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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" | |
1eef15b1 | 39 | #include "strv.h" |
b7f7c685 | 40 | #include "macro.h" |
49e942b2 | 41 | #include "mkdir.h" |
803a3464 | 42 | #include "special.h" |
ba1261bc | 43 | #include "cgroup-util.h" |
d18d46ec | 44 | #include "journald-native.h" |
34c10968 LP |
45 | #include "conf-parser.h" |
46 | #include "copy.h" | |
8d4e028f | 47 | #include "stacktrace.h" |
6388c315 | 48 | #include "path-util.h" |
cfd652ed | 49 | #include "compress.h" |
0dc5d23c | 50 | #include "coredump-vacuum.h" |
34c10968 LP |
51 | |
52 | #ifdef HAVE_ACL | |
34727273 ZJS |
53 | # include <sys/acl.h> |
54 | # include "acl-util.h" | |
55 | #endif | |
56 | ||
34c10968 LP |
57 | /* The maximum size up to which we process coredumps */ |
58 | #define PROCESS_SIZE_MAX ((off_t) (2LLU*1024LLU*1024LLU*1024LLU)) | |
59 | ||
60 | /* The maximum size up to which we leave the coredump around on | |
61 | * disk */ | |
62 | #define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX | |
63 | ||
64 | /* The maximum size up to which we store the coredump in the | |
65 | * journal */ | |
66 | #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) | |
f5e04665 | 67 | |
c4aa09b0 | 68 | /* Make sure to not make this larger than the maximum journal entry |
874bc134 ZJS |
69 | * size. See DATA_SIZE_MAX in journald-native.c. */ |
70 | assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); | |
f5e04665 LP |
71 | |
72 | enum { | |
1eef15b1 ZJS |
73 | INFO_PID, |
74 | INFO_UID, | |
75 | INFO_GID, | |
76 | INFO_SIGNAL, | |
77 | INFO_TIMESTAMP, | |
78 | INFO_COMM, | |
79 | INFO_EXE, | |
80 | _INFO_LEN | |
f5e04665 LP |
81 | }; |
82 | ||
34c10968 LP |
83 | typedef enum CoredumpStorage { |
84 | COREDUMP_STORAGE_NONE, | |
85 | COREDUMP_STORAGE_EXTERNAL, | |
86 | COREDUMP_STORAGE_JOURNAL, | |
87 | COREDUMP_STORAGE_BOTH, | |
88 | _COREDUMP_STORAGE_MAX, | |
89 | _COREDUMP_STORAGE_INVALID = -1 | |
90 | } CoredumpStorage; | |
91 | ||
34c10968 LP |
92 | static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = { |
93 | [COREDUMP_STORAGE_NONE] = "none", | |
94 | [COREDUMP_STORAGE_EXTERNAL] = "external", | |
95 | [COREDUMP_STORAGE_JOURNAL] = "journal", | |
96 | [COREDUMP_STORAGE_BOTH] = "both", | |
97 | }; | |
98 | ||
99 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage); | |
8c9571d0 | 100 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting"); |
34727273 ZJS |
101 | |
102 | static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
8c9571d0 | 103 | static bool arg_compress = true; |
34727273 ZJS |
104 | static off_t arg_process_size_max = PROCESS_SIZE_MAX; |
105 | static off_t arg_external_size_max = EXTERNAL_SIZE_MAX; | |
106 | static size_t arg_journal_size_max = JOURNAL_SIZE_MAX; | |
0dc5d23c LP |
107 | static off_t arg_keep_free = (off_t) -1; |
108 | static off_t arg_max_use = (off_t) -1; | |
34c10968 LP |
109 | |
110 | static int parse_config(void) { | |
34c10968 | 111 | static const ConfigTableItem items[] = { |
8c9571d0 LP |
112 | { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, |
113 | { "Coredump", "Compress", config_parse_bool, 0, &arg_compress }, | |
114 | { "Coredump", "ProcessSizeMax", config_parse_iec_off, 0, &arg_process_size_max }, | |
115 | { "Coredump", "ExternalSizeMax", config_parse_iec_off, 0, &arg_external_size_max }, | |
116 | { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, | |
117 | { "Coredump", "KeepFree", config_parse_iec_off, 0, &arg_keep_free }, | |
118 | { "Coredump", "MaxUse", config_parse_iec_off, 0, &arg_max_use }, | |
34c10968 LP |
119 | {} |
120 | }; | |
121 | ||
36f822c4 ZJS |
122 | return config_parse(NULL, "/etc/systemd/coredump.conf", NULL, |
123 | "Coredump\0", | |
124 | config_item_table_lookup, items, | |
125 | false, false, true, NULL); | |
34c10968 LP |
126 | } |
127 | ||
128 | static int fix_acl(int fd, uid_t uid) { | |
129 | ||
130 | #ifdef HAVE_ACL | |
131 | _cleanup_(acl_freep) acl_t acl = NULL; | |
132 | acl_entry_t entry; | |
133 | acl_permset_t permset; | |
134 | ||
b59233e6 LP |
135 | assert(fd >= 0); |
136 | ||
34c10968 LP |
137 | if (uid <= SYSTEM_UID_MAX) |
138 | return 0; | |
139 | ||
140 | /* Make sure normal users can read (but not write or delete) | |
141 | * their own coredumps */ | |
142 | ||
143 | acl = acl_get_fd(fd); | |
144 | if (!acl) { | |
145 | log_error("Failed to get ACL: %m"); | |
146 | return -errno; | |
147 | } | |
148 | ||
149 | if (acl_create_entry(&acl, &entry) < 0 || | |
150 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
151 | acl_set_qualifier(entry, &uid) < 0) { | |
152 | log_error("Failed to patch ACL: %m"); | |
153 | return -errno; | |
154 | } | |
155 | ||
156 | if (acl_get_permset(entry, &permset) < 0 || | |
157 | acl_add_perm(permset, ACL_READ) < 0 || | |
158 | calc_acl_mask_if_needed(&acl) < 0) { | |
159 | log_warning("Failed to patch ACL: %m"); | |
160 | return -errno; | |
161 | } | |
162 | ||
163 | if (acl_set_fd(fd, acl) < 0) { | |
164 | log_error("Failed to apply ACL: %m"); | |
165 | return -errno; | |
166 | } | |
167 | #endif | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
1eef15b1 | 172 | static int fix_xattr(int fd, const char *info[_INFO_LEN]) { |
0cd77f97 | 173 | |
1eef15b1 ZJS |
174 | static const char * const xattrs[_INFO_LEN] = { |
175 | [INFO_PID] = "user.coredump.pid", | |
176 | [INFO_UID] = "user.coredump.uid", | |
177 | [INFO_GID] = "user.coredump.gid", | |
178 | [INFO_SIGNAL] = "user.coredump.signal", | |
179 | [INFO_TIMESTAMP] = "user.coredump.timestamp", | |
180 | [INFO_COMM] = "user.coredump.comm", | |
181 | [INFO_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
182 | }; |
183 | ||
34c10968 | 184 | int r = 0; |
0cd77f97 | 185 | unsigned i; |
34c10968 | 186 | |
b59233e6 LP |
187 | assert(fd >= 0); |
188 | ||
1eef15b1 | 189 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
190 | * attributes. Just because we can. */ |
191 | ||
1eef15b1 ZJS |
192 | for (i = 0; i < _INFO_LEN; i++) { |
193 | int k; | |
194 | ||
195 | if (isempty(info[i]) || !xattrs[i]) | |
0cd77f97 | 196 | continue; |
34c10968 | 197 | |
1eef15b1 ZJS |
198 | k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); |
199 | if (k < 0 && r == 0) | |
34c10968 | 200 | r = -errno; |
0cd77f97 | 201 | } |
34c10968 LP |
202 | |
203 | return r; | |
204 | } | |
205 | ||
b0b21dce | 206 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 207 | |
b59233e6 LP |
208 | static int fix_permissions( |
209 | int fd, | |
210 | const char *filename, | |
211 | const char *target, | |
212 | const char *info[_INFO_LEN], | |
213 | uid_t uid) { | |
214 | ||
215 | assert(fd >= 0); | |
216 | assert(filename); | |
217 | assert(target); | |
218 | assert(info); | |
cfd652ed ZJS |
219 | |
220 | /* Ignore errors on these */ | |
221 | fchmod(fd, 0640); | |
222 | fix_acl(fd, uid); | |
223 | fix_xattr(fd, info); | |
224 | ||
225 | if (fsync(fd) < 0) { | |
226 | log_error("Failed to sync coredump %s: %m", filename); | |
227 | return -errno; | |
228 | } | |
229 | ||
230 | if (rename(filename, target) < 0) { | |
231 | log_error("Failed to rename coredump %s -> %s: %m", filename, target); | |
232 | return -errno; | |
233 | } | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static int maybe_remove_external_coredump(const char *filename, off_t size) { | |
239 | ||
b59233e6 | 240 | /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
cfd652ed ZJS |
241 | |
242 | if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && | |
243 | size <= arg_external_size_max) | |
244 | return 0; | |
245 | ||
246 | if (!filename) | |
247 | return 1; | |
248 | ||
9d951bf4 | 249 | if (unlink(filename) < 0 && errno != ENOENT) { |
cfd652ed ZJS |
250 | log_error("Failed to unlink %s: %m", filename); |
251 | return -errno; | |
252 | } | |
253 | ||
254 | return 1; | |
255 | } | |
256 | ||
b59233e6 LP |
257 | static int make_filename(const char *info[_INFO_LEN], char **ret) { |
258 | _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; | |
34c10968 | 259 | sd_id128_t boot; |
34c10968 LP |
260 | int r; |
261 | ||
1eef15b1 | 262 | assert(info); |
34c10968 | 263 | |
1eef15b1 | 264 | c = filename_escape(info[INFO_COMM]); |
34c10968 | 265 | if (!c) |
b59233e6 | 266 | return -ENOMEM; |
34c10968 | 267 | |
0dc5d23c LP |
268 | u = filename_escape(info[INFO_UID]); |
269 | if (!u) | |
b59233e6 | 270 | return -ENOMEM; |
34c10968 LP |
271 | |
272 | r = sd_id128_get_boot(&boot); | |
b59233e6 | 273 | if (r < 0) |
34c10968 | 274 | return r; |
34c10968 | 275 | |
b59233e6 LP |
276 | p = filename_escape(info[INFO_PID]); |
277 | if (!p) | |
278 | return -ENOMEM; | |
279 | ||
280 | t = filename_escape(info[INFO_TIMESTAMP]); | |
281 | if (!t) | |
282 | return -ENOMEM; | |
283 | ||
284 | if (asprintf(ret, | |
0dc5d23c | 285 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
34c10968 | 286 | c, |
0dc5d23c | 287 | u, |
34c10968 LP |
288 | SD_ID128_FORMAT_VAL(boot), |
289 | p, | |
b59233e6 LP |
290 | t) < 0) |
291 | return -ENOMEM; | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static int save_external_coredump( | |
297 | const char *info[_INFO_LEN], | |
298 | uid_t uid, | |
299 | char **ret_filename, | |
300 | int *ret_fd, | |
301 | off_t *ret_size) { | |
302 | ||
303 | _cleanup_free_ char *fn = NULL, *tmp = NULL; | |
304 | _cleanup_close_ int fd = -1; | |
305 | struct stat st; | |
306 | int r; | |
307 | ||
308 | assert(info); | |
309 | assert(ret_filename); | |
310 | assert(ret_fd); | |
311 | assert(ret_size); | |
312 | ||
313 | r = make_filename(info, &fn); | |
314 | if (r < 0) { | |
315 | log_error("Failed to determine coredump file name: %s", strerror(-r)); | |
316 | return r; | |
317 | } | |
34c10968 LP |
318 | |
319 | tmp = tempfn_random(fn); | |
320 | if (!tmp) | |
321 | return log_oom(); | |
803a3464 | 322 | |
d2e54fae | 323 | mkdir_p_label("/var/lib/systemd/coredump", 0755); |
803a3464 | 324 | |
34c10968 LP |
325 | fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
326 | if (fd < 0) { | |
cfd652ed | 327 | log_error("Failed to create coredump file %s: %m", tmp); |
803a3464 LP |
328 | return -errno; |
329 | } | |
330 | ||
93240d3a LP |
331 | r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max); |
332 | if (r == -E2BIG) { | |
0dc5d23c | 333 | log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
334 | goto fail; |
335 | } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { | |
0dc5d23c | 336 | log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
337 | goto fail; |
338 | } else if (r < 0) { | |
34c10968 LP |
339 | log_error("Failed to dump coredump to file: %s", strerror(-r)); |
340 | goto fail; | |
341 | } | |
803a3464 | 342 | |
34c10968 | 343 | if (fstat(fd, &st) < 0) { |
1eef15b1 | 344 | log_error("Failed to fstat coredump %s: %m", tmp); |
34c10968 LP |
345 | goto fail; |
346 | } | |
347 | ||
7849c2ac TA |
348 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
349 | log_error("Failed to seek on %s: %m", tmp); | |
b59233e6 | 350 | goto fail; |
7849c2ac TA |
351 | } |
352 | ||
d89c8fdf | 353 | #if defined(HAVE_XZ) || defined(HAVE_LZ4) |
cfd652ed | 354 | /* If we will remove the coredump anyway, do not compress. */ |
34727273 | 355 | if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
8c9571d0 | 356 | && arg_compress) { |
cfd652ed | 357 | |
b59233e6 LP |
358 | _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
359 | _cleanup_close_ int fd_compressed = -1; | |
cfd652ed | 360 | |
d89c8fdf | 361 | fn_compressed = strappend(fn, COMPRESSED_EXT); |
b59233e6 | 362 | if (!fn_compressed) { |
d89c8fdf | 363 | log_oom(); |
cfd652ed ZJS |
364 | goto uncompressed; |
365 | } | |
366 | ||
b59233e6 LP |
367 | tmp_compressed = tempfn_random(fn_compressed); |
368 | if (!tmp_compressed) { | |
d89c8fdf | 369 | log_oom(); |
b59233e6 | 370 | goto uncompressed; |
cfd652ed ZJS |
371 | } |
372 | ||
b59233e6 LP |
373 | fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
374 | if (fd_compressed < 0) { | |
375 | log_error("Failed to create file %s: %m", tmp_compressed); | |
376 | goto uncompressed; | |
cfd652ed ZJS |
377 | } |
378 | ||
d89c8fdf | 379 | r = compress_stream(fd, fd_compressed, -1); |
b59233e6 LP |
380 | if (r < 0) { |
381 | log_error("Failed to compress %s: %s", tmp_compressed, strerror(-r)); | |
382 | goto fail_compressed; | |
383 | } | |
384 | ||
385 | r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid); | |
cfd652ed | 386 | if (r < 0) |
b59233e6 LP |
387 | goto fail_compressed; |
388 | ||
389 | /* OK, this worked, we can get rid of the uncompressed version now */ | |
390 | unlink_noerrno(tmp); | |
cfd652ed | 391 | |
b59233e6 LP |
392 | *ret_filename = fn_compressed; /* compressed */ |
393 | *ret_fd = fd; /* uncompressed */ | |
394 | *ret_size = st.st_size; /* uncompressed */ | |
cfd652ed | 395 | |
b59233e6 | 396 | fn_compressed = NULL; |
cfd652ed ZJS |
397 | fd = -1; |
398 | ||
399 | return 0; | |
400 | ||
b59233e6 LP |
401 | fail_compressed: |
402 | unlink_noerrno(tmp_compressed); | |
34c10968 | 403 | } |
cfd652ed ZJS |
404 | |
405 | uncompressed: | |
3b1a55e1 | 406 | #endif |
cfd652ed ZJS |
407 | r = fix_permissions(fd, tmp, fn, info, uid); |
408 | if (r < 0) | |
409 | goto fail; | |
34c10968 LP |
410 | |
411 | *ret_filename = fn; | |
412 | *ret_fd = fd; | |
413 | *ret_size = st.st_size; | |
414 | ||
415 | fn = NULL; | |
416 | fd = -1; | |
417 | ||
418 | return 0; | |
419 | ||
420 | fail: | |
421 | unlink_noerrno(tmp); | |
422 | return r; | |
423 | } | |
424 | ||
425 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
426 | _cleanup_free_ char *field = NULL; | |
427 | ssize_t n; | |
428 | ||
8d4e028f | 429 | assert(fd >= 0); |
34c10968 LP |
430 | assert(ret); |
431 | assert(ret_size); | |
432 | ||
433 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { | |
434 | log_warning("Failed to seek: %m"); | |
435 | return -errno; | |
803a3464 LP |
436 | } |
437 | ||
34c10968 LP |
438 | field = malloc(9 + size); |
439 | if (!field) { | |
cfd652ed | 440 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
441 | return -ENOMEM; |
442 | } | |
443 | ||
444 | memcpy(field, "COREDUMP=", 9); | |
445 | ||
446 | n = read(fd, field + 9, size); | |
447 | if (n < 0) { | |
448 | log_error("Failed to read core data: %s", strerror(-n)); | |
449 | return (int) n; | |
450 | } | |
451 | if ((size_t) n < size) { | |
452 | log_error("Core data too short."); | |
453 | return -EIO; | |
454 | } | |
455 | ||
456 | *ret = field; | |
457 | *ret_size = size + 9; | |
458 | ||
459 | field = NULL; | |
460 | ||
461 | return 0; | |
462 | } | |
803a3464 | 463 | |
f5e04665 | 464 | int main(int argc, char* argv[]) { |
34c10968 LP |
465 | |
466 | _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
467 | *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL, | |
468 | *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL, | |
9fe13294 ZJS |
469 | *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL, |
470 | *exe = NULL, *comm = NULL, *filename = NULL; | |
1eef15b1 | 471 | const char *info[_INFO_LEN]; |
34c10968 LP |
472 | |
473 | _cleanup_close_ int coredump_fd = -1; | |
474 | ||
9fe13294 | 475 | struct iovec iovec[18]; |
34c10968 | 476 | off_t coredump_size; |
f5e04665 | 477 | int r, j = 0; |
a035f819 | 478 | uid_t uid, owner_uid; |
fee80f69 | 479 | gid_t gid; |
a035f819 | 480 | pid_t pid; |
34c10968 | 481 | char *t; |
f5e04665 | 482 | |
34c10968 | 483 | /* Make sure we never enter a loop */ |
803a3464 | 484 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 | 485 | |
34c10968 LP |
486 | /* First, log to a safe place, since we don't know what |
487 | * crashed and it might be journald which we'd rather not log | |
488 | * to then. */ | |
489 | log_set_target(LOG_TARGET_KMSG); | |
34c10968 | 490 | log_open(); |
803a3464 | 491 | |
1eef15b1 ZJS |
492 | if (argc < INFO_COMM + 1) { |
493 | log_error("Not enough arguments passed from kernel (%d, expected %d).", | |
494 | argc - 1, INFO_COMM + 1 - 1); | |
f5e04665 LP |
495 | r = -EINVAL; |
496 | goto finish; | |
497 | } | |
498 | ||
34c10968 LP |
499 | /* Ignore all parse errors */ |
500 | parse_config(); | |
8c9571d0 LP |
501 | |
502 | log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); | |
503 | log_debug("Selected compression %s.", yes_no(arg_compress)); | |
34c10968 | 504 | |
1eef15b1 | 505 | r = parse_uid(argv[INFO_UID + 1], &uid); |
f5e04665 | 506 | if (r < 0) { |
34c10968 LP |
507 | log_error("Failed to parse UID."); |
508 | goto finish; | |
509 | } | |
803a3464 | 510 | |
1eef15b1 | 511 | r = parse_pid(argv[INFO_PID + 1], &pid); |
34c10968 | 512 | if (r < 0) { |
f5e04665 | 513 | log_error("Failed to parse PID."); |
f5e04665 LP |
514 | goto finish; |
515 | } | |
516 | ||
1eef15b1 | 517 | r = parse_gid(argv[INFO_GID + 1], &gid); |
34c10968 LP |
518 | if (r < 0) { |
519 | log_error("Failed to parse GID."); | |
520 | goto finish; | |
521 | } | |
522 | ||
1eef15b1 ZJS |
523 | if (get_process_comm(pid, &comm) < 0) { |
524 | log_warning("Failed to get COMM, falling back to the commandline."); | |
525 | comm = strv_join(argv + INFO_COMM + 1, " "); | |
526 | } | |
527 | ||
528 | if (get_process_exe(pid, &exe) < 0) | |
529 | log_warning("Failed to get EXE."); | |
530 | ||
531 | info[INFO_PID] = argv[INFO_PID + 1]; | |
532 | info[INFO_UID] = argv[INFO_UID + 1]; | |
533 | info[INFO_GID] = argv[INFO_GID + 1]; | |
534 | info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; | |
535 | info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; | |
536 | info[INFO_COMM] = comm; | |
537 | info[INFO_EXE] = exe; | |
538 | ||
ba1261bc | 539 | if (cg_pid_get_unit(pid, &t) >= 0) { |
803a3464 LP |
540 | |
541 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
803a3464 | 542 | |
34c10968 LP |
543 | /* If we are journald, we cut things short, |
544 | * don't write to the journal, but still | |
545 | * create a coredump. */ | |
546 | ||
547 | if (arg_storage != COREDUMP_STORAGE_NONE) | |
548 | arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
549 | ||
9fe13294 | 550 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 LP |
551 | if (r < 0) |
552 | goto finish; | |
553 | ||
9fe13294 | 554 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
555 | if (r < 0) |
556 | goto finish; | |
557 | ||
9fe13294 | 558 | log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); |
803a3464 LP |
559 | goto finish; |
560 | } | |
561 | ||
562 | core_unit = strappend("COREDUMP_UNIT=", t); | |
b7f7c685 | 563 | } else if (cg_pid_get_user_unit(pid, &t) >= 0) |
f9045468 | 564 | core_unit = strappend("COREDUMP_USER_UNIT=", t); |
803a3464 | 565 | |
f9045468 MT |
566 | if (core_unit) |
567 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
568 | ||
34c10968 LP |
569 | /* OK, now we know it's not the journal, hence we can make use |
570 | * of it now. */ | |
803a3464 LP |
571 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
572 | log_open(); | |
573 | ||
1eef15b1 | 574 | core_pid = strappend("COREDUMP_PID=", info[INFO_PID]); |
f5e04665 LP |
575 | if (core_pid) |
576 | IOVEC_SET_STRING(iovec[j++], core_pid); | |
577 | ||
1eef15b1 | 578 | core_uid = strappend("COREDUMP_UID=", info[INFO_UID]); |
f5e04665 LP |
579 | if (core_uid) |
580 | IOVEC_SET_STRING(iovec[j++], core_uid); | |
581 | ||
1eef15b1 | 582 | core_gid = strappend("COREDUMP_GID=", info[INFO_GID]); |
f5e04665 LP |
583 | if (core_gid) |
584 | IOVEC_SET_STRING(iovec[j++], core_gid); | |
585 | ||
1eef15b1 | 586 | core_signal = strappend("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); |
f5e04665 LP |
587 | if (core_signal) |
588 | IOVEC_SET_STRING(iovec[j++], core_signal); | |
589 | ||
f5e04665 LP |
590 | if (sd_pid_get_session(pid, &t) >= 0) { |
591 | core_session = strappend("COREDUMP_SESSION=", t); | |
592 | free(t); | |
593 | ||
594 | if (core_session) | |
595 | IOVEC_SET_STRING(iovec[j++], core_session); | |
596 | } | |
597 | ||
a035f819 | 598 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
7de80bfe KZ |
599 | r = asprintf(&core_owner_uid, |
600 | "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); | |
601 | if (r > 0) | |
a035f819 LP |
602 | IOVEC_SET_STRING(iovec[j++], core_owner_uid); |
603 | } | |
604 | ||
605 | if (sd_pid_get_slice(pid, &t) >= 0) { | |
606 | core_slice = strappend("COREDUMP_SLICE=", t); | |
607 | free(t); | |
608 | ||
609 | if (core_slice) | |
610 | IOVEC_SET_STRING(iovec[j++], core_slice); | |
611 | } | |
612 | ||
1eef15b1 ZJS |
613 | if (comm) { |
614 | core_comm = strappend("COREDUMP_COMM=", comm); | |
615 | if (core_comm) | |
616 | IOVEC_SET_STRING(iovec[j++], core_comm); | |
617 | } | |
618 | ||
619 | if (exe) { | |
8d4e028f | 620 | core_exe = strappend("COREDUMP_EXE=", exe); |
f5e04665 LP |
621 | if (core_exe) |
622 | IOVEC_SET_STRING(iovec[j++], core_exe); | |
623 | } | |
624 | ||
9bdbc2e2 | 625 | if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
f5e04665 LP |
626 | core_cmdline = strappend("COREDUMP_CMDLINE=", t); |
627 | free(t); | |
628 | ||
629 | if (core_cmdline) | |
630 | IOVEC_SET_STRING(iovec[j++], core_cmdline); | |
631 | } | |
632 | ||
a035f819 LP |
633 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
634 | core_cgroup = strappend("COREDUMP_CGROUP=", t); | |
635 | free(t); | |
636 | ||
637 | if (core_cgroup) | |
638 | IOVEC_SET_STRING(iovec[j++], core_cgroup); | |
639 | } | |
640 | ||
1eef15b1 | 641 | core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); |
f5e04665 LP |
642 | if (core_timestamp) |
643 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
644 | ||
645 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
646 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
647 | ||
0dc5d23c LP |
648 | /* Vacuum before we write anything again */ |
649 | coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
650 | ||
34c10968 | 651 | /* Always stream the coredump to disk, if that's possible */ |
9fe13294 | 652 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 | 653 | if (r < 0) |
2424a475 ZJS |
654 | /* skip whole core dumping part */ |
655 | goto log; | |
34c10968 LP |
656 | |
657 | /* If we don't want to keep the coredump on disk, remove it | |
8d4e028f LP |
658 | * now, as later on we will lack the privileges for |
659 | * it. However, we keep the fd to it, so that we can still | |
660 | * process it and log it. */ | |
9fe13294 | 661 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
662 | if (r < 0) |
663 | goto finish; | |
9fe13294 ZJS |
664 | if (r == 0) { |
665 | const char *coredump_filename; | |
666 | ||
667 | coredump_filename = strappenda("COREDUMP_FILENAME=", filename); | |
668 | IOVEC_SET_STRING(iovec[j++], coredump_filename); | |
669 | } | |
34c10968 | 670 | |
0dc5d23c LP |
671 | /* Vacuum again, but exclude the coredump we just created */ |
672 | coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use); | |
673 | ||
fee80f69 LP |
674 | /* Now, let's drop privileges to become the user who owns the |
675 | * segfaulted process and allocate the coredump memory under | |
b26c631a KP |
676 | * the user's uid. This also ensures that the credentials |
677 | * journald will see are the ones of the coredumping user, | |
678 | * thus making sure the user gets access to the core dump. */ | |
fee80f69 LP |
679 | if (setresgid(gid, gid, gid) < 0 || |
680 | setresuid(uid, uid, uid) < 0) { | |
681 | log_error("Failed to drop privileges: %m"); | |
682 | r = -errno; | |
683 | goto finish; | |
684 | } | |
685 | ||
8d4e028f LP |
686 | #ifdef HAVE_ELFUTILS |
687 | /* Try to get a strack trace if we can */ | |
688 | if (coredump_size <= arg_process_size_max) { | |
689 | _cleanup_free_ char *stacktrace = NULL; | |
690 | ||
691 | r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); | |
692 | if (r >= 0) | |
1eef15b1 | 693 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); |
4d229b31 UTL |
694 | else if (r == -EINVAL) |
695 | log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno())); | |
8d4e028f LP |
696 | else |
697 | log_warning("Failed to generate stack trace: %s", strerror(-r)); | |
698 | } | |
699 | ||
700 | if (!core_message) | |
701 | #endif | |
2424a475 | 702 | log: |
1eef15b1 | 703 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); |
8d4e028f LP |
704 | if (core_message) |
705 | IOVEC_SET_STRING(iovec[j++], core_message); | |
706 | ||
34c10968 LP |
707 | /* Optionally store the entire coredump in the journal */ |
708 | if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && | |
709 | coredump_size <= (off_t) arg_journal_size_max) { | |
710 | size_t sz; | |
fee80f69 | 711 | |
34c10968 | 712 | /* Store the coredump itself in the journal */ |
fee80f69 | 713 | |
34c10968 LP |
714 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
715 | if (r >= 0) { | |
716 | iovec[j].iov_base = coredump_data; | |
717 | iovec[j].iov_len = sz; | |
718 | j++; | |
ca0ceb6f | 719 | } |
fee80f69 LP |
720 | } |
721 | ||
f5e04665 LP |
722 | r = sd_journal_sendv(iovec, j); |
723 | if (r < 0) | |
872c8faa | 724 | log_error("Failed to log coredump: %s", strerror(-r)); |
f5e04665 LP |
725 | |
726 | finish: | |
f5e04665 LP |
727 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
728 | } |