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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #include "internal.h" |
| 84 | |
Eric W. Biederman | 0f2fe20 | 2006-06-26 00:25:46 -0700 | [diff] [blame] | 85 | /* NOTE: |
| 86 | * Implementing inode permission operations in /proc is almost |
| 87 | * certainly an error. Permission checks need to happen during |
| 88 | * each system call not at open time. The reason is that most of |
| 89 | * what we wish to check for permissions in /proc varies at runtime. |
| 90 | * |
| 91 | * The classic example of a problem is opening file descriptors |
| 92 | * in /proc for a task before it execs a suid executable. |
| 93 | */ |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | struct pid_entry { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | char *name; |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 97 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | mode_t mode; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 99 | const struct inode_operations *iop; |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 100 | const struct file_operations *fop; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 101 | union proc_op op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | }; |
| 103 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 104 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 105 | .name = (NAME), \ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 106 | .len = sizeof(NAME) - 1, \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 107 | .mode = MODE, \ |
| 108 | .iop = IOP, \ |
| 109 | .fop = FOP, \ |
| 110 | .op = OP, \ |
| 111 | } |
| 112 | |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 113 | #define DIR(NAME, MODE, iops, fops) \ |
| 114 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) |
| 115 | #define LNK(NAME, get_link) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 116 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 117 | &proc_pid_link_inode_operations, NULL, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 118 | { .proc_get_link = get_link } ) |
| 119 | #define REG(NAME, MODE, fops) \ |
| 120 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) |
| 121 | #define INF(NAME, MODE, read) \ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 122 | NOD(NAME, (S_IFREG|(MODE)), \ |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 123 | NULL, &proc_info_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 124 | { .proc_read = read } ) |
| 125 | #define ONE(NAME, MODE, show) \ |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 126 | NOD(NAME, (S_IFREG|(MODE)), \ |
| 127 | NULL, &proc_single_file_operations, \ |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 128 | { .proc_show = show } ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 130 | /* |
| 131 | * Count the number of hardlinks for the pid_entry table, excluding the . |
| 132 | * and .. links. |
| 133 | */ |
| 134 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, |
| 135 | unsigned int n) |
| 136 | { |
| 137 | unsigned int i; |
| 138 | unsigned int count; |
| 139 | |
| 140 | count = 0; |
| 141 | for (i = 0; i < n; ++i) { |
| 142 | if (S_ISDIR(entries[i].mode)) |
| 143 | ++count; |
| 144 | } |
| 145 | |
| 146 | return count; |
| 147 | } |
| 148 | |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 149 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
| 151 | struct fs_struct *fs; |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 152 | task_lock(task); |
| 153 | fs = task->fs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | if(fs) |
| 155 | atomic_inc(&fs->count); |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 156 | task_unlock(task); |
| 157 | return fs; |
| 158 | } |
| 159 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 160 | static int get_nr_threads(struct task_struct *tsk) |
| 161 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 162 | unsigned long flags; |
| 163 | int count = 0; |
| 164 | |
| 165 | if (lock_task_sighand(tsk, &flags)) { |
| 166 | count = atomic_read(&tsk->signal->count); |
| 167 | unlock_task_sighand(tsk, &flags); |
| 168 | } |
| 169 | return count; |
| 170 | } |
| 171 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 172 | static int proc_cwd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 173 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 174 | struct task_struct *task = get_proc_task(inode); |
| 175 | struct fs_struct *fs = NULL; |
Miklos Szeredi | 0494f6e | 2005-09-06 15:18:22 -0700 | [diff] [blame] | 176 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 177 | |
| 178 | if (task) { |
| 179 | fs = get_fs_struct(task); |
| 180 | put_task_struct(task); |
| 181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (fs) { |
| 183 | read_lock(&fs->lock); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 184 | *path = fs->pwd; |
| 185 | path_get(&fs->pwd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | read_unlock(&fs->lock); |
| 187 | result = 0; |
| 188 | put_fs_struct(fs); |
| 189 | } |
| 190 | return result; |
| 191 | } |
| 192 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 193 | static int proc_root_link(struct inode *inode, struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 195 | struct task_struct *task = get_proc_task(inode); |
| 196 | struct fs_struct *fs = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | int result = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 198 | |
| 199 | if (task) { |
| 200 | fs = get_fs_struct(task); |
| 201 | put_task_struct(task); |
| 202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | if (fs) { |
| 204 | read_lock(&fs->lock); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 205 | *path = fs->root; |
| 206 | path_get(&fs->root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | read_unlock(&fs->lock); |
| 208 | result = 0; |
| 209 | put_fs_struct(fs); |
| 210 | } |
| 211 | return result; |
| 212 | } |
| 213 | |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 214 | /* |
| 215 | * Return zero if current may access user memory in @task, -error if not. |
| 216 | */ |
| 217 | static int check_mem_permission(struct task_struct *task) |
| 218 | { |
| 219 | /* |
| 220 | * A task can always look at itself, in case it chooses |
| 221 | * to use system calls instead of load instructions. |
| 222 | */ |
| 223 | if (task == current) |
| 224 | return 0; |
| 225 | |
| 226 | /* |
| 227 | * If current is actively ptrace'ing, and would also be |
| 228 | * permitted to freshly attach with ptrace now, permit it. |
| 229 | */ |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 230 | if (task_is_stopped_or_traced(task)) { |
| 231 | int match; |
| 232 | rcu_read_lock(); |
| 233 | match = (tracehook_tracer_task(task) == current); |
| 234 | rcu_read_unlock(); |
| 235 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) |
| 236 | return 0; |
| 237 | } |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 238 | |
| 239 | /* |
| 240 | * Noone else is allowed. |
| 241 | */ |
| 242 | return -EPERM; |
| 243 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 245 | struct mm_struct *mm_for_maps(struct task_struct *task) |
| 246 | { |
| 247 | struct mm_struct *mm = get_task_mm(task); |
| 248 | if (!mm) |
| 249 | return NULL; |
| 250 | down_read(&mm->mmap_sem); |
| 251 | task_lock(task); |
| 252 | if (task->mm != mm) |
| 253 | goto out; |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 254 | if (task->mm != current->mm && |
| 255 | __ptrace_may_access(task, PTRACE_MODE_READ) < 0) |
Al Viro | 831830b | 2008-01-02 14:09:57 +0000 | [diff] [blame] | 256 | goto out; |
| 257 | task_unlock(task); |
| 258 | return mm; |
| 259 | out: |
| 260 | task_unlock(task); |
| 261 | up_read(&mm->mmap_sem); |
| 262 | mmput(mm); |
| 263 | return NULL; |
| 264 | } |
| 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
| 267 | { |
| 268 | int res = 0; |
| 269 | unsigned int len; |
| 270 | struct mm_struct *mm = get_task_mm(task); |
| 271 | if (!mm) |
| 272 | goto out; |
| 273 | if (!mm->arg_end) |
| 274 | goto out_mm; /* Shh! No looking before we're done */ |
| 275 | |
| 276 | len = mm->arg_end - mm->arg_start; |
| 277 | |
| 278 | if (len > PAGE_SIZE) |
| 279 | len = PAGE_SIZE; |
| 280 | |
| 281 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); |
| 282 | |
| 283 | // If the nul at the end of args has been overwritten, then |
| 284 | // assume application is using setproctitle(3). |
| 285 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { |
| 286 | len = strnlen(buffer, res); |
| 287 | if (len < res) { |
| 288 | res = len; |
| 289 | } else { |
| 290 | len = mm->env_end - mm->env_start; |
| 291 | if (len > PAGE_SIZE - res) |
| 292 | len = PAGE_SIZE - res; |
| 293 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); |
| 294 | res = strnlen(buffer, res); |
| 295 | } |
| 296 | } |
| 297 | out_mm: |
| 298 | mmput(mm); |
| 299 | out: |
| 300 | return res; |
| 301 | } |
| 302 | |
| 303 | static int proc_pid_auxv(struct task_struct *task, char *buffer) |
| 304 | { |
| 305 | int res = 0; |
| 306 | struct mm_struct *mm = get_task_mm(task); |
| 307 | if (mm) { |
| 308 | unsigned int nwords = 0; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 309 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | nwords += 2; |
Hannes Eder | dfe6b7d | 2008-12-30 18:49:13 +0300 | [diff] [blame] | 311 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | res = nwords * sizeof(mm->saved_auxv[0]); |
| 313 | if (res > PAGE_SIZE) |
| 314 | res = PAGE_SIZE; |
| 315 | memcpy(buffer, mm->saved_auxv, res); |
| 316 | mmput(mm); |
| 317 | } |
| 318 | return res; |
| 319 | } |
| 320 | |
| 321 | |
| 322 | #ifdef CONFIG_KALLSYMS |
| 323 | /* |
| 324 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. |
| 325 | * Returns the resolved symbol. If that fails, simply return the address. |
| 326 | */ |
| 327 | static int proc_pid_wchan(struct task_struct *task, char *buffer) |
| 328 | { |
Alexey Dobriyan | ffb4512 | 2007-05-08 00:28:41 -0700 | [diff] [blame] | 329 | unsigned long wchan; |
Tejun Heo | 9281ace | 2007-07-17 04:03:51 -0700 | [diff] [blame] | 330 | char symname[KSYM_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | wchan = get_wchan(task); |
| 333 | |
Alexey Dobriyan | 9d65cb4 | 2007-05-08 00:28:43 -0700 | [diff] [blame] | 334 | if (lookup_symbol_name(wchan, symname) < 0) |
| 335 | return sprintf(buffer, "%lu", wchan); |
| 336 | else |
| 337 | return sprintf(buffer, "%s", symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
| 339 | #endif /* CONFIG_KALLSYMS */ |
| 340 | |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 341 | #ifdef CONFIG_STACKTRACE |
| 342 | |
| 343 | #define MAX_STACK_TRACE_DEPTH 64 |
| 344 | |
| 345 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, |
| 346 | struct pid *pid, struct task_struct *task) |
| 347 | { |
| 348 | struct stack_trace trace; |
| 349 | unsigned long *entries; |
| 350 | int i; |
| 351 | |
| 352 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); |
| 353 | if (!entries) |
| 354 | return -ENOMEM; |
| 355 | |
| 356 | trace.nr_entries = 0; |
| 357 | trace.max_entries = MAX_STACK_TRACE_DEPTH; |
| 358 | trace.entries = entries; |
| 359 | trace.skip = 0; |
| 360 | save_stack_trace_tsk(task, &trace); |
| 361 | |
| 362 | for (i = 0; i < trace.nr_entries; i++) { |
| 363 | seq_printf(m, "[<%p>] %pS\n", |
| 364 | (void *)entries[i], (void *)entries[i]); |
| 365 | } |
| 366 | kfree(entries); |
| 367 | |
| 368 | return 0; |
| 369 | } |
| 370 | #endif |
| 371 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | #ifdef CONFIG_SCHEDSTATS |
| 373 | /* |
| 374 | * Provides /proc/PID/schedstat |
| 375 | */ |
| 376 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) |
| 377 | { |
Balbir Singh | 172ba84 | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 378 | return sprintf(buffer, "%llu %llu %lu\n", |
Ingo Molnar | 826e08b | 2008-12-22 07:37:41 +0100 | [diff] [blame] | 379 | (unsigned long long)task->se.sum_exec_runtime, |
| 380 | (unsigned long long)task->sched_info.run_delay, |
Ingo Molnar | 2d72376 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 381 | task->sched_info.pcount); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | } |
| 383 | #endif |
| 384 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 385 | #ifdef CONFIG_LATENCYTOP |
| 386 | static int lstats_show_proc(struct seq_file *m, void *v) |
| 387 | { |
| 388 | int i; |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 389 | struct inode *inode = m->private; |
| 390 | struct task_struct *task = get_proc_task(inode); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 391 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 392 | if (!task) |
| 393 | return -ESRCH; |
| 394 | seq_puts(m, "Latency Top version : v0.1\n"); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 395 | for (i = 0; i < 32; i++) { |
| 396 | if (task->latency_record[i].backtrace[0]) { |
| 397 | int q; |
| 398 | seq_printf(m, "%i %li %li ", |
| 399 | task->latency_record[i].count, |
| 400 | task->latency_record[i].time, |
| 401 | task->latency_record[i].max); |
| 402 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
Hugh Dickins | 9c24624 | 2008-12-09 13:14:27 -0800 | [diff] [blame] | 403 | char sym[KSYM_SYMBOL_LEN]; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 404 | char *c; |
| 405 | if (!task->latency_record[i].backtrace[q]) |
| 406 | break; |
| 407 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) |
| 408 | break; |
| 409 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); |
| 410 | c = strchr(sym, '+'); |
| 411 | if (c) |
| 412 | *c = 0; |
| 413 | seq_printf(m, "%s ", sym); |
| 414 | } |
| 415 | seq_printf(m, "\n"); |
| 416 | } |
| 417 | |
| 418 | } |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 419 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | static int lstats_open(struct inode *inode, struct file *file) |
| 424 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 425 | return single_open(file, lstats_show_proc, inode); |
Hiroshi Shimamoto | d6643d1 | 2008-02-14 10:27:00 -0800 | [diff] [blame] | 426 | } |
| 427 | |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 428 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
| 429 | size_t count, loff_t *offs) |
| 430 | { |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 431 | 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] | 432 | |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 433 | if (!task) |
| 434 | return -ESRCH; |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 435 | clear_all_latency_tracing(task); |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 436 | put_task_struct(task); |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 437 | |
| 438 | return count; |
| 439 | } |
| 440 | |
| 441 | static const struct file_operations proc_lstats_operations = { |
| 442 | .open = lstats_open, |
| 443 | .read = seq_read, |
| 444 | .write = lstats_write, |
| 445 | .llseek = seq_lseek, |
Hiroshi Shimamoto | 13d77c3 | 2008-02-20 16:53:29 -0800 | [diff] [blame] | 446 | .release = single_release, |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 447 | }; |
| 448 | |
| 449 | #endif |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | /* The badness from the OOM killer */ |
| 452 | unsigned long badness(struct task_struct *p, unsigned long uptime); |
| 453 | static int proc_oom_score(struct task_struct *task, char *buffer) |
| 454 | { |
| 455 | unsigned long points; |
| 456 | struct timespec uptime; |
| 457 | |
| 458 | do_posix_clock_monotonic_gettime(&uptime); |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 459 | read_lock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | points = badness(task, uptime.tv_sec); |
Alexey Dobriyan | 19c5d45 | 2007-05-08 00:26:46 -0700 | [diff] [blame] | 461 | read_unlock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | return sprintf(buffer, "%lu\n", points); |
| 463 | } |
| 464 | |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 465 | struct limit_names { |
| 466 | char *name; |
| 467 | char *unit; |
| 468 | }; |
| 469 | |
| 470 | static const struct limit_names lnames[RLIM_NLIMITS] = { |
| 471 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, |
| 472 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
| 473 | [RLIMIT_DATA] = {"Max data size", "bytes"}, |
| 474 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, |
| 475 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, |
| 476 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, |
| 477 | [RLIMIT_NPROC] = {"Max processes", "processes"}, |
| 478 | [RLIMIT_NOFILE] = {"Max open files", "files"}, |
| 479 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, |
| 480 | [RLIMIT_AS] = {"Max address space", "bytes"}, |
| 481 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, |
| 482 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, |
| 483 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, |
| 484 | [RLIMIT_NICE] = {"Max nice priority", NULL}, |
| 485 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, |
Eugene Teo | 8808117 | 2008-02-23 15:23:52 -0800 | [diff] [blame] | 486 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 487 | }; |
| 488 | |
| 489 | /* Display limits for a process */ |
| 490 | static int proc_pid_limits(struct task_struct *task, char *buffer) |
| 491 | { |
| 492 | unsigned int i; |
| 493 | int count = 0; |
| 494 | unsigned long flags; |
| 495 | char *bufptr = buffer; |
| 496 | |
| 497 | struct rlimit rlim[RLIM_NLIMITS]; |
| 498 | |
Lai Jiangshan | a6bebbc | 2008-10-05 00:51:15 +0400 | [diff] [blame] | 499 | if (!lock_task_sighand(task, &flags)) |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 500 | return 0; |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 501 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
| 502 | unlock_task_sighand(task, &flags); |
Neil Horman | d85f50d | 2007-10-18 23:40:37 -0700 | [diff] [blame] | 503 | |
| 504 | /* |
| 505 | * print the file header |
| 506 | */ |
| 507 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", |
| 508 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
| 509 | |
| 510 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 511 | if (rlim[i].rlim_cur == RLIM_INFINITY) |
| 512 | count += sprintf(&bufptr[count], "%-25s %-20s ", |
| 513 | lnames[i].name, "unlimited"); |
| 514 | else |
| 515 | count += sprintf(&bufptr[count], "%-25s %-20lu ", |
| 516 | lnames[i].name, rlim[i].rlim_cur); |
| 517 | |
| 518 | if (rlim[i].rlim_max == RLIM_INFINITY) |
| 519 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); |
| 520 | else |
| 521 | count += sprintf(&bufptr[count], "%-20lu ", |
| 522 | rlim[i].rlim_max); |
| 523 | |
| 524 | if (lnames[i].unit) |
| 525 | count += sprintf(&bufptr[count], "%-10s\n", |
| 526 | lnames[i].unit); |
| 527 | else |
| 528 | count += sprintf(&bufptr[count], "\n"); |
| 529 | } |
| 530 | |
| 531 | return count; |
| 532 | } |
| 533 | |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 534 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
| 535 | static int proc_pid_syscall(struct task_struct *task, char *buffer) |
| 536 | { |
| 537 | long nr; |
| 538 | unsigned long args[6], sp, pc; |
| 539 | |
| 540 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) |
| 541 | return sprintf(buffer, "running\n"); |
| 542 | |
| 543 | if (nr < 0) |
| 544 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
| 545 | |
| 546 | return sprintf(buffer, |
| 547 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
| 548 | nr, |
| 549 | args[0], args[1], args[2], args[3], args[4], args[5], |
| 550 | sp, pc); |
| 551 | } |
| 552 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ |
| 553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | /************************************************************************/ |
| 555 | /* Here the fs part begins */ |
| 556 | /************************************************************************/ |
| 557 | |
| 558 | /* permission checks */ |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 559 | static int proc_fd_access_allowed(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | { |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 561 | struct task_struct *task; |
| 562 | int allowed = 0; |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 563 | /* Allow access to a task's file descriptors if it is us or we |
| 564 | * may use ptrace attach to the process and find out that |
| 565 | * information. |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 566 | */ |
| 567 | task = get_proc_task(inode); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 568 | if (task) { |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 569 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 570 | put_task_struct(task); |
Eric W. Biederman | df26c40 | 2006-06-26 00:25:59 -0700 | [diff] [blame] | 571 | } |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 572 | return allowed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 575 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
| 576 | { |
| 577 | int error; |
| 578 | struct inode *inode = dentry->d_inode; |
| 579 | |
| 580 | if (attr->ia_valid & ATTR_MODE) |
| 581 | return -EPERM; |
| 582 | |
| 583 | error = inode_change_ok(inode, attr); |
John Johansen | 1e8123f | 2007-05-08 00:29:41 -0700 | [diff] [blame] | 584 | if (!error) |
| 585 | error = inode_setattr(inode, attr); |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 586 | return error; |
| 587 | } |
| 588 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 589 | static const struct inode_operations proc_def_inode_operations = { |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 590 | .setattr = proc_setattr, |
| 591 | }; |
| 592 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 593 | static int mounts_open_common(struct inode *inode, struct file *file, |
| 594 | const struct seq_operations *op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 596 | struct task_struct *task = get_proc_task(inode); |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 597 | struct nsproxy *nsp; |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 598 | struct mnt_namespace *ns = NULL; |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 599 | struct fs_struct *fs = NULL; |
| 600 | struct path root; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 601 | struct proc_mounts *p; |
| 602 | int ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 604 | if (task) { |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 605 | rcu_read_lock(); |
| 606 | nsp = task_nsproxy(task); |
| 607 | if (nsp) { |
| 608 | ns = nsp->mnt_ns; |
Alexey Dobriyan | 863c470 | 2007-01-26 00:56:53 -0800 | [diff] [blame] | 609 | if (ns) |
| 610 | get_mnt_ns(ns); |
| 611 | } |
Pavel Emelyanov | cf7b708 | 2007-10-18 23:39:54 -0700 | [diff] [blame] | 612 | rcu_read_unlock(); |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 613 | if (ns) |
| 614 | fs = get_fs_struct(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 615 | put_task_struct(task); |
| 616 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 618 | if (!ns) |
| 619 | goto err; |
| 620 | if (!fs) |
| 621 | goto err_put_ns; |
| 622 | |
| 623 | read_lock(&fs->lock); |
| 624 | root = fs->root; |
| 625 | path_get(&root); |
| 626 | read_unlock(&fs->lock); |
| 627 | put_fs_struct(fs); |
| 628 | |
| 629 | ret = -ENOMEM; |
| 630 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); |
| 631 | if (!p) |
| 632 | goto err_put_path; |
| 633 | |
| 634 | file->private_data = &p->m; |
| 635 | ret = seq_open(file, op); |
| 636 | if (ret) |
| 637 | goto err_free; |
| 638 | |
| 639 | p->m.private = p; |
| 640 | p->ns = ns; |
| 641 | p->root = root; |
| 642 | p->event = ns->event; |
| 643 | |
| 644 | return 0; |
| 645 | |
| 646 | err_free: |
| 647 | kfree(p); |
| 648 | err_put_path: |
| 649 | path_put(&root); |
| 650 | err_put_ns: |
| 651 | put_mnt_ns(ns); |
| 652 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | return ret; |
| 654 | } |
| 655 | |
| 656 | static int mounts_release(struct inode *inode, struct file *file) |
| 657 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 658 | struct proc_mounts *p = file->private_data; |
| 659 | path_put(&p->root); |
| 660 | put_mnt_ns(p->ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | return seq_release(inode, file); |
| 662 | } |
| 663 | |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 664 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
| 665 | { |
| 666 | struct proc_mounts *p = file->private_data; |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 667 | struct mnt_namespace *ns = p->ns; |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 668 | unsigned res = 0; |
| 669 | |
| 670 | poll_wait(file, &ns->poll, wait); |
| 671 | |
| 672 | spin_lock(&vfsmount_lock); |
| 673 | if (p->event != ns->event) { |
| 674 | p->event = ns->event; |
| 675 | res = POLLERR; |
| 676 | } |
| 677 | spin_unlock(&vfsmount_lock); |
| 678 | |
| 679 | return res; |
| 680 | } |
| 681 | |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 682 | static int mounts_open(struct inode *inode, struct file *file) |
| 683 | { |
| 684 | return mounts_open_common(inode, file, &mounts_op); |
| 685 | } |
| 686 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 687 | static const struct file_operations proc_mounts_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | .open = mounts_open, |
| 689 | .read = seq_read, |
| 690 | .llseek = seq_lseek, |
| 691 | .release = mounts_release, |
Al Viro | 5addc5d | 2005-11-07 17:15:49 -0500 | [diff] [blame] | 692 | .poll = mounts_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | }; |
| 694 | |
Ram Pai | 2d4d486 | 2008-03-27 13:06:25 +0100 | [diff] [blame] | 695 | static int mountinfo_open(struct inode *inode, struct file *file) |
| 696 | { |
| 697 | return mounts_open_common(inode, file, &mountinfo_op); |
| 698 | } |
| 699 | |
| 700 | static const struct file_operations proc_mountinfo_operations = { |
| 701 | .open = mountinfo_open, |
| 702 | .read = seq_read, |
| 703 | .llseek = seq_lseek, |
| 704 | .release = mounts_release, |
| 705 | .poll = mounts_poll, |
| 706 | }; |
| 707 | |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 708 | static int mountstats_open(struct inode *inode, struct file *file) |
| 709 | { |
Miklos Szeredi | a1a2c40 | 2008-03-27 13:06:24 +0100 | [diff] [blame] | 710 | return mounts_open_common(inode, file, &mountstats_op); |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 711 | } |
| 712 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 713 | static const struct file_operations proc_mountstats_operations = { |
Chuck Lever | b4629fe | 2006-03-20 13:44:12 -0500 | [diff] [blame] | 714 | .open = mountstats_open, |
| 715 | .read = seq_read, |
| 716 | .llseek = seq_lseek, |
| 717 | .release = mounts_release, |
| 718 | }; |
| 719 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
| 721 | |
| 722 | static ssize_t proc_info_read(struct file * file, char __user * buf, |
| 723 | size_t count, loff_t *ppos) |
| 724 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 725 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | unsigned long page; |
| 727 | ssize_t length; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 728 | struct task_struct *task = get_proc_task(inode); |
| 729 | |
| 730 | length = -ESRCH; |
| 731 | if (!task) |
| 732 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | if (count > PROC_BLOCK_SIZE) |
| 735 | count = PROC_BLOCK_SIZE; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 736 | |
| 737 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 738 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 739 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
| 741 | length = PROC_I(inode)->op.proc_read(task, (char*)page); |
| 742 | |
| 743 | if (length >= 0) |
| 744 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); |
| 745 | free_page(page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 746 | out: |
| 747 | put_task_struct(task); |
| 748 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | return length; |
| 750 | } |
| 751 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 752 | static const struct file_operations proc_info_file_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | .read = proc_info_read, |
| 754 | }; |
| 755 | |
Eric W. Biederman | be61408 | 2008-02-08 04:18:30 -0800 | [diff] [blame] | 756 | static int proc_single_show(struct seq_file *m, void *v) |
| 757 | { |
| 758 | struct inode *inode = m->private; |
| 759 | struct pid_namespace *ns; |
| 760 | struct pid *pid; |
| 761 | struct task_struct *task; |
| 762 | int ret; |
| 763 | |
| 764 | ns = inode->i_sb->s_fs_info; |
| 765 | pid = proc_pid(inode); |
| 766 | task = get_pid_task(pid, PIDTYPE_PID); |
| 767 | if (!task) |
| 768 | return -ESRCH; |
| 769 | |
| 770 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); |
| 771 | |
| 772 | put_task_struct(task); |
| 773 | return ret; |
| 774 | } |
| 775 | |
| 776 | static int proc_single_open(struct inode *inode, struct file *filp) |
| 777 | { |
| 778 | int ret; |
| 779 | ret = single_open(filp, proc_single_show, NULL); |
| 780 | if (!ret) { |
| 781 | struct seq_file *m = filp->private_data; |
| 782 | |
| 783 | m->private = inode; |
| 784 | } |
| 785 | return ret; |
| 786 | } |
| 787 | |
| 788 | static const struct file_operations proc_single_file_operations = { |
| 789 | .open = proc_single_open, |
| 790 | .read = seq_read, |
| 791 | .llseek = seq_lseek, |
| 792 | .release = single_release, |
| 793 | }; |
| 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | static int mem_open(struct inode* inode, struct file* file) |
| 796 | { |
| 797 | file->private_data = (void*)((long)current->self_exec_id); |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | static ssize_t mem_read(struct file * file, char __user * buf, |
| 802 | size_t count, loff_t *ppos) |
| 803 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 804 | 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] | 805 | char *page; |
| 806 | unsigned long src = *ppos; |
| 807 | int ret = -ESRCH; |
| 808 | struct mm_struct *mm; |
| 809 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 810 | if (!task) |
| 811 | goto out_no_task; |
| 812 | |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 813 | if (check_mem_permission(task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | goto out; |
| 815 | |
| 816 | ret = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 817 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | if (!page) |
| 819 | goto out; |
| 820 | |
| 821 | ret = 0; |
| 822 | |
| 823 | mm = get_task_mm(task); |
| 824 | if (!mm) |
| 825 | goto out_free; |
| 826 | |
| 827 | ret = -EIO; |
| 828 | |
| 829 | if (file->private_data != (void*)((long)current->self_exec_id)) |
| 830 | goto out_put; |
| 831 | |
| 832 | ret = 0; |
| 833 | |
| 834 | while (count > 0) { |
| 835 | int this_len, retval; |
| 836 | |
| 837 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 838 | retval = access_process_vm(task, src, page, this_len, 0); |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 839 | if (!retval || check_mem_permission(task)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | if (!ret) |
| 841 | ret = -EIO; |
| 842 | break; |
| 843 | } |
| 844 | |
| 845 | if (copy_to_user(buf, page, retval)) { |
| 846 | ret = -EFAULT; |
| 847 | break; |
| 848 | } |
| 849 | |
| 850 | ret += retval; |
| 851 | src += retval; |
| 852 | buf += retval; |
| 853 | count -= retval; |
| 854 | } |
| 855 | *ppos = src; |
| 856 | |
| 857 | out_put: |
| 858 | mmput(mm); |
| 859 | out_free: |
| 860 | free_page((unsigned long) page); |
| 861 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 862 | put_task_struct(task); |
| 863 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | return ret; |
| 865 | } |
| 866 | |
| 867 | #define mem_write NULL |
| 868 | |
| 869 | #ifndef mem_write |
| 870 | /* This is a security hazard */ |
Glauber de Oliveira Costa | 63967fa | 2007-02-20 13:58:12 -0800 | [diff] [blame] | 871 | static ssize_t mem_write(struct file * file, const char __user *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | size_t count, loff_t *ppos) |
| 873 | { |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 874 | int copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | char *page; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 876 | 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] | 877 | unsigned long dst = *ppos; |
| 878 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 879 | copied = -ESRCH; |
| 880 | if (!task) |
| 881 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
Roland McGrath | 638fa20 | 2008-04-29 01:01:38 -0700 | [diff] [blame] | 883 | if (check_mem_permission(task)) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 884 | goto out; |
| 885 | |
| 886 | copied = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 887 | page = (char *)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | if (!page) |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 889 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
Frederik Deweerdt | f7ca54f | 2006-09-29 02:01:02 -0700 | [diff] [blame] | 891 | copied = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | while (count > 0) { |
| 893 | int this_len, retval; |
| 894 | |
| 895 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 896 | if (copy_from_user(page, buf, this_len)) { |
| 897 | copied = -EFAULT; |
| 898 | break; |
| 899 | } |
| 900 | retval = access_process_vm(task, dst, page, this_len, 1); |
| 901 | if (!retval) { |
| 902 | if (!copied) |
| 903 | copied = -EIO; |
| 904 | break; |
| 905 | } |
| 906 | copied += retval; |
| 907 | buf += retval; |
| 908 | dst += retval; |
| 909 | count -= retval; |
| 910 | } |
| 911 | *ppos = dst; |
| 912 | free_page((unsigned long) page); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 913 | out: |
| 914 | put_task_struct(task); |
| 915 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | return copied; |
| 917 | } |
| 918 | #endif |
| 919 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 920 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | { |
| 922 | switch (orig) { |
| 923 | case 0: |
| 924 | file->f_pos = offset; |
| 925 | break; |
| 926 | case 1: |
| 927 | file->f_pos += offset; |
| 928 | break; |
| 929 | default: |
| 930 | return -EINVAL; |
| 931 | } |
| 932 | force_successful_syscall_return(); |
| 933 | return file->f_pos; |
| 934 | } |
| 935 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 936 | static const struct file_operations proc_mem_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | .llseek = mem_lseek, |
| 938 | .read = mem_read, |
| 939 | .write = mem_write, |
| 940 | .open = mem_open, |
| 941 | }; |
| 942 | |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 943 | static ssize_t environ_read(struct file *file, char __user *buf, |
| 944 | size_t count, loff_t *ppos) |
| 945 | { |
| 946 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 947 | char *page; |
| 948 | unsigned long src = *ppos; |
| 949 | int ret = -ESRCH; |
| 950 | struct mm_struct *mm; |
| 951 | |
| 952 | if (!task) |
| 953 | goto out_no_task; |
| 954 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 955 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
James Pearson | 315e28c | 2007-10-16 23:30:17 -0700 | [diff] [blame] | 956 | goto out; |
| 957 | |
| 958 | ret = -ENOMEM; |
| 959 | page = (char *)__get_free_page(GFP_TEMPORARY); |
| 960 | if (!page) |
| 961 | goto out; |
| 962 | |
| 963 | ret = 0; |
| 964 | |
| 965 | mm = get_task_mm(task); |
| 966 | if (!mm) |
| 967 | goto out_free; |
| 968 | |
| 969 | while (count > 0) { |
| 970 | int this_len, retval, max_len; |
| 971 | |
| 972 | this_len = mm->env_end - (mm->env_start + src); |
| 973 | |
| 974 | if (this_len <= 0) |
| 975 | break; |
| 976 | |
| 977 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; |
| 978 | this_len = (this_len > max_len) ? max_len : this_len; |
| 979 | |
| 980 | retval = access_process_vm(task, (mm->env_start + src), |
| 981 | page, this_len, 0); |
| 982 | |
| 983 | if (retval <= 0) { |
| 984 | ret = retval; |
| 985 | break; |
| 986 | } |
| 987 | |
| 988 | if (copy_to_user(buf, page, retval)) { |
| 989 | ret = -EFAULT; |
| 990 | break; |
| 991 | } |
| 992 | |
| 993 | ret += retval; |
| 994 | src += retval; |
| 995 | buf += retval; |
| 996 | count -= retval; |
| 997 | } |
| 998 | *ppos = src; |
| 999 | |
| 1000 | mmput(mm); |
| 1001 | out_free: |
| 1002 | free_page((unsigned long) page); |
| 1003 | out: |
| 1004 | put_task_struct(task); |
| 1005 | out_no_task: |
| 1006 | return ret; |
| 1007 | } |
| 1008 | |
| 1009 | static const struct file_operations proc_environ_operations = { |
| 1010 | .read = environ_read, |
| 1011 | }; |
| 1012 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
| 1014 | size_t count, loff_t *ppos) |
| 1015 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1016 | 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] | 1017 | char buffer[PROC_NUMBUF]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | size_t len; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1019 | int oom_adjust; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1021 | if (!task) |
| 1022 | return -ESRCH; |
| 1023 | oom_adjust = task->oomkilladj; |
| 1024 | put_task_struct(task); |
| 1025 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1026 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1027 | |
| 1028 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
| 1031 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, |
| 1032 | size_t count, loff_t *ppos) |
| 1033 | { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1034 | struct task_struct *task; |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1035 | char buffer[PROC_NUMBUF], *end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | int oom_adjust; |
| 1037 | |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 1038 | memset(buffer, 0, sizeof(buffer)); |
| 1039 | if (count > sizeof(buffer) - 1) |
| 1040 | count = sizeof(buffer) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | if (copy_from_user(buffer, buf, count)) |
| 1042 | return -EFAULT; |
| 1043 | oom_adjust = simple_strtol(buffer, &end, 0); |
Alexey Dobriyan | 8ac773b | 2006-10-19 23:28:32 -0700 | [diff] [blame] | 1044 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
| 1045 | oom_adjust != OOM_DISABLE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | return -EINVAL; |
| 1047 | if (*end == '\n') |
| 1048 | end++; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1049 | task = get_proc_task(file->f_path.dentry->d_inode); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1050 | if (!task) |
| 1051 | return -ESRCH; |
Guillem Jover | 8fb4fc6 | 2006-12-06 20:32:24 -0800 | [diff] [blame] | 1052 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
| 1053 | put_task_struct(task); |
| 1054 | return -EACCES; |
| 1055 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | task->oomkilladj = oom_adjust; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1057 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | if (end - buffer == 0) |
| 1059 | return -EIO; |
| 1060 | return end - buffer; |
| 1061 | } |
| 1062 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1063 | static const struct file_operations proc_oom_adjust_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | .read = oom_adjust_read, |
| 1065 | .write = oom_adjust_write, |
| 1066 | }; |
| 1067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | #ifdef CONFIG_AUDITSYSCALL |
| 1069 | #define TMPBUFLEN 21 |
| 1070 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
| 1071 | size_t count, loff_t *ppos) |
| 1072 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1073 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1074 | struct task_struct *task = get_proc_task(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | ssize_t length; |
| 1076 | char tmpbuf[TMPBUFLEN]; |
| 1077 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1078 | if (!task) |
| 1079 | return -ESRCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
Al Viro | 0c11b94 | 2008-01-10 04:20:52 -0500 | [diff] [blame] | 1081 | audit_get_loginuid(task)); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1082 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1084 | } |
| 1085 | |
| 1086 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, |
| 1087 | size_t count, loff_t *ppos) |
| 1088 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1089 | struct inode * inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | char *page, *tmp; |
| 1091 | ssize_t length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | uid_t loginuid; |
| 1093 | |
| 1094 | if (!capable(CAP_AUDIT_CONTROL)) |
| 1095 | return -EPERM; |
| 1096 | |
Eric W. Biederman | 13b41b0 | 2006-06-26 00:25:56 -0700 | [diff] [blame] | 1097 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | return -EPERM; |
| 1099 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1100 | if (count >= PAGE_SIZE) |
| 1101 | count = PAGE_SIZE - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | |
| 1103 | if (*ppos != 0) { |
| 1104 | /* No partial writes. */ |
| 1105 | return -EINVAL; |
| 1106 | } |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1107 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | if (!page) |
| 1109 | return -ENOMEM; |
| 1110 | length = -EFAULT; |
| 1111 | if (copy_from_user(page, buf, count)) |
| 1112 | goto out_free_page; |
| 1113 | |
Al Viro | e018290 | 2006-05-18 08:28:02 -0400 | [diff] [blame] | 1114 | page[count] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | loginuid = simple_strtoul(page, &tmp, 10); |
| 1116 | if (tmp == page) { |
| 1117 | length = -EINVAL; |
| 1118 | goto out_free_page; |
| 1119 | |
| 1120 | } |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1121 | length = audit_set_loginuid(current, loginuid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (likely(length == 0)) |
| 1123 | length = count; |
| 1124 | |
| 1125 | out_free_page: |
| 1126 | free_page((unsigned long) page); |
| 1127 | return length; |
| 1128 | } |
| 1129 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1130 | static const struct file_operations proc_loginuid_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | .read = proc_loginuid_read, |
| 1132 | .write = proc_loginuid_write, |
| 1133 | }; |
Eric Paris | 1e0bd75 | 2008-03-13 08:15:31 -0400 | [diff] [blame] | 1134 | |
| 1135 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, |
| 1136 | size_t count, loff_t *ppos) |
| 1137 | { |
| 1138 | struct inode * inode = file->f_path.dentry->d_inode; |
| 1139 | struct task_struct *task = get_proc_task(inode); |
| 1140 | ssize_t length; |
| 1141 | char tmpbuf[TMPBUFLEN]; |
| 1142 | |
| 1143 | if (!task) |
| 1144 | return -ESRCH; |
| 1145 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
| 1146 | audit_get_sessionid(task)); |
| 1147 | put_task_struct(task); |
| 1148 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
| 1149 | } |
| 1150 | |
| 1151 | static const struct file_operations proc_sessionid_operations = { |
| 1152 | .read = proc_sessionid_read, |
| 1153 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | #endif |
| 1155 | |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1156 | #ifdef CONFIG_FAULT_INJECTION |
| 1157 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, |
| 1158 | size_t count, loff_t *ppos) |
| 1159 | { |
| 1160 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 1161 | char buffer[PROC_NUMBUF]; |
| 1162 | size_t len; |
| 1163 | int make_it_fail; |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1164 | |
| 1165 | if (!task) |
| 1166 | return -ESRCH; |
| 1167 | make_it_fail = task->make_it_fail; |
| 1168 | put_task_struct(task); |
| 1169 | |
| 1170 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1171 | |
| 1172 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | static ssize_t proc_fault_inject_write(struct file * file, |
| 1176 | const char __user * buf, size_t count, loff_t *ppos) |
| 1177 | { |
| 1178 | struct task_struct *task; |
| 1179 | char buffer[PROC_NUMBUF], *end; |
| 1180 | int make_it_fail; |
| 1181 | |
| 1182 | if (!capable(CAP_SYS_RESOURCE)) |
| 1183 | return -EPERM; |
| 1184 | memset(buffer, 0, sizeof(buffer)); |
| 1185 | if (count > sizeof(buffer) - 1) |
| 1186 | count = sizeof(buffer) - 1; |
| 1187 | if (copy_from_user(buffer, buf, count)) |
| 1188 | return -EFAULT; |
| 1189 | make_it_fail = simple_strtol(buffer, &end, 0); |
| 1190 | if (*end == '\n') |
| 1191 | end++; |
| 1192 | task = get_proc_task(file->f_dentry->d_inode); |
| 1193 | if (!task) |
| 1194 | return -ESRCH; |
| 1195 | task->make_it_fail = make_it_fail; |
| 1196 | put_task_struct(task); |
| 1197 | if (end - buffer == 0) |
| 1198 | return -EIO; |
| 1199 | return end - buffer; |
| 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 | |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 1268 | /* |
| 1269 | * We added or removed a vma mapping the executable. The vmas are only mapped |
| 1270 | * during exec and are not mapped with the mmap system call. |
| 1271 | * Callers must hold down_write() on the mm's mmap_sem for these |
| 1272 | */ |
| 1273 | void added_exe_file_vma(struct mm_struct *mm) |
| 1274 | { |
| 1275 | mm->num_exe_file_vmas++; |
| 1276 | } |
| 1277 | |
| 1278 | void removed_exe_file_vma(struct mm_struct *mm) |
| 1279 | { |
| 1280 | mm->num_exe_file_vmas--; |
| 1281 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ |
| 1282 | fput(mm->exe_file); |
| 1283 | mm->exe_file = NULL; |
| 1284 | } |
| 1285 | |
| 1286 | } |
| 1287 | |
| 1288 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) |
| 1289 | { |
| 1290 | if (new_exe_file) |
| 1291 | get_file(new_exe_file); |
| 1292 | if (mm->exe_file) |
| 1293 | fput(mm->exe_file); |
| 1294 | mm->exe_file = new_exe_file; |
| 1295 | mm->num_exe_file_vmas = 0; |
| 1296 | } |
| 1297 | |
| 1298 | struct file *get_mm_exe_file(struct mm_struct *mm) |
| 1299 | { |
| 1300 | struct file *exe_file; |
| 1301 | |
| 1302 | /* We need mmap_sem to protect against races with removal of |
| 1303 | * VM_EXECUTABLE vmas */ |
| 1304 | down_read(&mm->mmap_sem); |
| 1305 | exe_file = mm->exe_file; |
| 1306 | if (exe_file) |
| 1307 | get_file(exe_file); |
| 1308 | up_read(&mm->mmap_sem); |
| 1309 | return exe_file; |
| 1310 | } |
| 1311 | |
| 1312 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) |
| 1313 | { |
| 1314 | /* It's safe to write the exe_file pointer without exe_file_lock because |
| 1315 | * this is called during fork when the task is not yet in /proc */ |
| 1316 | newmm->exe_file = get_mm_exe_file(oldmm); |
| 1317 | } |
| 1318 | |
| 1319 | static int proc_exe_link(struct inode *inode, struct path *exe_path) |
| 1320 | { |
| 1321 | struct task_struct *task; |
| 1322 | struct mm_struct *mm; |
| 1323 | struct file *exe_file; |
| 1324 | |
| 1325 | task = get_proc_task(inode); |
| 1326 | if (!task) |
| 1327 | return -ENOENT; |
| 1328 | mm = get_task_mm(task); |
| 1329 | put_task_struct(task); |
| 1330 | if (!mm) |
| 1331 | return -ENOENT; |
| 1332 | exe_file = get_mm_exe_file(mm); |
| 1333 | mmput(mm); |
| 1334 | if (exe_file) { |
| 1335 | *exe_path = exe_file->f_path; |
| 1336 | path_get(&exe_file->f_path); |
| 1337 | fput(exe_file); |
| 1338 | return 0; |
| 1339 | } else |
| 1340 | return -ENOENT; |
| 1341 | } |
| 1342 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1343 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | { |
| 1345 | struct inode *inode = dentry->d_inode; |
| 1346 | int error = -EACCES; |
| 1347 | |
| 1348 | /* We don't need a base pointer in the /proc filesystem */ |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 1349 | path_put(&nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1351 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1352 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1355 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | nd->last_type = LAST_BIND; |
| 1357 | out: |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 1358 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | } |
| 1360 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1361 | 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] | 1362 | { |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 1363 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1364 | char *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | int len; |
| 1366 | |
| 1367 | if (!tmp) |
| 1368 | return -ENOMEM; |
Akinobu Mita | 0c28f28 | 2007-05-08 00:31:41 -0700 | [diff] [blame] | 1369 | |
Jan Blunck | cf28b48 | 2008-02-14 19:38:44 -0800 | [diff] [blame] | 1370 | pathname = d_path(path, tmp, PAGE_SIZE); |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1371 | len = PTR_ERR(pathname); |
| 1372 | if (IS_ERR(pathname)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | goto out; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1374 | len = tmp + PAGE_SIZE - 1 - pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | |
| 1376 | if (len > buflen) |
| 1377 | len = buflen; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1378 | if (copy_to_user(buffer, pathname, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | len = -EFAULT; |
| 1380 | out: |
| 1381 | free_page((unsigned long)tmp); |
| 1382 | return len; |
| 1383 | } |
| 1384 | |
| 1385 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) |
| 1386 | { |
| 1387 | int error = -EACCES; |
| 1388 | struct inode *inode = dentry->d_inode; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1389 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | |
Eric W. Biederman | 778c114 | 2006-06-26 00:25:58 -0700 | [diff] [blame] | 1391 | /* Are we allowed to snoop on the tasks file descriptors? */ |
| 1392 | if (!proc_fd_access_allowed(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1395 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | if (error) |
| 1397 | goto out; |
| 1398 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1399 | error = do_proc_readlink(&path, buffer, buflen); |
| 1400 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | return error; |
| 1403 | } |
| 1404 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1405 | static const struct inode_operations proc_pid_link_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | .readlink = proc_pid_readlink, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1407 | .follow_link = proc_pid_follow_link, |
| 1408 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | }; |
| 1410 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1411 | |
| 1412 | /* building an inode */ |
| 1413 | |
| 1414 | static int task_dumpable(struct task_struct *task) |
| 1415 | { |
| 1416 | int dumpable = 0; |
| 1417 | struct mm_struct *mm; |
| 1418 | |
| 1419 | task_lock(task); |
| 1420 | mm = task->mm; |
| 1421 | if (mm) |
Kawai, Hidehiro | 6c5d523 | 2007-07-19 01:48:27 -0700 | [diff] [blame] | 1422 | dumpable = get_dumpable(mm); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1423 | task_unlock(task); |
| 1424 | if(dumpable == 1) |
| 1425 | return 1; |
| 1426 | return 0; |
| 1427 | } |
| 1428 | |
| 1429 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1430 | 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] | 1431 | { |
| 1432 | struct inode * inode; |
| 1433 | struct proc_inode *ei; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1434 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1435 | |
| 1436 | /* We need a new inode */ |
| 1437 | |
| 1438 | inode = new_inode(sb); |
| 1439 | if (!inode) |
| 1440 | goto out; |
| 1441 | |
| 1442 | /* Common stuff */ |
| 1443 | ei = PROC_I(inode); |
| 1444 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1445 | inode->i_op = &proc_def_inode_operations; |
| 1446 | |
| 1447 | /* |
| 1448 | * grab the reference to task. |
| 1449 | */ |
Oleg Nesterov | 1a657f7 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 1450 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1451 | if (!ei->pid) |
| 1452 | goto out_unlock; |
| 1453 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1454 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1455 | rcu_read_lock(); |
| 1456 | cred = __task_cred(task); |
| 1457 | inode->i_uid = cred->euid; |
| 1458 | inode->i_gid = cred->egid; |
| 1459 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1460 | } |
| 1461 | security_task_to_inode(task, inode); |
| 1462 | |
| 1463 | out: |
| 1464 | return inode; |
| 1465 | |
| 1466 | out_unlock: |
| 1467 | iput(inode); |
| 1468 | return NULL; |
| 1469 | } |
| 1470 | |
| 1471 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 1472 | { |
| 1473 | struct inode *inode = dentry->d_inode; |
| 1474 | struct task_struct *task; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1475 | const struct cred *cred; |
| 1476 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1477 | generic_fillattr(inode, stat); |
| 1478 | |
| 1479 | rcu_read_lock(); |
| 1480 | stat->uid = 0; |
| 1481 | stat->gid = 0; |
| 1482 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
| 1483 | if (task) { |
| 1484 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1485 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1486 | cred = __task_cred(task); |
| 1487 | stat->uid = cred->euid; |
| 1488 | stat->gid = cred->egid; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1489 | } |
| 1490 | } |
| 1491 | rcu_read_unlock(); |
| 1492 | return 0; |
| 1493 | } |
| 1494 | |
| 1495 | /* dentry stuff */ |
| 1496 | |
| 1497 | /* |
| 1498 | * Exceptional case: normally we are not allowed to unhash a busy |
| 1499 | * directory. In this case, however, we can do it - no aliasing problems |
| 1500 | * due to the way we treat inodes. |
| 1501 | * |
| 1502 | * Rewrite the inode's ownerships here because the owning task may have |
| 1503 | * performed a setuid(), etc. |
| 1504 | * |
| 1505 | * Before the /proc/pid/status file was created the only way to read |
| 1506 | * the effective uid of a /process was to stat /proc/pid. Reading |
| 1507 | * /proc/pid/status is slow enough that procps and other packages |
| 1508 | * kept stating /proc/pid. To keep the rules in /proc simple I have |
| 1509 | * made this apply to all per process world readable and executable |
| 1510 | * directories. |
| 1511 | */ |
| 1512 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1513 | { |
| 1514 | struct inode *inode = dentry->d_inode; |
| 1515 | struct task_struct *task = get_proc_task(inode); |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1516 | const struct cred *cred; |
| 1517 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1518 | if (task) { |
| 1519 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
| 1520 | task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1521 | rcu_read_lock(); |
| 1522 | cred = __task_cred(task); |
| 1523 | inode->i_uid = cred->euid; |
| 1524 | inode->i_gid = cred->egid; |
| 1525 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1526 | } else { |
| 1527 | inode->i_uid = 0; |
| 1528 | inode->i_gid = 0; |
| 1529 | } |
| 1530 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1531 | security_task_to_inode(task, inode); |
| 1532 | put_task_struct(task); |
| 1533 | return 1; |
| 1534 | } |
| 1535 | d_drop(dentry); |
| 1536 | return 0; |
| 1537 | } |
| 1538 | |
| 1539 | static int pid_delete_dentry(struct dentry * dentry) |
| 1540 | { |
| 1541 | /* Is the task we represent dead? |
| 1542 | * If so, then don't put the dentry on the lru list, |
| 1543 | * kill it immediately. |
| 1544 | */ |
| 1545 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; |
| 1546 | } |
| 1547 | |
| 1548 | static struct dentry_operations pid_dentry_operations = |
| 1549 | { |
| 1550 | .d_revalidate = pid_revalidate, |
| 1551 | .d_delete = pid_delete_dentry, |
| 1552 | }; |
| 1553 | |
| 1554 | /* Lookups */ |
| 1555 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1556 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
| 1557 | struct task_struct *, const void *); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1558 | |
Eric W. Biederman | 1c0d04c | 2006-10-02 02:18:57 -0700 | [diff] [blame] | 1559 | /* |
| 1560 | * Fill a directory entry. |
| 1561 | * |
| 1562 | * If possible create the dcache entry and derive our inode number and |
| 1563 | * file type from dcache entry. |
| 1564 | * |
| 1565 | * Since all of the proc inode numbers are dynamically generated, the inode |
| 1566 | * numbers do not exist until the inode is cache. This means creating the |
| 1567 | * the dcache entry in readdir is necessary to keep the inode numbers |
| 1568 | * reported by readdir in sync with the inode numbers reported |
| 1569 | * by stat. |
| 1570 | */ |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1571 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 1572 | char *name, int len, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1573 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1574 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1575 | struct dentry *child, *dir = filp->f_path.dentry; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1576 | struct inode *inode; |
| 1577 | struct qstr qname; |
| 1578 | ino_t ino = 0; |
| 1579 | unsigned type = DT_UNKNOWN; |
| 1580 | |
| 1581 | qname.name = name; |
| 1582 | qname.len = len; |
| 1583 | qname.hash = full_name_hash(name, len); |
| 1584 | |
| 1585 | child = d_lookup(dir, &qname); |
| 1586 | if (!child) { |
| 1587 | struct dentry *new; |
| 1588 | new = d_alloc(dir, &qname); |
| 1589 | if (new) { |
| 1590 | child = instantiate(dir->d_inode, new, task, ptr); |
| 1591 | if (child) |
| 1592 | dput(new); |
| 1593 | else |
| 1594 | child = new; |
| 1595 | } |
| 1596 | } |
| 1597 | if (!child || IS_ERR(child) || !child->d_inode) |
| 1598 | goto end_instantiate; |
| 1599 | inode = child->d_inode; |
| 1600 | if (inode) { |
| 1601 | ino = inode->i_ino; |
| 1602 | type = inode->i_mode >> 12; |
| 1603 | } |
| 1604 | dput(child); |
| 1605 | end_instantiate: |
| 1606 | if (!ino) |
| 1607 | ino = find_inode_number(dir, &qname); |
| 1608 | if (!ino) |
| 1609 | ino = 1; |
| 1610 | return filldir(dirent, name, len, filp->f_pos, ino, type); |
| 1611 | } |
| 1612 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1613 | static unsigned name_to_int(struct dentry *dentry) |
| 1614 | { |
| 1615 | const char *name = dentry->d_name.name; |
| 1616 | int len = dentry->d_name.len; |
| 1617 | unsigned n = 0; |
| 1618 | |
| 1619 | if (len > 1 && *name == '0') |
| 1620 | goto out; |
| 1621 | while (len-- > 0) { |
| 1622 | unsigned c = *name++ - '0'; |
| 1623 | if (c > 9) |
| 1624 | goto out; |
| 1625 | if (n >= (~0U-9)/10) |
| 1626 | goto out; |
| 1627 | n *= 10; |
| 1628 | n += c; |
| 1629 | } |
| 1630 | return n; |
| 1631 | out: |
| 1632 | return ~0U; |
| 1633 | } |
| 1634 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1635 | #define PROC_FDINFO_MAX 64 |
| 1636 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1637 | 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] | 1638 | { |
| 1639 | struct task_struct *task = get_proc_task(inode); |
| 1640 | struct files_struct *files = NULL; |
| 1641 | struct file *file; |
| 1642 | int fd = proc_fd(inode); |
| 1643 | |
| 1644 | if (task) { |
| 1645 | files = get_files_struct(task); |
| 1646 | put_task_struct(task); |
| 1647 | } |
| 1648 | if (files) { |
| 1649 | /* |
| 1650 | * We are not taking a ref to the file structure, so we must |
| 1651 | * hold ->file_lock. |
| 1652 | */ |
| 1653 | spin_lock(&files->file_lock); |
| 1654 | file = fcheck_files(files, fd); |
| 1655 | if (file) { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1656 | if (path) { |
| 1657 | *path = file->f_path; |
| 1658 | path_get(&file->f_path); |
| 1659 | } |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1660 | if (info) |
| 1661 | snprintf(info, PROC_FDINFO_MAX, |
| 1662 | "pos:\t%lli\n" |
| 1663 | "flags:\t0%o\n", |
| 1664 | (long long) file->f_pos, |
| 1665 | file->f_flags); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1666 | spin_unlock(&files->file_lock); |
| 1667 | put_files_struct(files); |
| 1668 | return 0; |
| 1669 | } |
| 1670 | spin_unlock(&files->file_lock); |
| 1671 | put_files_struct(files); |
| 1672 | } |
| 1673 | return -ENOENT; |
| 1674 | } |
| 1675 | |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1676 | static int proc_fd_link(struct inode *inode, struct path *path) |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1677 | { |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1678 | return proc_fd_info(inode, path, NULL); |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1679 | } |
| 1680 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1681 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1682 | { |
| 1683 | struct inode *inode = dentry->d_inode; |
| 1684 | struct task_struct *task = get_proc_task(inode); |
| 1685 | int fd = proc_fd(inode); |
| 1686 | struct files_struct *files; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1687 | const struct cred *cred; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1688 | |
| 1689 | if (task) { |
| 1690 | files = get_files_struct(task); |
| 1691 | if (files) { |
| 1692 | rcu_read_lock(); |
| 1693 | if (fcheck_files(files, fd)) { |
| 1694 | rcu_read_unlock(); |
| 1695 | put_files_struct(files); |
| 1696 | if (task_dumpable(task)) { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1697 | rcu_read_lock(); |
| 1698 | cred = __task_cred(task); |
| 1699 | inode->i_uid = cred->euid; |
| 1700 | inode->i_gid = cred->egid; |
| 1701 | rcu_read_unlock(); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1702 | } else { |
| 1703 | inode->i_uid = 0; |
| 1704 | inode->i_gid = 0; |
| 1705 | } |
| 1706 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
| 1707 | security_task_to_inode(task, inode); |
| 1708 | put_task_struct(task); |
| 1709 | return 1; |
| 1710 | } |
| 1711 | rcu_read_unlock(); |
| 1712 | put_files_struct(files); |
| 1713 | } |
| 1714 | put_task_struct(task); |
| 1715 | } |
| 1716 | d_drop(dentry); |
| 1717 | return 0; |
| 1718 | } |
| 1719 | |
| 1720 | static struct dentry_operations tid_fd_dentry_operations = |
| 1721 | { |
| 1722 | .d_revalidate = tid_fd_revalidate, |
| 1723 | .d_delete = pid_delete_dentry, |
| 1724 | }; |
| 1725 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1726 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1727 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1728 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1729 | unsigned fd = *(const unsigned *)ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1730 | struct file *file; |
| 1731 | struct files_struct *files; |
| 1732 | struct inode *inode; |
| 1733 | struct proc_inode *ei; |
| 1734 | struct dentry *error = ERR_PTR(-ENOENT); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1735 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1736 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1737 | if (!inode) |
| 1738 | goto out; |
| 1739 | ei = PROC_I(inode); |
| 1740 | ei->fd = fd; |
| 1741 | files = get_files_struct(task); |
| 1742 | if (!files) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1743 | goto out_iput; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1744 | inode->i_mode = S_IFLNK; |
| 1745 | |
| 1746 | /* |
| 1747 | * We are not taking a ref to the file structure, so we must |
| 1748 | * hold ->file_lock. |
| 1749 | */ |
| 1750 | spin_lock(&files->file_lock); |
| 1751 | file = fcheck_files(files, fd); |
| 1752 | if (!file) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1753 | goto out_unlock; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1754 | if (file->f_mode & FMODE_READ) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1755 | inode->i_mode |= S_IRUSR | S_IXUSR; |
Al Viro | aeb5d72 | 2008-09-02 15:28:45 -0400 | [diff] [blame] | 1756 | if (file->f_mode & FMODE_WRITE) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1757 | inode->i_mode |= S_IWUSR | S_IXUSR; |
| 1758 | spin_unlock(&files->file_lock); |
| 1759 | put_files_struct(files); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1760 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1761 | inode->i_op = &proc_pid_link_inode_operations; |
| 1762 | inode->i_size = 64; |
| 1763 | ei->op.proc_get_link = proc_fd_link; |
| 1764 | dentry->d_op = &tid_fd_dentry_operations; |
| 1765 | d_add(dentry, inode); |
| 1766 | /* Close the race of the process dying before we return the dentry */ |
| 1767 | if (tid_fd_revalidate(dentry, NULL)) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1768 | error = NULL; |
| 1769 | |
| 1770 | out: |
| 1771 | return error; |
| 1772 | out_unlock: |
| 1773 | spin_unlock(&files->file_lock); |
| 1774 | put_files_struct(files); |
| 1775 | out_iput: |
| 1776 | iput(inode); |
| 1777 | goto out; |
| 1778 | } |
| 1779 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1780 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
| 1781 | struct dentry *dentry, |
| 1782 | instantiate_t instantiate) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1783 | { |
| 1784 | struct task_struct *task = get_proc_task(dir); |
| 1785 | unsigned fd = name_to_int(dentry); |
| 1786 | struct dentry *result = ERR_PTR(-ENOENT); |
| 1787 | |
| 1788 | if (!task) |
| 1789 | goto out_no_task; |
| 1790 | if (fd == ~0U) |
| 1791 | goto out; |
| 1792 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1793 | result = instantiate(dir, dentry, task, &fd); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1794 | out: |
| 1795 | put_task_struct(task); |
| 1796 | out_no_task: |
| 1797 | return result; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 1798 | } |
| 1799 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1800 | static int proc_readfd_common(struct file * filp, void * dirent, |
| 1801 | filldir_t filldir, instantiate_t instantiate) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 1803 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 1804 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1805 | struct task_struct *p = get_proc_task(inode); |
Pavel Emelyanov | 457c251 | 2007-10-18 23:40:43 -0700 | [diff] [blame] | 1806 | unsigned int fd, ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | struct files_struct * files; |
| 1809 | |
| 1810 | retval = -ENOENT; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1811 | if (!p) |
| 1812 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | |
| 1815 | fd = filp->f_pos; |
| 1816 | switch (fd) { |
| 1817 | case 0: |
| 1818 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) |
| 1819 | goto out; |
| 1820 | filp->f_pos++; |
| 1821 | case 1: |
Eric W. Biederman | 5634708 | 2006-06-26 00:25:40 -0700 | [diff] [blame] | 1822 | ino = parent_ino(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) |
| 1824 | goto out; |
| 1825 | filp->f_pos++; |
| 1826 | default: |
| 1827 | files = get_files_struct(p); |
| 1828 | if (!files) |
| 1829 | goto out; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1830 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | for (fd = filp->f_pos-2; |
Al Viro | 9b4f526 | 2008-04-22 01:32:44 -0400 | [diff] [blame] | 1832 | fd < files_fdtable(files)->max_fds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | fd++, filp->f_pos++) { |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1834 | char name[PROC_NUMBUF]; |
| 1835 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | |
| 1837 | if (!fcheck_files(files, fd)) |
| 1838 | continue; |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1839 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1840 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1841 | len = snprintf(name, sizeof(name), "%d", fd); |
| 1842 | if (proc_fill_cache(filp, dirent, filldir, |
| 1843 | name, len, instantiate, |
| 1844 | p, &fd) < 0) { |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1845 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1846 | break; |
| 1847 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1848 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | } |
Dipankar Sarma | b835996 | 2005-09-09 13:04:14 -0700 | [diff] [blame] | 1850 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | put_files_struct(files); |
| 1852 | } |
| 1853 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 1854 | put_task_struct(p); |
| 1855 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | return retval; |
| 1857 | } |
| 1858 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1859 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
| 1860 | struct nameidata *nd) |
| 1861 | { |
| 1862 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); |
| 1863 | } |
| 1864 | |
| 1865 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) |
| 1866 | { |
| 1867 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); |
| 1868 | } |
| 1869 | |
| 1870 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, |
| 1871 | size_t len, loff_t *ppos) |
| 1872 | { |
| 1873 | char tmp[PROC_FDINFO_MAX]; |
Jan Blunck | 3dcd25f | 2008-02-14 19:38:35 -0800 | [diff] [blame] | 1874 | 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] | 1875 | if (!err) |
| 1876 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); |
| 1877 | return err; |
| 1878 | } |
| 1879 | |
| 1880 | static const struct file_operations proc_fdinfo_file_operations = { |
| 1881 | .open = nonseekable_open, |
| 1882 | .read = proc_fdinfo_read, |
| 1883 | }; |
| 1884 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 1885 | static const struct file_operations proc_fd_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | .read = generic_read_dir, |
| 1887 | .readdir = proc_readfd, |
| 1888 | }; |
| 1889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | /* |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 1891 | * /proc/pid/fd needs a special permission handler so that a process can still |
| 1892 | * access /proc/self/fd after it has executed a setuid(). |
| 1893 | */ |
Al Viro | e6305c4 | 2008-07-15 21:03:57 -0400 | [diff] [blame] | 1894 | static int proc_fd_permission(struct inode *inode, int mask) |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 1895 | { |
| 1896 | int rv; |
| 1897 | |
| 1898 | rv = generic_permission(inode, mask, NULL); |
| 1899 | if (rv == 0) |
| 1900 | return 0; |
| 1901 | if (task_pid(current) == proc_pid(inode)) |
| 1902 | rv = 0; |
| 1903 | return rv; |
| 1904 | } |
| 1905 | |
| 1906 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | * proc directories can do almost nothing.. |
| 1908 | */ |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1909 | static const struct inode_operations proc_fd_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | .lookup = proc_lookupfd, |
Alexey Dobriyan | 8948e11 | 2007-05-08 00:23:35 -0700 | [diff] [blame] | 1911 | .permission = proc_fd_permission, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 1912 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | }; |
| 1914 | |
Miklos Szeredi | 2793274 | 2007-05-08 00:26:17 -0700 | [diff] [blame] | 1915 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
| 1916 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
| 1917 | { |
| 1918 | unsigned fd = *(unsigned *)ptr; |
| 1919 | struct inode *inode; |
| 1920 | struct proc_inode *ei; |
| 1921 | struct dentry *error = ERR_PTR(-ENOENT); |
| 1922 | |
| 1923 | inode = proc_pid_make_inode(dir->i_sb, task); |
| 1924 | if (!inode) |
| 1925 | goto out; |
| 1926 | ei = PROC_I(inode); |
| 1927 | ei->fd = fd; |
| 1928 | inode->i_mode = S_IFREG | S_IRUSR; |
| 1929 | inode->i_fop = &proc_fdinfo_file_operations; |
| 1930 | dentry->d_op = &tid_fd_dentry_operations; |
| 1931 | d_add(dentry, inode); |
| 1932 | /* Close the race of the process dying before we return the dentry */ |
| 1933 | if (tid_fd_revalidate(dentry, NULL)) |
| 1934 | error = NULL; |
| 1935 | |
| 1936 | out: |
| 1937 | return error; |
| 1938 | } |
| 1939 | |
| 1940 | static struct dentry *proc_lookupfdinfo(struct inode *dir, |
| 1941 | struct dentry *dentry, |
| 1942 | struct nameidata *nd) |
| 1943 | { |
| 1944 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); |
| 1945 | } |
| 1946 | |
| 1947 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) |
| 1948 | { |
| 1949 | return proc_readfd_common(filp, dirent, filldir, |
| 1950 | proc_fdinfo_instantiate); |
| 1951 | } |
| 1952 | |
| 1953 | static const struct file_operations proc_fdinfo_operations = { |
| 1954 | .read = generic_read_dir, |
| 1955 | .readdir = proc_readfdinfo, |
| 1956 | }; |
| 1957 | |
| 1958 | /* |
| 1959 | * proc directories can do almost nothing.. |
| 1960 | */ |
| 1961 | static const struct inode_operations proc_fdinfo_inode_operations = { |
| 1962 | .lookup = proc_lookupfdinfo, |
| 1963 | .setattr = proc_setattr, |
| 1964 | }; |
| 1965 | |
| 1966 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1967 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1968 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1969 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1970 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1971 | struct inode *inode; |
| 1972 | struct proc_inode *ei; |
| 1973 | struct dentry *error = ERR_PTR(-EINVAL); |
| 1974 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1975 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 1976 | if (!inode) |
| 1977 | goto out; |
| 1978 | |
| 1979 | ei = PROC_I(inode); |
| 1980 | inode->i_mode = p->mode; |
| 1981 | if (S_ISDIR(inode->i_mode)) |
| 1982 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ |
| 1983 | if (p->iop) |
| 1984 | inode->i_op = p->iop; |
| 1985 | if (p->fop) |
| 1986 | inode->i_fop = p->fop; |
| 1987 | ei->op = p->op; |
| 1988 | dentry->d_op = &pid_dentry_operations; |
| 1989 | d_add(dentry, inode); |
| 1990 | /* Close the race of the process dying before we return the dentry */ |
| 1991 | if (pid_revalidate(dentry, NULL)) |
| 1992 | error = NULL; |
| 1993 | out: |
| 1994 | return error; |
| 1995 | } |
| 1996 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | static struct dentry *proc_pident_lookup(struct inode *dir, |
| 1998 | struct dentry *dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 1999 | const struct pid_entry *ents, |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2000 | unsigned int nents) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2002 | struct dentry *error; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2003 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2004 | const struct pid_entry *p, *last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2006 | error = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2008 | if (!task) |
| 2009 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2011 | /* |
| 2012 | * Yes, it does not scale. And it should not. Don't add |
| 2013 | * new entries into /proc/<tgid>/ without very good reasons. |
| 2014 | */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2015 | last = &ents[nents - 1]; |
| 2016 | for (p = ents; p <= last; p++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | if (p->len != dentry->d_name.len) |
| 2018 | continue; |
| 2019 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2020 | break; |
| 2021 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2022 | if (p > last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | goto out; |
| 2024 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2025 | error = proc_pident_instantiate(dir, dentry, task, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | out: |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2027 | put_task_struct(task); |
| 2028 | out_no_task: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2029 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | } |
| 2031 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2032 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
| 2033 | 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] | 2034 | { |
| 2035 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2036 | proc_pident_instantiate, task, p); |
| 2037 | } |
| 2038 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2039 | static int proc_pident_readdir(struct file *filp, |
| 2040 | void *dirent, filldir_t filldir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2041 | const struct pid_entry *ents, unsigned int nents) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2042 | { |
| 2043 | int i; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2044 | struct dentry *dentry = filp->f_path.dentry; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2045 | struct inode *inode = dentry->d_inode; |
| 2046 | struct task_struct *task = get_proc_task(inode); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2047 | const struct pid_entry *p, *last; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2048 | ino_t ino; |
| 2049 | int ret; |
| 2050 | |
| 2051 | ret = -ENOENT; |
| 2052 | if (!task) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2053 | goto out_no_task; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2054 | |
| 2055 | ret = 0; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2056 | i = filp->f_pos; |
| 2057 | switch (i) { |
| 2058 | case 0: |
| 2059 | ino = inode->i_ino; |
| 2060 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) |
| 2061 | goto out; |
| 2062 | i++; |
| 2063 | filp->f_pos++; |
| 2064 | /* fall through */ |
| 2065 | case 1: |
| 2066 | ino = parent_ino(dentry); |
| 2067 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) |
| 2068 | goto out; |
| 2069 | i++; |
| 2070 | filp->f_pos++; |
| 2071 | /* fall through */ |
| 2072 | default: |
| 2073 | i -= 2; |
| 2074 | if (i >= nents) { |
| 2075 | ret = 1; |
| 2076 | goto out; |
| 2077 | } |
| 2078 | p = ents + i; |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2079 | last = &ents[nents - 1]; |
| 2080 | while (p <= last) { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2081 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2082 | goto out; |
| 2083 | filp->f_pos++; |
| 2084 | p++; |
| 2085 | } |
| 2086 | } |
| 2087 | |
| 2088 | ret = 1; |
| 2089 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2090 | put_task_struct(task); |
| 2091 | out_no_task: |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2092 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | } |
| 2094 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | #ifdef CONFIG_SECURITY |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2096 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, |
| 2097 | size_t count, loff_t *ppos) |
| 2098 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2099 | struct inode * inode = file->f_path.dentry->d_inode; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2100 | char *p = NULL; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2101 | ssize_t length; |
| 2102 | struct task_struct *task = get_proc_task(inode); |
| 2103 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2104 | if (!task) |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2105 | return -ESRCH; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2106 | |
| 2107 | length = security_getprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2108 | (char*)file->f_path.dentry->d_name.name, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2109 | &p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2110 | put_task_struct(task); |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 2111 | if (length > 0) |
| 2112 | length = simple_read_from_buffer(buf, count, ppos, p, length); |
| 2113 | kfree(p); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2114 | return length; |
| 2115 | } |
| 2116 | |
| 2117 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
| 2118 | size_t count, loff_t *ppos) |
| 2119 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2120 | struct inode * inode = file->f_path.dentry->d_inode; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2121 | char *page; |
| 2122 | ssize_t length; |
| 2123 | struct task_struct *task = get_proc_task(inode); |
| 2124 | |
| 2125 | length = -ESRCH; |
| 2126 | if (!task) |
| 2127 | goto out_no_task; |
| 2128 | if (count > PAGE_SIZE) |
| 2129 | count = PAGE_SIZE; |
| 2130 | |
| 2131 | /* No partial writes. */ |
| 2132 | length = -EINVAL; |
| 2133 | if (*ppos != 0) |
| 2134 | goto out; |
| 2135 | |
| 2136 | length = -ENOMEM; |
Mel Gorman | e12ba74 | 2007-10-16 01:25:52 -0700 | [diff] [blame] | 2137 | page = (char*)__get_free_page(GFP_TEMPORARY); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2138 | if (!page) |
| 2139 | goto out; |
| 2140 | |
| 2141 | length = -EFAULT; |
| 2142 | if (copy_from_user(page, buf, count)) |
| 2143 | goto out_free; |
| 2144 | |
| 2145 | length = security_setprocattr(task, |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2146 | (char*)file->f_path.dentry->d_name.name, |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2147 | (void*)page, count); |
| 2148 | out_free: |
| 2149 | free_page((unsigned long) page); |
| 2150 | out: |
| 2151 | put_task_struct(task); |
| 2152 | out_no_task: |
| 2153 | return length; |
| 2154 | } |
| 2155 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2156 | static const struct file_operations proc_pid_attr_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2157 | .read = proc_pid_attr_read, |
| 2158 | .write = proc_pid_attr_write, |
| 2159 | }; |
| 2160 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2161 | static const struct pid_entry attr_dir_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2162 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2163 | REG("prev", S_IRUGO, proc_pid_attr_operations), |
| 2164 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2165 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2166 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
| 2167 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2168 | }; |
| 2169 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2170 | static int proc_attr_dir_readdir(struct file * filp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | void * dirent, filldir_t filldir) |
| 2172 | { |
| 2173 | return proc_pident_readdir(filp,dirent,filldir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2174 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | } |
| 2176 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2177 | static const struct file_operations proc_attr_dir_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | .read = generic_read_dir, |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2179 | .readdir = proc_attr_dir_readdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | }; |
| 2181 | |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2182 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | struct dentry *dentry, struct nameidata *nd) |
| 2184 | { |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2185 | return proc_pident_lookup(dir, dentry, |
| 2186 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | } |
| 2188 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2189 | static const struct inode_operations proc_attr_dir_inode_operations = { |
Eric W. Biederman | 72d9dcf | 2006-10-02 02:18:50 -0700 | [diff] [blame] | 2190 | .lookup = proc_attr_dir_lookup, |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 2191 | .getattr = pid_getattr, |
Linus Torvalds | 6d76fa5 | 2006-07-15 12:26:45 -0700 | [diff] [blame] | 2192 | .setattr = proc_setattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | }; |
| 2194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | #endif |
| 2196 | |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2197 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
| 2198 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
| 2199 | size_t count, loff_t *ppos) |
| 2200 | { |
| 2201 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
| 2202 | struct mm_struct *mm; |
| 2203 | char buffer[PROC_NUMBUF]; |
| 2204 | size_t len; |
| 2205 | int ret; |
| 2206 | |
| 2207 | if (!task) |
| 2208 | return -ESRCH; |
| 2209 | |
| 2210 | ret = 0; |
| 2211 | mm = get_task_mm(task); |
| 2212 | if (mm) { |
| 2213 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", |
| 2214 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> |
| 2215 | MMF_DUMP_FILTER_SHIFT)); |
| 2216 | mmput(mm); |
| 2217 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); |
| 2218 | } |
| 2219 | |
| 2220 | put_task_struct(task); |
| 2221 | |
| 2222 | return ret; |
| 2223 | } |
| 2224 | |
| 2225 | static ssize_t proc_coredump_filter_write(struct file *file, |
| 2226 | const char __user *buf, |
| 2227 | size_t count, |
| 2228 | loff_t *ppos) |
| 2229 | { |
| 2230 | struct task_struct *task; |
| 2231 | struct mm_struct *mm; |
| 2232 | char buffer[PROC_NUMBUF], *end; |
| 2233 | unsigned int val; |
| 2234 | int ret; |
| 2235 | int i; |
| 2236 | unsigned long mask; |
| 2237 | |
| 2238 | ret = -EFAULT; |
| 2239 | memset(buffer, 0, sizeof(buffer)); |
| 2240 | if (count > sizeof(buffer) - 1) |
| 2241 | count = sizeof(buffer) - 1; |
| 2242 | if (copy_from_user(buffer, buf, count)) |
| 2243 | goto out_no_task; |
| 2244 | |
| 2245 | ret = -EINVAL; |
| 2246 | val = (unsigned int)simple_strtoul(buffer, &end, 0); |
| 2247 | if (*end == '\n') |
| 2248 | end++; |
| 2249 | if (end - buffer == 0) |
| 2250 | goto out_no_task; |
| 2251 | |
| 2252 | ret = -ESRCH; |
| 2253 | task = get_proc_task(file->f_dentry->d_inode); |
| 2254 | if (!task) |
| 2255 | goto out_no_task; |
| 2256 | |
| 2257 | ret = end - buffer; |
| 2258 | mm = get_task_mm(task); |
| 2259 | if (!mm) |
| 2260 | goto out_no_mm; |
| 2261 | |
| 2262 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { |
| 2263 | if (val & mask) |
| 2264 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2265 | else |
| 2266 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); |
| 2267 | } |
| 2268 | |
| 2269 | mmput(mm); |
| 2270 | out_no_mm: |
| 2271 | put_task_struct(task); |
| 2272 | out_no_task: |
| 2273 | return ret; |
| 2274 | } |
| 2275 | |
| 2276 | static const struct file_operations proc_coredump_filter_operations = { |
| 2277 | .read = proc_coredump_filter_read, |
| 2278 | .write = proc_coredump_filter_write, |
| 2279 | }; |
| 2280 | #endif |
| 2281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | /* |
| 2283 | * /proc/self: |
| 2284 | */ |
| 2285 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, |
| 2286 | int buflen) |
| 2287 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2288 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2289 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2290 | char tmp[PROC_NUMBUF]; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2291 | if (!tgid) |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2292 | return -ENOENT; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2293 | sprintf(tmp, "%d", tgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | return vfs_readlink(dentry,buffer,buflen,tmp); |
| 2295 | } |
| 2296 | |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 2297 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2298 | { |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2299 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2300 | pid_t tgid = task_tgid_nr_ns(current, ns); |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2301 | char tmp[PROC_NUMBUF]; |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2302 | if (!tgid) |
Eric W. Biederman | 488e5bc | 2008-02-08 04:18:34 -0800 | [diff] [blame] | 2303 | return ERR_PTR(-ENOENT); |
Andrew Morton | b55fcb2 | 2008-02-08 15:00:43 -0800 | [diff] [blame] | 2304 | sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 2305 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2306 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2308 | static const struct inode_operations proc_self_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | .readlink = proc_self_readlink, |
| 2310 | .follow_link = proc_self_follow_link, |
| 2311 | }; |
| 2312 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2313 | /* |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2314 | * proc base |
| 2315 | * |
| 2316 | * These are the directory entries in the root directory of /proc |
| 2317 | * that properly belong to the /proc filesystem, as they describe |
| 2318 | * describe something that is process related. |
| 2319 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2320 | static const struct pid_entry proc_base_stuff[] = { |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2321 | NOD("self", S_IFLNK|S_IRWXUGO, |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2322 | &proc_self_inode_operations, NULL, {}), |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2323 | }; |
| 2324 | |
| 2325 | /* |
| 2326 | * Exceptional case: normally we are not allowed to unhash a busy |
| 2327 | * directory. In this case, however, we can do it - no aliasing problems |
| 2328 | * due to the way we treat inodes. |
| 2329 | */ |
| 2330 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 2331 | { |
| 2332 | struct inode *inode = dentry->d_inode; |
| 2333 | struct task_struct *task = get_proc_task(inode); |
| 2334 | if (task) { |
| 2335 | put_task_struct(task); |
| 2336 | return 1; |
| 2337 | } |
| 2338 | d_drop(dentry); |
| 2339 | return 0; |
| 2340 | } |
| 2341 | |
| 2342 | static struct dentry_operations proc_base_dentry_operations = |
| 2343 | { |
| 2344 | .d_revalidate = proc_base_revalidate, |
| 2345 | .d_delete = pid_delete_dentry, |
| 2346 | }; |
| 2347 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2348 | static struct dentry *proc_base_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2349 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2350 | { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2351 | const struct pid_entry *p = ptr; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2352 | struct inode *inode; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2353 | struct proc_inode *ei; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2354 | struct dentry *error = ERR_PTR(-EINVAL); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2355 | |
| 2356 | /* Allocate the inode */ |
| 2357 | error = ERR_PTR(-ENOMEM); |
| 2358 | inode = new_inode(dir->i_sb); |
| 2359 | if (!inode) |
| 2360 | goto out; |
| 2361 | |
| 2362 | /* Initialize the inode */ |
| 2363 | ei = PROC_I(inode); |
| 2364 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2365 | |
| 2366 | /* |
| 2367 | * grab the reference to the task. |
| 2368 | */ |
Oleg Nesterov | 1a657f7 | 2006-10-02 02:18:59 -0700 | [diff] [blame] | 2369 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2370 | if (!ei->pid) |
| 2371 | goto out_iput; |
| 2372 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2373 | inode->i_mode = p->mode; |
| 2374 | if (S_ISDIR(inode->i_mode)) |
| 2375 | inode->i_nlink = 2; |
| 2376 | if (S_ISLNK(inode->i_mode)) |
| 2377 | inode->i_size = 64; |
| 2378 | if (p->iop) |
| 2379 | inode->i_op = p->iop; |
| 2380 | if (p->fop) |
| 2381 | inode->i_fop = p->fop; |
| 2382 | ei->op = p->op; |
| 2383 | dentry->d_op = &proc_base_dentry_operations; |
| 2384 | d_add(dentry, inode); |
| 2385 | error = NULL; |
| 2386 | out: |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2387 | return error; |
| 2388 | out_iput: |
| 2389 | iput(inode); |
| 2390 | goto out; |
| 2391 | } |
| 2392 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2393 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
| 2394 | { |
| 2395 | struct dentry *error; |
| 2396 | struct task_struct *task = get_proc_task(dir); |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2397 | const struct pid_entry *p, *last; |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2398 | |
| 2399 | error = ERR_PTR(-ENOENT); |
| 2400 | |
| 2401 | if (!task) |
| 2402 | goto out_no_task; |
| 2403 | |
| 2404 | /* Lookup the directory entry */ |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2405 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
| 2406 | for (p = proc_base_stuff; p <= last; p++) { |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2407 | if (p->len != dentry->d_name.len) |
| 2408 | continue; |
| 2409 | if (!memcmp(dentry->d_name.name, p->name, p->len)) |
| 2410 | break; |
| 2411 | } |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2412 | if (p > last) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2413 | goto out; |
| 2414 | |
| 2415 | error = proc_base_instantiate(dir, dentry, task, p); |
| 2416 | |
| 2417 | out: |
| 2418 | put_task_struct(task); |
| 2419 | out_no_task: |
| 2420 | return error; |
| 2421 | } |
| 2422 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2423 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
| 2424 | 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] | 2425 | { |
| 2426 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, |
| 2427 | proc_base_instantiate, task, p); |
| 2428 | } |
| 2429 | |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2430 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2431 | 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] | 2432 | { |
Andrea Righi | 940389b | 2008-07-28 00:48:12 +0200 | [diff] [blame] | 2433 | struct task_io_accounting acct = task->ioac; |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2434 | unsigned long flags; |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2435 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2436 | if (whole && lock_task_sighand(task, &flags)) { |
| 2437 | struct task_struct *t = task; |
Andrea Righi | b2d002d | 2008-07-26 15:22:27 -0700 | [diff] [blame] | 2438 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2439 | task_io_accounting_add(&acct, &task->signal->ioac); |
| 2440 | while_each_thread(task, t) |
| 2441 | task_io_accounting_add(&acct, &t->ioac); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2442 | |
Andrea Righi | 5995477 | 2008-07-27 17:29:15 +0200 | [diff] [blame] | 2443 | unlock_task_sighand(task, &flags); |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2444 | } |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2445 | return sprintf(buffer, |
| 2446 | "rchar: %llu\n" |
| 2447 | "wchar: %llu\n" |
| 2448 | "syscr: %llu\n" |
| 2449 | "syscw: %llu\n" |
| 2450 | "read_bytes: %llu\n" |
| 2451 | "write_bytes: %llu\n" |
| 2452 | "cancelled_write_bytes: %llu\n", |
Alexander Beregalov | 7c44319 | 2008-08-05 13:01:34 -0700 | [diff] [blame] | 2453 | (unsigned long long)acct.rchar, |
| 2454 | (unsigned long long)acct.wchar, |
| 2455 | (unsigned long long)acct.syscr, |
| 2456 | (unsigned long long)acct.syscw, |
| 2457 | (unsigned long long)acct.read_bytes, |
| 2458 | (unsigned long long)acct.write_bytes, |
| 2459 | (unsigned long long)acct.cancelled_write_bytes); |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2460 | } |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2461 | |
| 2462 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) |
| 2463 | { |
| 2464 | return do_io_accounting(task, buffer, 0); |
| 2465 | } |
| 2466 | |
| 2467 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) |
| 2468 | { |
| 2469 | return do_io_accounting(task, buffer, 1); |
| 2470 | } |
| 2471 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2472 | |
Kees Cook | 4783072 | 2008-10-06 03:11:58 +0400 | [diff] [blame] | 2473 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
| 2474 | struct pid *pid, struct task_struct *task) |
| 2475 | { |
| 2476 | seq_printf(m, "%08x\n", task->personality); |
| 2477 | return 0; |
| 2478 | } |
| 2479 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2480 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2481 | * Thread groups |
| 2482 | */ |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2483 | static const struct file_operations proc_task_operations; |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2484 | static const struct inode_operations proc_task_inode_operations; |
Eric W. Biederman | 20cdc89 | 2006-10-02 02:17:07 -0700 | [diff] [blame] | 2485 | |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2486 | static const struct pid_entry tgid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2487 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
| 2488 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2489 | 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] | 2490 | #ifdef CONFIG_NET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2491 | 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] | 2492 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2493 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2494 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2495 | ONE("status", S_IRUGO, proc_pid_status), |
| 2496 | ONE("personality", S_IRUSR, proc_pid_personality), |
| 2497 | INF("limits", S_IRUSR, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2498 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2499 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2500 | #endif |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2501 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2502 | INF("syscall", S_IRUSR, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2503 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2504 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2505 | ONE("stat", S_IRUGO, proc_tgid_stat), |
| 2506 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2507 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2508 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2509 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2510 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2511 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2512 | LNK("cwd", proc_cwd_link), |
| 2513 | LNK("root", proc_root_link), |
| 2514 | LNK("exe", proc_exe_link), |
| 2515 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2516 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
| 2517 | REG("mountstats", S_IRUSR, proc_mountstats_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2518 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2519 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2520 | REG("smaps", S_IRUGO, proc_smaps_operations), |
| 2521 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2522 | #endif |
| 2523 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2524 | 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] | 2525 | #endif |
| 2526 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2527 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2528 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2529 | #ifdef CONFIG_STACKTRACE |
| 2530 | ONE("stack", S_IRUSR, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2531 | #endif |
| 2532 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2533 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2534 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2535 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2536 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2537 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2538 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2539 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2540 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2541 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2542 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2543 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2544 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2545 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2546 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2547 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2548 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2549 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2550 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2551 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2552 | #endif |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2553 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2554 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
Kawai, Hidehiro | 3cb4a0b | 2007-07-19 01:48:28 -0700 | [diff] [blame] | 2555 | #endif |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2556 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2557 | INF("io", S_IRUGO, proc_tgid_io_accounting), |
Andrew Morton | aba76fd | 2006-12-10 02:19:48 -0800 | [diff] [blame] | 2558 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2559 | }; |
| 2560 | |
| 2561 | static int proc_tgid_base_readdir(struct file * filp, |
| 2562 | void * dirent, filldir_t filldir) |
| 2563 | { |
| 2564 | return proc_pident_readdir(filp,dirent,filldir, |
| 2565 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
| 2566 | } |
| 2567 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2568 | static const struct file_operations proc_tgid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2569 | .read = generic_read_dir, |
| 2570 | .readdir = proc_tgid_base_readdir, |
| 2571 | }; |
| 2572 | |
| 2573 | 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] | 2574 | return proc_pident_lookup(dir, dentry, |
| 2575 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2576 | } |
| 2577 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2578 | static const struct inode_operations proc_tgid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2579 | .lookup = proc_tgid_base_lookup, |
| 2580 | .getattr = pid_getattr, |
| 2581 | .setattr = proc_setattr, |
| 2582 | }; |
| 2583 | |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2584 | 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] | 2585 | { |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2586 | struct dentry *dentry, *leader, *dir; |
Eric W. Biederman | 8578cea | 2006-06-26 00:25:54 -0700 | [diff] [blame] | 2587 | char buf[PROC_NUMBUF]; |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2588 | struct qstr name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2589 | |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2590 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2591 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
| 2592 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2593 | if (dentry) { |
Andrea Arcangeli | 7766755 | 2008-02-04 22:29:21 -0800 | [diff] [blame] | 2594 | if (!(current->flags & PF_EXITING)) |
| 2595 | shrink_dcache_parent(dentry); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2596 | d_drop(dentry); |
| 2597 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2598 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2600 | if (tgid == 0) |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2601 | goto out; |
| 2602 | |
| 2603 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2604 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
| 2605 | leader = d_hash_and_lookup(mnt->mnt_root, &name); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2606 | if (!leader) |
| 2607 | goto out; |
| 2608 | |
| 2609 | name.name = "task"; |
| 2610 | name.len = strlen(name.name); |
| 2611 | dir = d_hash_and_lookup(leader, &name); |
| 2612 | if (!dir) |
| 2613 | goto out_put_leader; |
| 2614 | |
| 2615 | name.name = buf; |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2616 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2617 | dentry = d_hash_and_lookup(dir, &name); |
| 2618 | if (dentry) { |
| 2619 | shrink_dcache_parent(dentry); |
| 2620 | d_drop(dentry); |
| 2621 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2622 | } |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2623 | |
| 2624 | dput(dir); |
| 2625 | out_put_leader: |
| 2626 | dput(leader); |
| 2627 | out: |
| 2628 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | } |
| 2630 | |
Randy Dunlap | 0895e91 | 2007-10-21 21:00:10 -0700 | [diff] [blame] | 2631 | /** |
| 2632 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
| 2633 | * @task: task that should be flushed. |
| 2634 | * |
| 2635 | * When flushing dentries from proc, one needs to flush them from global |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2636 | * 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] | 2637 | * in. This call is supposed to do all of this job. |
| 2638 | * |
| 2639 | * Looks in the dcache for |
| 2640 | * /proc/@pid |
| 2641 | * /proc/@tgid/task/@pid |
| 2642 | * if either directory is present flushes it and all of it'ts children |
| 2643 | * from the dcache. |
| 2644 | * |
| 2645 | * It is safe and reasonable to cache /proc entries for a task until |
| 2646 | * that task exits. After that they just clog up the dcache with |
| 2647 | * useless entries, possibly causing useful dcache entries to be |
| 2648 | * flushed instead. This routine is proved to flush those useless |
| 2649 | * dcache entries at process exit time. |
| 2650 | * |
| 2651 | * NOTE: This routine is just an optimization so it does not guarantee |
| 2652 | * that no dcache entries will exist at process exit time it |
| 2653 | * just makes it very unlikely that any will persist. |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2654 | */ |
| 2655 | |
| 2656 | void proc_flush_task(struct task_struct *task) |
| 2657 | { |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2658 | int i; |
| 2659 | struct pid *pid, *tgid = NULL; |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2660 | struct upid *upid; |
| 2661 | |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2662 | pid = task_pid(task); |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2663 | if (thread_group_leader(task)) |
| 2664 | tgid = task_tgid(task); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2665 | |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2666 | for (i = 0; i <= pid->level; i++) { |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2667 | upid = &pid->numbers[i]; |
| 2668 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, |
Eric W. Biederman | 9fcc2d1 | 2007-11-14 17:00:07 -0800 | [diff] [blame] | 2669 | tgid ? tgid->numbers[i].nr : 0); |
Pavel Emelyanov | 130f77e | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2670 | } |
Pavel Emelyanov | 6f4e643 | 2007-10-18 23:40:11 -0700 | [diff] [blame] | 2671 | |
| 2672 | upid = &pid->numbers[pid->level]; |
| 2673 | if (upid->nr == 1) |
| 2674 | pid_ns_release_proc(upid->ns); |
Pavel Emelyanov | 60347f6 | 2007-10-18 23:40:03 -0700 | [diff] [blame] | 2675 | } |
| 2676 | |
Adrian Bunk | 9711ef9 | 2006-12-06 20:38:31 -0800 | [diff] [blame] | 2677 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
| 2678 | struct dentry * dentry, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2679 | struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2680 | { |
| 2681 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2682 | struct inode *inode; |
| 2683 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2684 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2685 | if (!inode) |
| 2686 | goto out; |
| 2687 | |
| 2688 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 2689 | inode->i_op = &proc_tgid_base_inode_operations; |
| 2690 | inode->i_fop = &proc_tgid_base_operations; |
| 2691 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 2692 | |
| 2693 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, |
| 2694 | ARRAY_SIZE(tgid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2695 | |
| 2696 | dentry->d_op = &pid_dentry_operations; |
| 2697 | |
| 2698 | d_add(dentry, inode); |
| 2699 | /* Close the race of the process dying before we return the dentry */ |
| 2700 | if (pid_revalidate(dentry, NULL)) |
| 2701 | error = NULL; |
| 2702 | out: |
| 2703 | return error; |
| 2704 | } |
| 2705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2706 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 2707 | { |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2708 | struct dentry *result = ERR_PTR(-ENOENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2710 | unsigned tgid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2711 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2712 | |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2713 | result = proc_base_lookup(dir, dentry); |
| 2714 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) |
| 2715 | goto out; |
| 2716 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2717 | tgid = name_to_int(dentry); |
| 2718 | if (tgid == ~0U) |
| 2719 | goto out; |
| 2720 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2721 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2722 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2723 | task = find_task_by_pid_ns(tgid, ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2724 | if (task) |
| 2725 | get_task_struct(task); |
Eric W. Biederman | de75873 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2726 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2727 | if (!task) |
| 2728 | goto out; |
| 2729 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2730 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 48e6484 | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 2731 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2732 | out: |
Eric W. Biederman | cd6a3ce | 2006-06-26 00:25:49 -0700 | [diff] [blame] | 2733 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2734 | } |
| 2735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2736 | /* |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2737 | * Find the first task with tgid >= tgid |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2738 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2739 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2740 | struct tgid_iter { |
| 2741 | unsigned int tgid; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2742 | struct task_struct *task; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2743 | }; |
| 2744 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) |
| 2745 | { |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2746 | struct pid *pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2747 | |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2748 | if (iter.task) |
| 2749 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2750 | rcu_read_lock(); |
| 2751 | retry: |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2752 | iter.task = NULL; |
| 2753 | pid = find_ge_pid(iter.tgid, ns); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2754 | if (pid) { |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2755 | iter.tgid = pid_nr_ns(pid, ns); |
| 2756 | iter.task = pid_task(pid, PIDTYPE_PID); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2757 | /* What we to know is if the pid we have find is the |
| 2758 | * pid of a thread_group_leader. Testing for task |
| 2759 | * being a thread_group_leader is the obvious thing |
| 2760 | * todo but there is a window when it fails, due to |
| 2761 | * the pid transfer logic in de_thread. |
| 2762 | * |
| 2763 | * So we perform the straight forward test of seeing |
| 2764 | * if the pid we have found is the pid of a thread |
| 2765 | * group leader, and don't worry if the task we have |
| 2766 | * found doesn't happen to be a thread group leader. |
| 2767 | * As we don't care in the case of readdir. |
| 2768 | */ |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2769 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
| 2770 | iter.tgid += 1; |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2771 | goto retry; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2772 | } |
| 2773 | get_task_struct(iter.task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | } |
Eric W. Biederman | 454cc10 | 2006-06-26 00:25:51 -0700 | [diff] [blame] | 2775 | rcu_read_unlock(); |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2776 | return iter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2777 | } |
| 2778 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2779 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2780 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2781 | 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] | 2782 | struct tgid_iter iter) |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2783 | { |
| 2784 | char name[PROC_NUMBUF]; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2785 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2786 | return proc_fill_cache(filp, dirent, filldir, name, len, |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2787 | proc_pid_instantiate, iter.task, NULL); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2788 | } |
| 2789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2790 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
| 2791 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 2792 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 2794 | 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] | 2795 | struct tgid_iter iter; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2796 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2798 | if (!reaper) |
| 2799 | goto out_no_task; |
| 2800 | |
Eric W. Biederman | 7bcd6b0 | 2006-10-02 02:18:56 -0700 | [diff] [blame] | 2801 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2802 | const struct pid_entry *p = &proc_base_stuff[nr]; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2803 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
Eric W. Biederman | 801199c | 2006-10-02 02:18:48 -0700 | [diff] [blame] | 2804 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | } |
| 2806 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2807 | ns = filp->f_dentry->d_sb->s_fs_info; |
Eric W. Biederman | 19fd4bb | 2007-11-28 16:21:26 -0800 | [diff] [blame] | 2808 | iter.task = NULL; |
| 2809 | iter.tgid = filp->f_pos - TGID_OFFSET; |
| 2810 | for (iter = next_tgid(ns, iter); |
| 2811 | iter.task; |
| 2812 | iter.tgid += 1, iter = next_tgid(ns, iter)) { |
| 2813 | filp->f_pos = iter.tgid + TGID_OFFSET; |
| 2814 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { |
| 2815 | put_task_struct(iter.task); |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2816 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2818 | } |
Eric W. Biederman | 0804ef4 | 2006-10-02 02:17:04 -0700 | [diff] [blame] | 2819 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
| 2820 | out: |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2821 | put_task_struct(reaper); |
| 2822 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2823 | return 0; |
| 2824 | } |
| 2825 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2826 | /* |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2827 | * Tasks |
| 2828 | */ |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2829 | static const struct pid_entry tid_base_stuff[] = { |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2830 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
| 2831 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fd_operations), |
| 2832 | REG("environ", S_IRUSR, proc_environ_operations), |
| 2833 | INF("auxv", S_IRUSR, proc_pid_auxv), |
| 2834 | ONE("status", S_IRUGO, proc_pid_status), |
| 2835 | ONE("personality", S_IRUSR, proc_pid_personality), |
| 2836 | INF("limits", S_IRUSR, proc_pid_limits), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2837 | #ifdef CONFIG_SCHED_DEBUG |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2838 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
Ingo Molnar | 43ae34c | 2007-07-09 18:52:00 +0200 | [diff] [blame] | 2839 | #endif |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2840 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2841 | INF("syscall", S_IRUSR, proc_pid_syscall), |
Roland McGrath | ebcb673 | 2008-07-25 19:46:00 -0700 | [diff] [blame] | 2842 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2843 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
| 2844 | ONE("stat", S_IRUGO, proc_tid_stat), |
| 2845 | ONE("statm", S_IRUGO, proc_pid_statm), |
| 2846 | REG("maps", S_IRUGO, proc_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2847 | #ifdef CONFIG_NUMA |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2848 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2849 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2850 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
| 2851 | LNK("cwd", proc_cwd_link), |
| 2852 | LNK("root", proc_root_link), |
| 2853 | LNK("exe", proc_exe_link), |
| 2854 | REG("mounts", S_IRUGO, proc_mounts_operations), |
| 2855 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 2856 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2857 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
| 2858 | REG("smaps", S_IRUGO, proc_smaps_operations), |
| 2859 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2860 | #endif |
| 2861 | #ifdef CONFIG_SECURITY |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2862 | 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] | 2863 | #endif |
| 2864 | #ifdef CONFIG_KALLSYMS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2865 | INF("wchan", S_IRUGO, proc_pid_wchan), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2866 | #endif |
Ken Chen | 2ec220e | 2008-11-10 11:26:08 +0300 | [diff] [blame] | 2867 | #ifdef CONFIG_STACKTRACE |
| 2868 | ONE("stack", S_IRUSR, proc_pid_stack), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2869 | #endif |
| 2870 | #ifdef CONFIG_SCHEDSTATS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2871 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2872 | #endif |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2873 | #ifdef CONFIG_LATENCYTOP |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2874 | REG("latency", S_IRUGO, proc_lstats_operations), |
Arjan van de Ven | 9745512 | 2008-01-25 21:08:34 +0100 | [diff] [blame] | 2875 | #endif |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 2876 | #ifdef CONFIG_PROC_PID_CPUSET |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2877 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2878 | #endif |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2879 | #ifdef CONFIG_CGROUPS |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2880 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
Paul Menage | a424316 | 2007-10-18 23:39:35 -0700 | [diff] [blame] | 2881 | #endif |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2882 | INF("oom_score", S_IRUGO, proc_oom_score), |
| 2883 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2884 | #ifdef CONFIG_AUDITSYSCALL |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2885 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
| 2886 | REG("sessionid", S_IRUSR, proc_sessionid_operations), |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2887 | #endif |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2888 | #ifdef CONFIG_FAULT_INJECTION |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2889 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
Akinobu Mita | f4f154f | 2006-12-08 02:39:47 -0800 | [diff] [blame] | 2890 | #endif |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2891 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
Alexey Dobriyan | 631f9c1 | 2008-11-10 01:32:52 +0300 | [diff] [blame] | 2892 | INF("io", S_IRUGO, proc_tid_io_accounting), |
Andrea Righi | 297c5d9 | 2008-07-25 01:48:49 -0700 | [diff] [blame] | 2893 | #endif |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2894 | }; |
| 2895 | |
| 2896 | static int proc_tid_base_readdir(struct file * filp, |
| 2897 | void * dirent, filldir_t filldir) |
| 2898 | { |
| 2899 | return proc_pident_readdir(filp,dirent,filldir, |
| 2900 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); |
| 2901 | } |
| 2902 | |
| 2903 | 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] | 2904 | return proc_pident_lookup(dir, dentry, |
| 2905 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2906 | } |
| 2907 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 2908 | static const struct file_operations proc_tid_base_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2909 | .read = generic_read_dir, |
| 2910 | .readdir = proc_tid_base_readdir, |
| 2911 | }; |
| 2912 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 2913 | static const struct inode_operations proc_tid_base_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2914 | .lookup = proc_tid_base_lookup, |
| 2915 | .getattr = pid_getattr, |
| 2916 | .setattr = proc_setattr, |
| 2917 | }; |
| 2918 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2919 | static struct dentry *proc_task_instantiate(struct inode *dir, |
Eric Dumazet | c5141e6 | 2007-05-08 00:26:15 -0700 | [diff] [blame] | 2920 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2921 | { |
| 2922 | struct dentry *error = ERR_PTR(-ENOENT); |
| 2923 | struct inode *inode; |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2924 | inode = proc_pid_make_inode(dir->i_sb, task); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2925 | |
| 2926 | if (!inode) |
| 2927 | goto out; |
| 2928 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
| 2929 | inode->i_op = &proc_tid_base_inode_operations; |
| 2930 | inode->i_fop = &proc_tid_base_operations; |
| 2931 | inode->i_flags|=S_IMMUTABLE; |
Vegard Nossum | aed5417 | 2008-06-05 22:46:53 -0700 | [diff] [blame] | 2932 | |
| 2933 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, |
| 2934 | ARRAY_SIZE(tid_base_stuff)); |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2935 | |
| 2936 | dentry->d_op = &pid_dentry_operations; |
| 2937 | |
| 2938 | d_add(dentry, inode); |
| 2939 | /* Close the race of the process dying before we return the dentry */ |
| 2940 | if (pid_revalidate(dentry, NULL)) |
| 2941 | error = NULL; |
| 2942 | out: |
| 2943 | return error; |
| 2944 | } |
| 2945 | |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2946 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 2947 | { |
| 2948 | struct dentry *result = ERR_PTR(-ENOENT); |
| 2949 | struct task_struct *task; |
| 2950 | struct task_struct *leader = get_proc_task(dir); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2951 | unsigned tid; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2952 | struct pid_namespace *ns; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2953 | |
| 2954 | if (!leader) |
| 2955 | goto out_no_task; |
| 2956 | |
| 2957 | tid = name_to_int(dentry); |
| 2958 | if (tid == ~0U) |
| 2959 | goto out; |
| 2960 | |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2961 | ns = dentry->d_sb->s_fs_info; |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2962 | rcu_read_lock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2963 | task = find_task_by_pid_ns(tid, ns); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2964 | if (task) |
| 2965 | get_task_struct(task); |
| 2966 | rcu_read_unlock(); |
| 2967 | if (!task) |
| 2968 | goto out; |
Pavel Emelyanov | bac0abd | 2007-10-18 23:40:18 -0700 | [diff] [blame] | 2969 | if (!same_thread_group(leader, task)) |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2970 | goto out_drop_task; |
| 2971 | |
Eric W. Biederman | 444ceed | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 2972 | result = proc_task_instantiate(dir, dentry, task, NULL); |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 2973 | out_drop_task: |
| 2974 | put_task_struct(task); |
| 2975 | out: |
| 2976 | put_task_struct(leader); |
| 2977 | out_no_task: |
| 2978 | return result; |
| 2979 | } |
| 2980 | |
| 2981 | /* |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2982 | * Find the first tid of a thread group to return to user space. |
| 2983 | * |
| 2984 | * Usually this is just the thread group leader, but if the users |
| 2985 | * buffer was too small or there was a seek into the middle of the |
| 2986 | * directory we have more work todo. |
| 2987 | * |
| 2988 | * In the case of a short read we start with find_task_by_pid. |
| 2989 | * |
| 2990 | * In the case of a seek we start with the leader and walk nr |
| 2991 | * threads past it. |
| 2992 | */ |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 2993 | static struct task_struct *first_tid(struct task_struct *leader, |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 2994 | int tid, int nr, struct pid_namespace *ns) |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2995 | { |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 2996 | struct task_struct *pos; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2997 | |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 2998 | rcu_read_lock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 2999 | /* Attempt to start with the pid of a thread */ |
| 3000 | if (tid && (nr > 0)) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3001 | pos = find_task_by_pid_ns(tid, ns); |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3002 | if (pos && (pos->group_leader == leader)) |
| 3003 | goto found; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3004 | } |
| 3005 | |
| 3006 | /* If nr exceeds the number of threads there is nothing todo */ |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3007 | pos = NULL; |
Oleg Nesterov | a872ff0 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3008 | if (nr && nr >= get_nr_threads(leader)) |
| 3009 | goto out; |
| 3010 | |
| 3011 | /* If we haven't found our starting place yet start |
| 3012 | * with the leader and walk nr threads forward. |
| 3013 | */ |
| 3014 | for (pos = leader; nr > 0; --nr) { |
| 3015 | pos = next_thread(pos); |
| 3016 | if (pos == leader) { |
| 3017 | pos = NULL; |
| 3018 | goto out; |
| 3019 | } |
| 3020 | } |
| 3021 | found: |
| 3022 | get_task_struct(pos); |
| 3023 | out: |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3024 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3025 | return pos; |
| 3026 | } |
| 3027 | |
| 3028 | /* |
| 3029 | * Find the next thread in the thread list. |
| 3030 | * Return NULL if there is an error or no next thread. |
| 3031 | * |
| 3032 | * The reference to the input task_struct is released. |
| 3033 | */ |
| 3034 | static struct task_struct *next_tid(struct task_struct *start) |
| 3035 | { |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3036 | struct task_struct *pos = NULL; |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3037 | rcu_read_lock(); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3038 | if (pid_alive(start)) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3039 | pos = next_thread(start); |
Oleg Nesterov | c1df7fb | 2006-06-26 00:26:02 -0700 | [diff] [blame] | 3040 | if (thread_group_leader(pos)) |
| 3041 | pos = NULL; |
| 3042 | else |
| 3043 | get_task_struct(pos); |
| 3044 | } |
Eric W. Biederman | cc28873 | 2006-06-26 00:26:01 -0700 | [diff] [blame] | 3045 | rcu_read_unlock(); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3046 | put_task_struct(start); |
| 3047 | return pos; |
| 3048 | } |
| 3049 | |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3050 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
| 3051 | struct task_struct *task, int tid) |
| 3052 | { |
| 3053 | char name[PROC_NUMBUF]; |
| 3054 | int len = snprintf(name, sizeof(name), "%d", tid); |
| 3055 | return proc_fill_cache(filp, dirent, filldir, name, len, |
| 3056 | proc_task_instantiate, task, NULL); |
| 3057 | } |
| 3058 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3059 | /* for the /proc/TGID/task/ directories */ |
| 3060 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) |
| 3061 | { |
Josef "Jeff" Sipek | 2fddfee | 2006-12-08 02:36:36 -0800 | [diff] [blame] | 3062 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3063 | struct inode *inode = dentry->d_inode; |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3064 | struct task_struct *leader = NULL; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3065 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3066 | int retval = -ENOENT; |
| 3067 | ino_t ino; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3068 | int tid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3069 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3070 | struct pid_namespace *ns; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3071 | |
Guillaume Chazarain | 7d89524 | 2007-01-31 23:48:14 -0800 | [diff] [blame] | 3072 | task = get_proc_task(inode); |
| 3073 | if (!task) |
| 3074 | goto out_no_task; |
| 3075 | rcu_read_lock(); |
| 3076 | if (pid_alive(task)) { |
| 3077 | leader = task->group_leader; |
| 3078 | get_task_struct(leader); |
| 3079 | } |
| 3080 | rcu_read_unlock(); |
| 3081 | put_task_struct(task); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3082 | if (!leader) |
| 3083 | goto out_no_task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3084 | retval = 0; |
| 3085 | |
| 3086 | switch (pos) { |
| 3087 | case 0: |
| 3088 | ino = inode->i_ino; |
| 3089 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) |
| 3090 | goto out; |
| 3091 | pos++; |
| 3092 | /* fall through */ |
| 3093 | case 1: |
| 3094 | ino = parent_ino(dentry); |
| 3095 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) |
| 3096 | goto out; |
| 3097 | pos++; |
| 3098 | /* fall through */ |
| 3099 | } |
| 3100 | |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3101 | /* f_version caches the tgid value that the last readdir call couldn't |
| 3102 | * return. lseek aka telldir automagically resets f_version to 0. |
| 3103 | */ |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3104 | ns = filp->f_dentry->d_sb->s_fs_info; |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3105 | tid = (int)filp->f_version; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3106 | filp->f_version = 0; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3107 | for (task = first_tid(leader, tid, pos - 2, ns); |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3108 | task; |
| 3109 | task = next_tid(task), pos++) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 3110 | tid = task_pid_nr_ns(task, ns); |
Eric W. Biederman | 61a2878 | 2006-10-02 02:18:49 -0700 | [diff] [blame] | 3111 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3112 | /* returning this tgid failed, save it as the first |
| 3113 | * pid for the next readir call */ |
Mathieu Desnoyers | 2b47c36 | 2007-10-16 23:27:21 -0700 | [diff] [blame] | 3114 | filp->f_version = (u64)tid; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3115 | put_task_struct(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3116 | break; |
Eric W. Biederman | 0bc58a9 | 2006-06-26 00:25:50 -0700 | [diff] [blame] | 3117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3118 | } |
| 3119 | out: |
| 3120 | filp->f_pos = pos; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3121 | put_task_struct(leader); |
| 3122 | out_no_task: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3123 | return retval; |
| 3124 | } |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3125 | |
| 3126 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 3127 | { |
| 3128 | struct inode *inode = dentry->d_inode; |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3129 | struct task_struct *p = get_proc_task(inode); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3130 | generic_fillattr(inode, stat); |
| 3131 | |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3132 | if (p) { |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3133 | stat->nlink += get_nr_threads(p); |
Eric W. Biederman | 99f8955 | 2006-06-26 00:25:55 -0700 | [diff] [blame] | 3134 | put_task_struct(p); |
Eric W. Biederman | 6e66b52 | 2006-06-26 00:25:47 -0700 | [diff] [blame] | 3135 | } |
| 3136 | |
| 3137 | return 0; |
| 3138 | } |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3139 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 3140 | static const struct inode_operations proc_task_inode_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3141 | .lookup = proc_task_lookup, |
| 3142 | .getattr = proc_task_getattr, |
| 3143 | .setattr = proc_setattr, |
| 3144 | }; |
| 3145 | |
Arjan van de Ven | 00977a5 | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 3146 | static const struct file_operations proc_task_operations = { |
Eric W. Biederman | 28a6d67 | 2006-10-02 02:17:05 -0700 | [diff] [blame] | 3147 | .read = generic_read_dir, |
| 3148 | .readdir = proc_task_readdir, |
| 3149 | }; |