]>
Commit | Line | Data |
---|---|---|
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); | |
4a62c710 MS |
145 | if (!acl) |
146 | return log_error_errno(errno, "Failed to get ACL: %m"); | |
34c10968 LP |
147 | |
148 | if (acl_create_entry(&acl, &entry) < 0 || | |
149 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
150 | acl_set_qualifier(entry, &uid) < 0) { | |
56f64d95 | 151 | log_error_errno(errno, "Failed to patch ACL: %m"); |
34c10968 LP |
152 | return -errno; |
153 | } | |
154 | ||
155 | if (acl_get_permset(entry, &permset) < 0 || | |
156 | acl_add_perm(permset, ACL_READ) < 0 || | |
157 | calc_acl_mask_if_needed(&acl) < 0) { | |
56f64d95 | 158 | log_warning_errno(errno, "Failed to patch ACL: %m"); |
34c10968 LP |
159 | return -errno; |
160 | } | |
161 | ||
4a62c710 MS |
162 | if (acl_set_fd(fd, acl) < 0) |
163 | return log_error_errno(errno, "Failed to apply ACL: %m"); | |
34c10968 LP |
164 | #endif |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
1eef15b1 | 169 | static int fix_xattr(int fd, const char *info[_INFO_LEN]) { |
0cd77f97 | 170 | |
1eef15b1 ZJS |
171 | static const char * const xattrs[_INFO_LEN] = { |
172 | [INFO_PID] = "user.coredump.pid", | |
173 | [INFO_UID] = "user.coredump.uid", | |
174 | [INFO_GID] = "user.coredump.gid", | |
175 | [INFO_SIGNAL] = "user.coredump.signal", | |
176 | [INFO_TIMESTAMP] = "user.coredump.timestamp", | |
177 | [INFO_COMM] = "user.coredump.comm", | |
178 | [INFO_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
179 | }; |
180 | ||
34c10968 | 181 | int r = 0; |
0cd77f97 | 182 | unsigned i; |
34c10968 | 183 | |
b59233e6 LP |
184 | assert(fd >= 0); |
185 | ||
1eef15b1 | 186 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
187 | * attributes. Just because we can. */ |
188 | ||
1eef15b1 ZJS |
189 | for (i = 0; i < _INFO_LEN; i++) { |
190 | int k; | |
191 | ||
192 | if (isempty(info[i]) || !xattrs[i]) | |
0cd77f97 | 193 | continue; |
34c10968 | 194 | |
1eef15b1 ZJS |
195 | k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); |
196 | if (k < 0 && r == 0) | |
34c10968 | 197 | r = -errno; |
0cd77f97 | 198 | } |
34c10968 LP |
199 | |
200 | return r; | |
201 | } | |
202 | ||
b0b21dce | 203 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 204 | |
b59233e6 LP |
205 | static int fix_permissions( |
206 | int fd, | |
207 | const char *filename, | |
208 | const char *target, | |
209 | const char *info[_INFO_LEN], | |
210 | uid_t uid) { | |
211 | ||
212 | assert(fd >= 0); | |
213 | assert(filename); | |
214 | assert(target); | |
215 | assert(info); | |
cfd652ed ZJS |
216 | |
217 | /* Ignore errors on these */ | |
218 | fchmod(fd, 0640); | |
219 | fix_acl(fd, uid); | |
220 | fix_xattr(fd, info); | |
221 | ||
4a62c710 MS |
222 | if (fsync(fd) < 0) |
223 | return log_error_errno(errno, "Failed to sync coredump %s: %m", filename); | |
cfd652ed | 224 | |
4a62c710 MS |
225 | if (rename(filename, target) < 0) |
226 | return log_error_errno(errno, "Failed to rename coredump %s -> %s: %m", filename, target); | |
cfd652ed ZJS |
227 | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static int maybe_remove_external_coredump(const char *filename, off_t size) { | |
232 | ||
b59233e6 | 233 | /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
cfd652ed ZJS |
234 | |
235 | if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && | |
236 | size <= arg_external_size_max) | |
237 | return 0; | |
238 | ||
239 | if (!filename) | |
240 | return 1; | |
241 | ||
4a62c710 MS |
242 | if (unlink(filename) < 0 && errno != ENOENT) |
243 | return log_error_errno(errno, "Failed to unlink %s: %m", filename); | |
cfd652ed ZJS |
244 | |
245 | return 1; | |
246 | } | |
247 | ||
b59233e6 LP |
248 | static int make_filename(const char *info[_INFO_LEN], char **ret) { |
249 | _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; | |
34c10968 | 250 | sd_id128_t boot; |
34c10968 LP |
251 | int r; |
252 | ||
1eef15b1 | 253 | assert(info); |
34c10968 | 254 | |
1eef15b1 | 255 | c = filename_escape(info[INFO_COMM]); |
34c10968 | 256 | if (!c) |
b59233e6 | 257 | return -ENOMEM; |
34c10968 | 258 | |
0dc5d23c LP |
259 | u = filename_escape(info[INFO_UID]); |
260 | if (!u) | |
b59233e6 | 261 | return -ENOMEM; |
34c10968 LP |
262 | |
263 | r = sd_id128_get_boot(&boot); | |
b59233e6 | 264 | if (r < 0) |
34c10968 | 265 | return r; |
34c10968 | 266 | |
b59233e6 LP |
267 | p = filename_escape(info[INFO_PID]); |
268 | if (!p) | |
269 | return -ENOMEM; | |
270 | ||
271 | t = filename_escape(info[INFO_TIMESTAMP]); | |
272 | if (!t) | |
273 | return -ENOMEM; | |
274 | ||
275 | if (asprintf(ret, | |
0dc5d23c | 276 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
34c10968 | 277 | c, |
0dc5d23c | 278 | u, |
34c10968 LP |
279 | SD_ID128_FORMAT_VAL(boot), |
280 | p, | |
b59233e6 LP |
281 | t) < 0) |
282 | return -ENOMEM; | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static int save_external_coredump( | |
288 | const char *info[_INFO_LEN], | |
289 | uid_t uid, | |
290 | char **ret_filename, | |
291 | int *ret_fd, | |
292 | off_t *ret_size) { | |
293 | ||
294 | _cleanup_free_ char *fn = NULL, *tmp = NULL; | |
295 | _cleanup_close_ int fd = -1; | |
296 | struct stat st; | |
297 | int r; | |
298 | ||
299 | assert(info); | |
300 | assert(ret_filename); | |
301 | assert(ret_fd); | |
302 | assert(ret_size); | |
303 | ||
304 | r = make_filename(info, &fn); | |
23bbb0de MS |
305 | if (r < 0) |
306 | return log_error_errno(r, "Failed to determine coredump file name: %m"); | |
34c10968 LP |
307 | |
308 | tmp = tempfn_random(fn); | |
309 | if (!tmp) | |
310 | return log_oom(); | |
803a3464 | 311 | |
d2e54fae | 312 | mkdir_p_label("/var/lib/systemd/coredump", 0755); |
803a3464 | 313 | |
34c10968 | 314 | fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
4a62c710 MS |
315 | if (fd < 0) |
316 | return log_error_errno(errno, "Failed to create coredump file %s: %m", tmp); | |
803a3464 | 317 | |
93240d3a | 318 | r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max); |
84ee0960 | 319 | if (r == -EFBIG) { |
0dc5d23c | 320 | log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
321 | goto fail; |
322 | } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { | |
0dc5d23c | 323 | log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
324 | goto fail; |
325 | } else if (r < 0) { | |
da927ba9 | 326 | log_error_errno(r, "Failed to dump coredump to file: %m"); |
34c10968 LP |
327 | goto fail; |
328 | } | |
803a3464 | 329 | |
34c10968 | 330 | if (fstat(fd, &st) < 0) { |
56f64d95 | 331 | log_error_errno(errno, "Failed to fstat coredump %s: %m", tmp); |
34c10968 LP |
332 | goto fail; |
333 | } | |
334 | ||
7849c2ac | 335 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
56f64d95 | 336 | log_error_errno(errno, "Failed to seek on %s: %m", tmp); |
b59233e6 | 337 | goto fail; |
7849c2ac TA |
338 | } |
339 | ||
d89c8fdf | 340 | #if defined(HAVE_XZ) || defined(HAVE_LZ4) |
cfd652ed | 341 | /* If we will remove the coredump anyway, do not compress. */ |
34727273 | 342 | if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
8c9571d0 | 343 | && arg_compress) { |
cfd652ed | 344 | |
b59233e6 LP |
345 | _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
346 | _cleanup_close_ int fd_compressed = -1; | |
cfd652ed | 347 | |
d89c8fdf | 348 | fn_compressed = strappend(fn, COMPRESSED_EXT); |
b59233e6 | 349 | if (!fn_compressed) { |
d89c8fdf | 350 | log_oom(); |
cfd652ed ZJS |
351 | goto uncompressed; |
352 | } | |
353 | ||
b59233e6 LP |
354 | tmp_compressed = tempfn_random(fn_compressed); |
355 | if (!tmp_compressed) { | |
d89c8fdf | 356 | log_oom(); |
b59233e6 | 357 | goto uncompressed; |
cfd652ed ZJS |
358 | } |
359 | ||
b59233e6 LP |
360 | fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
361 | if (fd_compressed < 0) { | |
56f64d95 | 362 | log_error_errno(errno, "Failed to create file %s: %m", tmp_compressed); |
b59233e6 | 363 | goto uncompressed; |
cfd652ed ZJS |
364 | } |
365 | ||
d89c8fdf | 366 | r = compress_stream(fd, fd_compressed, -1); |
b59233e6 | 367 | if (r < 0) { |
da927ba9 | 368 | log_error_errno(r, "Failed to compress %s: %m", tmp_compressed); |
b59233e6 LP |
369 | goto fail_compressed; |
370 | } | |
371 | ||
372 | r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid); | |
cfd652ed | 373 | if (r < 0) |
b59233e6 LP |
374 | goto fail_compressed; |
375 | ||
376 | /* OK, this worked, we can get rid of the uncompressed version now */ | |
377 | unlink_noerrno(tmp); | |
cfd652ed | 378 | |
b59233e6 LP |
379 | *ret_filename = fn_compressed; /* compressed */ |
380 | *ret_fd = fd; /* uncompressed */ | |
381 | *ret_size = st.st_size; /* uncompressed */ | |
cfd652ed | 382 | |
b59233e6 | 383 | fn_compressed = NULL; |
cfd652ed ZJS |
384 | fd = -1; |
385 | ||
386 | return 0; | |
387 | ||
b59233e6 LP |
388 | fail_compressed: |
389 | unlink_noerrno(tmp_compressed); | |
34c10968 | 390 | } |
cfd652ed ZJS |
391 | |
392 | uncompressed: | |
3b1a55e1 | 393 | #endif |
cfd652ed ZJS |
394 | r = fix_permissions(fd, tmp, fn, info, uid); |
395 | if (r < 0) | |
396 | goto fail; | |
34c10968 LP |
397 | |
398 | *ret_filename = fn; | |
399 | *ret_fd = fd; | |
400 | *ret_size = st.st_size; | |
401 | ||
402 | fn = NULL; | |
403 | fd = -1; | |
404 | ||
405 | return 0; | |
406 | ||
407 | fail: | |
408 | unlink_noerrno(tmp); | |
409 | return r; | |
410 | } | |
411 | ||
412 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
413 | _cleanup_free_ char *field = NULL; | |
414 | ssize_t n; | |
415 | ||
8d4e028f | 416 | assert(fd >= 0); |
34c10968 LP |
417 | assert(ret); |
418 | assert(ret_size); | |
419 | ||
4a62c710 MS |
420 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
421 | return log_warning_errno(errno, "Failed to seek: %m"); | |
803a3464 | 422 | |
34c10968 LP |
423 | field = malloc(9 + size); |
424 | if (!field) { | |
cfd652ed | 425 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
426 | return -ENOMEM; |
427 | } | |
428 | ||
429 | memcpy(field, "COREDUMP=", 9); | |
430 | ||
431 | n = read(fd, field + 9, size); | |
23bbb0de MS |
432 | if (n < 0) |
433 | return log_error_errno((int) n, "Failed to read core data: %m"); | |
34c10968 LP |
434 | if ((size_t) n < size) { |
435 | log_error("Core data too short."); | |
436 | return -EIO; | |
437 | } | |
438 | ||
439 | *ret = field; | |
440 | *ret_size = size + 9; | |
441 | ||
442 | field = NULL; | |
443 | ||
444 | return 0; | |
445 | } | |
803a3464 | 446 | |
3f132692 JF |
447 | /* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines: |
448 | * 0:/dev/pts/23 | |
449 | * pos: 0 | |
450 | * flags: 0100002 | |
451 | * | |
452 | * 1:/dev/pts/23 | |
453 | * pos: 0 | |
454 | * flags: 0100002 | |
455 | * | |
456 | * 2:/dev/pts/23 | |
457 | * pos: 0 | |
458 | * flags: 0100002 | |
459 | * EOF | |
460 | */ | |
461 | static int compose_open_fds(pid_t pid, char **open_fds) { | |
4d84bc2f LP |
462 | _cleanup_closedir_ DIR *proc_fd_dir = NULL; |
463 | _cleanup_close_ int proc_fdinfo_fd = -1; | |
464 | _cleanup_free_ char *buffer = NULL; | |
3f132692 | 465 | _cleanup_fclose_ FILE *stream = NULL; |
59059b4a | 466 | const char *fddelim = "", *path; |
3f132692 | 467 | struct dirent *dent = NULL; |
4d84bc2f | 468 | size_t size = 0; |
3f132692 JF |
469 | int r = 0; |
470 | ||
471 | assert(pid >= 0); | |
472 | assert(open_fds != NULL); | |
473 | ||
59059b4a | 474 | path = procfs_file_alloca(pid, "fd"); |
3f132692 | 475 | proc_fd_dir = opendir(path); |
59059b4a ZJS |
476 | if (!proc_fd_dir) |
477 | return -errno; | |
3f132692 | 478 | |
4d84bc2f | 479 | proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH); |
59059b4a ZJS |
480 | if (proc_fdinfo_fd < 0) |
481 | return -errno; | |
3f132692 | 482 | |
4d84bc2f | 483 | stream = open_memstream(&buffer, &size); |
3f132692 JF |
484 | if (!stream) |
485 | return -ENOMEM; | |
486 | ||
4d84bc2f | 487 | FOREACH_DIRENT(dent, proc_fd_dir, return -errno) { |
3f132692 | 488 | _cleanup_fclose_ FILE *fdinfo = NULL; |
4d84bc2f | 489 | _cleanup_free_ char *fdname = NULL; |
59059b4a | 490 | char line[LINE_MAX]; |
4d84bc2f | 491 | int fd; |
3f132692 | 492 | |
59059b4a | 493 | r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname); |
3f132692 JF |
494 | if (r < 0) |
495 | return r; | |
496 | ||
497 | fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname); | |
498 | fddelim = "\n"; | |
499 | ||
500 | /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */ | |
59059b4a ZJS |
501 | fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY); |
502 | if (fd < 0) | |
3f132692 JF |
503 | continue; |
504 | ||
59059b4a ZJS |
505 | fdinfo = fdopen(fd, "re"); |
506 | if (fdinfo == NULL) { | |
507 | close(fd); | |
3f132692 | 508 | continue; |
59059b4a | 509 | } |
3f132692 | 510 | |
4d84bc2f LP |
511 | FOREACH_LINE(line, fdinfo, break) { |
512 | fputs(line, stream); | |
513 | if (!endswith(line, "\n")) | |
514 | fputc('\n', stream); | |
515 | } | |
3f132692 JF |
516 | } |
517 | ||
4d84bc2f LP |
518 | errno = 0; |
519 | fclose(stream); | |
520 | stream = NULL; | |
521 | ||
522 | if (errno != 0) | |
523 | return -errno; | |
524 | ||
525 | *open_fds = buffer; | |
526 | buffer = NULL; | |
527 | ||
3f132692 JF |
528 | return 0; |
529 | } | |
530 | ||
f5e04665 | 531 | int main(int argc, char* argv[]) { |
34c10968 LP |
532 | |
533 | _cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
534 | *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL, | |
535 | *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL, | |
3f132692 JF |
536 | *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL, *core_open_fds = NULL, |
537 | *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL, *core_proc_cgroup = NULL, | |
538 | *core_cwd = NULL, *core_root = NULL, *core_environ = NULL, | |
9fe13294 | 539 | *exe = NULL, *comm = NULL, *filename = NULL; |
1eef15b1 | 540 | const char *info[_INFO_LEN]; |
34c10968 LP |
541 | |
542 | _cleanup_close_ int coredump_fd = -1; | |
543 | ||
3f132692 | 544 | struct iovec iovec[26]; |
34c10968 | 545 | off_t coredump_size; |
f5e04665 | 546 | int r, j = 0; |
a035f819 | 547 | uid_t uid, owner_uid; |
fee80f69 | 548 | gid_t gid; |
a035f819 | 549 | pid_t pid; |
34c10968 | 550 | char *t; |
3f132692 | 551 | const char *p; |
f5e04665 | 552 | |
34c10968 | 553 | /* Make sure we never enter a loop */ |
803a3464 | 554 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 | 555 | |
34c10968 LP |
556 | /* First, log to a safe place, since we don't know what |
557 | * crashed and it might be journald which we'd rather not log | |
558 | * to then. */ | |
559 | log_set_target(LOG_TARGET_KMSG); | |
34c10968 | 560 | log_open(); |
803a3464 | 561 | |
1eef15b1 ZJS |
562 | if (argc < INFO_COMM + 1) { |
563 | log_error("Not enough arguments passed from kernel (%d, expected %d).", | |
564 | argc - 1, INFO_COMM + 1 - 1); | |
f5e04665 LP |
565 | r = -EINVAL; |
566 | goto finish; | |
567 | } | |
568 | ||
34c10968 LP |
569 | /* Ignore all parse errors */ |
570 | parse_config(); | |
8c9571d0 LP |
571 | |
572 | log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); | |
573 | log_debug("Selected compression %s.", yes_no(arg_compress)); | |
34c10968 | 574 | |
1eef15b1 | 575 | r = parse_uid(argv[INFO_UID + 1], &uid); |
f5e04665 | 576 | if (r < 0) { |
34c10968 LP |
577 | log_error("Failed to parse UID."); |
578 | goto finish; | |
579 | } | |
803a3464 | 580 | |
1eef15b1 | 581 | r = parse_pid(argv[INFO_PID + 1], &pid); |
34c10968 | 582 | if (r < 0) { |
f5e04665 | 583 | log_error("Failed to parse PID."); |
f5e04665 LP |
584 | goto finish; |
585 | } | |
586 | ||
1eef15b1 | 587 | r = parse_gid(argv[INFO_GID + 1], &gid); |
34c10968 LP |
588 | if (r < 0) { |
589 | log_error("Failed to parse GID."); | |
590 | goto finish; | |
591 | } | |
592 | ||
1eef15b1 | 593 | if (get_process_comm(pid, &comm) < 0) { |
3f85ef0f | 594 | log_warning("Failed to get COMM, falling back to the command line."); |
1eef15b1 ZJS |
595 | comm = strv_join(argv + INFO_COMM + 1, " "); |
596 | } | |
597 | ||
598 | if (get_process_exe(pid, &exe) < 0) | |
599 | log_warning("Failed to get EXE."); | |
600 | ||
601 | info[INFO_PID] = argv[INFO_PID + 1]; | |
602 | info[INFO_UID] = argv[INFO_UID + 1]; | |
603 | info[INFO_GID] = argv[INFO_GID + 1]; | |
604 | info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; | |
605 | info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; | |
606 | info[INFO_COMM] = comm; | |
607 | info[INFO_EXE] = exe; | |
608 | ||
ba1261bc | 609 | if (cg_pid_get_unit(pid, &t) >= 0) { |
803a3464 LP |
610 | |
611 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
803a3464 | 612 | |
34c10968 LP |
613 | /* If we are journald, we cut things short, |
614 | * don't write to the journal, but still | |
615 | * create a coredump. */ | |
616 | ||
617 | if (arg_storage != COREDUMP_STORAGE_NONE) | |
618 | arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
619 | ||
9fe13294 | 620 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 LP |
621 | if (r < 0) |
622 | goto finish; | |
623 | ||
9fe13294 | 624 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
625 | if (r < 0) |
626 | goto finish; | |
627 | ||
9fe13294 | 628 | log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); |
803a3464 LP |
629 | goto finish; |
630 | } | |
631 | ||
632 | core_unit = strappend("COREDUMP_UNIT=", t); | |
b7f7c685 | 633 | } else if (cg_pid_get_user_unit(pid, &t) >= 0) |
f9045468 | 634 | core_unit = strappend("COREDUMP_USER_UNIT=", t); |
803a3464 | 635 | |
f9045468 MT |
636 | if (core_unit) |
637 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
638 | ||
34c10968 LP |
639 | /* OK, now we know it's not the journal, hence we can make use |
640 | * of it now. */ | |
803a3464 LP |
641 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
642 | log_open(); | |
643 | ||
1eef15b1 | 644 | core_pid = strappend("COREDUMP_PID=", info[INFO_PID]); |
f5e04665 LP |
645 | if (core_pid) |
646 | IOVEC_SET_STRING(iovec[j++], core_pid); | |
647 | ||
1eef15b1 | 648 | core_uid = strappend("COREDUMP_UID=", info[INFO_UID]); |
f5e04665 LP |
649 | if (core_uid) |
650 | IOVEC_SET_STRING(iovec[j++], core_uid); | |
651 | ||
1eef15b1 | 652 | core_gid = strappend("COREDUMP_GID=", info[INFO_GID]); |
f5e04665 LP |
653 | if (core_gid) |
654 | IOVEC_SET_STRING(iovec[j++], core_gid); | |
655 | ||
1eef15b1 | 656 | core_signal = strappend("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); |
f5e04665 LP |
657 | if (core_signal) |
658 | IOVEC_SET_STRING(iovec[j++], core_signal); | |
659 | ||
f5e04665 LP |
660 | if (sd_pid_get_session(pid, &t) >= 0) { |
661 | core_session = strappend("COREDUMP_SESSION=", t); | |
662 | free(t); | |
663 | ||
664 | if (core_session) | |
665 | IOVEC_SET_STRING(iovec[j++], core_session); | |
666 | } | |
667 | ||
a035f819 | 668 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
7de80bfe KZ |
669 | r = asprintf(&core_owner_uid, |
670 | "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); | |
671 | if (r > 0) | |
a035f819 LP |
672 | IOVEC_SET_STRING(iovec[j++], core_owner_uid); |
673 | } | |
674 | ||
675 | if (sd_pid_get_slice(pid, &t) >= 0) { | |
676 | core_slice = strappend("COREDUMP_SLICE=", t); | |
677 | free(t); | |
678 | ||
679 | if (core_slice) | |
680 | IOVEC_SET_STRING(iovec[j++], core_slice); | |
681 | } | |
682 | ||
1eef15b1 ZJS |
683 | if (comm) { |
684 | core_comm = strappend("COREDUMP_COMM=", comm); | |
685 | if (core_comm) | |
686 | IOVEC_SET_STRING(iovec[j++], core_comm); | |
687 | } | |
688 | ||
689 | if (exe) { | |
8d4e028f | 690 | core_exe = strappend("COREDUMP_EXE=", exe); |
f5e04665 LP |
691 | if (core_exe) |
692 | IOVEC_SET_STRING(iovec[j++], core_exe); | |
693 | } | |
694 | ||
9bdbc2e2 | 695 | if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
f5e04665 LP |
696 | core_cmdline = strappend("COREDUMP_CMDLINE=", t); |
697 | free(t); | |
698 | ||
699 | if (core_cmdline) | |
700 | IOVEC_SET_STRING(iovec[j++], core_cmdline); | |
701 | } | |
702 | ||
a035f819 LP |
703 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
704 | core_cgroup = strappend("COREDUMP_CGROUP=", t); | |
705 | free(t); | |
706 | ||
707 | if (core_cgroup) | |
708 | IOVEC_SET_STRING(iovec[j++], core_cgroup); | |
709 | } | |
710 | ||
3f132692 JF |
711 | if (compose_open_fds(pid, &t) >= 0) { |
712 | core_open_fds = strappend("COREDUMP_OPEN_FDS=", t); | |
713 | free(t); | |
714 | ||
715 | if (core_open_fds) | |
716 | IOVEC_SET_STRING(iovec[j++], core_open_fds); | |
717 | } | |
718 | ||
719 | p = procfs_file_alloca(pid, "status"); | |
720 | if (read_full_file(p, &t, NULL) >= 0) { | |
721 | core_proc_status = strappend("COREDUMP_PROC_STATUS=", t); | |
722 | free(t); | |
723 | ||
724 | if (core_proc_status) | |
725 | IOVEC_SET_STRING(iovec[j++], core_proc_status); | |
726 | } | |
727 | ||
728 | p = procfs_file_alloca(pid, "maps"); | |
729 | if (read_full_file(p, &t, NULL) >= 0) { | |
730 | core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t); | |
731 | free(t); | |
732 | ||
733 | if (core_proc_maps) | |
734 | IOVEC_SET_STRING(iovec[j++], core_proc_maps); | |
735 | } | |
736 | ||
737 | p = procfs_file_alloca(pid, "limits"); | |
738 | if (read_full_file(p, &t, NULL) >= 0) { | |
739 | core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t); | |
740 | free(t); | |
741 | ||
742 | if (core_proc_limits) | |
743 | IOVEC_SET_STRING(iovec[j++], core_proc_limits); | |
744 | } | |
745 | ||
746 | p = procfs_file_alloca(pid, "cgroup"); | |
747 | if (read_full_file(p, &t, NULL) >=0) { | |
748 | core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t); | |
749 | free(t); | |
750 | ||
751 | if (core_proc_cgroup) | |
752 | IOVEC_SET_STRING(iovec[j++], core_proc_cgroup); | |
753 | } | |
754 | ||
755 | if (get_process_cwd(pid, &t) >= 0) { | |
756 | core_cwd = strappend("COREDUMP_CWD=", t); | |
757 | free(t); | |
758 | ||
759 | if (core_cwd) | |
760 | IOVEC_SET_STRING(iovec[j++], core_cwd); | |
761 | } | |
762 | ||
763 | if (get_process_root(pid, &t) >= 0) { | |
764 | core_root = strappend("COREDUMP_ROOT=", t); | |
765 | free(t); | |
766 | ||
767 | if (core_root) | |
768 | IOVEC_SET_STRING(iovec[j++], core_root); | |
769 | } | |
770 | ||
771 | if (get_process_environ(pid, &t) >= 0) { | |
772 | core_environ = strappend("COREDUMP_ENVIRON=", t); | |
773 | free(t); | |
774 | ||
775 | if (core_environ) | |
776 | IOVEC_SET_STRING(iovec[j++], core_environ); | |
777 | } | |
778 | ||
1eef15b1 | 779 | core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); |
f5e04665 LP |
780 | if (core_timestamp) |
781 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
782 | ||
783 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
784 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
785 | ||
0dc5d23c LP |
786 | /* Vacuum before we write anything again */ |
787 | coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
788 | ||
34c10968 | 789 | /* Always stream the coredump to disk, if that's possible */ |
9fe13294 | 790 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 | 791 | if (r < 0) |
2424a475 ZJS |
792 | /* skip whole core dumping part */ |
793 | goto log; | |
34c10968 LP |
794 | |
795 | /* If we don't want to keep the coredump on disk, remove it | |
8d4e028f LP |
796 | * now, as later on we will lack the privileges for |
797 | * it. However, we keep the fd to it, so that we can still | |
798 | * process it and log it. */ | |
9fe13294 | 799 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
800 | if (r < 0) |
801 | goto finish; | |
9fe13294 ZJS |
802 | if (r == 0) { |
803 | const char *coredump_filename; | |
804 | ||
805 | coredump_filename = strappenda("COREDUMP_FILENAME=", filename); | |
806 | IOVEC_SET_STRING(iovec[j++], coredump_filename); | |
807 | } | |
34c10968 | 808 | |
0dc5d23c LP |
809 | /* Vacuum again, but exclude the coredump we just created */ |
810 | coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use); | |
811 | ||
fee80f69 LP |
812 | /* Now, let's drop privileges to become the user who owns the |
813 | * segfaulted process and allocate the coredump memory under | |
b26c631a KP |
814 | * the user's uid. This also ensures that the credentials |
815 | * journald will see are the ones of the coredumping user, | |
816 | * thus making sure the user gets access to the core dump. */ | |
fee80f69 LP |
817 | if (setresgid(gid, gid, gid) < 0 || |
818 | setresuid(uid, uid, uid) < 0) { | |
56f64d95 | 819 | log_error_errno(errno, "Failed to drop privileges: %m"); |
fee80f69 LP |
820 | r = -errno; |
821 | goto finish; | |
822 | } | |
823 | ||
8d4e028f LP |
824 | #ifdef HAVE_ELFUTILS |
825 | /* Try to get a strack trace if we can */ | |
826 | if (coredump_size <= arg_process_size_max) { | |
827 | _cleanup_free_ char *stacktrace = NULL; | |
828 | ||
829 | r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); | |
830 | if (r >= 0) | |
1eef15b1 | 831 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); |
4d229b31 UTL |
832 | else if (r == -EINVAL) |
833 | log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno())); | |
8d4e028f | 834 | else |
da927ba9 | 835 | log_warning_errno(r, "Failed to generate stack trace: %m"); |
8d4e028f LP |
836 | } |
837 | ||
838 | if (!core_message) | |
839 | #endif | |
2424a475 | 840 | log: |
1eef15b1 | 841 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); |
8d4e028f LP |
842 | if (core_message) |
843 | IOVEC_SET_STRING(iovec[j++], core_message); | |
844 | ||
34c10968 LP |
845 | /* Optionally store the entire coredump in the journal */ |
846 | if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && | |
847 | coredump_size <= (off_t) arg_journal_size_max) { | |
848 | size_t sz; | |
fee80f69 | 849 | |
34c10968 | 850 | /* Store the coredump itself in the journal */ |
fee80f69 | 851 | |
34c10968 LP |
852 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
853 | if (r >= 0) { | |
854 | iovec[j].iov_base = coredump_data; | |
855 | iovec[j].iov_len = sz; | |
856 | j++; | |
ca0ceb6f | 857 | } |
fee80f69 LP |
858 | } |
859 | ||
f5e04665 LP |
860 | r = sd_journal_sendv(iovec, j); |
861 | if (r < 0) | |
da927ba9 | 862 | log_error_errno(r, "Failed to log coredump: %m"); |
f5e04665 LP |
863 | |
864 | finish: | |
f5e04665 LP |
865 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
866 | } |