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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> | |
cacd6403 | 26 | #include <sys/xattr.h> |
f5e04665 | 27 | |
4d229b31 UTL |
28 | #ifdef HAVE_ELFUTILS |
29 | # include <dwarf.h> | |
30 | # include <elfutils/libdwfl.h> | |
31 | #endif | |
32 | ||
f11943c5 LP |
33 | #include "sd-journal.h" |
34 | #include "sd-login.h" | |
f5e04665 LP |
35 | #include "log.h" |
36 | #include "util.h" | |
3f132692 | 37 | #include "fileio.h" |
1eef15b1 | 38 | #include "strv.h" |
b7f7c685 | 39 | #include "macro.h" |
49e942b2 | 40 | #include "mkdir.h" |
803a3464 | 41 | #include "special.h" |
ba1261bc | 42 | #include "cgroup-util.h" |
34c10968 LP |
43 | #include "conf-parser.h" |
44 | #include "copy.h" | |
8d4e028f | 45 | #include "stacktrace.h" |
cfd652ed | 46 | #include "compress.h" |
f8eeeaf9 | 47 | #include "acl-util.h" |
f11943c5 LP |
48 | #include "capability.h" |
49 | #include "journald-native.h" | |
50 | #include "coredump-vacuum.h" | |
34727273 | 51 | |
34c10968 LP |
52 | /* The maximum size up to which we process coredumps */ |
53 | #define PROCESS_SIZE_MAX ((off_t) (2LLU*1024LLU*1024LLU*1024LLU)) | |
54 | ||
55 | /* The maximum size up to which we leave the coredump around on | |
56 | * disk */ | |
57 | #define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX | |
58 | ||
59 | /* The maximum size up to which we store the coredump in the | |
60 | * journal */ | |
61 | #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) | |
f5e04665 | 62 | |
c4aa09b0 | 63 | /* Make sure to not make this larger than the maximum journal entry |
874bc134 ZJS |
64 | * size. See DATA_SIZE_MAX in journald-native.c. */ |
65 | assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); | |
f5e04665 LP |
66 | |
67 | enum { | |
1eef15b1 ZJS |
68 | INFO_PID, |
69 | INFO_UID, | |
70 | INFO_GID, | |
71 | INFO_SIGNAL, | |
72 | INFO_TIMESTAMP, | |
73 | INFO_COMM, | |
74 | INFO_EXE, | |
75 | _INFO_LEN | |
f5e04665 LP |
76 | }; |
77 | ||
34c10968 LP |
78 | typedef enum CoredumpStorage { |
79 | COREDUMP_STORAGE_NONE, | |
80 | COREDUMP_STORAGE_EXTERNAL, | |
81 | COREDUMP_STORAGE_JOURNAL, | |
82 | COREDUMP_STORAGE_BOTH, | |
83 | _COREDUMP_STORAGE_MAX, | |
84 | _COREDUMP_STORAGE_INVALID = -1 | |
85 | } CoredumpStorage; | |
86 | ||
34c10968 LP |
87 | static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = { |
88 | [COREDUMP_STORAGE_NONE] = "none", | |
89 | [COREDUMP_STORAGE_EXTERNAL] = "external", | |
90 | [COREDUMP_STORAGE_JOURNAL] = "journal", | |
91 | [COREDUMP_STORAGE_BOTH] = "both", | |
92 | }; | |
93 | ||
94 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage); | |
8c9571d0 | 95 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting"); |
34727273 ZJS |
96 | |
97 | static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
8c9571d0 | 98 | static bool arg_compress = true; |
34727273 ZJS |
99 | static off_t arg_process_size_max = PROCESS_SIZE_MAX; |
100 | static off_t arg_external_size_max = EXTERNAL_SIZE_MAX; | |
101 | static size_t arg_journal_size_max = JOURNAL_SIZE_MAX; | |
0dc5d23c LP |
102 | static off_t arg_keep_free = (off_t) -1; |
103 | static off_t arg_max_use = (off_t) -1; | |
34c10968 LP |
104 | |
105 | static int parse_config(void) { | |
34c10968 | 106 | static const ConfigTableItem items[] = { |
8c9571d0 LP |
107 | { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, |
108 | { "Coredump", "Compress", config_parse_bool, 0, &arg_compress }, | |
109 | { "Coredump", "ProcessSizeMax", config_parse_iec_off, 0, &arg_process_size_max }, | |
110 | { "Coredump", "ExternalSizeMax", config_parse_iec_off, 0, &arg_external_size_max }, | |
111 | { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, | |
112 | { "Coredump", "KeepFree", config_parse_iec_off, 0, &arg_keep_free }, | |
113 | { "Coredump", "MaxUse", config_parse_iec_off, 0, &arg_max_use }, | |
34c10968 LP |
114 | {} |
115 | }; | |
116 | ||
301af7e4 JT |
117 | return config_parse_many("/etc/systemd/coredump.conf", |
118 | CONF_DIRS_NULSTR("systemd/coredump.conf"), | |
119 | "Coredump\0", | |
120 | config_item_table_lookup, items, | |
121 | false, NULL); | |
34c10968 LP |
122 | } |
123 | ||
124 | static int fix_acl(int fd, uid_t uid) { | |
125 | ||
126 | #ifdef HAVE_ACL | |
127 | _cleanup_(acl_freep) acl_t acl = NULL; | |
128 | acl_entry_t entry; | |
129 | acl_permset_t permset; | |
130 | ||
b59233e6 LP |
131 | assert(fd >= 0); |
132 | ||
34c10968 LP |
133 | if (uid <= SYSTEM_UID_MAX) |
134 | return 0; | |
135 | ||
136 | /* Make sure normal users can read (but not write or delete) | |
137 | * their own coredumps */ | |
138 | ||
139 | acl = acl_get_fd(fd); | |
4a62c710 MS |
140 | if (!acl) |
141 | return log_error_errno(errno, "Failed to get ACL: %m"); | |
34c10968 LP |
142 | |
143 | if (acl_create_entry(&acl, &entry) < 0 || | |
144 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
145 | acl_set_qualifier(entry, &uid) < 0) { | |
56f64d95 | 146 | log_error_errno(errno, "Failed to patch ACL: %m"); |
34c10968 LP |
147 | return -errno; |
148 | } | |
149 | ||
150 | if (acl_get_permset(entry, &permset) < 0 || | |
151 | acl_add_perm(permset, ACL_READ) < 0 || | |
152 | calc_acl_mask_if_needed(&acl) < 0) { | |
56f64d95 | 153 | log_warning_errno(errno, "Failed to patch ACL: %m"); |
34c10968 LP |
154 | return -errno; |
155 | } | |
156 | ||
4a62c710 MS |
157 | if (acl_set_fd(fd, acl) < 0) |
158 | return log_error_errno(errno, "Failed to apply ACL: %m"); | |
34c10968 LP |
159 | #endif |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
1eef15b1 | 164 | static int fix_xattr(int fd, const char *info[_INFO_LEN]) { |
0cd77f97 | 165 | |
1eef15b1 ZJS |
166 | static const char * const xattrs[_INFO_LEN] = { |
167 | [INFO_PID] = "user.coredump.pid", | |
168 | [INFO_UID] = "user.coredump.uid", | |
169 | [INFO_GID] = "user.coredump.gid", | |
170 | [INFO_SIGNAL] = "user.coredump.signal", | |
171 | [INFO_TIMESTAMP] = "user.coredump.timestamp", | |
172 | [INFO_COMM] = "user.coredump.comm", | |
173 | [INFO_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
174 | }; |
175 | ||
34c10968 | 176 | int r = 0; |
0cd77f97 | 177 | unsigned i; |
34c10968 | 178 | |
b59233e6 LP |
179 | assert(fd >= 0); |
180 | ||
1eef15b1 | 181 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
182 | * attributes. Just because we can. */ |
183 | ||
1eef15b1 ZJS |
184 | for (i = 0; i < _INFO_LEN; i++) { |
185 | int k; | |
186 | ||
187 | if (isempty(info[i]) || !xattrs[i]) | |
0cd77f97 | 188 | continue; |
34c10968 | 189 | |
1eef15b1 ZJS |
190 | k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); |
191 | if (k < 0 && r == 0) | |
34c10968 | 192 | r = -errno; |
0cd77f97 | 193 | } |
34c10968 LP |
194 | |
195 | return r; | |
196 | } | |
197 | ||
b0b21dce | 198 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 199 | |
b59233e6 LP |
200 | static int fix_permissions( |
201 | int fd, | |
202 | const char *filename, | |
203 | const char *target, | |
204 | const char *info[_INFO_LEN], | |
205 | uid_t uid) { | |
206 | ||
207 | assert(fd >= 0); | |
208 | assert(filename); | |
209 | assert(target); | |
210 | assert(info); | |
cfd652ed ZJS |
211 | |
212 | /* Ignore errors on these */ | |
213 | fchmod(fd, 0640); | |
214 | fix_acl(fd, uid); | |
215 | fix_xattr(fd, info); | |
216 | ||
4a62c710 MS |
217 | if (fsync(fd) < 0) |
218 | return log_error_errno(errno, "Failed to sync coredump %s: %m", filename); | |
cfd652ed | 219 | |
4a62c710 MS |
220 | if (rename(filename, target) < 0) |
221 | return log_error_errno(errno, "Failed to rename coredump %s -> %s: %m", filename, target); | |
cfd652ed ZJS |
222 | |
223 | return 0; | |
224 | } | |
225 | ||
226 | static int maybe_remove_external_coredump(const char *filename, off_t size) { | |
227 | ||
b59233e6 | 228 | /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
cfd652ed ZJS |
229 | |
230 | if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && | |
231 | size <= arg_external_size_max) | |
232 | return 0; | |
233 | ||
234 | if (!filename) | |
235 | return 1; | |
236 | ||
4a62c710 MS |
237 | if (unlink(filename) < 0 && errno != ENOENT) |
238 | return log_error_errno(errno, "Failed to unlink %s: %m", filename); | |
cfd652ed ZJS |
239 | |
240 | return 1; | |
241 | } | |
242 | ||
b59233e6 LP |
243 | static int make_filename(const char *info[_INFO_LEN], char **ret) { |
244 | _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; | |
34c10968 | 245 | sd_id128_t boot; |
34c10968 LP |
246 | int r; |
247 | ||
1eef15b1 | 248 | assert(info); |
34c10968 | 249 | |
1eef15b1 | 250 | c = filename_escape(info[INFO_COMM]); |
34c10968 | 251 | if (!c) |
b59233e6 | 252 | return -ENOMEM; |
34c10968 | 253 | |
0dc5d23c LP |
254 | u = filename_escape(info[INFO_UID]); |
255 | if (!u) | |
b59233e6 | 256 | return -ENOMEM; |
34c10968 LP |
257 | |
258 | r = sd_id128_get_boot(&boot); | |
b59233e6 | 259 | if (r < 0) |
34c10968 | 260 | return r; |
34c10968 | 261 | |
b59233e6 LP |
262 | p = filename_escape(info[INFO_PID]); |
263 | if (!p) | |
264 | return -ENOMEM; | |
265 | ||
266 | t = filename_escape(info[INFO_TIMESTAMP]); | |
267 | if (!t) | |
268 | return -ENOMEM; | |
269 | ||
270 | if (asprintf(ret, | |
0dc5d23c | 271 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
34c10968 | 272 | c, |
0dc5d23c | 273 | u, |
34c10968 LP |
274 | SD_ID128_FORMAT_VAL(boot), |
275 | p, | |
b59233e6 LP |
276 | t) < 0) |
277 | return -ENOMEM; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int save_external_coredump( | |
283 | const char *info[_INFO_LEN], | |
284 | uid_t uid, | |
285 | char **ret_filename, | |
286 | int *ret_fd, | |
287 | off_t *ret_size) { | |
288 | ||
289 | _cleanup_free_ char *fn = NULL, *tmp = NULL; | |
290 | _cleanup_close_ int fd = -1; | |
291 | struct stat st; | |
292 | int r; | |
293 | ||
294 | assert(info); | |
295 | assert(ret_filename); | |
296 | assert(ret_fd); | |
297 | assert(ret_size); | |
298 | ||
299 | r = make_filename(info, &fn); | |
23bbb0de MS |
300 | if (r < 0) |
301 | return log_error_errno(r, "Failed to determine coredump file name: %m"); | |
34c10968 | 302 | |
ae6c3cc0 LP |
303 | r = tempfn_random(fn, &tmp); |
304 | if (r < 0) | |
305 | return log_error_errno(r, "Failed to determine temporary file name: %m"); | |
803a3464 | 306 | |
d2e54fae | 307 | mkdir_p_label("/var/lib/systemd/coredump", 0755); |
803a3464 | 308 | |
34c10968 | 309 | fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
4a62c710 MS |
310 | if (fd < 0) |
311 | return log_error_errno(errno, "Failed to create coredump file %s: %m", tmp); | |
803a3464 | 312 | |
7430ec6a | 313 | r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max, false); |
84ee0960 | 314 | if (r == -EFBIG) { |
0dc5d23c | 315 | log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
316 | goto fail; |
317 | } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { | |
0dc5d23c | 318 | log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
319 | goto fail; |
320 | } else if (r < 0) { | |
da927ba9 | 321 | log_error_errno(r, "Failed to dump coredump to file: %m"); |
34c10968 LP |
322 | goto fail; |
323 | } | |
803a3464 | 324 | |
34c10968 | 325 | if (fstat(fd, &st) < 0) { |
56f64d95 | 326 | log_error_errno(errno, "Failed to fstat coredump %s: %m", tmp); |
34c10968 LP |
327 | goto fail; |
328 | } | |
329 | ||
7849c2ac | 330 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
56f64d95 | 331 | log_error_errno(errno, "Failed to seek on %s: %m", tmp); |
b59233e6 | 332 | goto fail; |
7849c2ac TA |
333 | } |
334 | ||
d89c8fdf | 335 | #if defined(HAVE_XZ) || defined(HAVE_LZ4) |
cfd652ed | 336 | /* If we will remove the coredump anyway, do not compress. */ |
34727273 | 337 | if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
8c9571d0 | 338 | && arg_compress) { |
cfd652ed | 339 | |
b59233e6 LP |
340 | _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
341 | _cleanup_close_ int fd_compressed = -1; | |
cfd652ed | 342 | |
d89c8fdf | 343 | fn_compressed = strappend(fn, COMPRESSED_EXT); |
b59233e6 | 344 | if (!fn_compressed) { |
d89c8fdf | 345 | log_oom(); |
cfd652ed ZJS |
346 | goto uncompressed; |
347 | } | |
348 | ||
ae6c3cc0 LP |
349 | r = tempfn_random(fn_compressed, &tmp_compressed); |
350 | if (r < 0) { | |
351 | log_error_errno(r, "Failed to determine temporary file name for %s: %m", fn_compressed); | |
b59233e6 | 352 | goto uncompressed; |
cfd652ed ZJS |
353 | } |
354 | ||
b59233e6 LP |
355 | fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
356 | if (fd_compressed < 0) { | |
56f64d95 | 357 | log_error_errno(errno, "Failed to create file %s: %m", tmp_compressed); |
b59233e6 | 358 | goto uncompressed; |
cfd652ed ZJS |
359 | } |
360 | ||
d89c8fdf | 361 | r = compress_stream(fd, fd_compressed, -1); |
b59233e6 | 362 | if (r < 0) { |
da927ba9 | 363 | log_error_errno(r, "Failed to compress %s: %m", tmp_compressed); |
b59233e6 LP |
364 | goto fail_compressed; |
365 | } | |
366 | ||
367 | r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid); | |
cfd652ed | 368 | if (r < 0) |
b59233e6 LP |
369 | goto fail_compressed; |
370 | ||
371 | /* OK, this worked, we can get rid of the uncompressed version now */ | |
372 | unlink_noerrno(tmp); | |
cfd652ed | 373 | |
b59233e6 LP |
374 | *ret_filename = fn_compressed; /* compressed */ |
375 | *ret_fd = fd; /* uncompressed */ | |
376 | *ret_size = st.st_size; /* uncompressed */ | |
cfd652ed | 377 | |
b59233e6 | 378 | fn_compressed = NULL; |
cfd652ed ZJS |
379 | fd = -1; |
380 | ||
381 | return 0; | |
382 | ||
b59233e6 LP |
383 | fail_compressed: |
384 | unlink_noerrno(tmp_compressed); | |
34c10968 | 385 | } |
cfd652ed ZJS |
386 | |
387 | uncompressed: | |
3b1a55e1 | 388 | #endif |
cfd652ed ZJS |
389 | r = fix_permissions(fd, tmp, fn, info, uid); |
390 | if (r < 0) | |
391 | goto fail; | |
34c10968 LP |
392 | |
393 | *ret_filename = fn; | |
394 | *ret_fd = fd; | |
395 | *ret_size = st.st_size; | |
396 | ||
397 | fn = NULL; | |
398 | fd = -1; | |
399 | ||
400 | return 0; | |
401 | ||
402 | fail: | |
403 | unlink_noerrno(tmp); | |
404 | return r; | |
405 | } | |
406 | ||
407 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
408 | _cleanup_free_ char *field = NULL; | |
409 | ssize_t n; | |
410 | ||
8d4e028f | 411 | assert(fd >= 0); |
34c10968 LP |
412 | assert(ret); |
413 | assert(ret_size); | |
414 | ||
4a62c710 MS |
415 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
416 | return log_warning_errno(errno, "Failed to seek: %m"); | |
803a3464 | 417 | |
34c10968 LP |
418 | field = malloc(9 + size); |
419 | if (!field) { | |
cfd652ed | 420 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
421 | return -ENOMEM; |
422 | } | |
423 | ||
424 | memcpy(field, "COREDUMP=", 9); | |
425 | ||
426 | n = read(fd, field + 9, size); | |
23bbb0de MS |
427 | if (n < 0) |
428 | return log_error_errno((int) n, "Failed to read core data: %m"); | |
34c10968 LP |
429 | if ((size_t) n < size) { |
430 | log_error("Core data too short."); | |
431 | return -EIO; | |
432 | } | |
433 | ||
434 | *ret = field; | |
435 | *ret_size = size + 9; | |
436 | ||
437 | field = NULL; | |
438 | ||
439 | return 0; | |
440 | } | |
803a3464 | 441 | |
3f132692 JF |
442 | /* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines: |
443 | * 0:/dev/pts/23 | |
444 | * pos: 0 | |
445 | * flags: 0100002 | |
446 | * | |
447 | * 1:/dev/pts/23 | |
448 | * pos: 0 | |
449 | * flags: 0100002 | |
450 | * | |
451 | * 2:/dev/pts/23 | |
452 | * pos: 0 | |
453 | * flags: 0100002 | |
454 | * EOF | |
455 | */ | |
456 | static int compose_open_fds(pid_t pid, char **open_fds) { | |
4d84bc2f LP |
457 | _cleanup_closedir_ DIR *proc_fd_dir = NULL; |
458 | _cleanup_close_ int proc_fdinfo_fd = -1; | |
459 | _cleanup_free_ char *buffer = NULL; | |
3f132692 | 460 | _cleanup_fclose_ FILE *stream = NULL; |
59059b4a | 461 | const char *fddelim = "", *path; |
3f132692 | 462 | struct dirent *dent = NULL; |
4d84bc2f | 463 | size_t size = 0; |
3f132692 JF |
464 | int r = 0; |
465 | ||
466 | assert(pid >= 0); | |
467 | assert(open_fds != NULL); | |
468 | ||
59059b4a | 469 | path = procfs_file_alloca(pid, "fd"); |
3f132692 | 470 | proc_fd_dir = opendir(path); |
59059b4a ZJS |
471 | if (!proc_fd_dir) |
472 | return -errno; | |
3f132692 | 473 | |
4d84bc2f | 474 | proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH); |
59059b4a ZJS |
475 | if (proc_fdinfo_fd < 0) |
476 | return -errno; | |
3f132692 | 477 | |
4d84bc2f | 478 | stream = open_memstream(&buffer, &size); |
3f132692 JF |
479 | if (!stream) |
480 | return -ENOMEM; | |
481 | ||
4d84bc2f | 482 | FOREACH_DIRENT(dent, proc_fd_dir, return -errno) { |
3f132692 | 483 | _cleanup_fclose_ FILE *fdinfo = NULL; |
4d84bc2f | 484 | _cleanup_free_ char *fdname = NULL; |
59059b4a | 485 | char line[LINE_MAX]; |
4d84bc2f | 486 | int fd; |
3f132692 | 487 | |
59059b4a | 488 | r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname); |
3f132692 JF |
489 | if (r < 0) |
490 | return r; | |
491 | ||
492 | fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname); | |
493 | fddelim = "\n"; | |
494 | ||
495 | /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */ | |
59059b4a ZJS |
496 | fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY); |
497 | if (fd < 0) | |
3f132692 JF |
498 | continue; |
499 | ||
59059b4a ZJS |
500 | fdinfo = fdopen(fd, "re"); |
501 | if (fdinfo == NULL) { | |
502 | close(fd); | |
3f132692 | 503 | continue; |
59059b4a | 504 | } |
3f132692 | 505 | |
4d84bc2f LP |
506 | FOREACH_LINE(line, fdinfo, break) { |
507 | fputs(line, stream); | |
508 | if (!endswith(line, "\n")) | |
509 | fputc('\n', stream); | |
510 | } | |
3f132692 JF |
511 | } |
512 | ||
4d84bc2f LP |
513 | errno = 0; |
514 | fclose(stream); | |
515 | stream = NULL; | |
516 | ||
517 | if (errno != 0) | |
518 | return -errno; | |
519 | ||
520 | *open_fds = buffer; | |
521 | buffer = NULL; | |
522 | ||
3f132692 JF |
523 | return 0; |
524 | } | |
525 | ||
f5e04665 | 526 | int main(int argc, char* argv[]) { |
34c10968 | 527 | |
8c8549db LP |
528 | /* The small core field we allocate on the stack, to keep things simple */ |
529 | char | |
530 | *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
531 | *core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL, | |
532 | *core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL, | |
533 | *core_slice = NULL; | |
534 | ||
535 | /* The larger ones we allocate on the heap */ | |
536 | _cleanup_free_ char | |
537 | *core_timestamp = NULL, *core_message = NULL, *coredump_data = NULL, *core_owner_uid = NULL, | |
538 | *core_open_fds = NULL, *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL, | |
539 | *core_proc_cgroup = NULL, *core_environ = NULL; | |
540 | ||
541 | _cleanup_free_ char *exe = NULL, *comm = NULL, *filename = NULL; | |
1eef15b1 | 542 | const char *info[_INFO_LEN]; |
34c10968 LP |
543 | |
544 | _cleanup_close_ int coredump_fd = -1; | |
545 | ||
3f132692 | 546 | struct iovec iovec[26]; |
34c10968 | 547 | off_t coredump_size; |
f5e04665 | 548 | int r, j = 0; |
a035f819 | 549 | uid_t uid, owner_uid; |
fee80f69 | 550 | gid_t gid; |
a035f819 | 551 | pid_t pid; |
34c10968 | 552 | char *t; |
3f132692 | 553 | const char *p; |
f5e04665 | 554 | |
34c10968 | 555 | /* Make sure we never enter a loop */ |
803a3464 | 556 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 | 557 | |
34c10968 LP |
558 | /* First, log to a safe place, since we don't know what |
559 | * crashed and it might be journald which we'd rather not log | |
560 | * to then. */ | |
561 | log_set_target(LOG_TARGET_KMSG); | |
34c10968 | 562 | log_open(); |
803a3464 | 563 | |
1eef15b1 ZJS |
564 | if (argc < INFO_COMM + 1) { |
565 | log_error("Not enough arguments passed from kernel (%d, expected %d).", | |
566 | argc - 1, INFO_COMM + 1 - 1); | |
f5e04665 LP |
567 | r = -EINVAL; |
568 | goto finish; | |
569 | } | |
570 | ||
34c10968 LP |
571 | /* Ignore all parse errors */ |
572 | parse_config(); | |
8c9571d0 LP |
573 | |
574 | log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); | |
575 | log_debug("Selected compression %s.", yes_no(arg_compress)); | |
34c10968 | 576 | |
1eef15b1 | 577 | r = parse_uid(argv[INFO_UID + 1], &uid); |
f5e04665 | 578 | if (r < 0) { |
34c10968 LP |
579 | log_error("Failed to parse UID."); |
580 | goto finish; | |
581 | } | |
803a3464 | 582 | |
1eef15b1 | 583 | r = parse_pid(argv[INFO_PID + 1], &pid); |
34c10968 | 584 | if (r < 0) { |
f5e04665 | 585 | log_error("Failed to parse PID."); |
f5e04665 LP |
586 | goto finish; |
587 | } | |
588 | ||
1eef15b1 | 589 | r = parse_gid(argv[INFO_GID + 1], &gid); |
34c10968 LP |
590 | if (r < 0) { |
591 | log_error("Failed to parse GID."); | |
592 | goto finish; | |
593 | } | |
594 | ||
1eef15b1 | 595 | if (get_process_comm(pid, &comm) < 0) { |
3f85ef0f | 596 | log_warning("Failed to get COMM, falling back to the command line."); |
1eef15b1 ZJS |
597 | comm = strv_join(argv + INFO_COMM + 1, " "); |
598 | } | |
599 | ||
600 | if (get_process_exe(pid, &exe) < 0) | |
601 | log_warning("Failed to get EXE."); | |
602 | ||
603 | info[INFO_PID] = argv[INFO_PID + 1]; | |
604 | info[INFO_UID] = argv[INFO_UID + 1]; | |
605 | info[INFO_GID] = argv[INFO_GID + 1]; | |
606 | info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; | |
607 | info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; | |
608 | info[INFO_COMM] = comm; | |
609 | info[INFO_EXE] = exe; | |
610 | ||
ba1261bc | 611 | if (cg_pid_get_unit(pid, &t) >= 0) { |
803a3464 LP |
612 | |
613 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
8c8549db | 614 | free(t); |
803a3464 | 615 | |
34c10968 LP |
616 | /* If we are journald, we cut things short, |
617 | * don't write to the journal, but still | |
618 | * create a coredump. */ | |
619 | ||
620 | if (arg_storage != COREDUMP_STORAGE_NONE) | |
621 | arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
622 | ||
9fe13294 | 623 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 LP |
624 | if (r < 0) |
625 | goto finish; | |
626 | ||
9fe13294 | 627 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
628 | if (r < 0) |
629 | goto finish; | |
630 | ||
9fe13294 | 631 | log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); |
803a3464 LP |
632 | goto finish; |
633 | } | |
634 | ||
63c372cb | 635 | core_unit = strjoina("COREDUMP_UNIT=", t); |
8c8549db LP |
636 | free(t); |
637 | ||
638 | } else if (cg_pid_get_user_unit(pid, &t) >= 0) { | |
63c372cb | 639 | core_unit = strjoina("COREDUMP_USER_UNIT=", t); |
8c8549db LP |
640 | free(t); |
641 | } | |
803a3464 | 642 | |
f9045468 MT |
643 | if (core_unit) |
644 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
645 | ||
34c10968 LP |
646 | /* OK, now we know it's not the journal, hence we can make use |
647 | * of it now. */ | |
803a3464 LP |
648 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
649 | log_open(); | |
650 | ||
63c372cb | 651 | core_pid = strjoina("COREDUMP_PID=", info[INFO_PID]); |
8c8549db | 652 | IOVEC_SET_STRING(iovec[j++], core_pid); |
f5e04665 | 653 | |
63c372cb | 654 | core_uid = strjoina("COREDUMP_UID=", info[INFO_UID]); |
8c8549db | 655 | IOVEC_SET_STRING(iovec[j++], core_uid); |
f5e04665 | 656 | |
63c372cb | 657 | core_gid = strjoina("COREDUMP_GID=", info[INFO_GID]); |
8c8549db | 658 | IOVEC_SET_STRING(iovec[j++], core_gid); |
f5e04665 | 659 | |
63c372cb | 660 | core_signal = strjoina("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); |
8c8549db | 661 | IOVEC_SET_STRING(iovec[j++], core_signal); |
f5e04665 | 662 | |
f5e04665 | 663 | if (sd_pid_get_session(pid, &t) >= 0) { |
63c372cb | 664 | core_session = strjoina("COREDUMP_SESSION=", t); |
f5e04665 LP |
665 | free(t); |
666 | ||
8c8549db | 667 | IOVEC_SET_STRING(iovec[j++], core_session); |
f5e04665 LP |
668 | } |
669 | ||
a035f819 | 670 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
7de80bfe KZ |
671 | r = asprintf(&core_owner_uid, |
672 | "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); | |
673 | if (r > 0) | |
a035f819 LP |
674 | IOVEC_SET_STRING(iovec[j++], core_owner_uid); |
675 | } | |
676 | ||
677 | if (sd_pid_get_slice(pid, &t) >= 0) { | |
63c372cb | 678 | core_slice = strjoina("COREDUMP_SLICE=", t); |
a035f819 LP |
679 | free(t); |
680 | ||
8c8549db | 681 | IOVEC_SET_STRING(iovec[j++], core_slice); |
a035f819 LP |
682 | } |
683 | ||
1eef15b1 | 684 | if (comm) { |
63c372cb | 685 | core_comm = strjoina("COREDUMP_COMM=", comm); |
8c8549db | 686 | IOVEC_SET_STRING(iovec[j++], core_comm); |
1eef15b1 ZJS |
687 | } |
688 | ||
689 | if (exe) { | |
63c372cb | 690 | core_exe = strjoina("COREDUMP_EXE=", exe); |
8c8549db | 691 | IOVEC_SET_STRING(iovec[j++], core_exe); |
f5e04665 LP |
692 | } |
693 | ||
9bdbc2e2 | 694 | if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
63c372cb | 695 | core_cmdline = strjoina("COREDUMP_CMDLINE=", t); |
f5e04665 LP |
696 | free(t); |
697 | ||
8c8549db | 698 | IOVEC_SET_STRING(iovec[j++], core_cmdline); |
f5e04665 LP |
699 | } |
700 | ||
a035f819 | 701 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
63c372cb | 702 | core_cgroup = strjoina("COREDUMP_CGROUP=", t); |
a035f819 LP |
703 | free(t); |
704 | ||
8c8549db | 705 | IOVEC_SET_STRING(iovec[j++], core_cgroup); |
a035f819 LP |
706 | } |
707 | ||
3f132692 JF |
708 | if (compose_open_fds(pid, &t) >= 0) { |
709 | core_open_fds = strappend("COREDUMP_OPEN_FDS=", t); | |
710 | free(t); | |
711 | ||
712 | if (core_open_fds) | |
713 | IOVEC_SET_STRING(iovec[j++], core_open_fds); | |
714 | } | |
715 | ||
716 | p = procfs_file_alloca(pid, "status"); | |
717 | if (read_full_file(p, &t, NULL) >= 0) { | |
718 | core_proc_status = strappend("COREDUMP_PROC_STATUS=", t); | |
719 | free(t); | |
720 | ||
721 | if (core_proc_status) | |
722 | IOVEC_SET_STRING(iovec[j++], core_proc_status); | |
723 | } | |
724 | ||
725 | p = procfs_file_alloca(pid, "maps"); | |
726 | if (read_full_file(p, &t, NULL) >= 0) { | |
727 | core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t); | |
728 | free(t); | |
729 | ||
730 | if (core_proc_maps) | |
731 | IOVEC_SET_STRING(iovec[j++], core_proc_maps); | |
732 | } | |
733 | ||
734 | p = procfs_file_alloca(pid, "limits"); | |
735 | if (read_full_file(p, &t, NULL) >= 0) { | |
736 | core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t); | |
737 | free(t); | |
738 | ||
739 | if (core_proc_limits) | |
740 | IOVEC_SET_STRING(iovec[j++], core_proc_limits); | |
741 | } | |
742 | ||
743 | p = procfs_file_alloca(pid, "cgroup"); | |
744 | if (read_full_file(p, &t, NULL) >=0) { | |
745 | core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t); | |
746 | free(t); | |
747 | ||
748 | if (core_proc_cgroup) | |
749 | IOVEC_SET_STRING(iovec[j++], core_proc_cgroup); | |
750 | } | |
751 | ||
752 | if (get_process_cwd(pid, &t) >= 0) { | |
63c372cb | 753 | core_cwd = strjoina("COREDUMP_CWD=", t); |
3f132692 JF |
754 | free(t); |
755 | ||
8c8549db | 756 | IOVEC_SET_STRING(iovec[j++], core_cwd); |
3f132692 JF |
757 | } |
758 | ||
759 | if (get_process_root(pid, &t) >= 0) { | |
63c372cb | 760 | core_root = strjoina("COREDUMP_ROOT=", t); |
3f132692 JF |
761 | free(t); |
762 | ||
8c8549db | 763 | IOVEC_SET_STRING(iovec[j++], core_root); |
3f132692 JF |
764 | } |
765 | ||
766 | if (get_process_environ(pid, &t) >= 0) { | |
767 | core_environ = strappend("COREDUMP_ENVIRON=", t); | |
768 | free(t); | |
769 | ||
770 | if (core_environ) | |
771 | IOVEC_SET_STRING(iovec[j++], core_environ); | |
772 | } | |
773 | ||
1eef15b1 | 774 | core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); |
f5e04665 LP |
775 | if (core_timestamp) |
776 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
777 | ||
778 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
779 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
780 | ||
0dc5d23c LP |
781 | /* Vacuum before we write anything again */ |
782 | coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
783 | ||
34c10968 | 784 | /* Always stream the coredump to disk, if that's possible */ |
9fe13294 | 785 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 | 786 | if (r < 0) |
2424a475 ZJS |
787 | /* skip whole core dumping part */ |
788 | goto log; | |
34c10968 LP |
789 | |
790 | /* If we don't want to keep the coredump on disk, remove it | |
8d4e028f LP |
791 | * now, as later on we will lack the privileges for |
792 | * it. However, we keep the fd to it, so that we can still | |
793 | * process it and log it. */ | |
9fe13294 | 794 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
795 | if (r < 0) |
796 | goto finish; | |
9fe13294 ZJS |
797 | if (r == 0) { |
798 | const char *coredump_filename; | |
799 | ||
63c372cb | 800 | coredump_filename = strjoina("COREDUMP_FILENAME=", filename); |
9fe13294 ZJS |
801 | IOVEC_SET_STRING(iovec[j++], coredump_filename); |
802 | } | |
34c10968 | 803 | |
0dc5d23c LP |
804 | /* Vacuum again, but exclude the coredump we just created */ |
805 | coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use); | |
806 | ||
fee80f69 LP |
807 | /* Now, let's drop privileges to become the user who owns the |
808 | * segfaulted process and allocate the coredump memory under | |
b26c631a KP |
809 | * the user's uid. This also ensures that the credentials |
810 | * journald will see are the ones of the coredumping user, | |
f11943c5 LP |
811 | * thus making sure the user gets access to the core |
812 | * dump. Let's also get rid of all capabilities, if we run as | |
813 | * root, we won't need them anymore. */ | |
814 | r = drop_privileges(uid, gid, 0); | |
815 | if (r < 0) { | |
816 | log_error_errno(r, "Failed to drop privileges: %m"); | |
fee80f69 LP |
817 | goto finish; |
818 | } | |
819 | ||
8d4e028f LP |
820 | #ifdef HAVE_ELFUTILS |
821 | /* Try to get a strack trace if we can */ | |
822 | if (coredump_size <= arg_process_size_max) { | |
823 | _cleanup_free_ char *stacktrace = NULL; | |
824 | ||
825 | r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); | |
826 | if (r >= 0) | |
1eef15b1 | 827 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); |
4d229b31 UTL |
828 | else if (r == -EINVAL) |
829 | log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno())); | |
8d4e028f | 830 | else |
da927ba9 | 831 | log_warning_errno(r, "Failed to generate stack trace: %m"); |
8d4e028f LP |
832 | } |
833 | ||
834 | if (!core_message) | |
835 | #endif | |
2424a475 | 836 | log: |
1eef15b1 | 837 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); |
8d4e028f LP |
838 | if (core_message) |
839 | IOVEC_SET_STRING(iovec[j++], core_message); | |
840 | ||
34c10968 LP |
841 | /* Optionally store the entire coredump in the journal */ |
842 | if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && | |
843 | coredump_size <= (off_t) arg_journal_size_max) { | |
844 | size_t sz; | |
fee80f69 | 845 | |
34c10968 | 846 | /* Store the coredump itself in the journal */ |
fee80f69 | 847 | |
34c10968 LP |
848 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
849 | if (r >= 0) { | |
850 | iovec[j].iov_base = coredump_data; | |
851 | iovec[j].iov_len = sz; | |
852 | j++; | |
ca0ceb6f | 853 | } |
fee80f69 LP |
854 | } |
855 | ||
f5e04665 LP |
856 | r = sd_journal_sendv(iovec, j); |
857 | if (r < 0) | |
da927ba9 | 858 | log_error_errno(r, "Failed to log coredump: %m"); |
f5e04665 LP |
859 | |
860 | finish: | |
f5e04665 LP |
861 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
862 | } |