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