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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 LP |
28 | |
29 | #include <systemd/sd-journal.h> | |
30 | #include <systemd/sd-login.h> | |
31 | ||
32 | #include "log.h" | |
33 | #include "util.h" | |
1eef15b1 | 34 | #include "strv.h" |
b7f7c685 | 35 | #include "macro.h" |
49e942b2 | 36 | #include "mkdir.h" |
803a3464 | 37 | #include "special.h" |
ba1261bc | 38 | #include "cgroup-util.h" |
d18d46ec | 39 | #include "journald-native.h" |
34c10968 LP |
40 | #include "conf-parser.h" |
41 | #include "copy.h" | |
8d4e028f | 42 | #include "stacktrace.h" |
6388c315 | 43 | #include "path-util.h" |
cfd652ed | 44 | #include "compress.h" |
0dc5d23c | 45 | #include "coredump-vacuum.h" |
34c10968 LP |
46 | |
47 | #ifdef HAVE_ACL | |
34727273 ZJS |
48 | # include <sys/acl.h> |
49 | # include "acl-util.h" | |
50 | #endif | |
51 | ||
52 | #ifdef HAVE_XZ | |
53 | # include <lzma.h> | |
54 | #else | |
55 | # define LZMA_PRESET_DEFAULT 0 | |
34c10968 LP |
56 | #endif |
57 | ||
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 LP |
69 | /* Make sure to not make this larger than the maximum journal entry |
70 | * size. See ENTRY_SIZE_MAX in journald-native.c. */ | |
34c10968 | 71 | assert_cc(JOURNAL_SIZE_MAX <= ENTRY_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 | ||
cf677ac1 | 123 | return config_parse( |
34c10968 LP |
124 | NULL, |
125 | "/etc/systemd/coredump.conf", | |
126 | NULL, | |
127 | "Coredump\0", | |
128 | config_item_table_lookup, | |
129 | (void*) items, | |
130 | false, | |
131 | false, | |
132 | NULL); | |
133 | } | |
134 | ||
135 | static int fix_acl(int fd, uid_t uid) { | |
136 | ||
137 | #ifdef HAVE_ACL | |
138 | _cleanup_(acl_freep) acl_t acl = NULL; | |
139 | acl_entry_t entry; | |
140 | acl_permset_t permset; | |
141 | ||
b59233e6 LP |
142 | assert(fd >= 0); |
143 | ||
34c10968 LP |
144 | if (uid <= SYSTEM_UID_MAX) |
145 | return 0; | |
146 | ||
147 | /* Make sure normal users can read (but not write or delete) | |
148 | * their own coredumps */ | |
149 | ||
150 | acl = acl_get_fd(fd); | |
151 | if (!acl) { | |
152 | log_error("Failed to get ACL: %m"); | |
153 | return -errno; | |
154 | } | |
155 | ||
156 | if (acl_create_entry(&acl, &entry) < 0 || | |
157 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
158 | acl_set_qualifier(entry, &uid) < 0) { | |
159 | log_error("Failed to patch ACL: %m"); | |
160 | return -errno; | |
161 | } | |
162 | ||
163 | if (acl_get_permset(entry, &permset) < 0 || | |
164 | acl_add_perm(permset, ACL_READ) < 0 || | |
165 | calc_acl_mask_if_needed(&acl) < 0) { | |
166 | log_warning("Failed to patch ACL: %m"); | |
167 | return -errno; | |
168 | } | |
169 | ||
170 | if (acl_set_fd(fd, acl) < 0) { | |
171 | log_error("Failed to apply ACL: %m"); | |
172 | return -errno; | |
173 | } | |
174 | #endif | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
1eef15b1 | 179 | static int fix_xattr(int fd, const char *info[_INFO_LEN]) { |
0cd77f97 | 180 | |
1eef15b1 ZJS |
181 | static const char * const xattrs[_INFO_LEN] = { |
182 | [INFO_PID] = "user.coredump.pid", | |
183 | [INFO_UID] = "user.coredump.uid", | |
184 | [INFO_GID] = "user.coredump.gid", | |
185 | [INFO_SIGNAL] = "user.coredump.signal", | |
186 | [INFO_TIMESTAMP] = "user.coredump.timestamp", | |
187 | [INFO_COMM] = "user.coredump.comm", | |
188 | [INFO_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
189 | }; |
190 | ||
34c10968 | 191 | int r = 0; |
0cd77f97 | 192 | unsigned i; |
34c10968 | 193 | |
b59233e6 LP |
194 | assert(fd >= 0); |
195 | ||
1eef15b1 | 196 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
197 | * attributes. Just because we can. */ |
198 | ||
1eef15b1 ZJS |
199 | for (i = 0; i < _INFO_LEN; i++) { |
200 | int k; | |
201 | ||
202 | if (isempty(info[i]) || !xattrs[i]) | |
0cd77f97 | 203 | continue; |
34c10968 | 204 | |
1eef15b1 ZJS |
205 | k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); |
206 | if (k < 0 && r == 0) | |
34c10968 | 207 | r = -errno; |
0cd77f97 | 208 | } |
34c10968 LP |
209 | |
210 | return r; | |
211 | } | |
212 | ||
b0b21dce | 213 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 214 | |
b59233e6 LP |
215 | static int fix_permissions( |
216 | int fd, | |
217 | const char *filename, | |
218 | const char *target, | |
219 | const char *info[_INFO_LEN], | |
220 | uid_t uid) { | |
221 | ||
222 | assert(fd >= 0); | |
223 | assert(filename); | |
224 | assert(target); | |
225 | assert(info); | |
cfd652ed ZJS |
226 | |
227 | /* Ignore errors on these */ | |
228 | fchmod(fd, 0640); | |
229 | fix_acl(fd, uid); | |
230 | fix_xattr(fd, info); | |
231 | ||
232 | if (fsync(fd) < 0) { | |
233 | log_error("Failed to sync coredump %s: %m", filename); | |
234 | return -errno; | |
235 | } | |
236 | ||
237 | if (rename(filename, target) < 0) { | |
238 | log_error("Failed to rename coredump %s -> %s: %m", filename, target); | |
239 | return -errno; | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static int maybe_remove_external_coredump(const char *filename, off_t size) { | |
246 | ||
b59233e6 | 247 | /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
cfd652ed ZJS |
248 | |
249 | if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && | |
250 | size <= arg_external_size_max) | |
251 | return 0; | |
252 | ||
253 | if (!filename) | |
254 | return 1; | |
255 | ||
9d951bf4 | 256 | if (unlink(filename) < 0 && errno != ENOENT) { |
cfd652ed ZJS |
257 | log_error("Failed to unlink %s: %m", filename); |
258 | return -errno; | |
259 | } | |
260 | ||
261 | return 1; | |
262 | } | |
263 | ||
b59233e6 LP |
264 | static int make_filename(const char *info[_INFO_LEN], char **ret) { |
265 | _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; | |
34c10968 | 266 | sd_id128_t boot; |
34c10968 LP |
267 | int r; |
268 | ||
1eef15b1 | 269 | assert(info); |
34c10968 | 270 | |
1eef15b1 | 271 | c = filename_escape(info[INFO_COMM]); |
34c10968 | 272 | if (!c) |
b59233e6 | 273 | return -ENOMEM; |
34c10968 | 274 | |
0dc5d23c LP |
275 | u = filename_escape(info[INFO_UID]); |
276 | if (!u) | |
b59233e6 | 277 | return -ENOMEM; |
34c10968 LP |
278 | |
279 | r = sd_id128_get_boot(&boot); | |
b59233e6 | 280 | if (r < 0) |
34c10968 | 281 | return r; |
34c10968 | 282 | |
b59233e6 LP |
283 | p = filename_escape(info[INFO_PID]); |
284 | if (!p) | |
285 | return -ENOMEM; | |
286 | ||
287 | t = filename_escape(info[INFO_TIMESTAMP]); | |
288 | if (!t) | |
289 | return -ENOMEM; | |
290 | ||
291 | if (asprintf(ret, | |
0dc5d23c | 292 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
34c10968 | 293 | c, |
0dc5d23c | 294 | u, |
34c10968 LP |
295 | SD_ID128_FORMAT_VAL(boot), |
296 | p, | |
b59233e6 LP |
297 | t) < 0) |
298 | return -ENOMEM; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static int save_external_coredump( | |
304 | const char *info[_INFO_LEN], | |
305 | uid_t uid, | |
306 | char **ret_filename, | |
307 | int *ret_fd, | |
308 | off_t *ret_size) { | |
309 | ||
310 | _cleanup_free_ char *fn = NULL, *tmp = NULL; | |
311 | _cleanup_close_ int fd = -1; | |
312 | struct stat st; | |
313 | int r; | |
314 | ||
315 | assert(info); | |
316 | assert(ret_filename); | |
317 | assert(ret_fd); | |
318 | assert(ret_size); | |
319 | ||
320 | r = make_filename(info, &fn); | |
321 | if (r < 0) { | |
322 | log_error("Failed to determine coredump file name: %s", strerror(-r)); | |
323 | return r; | |
324 | } | |
34c10968 LP |
325 | |
326 | tmp = tempfn_random(fn); | |
327 | if (!tmp) | |
328 | return log_oom(); | |
803a3464 | 329 | |
d2e54fae | 330 | mkdir_p_label("/var/lib/systemd/coredump", 0755); |
803a3464 | 331 | |
34c10968 LP |
332 | fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
333 | if (fd < 0) { | |
cfd652ed | 334 | log_error("Failed to create coredump file %s: %m", tmp); |
803a3464 LP |
335 | return -errno; |
336 | } | |
337 | ||
93240d3a LP |
338 | r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max); |
339 | if (r == -E2BIG) { | |
0dc5d23c | 340 | log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
341 | goto fail; |
342 | } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { | |
0dc5d23c | 343 | log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
344 | goto fail; |
345 | } else if (r < 0) { | |
34c10968 LP |
346 | log_error("Failed to dump coredump to file: %s", strerror(-r)); |
347 | goto fail; | |
348 | } | |
803a3464 | 349 | |
34c10968 | 350 | if (fstat(fd, &st) < 0) { |
1eef15b1 | 351 | log_error("Failed to fstat coredump %s: %m", tmp); |
34c10968 LP |
352 | goto fail; |
353 | } | |
354 | ||
7849c2ac TA |
355 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
356 | log_error("Failed to seek on %s: %m", tmp); | |
b59233e6 | 357 | goto fail; |
7849c2ac TA |
358 | } |
359 | ||
cfd652ed ZJS |
360 | #ifdef HAVE_XZ |
361 | /* If we will remove the coredump anyway, do not compress. */ | |
34727273 | 362 | if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
8c9571d0 | 363 | && arg_compress) { |
cfd652ed | 364 | |
b59233e6 LP |
365 | _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
366 | _cleanup_close_ int fd_compressed = -1; | |
cfd652ed | 367 | |
b59233e6 LP |
368 | fn_compressed = strappend(fn, ".xz"); |
369 | if (!fn_compressed) { | |
370 | r = log_oom(); | |
cfd652ed ZJS |
371 | goto uncompressed; |
372 | } | |
373 | ||
b59233e6 LP |
374 | tmp_compressed = tempfn_random(fn_compressed); |
375 | if (!tmp_compressed) { | |
376 | r = log_oom(); | |
377 | goto uncompressed; | |
cfd652ed ZJS |
378 | } |
379 | ||
b59233e6 LP |
380 | fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
381 | if (fd_compressed < 0) { | |
382 | log_error("Failed to create file %s: %m", tmp_compressed); | |
383 | goto uncompressed; | |
cfd652ed ZJS |
384 | } |
385 | ||
b59233e6 LP |
386 | r = compress_stream(fd, fd_compressed, LZMA_PRESET_DEFAULT, -1); |
387 | if (r < 0) { | |
388 | log_error("Failed to compress %s: %s", tmp_compressed, strerror(-r)); | |
389 | goto fail_compressed; | |
390 | } | |
391 | ||
392 | r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid); | |
cfd652ed | 393 | if (r < 0) |
b59233e6 LP |
394 | goto fail_compressed; |
395 | ||
396 | /* OK, this worked, we can get rid of the uncompressed version now */ | |
397 | unlink_noerrno(tmp); | |
cfd652ed | 398 | |
b59233e6 LP |
399 | *ret_filename = fn_compressed; /* compressed */ |
400 | *ret_fd = fd; /* uncompressed */ | |
401 | *ret_size = st.st_size; /* uncompressed */ | |
cfd652ed | 402 | |
b59233e6 | 403 | fn_compressed = NULL; |
cfd652ed ZJS |
404 | fd = -1; |
405 | ||
406 | return 0; | |
407 | ||
b59233e6 LP |
408 | fail_compressed: |
409 | unlink_noerrno(tmp_compressed); | |
34c10968 | 410 | } |
cfd652ed ZJS |
411 | #endif |
412 | ||
413 | uncompressed: | |
414 | r = fix_permissions(fd, tmp, fn, info, uid); | |
415 | if (r < 0) | |
416 | goto fail; | |
34c10968 LP |
417 | |
418 | *ret_filename = fn; | |
419 | *ret_fd = fd; | |
420 | *ret_size = st.st_size; | |
421 | ||
422 | fn = NULL; | |
423 | fd = -1; | |
424 | ||
425 | return 0; | |
426 | ||
427 | fail: | |
428 | unlink_noerrno(tmp); | |
429 | return r; | |
430 | } | |
431 | ||
432 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
433 | _cleanup_free_ char *field = NULL; | |
434 | ssize_t n; | |
435 | ||
8d4e028f | 436 | assert(fd >= 0); |
34c10968 LP |
437 | assert(ret); |
438 | assert(ret_size); | |
439 | ||
440 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { | |
441 | log_warning("Failed to seek: %m"); | |
442 | return -errno; | |
803a3464 LP |
443 | } |
444 | ||
34c10968 LP |
445 | field = malloc(9 + size); |
446 | if (!field) { | |
cfd652ed | 447 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
448 | return -ENOMEM; |
449 | } | |
450 | ||
451 | memcpy(field, "COREDUMP=", 9); | |
452 | ||
453 | n = read(fd, field + 9, size); | |
454 | if (n < 0) { | |
455 | log_error("Failed to read core data: %s", strerror(-n)); | |
456 | return (int) n; | |
457 | } | |
458 | if ((size_t) n < size) { | |
459 | log_error("Core data too short."); | |
460 | return -EIO; | |
461 | } | |
462 | ||
463 | *ret = field; | |
464 | *ret_size = size + 9; | |
465 | ||
466 | field = NULL; | |
467 | ||
468 | return 0; | |
469 | } | |
803a3464 | 470 | |
f5e04665 | 471 | int main(int argc, char* argv[]) { |
34c10968 LP |
472 | |
473 | _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
474 | *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL, | |
475 | *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL, | |
9fe13294 ZJS |
476 | *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL, |
477 | *exe = NULL, *comm = NULL, *filename = NULL; | |
1eef15b1 | 478 | const char *info[_INFO_LEN]; |
34c10968 LP |
479 | |
480 | _cleanup_close_ int coredump_fd = -1; | |
481 | ||
9fe13294 | 482 | struct iovec iovec[18]; |
34c10968 | 483 | off_t coredump_size; |
f5e04665 | 484 | int r, j = 0; |
a035f819 | 485 | uid_t uid, owner_uid; |
fee80f69 | 486 | gid_t gid; |
a035f819 | 487 | pid_t pid; |
34c10968 | 488 | char *t; |
f5e04665 | 489 | |
34c10968 | 490 | /* Make sure we never enter a loop */ |
803a3464 | 491 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 | 492 | |
34c10968 LP |
493 | /* First, log to a safe place, since we don't know what |
494 | * crashed and it might be journald which we'd rather not log | |
495 | * to then. */ | |
496 | log_set_target(LOG_TARGET_KMSG); | |
34c10968 | 497 | log_open(); |
803a3464 | 498 | |
1eef15b1 ZJS |
499 | if (argc < INFO_COMM + 1) { |
500 | log_error("Not enough arguments passed from kernel (%d, expected %d).", | |
501 | argc - 1, INFO_COMM + 1 - 1); | |
f5e04665 LP |
502 | r = -EINVAL; |
503 | goto finish; | |
504 | } | |
505 | ||
34c10968 LP |
506 | /* Ignore all parse errors */ |
507 | parse_config(); | |
8c9571d0 LP |
508 | |
509 | log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); | |
510 | log_debug("Selected compression %s.", yes_no(arg_compress)); | |
34c10968 | 511 | |
1eef15b1 | 512 | r = parse_uid(argv[INFO_UID + 1], &uid); |
f5e04665 | 513 | if (r < 0) { |
34c10968 LP |
514 | log_error("Failed to parse UID."); |
515 | goto finish; | |
516 | } | |
803a3464 | 517 | |
1eef15b1 | 518 | r = parse_pid(argv[INFO_PID + 1], &pid); |
34c10968 | 519 | if (r < 0) { |
f5e04665 | 520 | log_error("Failed to parse PID."); |
f5e04665 LP |
521 | goto finish; |
522 | } | |
523 | ||
1eef15b1 | 524 | r = parse_gid(argv[INFO_GID + 1], &gid); |
34c10968 LP |
525 | if (r < 0) { |
526 | log_error("Failed to parse GID."); | |
527 | goto finish; | |
528 | } | |
529 | ||
1eef15b1 ZJS |
530 | if (get_process_comm(pid, &comm) < 0) { |
531 | log_warning("Failed to get COMM, falling back to the commandline."); | |
532 | comm = strv_join(argv + INFO_COMM + 1, " "); | |
533 | } | |
534 | ||
535 | if (get_process_exe(pid, &exe) < 0) | |
536 | log_warning("Failed to get EXE."); | |
537 | ||
538 | info[INFO_PID] = argv[INFO_PID + 1]; | |
539 | info[INFO_UID] = argv[INFO_UID + 1]; | |
540 | info[INFO_GID] = argv[INFO_GID + 1]; | |
541 | info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; | |
542 | info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; | |
543 | info[INFO_COMM] = comm; | |
544 | info[INFO_EXE] = exe; | |
545 | ||
ba1261bc | 546 | if (cg_pid_get_unit(pid, &t) >= 0) { |
803a3464 LP |
547 | |
548 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
803a3464 | 549 | |
34c10968 LP |
550 | /* If we are journald, we cut things short, |
551 | * don't write to the journal, but still | |
552 | * create a coredump. */ | |
553 | ||
554 | if (arg_storage != COREDUMP_STORAGE_NONE) | |
555 | arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
556 | ||
9fe13294 | 557 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 LP |
558 | if (r < 0) |
559 | goto finish; | |
560 | ||
9fe13294 | 561 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
562 | if (r < 0) |
563 | goto finish; | |
564 | ||
9fe13294 | 565 | log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); |
803a3464 LP |
566 | goto finish; |
567 | } | |
568 | ||
569 | core_unit = strappend("COREDUMP_UNIT=", t); | |
b7f7c685 | 570 | } else if (cg_pid_get_user_unit(pid, &t) >= 0) |
f9045468 | 571 | core_unit = strappend("COREDUMP_USER_UNIT=", t); |
803a3464 | 572 | |
f9045468 MT |
573 | if (core_unit) |
574 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
575 | ||
34c10968 LP |
576 | /* OK, now we know it's not the journal, hence we can make use |
577 | * of it now. */ | |
803a3464 LP |
578 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
579 | log_open(); | |
580 | ||
1eef15b1 | 581 | core_pid = strappend("COREDUMP_PID=", info[INFO_PID]); |
f5e04665 LP |
582 | if (core_pid) |
583 | IOVEC_SET_STRING(iovec[j++], core_pid); | |
584 | ||
1eef15b1 | 585 | core_uid = strappend("COREDUMP_UID=", info[INFO_UID]); |
f5e04665 LP |
586 | if (core_uid) |
587 | IOVEC_SET_STRING(iovec[j++], core_uid); | |
588 | ||
1eef15b1 | 589 | core_gid = strappend("COREDUMP_GID=", info[INFO_GID]); |
f5e04665 LP |
590 | if (core_gid) |
591 | IOVEC_SET_STRING(iovec[j++], core_gid); | |
592 | ||
1eef15b1 | 593 | core_signal = strappend("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); |
f5e04665 LP |
594 | if (core_signal) |
595 | IOVEC_SET_STRING(iovec[j++], core_signal); | |
596 | ||
f5e04665 LP |
597 | if (sd_pid_get_session(pid, &t) >= 0) { |
598 | core_session = strappend("COREDUMP_SESSION=", t); | |
599 | free(t); | |
600 | ||
601 | if (core_session) | |
602 | IOVEC_SET_STRING(iovec[j++], core_session); | |
603 | } | |
604 | ||
a035f819 LP |
605 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
606 | asprintf(&core_owner_uid, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); | |
607 | ||
608 | if (core_owner_uid) | |
609 | IOVEC_SET_STRING(iovec[j++], core_owner_uid); | |
610 | } | |
611 | ||
612 | if (sd_pid_get_slice(pid, &t) >= 0) { | |
613 | core_slice = strappend("COREDUMP_SLICE=", t); | |
614 | free(t); | |
615 | ||
616 | if (core_slice) | |
617 | IOVEC_SET_STRING(iovec[j++], core_slice); | |
618 | } | |
619 | ||
1eef15b1 ZJS |
620 | if (comm) { |
621 | core_comm = strappend("COREDUMP_COMM=", comm); | |
622 | if (core_comm) | |
623 | IOVEC_SET_STRING(iovec[j++], core_comm); | |
624 | } | |
625 | ||
626 | if (exe) { | |
8d4e028f | 627 | core_exe = strappend("COREDUMP_EXE=", exe); |
f5e04665 LP |
628 | if (core_exe) |
629 | IOVEC_SET_STRING(iovec[j++], core_exe); | |
630 | } | |
631 | ||
9bdbc2e2 | 632 | if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
f5e04665 LP |
633 | core_cmdline = strappend("COREDUMP_CMDLINE=", t); |
634 | free(t); | |
635 | ||
636 | if (core_cmdline) | |
637 | IOVEC_SET_STRING(iovec[j++], core_cmdline); | |
638 | } | |
639 | ||
a035f819 LP |
640 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
641 | core_cgroup = strappend("COREDUMP_CGROUP=", t); | |
642 | free(t); | |
643 | ||
644 | if (core_cgroup) | |
645 | IOVEC_SET_STRING(iovec[j++], core_cgroup); | |
646 | } | |
647 | ||
1eef15b1 | 648 | core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); |
f5e04665 LP |
649 | if (core_timestamp) |
650 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
651 | ||
652 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
653 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
654 | ||
0dc5d23c LP |
655 | /* Vacuum before we write anything again */ |
656 | coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
657 | ||
34c10968 | 658 | /* Always stream the coredump to disk, if that's possible */ |
9fe13294 | 659 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 | 660 | if (r < 0) |
2424a475 ZJS |
661 | /* skip whole core dumping part */ |
662 | goto log; | |
34c10968 LP |
663 | |
664 | /* If we don't want to keep the coredump on disk, remove it | |
8d4e028f LP |
665 | * now, as later on we will lack the privileges for |
666 | * it. However, we keep the fd to it, so that we can still | |
667 | * process it and log it. */ | |
9fe13294 | 668 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
669 | if (r < 0) |
670 | goto finish; | |
9fe13294 ZJS |
671 | if (r == 0) { |
672 | const char *coredump_filename; | |
673 | ||
674 | coredump_filename = strappenda("COREDUMP_FILENAME=", filename); | |
675 | IOVEC_SET_STRING(iovec[j++], coredump_filename); | |
676 | } | |
34c10968 | 677 | |
0dc5d23c LP |
678 | /* Vacuum again, but exclude the coredump we just created */ |
679 | coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use); | |
680 | ||
fee80f69 LP |
681 | /* Now, let's drop privileges to become the user who owns the |
682 | * segfaulted process and allocate the coredump memory under | |
683 | * his uid. This also ensures that the credentials journald | |
684 | * will see are the ones of the coredumping user, thus making | |
685 | * sure the user himself gets access to the core dump. */ | |
fee80f69 LP |
686 | if (setresgid(gid, gid, gid) < 0 || |
687 | setresuid(uid, uid, uid) < 0) { | |
688 | log_error("Failed to drop privileges: %m"); | |
689 | r = -errno; | |
690 | goto finish; | |
691 | } | |
692 | ||
8d4e028f LP |
693 | #ifdef HAVE_ELFUTILS |
694 | /* Try to get a strack trace if we can */ | |
695 | if (coredump_size <= arg_process_size_max) { | |
696 | _cleanup_free_ char *stacktrace = NULL; | |
697 | ||
698 | r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); | |
699 | if (r >= 0) | |
1eef15b1 | 700 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); |
8d4e028f LP |
701 | else |
702 | log_warning("Failed to generate stack trace: %s", strerror(-r)); | |
703 | } | |
704 | ||
705 | if (!core_message) | |
706 | #endif | |
2424a475 | 707 | log: |
1eef15b1 | 708 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); |
8d4e028f LP |
709 | if (core_message) |
710 | IOVEC_SET_STRING(iovec[j++], core_message); | |
711 | ||
34c10968 LP |
712 | /* Optionally store the entire coredump in the journal */ |
713 | if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && | |
714 | coredump_size <= (off_t) arg_journal_size_max) { | |
715 | size_t sz; | |
fee80f69 | 716 | |
34c10968 | 717 | /* Store the coredump itself in the journal */ |
fee80f69 | 718 | |
34c10968 LP |
719 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
720 | if (r >= 0) { | |
721 | iovec[j].iov_base = coredump_data; | |
722 | iovec[j].iov_len = sz; | |
723 | j++; | |
ca0ceb6f | 724 | } |
fee80f69 LP |
725 | } |
726 | ||
f5e04665 LP |
727 | r = sd_journal_sendv(iovec, j); |
728 | if (r < 0) | |
872c8faa | 729 | log_error("Failed to log coredump: %s", strerror(-r)); |
f5e04665 LP |
730 | |
731 | finish: | |
f5e04665 LP |
732 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
733 | } |