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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); | |
34727273 ZJS |
101 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, |
102 | CoredumpStorage, | |
103 | "Failed to parse storage setting"); | |
104 | ||
105 | typedef enum CoredumpCompression { | |
106 | COREDUMP_COMPRESSION_NONE, | |
107 | COREDUMP_COMPRESSION_XZ, | |
108 | _COREDUMP_COMPRESSION_MAX, | |
109 | _COREDUMP_COMPRESSION_INVALID = -1 | |
110 | } CoredumpCompression; | |
111 | ||
112 | static const char* const coredump_compression_table[_COREDUMP_COMPRESSION_MAX] = { | |
113 | [COREDUMP_COMPRESSION_NONE] = "none", | |
114 | [COREDUMP_COMPRESSION_XZ] = "xz", | |
115 | }; | |
116 | ||
117 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_compression, CoredumpCompression); | |
118 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_compression, coredump_compression, | |
119 | CoredumpCompression, | |
120 | "Failed to parse compression setting"); | |
121 | ||
122 | static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
123 | static CoredumpCompression arg_compression = COREDUMP_COMPRESSION_XZ; | |
34727273 ZJS |
124 | static off_t arg_process_size_max = PROCESS_SIZE_MAX; |
125 | static off_t arg_external_size_max = EXTERNAL_SIZE_MAX; | |
126 | static size_t arg_journal_size_max = JOURNAL_SIZE_MAX; | |
0dc5d23c LP |
127 | static off_t arg_keep_free = (off_t) -1; |
128 | static off_t arg_max_use = (off_t) -1; | |
34c10968 LP |
129 | |
130 | static int parse_config(void) { | |
34c10968 | 131 | static const ConfigTableItem items[] = { |
34727273 ZJS |
132 | { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, |
133 | { "Coredump", "Compression", config_parse_coredump_compression, 0, &arg_compression }, | |
34727273 ZJS |
134 | { "Coredump", "ProcessSizeMax", config_parse_iec_off, 0, &arg_process_size_max }, |
135 | { "Coredump", "ExternalSizeMax", config_parse_iec_off, 0, &arg_external_size_max }, | |
136 | { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, | |
0dc5d23c LP |
137 | { "Coredump", "KeepFree", config_parse_iec_off, 0, &arg_keep_free }, |
138 | { "Coredump", "MaxUse", config_parse_iec_off, 0, &arg_max_use }, | |
34c10968 LP |
139 | {} |
140 | }; | |
141 | ||
cf677ac1 | 142 | return config_parse( |
34c10968 LP |
143 | NULL, |
144 | "/etc/systemd/coredump.conf", | |
145 | NULL, | |
146 | "Coredump\0", | |
147 | config_item_table_lookup, | |
148 | (void*) items, | |
149 | false, | |
150 | false, | |
151 | NULL); | |
152 | } | |
153 | ||
154 | static int fix_acl(int fd, uid_t uid) { | |
155 | ||
156 | #ifdef HAVE_ACL | |
157 | _cleanup_(acl_freep) acl_t acl = NULL; | |
158 | acl_entry_t entry; | |
159 | acl_permset_t permset; | |
160 | ||
161 | if (uid <= SYSTEM_UID_MAX) | |
162 | return 0; | |
163 | ||
164 | /* Make sure normal users can read (but not write or delete) | |
165 | * their own coredumps */ | |
166 | ||
167 | acl = acl_get_fd(fd); | |
168 | if (!acl) { | |
169 | log_error("Failed to get ACL: %m"); | |
170 | return -errno; | |
171 | } | |
172 | ||
173 | if (acl_create_entry(&acl, &entry) < 0 || | |
174 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
175 | acl_set_qualifier(entry, &uid) < 0) { | |
176 | log_error("Failed to patch ACL: %m"); | |
177 | return -errno; | |
178 | } | |
179 | ||
180 | if (acl_get_permset(entry, &permset) < 0 || | |
181 | acl_add_perm(permset, ACL_READ) < 0 || | |
182 | calc_acl_mask_if_needed(&acl) < 0) { | |
183 | log_warning("Failed to patch ACL: %m"); | |
184 | return -errno; | |
185 | } | |
186 | ||
187 | if (acl_set_fd(fd, acl) < 0) { | |
188 | log_error("Failed to apply ACL: %m"); | |
189 | return -errno; | |
190 | } | |
191 | #endif | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
1eef15b1 | 196 | static int fix_xattr(int fd, const char *info[_INFO_LEN]) { |
0cd77f97 | 197 | |
1eef15b1 ZJS |
198 | static const char * const xattrs[_INFO_LEN] = { |
199 | [INFO_PID] = "user.coredump.pid", | |
200 | [INFO_UID] = "user.coredump.uid", | |
201 | [INFO_GID] = "user.coredump.gid", | |
202 | [INFO_SIGNAL] = "user.coredump.signal", | |
203 | [INFO_TIMESTAMP] = "user.coredump.timestamp", | |
204 | [INFO_COMM] = "user.coredump.comm", | |
205 | [INFO_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
206 | }; |
207 | ||
34c10968 | 208 | int r = 0; |
0cd77f97 | 209 | unsigned i; |
34c10968 | 210 | |
1eef15b1 | 211 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
212 | * attributes. Just because we can. */ |
213 | ||
1eef15b1 ZJS |
214 | for (i = 0; i < _INFO_LEN; i++) { |
215 | int k; | |
216 | ||
217 | if (isempty(info[i]) || !xattrs[i]) | |
0cd77f97 | 218 | continue; |
34c10968 | 219 | |
1eef15b1 ZJS |
220 | k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); |
221 | if (k < 0 && r == 0) | |
34c10968 | 222 | r = -errno; |
0cd77f97 | 223 | } |
34c10968 LP |
224 | |
225 | return r; | |
226 | } | |
227 | ||
b0b21dce | 228 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 229 | |
cfd652ed ZJS |
230 | static int fix_permissions(int fd, const char *filename, const char *target, |
231 | const char *info[_INFO_LEN], uid_t uid) { | |
232 | ||
233 | /* Ignore errors on these */ | |
234 | fchmod(fd, 0640); | |
235 | fix_acl(fd, uid); | |
236 | fix_xattr(fd, info); | |
237 | ||
238 | if (fsync(fd) < 0) { | |
239 | log_error("Failed to sync coredump %s: %m", filename); | |
240 | return -errno; | |
241 | } | |
242 | ||
243 | if (rename(filename, target) < 0) { | |
244 | log_error("Failed to rename coredump %s -> %s: %m", filename, target); | |
245 | return -errno; | |
246 | } | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static int maybe_remove_external_coredump(const char *filename, off_t size) { | |
252 | ||
253 | /* Returns 1 if might remove, 0 if will not remove, <0 on error. */ | |
254 | ||
255 | if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && | |
256 | size <= arg_external_size_max) | |
257 | return 0; | |
258 | ||
259 | if (!filename) | |
260 | return 1; | |
261 | ||
9d951bf4 | 262 | if (unlink(filename) < 0 && errno != ENOENT) { |
cfd652ed ZJS |
263 | log_error("Failed to unlink %s: %m", filename); |
264 | return -errno; | |
265 | } | |
266 | ||
267 | return 1; | |
268 | } | |
269 | ||
0dc5d23c LP |
270 | static int save_external_coredump( |
271 | const char *info[_INFO_LEN], | |
272 | uid_t uid, | |
273 | char **ret_filename, | |
274 | int *ret_fd, | |
275 | off_t *ret_size) { | |
cfd652ed | 276 | |
0dc5d23c | 277 | _cleanup_free_ char *p = NULL, *t = NULL, *c = NULL, *fn = NULL, *tmp = NULL, *u = NULL; |
34c10968 LP |
278 | _cleanup_close_ int fd = -1; |
279 | sd_id128_t boot; | |
280 | struct stat st; | |
281 | int r; | |
282 | ||
1eef15b1 | 283 | assert(info); |
34c10968 LP |
284 | assert(ret_filename); |
285 | assert(ret_fd); | |
286 | assert(ret_size); | |
287 | ||
1eef15b1 | 288 | c = filename_escape(info[INFO_COMM]); |
34c10968 LP |
289 | if (!c) |
290 | return log_oom(); | |
291 | ||
1eef15b1 | 292 | p = filename_escape(info[INFO_PID]); |
34c10968 LP |
293 | if (!p) |
294 | return log_oom(); | |
295 | ||
0dc5d23c LP |
296 | u = filename_escape(info[INFO_UID]); |
297 | if (!u) | |
298 | return log_oom(); | |
299 | ||
1eef15b1 | 300 | t = filename_escape(info[INFO_TIMESTAMP]); |
34c10968 LP |
301 | if (!t) |
302 | return log_oom(); | |
303 | ||
304 | r = sd_id128_get_boot(&boot); | |
305 | if (r < 0) { | |
306 | log_error("Failed to determine boot ID: %s", strerror(-r)); | |
307 | return r; | |
308 | } | |
309 | ||
310 | r = asprintf(&fn, | |
0dc5d23c | 311 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
34c10968 | 312 | c, |
0dc5d23c | 313 | u, |
34c10968 LP |
314 | SD_ID128_FORMAT_VAL(boot), |
315 | p, | |
316 | t); | |
317 | if (r < 0) | |
318 | return log_oom(); | |
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 LP |
332 | r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max); |
333 | if (r == -E2BIG) { | |
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); | |
351 | goto uncompressed; | |
352 | } | |
353 | ||
cfd652ed ZJS |
354 | #ifdef HAVE_XZ |
355 | /* If we will remove the coredump anyway, do not compress. */ | |
34727273 ZJS |
356 | if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
357 | && arg_compression == COREDUMP_COMPRESSION_XZ) { | |
cfd652ed ZJS |
358 | |
359 | _cleanup_free_ char *fn2 = NULL; | |
360 | char *tmp2; | |
361 | _cleanup_close_ int fd2 = -1; | |
362 | ||
363 | tmp2 = strappenda(tmp, ".xz"); | |
364 | fd2 = open(tmp2, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); | |
365 | if (fd2 < 0) { | |
366 | log_error("Failed to create file %s: %m", tmp2); | |
367 | goto uncompressed; | |
368 | } | |
369 | ||
cf677ac1 | 370 | r = compress_stream(fd, fd2, LZMA_PRESET_DEFAULT, -1); |
cfd652ed ZJS |
371 | if (r < 0) { |
372 | log_error("Failed to compress %s: %s", tmp2, strerror(-r)); | |
373 | unlink_noerrno(tmp2); | |
374 | goto fail2; | |
375 | } | |
376 | ||
377 | fn2 = strappend(fn, ".xz"); | |
378 | if (!fn2) { | |
379 | log_oom(); | |
380 | goto fail2; | |
381 | } | |
382 | ||
383 | r = fix_permissions(fd2, tmp2, fn2, info, uid); | |
384 | if (r < 0) | |
385 | goto fail2; | |
386 | ||
387 | *ret_filename = fn2; /* compressed */ | |
388 | *ret_fd = fd; /* uncompressed */ | |
389 | *ret_size = st.st_size; /* uncompressed */ | |
390 | ||
391 | fn2 = NULL; | |
392 | fd = -1; | |
393 | ||
394 | return 0; | |
395 | ||
396 | fail2: | |
397 | unlink_noerrno(tmp2); | |
34c10968 | 398 | } |
cfd652ed ZJS |
399 | #endif |
400 | ||
401 | uncompressed: | |
402 | r = fix_permissions(fd, tmp, fn, info, uid); | |
403 | if (r < 0) | |
404 | goto fail; | |
34c10968 LP |
405 | |
406 | *ret_filename = fn; | |
407 | *ret_fd = fd; | |
408 | *ret_size = st.st_size; | |
409 | ||
410 | fn = NULL; | |
411 | fd = -1; | |
412 | ||
413 | return 0; | |
414 | ||
415 | fail: | |
416 | unlink_noerrno(tmp); | |
417 | return r; | |
418 | } | |
419 | ||
420 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
421 | _cleanup_free_ char *field = NULL; | |
422 | ssize_t n; | |
423 | ||
8d4e028f | 424 | assert(fd >= 0); |
34c10968 LP |
425 | assert(ret); |
426 | assert(ret_size); | |
427 | ||
428 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { | |
429 | log_warning("Failed to seek: %m"); | |
430 | return -errno; | |
803a3464 LP |
431 | } |
432 | ||
34c10968 LP |
433 | field = malloc(9 + size); |
434 | if (!field) { | |
cfd652ed | 435 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
436 | return -ENOMEM; |
437 | } | |
438 | ||
439 | memcpy(field, "COREDUMP=", 9); | |
440 | ||
441 | n = read(fd, field + 9, size); | |
442 | if (n < 0) { | |
443 | log_error("Failed to read core data: %s", strerror(-n)); | |
444 | return (int) n; | |
445 | } | |
446 | if ((size_t) n < size) { | |
447 | log_error("Core data too short."); | |
448 | return -EIO; | |
449 | } | |
450 | ||
451 | *ret = field; | |
452 | *ret_size = size + 9; | |
453 | ||
454 | field = NULL; | |
455 | ||
456 | return 0; | |
457 | } | |
803a3464 | 458 | |
f5e04665 | 459 | int main(int argc, char* argv[]) { |
34c10968 LP |
460 | |
461 | _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
462 | *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL, | |
463 | *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL, | |
9fe13294 ZJS |
464 | *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL, |
465 | *exe = NULL, *comm = NULL, *filename = NULL; | |
1eef15b1 | 466 | const char *info[_INFO_LEN]; |
34c10968 LP |
467 | |
468 | _cleanup_close_ int coredump_fd = -1; | |
469 | ||
9fe13294 | 470 | struct iovec iovec[18]; |
34c10968 | 471 | off_t coredump_size; |
f5e04665 | 472 | int r, j = 0; |
a035f819 | 473 | uid_t uid, owner_uid; |
fee80f69 | 474 | gid_t gid; |
a035f819 | 475 | pid_t pid; |
34c10968 | 476 | char *t; |
f5e04665 | 477 | |
34c10968 | 478 | /* Make sure we never enter a loop */ |
803a3464 | 479 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 | 480 | |
34c10968 LP |
481 | /* First, log to a safe place, since we don't know what |
482 | * crashed and it might be journald which we'd rather not log | |
483 | * to then. */ | |
484 | log_set_target(LOG_TARGET_KMSG); | |
34c10968 | 485 | log_open(); |
803a3464 | 486 | |
1eef15b1 ZJS |
487 | if (argc < INFO_COMM + 1) { |
488 | log_error("Not enough arguments passed from kernel (%d, expected %d).", | |
489 | argc - 1, INFO_COMM + 1 - 1); | |
f5e04665 LP |
490 | r = -EINVAL; |
491 | goto finish; | |
492 | } | |
493 | ||
34c10968 LP |
494 | /* Ignore all parse errors */ |
495 | parse_config(); | |
34727273 ZJS |
496 | log_debug("Selected storage '%s'.", |
497 | coredump_storage_to_string(arg_storage)); | |
cf677ac1 LP |
498 | log_debug("Selected compression %s.", |
499 | coredump_compression_to_string(arg_compression)); | |
34c10968 | 500 | |
1eef15b1 | 501 | r = parse_uid(argv[INFO_UID + 1], &uid); |
f5e04665 | 502 | if (r < 0) { |
34c10968 LP |
503 | log_error("Failed to parse UID."); |
504 | goto finish; | |
505 | } | |
803a3464 | 506 | |
1eef15b1 | 507 | r = parse_pid(argv[INFO_PID + 1], &pid); |
34c10968 | 508 | if (r < 0) { |
f5e04665 | 509 | log_error("Failed to parse PID."); |
f5e04665 LP |
510 | goto finish; |
511 | } | |
512 | ||
1eef15b1 | 513 | r = parse_gid(argv[INFO_GID + 1], &gid); |
34c10968 LP |
514 | if (r < 0) { |
515 | log_error("Failed to parse GID."); | |
516 | goto finish; | |
517 | } | |
518 | ||
1eef15b1 ZJS |
519 | if (get_process_comm(pid, &comm) < 0) { |
520 | log_warning("Failed to get COMM, falling back to the commandline."); | |
521 | comm = strv_join(argv + INFO_COMM + 1, " "); | |
522 | } | |
523 | ||
524 | if (get_process_exe(pid, &exe) < 0) | |
525 | log_warning("Failed to get EXE."); | |
526 | ||
527 | info[INFO_PID] = argv[INFO_PID + 1]; | |
528 | info[INFO_UID] = argv[INFO_UID + 1]; | |
529 | info[INFO_GID] = argv[INFO_GID + 1]; | |
530 | info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; | |
531 | info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; | |
532 | info[INFO_COMM] = comm; | |
533 | info[INFO_EXE] = exe; | |
534 | ||
ba1261bc | 535 | if (cg_pid_get_unit(pid, &t) >= 0) { |
803a3464 LP |
536 | |
537 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
803a3464 | 538 | |
34c10968 LP |
539 | /* If we are journald, we cut things short, |
540 | * don't write to the journal, but still | |
541 | * create a coredump. */ | |
542 | ||
543 | if (arg_storage != COREDUMP_STORAGE_NONE) | |
544 | arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
545 | ||
9fe13294 | 546 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 LP |
547 | if (r < 0) |
548 | goto finish; | |
549 | ||
9fe13294 | 550 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
551 | if (r < 0) |
552 | goto finish; | |
553 | ||
9fe13294 | 554 | log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); |
803a3464 LP |
555 | goto finish; |
556 | } | |
557 | ||
558 | core_unit = strappend("COREDUMP_UNIT=", t); | |
b7f7c685 | 559 | } else if (cg_pid_get_user_unit(pid, &t) >= 0) |
f9045468 | 560 | core_unit = strappend("COREDUMP_USER_UNIT=", t); |
803a3464 | 561 | |
f9045468 MT |
562 | if (core_unit) |
563 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
564 | ||
34c10968 LP |
565 | /* OK, now we know it's not the journal, hence we can make use |
566 | * of it now. */ | |
803a3464 LP |
567 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
568 | log_open(); | |
569 | ||
1eef15b1 | 570 | core_pid = strappend("COREDUMP_PID=", info[INFO_PID]); |
f5e04665 LP |
571 | if (core_pid) |
572 | IOVEC_SET_STRING(iovec[j++], core_pid); | |
573 | ||
1eef15b1 | 574 | core_uid = strappend("COREDUMP_UID=", info[INFO_UID]); |
f5e04665 LP |
575 | if (core_uid) |
576 | IOVEC_SET_STRING(iovec[j++], core_uid); | |
577 | ||
1eef15b1 | 578 | core_gid = strappend("COREDUMP_GID=", info[INFO_GID]); |
f5e04665 LP |
579 | if (core_gid) |
580 | IOVEC_SET_STRING(iovec[j++], core_gid); | |
581 | ||
1eef15b1 | 582 | core_signal = strappend("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); |
f5e04665 LP |
583 | if (core_signal) |
584 | IOVEC_SET_STRING(iovec[j++], core_signal); | |
585 | ||
f5e04665 LP |
586 | if (sd_pid_get_session(pid, &t) >= 0) { |
587 | core_session = strappend("COREDUMP_SESSION=", t); | |
588 | free(t); | |
589 | ||
590 | if (core_session) | |
591 | IOVEC_SET_STRING(iovec[j++], core_session); | |
592 | } | |
593 | ||
a035f819 LP |
594 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
595 | asprintf(&core_owner_uid, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); | |
596 | ||
597 | if (core_owner_uid) | |
598 | IOVEC_SET_STRING(iovec[j++], core_owner_uid); | |
599 | } | |
600 | ||
601 | if (sd_pid_get_slice(pid, &t) >= 0) { | |
602 | core_slice = strappend("COREDUMP_SLICE=", t); | |
603 | free(t); | |
604 | ||
605 | if (core_slice) | |
606 | IOVEC_SET_STRING(iovec[j++], core_slice); | |
607 | } | |
608 | ||
1eef15b1 ZJS |
609 | if (comm) { |
610 | core_comm = strappend("COREDUMP_COMM=", comm); | |
611 | if (core_comm) | |
612 | IOVEC_SET_STRING(iovec[j++], core_comm); | |
613 | } | |
614 | ||
615 | if (exe) { | |
8d4e028f | 616 | core_exe = strappend("COREDUMP_EXE=", exe); |
f5e04665 LP |
617 | if (core_exe) |
618 | IOVEC_SET_STRING(iovec[j++], core_exe); | |
619 | } | |
620 | ||
9bdbc2e2 | 621 | if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
f5e04665 LP |
622 | core_cmdline = strappend("COREDUMP_CMDLINE=", t); |
623 | free(t); | |
624 | ||
625 | if (core_cmdline) | |
626 | IOVEC_SET_STRING(iovec[j++], core_cmdline); | |
627 | } | |
628 | ||
a035f819 LP |
629 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
630 | core_cgroup = strappend("COREDUMP_CGROUP=", t); | |
631 | free(t); | |
632 | ||
633 | if (core_cgroup) | |
634 | IOVEC_SET_STRING(iovec[j++], core_cgroup); | |
635 | } | |
636 | ||
1eef15b1 | 637 | core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); |
f5e04665 LP |
638 | if (core_timestamp) |
639 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
640 | ||
641 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
642 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
643 | ||
0dc5d23c LP |
644 | /* Vacuum before we write anything again */ |
645 | coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
646 | ||
34c10968 | 647 | /* Always stream the coredump to disk, if that's possible */ |
9fe13294 | 648 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 | 649 | if (r < 0) |
2424a475 ZJS |
650 | /* skip whole core dumping part */ |
651 | goto log; | |
34c10968 LP |
652 | |
653 | /* If we don't want to keep the coredump on disk, remove it | |
8d4e028f LP |
654 | * now, as later on we will lack the privileges for |
655 | * it. However, we keep the fd to it, so that we can still | |
656 | * process it and log it. */ | |
9fe13294 | 657 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
658 | if (r < 0) |
659 | goto finish; | |
9fe13294 ZJS |
660 | if (r == 0) { |
661 | const char *coredump_filename; | |
662 | ||
663 | coredump_filename = strappenda("COREDUMP_FILENAME=", filename); | |
664 | IOVEC_SET_STRING(iovec[j++], coredump_filename); | |
665 | } | |
34c10968 | 666 | |
0dc5d23c LP |
667 | /* Vacuum again, but exclude the coredump we just created */ |
668 | coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use); | |
669 | ||
fee80f69 LP |
670 | /* Now, let's drop privileges to become the user who owns the |
671 | * segfaulted process and allocate the coredump memory under | |
672 | * his uid. This also ensures that the credentials journald | |
673 | * will see are the ones of the coredumping user, thus making | |
674 | * sure the user himself gets access to the core dump. */ | |
fee80f69 LP |
675 | if (setresgid(gid, gid, gid) < 0 || |
676 | setresuid(uid, uid, uid) < 0) { | |
677 | log_error("Failed to drop privileges: %m"); | |
678 | r = -errno; | |
679 | goto finish; | |
680 | } | |
681 | ||
8d4e028f LP |
682 | #ifdef HAVE_ELFUTILS |
683 | /* Try to get a strack trace if we can */ | |
684 | if (coredump_size <= arg_process_size_max) { | |
685 | _cleanup_free_ char *stacktrace = NULL; | |
686 | ||
687 | r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); | |
688 | if (r >= 0) | |
1eef15b1 | 689 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); |
8d4e028f LP |
690 | else |
691 | log_warning("Failed to generate stack trace: %s", strerror(-r)); | |
692 | } | |
693 | ||
694 | if (!core_message) | |
695 | #endif | |
2424a475 | 696 | log: |
1eef15b1 | 697 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); |
8d4e028f LP |
698 | if (core_message) |
699 | IOVEC_SET_STRING(iovec[j++], core_message); | |
700 | ||
34c10968 LP |
701 | /* Optionally store the entire coredump in the journal */ |
702 | if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && | |
703 | coredump_size <= (off_t) arg_journal_size_max) { | |
704 | size_t sz; | |
fee80f69 | 705 | |
34c10968 | 706 | /* Store the coredump itself in the journal */ |
fee80f69 | 707 | |
34c10968 LP |
708 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
709 | if (r >= 0) { | |
710 | iovec[j].iov_base = coredump_data; | |
711 | iovec[j].iov_len = sz; | |
712 | j++; | |
ca0ceb6f | 713 | } |
fee80f69 LP |
714 | } |
715 | ||
f5e04665 LP |
716 | r = sd_journal_sendv(iovec, j); |
717 | if (r < 0) | |
872c8faa | 718 | log_error("Failed to log coredump: %s", strerror(-r)); |
f5e04665 LP |
719 | |
720 | finish: | |
f5e04665 LP |
721 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
722 | } |