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> |
f0bc21b2 | 44 | #include <linux/sysctl.h> |
10c28d93 | 45 | |
7c0f6ba6 | 46 | #include <linux/uaccess.h> |
10c28d93 AK |
47 | #include <asm/mmu_context.h> |
48 | #include <asm/tlb.h> | |
49 | #include <asm/exec.h> | |
50 | ||
51 | #include <trace/events/task.h> | |
52 | #include "internal.h" | |
53 | ||
54 | #include <trace/events/sched.h> | |
55 | ||
f0bc21b2 XN |
56 | static int core_uses_pid; |
57 | static unsigned int core_pipe_limit; | |
58 | static char core_pattern[CORENAME_MAX_SIZE] = "core"; | |
3ceadcf6 | 59 | static int core_name_size = CORENAME_MAX_SIZE; |
10c28d93 AK |
60 | |
61 | struct core_name { | |
62 | char *corename; | |
63 | int used, size; | |
64 | }; | |
10c28d93 | 65 | |
3ceadcf6 | 66 | static int expand_corename(struct core_name *cn, int size) |
10c28d93 | 67 | { |
e7fd1549 | 68 | char *corename = krealloc(cn->corename, size, GFP_KERNEL); |
10c28d93 | 69 | |
e7fd1549 | 70 | if (!corename) |
10c28d93 | 71 | return -ENOMEM; |
10c28d93 | 72 | |
3ceadcf6 ON |
73 | if (size > core_name_size) /* racy but harmless */ |
74 | core_name_size = size; | |
75 | ||
76 | cn->size = ksize(corename); | |
e7fd1549 | 77 | cn->corename = corename; |
10c28d93 AK |
78 | return 0; |
79 | } | |
80 | ||
b4176b7c NI |
81 | static __printf(2, 0) int cn_vprintf(struct core_name *cn, const char *fmt, |
82 | va_list arg) | |
10c28d93 | 83 | { |
5fe9d8ca | 84 | int free, need; |
404ca80e | 85 | va_list arg_copy; |
10c28d93 | 86 | |
5fe9d8ca ON |
87 | again: |
88 | free = cn->size - cn->used; | |
404ca80e ED |
89 | |
90 | va_copy(arg_copy, arg); | |
91 | need = vsnprintf(cn->corename + cn->used, free, fmt, arg_copy); | |
92 | va_end(arg_copy); | |
93 | ||
5fe9d8ca ON |
94 | if (need < free) { |
95 | cn->used += need; | |
96 | return 0; | |
97 | } | |
10c28d93 | 98 | |
3ceadcf6 | 99 | if (!expand_corename(cn, cn->size + need - free + 1)) |
5fe9d8ca | 100 | goto again; |
10c28d93 | 101 | |
5fe9d8ca | 102 | return -ENOMEM; |
10c28d93 AK |
103 | } |
104 | ||
b4176b7c | 105 | static __printf(2, 3) int cn_printf(struct core_name *cn, const char *fmt, ...) |
bc03c691 ON |
106 | { |
107 | va_list arg; | |
108 | int ret; | |
109 | ||
110 | va_start(arg, fmt); | |
111 | ret = cn_vprintf(cn, fmt, arg); | |
112 | va_end(arg); | |
113 | ||
114 | return ret; | |
115 | } | |
116 | ||
b4176b7c NI |
117 | static __printf(2, 3) |
118 | int cn_esc_printf(struct core_name *cn, const char *fmt, ...) | |
10c28d93 | 119 | { |
923bed03 ON |
120 | int cur = cn->used; |
121 | va_list arg; | |
122 | int ret; | |
123 | ||
124 | va_start(arg, fmt); | |
125 | ret = cn_vprintf(cn, fmt, arg); | |
126 | va_end(arg); | |
127 | ||
ac94b6e3 JH |
128 | if (ret == 0) { |
129 | /* | |
130 | * Ensure that this coredump name component can't cause the | |
131 | * resulting corefile path to consist of a ".." or ".". | |
132 | */ | |
133 | if ((cn->used - cur == 1 && cn->corename[cur] == '.') || | |
134 | (cn->used - cur == 2 && cn->corename[cur] == '.' | |
135 | && cn->corename[cur+1] == '.')) | |
136 | cn->corename[cur] = '!'; | |
137 | ||
138 | /* | |
139 | * Empty names are fishy and could be used to create a "//" in a | |
140 | * corefile name, causing the coredump to happen one directory | |
141 | * level too high. Enforce that all components of the core | |
142 | * pattern are at least one character long. | |
143 | */ | |
144 | if (cn->used == cur) | |
145 | ret = cn_printf(cn, "!"); | |
146 | } | |
147 | ||
923bed03 ON |
148 | for (; cur < cn->used; ++cur) { |
149 | if (cn->corename[cur] == '/') | |
150 | cn->corename[cur] = '!'; | |
151 | } | |
152 | return ret; | |
10c28d93 AK |
153 | } |
154 | ||
f38c85f1 | 155 | static int cn_print_exe_file(struct core_name *cn, bool name_only) |
10c28d93 AK |
156 | { |
157 | struct file *exe_file; | |
f38c85f1 | 158 | char *pathbuf, *path, *ptr; |
10c28d93 AK |
159 | int ret; |
160 | ||
161 | exe_file = get_mm_exe_file(current->mm); | |
923bed03 ON |
162 | if (!exe_file) |
163 | return cn_esc_printf(cn, "%s (path unknown)", current->comm); | |
10c28d93 | 164 | |
0ee931c4 | 165 | pathbuf = kmalloc(PATH_MAX, GFP_KERNEL); |
10c28d93 AK |
166 | if (!pathbuf) { |
167 | ret = -ENOMEM; | |
168 | goto put_exe_file; | |
169 | } | |
170 | ||
9bf39ab2 | 171 | path = file_path(exe_file, pathbuf, PATH_MAX); |
10c28d93 AK |
172 | if (IS_ERR(path)) { |
173 | ret = PTR_ERR(path); | |
174 | goto free_buf; | |
175 | } | |
176 | ||
f38c85f1 LW |
177 | if (name_only) { |
178 | ptr = strrchr(path, '/'); | |
179 | if (ptr) | |
180 | path = ptr + 1; | |
181 | } | |
923bed03 | 182 | ret = cn_esc_printf(cn, "%s", path); |
10c28d93 AK |
183 | |
184 | free_buf: | |
185 | kfree(pathbuf); | |
186 | put_exe_file: | |
187 | fput(exe_file); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | /* format_corename will inspect the pattern parameter, and output a | |
192 | * name into corename, which must have space for at least | |
193 | * CORENAME_MAX_SIZE bytes plus one byte for the zero terminator. | |
194 | */ | |
315c6926 PW |
195 | static int format_corename(struct core_name *cn, struct coredump_params *cprm, |
196 | size_t **argv, int *argc) | |
10c28d93 AK |
197 | { |
198 | const struct cred *cred = current_cred(); | |
199 | const char *pat_ptr = core_pattern; | |
200 | int ispipe = (*pat_ptr == '|'); | |
315c6926 | 201 | bool was_space = false; |
10c28d93 AK |
202 | int pid_in_pattern = 0; |
203 | int err = 0; | |
204 | ||
e7fd1549 | 205 | cn->used = 0; |
3ceadcf6 ON |
206 | cn->corename = NULL; |
207 | if (expand_corename(cn, core_name_size)) | |
10c28d93 | 208 | return -ENOMEM; |
888ffc59 ON |
209 | cn->corename[0] = '\0'; |
210 | ||
315c6926 PW |
211 | if (ispipe) { |
212 | int argvs = sizeof(core_pattern) / 2; | |
213 | (*argv) = kmalloc_array(argvs, sizeof(**argv), GFP_KERNEL); | |
214 | if (!(*argv)) | |
215 | return -ENOMEM; | |
216 | (*argv)[(*argc)++] = 0; | |
888ffc59 | 217 | ++pat_ptr; |
db973a72 SM |
218 | if (!(*pat_ptr)) |
219 | return -ENOMEM; | |
315c6926 | 220 | } |
10c28d93 AK |
221 | |
222 | /* Repeat as long as we have more pattern to process and more output | |
223 | space */ | |
224 | while (*pat_ptr) { | |
315c6926 PW |
225 | /* |
226 | * Split on spaces before doing template expansion so that | |
227 | * %e and %E don't get split if they have spaces in them | |
228 | */ | |
229 | if (ispipe) { | |
230 | if (isspace(*pat_ptr)) { | |
2bf509d9 MD |
231 | if (cn->used != 0) |
232 | was_space = true; | |
315c6926 PW |
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 | ||
752dc970 | 349 | static int zap_process(struct task_struct *start, int exit_code) |
10c28d93 AK |
350 | { |
351 | struct task_struct *t; | |
352 | int nr = 0; | |
353 | ||
5fa534c9 | 354 | /* ignore all signals except SIGKILL, see prepare_signal() */ |
2f824d4d | 355 | start->signal->flags = SIGNAL_GROUP_EXIT; |
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 | 360 | task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK); |
92307383 | 361 | if (t != current && !(t->flags & PF_POSTCOREDUMP)) { |
10c28d93 AK |
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 | ||
0258b5fd | 371 | static int zap_threads(struct task_struct *tsk, |
403bad72 | 372 | struct core_state *core_state, int exit_code) |
10c28d93 | 373 | { |
49697335 | 374 | struct signal_struct *signal = tsk->signal; |
10c28d93 AK |
375 | int nr = -EAGAIN; |
376 | ||
377 | spin_lock_irq(&tsk->sighand->siglock); | |
49697335 EB |
378 | if (!(signal->flags & SIGNAL_GROUP_EXIT) && !signal->group_exec_task) { |
379 | signal->core_state = core_state; | |
752dc970 | 380 | nr = zap_process(tsk, exit_code); |
403bad72 | 381 | clear_tsk_thread_flag(tsk, TIF_SIGPENDING); |
0258b5fd EB |
382 | tsk->flags |= PF_DUMPCORE; |
383 | atomic_set(&core_state->nr_threads, nr); | |
10c28d93 AK |
384 | } |
385 | spin_unlock_irq(&tsk->sighand->siglock); | |
10c28d93 AK |
386 | return nr; |
387 | } | |
388 | ||
389 | static int coredump_wait(int exit_code, struct core_state *core_state) | |
390 | { | |
391 | struct task_struct *tsk = current; | |
10c28d93 AK |
392 | int core_waiters = -EBUSY; |
393 | ||
394 | init_completion(&core_state->startup); | |
395 | core_state->dumper.task = tsk; | |
396 | core_state->dumper.next = NULL; | |
397 | ||
0258b5fd | 398 | core_waiters = zap_threads(tsk, core_state, exit_code); |
10c28d93 AK |
399 | if (core_waiters > 0) { |
400 | struct core_thread *ptr; | |
401 | ||
70d78fe7 | 402 | freezer_do_not_count(); |
10c28d93 | 403 | wait_for_completion(&core_state->startup); |
70d78fe7 | 404 | freezer_count(); |
10c28d93 AK |
405 | /* |
406 | * Wait for all the threads to become inactive, so that | |
407 | * all the thread context (extended register state, like | |
408 | * fpu etc) gets copied to the memory. | |
409 | */ | |
410 | ptr = core_state->dumper.next; | |
411 | while (ptr != NULL) { | |
412 | wait_task_inactive(ptr->task, 0); | |
413 | ptr = ptr->next; | |
414 | } | |
415 | } | |
416 | ||
417 | return core_waiters; | |
418 | } | |
419 | ||
0258b5fd | 420 | static void coredump_finish(bool core_dumped) |
10c28d93 AK |
421 | { |
422 | struct core_thread *curr, *next; | |
423 | struct task_struct *task; | |
424 | ||
6cd8f0ac | 425 | spin_lock_irq(¤t->sighand->siglock); |
acdedd99 ON |
426 | if (core_dumped && !__fatal_signal_pending(current)) |
427 | current->signal->group_exit_code |= 0x80; | |
0258b5fd EB |
428 | next = current->signal->core_state->dumper.next; |
429 | current->signal->core_state = NULL; | |
6cd8f0ac ON |
430 | spin_unlock_irq(¤t->sighand->siglock); |
431 | ||
10c28d93 AK |
432 | while ((curr = next) != NULL) { |
433 | next = curr->next; | |
434 | task = curr->task; | |
435 | /* | |
92307383 | 436 | * see coredump_task_exit(), curr->task must not see |
10c28d93 AK |
437 | * ->task == NULL before we read ->next. |
438 | */ | |
439 | smp_mb(); | |
440 | curr->task = NULL; | |
441 | wake_up_process(task); | |
442 | } | |
10c28d93 AK |
443 | } |
444 | ||
528f827e ON |
445 | static bool dump_interrupted(void) |
446 | { | |
447 | /* | |
448 | * SIGKILL or freezing() interrupt the coredumping. Perhaps we | |
449 | * can do try_to_freeze() and check __fatal_signal_pending(), | |
450 | * but then we need to teach dump_write() to restart and clear | |
451 | * TIF_SIGPENDING. | |
452 | */ | |
06af8679 | 453 | return fatal_signal_pending(current) || freezing(current); |
528f827e ON |
454 | } |
455 | ||
10c28d93 AK |
456 | static void wait_for_dump_helpers(struct file *file) |
457 | { | |
de32ec4c | 458 | struct pipe_inode_info *pipe = file->private_data; |
10c28d93 AK |
459 | |
460 | pipe_lock(pipe); | |
461 | pipe->readers++; | |
462 | pipe->writers--; | |
0ddad21d | 463 | wake_up_interruptible_sync(&pipe->rd_wait); |
dc7ee2aa ON |
464 | kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN); |
465 | pipe_unlock(pipe); | |
10c28d93 | 466 | |
dc7ee2aa ON |
467 | /* |
468 | * We actually want wait_event_freezable() but then we need | |
469 | * to clear TIF_SIGPENDING and improve dump_interrupted(). | |
470 | */ | |
0ddad21d | 471 | wait_event_interruptible(pipe->rd_wait, pipe->readers == 1); |
10c28d93 | 472 | |
dc7ee2aa | 473 | pipe_lock(pipe); |
10c28d93 AK |
474 | pipe->readers--; |
475 | pipe->writers++; | |
476 | pipe_unlock(pipe); | |
10c28d93 AK |
477 | } |
478 | ||
479 | /* | |
480 | * umh_pipe_setup | |
481 | * helper function to customize the process used | |
482 | * to collect the core in userspace. Specifically | |
483 | * it sets up a pipe and installs it as fd 0 (stdin) | |
484 | * for the process. Returns 0 on success, or | |
485 | * PTR_ERR on failure. | |
486 | * Note that it also sets the core limit to 1. This | |
487 | * is a special value that we use to trap recursive | |
488 | * core dumps | |
489 | */ | |
490 | static int umh_pipe_setup(struct subprocess_info *info, struct cred *new) | |
491 | { | |
492 | struct file *files[2]; | |
493 | struct coredump_params *cp = (struct coredump_params *)info->data; | |
494 | int err = create_pipe_files(files, 0); | |
495 | if (err) | |
496 | return err; | |
497 | ||
498 | cp->file = files[1]; | |
499 | ||
45525b26 AV |
500 | err = replace_fd(0, files[0], 0); |
501 | fput(files[0]); | |
10c28d93 AK |
502 | /* and disallow core files too */ |
503 | current->signal->rlim[RLIMIT_CORE] = (struct rlimit){1, 1}; | |
504 | ||
45525b26 | 505 | return err; |
10c28d93 AK |
506 | } |
507 | ||
ae7795bc | 508 | void do_coredump(const kernel_siginfo_t *siginfo) |
10c28d93 AK |
509 | { |
510 | struct core_state core_state; | |
511 | struct core_name cn; | |
512 | struct mm_struct *mm = current->mm; | |
513 | struct linux_binfmt * binfmt; | |
514 | const struct cred *old_cred; | |
515 | struct cred *cred; | |
516 | int retval = 0; | |
10c28d93 | 517 | int ispipe; |
315c6926 PW |
518 | size_t *argv = NULL; |
519 | int argc = 0; | |
fbb18169 JH |
520 | /* require nonrelative corefile path and be extra careful */ |
521 | bool need_suid_safe = false; | |
acdedd99 | 522 | bool core_dumped = false; |
10c28d93 AK |
523 | static atomic_t core_dump_count = ATOMIC_INIT(0); |
524 | struct coredump_params cprm = { | |
5ab1c309 | 525 | .siginfo = siginfo, |
541880d9 | 526 | .regs = signal_pt_regs(), |
10c28d93 AK |
527 | .limit = rlimit(RLIMIT_CORE), |
528 | /* | |
529 | * We must use the same mm->flags while dumping core to avoid | |
530 | * inconsistency of bit flags, since this flag is not protected | |
531 | * by any locks. | |
532 | */ | |
533 | .mm_flags = mm->flags, | |
534 | }; | |
535 | ||
5ab1c309 | 536 | audit_core_dumps(siginfo->si_signo); |
10c28d93 AK |
537 | |
538 | binfmt = mm->binfmt; | |
539 | if (!binfmt || !binfmt->core_dump) | |
540 | goto fail; | |
541 | if (!__get_dumpable(cprm.mm_flags)) | |
542 | goto fail; | |
543 | ||
544 | cred = prepare_creds(); | |
545 | if (!cred) | |
546 | goto fail; | |
547 | /* | |
548 | * We cannot trust fsuid as being the "true" uid of the process | |
549 | * nor do we know its entire history. We only know it was tainted | |
550 | * so we dump it as root in mode 2, and only into a controlled | |
551 | * environment (pipe handler or fully qualified path). | |
552 | */ | |
e579d2c2 | 553 | if (__get_dumpable(cprm.mm_flags) == SUID_DUMP_ROOT) { |
10c28d93 | 554 | /* Setuid core dump mode */ |
10c28d93 | 555 | cred->fsuid = GLOBAL_ROOT_UID; /* Dump root private */ |
fbb18169 | 556 | need_suid_safe = true; |
10c28d93 AK |
557 | } |
558 | ||
5ab1c309 | 559 | retval = coredump_wait(siginfo->si_signo, &core_state); |
10c28d93 AK |
560 | if (retval < 0) |
561 | goto fail_creds; | |
562 | ||
563 | old_cred = override_creds(cred); | |
564 | ||
315c6926 | 565 | ispipe = format_corename(&cn, &cprm, &argv, &argc); |
10c28d93 | 566 | |
fb96c475 | 567 | if (ispipe) { |
315c6926 | 568 | int argi; |
10c28d93 AK |
569 | int dump_count; |
570 | char **helper_argv; | |
907ed132 | 571 | struct subprocess_info *sub_info; |
10c28d93 AK |
572 | |
573 | if (ispipe < 0) { | |
574 | printk(KERN_WARNING "format_corename failed\n"); | |
575 | printk(KERN_WARNING "Aborting core\n"); | |
e7fd1549 | 576 | goto fail_unlock; |
10c28d93 AK |
577 | } |
578 | ||
579 | if (cprm.limit == 1) { | |
580 | /* See umh_pipe_setup() which sets RLIMIT_CORE = 1. | |
581 | * | |
582 | * Normally core limits are irrelevant to pipes, since | |
583 | * we're not writing to the file system, but we use | |
fcbc32bc | 584 | * cprm.limit of 1 here as a special value, this is a |
10c28d93 AK |
585 | * consistent way to catch recursive crashes. |
586 | * We can still crash if the core_pattern binary sets | |
587 | * RLIM_CORE = !1, but it runs as root, and can do | |
588 | * lots of stupid things. | |
589 | * | |
590 | * Note that we use task_tgid_vnr here to grab the pid | |
591 | * of the process group leader. That way we get the | |
592 | * right pid if a thread in a multi-threaded | |
593 | * core_pattern process dies. | |
594 | */ | |
595 | printk(KERN_WARNING | |
596 | "Process %d(%s) has RLIMIT_CORE set to 1\n", | |
597 | task_tgid_vnr(current), current->comm); | |
598 | printk(KERN_WARNING "Aborting core\n"); | |
599 | goto fail_unlock; | |
600 | } | |
601 | cprm.limit = RLIM_INFINITY; | |
602 | ||
603 | dump_count = atomic_inc_return(&core_dump_count); | |
604 | if (core_pipe_limit && (core_pipe_limit < dump_count)) { | |
605 | printk(KERN_WARNING "Pid %d(%s) over core_pipe_limit\n", | |
606 | task_tgid_vnr(current), current->comm); | |
607 | printk(KERN_WARNING "Skipping core dump\n"); | |
608 | goto fail_dropcount; | |
609 | } | |
610 | ||
315c6926 PW |
611 | helper_argv = kmalloc_array(argc + 1, sizeof(*helper_argv), |
612 | GFP_KERNEL); | |
10c28d93 AK |
613 | if (!helper_argv) { |
614 | printk(KERN_WARNING "%s failed to allocate memory\n", | |
615 | __func__); | |
616 | goto fail_dropcount; | |
617 | } | |
315c6926 PW |
618 | for (argi = 0; argi < argc; argi++) |
619 | helper_argv[argi] = cn.corename + argv[argi]; | |
620 | helper_argv[argi] = NULL; | |
10c28d93 | 621 | |
907ed132 LDM |
622 | retval = -ENOMEM; |
623 | sub_info = call_usermodehelper_setup(helper_argv[0], | |
624 | helper_argv, NULL, GFP_KERNEL, | |
625 | umh_pipe_setup, NULL, &cprm); | |
626 | if (sub_info) | |
627 | retval = call_usermodehelper_exec(sub_info, | |
628 | UMH_WAIT_EXEC); | |
629 | ||
315c6926 | 630 | kfree(helper_argv); |
10c28d93 | 631 | if (retval) { |
888ffc59 | 632 | printk(KERN_INFO "Core dump to |%s pipe failed\n", |
10c28d93 AK |
633 | cn.corename); |
634 | goto close_fail; | |
fb96c475 | 635 | } |
10c28d93 | 636 | } else { |
643fe55a | 637 | struct user_namespace *mnt_userns; |
10c28d93 | 638 | struct inode *inode; |
378c6520 JH |
639 | int open_flags = O_CREAT | O_RDWR | O_NOFOLLOW | |
640 | O_LARGEFILE | O_EXCL; | |
10c28d93 AK |
641 | |
642 | if (cprm.limit < binfmt->min_coredump) | |
643 | goto fail_unlock; | |
644 | ||
fbb18169 | 645 | if (need_suid_safe && cn.corename[0] != '/') { |
10c28d93 AK |
646 | printk(KERN_WARNING "Pid %d(%s) can only dump core "\ |
647 | "to fully qualified path!\n", | |
648 | task_tgid_vnr(current), current->comm); | |
649 | printk(KERN_WARNING "Skipping core dump\n"); | |
650 | goto fail_unlock; | |
651 | } | |
652 | ||
fbb18169 JH |
653 | /* |
654 | * Unlink the file if it exists unless this is a SUID | |
655 | * binary - in that case, we're running around with root | |
656 | * privs and don't want to unlink another user's coredump. | |
657 | */ | |
658 | if (!need_suid_safe) { | |
fbb18169 JH |
659 | /* |
660 | * If it doesn't exist, that's fine. If there's some | |
661 | * other problem, we'll catch it at the filp_open(). | |
662 | */ | |
96271654 | 663 | do_unlinkat(AT_FDCWD, getname_kernel(cn.corename)); |
fbb18169 JH |
664 | } |
665 | ||
666 | /* | |
667 | * There is a race between unlinking and creating the | |
668 | * file, but if that causes an EEXIST here, that's | |
669 | * fine - another process raced with us while creating | |
670 | * the corefile, and the other process won. To userspace, | |
671 | * what matters is that at least one of the two processes | |
672 | * writes its coredump successfully, not which one. | |
673 | */ | |
378c6520 JH |
674 | if (need_suid_safe) { |
675 | /* | |
676 | * Using user namespaces, normal user tasks can change | |
677 | * their current->fs->root to point to arbitrary | |
678 | * directories. Since the intention of the "only dump | |
679 | * with a fully qualified path" rule is to control where | |
680 | * coredumps may be placed using root privileges, | |
681 | * current->fs->root must not be used. Instead, use the | |
682 | * root directory of init_task. | |
683 | */ | |
684 | struct path root; | |
685 | ||
686 | task_lock(&init_task); | |
687 | get_fs_root(init_task.fs, &root); | |
688 | task_unlock(&init_task); | |
ffb37ca3 AV |
689 | cprm.file = file_open_root(&root, cn.corename, |
690 | open_flags, 0600); | |
378c6520 JH |
691 | path_put(&root); |
692 | } else { | |
693 | cprm.file = filp_open(cn.corename, open_flags, 0600); | |
694 | } | |
10c28d93 AK |
695 | if (IS_ERR(cprm.file)) |
696 | goto fail_unlock; | |
697 | ||
496ad9aa | 698 | inode = file_inode(cprm.file); |
10c28d93 AK |
699 | if (inode->i_nlink > 1) |
700 | goto close_fail; | |
701 | if (d_unhashed(cprm.file->f_path.dentry)) | |
702 | goto close_fail; | |
703 | /* | |
704 | * AK: actually i see no reason to not allow this for named | |
705 | * pipes etc, but keep the previous behaviour for now. | |
706 | */ | |
707 | if (!S_ISREG(inode->i_mode)) | |
708 | goto close_fail; | |
709 | /* | |
40f705a7 JH |
710 | * Don't dump core if the filesystem changed owner or mode |
711 | * of the file during file creation. This is an issue when | |
712 | * a process dumps core while its cwd is e.g. on a vfat | |
713 | * filesystem. | |
10c28d93 | 714 | */ |
643fe55a | 715 | mnt_userns = file_mnt_user_ns(cprm.file); |
dbd9d6f8 DO |
716 | if (!uid_eq(i_uid_into_mnt(mnt_userns, inode), |
717 | current_fsuid())) { | |
718 | pr_info_ratelimited("Core dump to %s aborted: cannot preserve file owner\n", | |
719 | cn.corename); | |
10c28d93 | 720 | goto close_fail; |
dbd9d6f8 DO |
721 | } |
722 | if ((inode->i_mode & 0677) != 0600) { | |
723 | pr_info_ratelimited("Core dump to %s aborted: cannot preserve file permissions\n", | |
724 | cn.corename); | |
40f705a7 | 725 | goto close_fail; |
dbd9d6f8 | 726 | } |
86cc0584 | 727 | if (!(cprm.file->f_mode & FMODE_CAN_WRITE)) |
10c28d93 | 728 | goto close_fail; |
643fe55a CB |
729 | if (do_truncate(mnt_userns, cprm.file->f_path.dentry, |
730 | 0, 0, cprm.file)) | |
10c28d93 AK |
731 | goto close_fail; |
732 | } | |
733 | ||
734 | /* get us an unshared descriptor table; almost always a no-op */ | |
c39ab6de | 735 | /* The cell spufs coredump code reads the file descriptor tables */ |
1f702603 | 736 | retval = unshare_files(); |
10c28d93 AK |
737 | if (retval) |
738 | goto close_fail; | |
e86d35c3 | 739 | if (!dump_interrupted()) { |
3740d93e LC |
740 | /* |
741 | * umh disabled with CONFIG_STATIC_USERMODEHELPER_PATH="" would | |
742 | * have this set to NULL. | |
743 | */ | |
744 | if (!cprm.file) { | |
745 | pr_info("Core dump to |%s disabled\n", cn.corename); | |
746 | goto close_fail; | |
747 | } | |
e86d35c3 AV |
748 | file_start_write(cprm.file); |
749 | core_dumped = binfmt->core_dump(&cprm); | |
d0f1088b AV |
750 | /* |
751 | * Ensures that file size is big enough to contain the current | |
752 | * file postion. This prevents gdb from complaining about | |
753 | * a truncated file if the last "write" to the file was | |
754 | * dump_skip. | |
755 | */ | |
756 | if (cprm.to_skip) { | |
757 | cprm.to_skip--; | |
758 | dump_emit(&cprm, "", 1); | |
759 | } | |
e86d35c3 AV |
760 | file_end_write(cprm.file); |
761 | } | |
10c28d93 AK |
762 | if (ispipe && core_pipe_limit) |
763 | wait_for_dump_helpers(cprm.file); | |
764 | close_fail: | |
765 | if (cprm.file) | |
766 | filp_close(cprm.file, NULL); | |
767 | fail_dropcount: | |
768 | if (ispipe) | |
769 | atomic_dec(&core_dump_count); | |
770 | fail_unlock: | |
315c6926 | 771 | kfree(argv); |
10c28d93 | 772 | kfree(cn.corename); |
0258b5fd | 773 | coredump_finish(core_dumped); |
10c28d93 AK |
774 | revert_creds(old_cred); |
775 | fail_creds: | |
776 | put_cred(cred); | |
777 | fail: | |
778 | return; | |
779 | } | |
780 | ||
781 | /* | |
782 | * Core dumping helper functions. These are the only things you should | |
783 | * do on a core-file: use only these functions to write out all the | |
784 | * necessary info. | |
785 | */ | |
d0f1088b | 786 | static int __dump_emit(struct coredump_params *cprm, const void *addr, int nr) |
ecc8c772 AV |
787 | { |
788 | struct file *file = cprm->file; | |
2507a4fb AV |
789 | loff_t pos = file->f_pos; |
790 | ssize_t n; | |
2c4cb043 | 791 | if (cprm->written + nr > cprm->limit) |
ecc8c772 | 792 | return 0; |
df0c09c0 JH |
793 | |
794 | ||
795 | if (dump_interrupted()) | |
796 | return 0; | |
797 | n = __kernel_write(file, addr, nr, &pos); | |
798 | if (n != nr) | |
799 | return 0; | |
800 | file->f_pos = pos; | |
801 | cprm->written += n; | |
802 | cprm->pos += n; | |
803 | ||
ecc8c772 AV |
804 | return 1; |
805 | } | |
ecc8c772 | 806 | |
d0f1088b | 807 | static int __dump_skip(struct coredump_params *cprm, size_t nr) |
10c28d93 | 808 | { |
9b56d543 AV |
809 | static char zeroes[PAGE_SIZE]; |
810 | struct file *file = cprm->file; | |
10c28d93 | 811 | if (file->f_op->llseek && file->f_op->llseek != no_llseek) { |
528f827e | 812 | if (dump_interrupted() || |
9b56d543 | 813 | file->f_op->llseek(file, nr, SEEK_CUR) < 0) |
10c28d93 | 814 | return 0; |
1607f09c | 815 | cprm->pos += nr; |
9b56d543 | 816 | return 1; |
10c28d93 | 817 | } else { |
9b56d543 | 818 | while (nr > PAGE_SIZE) { |
d0f1088b | 819 | if (!__dump_emit(cprm, zeroes, PAGE_SIZE)) |
9b56d543 AV |
820 | return 0; |
821 | nr -= PAGE_SIZE; | |
10c28d93 | 822 | } |
d0f1088b | 823 | return __dump_emit(cprm, zeroes, nr); |
10c28d93 | 824 | } |
10c28d93 | 825 | } |
d0f1088b AV |
826 | |
827 | int dump_emit(struct coredump_params *cprm, const void *addr, int nr) | |
828 | { | |
829 | if (cprm->to_skip) { | |
830 | if (!__dump_skip(cprm, cprm->to_skip)) | |
831 | return 0; | |
832 | cprm->to_skip = 0; | |
833 | } | |
834 | return __dump_emit(cprm, addr, nr); | |
835 | } | |
836 | EXPORT_SYMBOL(dump_emit); | |
837 | ||
838 | void dump_skip_to(struct coredump_params *cprm, unsigned long pos) | |
839 | { | |
840 | cprm->to_skip = pos - cprm->pos; | |
841 | } | |
842 | EXPORT_SYMBOL(dump_skip_to); | |
843 | ||
844 | void dump_skip(struct coredump_params *cprm, size_t nr) | |
845 | { | |
846 | cprm->to_skip += nr; | |
847 | } | |
9b56d543 | 848 | EXPORT_SYMBOL(dump_skip); |
22a8cb82 | 849 | |
afc63a97 JH |
850 | #ifdef CONFIG_ELF_CORE |
851 | int dump_user_range(struct coredump_params *cprm, unsigned long start, | |
852 | unsigned long len) | |
853 | { | |
854 | unsigned long addr; | |
855 | ||
856 | for (addr = start; addr < start + len; addr += PAGE_SIZE) { | |
857 | struct page *page; | |
858 | int stop; | |
859 | ||
860 | /* | |
861 | * To avoid having to allocate page tables for virtual address | |
862 | * ranges that have never been used yet, and also to make it | |
863 | * easy to generate sparse core files, use a helper that returns | |
864 | * NULL when encountering an empty page table entry that would | |
865 | * otherwise have been filled with the zero page. | |
866 | */ | |
867 | page = get_dump_page(addr); | |
868 | if (page) { | |
3159ed57 | 869 | void *kaddr = kmap_local_page(page); |
afc63a97 JH |
870 | |
871 | stop = !dump_emit(cprm, kaddr, PAGE_SIZE); | |
3159ed57 | 872 | kunmap_local(kaddr); |
afc63a97 | 873 | put_page(page); |
d0f1088b AV |
874 | if (stop) |
875 | return 0; | |
afc63a97 | 876 | } else { |
d0f1088b | 877 | dump_skip(cprm, PAGE_SIZE); |
afc63a97 | 878 | } |
afc63a97 JH |
879 | } |
880 | return 1; | |
881 | } | |
882 | #endif | |
883 | ||
22a8cb82 AV |
884 | int dump_align(struct coredump_params *cprm, int align) |
885 | { | |
d0f1088b | 886 | unsigned mod = (cprm->pos + cprm->to_skip) & (align - 1); |
22a8cb82 | 887 | if (align & (align - 1)) |
db51242d | 888 | return 0; |
d0f1088b AV |
889 | if (mod) |
890 | cprm->to_skip += align - mod; | |
891 | return 1; | |
22a8cb82 AV |
892 | } |
893 | EXPORT_SYMBOL(dump_align); | |
4d22c75d | 894 | |
f0bc21b2 XN |
895 | #ifdef CONFIG_SYSCTL |
896 | ||
897 | void validate_coredump_safety(void) | |
898 | { | |
899 | if (suid_dumpable == SUID_DUMP_ROOT && | |
900 | core_pattern[0] != '/' && core_pattern[0] != '|') { | |
901 | pr_warn( | |
902 | "Unsafe core_pattern used with fs.suid_dumpable=2.\n" | |
903 | "Pipe handler or fully qualified core dump path required.\n" | |
904 | "Set kernel.core_pattern before fs.suid_dumpable.\n" | |
905 | ); | |
906 | } | |
907 | } | |
908 | ||
909 | static int proc_dostring_coredump(struct ctl_table *table, int write, | |
910 | void *buffer, size_t *lenp, loff_t *ppos) | |
911 | { | |
912 | int error = proc_dostring(table, write, buffer, lenp, ppos); | |
913 | ||
914 | if (!error) | |
915 | validate_coredump_safety(); | |
916 | return error; | |
917 | } | |
918 | ||
919 | static struct ctl_table coredump_sysctls[] = { | |
920 | { | |
921 | .procname = "core_uses_pid", | |
922 | .data = &core_uses_pid, | |
923 | .maxlen = sizeof(int), | |
924 | .mode = 0644, | |
925 | .proc_handler = proc_dointvec, | |
926 | }, | |
927 | { | |
928 | .procname = "core_pattern", | |
929 | .data = core_pattern, | |
930 | .maxlen = CORENAME_MAX_SIZE, | |
931 | .mode = 0644, | |
932 | .proc_handler = proc_dostring_coredump, | |
933 | }, | |
934 | { | |
935 | .procname = "core_pipe_limit", | |
936 | .data = &core_pipe_limit, | |
937 | .maxlen = sizeof(unsigned int), | |
938 | .mode = 0644, | |
939 | .proc_handler = proc_dointvec, | |
940 | }, | |
941 | { } | |
942 | }; | |
943 | ||
944 | static int __init init_fs_coredump_sysctls(void) | |
945 | { | |
946 | register_sysctl_init("kernel", coredump_sysctls); | |
947 | return 0; | |
948 | } | |
949 | fs_initcall(init_fs_coredump_sysctls); | |
950 | #endif /* CONFIG_SYSCTL */ | |
951 | ||
429a22e7 JH |
952 | /* |
953 | * The purpose of always_dump_vma() is to make sure that special kernel mappings | |
954 | * that are useful for post-mortem analysis are included in every core dump. | |
955 | * In that way we ensure that the core dump is fully interpretable later | |
956 | * without matching up the same kernel and hardware config to see what PC values | |
957 | * meant. These special mappings include - vDSO, vsyscall, and other | |
958 | * architecture specific mappings | |
959 | */ | |
960 | static bool always_dump_vma(struct vm_area_struct *vma) | |
961 | { | |
962 | /* Any vsyscall mappings? */ | |
963 | if (vma == get_gate_vma(vma->vm_mm)) | |
964 | return true; | |
965 | ||
966 | /* | |
967 | * Assume that all vmas with a .name op should always be dumped. | |
968 | * If this changes, a new vm_ops field can easily be added. | |
969 | */ | |
970 | if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma)) | |
971 | return true; | |
972 | ||
973 | /* | |
974 | * arch_vma_name() returns non-NULL for special architecture mappings, | |
975 | * such as vDSO sections. | |
976 | */ | |
977 | if (arch_vma_name(vma)) | |
978 | return true; | |
979 | ||
980 | return false; | |
981 | } | |
982 | ||
983 | /* | |
984 | * Decide how much of @vma's contents should be included in a core dump. | |
985 | */ | |
a07279c9 JH |
986 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
987 | unsigned long mm_flags) | |
429a22e7 JH |
988 | { |
989 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) | |
990 | ||
991 | /* always dump the vdso and vsyscall sections */ | |
992 | if (always_dump_vma(vma)) | |
993 | goto whole; | |
994 | ||
995 | if (vma->vm_flags & VM_DONTDUMP) | |
996 | return 0; | |
997 | ||
998 | /* support for DAX */ | |
999 | if (vma_is_dax(vma)) { | |
1000 | if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED)) | |
1001 | goto whole; | |
1002 | if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE)) | |
1003 | goto whole; | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | /* Hugetlb memory check */ | |
1008 | if (is_vm_hugetlb_page(vma)) { | |
1009 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
1010 | goto whole; | |
1011 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
1012 | goto whole; | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | /* Do not dump I/O mapped devices or special mappings */ | |
1017 | if (vma->vm_flags & VM_IO) | |
1018 | return 0; | |
1019 | ||
1020 | /* By default, dump shared memory if mapped from an anonymous file. */ | |
1021 | if (vma->vm_flags & VM_SHARED) { | |
1022 | if (file_inode(vma->vm_file)->i_nlink == 0 ? | |
1023 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) | |
1024 | goto whole; | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | /* Dump segments that have been written to. */ | |
1029 | if ((!IS_ENABLED(CONFIG_MMU) || vma->anon_vma) && FILTER(ANON_PRIVATE)) | |
1030 | goto whole; | |
1031 | if (vma->vm_file == NULL) | |
1032 | return 0; | |
1033 | ||
1034 | if (FILTER(MAPPED_PRIVATE)) | |
1035 | goto whole; | |
1036 | ||
1037 | /* | |
1038 | * If this is the beginning of an executable file mapping, | |
1039 | * dump the first page to aid in determining what was mapped here. | |
1040 | */ | |
1041 | if (FILTER(ELF_HEADERS) && | |
1042 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ) && | |
1043 | (READ_ONCE(file_inode(vma->vm_file)->i_mode) & 0111) != 0) | |
1044 | return PAGE_SIZE; | |
1045 | ||
1046 | #undef FILTER | |
1047 | ||
1048 | return 0; | |
1049 | ||
1050 | whole: | |
1051 | return vma->vm_end - vma->vm_start; | |
1052 | } | |
a07279c9 JH |
1053 | |
1054 | static struct vm_area_struct *first_vma(struct task_struct *tsk, | |
1055 | struct vm_area_struct *gate_vma) | |
1056 | { | |
1057 | struct vm_area_struct *ret = tsk->mm->mmap; | |
1058 | ||
1059 | if (ret) | |
1060 | return ret; | |
1061 | return gate_vma; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Helper function for iterating across a vma list. It ensures that the caller | |
1066 | * will visit `gate_vma' prior to terminating the search. | |
1067 | */ | |
1068 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
1069 | struct vm_area_struct *gate_vma) | |
1070 | { | |
1071 | struct vm_area_struct *ret; | |
1072 | ||
1073 | ret = this_vma->vm_next; | |
1074 | if (ret) | |
1075 | return ret; | |
1076 | if (this_vma == gate_vma) | |
1077 | return NULL; | |
1078 | return gate_vma; | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * Under the mmap_lock, take a snapshot of relevant information about the task's | |
1083 | * VMAs. | |
1084 | */ | |
1085 | int dump_vma_snapshot(struct coredump_params *cprm, int *vma_count, | |
1086 | struct core_vma_metadata **vma_meta, | |
1087 | size_t *vma_data_size_ptr) | |
1088 | { | |
1089 | struct vm_area_struct *vma, *gate_vma; | |
1090 | struct mm_struct *mm = current->mm; | |
1091 | int i; | |
1092 | size_t vma_data_size = 0; | |
1093 | ||
1094 | /* | |
1095 | * Once the stack expansion code is fixed to not change VMA bounds | |
1096 | * under mmap_lock in read mode, this can be changed to take the | |
1097 | * mmap_lock in read mode. | |
1098 | */ | |
1099 | if (mmap_write_lock_killable(mm)) | |
1100 | return -EINTR; | |
1101 | ||
1102 | gate_vma = get_gate_vma(mm); | |
1103 | *vma_count = mm->map_count + (gate_vma ? 1 : 0); | |
1104 | ||
1105 | *vma_meta = kvmalloc_array(*vma_count, sizeof(**vma_meta), GFP_KERNEL); | |
1106 | if (!*vma_meta) { | |
1107 | mmap_write_unlock(mm); | |
1108 | return -ENOMEM; | |
1109 | } | |
1110 | ||
1111 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; | |
1112 | vma = next_vma(vma, gate_vma), i++) { | |
1113 | struct core_vma_metadata *m = (*vma_meta) + i; | |
1114 | ||
1115 | m->start = vma->vm_start; | |
1116 | m->end = vma->vm_end; | |
1117 | m->flags = vma->vm_flags; | |
1118 | m->dump_size = vma_dump_size(vma, cprm->mm_flags); | |
1119 | ||
1120 | vma_data_size += m->dump_size; | |
1121 | } | |
1122 | ||
1123 | mmap_write_unlock(mm); | |
1124 | ||
6fcac87e Q |
1125 | if (WARN_ON(i != *vma_count)) { |
1126 | kvfree(*vma_meta); | |
a07279c9 | 1127 | return -EFAULT; |
6fcac87e | 1128 | } |
a07279c9 JH |
1129 | |
1130 | *vma_data_size_ptr = vma_data_size; | |
1131 | return 0; | |
1132 | } |