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f5e04665 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2012 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
f5e04665 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
f5e04665 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
f5e04665 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <unistd.h> | |
803a3464 LP |
24 | #include <stdio.h> |
25 | #include <sys/prctl.h> | |
34c10968 | 26 | #include <sys/types.h> |
cacd6403 | 27 | #include <sys/xattr.h> |
f5e04665 | 28 | |
4d229b31 UTL |
29 | #ifdef HAVE_ELFUTILS |
30 | # include <dwarf.h> | |
31 | # include <elfutils/libdwfl.h> | |
32 | #endif | |
33 | ||
73f860db ZJS |
34 | #include "systemd/sd-journal.h" |
35 | #include "systemd/sd-login.h" | |
f5e04665 LP |
36 | |
37 | #include "log.h" | |
38 | #include "util.h" | |
3f132692 | 39 | #include "fileio.h" |
1eef15b1 | 40 | #include "strv.h" |
b7f7c685 | 41 | #include "macro.h" |
49e942b2 | 42 | #include "mkdir.h" |
803a3464 | 43 | #include "special.h" |
ba1261bc | 44 | #include "cgroup-util.h" |
d18d46ec | 45 | #include "journald-native.h" |
34c10968 LP |
46 | #include "conf-parser.h" |
47 | #include "copy.h" | |
8d4e028f | 48 | #include "stacktrace.h" |
6388c315 | 49 | #include "path-util.h" |
cfd652ed | 50 | #include "compress.h" |
0dc5d23c | 51 | #include "coredump-vacuum.h" |
34c10968 LP |
52 | |
53 | #ifdef HAVE_ACL | |
34727273 ZJS |
54 | # include <sys/acl.h> |
55 | # include "acl-util.h" | |
56 | #endif | |
57 | ||
34c10968 LP |
58 | /* The maximum size up to which we process coredumps */ |
59 | #define PROCESS_SIZE_MAX ((off_t) (2LLU*1024LLU*1024LLU*1024LLU)) | |
60 | ||
61 | /* The maximum size up to which we leave the coredump around on | |
62 | * disk */ | |
63 | #define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX | |
64 | ||
65 | /* The maximum size up to which we store the coredump in the | |
66 | * journal */ | |
67 | #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) | |
f5e04665 | 68 | |
c4aa09b0 | 69 | /* Make sure to not make this larger than the maximum journal entry |
874bc134 ZJS |
70 | * size. See DATA_SIZE_MAX in journald-native.c. */ |
71 | assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); | |
f5e04665 LP |
72 | |
73 | enum { | |
1eef15b1 ZJS |
74 | INFO_PID, |
75 | INFO_UID, | |
76 | INFO_GID, | |
77 | INFO_SIGNAL, | |
78 | INFO_TIMESTAMP, | |
79 | INFO_COMM, | |
80 | INFO_EXE, | |
81 | _INFO_LEN | |
f5e04665 LP |
82 | }; |
83 | ||
34c10968 LP |
84 | typedef enum CoredumpStorage { |
85 | COREDUMP_STORAGE_NONE, | |
86 | COREDUMP_STORAGE_EXTERNAL, | |
87 | COREDUMP_STORAGE_JOURNAL, | |
88 | COREDUMP_STORAGE_BOTH, | |
89 | _COREDUMP_STORAGE_MAX, | |
90 | _COREDUMP_STORAGE_INVALID = -1 | |
91 | } CoredumpStorage; | |
92 | ||
34c10968 LP |
93 | static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = { |
94 | [COREDUMP_STORAGE_NONE] = "none", | |
95 | [COREDUMP_STORAGE_EXTERNAL] = "external", | |
96 | [COREDUMP_STORAGE_JOURNAL] = "journal", | |
97 | [COREDUMP_STORAGE_BOTH] = "both", | |
98 | }; | |
99 | ||
100 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage); | |
8c9571d0 | 101 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting"); |
34727273 ZJS |
102 | |
103 | static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
8c9571d0 | 104 | static bool arg_compress = true; |
34727273 ZJS |
105 | static off_t arg_process_size_max = PROCESS_SIZE_MAX; |
106 | static off_t arg_external_size_max = EXTERNAL_SIZE_MAX; | |
107 | static size_t arg_journal_size_max = JOURNAL_SIZE_MAX; | |
0dc5d23c LP |
108 | static off_t arg_keep_free = (off_t) -1; |
109 | static off_t arg_max_use = (off_t) -1; | |
34c10968 LP |
110 | |
111 | static int parse_config(void) { | |
34c10968 | 112 | static const ConfigTableItem items[] = { |
8c9571d0 LP |
113 | { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, |
114 | { "Coredump", "Compress", config_parse_bool, 0, &arg_compress }, | |
115 | { "Coredump", "ProcessSizeMax", config_parse_iec_off, 0, &arg_process_size_max }, | |
116 | { "Coredump", "ExternalSizeMax", config_parse_iec_off, 0, &arg_external_size_max }, | |
117 | { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, | |
118 | { "Coredump", "KeepFree", config_parse_iec_off, 0, &arg_keep_free }, | |
119 | { "Coredump", "MaxUse", config_parse_iec_off, 0, &arg_max_use }, | |
34c10968 LP |
120 | {} |
121 | }; | |
122 | ||
36f822c4 ZJS |
123 | return config_parse(NULL, "/etc/systemd/coredump.conf", NULL, |
124 | "Coredump\0", | |
125 | config_item_table_lookup, items, | |
126 | false, false, true, NULL); | |
34c10968 LP |
127 | } |
128 | ||
129 | static int fix_acl(int fd, uid_t uid) { | |
130 | ||
131 | #ifdef HAVE_ACL | |
132 | _cleanup_(acl_freep) acl_t acl = NULL; | |
133 | acl_entry_t entry; | |
134 | acl_permset_t permset; | |
135 | ||
b59233e6 LP |
136 | assert(fd >= 0); |
137 | ||
34c10968 LP |
138 | if (uid <= SYSTEM_UID_MAX) |
139 | return 0; | |
140 | ||
141 | /* Make sure normal users can read (but not write or delete) | |
142 | * their own coredumps */ | |
143 | ||
144 | acl = acl_get_fd(fd); | |
145 | if (!acl) { | |
146 | log_error("Failed to get ACL: %m"); | |
147 | return -errno; | |
148 | } | |
149 | ||
150 | if (acl_create_entry(&acl, &entry) < 0 || | |
151 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
152 | acl_set_qualifier(entry, &uid) < 0) { | |
153 | log_error("Failed to patch ACL: %m"); | |
154 | return -errno; | |
155 | } | |
156 | ||
157 | if (acl_get_permset(entry, &permset) < 0 || | |
158 | acl_add_perm(permset, ACL_READ) < 0 || | |
159 | calc_acl_mask_if_needed(&acl) < 0) { | |
160 | log_warning("Failed to patch ACL: %m"); | |
161 | return -errno; | |
162 | } | |
163 | ||
164 | if (acl_set_fd(fd, acl) < 0) { | |
165 | log_error("Failed to apply ACL: %m"); | |
166 | return -errno; | |
167 | } | |
168 | #endif | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
1eef15b1 | 173 | static int fix_xattr(int fd, const char *info[_INFO_LEN]) { |
0cd77f97 | 174 | |
1eef15b1 ZJS |
175 | static const char * const xattrs[_INFO_LEN] = { |
176 | [INFO_PID] = "user.coredump.pid", | |
177 | [INFO_UID] = "user.coredump.uid", | |
178 | [INFO_GID] = "user.coredump.gid", | |
179 | [INFO_SIGNAL] = "user.coredump.signal", | |
180 | [INFO_TIMESTAMP] = "user.coredump.timestamp", | |
181 | [INFO_COMM] = "user.coredump.comm", | |
182 | [INFO_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
183 | }; |
184 | ||
34c10968 | 185 | int r = 0; |
0cd77f97 | 186 | unsigned i; |
34c10968 | 187 | |
b59233e6 LP |
188 | assert(fd >= 0); |
189 | ||
1eef15b1 | 190 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
191 | * attributes. Just because we can. */ |
192 | ||
1eef15b1 ZJS |
193 | for (i = 0; i < _INFO_LEN; i++) { |
194 | int k; | |
195 | ||
196 | if (isempty(info[i]) || !xattrs[i]) | |
0cd77f97 | 197 | continue; |
34c10968 | 198 | |
1eef15b1 ZJS |
199 | k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); |
200 | if (k < 0 && r == 0) | |
34c10968 | 201 | r = -errno; |
0cd77f97 | 202 | } |
34c10968 LP |
203 | |
204 | return r; | |
205 | } | |
206 | ||
b0b21dce | 207 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 208 | |
b59233e6 LP |
209 | static int fix_permissions( |
210 | int fd, | |
211 | const char *filename, | |
212 | const char *target, | |
213 | const char *info[_INFO_LEN], | |
214 | uid_t uid) { | |
215 | ||
216 | assert(fd >= 0); | |
217 | assert(filename); | |
218 | assert(target); | |
219 | assert(info); | |
cfd652ed ZJS |
220 | |
221 | /* Ignore errors on these */ | |
222 | fchmod(fd, 0640); | |
223 | fix_acl(fd, uid); | |
224 | fix_xattr(fd, info); | |
225 | ||
226 | if (fsync(fd) < 0) { | |
227 | log_error("Failed to sync coredump %s: %m", filename); | |
228 | return -errno; | |
229 | } | |
230 | ||
231 | if (rename(filename, target) < 0) { | |
232 | log_error("Failed to rename coredump %s -> %s: %m", filename, target); | |
233 | return -errno; | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int maybe_remove_external_coredump(const char *filename, off_t size) { | |
240 | ||
b59233e6 | 241 | /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
cfd652ed ZJS |
242 | |
243 | if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && | |
244 | size <= arg_external_size_max) | |
245 | return 0; | |
246 | ||
247 | if (!filename) | |
248 | return 1; | |
249 | ||
9d951bf4 | 250 | if (unlink(filename) < 0 && errno != ENOENT) { |
cfd652ed ZJS |
251 | log_error("Failed to unlink %s: %m", filename); |
252 | return -errno; | |
253 | } | |
254 | ||
255 | return 1; | |
256 | } | |
257 | ||
b59233e6 LP |
258 | static int make_filename(const char *info[_INFO_LEN], char **ret) { |
259 | _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; | |
34c10968 | 260 | sd_id128_t boot; |
34c10968 LP |
261 | int r; |
262 | ||
1eef15b1 | 263 | assert(info); |
34c10968 | 264 | |
1eef15b1 | 265 | c = filename_escape(info[INFO_COMM]); |
34c10968 | 266 | if (!c) |
b59233e6 | 267 | return -ENOMEM; |
34c10968 | 268 | |
0dc5d23c LP |
269 | u = filename_escape(info[INFO_UID]); |
270 | if (!u) | |
b59233e6 | 271 | return -ENOMEM; |
34c10968 LP |
272 | |
273 | r = sd_id128_get_boot(&boot); | |
b59233e6 | 274 | if (r < 0) |
34c10968 | 275 | return r; |
34c10968 | 276 | |
b59233e6 LP |
277 | p = filename_escape(info[INFO_PID]); |
278 | if (!p) | |
279 | return -ENOMEM; | |
280 | ||
281 | t = filename_escape(info[INFO_TIMESTAMP]); | |
282 | if (!t) | |
283 | return -ENOMEM; | |
284 | ||
285 | if (asprintf(ret, | |
0dc5d23c | 286 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
34c10968 | 287 | c, |
0dc5d23c | 288 | u, |
34c10968 LP |
289 | SD_ID128_FORMAT_VAL(boot), |
290 | p, | |
b59233e6 LP |
291 | t) < 0) |
292 | return -ENOMEM; | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | static int save_external_coredump( | |
298 | const char *info[_INFO_LEN], | |
299 | uid_t uid, | |
300 | char **ret_filename, | |
301 | int *ret_fd, | |
302 | off_t *ret_size) { | |
303 | ||
304 | _cleanup_free_ char *fn = NULL, *tmp = NULL; | |
305 | _cleanup_close_ int fd = -1; | |
306 | struct stat st; | |
307 | int r; | |
308 | ||
309 | assert(info); | |
310 | assert(ret_filename); | |
311 | assert(ret_fd); | |
312 | assert(ret_size); | |
313 | ||
314 | r = make_filename(info, &fn); | |
315 | if (r < 0) { | |
316 | log_error("Failed to determine coredump file name: %s", strerror(-r)); | |
317 | return r; | |
318 | } | |
34c10968 LP |
319 | |
320 | tmp = tempfn_random(fn); | |
321 | if (!tmp) | |
322 | return log_oom(); | |
803a3464 | 323 | |
d2e54fae | 324 | mkdir_p_label("/var/lib/systemd/coredump", 0755); |
803a3464 | 325 | |
34c10968 LP |
326 | fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
327 | if (fd < 0) { | |
cfd652ed | 328 | log_error("Failed to create coredump file %s: %m", tmp); |
803a3464 LP |
329 | return -errno; |
330 | } | |
331 | ||
93240d3a | 332 | r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max); |
84ee0960 | 333 | if (r == -EFBIG) { |
0dc5d23c | 334 | log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
335 | goto fail; |
336 | } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { | |
0dc5d23c | 337 | log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
338 | goto fail; |
339 | } else if (r < 0) { | |
34c10968 LP |
340 | log_error("Failed to dump coredump to file: %s", strerror(-r)); |
341 | goto fail; | |
342 | } | |
803a3464 | 343 | |
34c10968 | 344 | if (fstat(fd, &st) < 0) { |
1eef15b1 | 345 | log_error("Failed to fstat coredump %s: %m", tmp); |
34c10968 LP |
346 | goto fail; |
347 | } | |
348 | ||
7849c2ac TA |
349 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
350 | log_error("Failed to seek on %s: %m", tmp); | |
b59233e6 | 351 | goto fail; |
7849c2ac TA |
352 | } |
353 | ||
d89c8fdf | 354 | #if defined(HAVE_XZ) || defined(HAVE_LZ4) |
cfd652ed | 355 | /* If we will remove the coredump anyway, do not compress. */ |
34727273 | 356 | if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
8c9571d0 | 357 | && arg_compress) { |
cfd652ed | 358 | |
b59233e6 LP |
359 | _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
360 | _cleanup_close_ int fd_compressed = -1; | |
cfd652ed | 361 | |
d89c8fdf | 362 | fn_compressed = strappend(fn, COMPRESSED_EXT); |
b59233e6 | 363 | if (!fn_compressed) { |
d89c8fdf | 364 | log_oom(); |
cfd652ed ZJS |
365 | goto uncompressed; |
366 | } | |
367 | ||
b59233e6 LP |
368 | tmp_compressed = tempfn_random(fn_compressed); |
369 | if (!tmp_compressed) { | |
d89c8fdf | 370 | log_oom(); |
b59233e6 | 371 | goto uncompressed; |
cfd652ed ZJS |
372 | } |
373 | ||
b59233e6 LP |
374 | fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
375 | if (fd_compressed < 0) { | |
376 | log_error("Failed to create file %s: %m", tmp_compressed); | |
377 | goto uncompressed; | |
cfd652ed ZJS |
378 | } |
379 | ||
d89c8fdf | 380 | r = compress_stream(fd, fd_compressed, -1); |
b59233e6 LP |
381 | if (r < 0) { |
382 | log_error("Failed to compress %s: %s", tmp_compressed, strerror(-r)); | |
383 | goto fail_compressed; | |
384 | } | |
385 | ||
386 | r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid); | |
cfd652ed | 387 | if (r < 0) |
b59233e6 LP |
388 | goto fail_compressed; |
389 | ||
390 | /* OK, this worked, we can get rid of the uncompressed version now */ | |
391 | unlink_noerrno(tmp); | |
cfd652ed | 392 | |
b59233e6 LP |
393 | *ret_filename = fn_compressed; /* compressed */ |
394 | *ret_fd = fd; /* uncompressed */ | |
395 | *ret_size = st.st_size; /* uncompressed */ | |
cfd652ed | 396 | |
b59233e6 | 397 | fn_compressed = NULL; |
cfd652ed ZJS |
398 | fd = -1; |
399 | ||
400 | return 0; | |
401 | ||
b59233e6 LP |
402 | fail_compressed: |
403 | unlink_noerrno(tmp_compressed); | |
34c10968 | 404 | } |
cfd652ed ZJS |
405 | |
406 | uncompressed: | |
3b1a55e1 | 407 | #endif |
cfd652ed ZJS |
408 | r = fix_permissions(fd, tmp, fn, info, uid); |
409 | if (r < 0) | |
410 | goto fail; | |
34c10968 LP |
411 | |
412 | *ret_filename = fn; | |
413 | *ret_fd = fd; | |
414 | *ret_size = st.st_size; | |
415 | ||
416 | fn = NULL; | |
417 | fd = -1; | |
418 | ||
419 | return 0; | |
420 | ||
421 | fail: | |
422 | unlink_noerrno(tmp); | |
423 | return r; | |
424 | } | |
425 | ||
426 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
427 | _cleanup_free_ char *field = NULL; | |
428 | ssize_t n; | |
429 | ||
8d4e028f | 430 | assert(fd >= 0); |
34c10968 LP |
431 | assert(ret); |
432 | assert(ret_size); | |
433 | ||
434 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { | |
435 | log_warning("Failed to seek: %m"); | |
436 | return -errno; | |
803a3464 LP |
437 | } |
438 | ||
34c10968 LP |
439 | field = malloc(9 + size); |
440 | if (!field) { | |
cfd652ed | 441 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
442 | return -ENOMEM; |
443 | } | |
444 | ||
445 | memcpy(field, "COREDUMP=", 9); | |
446 | ||
447 | n = read(fd, field + 9, size); | |
448 | if (n < 0) { | |
449 | log_error("Failed to read core data: %s", strerror(-n)); | |
450 | return (int) n; | |
451 | } | |
452 | if ((size_t) n < size) { | |
453 | log_error("Core data too short."); | |
454 | return -EIO; | |
455 | } | |
456 | ||
457 | *ret = field; | |
458 | *ret_size = size + 9; | |
459 | ||
460 | field = NULL; | |
461 | ||
462 | return 0; | |
463 | } | |
803a3464 | 464 | |
3f132692 JF |
465 | /* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines: |
466 | * 0:/dev/pts/23 | |
467 | * pos: 0 | |
468 | * flags: 0100002 | |
469 | * | |
470 | * 1:/dev/pts/23 | |
471 | * pos: 0 | |
472 | * flags: 0100002 | |
473 | * | |
474 | * 2:/dev/pts/23 | |
475 | * pos: 0 | |
476 | * flags: 0100002 | |
477 | * EOF | |
478 | */ | |
479 | static int compose_open_fds(pid_t pid, char **open_fds) { | |
480 | _cleanup_fclose_ FILE *stream = NULL; | |
481 | char path[PATH_MAX], line[LINE_MAX]; | |
482 | size_t ignored_size; | |
483 | const char *fddelim = ""; | |
484 | struct dirent *dent = NULL; | |
485 | _cleanup_closedir_ DIR *proc_fd_dir = NULL; | |
486 | int r = 0; | |
487 | ||
488 | assert(pid >= 0); | |
489 | assert(open_fds != NULL); | |
490 | ||
491 | sprintf(path, "/proc/"PID_FMT"/fd", pid); | |
492 | proc_fd_dir = opendir(path); | |
493 | ||
494 | if (proc_fd_dir == NULL) | |
495 | return -ENOENT; | |
496 | ||
497 | stream = open_memstream(open_fds, &ignored_size); | |
498 | if (!stream) | |
499 | return -ENOMEM; | |
500 | ||
501 | for (dent = readdir(proc_fd_dir); dent != NULL; dent = readdir(proc_fd_dir)) { | |
502 | _cleanup_free_ char *fdname = NULL; | |
503 | _cleanup_fclose_ FILE *fdinfo = NULL; | |
504 | ||
505 | if (dent->d_name[0] == '.' || strcmp(dent->d_name, "..") == 0) | |
506 | continue; | |
507 | ||
508 | /* Too long path is unlikely a path to valid file descriptor in /proc/[pid]/fd */ | |
509 | /* Skip it. */ | |
510 | r = snprintf(path, sizeof(path), "/proc/"PID_FMT"/fd/%s", pid, dent->d_name); | |
511 | if (r >= (int)sizeof(path)) | |
512 | continue; | |
513 | ||
514 | r = readlink_malloc(path, &fdname); | |
515 | if (r < 0) | |
516 | return r; | |
517 | ||
518 | fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname); | |
519 | fddelim = "\n"; | |
520 | ||
521 | /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */ | |
522 | ||
523 | /* Too long path is unlikely a path to valid file descriptor info in /proc/[pid]/fdinfo */ | |
524 | /* Skip it. */ | |
525 | r = snprintf(path, sizeof(path), "/proc/"PID_FMT"/fdinfo/%s", pid, dent->d_name); | |
526 | if (r >= (int)sizeof(path)) | |
527 | continue; | |
528 | ||
529 | fdinfo = fopen(path, "re"); | |
530 | if (fdinfo == NULL) | |
531 | continue; | |
532 | ||
533 | while(fgets(line, sizeof(line), fdinfo) != NULL) | |
534 | fprintf(stream, "%s%s", | |
535 | line, strchr(line, '\n') == NULL ? "\n" : ""); | |
536 | } | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
f5e04665 | 541 | int main(int argc, char* argv[]) { |
34c10968 LP |
542 | |
543 | _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
544 | *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL, | |
545 | *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL, | |
3f132692 JF |
546 | *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL, *core_open_fds = NULL, |
547 | *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL, *core_proc_cgroup = NULL, | |
548 | *core_cwd = NULL, *core_root = NULL, *core_environ = NULL, | |
9fe13294 | 549 | *exe = NULL, *comm = NULL, *filename = NULL; |
1eef15b1 | 550 | const char *info[_INFO_LEN]; |
34c10968 LP |
551 | |
552 | _cleanup_close_ int coredump_fd = -1; | |
553 | ||
3f132692 | 554 | struct iovec iovec[26]; |
34c10968 | 555 | off_t coredump_size; |
f5e04665 | 556 | int r, j = 0; |
a035f819 | 557 | uid_t uid, owner_uid; |
fee80f69 | 558 | gid_t gid; |
a035f819 | 559 | pid_t pid; |
34c10968 | 560 | char *t; |
3f132692 | 561 | const char *p; |
f5e04665 | 562 | |
34c10968 | 563 | /* Make sure we never enter a loop */ |
803a3464 | 564 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 | 565 | |
34c10968 LP |
566 | /* First, log to a safe place, since we don't know what |
567 | * crashed and it might be journald which we'd rather not log | |
568 | * to then. */ | |
569 | log_set_target(LOG_TARGET_KMSG); | |
34c10968 | 570 | log_open(); |
803a3464 | 571 | |
1eef15b1 ZJS |
572 | if (argc < INFO_COMM + 1) { |
573 | log_error("Not enough arguments passed from kernel (%d, expected %d).", | |
574 | argc - 1, INFO_COMM + 1 - 1); | |
f5e04665 LP |
575 | r = -EINVAL; |
576 | goto finish; | |
577 | } | |
578 | ||
34c10968 LP |
579 | /* Ignore all parse errors */ |
580 | parse_config(); | |
8c9571d0 LP |
581 | |
582 | log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); | |
583 | log_debug("Selected compression %s.", yes_no(arg_compress)); | |
34c10968 | 584 | |
1eef15b1 | 585 | r = parse_uid(argv[INFO_UID + 1], &uid); |
f5e04665 | 586 | if (r < 0) { |
34c10968 LP |
587 | log_error("Failed to parse UID."); |
588 | goto finish; | |
589 | } | |
803a3464 | 590 | |
1eef15b1 | 591 | r = parse_pid(argv[INFO_PID + 1], &pid); |
34c10968 | 592 | if (r < 0) { |
f5e04665 | 593 | log_error("Failed to parse PID."); |
f5e04665 LP |
594 | goto finish; |
595 | } | |
596 | ||
1eef15b1 | 597 | r = parse_gid(argv[INFO_GID + 1], &gid); |
34c10968 LP |
598 | if (r < 0) { |
599 | log_error("Failed to parse GID."); | |
600 | goto finish; | |
601 | } | |
602 | ||
1eef15b1 | 603 | if (get_process_comm(pid, &comm) < 0) { |
3f85ef0f | 604 | log_warning("Failed to get COMM, falling back to the command line."); |
1eef15b1 ZJS |
605 | comm = strv_join(argv + INFO_COMM + 1, " "); |
606 | } | |
607 | ||
608 | if (get_process_exe(pid, &exe) < 0) | |
609 | log_warning("Failed to get EXE."); | |
610 | ||
611 | info[INFO_PID] = argv[INFO_PID + 1]; | |
612 | info[INFO_UID] = argv[INFO_UID + 1]; | |
613 | info[INFO_GID] = argv[INFO_GID + 1]; | |
614 | info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; | |
615 | info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; | |
616 | info[INFO_COMM] = comm; | |
617 | info[INFO_EXE] = exe; | |
618 | ||
ba1261bc | 619 | if (cg_pid_get_unit(pid, &t) >= 0) { |
803a3464 LP |
620 | |
621 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
803a3464 | 622 | |
34c10968 LP |
623 | /* If we are journald, we cut things short, |
624 | * don't write to the journal, but still | |
625 | * create a coredump. */ | |
626 | ||
627 | if (arg_storage != COREDUMP_STORAGE_NONE) | |
628 | arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
629 | ||
9fe13294 | 630 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 LP |
631 | if (r < 0) |
632 | goto finish; | |
633 | ||
9fe13294 | 634 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
635 | if (r < 0) |
636 | goto finish; | |
637 | ||
9fe13294 | 638 | log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); |
803a3464 LP |
639 | goto finish; |
640 | } | |
641 | ||
642 | core_unit = strappend("COREDUMP_UNIT=", t); | |
b7f7c685 | 643 | } else if (cg_pid_get_user_unit(pid, &t) >= 0) |
f9045468 | 644 | core_unit = strappend("COREDUMP_USER_UNIT=", t); |
803a3464 | 645 | |
f9045468 MT |
646 | if (core_unit) |
647 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
648 | ||
34c10968 LP |
649 | /* OK, now we know it's not the journal, hence we can make use |
650 | * of it now. */ | |
803a3464 LP |
651 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
652 | log_open(); | |
653 | ||
1eef15b1 | 654 | core_pid = strappend("COREDUMP_PID=", info[INFO_PID]); |
f5e04665 LP |
655 | if (core_pid) |
656 | IOVEC_SET_STRING(iovec[j++], core_pid); | |
657 | ||
1eef15b1 | 658 | core_uid = strappend("COREDUMP_UID=", info[INFO_UID]); |
f5e04665 LP |
659 | if (core_uid) |
660 | IOVEC_SET_STRING(iovec[j++], core_uid); | |
661 | ||
1eef15b1 | 662 | core_gid = strappend("COREDUMP_GID=", info[INFO_GID]); |
f5e04665 LP |
663 | if (core_gid) |
664 | IOVEC_SET_STRING(iovec[j++], core_gid); | |
665 | ||
1eef15b1 | 666 | core_signal = strappend("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); |
f5e04665 LP |
667 | if (core_signal) |
668 | IOVEC_SET_STRING(iovec[j++], core_signal); | |
669 | ||
f5e04665 LP |
670 | if (sd_pid_get_session(pid, &t) >= 0) { |
671 | core_session = strappend("COREDUMP_SESSION=", t); | |
672 | free(t); | |
673 | ||
674 | if (core_session) | |
675 | IOVEC_SET_STRING(iovec[j++], core_session); | |
676 | } | |
677 | ||
a035f819 | 678 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
7de80bfe KZ |
679 | r = asprintf(&core_owner_uid, |
680 | "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); | |
681 | if (r > 0) | |
a035f819 LP |
682 | IOVEC_SET_STRING(iovec[j++], core_owner_uid); |
683 | } | |
684 | ||
685 | if (sd_pid_get_slice(pid, &t) >= 0) { | |
686 | core_slice = strappend("COREDUMP_SLICE=", t); | |
687 | free(t); | |
688 | ||
689 | if (core_slice) | |
690 | IOVEC_SET_STRING(iovec[j++], core_slice); | |
691 | } | |
692 | ||
1eef15b1 ZJS |
693 | if (comm) { |
694 | core_comm = strappend("COREDUMP_COMM=", comm); | |
695 | if (core_comm) | |
696 | IOVEC_SET_STRING(iovec[j++], core_comm); | |
697 | } | |
698 | ||
699 | if (exe) { | |
8d4e028f | 700 | core_exe = strappend("COREDUMP_EXE=", exe); |
f5e04665 LP |
701 | if (core_exe) |
702 | IOVEC_SET_STRING(iovec[j++], core_exe); | |
703 | } | |
704 | ||
9bdbc2e2 | 705 | if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
f5e04665 LP |
706 | core_cmdline = strappend("COREDUMP_CMDLINE=", t); |
707 | free(t); | |
708 | ||
709 | if (core_cmdline) | |
710 | IOVEC_SET_STRING(iovec[j++], core_cmdline); | |
711 | } | |
712 | ||
a035f819 LP |
713 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
714 | core_cgroup = strappend("COREDUMP_CGROUP=", t); | |
715 | free(t); | |
716 | ||
717 | if (core_cgroup) | |
718 | IOVEC_SET_STRING(iovec[j++], core_cgroup); | |
719 | } | |
720 | ||
3f132692 JF |
721 | if (compose_open_fds(pid, &t) >= 0) { |
722 | core_open_fds = strappend("COREDUMP_OPEN_FDS=", t); | |
723 | free(t); | |
724 | ||
725 | if (core_open_fds) | |
726 | IOVEC_SET_STRING(iovec[j++], core_open_fds); | |
727 | } | |
728 | ||
729 | p = procfs_file_alloca(pid, "status"); | |
730 | if (read_full_file(p, &t, NULL) >= 0) { | |
731 | core_proc_status = strappend("COREDUMP_PROC_STATUS=", t); | |
732 | free(t); | |
733 | ||
734 | if (core_proc_status) | |
735 | IOVEC_SET_STRING(iovec[j++], core_proc_status); | |
736 | } | |
737 | ||
738 | p = procfs_file_alloca(pid, "maps"); | |
739 | if (read_full_file(p, &t, NULL) >= 0) { | |
740 | core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t); | |
741 | free(t); | |
742 | ||
743 | if (core_proc_maps) | |
744 | IOVEC_SET_STRING(iovec[j++], core_proc_maps); | |
745 | } | |
746 | ||
747 | p = procfs_file_alloca(pid, "limits"); | |
748 | if (read_full_file(p, &t, NULL) >= 0) { | |
749 | core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t); | |
750 | free(t); | |
751 | ||
752 | if (core_proc_limits) | |
753 | IOVEC_SET_STRING(iovec[j++], core_proc_limits); | |
754 | } | |
755 | ||
756 | p = procfs_file_alloca(pid, "cgroup"); | |
757 | if (read_full_file(p, &t, NULL) >=0) { | |
758 | core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t); | |
759 | free(t); | |
760 | ||
761 | if (core_proc_cgroup) | |
762 | IOVEC_SET_STRING(iovec[j++], core_proc_cgroup); | |
763 | } | |
764 | ||
765 | if (get_process_cwd(pid, &t) >= 0) { | |
766 | core_cwd = strappend("COREDUMP_CWD=", t); | |
767 | free(t); | |
768 | ||
769 | if (core_cwd) | |
770 | IOVEC_SET_STRING(iovec[j++], core_cwd); | |
771 | } | |
772 | ||
773 | if (get_process_root(pid, &t) >= 0) { | |
774 | core_root = strappend("COREDUMP_ROOT=", t); | |
775 | free(t); | |
776 | ||
777 | if (core_root) | |
778 | IOVEC_SET_STRING(iovec[j++], core_root); | |
779 | } | |
780 | ||
781 | if (get_process_environ(pid, &t) >= 0) { | |
782 | core_environ = strappend("COREDUMP_ENVIRON=", t); | |
783 | free(t); | |
784 | ||
785 | if (core_environ) | |
786 | IOVEC_SET_STRING(iovec[j++], core_environ); | |
787 | } | |
788 | ||
1eef15b1 | 789 | core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); |
f5e04665 LP |
790 | if (core_timestamp) |
791 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
792 | ||
793 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
794 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
795 | ||
0dc5d23c LP |
796 | /* Vacuum before we write anything again */ |
797 | coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
798 | ||
34c10968 | 799 | /* Always stream the coredump to disk, if that's possible */ |
9fe13294 | 800 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 | 801 | if (r < 0) |
2424a475 ZJS |
802 | /* skip whole core dumping part */ |
803 | goto log; | |
34c10968 LP |
804 | |
805 | /* If we don't want to keep the coredump on disk, remove it | |
8d4e028f LP |
806 | * now, as later on we will lack the privileges for |
807 | * it. However, we keep the fd to it, so that we can still | |
808 | * process it and log it. */ | |
9fe13294 | 809 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
810 | if (r < 0) |
811 | goto finish; | |
9fe13294 ZJS |
812 | if (r == 0) { |
813 | const char *coredump_filename; | |
814 | ||
815 | coredump_filename = strappenda("COREDUMP_FILENAME=", filename); | |
816 | IOVEC_SET_STRING(iovec[j++], coredump_filename); | |
817 | } | |
34c10968 | 818 | |
0dc5d23c LP |
819 | /* Vacuum again, but exclude the coredump we just created */ |
820 | coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use); | |
821 | ||
fee80f69 LP |
822 | /* Now, let's drop privileges to become the user who owns the |
823 | * segfaulted process and allocate the coredump memory under | |
b26c631a KP |
824 | * the user's uid. This also ensures that the credentials |
825 | * journald will see are the ones of the coredumping user, | |
826 | * thus making sure the user gets access to the core dump. */ | |
fee80f69 LP |
827 | if (setresgid(gid, gid, gid) < 0 || |
828 | setresuid(uid, uid, uid) < 0) { | |
829 | log_error("Failed to drop privileges: %m"); | |
830 | r = -errno; | |
831 | goto finish; | |
832 | } | |
833 | ||
8d4e028f LP |
834 | #ifdef HAVE_ELFUTILS |
835 | /* Try to get a strack trace if we can */ | |
836 | if (coredump_size <= arg_process_size_max) { | |
837 | _cleanup_free_ char *stacktrace = NULL; | |
838 | ||
839 | r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); | |
840 | if (r >= 0) | |
1eef15b1 | 841 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); |
4d229b31 UTL |
842 | else if (r == -EINVAL) |
843 | log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno())); | |
8d4e028f LP |
844 | else |
845 | log_warning("Failed to generate stack trace: %s", strerror(-r)); | |
846 | } | |
847 | ||
848 | if (!core_message) | |
849 | #endif | |
2424a475 | 850 | log: |
1eef15b1 | 851 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); |
8d4e028f LP |
852 | if (core_message) |
853 | IOVEC_SET_STRING(iovec[j++], core_message); | |
854 | ||
34c10968 LP |
855 | /* Optionally store the entire coredump in the journal */ |
856 | if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && | |
857 | coredump_size <= (off_t) arg_journal_size_max) { | |
858 | size_t sz; | |
fee80f69 | 859 | |
34c10968 | 860 | /* Store the coredump itself in the journal */ |
fee80f69 | 861 | |
34c10968 LP |
862 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
863 | if (r >= 0) { | |
864 | iovec[j].iov_base = coredump_data; | |
865 | iovec[j].iov_len = sz; | |
866 | j++; | |
ca0ceb6f | 867 | } |
fee80f69 LP |
868 | } |
869 | ||
f5e04665 LP |
870 | r = sd_journal_sendv(iovec, j); |
871 | if (r < 0) | |
872c8faa | 872 | log_error("Failed to log coredump: %s", strerror(-r)); |
f5e04665 LP |
873 | |
874 | finish: | |
f5e04665 LP |
875 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
876 | } |