |
| 2447 | /* Initialize the inode */ |
| 2448 | ei = PROC_I(inode); |
| 2449 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2450 | |
| 2451 | /* |
| 2452 | * grab the reference to the task. |
| 2453 | */ |
Oleg Nesterov | 1a657f78 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 2454 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2455 | if (!ei->pid) |
| 2456 | goto out_iput; |
| 2457 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2458 | inode->i_mode = p->mode; |
| 2459 | if (S_ISDIR(inode->i_mode)) |
| 2460 | inode->i_nlink = 2; |
| 2461 | if (S_ISLNK(inode->i_mode)) |
| 2462 | inode->i_size = 64; |
| 2463 | if (p->iop) |
| 2464 | inode->i_op = p->iop; |
| 2465 | if (p->fop) |
| 2466 | inode->i_fop = p->fop; |
| 2467 | ei->op = p->op; |
| 2468 | dentry->d_op = &proc_base_dentry_operations; |
| 2469 | d_add(dentry, inode); |
| 2470 | error = NULL; |
| 2471 | out: |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2472 | return error; |
| 2473 | out_iput: |
| 2474 | iput(inode); |
| 2475 | goto out; |
| 2476 | } |
| 2477 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2478 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
| 2479 | { |
| 2480 | struct dentry *error; |
| 2481 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2482 | const struct pid_entry *p, *last; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2483 | |
| 2484 | error = ERR_PTR(-ENOENT); |
| 2485 | |
| 2486 | if (!task) |
| 2487 | goto out_no_task; |
| 2488 | |
| 2489 | /* Lookup the directory entry */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2490 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
| 2491 | for (p = proc_base_stuff; p <= last; p++) { |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2492 | if (p->len != dentry->d_name.len) |
| 2493 | continue; |
| 2494 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2495 | break; |
| 2496 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2497 | if (p > last) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2498 | goto out; |
| 2499 | |
| 2500 | error = proc_base_instantiate(dir, dentry, task, p); |
| 2501 | |
| 2502 | out: |
| 2503 | put_task_struct(task); |
| 2504 | out_no_task: |
| 2505 | return error; |
| 2506 | } |
| 2507 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2508 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
| 2509 | 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] | 2510 | { |
| 2511 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2512 | proc_base_instantiate, task, p); |
| 2513 | } |
| 2514 | |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2515 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2516 | 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] | 2517 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2518 | struct task_io_accounting acct = task->ioac; |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2519 | unsigned long flags; |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2520 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2521 | if (whole && lock_task_sighand(task, &flags)) { |
| 2522 | struct task_struct *t = task; |
Andrea Righi | b2d002d | 2008-07-26 15:22:27 -0700 | [diff] [blame] | 2523 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2524 | task_io_accounting_add(&acct, &task->signal->ioac); |
| 2525 | while_each_thread(task, t) |
| 2526 | task_io_accounting_add(&acct, &t->ioac); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2527 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2528 | unlock_task_sighand(task, &flags); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2529 | } |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2530 | return sprintf(buffer, |
| 2531 | "rchar: %llu\n" |
| 2532 | "wchar: %llu\n" |
| 2533 | "syscr: %llu\n" |
| 2534 | "syscw: %llu\n" |
| 2535 | "read_bytes: %llu\n" |
| 2536 | "write_bytes: %llu\n" |
| 2537 | "cancelled_write_bytes: %llu\n", |
Alexander Beregalov | 7c44319 | 2008-08-05 13:01:34 -0700 | [diff] [blame] | 2538 | (unsigned long long)acct.rchar, |
| 2539 | (unsigned long long)acct.wchar, |
| 2540 | (unsigned long long)acct.syscr, |
| 2541 | (unsigned long long)acct.syscw, |
| 2542 | (unsigned long long)acct.read_bytes, |
| 2543 | (unsigned long long)acct.write_bytes, |
| 2544 | (unsigned long long)acct.cancelled_write_bytes); |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2545 | } |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2546 | |
| 2547 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) |
| 2548 | { |
| 2549 | return do_io_accounting(task, buffer, 0); |
| 2550 | } |
| 2551 | |
| 2552 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) |
| 2553 | { |
| 2554 | return do_io_accounting(task, buffer, 1); |
| 2555 | } |
| 2556 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2557 | |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2558 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
| 2559 | struct pid *pid, struct task_struct *task) |
| 2560 | { |
| 2561 | seq_printf(m, "%08x\n", task->personality); |
| 2562 | return 0; |
| 2563 | } |
| 2564 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2565 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2566 | * Thread groups |
| 2567 | */ |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2568 | static const struct file_operations proc_task_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2569 | static const struct inode_operations proc_task_inode_operations; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2570 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2571 | static const struct pid_entry tgid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2572 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
| 2573 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2574 | 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] | 2575 | #ifdef CONFIG_NET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2576 | 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] | 2577 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2578 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2579 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2580 | ONE("status", S_IRUGO, proc_pid_status), |
| 2581 | ONE("personality", S_IRUSR, proc_pid_personality), |
| 2582 | INF("limits", S_IRUSR, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2583 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2584 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2585 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 2586 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2587 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2588 | INF("syscall", S_IRUSR, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2589 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2590 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2591 | ONE("stat", S_IRUGO, proc_tgid_stat), |
| 2592 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2593 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2594 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2595 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2596 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2597 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2598 | LNK("cwd", proc_cwd_link), |
| 2599 | LNK("root", proc_root_link), |
| 2600 | LNK("exe", proc_exe_link), |
| 2601 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2602 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
| 2603 | REG("mountstats", S_IRUSR, proc_mountstats_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2604 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2605 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2606 | REG("smaps", S_IRUGO, proc_smaps_operations), |
| 2607 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2608 | #endif |
| 2609 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2610 | 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] | 2611 | #endif |
| 2612 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2613 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2614 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2615 | #ifdef CONFIG_STACKTRACE |
| 2616 | ONE("stack", S_IRUSR, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2617 | #endif |
| 2618 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2619 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2620 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2621 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2622 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2623 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2624 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2625 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2626 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2627 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2628 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2629 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2630 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2631 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2632 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2633 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2634 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2635 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2636 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2637 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2638 | #endif |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 2639 | #ifdef CONFIG_ELF_CORE |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2640 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2641 | #endif |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2642 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2643 | INF("io", S_IRUGO, proc_tgid_io_accounting), |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2644 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2645 | }; |
| 2646 | |
| 2647 | static int proc_tgid_base_readdir(struct file * filp, |
| 2648 | void * dirent, filldir_t filldir) |
| 2649 | { |
| 2650 | return proc_pident_readdir(filp,dirent,filldir, |
| 2651 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
| 2652 | } |
| 2653 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2654 | static const struct file_operations proc_tgid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2655 | .read = generic_read_dir, |
| 2656 | .readdir = proc_tgid_base_readdir, |
| 2657 | }; |
| 2658 | |
| 2659 | 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] | 2660 | return proc_pident_lookup(dir, dentry, |
| 2661 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2662 | } |
| 2663 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2664 | static const struct inode_operations proc_tgid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2665 | .lookup = proc_tgid_base_lookup, |
| 2666 | .getattr = pid_getattr, |
| 2667 | .setattr = proc_setattr, |
| 2668 | }; |
| 2669 | |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2670 | 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] | 2671 | { |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2672 | struct dentry *dentry, *leader, *dir; |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2673 | char buf[PROC_NUMBUF]; |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2674 | struct qstr name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2676 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2677 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| 2678 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2679 | if (dentry) { |
Sukadev Bhattiprolu | 29f12ca | 2009-11-11 14:26:32 -0800 | [diff] [blame] | 2680 | shrink_dcache_parent(dentry); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2681 | d_drop(dentry); |
| 2682 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2685 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2686 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
| 2687 | leader = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2688 | if (!leader) |
| 2689 | goto out; |
| 2690 | |
| 2691 | name.name = "task"; |
| 2692 | name.len = strlen(name.name); |
| 2693 | dir = d_hash_and_lookup(leader, &name); |
| 2694 | if (!dir) |
| 2695 | goto out_put_leader; |
| 2696 | |
| 2697 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2698 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2699 | dentry = d_hash_and_lookup(dir, &name); |
| 2700 | if (dentry) { |
| 2701 | shrink_dcache_parent(dentry); |
| 2702 | d_drop(dentry); |
| 2703 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | } |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2705 | |
| 2706 | dput(dir); |
| 2707 | out_put_leader: |
| 2708 | dput(leader); |
| 2709 | out: |
| 2710 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2711 | } |
| 2712 | |
Randy Dunlap | 0895e91 | 2007-10-21 21:00:10 -0700 | [diff] [blame] | 2713 | /** |
| 2714 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| 2715 | * @task: task that should be flushed. |
| 2716 | * |
| 2717 | * When flushing dentries from proc, one needs to flush them from global |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2718 | * 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] | 2719 | * in. This call is supposed to do all of this job. |
| 2720 | * |
| 2721 | * Looks in the dcache for |
| 2722 | * /proc/@pid |
| 2723 | * /proc/@tgid/task/@pid |
| 2724 | * if either directory is present flushes it and all of it'ts children |
| 2725 | * from the dcache. |
| 2726 | * |
| 2727 | * It is safe and reasonable to cache /proc entries for a task until |
| 2728 | * that task exits. After that they just clog up the dcache with |
| 2729 | * useless entries, possibly causing useful dcache entries to be |
| 2730 | * flushed instead. This routine is proved to flush those useless |
| 2731 | * dcache entries at process exit time. |
| 2732 | * |
| 2733 | * NOTE: This routine is just an optimization so it does not guarantee |
| 2734 | * that no dcache entries will exist at process exit time it |
| 2735 | * just makes it very unlikely that any will persist. |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2736 | */ |
| 2737 | |
| 2738 | void proc_flush_task(struct task_struct *task) |
| 2739 | { |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2740 | int i; |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2741 | struct pid *pid, *tgid; |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2742 | struct upid *upid; |
| 2743 | |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2744 | pid = task_pid(task); |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2745 | tgid = task_tgid(task); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2746 | |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2747 | for (i = 0; i <= pid->level; i++) { |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2748 | upid = &pid->numbers[i]; |
| 2749 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, |
Oleg Nesterov | 9b4d1cbe | 2009-09-22 16:45:34 -0700 | [diff] [blame] | 2750 | tgid->numbers[i].nr); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2751 | } |
Pavel Emelyanov | 6f4e643 | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2752 | |
| 2753 | upid = &pid->numbers[pid->level]; |
| 2754 | if (upid->nr == 1) |
| 2755 | pid_ns_release_proc(upid->ns); |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2756 | } |
| 2757 | |
Adrian Bunk | 9711ef9 | 2006-12-06 20:38:31 -0800 | [diff] [blame] | 2758 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
| 2759 | struct dentry * dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2760 | struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2761 | { |
| 2762 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2763 | struct inode *inode; |
| 2764 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2765 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2766 | if (!inode) |
| 2767 | goto out; |
| 2768 | |
| 2769 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 2770 | inode->i_op = &proc_tgid_base_inode_operations; |
| 2771 | inode->i_fop = &proc_tgid_base_operations; |
| 2772 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 2773 | |
| 2774 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, |
| 2775 | ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2776 | |
| 2777 | dentry->d_op = &pid_dentry_operations; |
| 2778 | |
| 2779 | d_add(dentry, inode); |
| 2780 | /* Close the race of the process dying before we return the dentry */ |
| 2781 | if (pid_revalidate(dentry, NULL)) |
| 2782 | error = NULL; |
| 2783 | out: |
| 2784 | return error; |
| 2785 | } |
| 2786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 2788 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2789 | struct dentry *result = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2790 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | unsigned tgid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2792 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2794 | result = proc_base_lookup(dir, dentry); |
| 2795 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) |
| 2796 | goto out; |
| 2797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2798 | tgid = name_to_int(dentry); |
| 2799 | if (tgid == ~0U) |
| 2800 | goto out; |
| 2801 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2802 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2803 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2804 | task = find_task_by_pid_ns(tgid, ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | if (task) |
| 2806 | get_task_struct(task); |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2807 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2808 | if (!task) |
| 2809 | goto out; |
| 2810 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2811 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2812 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2813 | out: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2814 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2815 | } |
| 2816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | /* |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2818 | * Find the first task with tgid >= tgid |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2819 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2820 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2821 | struct tgid_iter { |
| 2822 | unsigned int tgid; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2823 | struct task_struct *task; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2824 | }; |
| 2825 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) |
| 2826 | { |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2827 | struct pid *pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2828 | |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2829 | if (iter.task) |
| 2830 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2831 | rcu_read_lock(); |
| 2832 | retry: |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2833 | iter.task = NULL; |
| 2834 | pid = find_ge_pid(iter.tgid, ns); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2835 | if (pid) { |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2836 | iter.tgid = pid_nr_ns(pid, ns); |
| 2837 | iter.task = pid_task(pid, PIDTYPE_PID); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2838 | /* What we to know is if the pid we have find is the |
| 2839 | * pid of a thread_group_leader. Testing for task |
| 2840 | * being a thread_group_leader is the obvious thing |
| 2841 | * todo but there is a window when it fails, due to |
| 2842 | * the pid transfer logic in de_thread. |
| 2843 | * |
| 2844 | * So we perform the straight forward test of seeing |
| 2845 | * if the pid we have found is the pid of a thread |
| 2846 | * group leader, and don't worry if the task we have |
| 2847 | * found doesn't happen to be a thread group leader. |
| 2848 | * As we don't care in the case of readdir. |
| 2849 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2850 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
| 2851 | iter.tgid += 1; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2852 | goto retry; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2853 | } |
| 2854 | get_task_struct(iter.task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2855 | } |
Eric W. Biederman | 454cc10 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2856 | rcu_read_unlock(); |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2857 | return iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2858 | } |
| 2859 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2860 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2861 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2862 | 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] | 2863 | struct tgid_iter iter) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2864 | { |
| 2865 | char name[PROC_NUMBUF]; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2866 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2867 | return proc_fill_cache(filp, dirent, filldir, name, len, |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2868 | proc_pid_instantiate, iter.task, NULL); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2869 | } |
| 2870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2871 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
| 2872 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 2873 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2874 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2875 | 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] | 2876 | struct tgid_iter iter; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2877 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2878 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2879 | if (!reaper) |
| 2880 | goto out_no_task; |
| 2881 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2882 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2883 | const struct pid_entry *p = &proc_base_stuff[nr]; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2884 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2885 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | } |
| 2887 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2888 | ns = filp->f_dentry->d_sb->s_fs_info; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2889 | iter.task = NULL; |
| 2890 | iter.tgid = filp->f_pos - TGID_OFFSET; |
| 2891 | for (iter = next_tgid(ns, iter); |
| 2892 | iter.task; |
| 2893 | iter.tgid += 1, iter = next_tgid(ns, iter)) { |
| 2894 | filp->f_pos = iter.tgid + TGID_OFFSET; |
| 2895 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { |
| 2896 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2897 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2898 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2899 | } |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2900 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
| 2901 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2902 | put_task_struct(reaper); |
| 2903 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2904 | return 0; |
| 2905 | } |
| 2906 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2907 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2908 | * Tasks |
| 2909 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2910 | static const struct pid_entry tid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2911 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2912 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fd_operations), |
| 2913 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2914 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2915 | ONE("status", S_IRUGO, proc_pid_status), |
| 2916 | ONE("personality", S_IRUSR, proc_pid_personality), |
| 2917 | INF("limits", S_IRUSR, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2918 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2919 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2920 | #endif |
john stultz | 4614a696b | 2009-12-14 18:00:05 -0800 | [diff] [blame] | 2921 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2922 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2923 | INF("syscall", S_IRUSR, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2924 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2925 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2926 | ONE("stat", S_IRUGO, proc_tid_stat), |
| 2927 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2928 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2929 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2930 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2931 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2932 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2933 | LNK("cwd", proc_cwd_link), |
| 2934 | LNK("root", proc_root_link), |
| 2935 | LNK("exe", proc_exe_link), |
| 2936 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2937 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2938 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2939 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2940 | REG("smaps", S_IRUGO, proc_smaps_operations), |
| 2941 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2942 | #endif |
| 2943 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2944 | 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] | 2945 | #endif |
| 2946 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2947 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2948 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2949 | #ifdef CONFIG_STACKTRACE |
| 2950 | ONE("stack", S_IRUSR, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2951 | #endif |
| 2952 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2953 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2954 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2955 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2956 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2957 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2958 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2959 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2960 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2961 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2962 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2963 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2964 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2965 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2966 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2967 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2968 | REG("sessionid", S_IRUSR, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2969 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2970 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2971 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2972 | #endif |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2973 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2974 | INF("io", S_IRUGO, proc_tid_io_accounting), |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2975 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2976 | }; |
| 2977 | |
| 2978 | static int proc_tid_base_readdir(struct file * filp, |
| 2979 | void * dirent, filldir_t filldir) |
| 2980 | { |
| 2981 | return proc_pident_readdir(filp,dirent,filldir, |
| 2982 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); |
| 2983 | } |
| 2984 | |
| 2985 | 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] | 2986 | return proc_pident_lookup(dir, dentry, |
| 2987 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2988 | } |
| 2989 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2990 | static const struct file_operations proc_tid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2991 | .read = generic_read_dir, |
| 2992 | .readdir = proc_tid_base_readdir, |
| 2993 | }; |
| 2994 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2995 | static const struct inode_operations proc_tid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2996 | .lookup = proc_tid_base_lookup, |
| 2997 | .getattr = pid_getattr, |
| 2998 | .setattr = proc_setattr, |
| 2999 | }; |
| 3000 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3001 | static struct dentry *proc_task_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 3002 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3003 | { |
| 3004 | struct dentry *error = ERR_PTR(-ENOENT); |
| 3005 | struct inode *inode; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3006 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3007 | |
| 3008 | if (!inode) |
| 3009 | goto out; |
| 3010 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 3011 | inode->i_op = &proc_tid_base_inode_operations; |
| 3012 | inode->i_fop = &proc_tid_base_operations; |
| 3013 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 3014 | |
| 3015 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, |
| 3016 | ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3017 | |
| 3018 | dentry->d_op = &pid_dentry_operations; |
| 3019 | |
| 3020 | d_add(dentry, inode); |
| 3021 | /* Close the race of the process dying before we return the dentry */ |
| 3022 | if (pid_revalidate(dentry, NULL)) |
| 3023 | error = NULL; |
| 3024 | out: |
| 3025 | return error; |
| 3026 | } |
| 3027 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3028 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 3029 | { |
| 3030 | struct dentry *result = ERR_PTR(-ENOENT); |
| 3031 | struct task_struct *task; |
| 3032 | struct task_struct *leader = get_proc_task(dir); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3033 | unsigned tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3034 | struct pid_namespace *ns; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3035 | |
| 3036 | if (!leader) |
| 3037 | goto out_no_task; |
| 3038 | |
| 3039 | tid = name_to_int(dentry); |
| 3040 | if (tid == ~0U) |
| 3041 | goto out; |
| 3042 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3043 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3044 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3045 | task = find_task_by_pid_ns(tid, ns); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3046 | if (task) |
| 3047 | get_task_struct(task); |
| 3048 | rcu_read_unlock(); |
| 3049 | if (!task) |
| 3050 | goto out; |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 3051 | if (!same_thread_group(leader, task)) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3052 | goto out_drop_task; |
| 3053 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3054 | result = proc_task_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3055 | out_drop_task: |
| 3056 | put_task_struct(task); |
| 3057 | out: |
| 3058 | put_task_struct(leader); |
| 3059 | out_no_task: |
| 3060 | return result; |
| 3061 | } |
| 3062 | |
| 3063 | /* |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3064 | * Find the first tid of a thread group to return to user space. |
| 3065 | * |
| 3066 | * Usually this is just the thread group leader, but if the users |
| 3067 | * buffer was too small or there was a seek into the middle of the |
| 3068 | * directory we have more work todo. |
| 3069 | * |
| 3070 | * In the case of a short read we start with find_task_by_pid. |
| 3071 | * |
| 3072 | * In the case of a seek we start with the leader and walk nr |
| 3073 | * threads past it. |
| 3074 | */ |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3075 | static struct task_struct *first_tid(struct task_struct *leader, |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3076 | int tid, int nr, struct pid_namespace *ns) |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3077 | { |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3078 | struct task_struct *pos; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3079 | |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3080 | rcu_read_lock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3081 | /* Attempt to start with the pid of a thread */ |
| 3082 | if (tid && (nr > 0)) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3083 | pos = find_task_by_pid_ns(tid, ns); |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3084 | if (pos && (pos->group_leader == leader)) |
| 3085 | goto found; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3086 | } |
| 3087 | |
| 3088 | /* If nr exceeds the number of threads there is nothing todo */ |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3089 | pos = NULL; |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3090 | if (nr && nr >= get_nr_threads(leader)) |
| 3091 | goto out; |
| 3092 | |
| 3093 | /* If we haven't found our starting place yet start |
| 3094 | * with the leader and walk nr threads forward. |
| 3095 | */ |
| 3096 | for (pos = leader; nr > 0; --nr) { |
| 3097 | pos = next_thread(pos); |
| 3098 | if (pos == leader) { |
| 3099 | pos = NULL; |
| 3100 | goto out; |
| 3101 | } |
| 3102 | } |
| 3103 | found: |
| 3104 | get_task_struct(pos); |
| 3105 | out: |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3106 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3107 | return pos; |
| 3108 | } |
| 3109 | |
| 3110 | /* |
| 3111 | * Find the next thread in the thread list. |
| 3112 | * Return NULL if there is an error or no next thread. |
| 3113 | * |
| 3114 | * The reference to the input task_struct is released. |
| 3115 | */ |
| 3116 | static struct task_struct *next_tid(struct task_struct *start) |
| 3117 | { |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3118 | struct task_struct *pos = NULL; |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3119 | rcu_read_lock(); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3120 | if (pid_alive(start)) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3121 | pos = next_thread(start); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3122 | if (thread_group_leader(pos)) |
| 3123 | pos = NULL; |
| 3124 | else |
| 3125 | get_task_struct(pos); |
| 3126 | } |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3127 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3128 | put_task_struct(start); |
| 3129 | return pos; |
| 3130 | } |
| 3131 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3132 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 3133 | struct task_struct *task, int tid) |
| 3134 | { |
| 3135 | char name[PROC_NUMBUF]; |
| 3136 | int len = snprintf(name, sizeof(name), "%d", tid); |
| 3137 | return proc_fill_cache(filp, dirent, filldir, name, len, |
| 3138 | proc_task_instantiate, task, NULL); |
| 3139 | } |
| 3140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3141 | /* for the /proc/TGID/task/ directories */ |
| 3142 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3143 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 3144 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3145 | struct inode *inode = dentry->d_inode; |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3146 | struct task_struct *leader = NULL; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3147 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3148 | int retval = -ENOENT; |
| 3149 | ino_t ino; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3150 | int tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3151 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3152 | |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3153 | task = get_proc_task(inode); |
| 3154 | if (!task) |
| 3155 | goto out_no_task; |
| 3156 | rcu_read_lock(); |
| 3157 | if (pid_alive(task)) { |
| 3158 | leader = task->group_leader; |
| 3159 | get_task_struct(leader); |
| 3160 | } |
| 3161 | rcu_read_unlock(); |
| 3162 | put_task_struct(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3163 | if (!leader) |
| 3164 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3165 | retval = 0; |
| 3166 | |
Linus Torvalds | ee568b2 | 2009-03-17 10:02:35 -0700 | [diff] [blame] | 3167 | switch ((unsigned long)filp->f_pos) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3168 | case 0: |
| 3169 | ino = inode->i_ino; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3170 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3171 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3172 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3173 | /* fall through */ |
| 3174 | case 1: |
| 3175 | ino = parent_ino(dentry); |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3176 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3177 | goto out; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3178 | filp->f_pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3179 | /* fall through */ |
| 3180 | } |
| 3181 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3182 | /* f_version caches the tgid value that the last readdir call couldn't |
| 3183 | * return. lseek aka telldir automagically resets f_version to 0. |
| 3184 | */ |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3185 | ns = filp->f_dentry->d_sb->s_fs_info; |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3186 | tid = (int)filp->f_version; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3187 | filp->f_version = 0; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3188 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3189 | task; |
Zhang Le | ee6f779 | 2009-03-16 14:44:31 +0800 | [diff] [blame] | 3190 | task = next_tid(task), filp->f_pos++) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3191 | tid = task_pid_nr_ns(task, ns); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3192 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3193 | /* returning this tgid failed, save it as the first |
| 3194 | * pid for the next readir call */ |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3195 | filp->f_version = (u64)tid; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3196 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3197 | break; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3198 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3199 | } |
| 3200 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3201 | put_task_struct(leader); |
| 3202 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3203 | return retval; |
| 3204 | } |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3205 | |
| 3206 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 3207 | { |
| 3208 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3209 | struct task_struct *p = get_proc_task(inode); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3210 | generic_fillattr(inode, stat); |
| 3211 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3212 | if (p) { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3213 | stat->nlink += get_nr_threads(p); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3214 | put_task_struct(p); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3215 | } |
| 3216 | |
| 3217 | return 0; |
| 3218 | } |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3219 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3220 | static const struct inode_operations proc_task_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3221 | .lookup = proc_task_lookup, |
| 3222 | .getattr = proc_task_getattr, |
| 3223 | .setattr = proc_setattr, |
| 3224 | }; |
| 3225 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3226 | static const struct file_operations proc_task_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3227 | .read = generic_read_dir, |
| 3228 | .readdir = proc_task_readdir, |
| 3229 | }; |