Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
10c28d93 AK |
2 | #include <linux/slab.h> |
3 | #include <linux/file.h> | |
4 | #include <linux/fdtable.h> | |
70d78fe7 | 5 | #include <linux/freezer.h> |
10c28d93 AK |
6 | #include <linux/mm.h> |
7 | #include <linux/stat.h> | |
8 | #include <linux/fcntl.h> | |
9 | #include <linux/swap.h> | |
315c6926 | 10 | #include <linux/ctype.h> |
10c28d93 AK |
11 | #include <linux/string.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/perf_event.h> | |
15 | #include <linux/highmem.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/key.h> | |
18 | #include <linux/personality.h> | |
19 | #include <linux/binfmts.h> | |
179899fd | 20 | #include <linux/coredump.h> |
f7ccbae4 | 21 | #include <linux/sched/coredump.h> |
3f07c014 | 22 | #include <linux/sched/signal.h> |
68db0cf1 | 23 | #include <linux/sched/task_stack.h> |
10c28d93 AK |
24 | #include <linux/utsname.h> |
25 | #include <linux/pid_namespace.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/namei.h> | |
28 | #include <linux/mount.h> | |
29 | #include <linux/security.h> | |
30 | #include <linux/syscalls.h> | |
31 | #include <linux/tsacct_kern.h> | |
32 | #include <linux/cn_proc.h> | |
33 | #include <linux/audit.h> | |
34 | #include <linux/tracehook.h> | |
35 | #include <linux/kmod.h> | |
36 | #include <linux/fsnotify.h> | |
37 | #include <linux/fs_struct.h> | |
38 | #include <linux/pipe_fs_i.h> | |
39 | #include <linux/oom.h> | |
40 | #include <linux/compat.h> | |
378c6520 JH |
41 | #include <linux/fs.h> |
42 | #include <linux/path.h> | |
03927c8a | 43 | #include <linux/timekeeping.h> |
10c28d93 | 44 | |
7c0f6ba6 | 45 | #include <linux/uaccess.h> |
10c28d93 AK |
46 | #include <asm/mmu_context.h> |
47 | #include <asm/tlb.h> | |
48 | #include <asm/exec.h> | |
49 | ||
50 | #include <trace/events/task.h> | |
51 | #include "internal.h" | |
52 | ||
53 | #include <trace/events/sched.h> | |
54 | ||
55 | int core_uses_pid; | |
10c28d93 | 56 | unsigned int core_pipe_limit; |
3ceadcf6 ON |
57 | char core_pattern[CORENAME_MAX_SIZE] = "core"; |
58 | static int core_name_size = CORENAME_MAX_SIZE; | |
10c28d93 AK |
59 | |
60 | struct core_name { | |
61 | char *corename; | |
62 | int used, size; | |
63 | }; | |
10c28d93 AK |
64 | |
65 | /* The maximal length of core_pattern is also specified in sysctl.c */ | |
66 | ||
3ceadcf6 | 67 | static int expand_corename(struct core_name *cn, int size) |
10c28d93 | 68 | { |
e7fd1549 | 69 | char *corename = krealloc(cn->corename, size, GFP_KERNEL); |
10c28d93 | 70 | |
e7fd1549 | 71 | if (!corename) |
10c28d93 | 72 | return -ENOMEM; |
10c28d93 | 73 | |
3ceadcf6 ON |
74 | if (size > core_name_size) /* racy but harmless */ |
75 | core_name_size = size; | |
76 | ||
77 | cn->size = ksize(corename); | |
e7fd1549 | 78 | cn->corename = corename; |
10c28d93 AK |
79 | return 0; |
80 | } | |
81 | ||
b4176b7c NI |
82 | static __printf(2, 0) int cn_vprintf(struct core_name *cn, const char *fmt, |
83 | va_list arg) | |
10c28d93 | 84 | { |
5fe9d8ca | 85 | int free, need; |
404ca80e | 86 | va_list arg_copy; |
10c28d93 | 87 | |
5fe9d8ca ON |
88 | again: |
89 | free = cn->size - cn->used; | |
404ca80e ED |
90 | |
91 | va_copy(arg_copy, arg); | |
92 | need = vsnprintf(cn->corename + cn->used, free, fmt, arg_copy); | |
93 | va_end(arg_copy); | |
94 | ||
5fe9d8ca ON |
95 | if (need < free) { |
96 | cn->used += need; | |
97 | return 0; | |
98 | } | |
10c28d93 | 99 | |
3ceadcf6 | 100 | if (!expand_corename(cn, cn->size + need - free + 1)) |
5fe9d8ca | 101 | goto again; |
10c28d93 | 102 | |
5fe9d8ca | 103 | return -ENOMEM; |
10c28d93 AK |
104 | } |
105 | ||
b4176b7c | 106 | static __printf(2, 3) int cn_printf(struct core_name *cn, const char *fmt, ...) |
bc03c691 ON |
107 | { |
108 | va_list arg; | |
109 | int ret; | |
110 | ||
111 | va_start(arg, fmt); | |
112 | ret = cn_vprintf(cn, fmt, arg); | |
113 | va_end(arg); | |
114 | ||
115 | return ret; | |
116 | } | |
117 | ||
b4176b7c NI |
118 | static __printf(2, 3) |
119 | int cn_esc_printf(struct core_name *cn, const char *fmt, ...) | |
10c28d93 | 120 | { |
923bed03 ON |
121 | int cur = cn->used; |
122 | va_list arg; | |
123 | int ret; | |
124 | ||
125 | va_start(arg, fmt); | |
126 | ret = cn_vprintf(cn, fmt, arg); | |
127 | va_end(arg); | |
128 | ||
ac94b6e3 JH |
129 | if (ret == 0) { |
130 | /* | |
131 | * Ensure that this coredump name component can't cause the | |
132 | * resulting corefile path to consist of a ".." or ".". | |
133 | */ | |
134 | if ((cn->used - cur == 1 && cn->corename[cur] == '.') || | |
135 | (cn->used - cur == 2 && cn->corename[cur] == '.' | |
136 | && cn->corename[cur+1] == '.')) | |
137 | cn->corename[cur] = '!'; | |
138 | ||
139 | /* | |
140 | * Empty names are fishy and could be used to create a "//" in a | |
141 | * corefile name, causing the coredump to happen one directory | |
142 | * level too high. Enforce that all components of the core | |
143 | * pattern are at least one character long. | |
144 | */ | |
145 | if (cn->used == cur) | |
146 | ret = cn_printf(cn, "!"); | |
147 | } | |
148 | ||
923bed03 ON |
149 | for (; cur < cn->used; ++cur) { |
150 | if (cn->corename[cur] == '/') | |
151 | cn->corename[cur] = '!'; | |
152 | } | |
153 | return ret; | |
10c28d93 AK |
154 | } |
155 | ||
f38c85f1 | 156 | static int cn_print_exe_file(struct core_name *cn, bool name_only) |
10c28d93 AK |
157 | { |
158 | struct file *exe_file; | |
f38c85f1 | 159 | char *pathbuf, *path, *ptr; |
10c28d93 AK |
160 | int ret; |
161 | ||
162 | exe_file = get_mm_exe_file(current->mm); | |
923bed03 ON |
163 | if (!exe_file) |
164 | return cn_esc_printf(cn, "%s (path unknown)", current->comm); | |
10c28d93 | 165 | |
0ee931c4 | 166 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); |
10c28d93 AK |
167 | if (!pathbuf) { |
168 | ret = -ENOMEM; | |
169 | goto put_exe_file; | |
170 | } | |
171 | ||
9bf39ab2 | 172 | path = file_path(exe_file, pathbuf, PATH_MAX); |
10c28d93 AK |
173 | if (IS_ERR(path)) { |
174 | ret = PTR_ERR(path); | |
175 | goto free_buf; | |
176 | } | |
177 | ||
f38c85f1 LW |
178 | if (name_only) { |
179 | ptr = strrchr(path, '/'); | |
180 | if (ptr) | |
181 | path = ptr + 1; | |
182 | } | |
923bed03 | 183 | ret = cn_esc_printf(cn, "%s", path); |
10c28d93 AK |
184 | |
185 | free_buf: | |
186 | kfree(pathbuf); | |
187 | put_exe_file: | |
188 | fput(exe_file); | |
189 | return ret; | |
190 | } | |
191 | ||
192 | /* format_corename will inspect the pattern parameter, and output a | |
193 | * name into corename, which must have space for at least | |
194 | * CORENAME_MAX_SIZE bytes plus one byte for the zero terminator. | |
195 | */ | |
315c6926 PW |
196 | static int format_corename(struct core_name *cn, struct coredump_params *cprm, |
197 | size_t **argv, int *argc) | |
10c28d93 AK |
198 | { |
199 | const struct cred *cred = current_cred(); | |
200 | const char *pat_ptr = core_pattern; | |
201 | int ispipe = (*pat_ptr == '|'); | |
315c6926 | 202 | bool was_space = false; |
10c28d93 AK |
203 | int pid_in_pattern = 0; |
204 | int err = 0; | |
205 | ||
e7fd1549 | 206 | cn->used = 0; |
3ceadcf6 ON |
207 | cn->corename = NULL; |
208 | if (expand_corename(cn, core_name_size)) | |
10c28d93 | 209 | return -ENOMEM; |
888ffc59 ON |
210 | cn->corename[0] = '\0'; |
211 | ||
315c6926 PW |
212 | if (ispipe) { |
213 | int argvs = sizeof(core_pattern) / 2; | |
214 | (*argv) = kmalloc_array(argvs, sizeof(**argv), GFP_KERNEL); | |
215 | if (!(*argv)) | |
216 | return -ENOMEM; | |
217 | (*argv)[(*argc)++] = 0; | |
888ffc59 | 218 | ++pat_ptr; |
db973a72 SM |
219 | if (!(*pat_ptr)) |
220 | return -ENOMEM; | |
315c6926 | 221 | } |
10c28d93 AK |
222 | |
223 | /* Repeat as long as we have more pattern to process and more output | |
224 | space */ | |
225 | while (*pat_ptr) { | |
315c6926 PW |
226 | /* |
227 | * Split on spaces before doing template expansion so that | |
228 | * %e and %E don't get split if they have spaces in them | |
229 | */ | |
230 | if (ispipe) { | |
231 | if (isspace(*pat_ptr)) { | |
232 | was_space = true; | |
233 | pat_ptr++; | |
234 | continue; | |
235 | } else if (was_space) { | |
236 | was_space = false; | |
237 | err = cn_printf(cn, "%c", '\0'); | |
238 | if (err) | |
239 | return err; | |
240 | (*argv)[(*argc)++] = cn->used; | |
241 | } | |
242 | } | |
10c28d93 | 243 | if (*pat_ptr != '%') { |
10c28d93 AK |
244 | err = cn_printf(cn, "%c", *pat_ptr++); |
245 | } else { | |
246 | switch (*++pat_ptr) { | |
247 | /* single % at the end, drop that */ | |
248 | case 0: | |
249 | goto out; | |
250 | /* Double percent, output one percent */ | |
251 | case '%': | |
252 | err = cn_printf(cn, "%c", '%'); | |
253 | break; | |
254 | /* pid */ | |
255 | case 'p': | |
256 | pid_in_pattern = 1; | |
257 | err = cn_printf(cn, "%d", | |
258 | task_tgid_vnr(current)); | |
259 | break; | |
65aafb1e SG |
260 | /* global pid */ |
261 | case 'P': | |
262 | err = cn_printf(cn, "%d", | |
263 | task_tgid_nr(current)); | |
264 | break; | |
b03023ec ON |
265 | case 'i': |
266 | err = cn_printf(cn, "%d", | |
267 | task_pid_vnr(current)); | |
268 | break; | |
269 | case 'I': | |
270 | err = cn_printf(cn, "%d", | |
271 | task_pid_nr(current)); | |
272 | break; | |
10c28d93 AK |
273 | /* uid */ |
274 | case 'u': | |
5202efe5 NI |
275 | err = cn_printf(cn, "%u", |
276 | from_kuid(&init_user_ns, | |
277 | cred->uid)); | |
10c28d93 AK |
278 | break; |
279 | /* gid */ | |
280 | case 'g': | |
5202efe5 NI |
281 | err = cn_printf(cn, "%u", |
282 | from_kgid(&init_user_ns, | |
283 | cred->gid)); | |
10c28d93 | 284 | break; |
12a2b4b2 ON |
285 | case 'd': |
286 | err = cn_printf(cn, "%d", | |
287 | __get_dumpable(cprm->mm_flags)); | |
288 | break; | |
10c28d93 AK |
289 | /* signal that caused the coredump */ |
290 | case 's': | |
b4176b7c NI |
291 | err = cn_printf(cn, "%d", |
292 | cprm->siginfo->si_signo); | |
10c28d93 AK |
293 | break; |
294 | /* UNIX time of coredump */ | |
295 | case 't': { | |
03927c8a AB |
296 | time64_t time; |
297 | ||
298 | time = ktime_get_real_seconds(); | |
299 | err = cn_printf(cn, "%lld", time); | |
10c28d93 AK |
300 | break; |
301 | } | |
302 | /* hostname */ | |
923bed03 | 303 | case 'h': |
10c28d93 | 304 | down_read(&uts_sem); |
923bed03 | 305 | err = cn_esc_printf(cn, "%s", |
10c28d93 AK |
306 | utsname()->nodename); |
307 | up_read(&uts_sem); | |
10c28d93 | 308 | break; |
f38c85f1 | 309 | /* executable, could be changed by prctl PR_SET_NAME etc */ |
923bed03 ON |
310 | case 'e': |
311 | err = cn_esc_printf(cn, "%s", current->comm); | |
10c28d93 | 312 | break; |
f38c85f1 LW |
313 | /* file name of executable */ |
314 | case 'f': | |
315 | err = cn_print_exe_file(cn, true); | |
316 | break; | |
10c28d93 | 317 | case 'E': |
f38c85f1 | 318 | err = cn_print_exe_file(cn, false); |
10c28d93 AK |
319 | break; |
320 | /* core limit size */ | |
321 | case 'c': | |
322 | err = cn_printf(cn, "%lu", | |
323 | rlimit(RLIMIT_CORE)); | |
324 | break; | |
325 | default: | |
326 | break; | |
327 | } | |
328 | ++pat_ptr; | |
329 | } | |
330 | ||
331 | if (err) | |
332 | return err; | |
333 | } | |
334 | ||
888ffc59 | 335 | out: |
10c28d93 AK |
336 | /* Backward compatibility with core_uses_pid: |
337 | * | |
338 | * If core_pattern does not include a %p (as is the default) | |
339 | * and core_uses_pid is set, then .%pid will be appended to | |
340 | * the filename. Do not do this for piped commands. */ | |
341 | if (!ispipe && !pid_in_pattern && core_uses_pid) { | |
342 | err = cn_printf(cn, ".%d", task_tgid_vnr(current)); | |
343 | if (err) | |
344 | return err; | |
345 | } | |
10c28d93 AK |
346 | return ispipe; |
347 | } | |
348 | ||
5fa534c9 | 349 | static int zap_process(struct task_struct *start, int exit_code, int flags) |
10c28d93 AK |
350 | { |
351 | struct task_struct *t; | |
352 | int nr = 0; | |
353 | ||
5fa534c9 ON |
354 | /* ignore all signals except SIGKILL, see prepare_signal() */ |
355 | start->signal->flags = SIGNAL_GROUP_COREDUMP | flags; | |
10c28d93 AK |
356 | start->signal->group_exit_code = exit_code; |
357 | start->signal->group_stop_count = 0; | |
358 | ||
d61ba589 | 359 | for_each_thread(start, t) { |
10c28d93 AK |
360 | task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK); |
361 | if (t != current && t->mm) { | |
362 | sigaddset(&t->pending.signal, SIGKILL); | |
363 | signal_wake_up(t, 1); | |
364 | nr++; | |
365 | } | |
d61ba589 | 366 | } |
10c28d93 AK |
367 | |
368 | return nr; | |
369 | } | |
370 | ||
403bad72 ON |
371 | static int zap_threads(struct task_struct *tsk, struct mm_struct *mm, |
372 | struct core_state *core_state, int exit_code) | |
10c28d93 AK |
373 | { |
374 | struct task_struct *g, *p; | |
375 | unsigned long flags; | |
376 | int nr = -EAGAIN; | |
377 | ||
378 | spin_lock_irq(&tsk->sighand->siglock); | |
379 | if (!signal_group_exit(tsk->signal)) { | |
380 | mm->core_state = core_state; | |
6cd8f0ac | 381 | tsk->signal->group_exit_task = tsk; |
5fa534c9 | 382 | nr = zap_process(tsk, exit_code, 0); |
403bad72 | 383 | clear_tsk_thread_flag(tsk, TIF_SIGPENDING); |
10c28d93 AK |
384 | } |
385 | spin_unlock_irq(&tsk->sighand->siglock); | |
386 | if (unlikely(nr < 0)) | |
387 | return nr; | |
388 | ||
aed8adb7 | 389 | tsk->flags |= PF_DUMPCORE; |
10c28d93 AK |
390 | if (atomic_read(&mm->mm_users) == nr + 1) |
391 | goto done; | |
392 | /* | |
393 | * We should find and kill all tasks which use this mm, and we should | |
394 | * count them correctly into ->nr_threads. We don't take tasklist | |
395 | * lock, but this is safe wrt: | |
396 | * | |
397 | * fork: | |
398 | * None of sub-threads can fork after zap_process(leader). All | |
399 | * processes which were created before this point should be | |
400 | * visible to zap_threads() because copy_process() adds the new | |
401 | * process to the tail of init_task.tasks list, and lock/unlock | |
402 | * of ->siglock provides a memory barrier. | |
403 | * | |
404 | * do_exit: | |
c1e8d7c6 | 405 | * The caller holds mm->mmap_lock. This means that the task which |
10c28d93 AK |
406 | * uses this mm can't pass exit_mm(), so it can't exit or clear |
407 | * its ->mm. | |
408 | * | |
409 | * de_thread: | |
410 | * It does list_replace_rcu(&leader->tasks, ¤t->tasks), | |
411 | * we must see either old or new leader, this does not matter. | |
412 | * However, it can change p->sighand, so lock_task_sighand(p) | |
c1e8d7c6 | 413 | * must be used. Since p->mm != NULL and we hold ->mmap_lock |
10c28d93 AK |
414 | * it can't fail. |
415 | * | |
416 | * Note also that "g" can be the old leader with ->mm == NULL | |
417 | * and already unhashed and thus removed from ->thread_group. | |
418 | * This is OK, __unhash_process()->list_del_rcu() does not | |
419 | * clear the ->next pointer, we will find the new leader via | |
420 | * next_thread(). | |
421 | */ | |
422 | rcu_read_lock(); | |
423 | for_each_process(g) { | |
424 | if (g == tsk->group_leader) | |
425 | continue; | |
426 | if (g->flags & PF_KTHREAD) | |
427 | continue; | |
d61ba589 ON |
428 | |
429 | for_each_thread(g, p) { | |
430 | if (unlikely(!p->mm)) | |
431 | continue; | |
432 | if (unlikely(p->mm == mm)) { | |
433 | lock_task_sighand(p, &flags); | |
434 | nr += zap_process(p, exit_code, | |
435 | SIGNAL_GROUP_EXIT); | |
436 | unlock_task_sighand(p, &flags); | |
10c28d93 | 437 | } |
d61ba589 ON |
438 | break; |
439 | } | |
10c28d93 AK |
440 | } |
441 | rcu_read_unlock(); | |
442 | done: | |
443 | atomic_set(&core_state->nr_threads, nr); | |
444 | return nr; | |
445 | } | |
446 | ||
447 | static int coredump_wait(int exit_code, struct core_state *core_state) | |
448 | { | |
449 | struct task_struct *tsk = current; | |
450 | struct mm_struct *mm = tsk->mm; | |
451 | int core_waiters = -EBUSY; | |
452 | ||
453 | init_completion(&core_state->startup); | |
454 | core_state->dumper.task = tsk; | |
455 | core_state->dumper.next = NULL; | |
456 | ||
d8ed45c5 | 457 | if (mmap_write_lock_killable(mm)) |
4136c26b MH |
458 | return -EINTR; |
459 | ||
10c28d93 AK |
460 | if (!mm->core_state) |
461 | core_waiters = zap_threads(tsk, mm, core_state, exit_code); | |
d8ed45c5 | 462 | mmap_write_unlock(mm); |
10c28d93 AK |
463 | |
464 | if (core_waiters > 0) { | |
465 | struct core_thread *ptr; | |
466 | ||
70d78fe7 | 467 | freezer_do_not_count(); |
10c28d93 | 468 | wait_for_completion(&core_state->startup); |
70d78fe7 | 469 | freezer_count(); |
10c28d93 AK |
470 | /* |
471 | * Wait for all the threads to become inactive, so that | |
472 | * all the thread context (extended register state, like | |
473 | * fpu etc) gets copied to the memory. | |
474 | */ | |
475 | ptr = core_state->dumper.next; | |
476 | while (ptr != NULL) { | |
477 | wait_task_inactive(ptr->task, 0); | |
478 | ptr = ptr->next; | |
479 | } | |
480 | } | |
481 | ||
482 | return core_waiters; | |
483 | } | |
484 | ||
acdedd99 | 485 | static void coredump_finish(struct mm_struct *mm, bool core_dumped) |
10c28d93 AK |
486 | { |
487 | struct core_thread *curr, *next; | |
488 | struct task_struct *task; | |
489 | ||
6cd8f0ac | 490 | spin_lock_irq(¤t->sighand->siglock); |
acdedd99 ON |
491 | if (core_dumped && !__fatal_signal_pending(current)) |
492 | current->signal->group_exit_code |= 0x80; | |
6cd8f0ac ON |
493 | current->signal->group_exit_task = NULL; |
494 | current->signal->flags = SIGNAL_GROUP_EXIT; | |
495 | spin_unlock_irq(¤t->sighand->siglock); | |
496 | ||
10c28d93 AK |
497 | next = mm->core_state->dumper.next; |
498 | while ((curr = next) != NULL) { | |
499 | next = curr->next; | |
500 | task = curr->task; | |
501 | /* | |
502 | * see exit_mm(), curr->task must not see | |
503 | * ->task == NULL before we read ->next. | |
504 | */ | |
505 | smp_mb(); | |
506 | curr->task = NULL; | |
507 | wake_up_process(task); | |
508 | } | |
509 | ||
510 | mm->core_state = NULL; | |
511 | } | |
512 | ||
528f827e ON |
513 | static bool dump_interrupted(void) |
514 | { | |
515 | /* | |
516 | * SIGKILL or freezing() interrupt the coredumping. Perhaps we | |
517 | * can do try_to_freeze() and check __fatal_signal_pending(), | |
518 | * but then we need to teach dump_write() to restart and clear | |
519 | * TIF_SIGPENDING. | |
520 | */ | |
521 | return signal_pending(current); | |
522 | } | |
523 | ||
10c28d93 AK |
524 | static void wait_for_dump_helpers(struct file *file) |
525 | { | |
de32ec4c | 526 | struct pipe_inode_info *pipe = file->private_data; |
10c28d93 AK |
527 | |
528 | pipe_lock(pipe); | |
529 | pipe->readers++; | |
530 | pipe->writers--; | |
0ddad21d | 531 | wake_up_interruptible_sync(&pipe->rd_wait); |
dc7ee2aa ON |
532 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
533 | pipe_unlock(pipe); | |
10c28d93 | 534 | |
dc7ee2aa ON |
535 | /* |
536 | * We actually want wait_event_freezable() but then we need | |
537 | * to clear TIF_SIGPENDING and improve dump_interrupted(). | |
538 | */ | |
0ddad21d | 539 | wait_event_interruptible(pipe->rd_wait, pipe->readers == 1); |
10c28d93 | 540 | |
dc7ee2aa | 541 | pipe_lock(pipe); |
10c28d93 AK |
542 | pipe->readers--; |
543 | pipe->writers++; | |
544 | pipe_unlock(pipe); | |
10c28d93 AK |
545 | } |
546 | ||
547 | /* | |
548 | * umh_pipe_setup | |
549 | * helper function to customize the process used | |
550 | * to collect the core in userspace. Specifically | |
551 | * it sets up a pipe and installs it as fd 0 (stdin) | |
552 | * for the process. Returns 0 on success, or | |
553 | * PTR_ERR on failure. | |
554 | * Note that it also sets the core limit to 1. This | |
555 | * is a special value that we use to trap recursive | |
556 | * core dumps | |
557 | */ | |
558 | static int umh_pipe_setup(struct subprocess_info *info, struct cred *new) | |
559 | { | |
560 | struct file *files[2]; | |
561 | struct coredump_params *cp = (struct coredump_params *)info->data; | |
562 | int err = create_pipe_files(files, 0); | |
563 | if (err) | |
564 | return err; | |
565 | ||
566 | cp->file = files[1]; | |
567 | ||
45525b26 AV |
568 | err = replace_fd(0, files[0], 0); |
569 | fput(files[0]); | |
10c28d93 AK |
570 | /* and disallow core files too */ |
571 | current->signal->rlim[RLIMIT_CORE] = (struct rlimit){1, 1}; | |
572 | ||
45525b26 | 573 | return err; |
10c28d93 AK |
574 | } |
575 | ||
ae7795bc | 576 | void do_coredump(const kernel_siginfo_t *siginfo) |
10c28d93 AK |
577 | { |
578 | struct core_state core_state; | |
579 | struct core_name cn; | |
580 | struct mm_struct *mm = current->mm; | |
581 | struct linux_binfmt * binfmt; | |
582 | const struct cred *old_cred; | |
583 | struct cred *cred; | |
584 | int retval = 0; | |
10c28d93 | 585 | int ispipe; |
315c6926 PW |
586 | size_t *argv = NULL; |
587 | int argc = 0; | |
fbb18169 JH |
588 | /* require nonrelative corefile path and be extra careful */ |
589 | bool need_suid_safe = false; | |
acdedd99 | 590 | bool core_dumped = false; |
10c28d93 AK |
591 | static atomic_t core_dump_count = ATOMIC_INIT(0); |
592 | struct coredump_params cprm = { | |
5ab1c309 | 593 | .siginfo = siginfo, |
541880d9 | 594 | .regs = signal_pt_regs(), |
10c28d93 AK |
595 | .limit = rlimit(RLIMIT_CORE), |
596 | /* | |
597 | * We must use the same mm->flags while dumping core to avoid | |
598 | * inconsistency of bit flags, since this flag is not protected | |
599 | * by any locks. | |
600 | */ | |
601 | .mm_flags = mm->flags, | |
602 | }; | |
603 | ||
5ab1c309 | 604 | audit_core_dumps(siginfo->si_signo); |
10c28d93 AK |
605 | |
606 | binfmt = mm->binfmt; | |
607 | if (!binfmt || !binfmt->core_dump) | |
608 | goto fail; | |
609 | if (!__get_dumpable(cprm.mm_flags)) | |
610 | goto fail; | |
611 | ||
612 | cred = prepare_creds(); | |
613 | if (!cred) | |
614 | goto fail; | |
615 | /* | |
616 | * We cannot trust fsuid as being the "true" uid of the process | |
617 | * nor do we know its entire history. We only know it was tainted | |
618 | * so we dump it as root in mode 2, and only into a controlled | |
619 | * environment (pipe handler or fully qualified path). | |
620 | */ | |
e579d2c2 | 621 | if (__get_dumpable(cprm.mm_flags) == SUID_DUMP_ROOT) { |
10c28d93 | 622 | /* Setuid core dump mode */ |
10c28d93 | 623 | cred->fsuid = GLOBAL_ROOT_UID; /* Dump root private */ |
fbb18169 | 624 | need_suid_safe = true; |
10c28d93 AK |
625 | } |
626 | ||
5ab1c309 | 627 | retval = coredump_wait(siginfo->si_signo, &core_state); |
10c28d93 AK |
628 | if (retval < 0) |
629 | goto fail_creds; | |
630 | ||
631 | old_cred = override_creds(cred); | |
632 | ||
315c6926 | 633 | ispipe = format_corename(&cn, &cprm, &argv, &argc); |
10c28d93 | 634 | |
fb96c475 | 635 | if (ispipe) { |
315c6926 | 636 | int argi; |
10c28d93 AK |
637 | int dump_count; |
638 | char **helper_argv; | |
907ed132 | 639 | struct subprocess_info *sub_info; |
10c28d93 AK |
640 | |
641 | if (ispipe < 0) { | |
642 | printk(KERN_WARNING "format_corename failed\n"); | |
643 | printk(KERN_WARNING "Aborting core\n"); | |
e7fd1549 | 644 | goto fail_unlock; |
10c28d93 AK |
645 | } |
646 | ||
647 | if (cprm.limit == 1) { | |
648 | /* See umh_pipe_setup() which sets RLIMIT_CORE = 1. | |
649 | * | |
650 | * Normally core limits are irrelevant to pipes, since | |
651 | * we're not writing to the file system, but we use | |
fcbc32bc | 652 | * cprm.limit of 1 here as a special value, this is a |
10c28d93 AK |
653 | * consistent way to catch recursive crashes. |
654 | * We can still crash if the core_pattern binary sets | |
655 | * RLIM_CORE = !1, but it runs as root, and can do | |
656 | * lots of stupid things. | |
657 | * | |
658 | * Note that we use task_tgid_vnr here to grab the pid | |
659 | * of the process group leader. That way we get the | |
660 | * right pid if a thread in a multi-threaded | |
661 | * core_pattern process dies. | |
662 | */ | |
663 | printk(KERN_WARNING | |
664 | "Process %d(%s) has RLIMIT_CORE set to 1\n", | |
665 | task_tgid_vnr(current), current->comm); | |
666 | printk(KERN_WARNING "Aborting core\n"); | |
667 | goto fail_unlock; | |
668 | } | |
669 | cprm.limit = RLIM_INFINITY; | |
670 | ||
671 | dump_count = atomic_inc_return(&core_dump_count); | |
672 | if (core_pipe_limit && (core_pipe_limit < dump_count)) { | |
673 | printk(KERN_WARNING "Pid %d(%s) over core_pipe_limit\n", | |
674 | task_tgid_vnr(current), current->comm); | |
675 | printk(KERN_WARNING "Skipping core dump\n"); | |
676 | goto fail_dropcount; | |
677 | } | |
678 | ||
315c6926 PW |
679 | helper_argv = kmalloc_array(argc + 1, sizeof(*helper_argv), |
680 | GFP_KERNEL); | |
10c28d93 AK |
681 | if (!helper_argv) { |
682 | printk(KERN_WARNING "%s failed to allocate memory\n", | |
683 | __func__); | |
684 | goto fail_dropcount; | |
685 | } | |
315c6926 PW |
686 | for (argi = 0; argi < argc; argi++) |
687 | helper_argv[argi] = cn.corename + argv[argi]; | |
688 | helper_argv[argi] = NULL; | |
10c28d93 | 689 | |
907ed132 LDM |
690 | retval = -ENOMEM; |
691 | sub_info = call_usermodehelper_setup(helper_argv[0], | |
692 | helper_argv, NULL, GFP_KERNEL, | |
693 | umh_pipe_setup, NULL, &cprm); | |
694 | if (sub_info) | |
695 | retval = call_usermodehelper_exec(sub_info, | |
696 | UMH_WAIT_EXEC); | |
697 | ||
315c6926 | 698 | kfree(helper_argv); |
10c28d93 | 699 | if (retval) { |
888ffc59 | 700 | printk(KERN_INFO "Core dump to |%s pipe failed\n", |
10c28d93 AK |
701 | cn.corename); |
702 | goto close_fail; | |
fb96c475 | 703 | } |
10c28d93 AK |
704 | } else { |
705 | struct inode *inode; | |
378c6520 JH |
706 | int open_flags = O_CREAT | O_RDWR | O_NOFOLLOW | |
707 | O_LARGEFILE | O_EXCL; | |
10c28d93 AK |
708 | |
709 | if (cprm.limit < binfmt->min_coredump) | |
710 | goto fail_unlock; | |
711 | ||
fbb18169 | 712 | if (need_suid_safe && cn.corename[0] != '/') { |
10c28d93 AK |
713 | printk(KERN_WARNING "Pid %d(%s) can only dump core "\ |
714 | "to fully qualified path!\n", | |
715 | task_tgid_vnr(current), current->comm); | |
716 | printk(KERN_WARNING "Skipping core dump\n"); | |
717 | goto fail_unlock; | |
718 | } | |
719 | ||
fbb18169 JH |
720 | /* |
721 | * Unlink the file if it exists unless this is a SUID | |
722 | * binary - in that case, we're running around with root | |
723 | * privs and don't want to unlink another user's coredump. | |
724 | */ | |
725 | if (!need_suid_safe) { | |
fbb18169 JH |
726 | /* |
727 | * If it doesn't exist, that's fine. If there's some | |
728 | * other problem, we'll catch it at the filp_open(). | |
729 | */ | |
96271654 | 730 | do_unlinkat(AT_FDCWD, getname_kernel(cn.corename)); |
fbb18169 JH |
731 | } |
732 | ||
733 | /* | |
734 | * There is a race between unlinking and creating the | |
735 | * file, but if that causes an EEXIST here, that's | |
736 | * fine - another process raced with us while creating | |
737 | * the corefile, and the other process won. To userspace, | |
738 | * what matters is that at least one of the two processes | |
739 | * writes its coredump successfully, not which one. | |
740 | */ | |
378c6520 JH |
741 | if (need_suid_safe) { |
742 | /* | |
743 | * Using user namespaces, normal user tasks can change | |
744 | * their current->fs->root to point to arbitrary | |
745 | * directories. Since the intention of the "only dump | |
746 | * with a fully qualified path" rule is to control where | |
747 | * coredumps may be placed using root privileges, | |
748 | * current->fs->root must not be used. Instead, use the | |
749 | * root directory of init_task. | |
750 | */ | |
751 | struct path root; | |
752 | ||
753 | task_lock(&init_task); | |
754 | get_fs_root(init_task.fs, &root); | |
755 | task_unlock(&init_task); | |
756 | cprm.file = file_open_root(root.dentry, root.mnt, | |
757 | cn.corename, open_flags, 0600); | |
758 | path_put(&root); | |
759 | } else { | |
760 | cprm.file = filp_open(cn.corename, open_flags, 0600); | |
761 | } | |
10c28d93 AK |
762 | if (IS_ERR(cprm.file)) |
763 | goto fail_unlock; | |
764 | ||
496ad9aa | 765 | inode = file_inode(cprm.file); |
10c28d93 AK |
766 | if (inode->i_nlink > 1) |
767 | goto close_fail; | |
768 | if (d_unhashed(cprm.file->f_path.dentry)) | |
769 | goto close_fail; | |
770 | /* | |
771 | * AK: actually i see no reason to not allow this for named | |
772 | * pipes etc, but keep the previous behaviour for now. | |
773 | */ | |
774 | if (!S_ISREG(inode->i_mode)) | |
775 | goto close_fail; | |
776 | /* | |
40f705a7 JH |
777 | * Don't dump core if the filesystem changed owner or mode |
778 | * of the file during file creation. This is an issue when | |
779 | * a process dumps core while its cwd is e.g. on a vfat | |
780 | * filesystem. | |
10c28d93 AK |
781 | */ |
782 | if (!uid_eq(inode->i_uid, current_fsuid())) | |
783 | goto close_fail; | |
40f705a7 JH |
784 | if ((inode->i_mode & 0677) != 0600) |
785 | goto close_fail; | |
86cc0584 | 786 | if (!(cprm.file->f_mode & FMODE_CAN_WRITE)) |
10c28d93 AK |
787 | goto close_fail; |
788 | if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file)) | |
789 | goto close_fail; | |
790 | } | |
791 | ||
792 | /* get us an unshared descriptor table; almost always a no-op */ | |
1f702603 | 793 | retval = unshare_files(); |
10c28d93 AK |
794 | if (retval) |
795 | goto close_fail; | |
e86d35c3 | 796 | if (!dump_interrupted()) { |
3740d93e LC |
797 | /* |
798 | * umh disabled with CONFIG_STATIC_USERMODEHELPER_PATH="" would | |
799 | * have this set to NULL. | |
800 | */ | |
801 | if (!cprm.file) { | |
802 | pr_info("Core dump to |%s disabled\n", cn.corename); | |
803 | goto close_fail; | |
804 | } | |
e86d35c3 AV |
805 | file_start_write(cprm.file); |
806 | core_dumped = binfmt->core_dump(&cprm); | |
807 | file_end_write(cprm.file); | |
808 | } | |
10c28d93 AK |
809 | if (ispipe && core_pipe_limit) |
810 | wait_for_dump_helpers(cprm.file); | |
811 | close_fail: | |
812 | if (cprm.file) | |
813 | filp_close(cprm.file, NULL); | |
814 | fail_dropcount: | |
815 | if (ispipe) | |
816 | atomic_dec(&core_dump_count); | |
817 | fail_unlock: | |
315c6926 | 818 | kfree(argv); |
10c28d93 | 819 | kfree(cn.corename); |
acdedd99 | 820 | coredump_finish(mm, core_dumped); |
10c28d93 AK |
821 | revert_creds(old_cred); |
822 | fail_creds: | |
823 | put_cred(cred); | |
824 | fail: | |
825 | return; | |
826 | } | |
827 | ||
828 | /* | |
829 | * Core dumping helper functions. These are the only things you should | |
830 | * do on a core-file: use only these functions to write out all the | |
831 | * necessary info. | |
832 | */ | |
ecc8c772 AV |
833 | int dump_emit(struct coredump_params *cprm, const void *addr, int nr) |
834 | { | |
835 | struct file *file = cprm->file; | |
2507a4fb AV |
836 | loff_t pos = file->f_pos; |
837 | ssize_t n; | |
2c4cb043 | 838 | if (cprm->written + nr > cprm->limit) |
ecc8c772 | 839 | return 0; |
df0c09c0 JH |
840 | |
841 | ||
842 | if (dump_interrupted()) | |
843 | return 0; | |
844 | n = __kernel_write(file, addr, nr, &pos); | |
845 | if (n != nr) | |
846 | return 0; | |
847 | file->f_pos = pos; | |
848 | cprm->written += n; | |
849 | cprm->pos += n; | |
850 | ||
ecc8c772 AV |
851 | return 1; |
852 | } | |
853 | EXPORT_SYMBOL(dump_emit); | |
854 | ||
9b56d543 | 855 | int dump_skip(struct coredump_params *cprm, size_t nr) |
10c28d93 | 856 | { |
9b56d543 AV |
857 | static char zeroes[PAGE_SIZE]; |
858 | struct file *file = cprm->file; | |
10c28d93 | 859 | if (file->f_op->llseek && file->f_op->llseek != no_llseek) { |
528f827e | 860 | if (dump_interrupted() || |
9b56d543 | 861 | file->f_op->llseek(file, nr, SEEK_CUR) < 0) |
10c28d93 | 862 | return 0; |
1607f09c | 863 | cprm->pos += nr; |
9b56d543 | 864 | return 1; |
10c28d93 | 865 | } else { |
9b56d543 AV |
866 | while (nr > PAGE_SIZE) { |
867 | if (!dump_emit(cprm, zeroes, PAGE_SIZE)) | |
868 | return 0; | |
869 | nr -= PAGE_SIZE; | |
10c28d93 | 870 | } |
9b56d543 | 871 | return dump_emit(cprm, zeroes, nr); |
10c28d93 | 872 | } |
10c28d93 | 873 | } |
9b56d543 | 874 | EXPORT_SYMBOL(dump_skip); |
22a8cb82 | 875 | |
afc63a97 JH |
876 | #ifdef CONFIG_ELF_CORE |
877 | int dump_user_range(struct coredump_params *cprm, unsigned long start, | |
878 | unsigned long len) | |
879 | { | |
880 | unsigned long addr; | |
881 | ||
882 | for (addr = start; addr < start + len; addr += PAGE_SIZE) { | |
883 | struct page *page; | |
884 | int stop; | |
885 | ||
886 | /* | |
887 | * To avoid having to allocate page tables for virtual address | |
888 | * ranges that have never been used yet, and also to make it | |
889 | * easy to generate sparse core files, use a helper that returns | |
890 | * NULL when encountering an empty page table entry that would | |
891 | * otherwise have been filled with the zero page. | |
892 | */ | |
893 | page = get_dump_page(addr); | |
894 | if (page) { | |
895 | void *kaddr = kmap(page); | |
896 | ||
897 | stop = !dump_emit(cprm, kaddr, PAGE_SIZE); | |
898 | kunmap(page); | |
899 | put_page(page); | |
900 | } else { | |
901 | stop = !dump_skip(cprm, PAGE_SIZE); | |
902 | } | |
903 | if (stop) | |
904 | return 0; | |
905 | } | |
906 | return 1; | |
907 | } | |
908 | #endif | |
909 | ||
22a8cb82 AV |
910 | int dump_align(struct coredump_params *cprm, int align) |
911 | { | |
1607f09c | 912 | unsigned mod = cprm->pos & (align - 1); |
22a8cb82 | 913 | if (align & (align - 1)) |
db51242d AV |
914 | return 0; |
915 | return mod ? dump_skip(cprm, align - mod) : 1; | |
22a8cb82 AV |
916 | } |
917 | EXPORT_SYMBOL(dump_align); | |
4d22c75d DK |
918 | |
919 | /* | |
920 | * Ensures that file size is big enough to contain the current file | |
921 | * postion. This prevents gdb from complaining about a truncated file | |
922 | * if the last "write" to the file was dump_skip. | |
923 | */ | |
924 | void dump_truncate(struct coredump_params *cprm) | |
925 | { | |
926 | struct file *file = cprm->file; | |
927 | loff_t offset; | |
928 | ||
929 | if (file->f_op->llseek && file->f_op->llseek != no_llseek) { | |
930 | offset = file->f_op->llseek(file, 0, SEEK_CUR); | |
931 | if (i_size_read(file->f_mapping->host) < offset) | |
932 | do_truncate(file->f_path.dentry, offset, 0, file); | |
933 | } | |
934 | } | |
935 | EXPORT_SYMBOL(dump_truncate); | |
429a22e7 JH |
936 | |
937 | /* | |
938 | * The purpose of always_dump_vma() is to make sure that special kernel mappings | |
939 | * that are useful for post-mortem analysis are included in every core dump. | |
940 | * In that way we ensure that the core dump is fully interpretable later | |
941 | * without matching up the same kernel and hardware config to see what PC values | |
942 | * meant. These special mappings include - vDSO, vsyscall, and other | |
943 | * architecture specific mappings | |
944 | */ | |
945 | static bool always_dump_vma(struct vm_area_struct *vma) | |
946 | { | |
947 | /* Any vsyscall mappings? */ | |
948 | if (vma == get_gate_vma(vma->vm_mm)) | |
949 | return true; | |
950 | ||
951 | /* | |
952 | * Assume that all vmas with a .name op should always be dumped. | |
953 | * If this changes, a new vm_ops field can easily be added. | |
954 | */ | |
955 | if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma)) | |
956 | return true; | |
957 | ||
958 | /* | |
959 | * arch_vma_name() returns non-NULL for special architecture mappings, | |
960 | * such as vDSO sections. | |
961 | */ | |
962 | if (arch_vma_name(vma)) | |
963 | return true; | |
964 | ||
965 | return false; | |
966 | } | |
967 | ||
968 | /* | |
969 | * Decide how much of @vma's contents should be included in a core dump. | |
970 | */ | |
a07279c9 JH |
971 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
972 | unsigned long mm_flags) | |
429a22e7 JH |
973 | { |
974 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) | |
975 | ||
976 | /* always dump the vdso and vsyscall sections */ | |
977 | if (always_dump_vma(vma)) | |
978 | goto whole; | |
979 | ||
980 | if (vma->vm_flags & VM_DONTDUMP) | |
981 | return 0; | |
982 | ||
983 | /* support for DAX */ | |
984 | if (vma_is_dax(vma)) { | |
985 | if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED)) | |
986 | goto whole; | |
987 | if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE)) | |
988 | goto whole; | |
989 | return 0; | |
990 | } | |
991 | ||
992 | /* Hugetlb memory check */ | |
993 | if (is_vm_hugetlb_page(vma)) { | |
994 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
995 | goto whole; | |
996 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
997 | goto whole; | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | /* Do not dump I/O mapped devices or special mappings */ | |
1002 | if (vma->vm_flags & VM_IO) | |
1003 | return 0; | |
1004 | ||
1005 | /* By default, dump shared memory if mapped from an anonymous file. */ | |
1006 | if (vma->vm_flags & VM_SHARED) { | |
1007 | if (file_inode(vma->vm_file)->i_nlink == 0 ? | |
1008 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) | |
1009 | goto whole; | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | /* Dump segments that have been written to. */ | |
1014 | if ((!IS_ENABLED(CONFIG_MMU) || vma->anon_vma) && FILTER(ANON_PRIVATE)) | |
1015 | goto whole; | |
1016 | if (vma->vm_file == NULL) | |
1017 | return 0; | |
1018 | ||
1019 | if (FILTER(MAPPED_PRIVATE)) | |
1020 | goto whole; | |
1021 | ||
1022 | /* | |
1023 | * If this is the beginning of an executable file mapping, | |
1024 | * dump the first page to aid in determining what was mapped here. | |
1025 | */ | |
1026 | if (FILTER(ELF_HEADERS) && | |
1027 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ) && | |
1028 | (READ_ONCE(file_inode(vma->vm_file)->i_mode) & 0111) != 0) | |
1029 | return PAGE_SIZE; | |
1030 | ||
1031 | #undef FILTER | |
1032 | ||
1033 | return 0; | |
1034 | ||
1035 | whole: | |
1036 | return vma->vm_end - vma->vm_start; | |
1037 | } | |
a07279c9 JH |
1038 | |
1039 | static struct vm_area_struct *first_vma(struct task_struct *tsk, | |
1040 | struct vm_area_struct *gate_vma) | |
1041 | { | |
1042 | struct vm_area_struct *ret = tsk->mm->mmap; | |
1043 | ||
1044 | if (ret) | |
1045 | return ret; | |
1046 | return gate_vma; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * Helper function for iterating across a vma list. It ensures that the caller | |
1051 | * will visit `gate_vma' prior to terminating the search. | |
1052 | */ | |
1053 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
1054 | struct vm_area_struct *gate_vma) | |
1055 | { | |
1056 | struct vm_area_struct *ret; | |
1057 | ||
1058 | ret = this_vma->vm_next; | |
1059 | if (ret) | |
1060 | return ret; | |
1061 | if (this_vma == gate_vma) | |
1062 | return NULL; | |
1063 | return gate_vma; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Under the mmap_lock, take a snapshot of relevant information about the task's | |
1068 | * VMAs. | |
1069 | */ | |
1070 | int dump_vma_snapshot(struct coredump_params *cprm, int *vma_count, | |
1071 | struct core_vma_metadata **vma_meta, | |
1072 | size_t *vma_data_size_ptr) | |
1073 | { | |
1074 | struct vm_area_struct *vma, *gate_vma; | |
1075 | struct mm_struct *mm = current->mm; | |
1076 | int i; | |
1077 | size_t vma_data_size = 0; | |
1078 | ||
1079 | /* | |
1080 | * Once the stack expansion code is fixed to not change VMA bounds | |
1081 | * under mmap_lock in read mode, this can be changed to take the | |
1082 | * mmap_lock in read mode. | |
1083 | */ | |
1084 | if (mmap_write_lock_killable(mm)) | |
1085 | return -EINTR; | |
1086 | ||
1087 | gate_vma = get_gate_vma(mm); | |
1088 | *vma_count = mm->map_count + (gate_vma ? 1 : 0); | |
1089 | ||
1090 | *vma_meta = kvmalloc_array(*vma_count, sizeof(**vma_meta), GFP_KERNEL); | |
1091 | if (!*vma_meta) { | |
1092 | mmap_write_unlock(mm); | |
1093 | return -ENOMEM; | |
1094 | } | |
1095 | ||
1096 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; | |
1097 | vma = next_vma(vma, gate_vma), i++) { | |
1098 | struct core_vma_metadata *m = (*vma_meta) + i; | |
1099 | ||
1100 | m->start = vma->vm_start; | |
1101 | m->end = vma->vm_end; | |
1102 | m->flags = vma->vm_flags; | |
1103 | m->dump_size = vma_dump_size(vma, cprm->mm_flags); | |
1104 | ||
1105 | vma_data_size += m->dump_size; | |
1106 | } | |
1107 | ||
1108 | mmap_write_unlock(mm); | |
1109 | ||
1110 | if (WARN_ON(i != *vma_count)) | |
1111 | return -EFAULT; | |
1112 | ||
1113 | *vma_data_size_ptr = vma_data_size; | |
1114 | return 0; | |
1115 | } |