1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
6 #include <sys/statvfs.h>
11 #include "sd-daemon.h"
12 #include "sd-journal.h"
14 #include "sd-messages.h"
17 #include "alloc-util.h"
18 #include "bus-error.h"
19 #include "capability-util.h"
20 #include "cgroup-util.h"
22 #include "conf-parser.h"
24 #include "coredump-util.h"
25 #include "coredump-vacuum.h"
26 #include "dirent-util.h"
33 #include "journal-importer.h"
34 #include "journal-send.h"
37 #include "main-func.h"
38 #include "memory-util.h"
39 #include "mkdir-label.h"
40 #include "parse-util.h"
41 #include "process-util.h"
42 #include "signal-util.h"
43 #include "socket-util.h"
45 #include "stat-util.h"
46 #include "string-table.h"
47 #include "string-util.h"
49 #include "sync-util.h"
50 #include "tmpfile-util.h"
51 #include "uid-alloc-range.h"
52 #include "user-util.h"
54 /* The maximum size up to which we process coredumps. We use 1G on 32bit systems, and 32G on 64bit systems */
55 #if __SIZEOF_POINTER__ == 4
56 #define PROCESS_SIZE_MAX ((uint64_t) (1LLU*1024LLU*1024LLU*1024LLU))
57 #elif __SIZEOF_POINTER__ == 8
58 #define PROCESS_SIZE_MAX ((uint64_t) (32LLU*1024LLU*1024LLU*1024LLU))
60 #error "Unexpected pointer size"
63 /* The maximum size up to which we leave the coredump around on disk */
64 #define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX
66 /* The maximum size up to which we store the coredump in the journal */
67 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
68 #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU))
70 /* oss-fuzz limits memory usage. */
71 #define JOURNAL_SIZE_MAX ((size_t) (10LU*1024LU*1024LU))
74 /* When checking for available memory and setting lower limits, don't
75 * go below 4MB for writing core files to storage. */
76 #define PROCESS_SIZE_MIN (4U*1024U*1024U)
78 /* Make sure to not make this larger than the maximum journal entry
79 * size. See DATA_SIZE_MAX in journal-importer.h. */
80 assert_cc(JOURNAL_SIZE_MAX
<= DATA_SIZE_MAX
);
83 /* We use these as array indexes for our process metadata cache.
85 * The first indices of the cache stores the same metadata as the ones passed by
86 * the kernel via argv[], ie the strings array passed by the kernel according to
87 * our pattern defined in /proc/sys/kernel/core_pattern (see man:core(5)). */
89 META_ARGV_PID
, /* %P: as seen in the initial pid namespace */
90 META_ARGV_UID
, /* %u: as seen in the initial user namespace */
91 META_ARGV_GID
, /* %g: as seen in the initial user namespace */
92 META_ARGV_SIGNAL
, /* %s: number of signal causing dump */
93 META_ARGV_TIMESTAMP
, /* %t: time of dump, expressed as seconds since the Epoch (we expand this to µs granularity) */
94 META_ARGV_RLIMIT
, /* %c: core file size soft resource limit */
95 META_ARGV_HOSTNAME
, /* %h: hostname */
98 /* The following indexes are cached for a couple of special fields we use (and
99 * thereby need to be retrieved quickly) for naming coredump files, and attaching
100 * xattrs. Unlike the previous ones they are retrieved from the runtime
103 META_COMM
= _META_ARGV_MAX
,
106 /* The rest are similar to the previous ones except that we won't fail if one of
107 * them is missing. */
109 META_EXE
= _META_MANDATORY_MAX
,
115 static const char * const meta_field_names
[_META_MAX
] = {
116 [META_ARGV_PID
] = "COREDUMP_PID=",
117 [META_ARGV_UID
] = "COREDUMP_UID=",
118 [META_ARGV_GID
] = "COREDUMP_GID=",
119 [META_ARGV_SIGNAL
] = "COREDUMP_SIGNAL=",
120 [META_ARGV_TIMESTAMP
] = "COREDUMP_TIMESTAMP=",
121 [META_ARGV_RLIMIT
] = "COREDUMP_RLIMIT=",
122 [META_ARGV_HOSTNAME
] = "COREDUMP_HOSTNAME=",
123 [META_COMM
] = "COREDUMP_COMM=",
124 [META_EXE
] = "COREDUMP_EXE=",
125 [META_UNIT
] = "COREDUMP_UNIT=",
126 [META_PROC_AUXV
] = "COREDUMP_PROC_AUXV=",
129 typedef struct Context
{
130 const char *meta
[_META_MAX
];
131 size_t meta_size
[_META_MAX
];
137 typedef enum CoredumpStorage
{
138 COREDUMP_STORAGE_NONE
,
139 COREDUMP_STORAGE_EXTERNAL
,
140 COREDUMP_STORAGE_JOURNAL
,
141 _COREDUMP_STORAGE_MAX
,
142 _COREDUMP_STORAGE_INVALID
= -EINVAL
,
145 static const char* const coredump_storage_table
[_COREDUMP_STORAGE_MAX
] = {
146 [COREDUMP_STORAGE_NONE
] = "none",
147 [COREDUMP_STORAGE_EXTERNAL
] = "external",
148 [COREDUMP_STORAGE_JOURNAL
] = "journal",
151 DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage
, CoredumpStorage
);
152 static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage
, coredump_storage
, CoredumpStorage
, "Failed to parse storage setting");
154 static CoredumpStorage arg_storage
= COREDUMP_STORAGE_EXTERNAL
;
155 static bool arg_compress
= true;
156 static uint64_t arg_process_size_max
= PROCESS_SIZE_MAX
;
157 static uint64_t arg_external_size_max
= EXTERNAL_SIZE_MAX
;
158 static uint64_t arg_journal_size_max
= JOURNAL_SIZE_MAX
;
159 static uint64_t arg_keep_free
= UINT64_MAX
;
160 static uint64_t arg_max_use
= UINT64_MAX
;
162 static int parse_config(void) {
163 static const ConfigTableItem items
[] = {
164 { "Coredump", "Storage", config_parse_coredump_storage
, 0, &arg_storage
},
165 { "Coredump", "Compress", config_parse_bool
, 0, &arg_compress
},
166 { "Coredump", "ProcessSizeMax", config_parse_iec_uint64
, 0, &arg_process_size_max
},
167 { "Coredump", "ExternalSizeMax", config_parse_iec_uint64_infinity
, 0, &arg_external_size_max
},
168 { "Coredump", "JournalSizeMax", config_parse_iec_size
, 0, &arg_journal_size_max
},
169 { "Coredump", "KeepFree", config_parse_iec_uint64
, 0, &arg_keep_free
},
170 { "Coredump", "MaxUse", config_parse_iec_uint64
, 0, &arg_max_use
},
174 return config_parse_config_file("coredump.conf", "Coredump\0",
175 config_item_table_lookup
, items
,
176 CONFIG_PARSE_WARN
, NULL
);
179 static uint64_t storage_size_max(void) {
180 if (arg_storage
== COREDUMP_STORAGE_EXTERNAL
)
181 return arg_external_size_max
;
182 if (arg_storage
== COREDUMP_STORAGE_JOURNAL
)
183 return arg_journal_size_max
;
184 assert(arg_storage
== COREDUMP_STORAGE_NONE
);
188 static int fix_acl(int fd
, uid_t uid
, bool allow_user
) {
190 assert(uid_is_valid(uid
));
195 /* We don't allow users to read coredumps if the uid or capabilities were changed. */
199 if (uid_is_system(uid
) || uid_is_dynamic(uid
) || uid
== UID_NOBODY
)
202 /* Make sure normal users can read (but not write or delete) their own coredumps */
203 r
= fd_add_uid_acl_permission(fd
, uid
, ACL_READ
);
205 return log_error_errno(r
, "Failed to adjust ACL of the coredump: %m");
211 static int fix_xattr(int fd
, const Context
*context
) {
213 static const char * const xattrs
[_META_MAX
] = {
214 [META_ARGV_PID
] = "user.coredump.pid",
215 [META_ARGV_UID
] = "user.coredump.uid",
216 [META_ARGV_GID
] = "user.coredump.gid",
217 [META_ARGV_SIGNAL
] = "user.coredump.signal",
218 [META_ARGV_TIMESTAMP
] = "user.coredump.timestamp",
219 [META_ARGV_RLIMIT
] = "user.coredump.rlimit",
220 [META_ARGV_HOSTNAME
] = "user.coredump.hostname",
221 [META_COMM
] = "user.coredump.comm",
222 [META_EXE
] = "user.coredump.exe",
229 /* Attach some metadata to coredumps via extended
230 * attributes. Just because we can. */
232 for (unsigned i
= 0; i
< _META_MAX
; i
++) {
235 if (isempty(context
->meta
[i
]) || !xattrs
[i
])
238 k
= fsetxattr(fd
, xattrs
[i
], context
->meta
[i
], strlen(context
->meta
[i
]), XATTR_CREATE
);
246 #define filename_escape(s) xescape((s), "./ ")
248 static const char *coredump_tmpfile_name(const char *s
) {
249 return s
?: "(unnamed temporary file)";
252 static int fix_permissions(
254 const char *filename
,
256 const Context
*context
,
266 /* Ignore errors on these */
267 (void) fchmod(fd
, 0640);
268 (void) fix_acl(fd
, uid
, allow_user
);
269 (void) fix_xattr(fd
, context
);
273 return log_error_errno(r
, "Failed to sync coredump %s: %m", coredump_tmpfile_name(filename
));
275 r
= link_tmpfile(fd
, filename
, target
, /* replace= */ false);
277 return log_error_errno(r
, "Failed to move coredump %s into place: %m", target
);
282 static int maybe_remove_external_coredump(const char *filename
, uint64_t size
) {
284 /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */
286 if (arg_storage
== COREDUMP_STORAGE_EXTERNAL
&&
287 size
<= arg_external_size_max
)
293 if (unlink(filename
) < 0 && errno
!= ENOENT
)
294 return log_error_errno(errno
, "Failed to unlink %s: %m", filename
);
299 static int make_filename(const Context
*context
, char **ret
) {
300 _cleanup_free_
char *c
= NULL
, *u
= NULL
, *p
= NULL
, *t
= NULL
;
301 sd_id128_t boot
= {};
306 c
= filename_escape(context
->meta
[META_COMM
]);
310 u
= filename_escape(context
->meta
[META_ARGV_UID
]);
314 r
= sd_id128_get_boot(&boot
);
318 p
= filename_escape(context
->meta
[META_ARGV_PID
]);
322 t
= filename_escape(context
->meta
[META_ARGV_TIMESTAMP
]);
327 "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR
".%s.%s",
330 SD_ID128_FORMAT_VAL(boot
),
338 static int grant_user_access(int core_fd
, const Context
*context
) {
340 uid_t uid
= UID_INVALID
, euid
= UID_INVALID
;
341 uid_t gid
= GID_INVALID
, egid
= GID_INVALID
;
344 assert(core_fd
>= 0);
347 if (!context
->meta
[META_PROC_AUXV
])
348 return log_warning_errno(SYNTHETIC_ERRNO(ENODATA
), "No auxv data, not adjusting permissions.");
350 uint8_t elf
[EI_NIDENT
];
352 if (pread(core_fd
, &elf
, sizeof(elf
), 0) != sizeof(elf
))
353 return log_warning_errno(errno_or_else(EIO
),
354 "Failed to pread from coredump fd: %s", STRERROR_OR_EOF(errno
));
356 if (elf
[EI_MAG0
] != ELFMAG0
||
357 elf
[EI_MAG1
] != ELFMAG1
||
358 elf
[EI_MAG2
] != ELFMAG2
||
359 elf
[EI_MAG3
] != ELFMAG3
||
360 elf
[EI_VERSION
] != EV_CURRENT
)
361 return log_info_errno(SYNTHETIC_ERRNO(EUCLEAN
),
362 "Core file does not have ELF header, not adjusting permissions.");
363 if (!IN_SET(elf
[EI_CLASS
], ELFCLASS32
, ELFCLASS64
) ||
364 !IN_SET(elf
[EI_DATA
], ELFDATA2LSB
, ELFDATA2MSB
))
365 return log_info_errno(SYNTHETIC_ERRNO(EUCLEAN
),
366 "Core file has strange ELF class, not adjusting permissions.");
368 if ((elf
[EI_DATA
] == ELFDATA2LSB
) != (__BYTE_ORDER
== __LITTLE_ENDIAN
))
369 return log_info_errno(SYNTHETIC_ERRNO(EUCLEAN
),
370 "Core file has non-native endianness, not adjusting permissions.");
372 r
= parse_auxv(LOG_WARNING
,
373 /* elf_class= */ elf
[EI_CLASS
],
374 context
->meta
[META_PROC_AUXV
],
375 context
->meta_size
[META_PROC_AUXV
],
376 &at_secure
, &uid
, &euid
, &gid
, &egid
);
380 /* We allow access if we got all the data and at_secure is not set and
381 * the uid/gid matches euid/egid. */
384 uid
!= UID_INVALID
&& euid
!= UID_INVALID
&& uid
== euid
&&
385 gid
!= GID_INVALID
&& egid
!= GID_INVALID
&& gid
== egid
;
386 log_debug("Will %s access (uid="UID_FMT
" euid="UID_FMT
" gid="GID_FMT
" egid="GID_FMT
" at_secure=%s)",
387 ret
? "permit" : "restrict",
388 uid
, euid
, gid
, egid
, yes_no(at_secure
));
392 static int save_external_coredump(
393 const Context
*context
,
399 uint64_t *ret_compressed_size
,
400 bool *ret_truncated
) {
402 _cleanup_(unlink_and_freep
) char *tmp
= NULL
;
403 _cleanup_free_
char *fn
= NULL
;
404 _cleanup_close_
int fd
= -EBADF
;
405 uint64_t rlimit
, process_limit
, max_size
;
406 bool truncated
, storage_on_tmpfs
;
412 assert(ret_filename
);
416 assert(ret_compressed_size
);
417 assert(ret_truncated
);
419 r
= parse_uid(context
->meta
[META_ARGV_UID
], &uid
);
421 return log_error_errno(r
, "Failed to parse UID: %m");
423 r
= safe_atou64(context
->meta
[META_ARGV_RLIMIT
], &rlimit
);
425 return log_error_errno(r
, "Failed to parse resource limit '%s': %m",
426 context
->meta
[META_ARGV_RLIMIT
]);
427 if (rlimit
< page_size())
428 /* Is coredumping disabled? Then don't bother saving/processing the
429 * coredump. Anything below PAGE_SIZE cannot give a readable coredump
430 * (the kernel uses ELF_EXEC_PAGESIZE which is not easily accessible, but
431 * is usually the same as PAGE_SIZE. */
432 return log_info_errno(SYNTHETIC_ERRNO(EBADSLT
),
433 "Resource limits disable core dumping for process %s (%s).",
434 context
->meta
[META_ARGV_PID
], context
->meta
[META_COMM
]);
436 process_limit
= MAX(arg_process_size_max
, storage_size_max());
437 if (process_limit
== 0)
438 return log_debug_errno(SYNTHETIC_ERRNO(EBADSLT
),
439 "Limits for coredump processing and storage are both 0, not dumping core.");
441 /* Never store more than the process configured, or than we actually shall keep or process */
442 max_size
= MIN(rlimit
, process_limit
);
444 r
= make_filename(context
, &fn
);
446 return log_error_errno(r
, "Failed to determine coredump file name: %m");
448 (void) mkdir_parents_label(fn
, 0755);
450 fd
= open_tmpfile_linkable(fn
, O_RDWR
|O_CLOEXEC
, &tmp
);
452 return log_error_errno(fd
, "Failed to create temporary file for coredump %s: %m", fn
);
454 /* If storage is on tmpfs, the kernel oomd might kill us if there's MemoryMax set on
455 * the service or the slice it belongs to. This is common on low-resources systems,
456 * to avoid crashing processes to take away too many system resources.
457 * Check the cgroup settings, and set max_size to a bit less than half of the
458 * available memory left to the process.
459 * Then, attempt to write the core file uncompressed first - if the write gets
460 * interrupted, we know we won't be able to write it all, so instead compress what
461 * was written so far, delete the uncompressed truncated core, and then continue
462 * compressing from STDIN. Given the compressed core cannot be larger than the
463 * uncompressed one, and 1KB for metadata is accounted for in the calculation, we
464 * should be able to at least store the full compressed core file. */
466 storage_on_tmpfs
= fd_is_temporary_fs(fd
) > 0;
467 if (storage_on_tmpfs
&& arg_compress
) {
468 _cleanup_(sd_bus_flush_close_unrefp
) sd_bus
*bus
= NULL
;
469 uint64_t cgroup_limit
= UINT64_MAX
;
472 /* If we can't get the cgroup limit, just ignore it, but don't fail,
473 * try anyway with the config settings. */
474 r
= sd_bus_default_system(&bus
);
476 log_info_errno(r
, "Failed to connect to system bus, skipping MemoryAvailable check: %m");
478 _cleanup_(sd_bus_error_free
) sd_bus_error error
= SD_BUS_ERROR_NULL
;
480 r
= sd_bus_get_property_trivial(
482 "org.freedesktop.systemd1",
483 "/org/freedesktop/systemd1/unit/self",
484 "org.freedesktop.systemd1.Service",
490 "Failed to query MemoryAvailable for current unit, "
491 "falling back to static config settings: %s",
492 bus_error_message(&error
, r
));
495 max_size
= MIN(cgroup_limit
, max_size
);
496 max_size
= LESS_BY(max_size
, 1024U) / 2; /* Account for 1KB metadata overhead for compressing */
497 max_size
= MAX(PROCESS_SIZE_MIN
, max_size
); /* Impose a lower minimum */
499 /* tmpfs might get full quickly, so check the available space too.
500 * But don't worry about errors here, failing to access the storage
501 * location will be better logged when writing to it. */
502 if (fstatvfs(fd
, &sv
) >= 0)
503 max_size
= MIN((uint64_t)sv
.f_frsize
* (uint64_t)sv
.f_bfree
, max_size
);
505 log_debug("Limiting core file size to %" PRIu64
" bytes due to cgroup memory limits.", max_size
);
508 r
= copy_bytes(input_fd
, fd
, max_size
, 0);
510 return log_error_errno(r
, "Cannot store coredump of %s (%s): %m",
511 context
->meta
[META_ARGV_PID
], context
->meta
[META_COMM
]);
514 bool allow_user
= grant_user_access(fd
, context
) > 0;
518 _cleanup_(unlink_and_freep
) char *tmp_compressed
= NULL
;
519 _cleanup_free_
char *fn_compressed
= NULL
;
520 _cleanup_close_
int fd_compressed
= -EBADF
;
521 uint64_t uncompressed_size
= 0;
523 if (lseek(fd
, 0, SEEK_SET
) == (off_t
) -1)
524 return log_error_errno(errno
, "Failed to seek on coredump %s: %m", fn
);
526 fn_compressed
= strjoin(fn
, default_compression_extension());
530 fd_compressed
= open_tmpfile_linkable(fn_compressed
, O_RDWR
|O_CLOEXEC
, &tmp_compressed
);
531 if (fd_compressed
< 0)
532 return log_error_errno(fd_compressed
, "Failed to create temporary file for coredump %s: %m", fn_compressed
);
534 r
= compress_stream(fd
, fd_compressed
, max_size
, &uncompressed_size
);
536 return log_error_errno(r
, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed
));
538 if (truncated
&& storage_on_tmpfs
) {
539 uint64_t partial_uncompressed_size
= 0;
541 /* Uncompressed write was truncated and we are writing to tmpfs: delete
542 * the uncompressed core, and compress the remaining part from STDIN. */
544 tmp
= unlink_and_free(tmp
);
547 r
= compress_stream(input_fd
, fd_compressed
, max_size
, &partial_uncompressed_size
);
549 return log_error_errno(r
, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed
));
550 uncompressed_size
+= partial_uncompressed_size
;
553 r
= fix_permissions(fd_compressed
, tmp_compressed
, fn_compressed
, context
, uid
, allow_user
);
557 if (fstat(fd_compressed
, &st
) < 0)
558 return log_error_errno(errno
,
559 "Failed to fstat core file %s: %m",
560 coredump_tmpfile_name(tmp_compressed
));
562 *ret_filename
= TAKE_PTR(fn_compressed
); /* compressed */
563 *ret_node_fd
= TAKE_FD(fd_compressed
); /* compressed */
564 *ret_compressed_size
= (uint64_t) st
.st_size
; /* compressed */
565 *ret_data_fd
= TAKE_FD(fd
);
566 *ret_size
= uncompressed_size
;
567 *ret_truncated
= truncated
;
568 tmp_compressed
= mfree(tmp_compressed
);
576 LOG_MESSAGE("Core file was truncated to %"PRIu64
" bytes.", max_size
),
577 "SIZE_LIMIT=%"PRIu64
, max_size
,
578 "MESSAGE_ID=" SD_MESSAGE_TRUNCATED_CORE_STR
);
580 r
= fix_permissions(fd
, tmp
, fn
, context
, uid
, allow_user
);
582 return log_error_errno(r
, "Failed to fix permissions and finalize coredump %s into %s: %m", coredump_tmpfile_name(tmp
), fn
);
584 if (fstat(fd
, &st
) < 0)
585 return log_error_errno(errno
, "Failed to fstat core file %s: %m", coredump_tmpfile_name(tmp
));
587 if (lseek(fd
, 0, SEEK_SET
) == (off_t
) -1)
588 return log_error_errno(errno
, "Failed to seek on coredump %s: %m", fn
);
590 *ret_filename
= TAKE_PTR(fn
);
591 *ret_data_fd
= TAKE_FD(fd
);
592 *ret_size
= (uint64_t) st
.st_size
;
593 *ret_truncated
= truncated
;
598 static int allocate_journal_field(int fd
, size_t size
, char **ret
, size_t *ret_size
) {
599 _cleanup_free_
char *field
= NULL
;
606 if (lseek(fd
, 0, SEEK_SET
) == (off_t
) -1)
607 return log_warning_errno(errno
, "Failed to seek: %m");
609 field
= malloc(9 + size
);
611 log_warning("Failed to allocate memory for coredump, coredump will not be stored.");
615 memcpy(field
, "COREDUMP=", 9);
617 n
= read(fd
, field
+ 9, size
);
619 return log_error_errno((int) n
, "Failed to read core data: %m");
620 if ((size_t) n
< size
)
621 return log_error_errno(SYNTHETIC_ERRNO(EIO
),
622 "Core data too short.");
624 *ret
= TAKE_PTR(field
);
625 *ret_size
= size
+ 9;
630 /* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines:
644 static int compose_open_fds(pid_t pid
, char **open_fds
) {
645 _cleanup_closedir_
DIR *proc_fd_dir
= NULL
;
646 _cleanup_close_
int proc_fdinfo_fd
= -EBADF
;
647 _cleanup_free_
char *buffer
= NULL
;
648 _cleanup_fclose_
FILE *stream
= NULL
;
649 const char *fddelim
= "", *path
;
654 assert(open_fds
!= NULL
);
656 path
= procfs_file_alloca(pid
, "fd");
657 proc_fd_dir
= opendir(path
);
661 proc_fdinfo_fd
= openat(dirfd(proc_fd_dir
), "../fdinfo", O_DIRECTORY
|O_NOFOLLOW
|O_CLOEXEC
|O_PATH
);
662 if (proc_fdinfo_fd
< 0)
665 stream
= open_memstream_unlocked(&buffer
, &size
);
669 FOREACH_DIRENT(de
, proc_fd_dir
, return -errno
) {
670 _cleanup_fclose_
FILE *fdinfo
= NULL
;
671 _cleanup_free_
char *fdname
= NULL
;
672 _cleanup_close_
int fd
= -EBADF
;
674 r
= readlinkat_malloc(dirfd(proc_fd_dir
), de
->d_name
, &fdname
);
678 fprintf(stream
, "%s%s:%s\n", fddelim
, de
->d_name
, fdname
);
681 /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */
682 fd
= openat(proc_fdinfo_fd
, de
->d_name
, O_NOFOLLOW
|O_CLOEXEC
|O_RDONLY
);
686 fdinfo
= take_fdopen(&fd
, "r");
691 _cleanup_free_
char *line
= NULL
;
693 r
= read_line(fdinfo
, LONG_LINE_MAX
, &line
);
705 stream
= safe_fclose(stream
);
710 *open_fds
= TAKE_PTR(buffer
);
715 static int get_process_ns(pid_t pid
, const char *namespace, ino_t
*ns
) {
718 _cleanup_close_
int proc_ns_dir_fd
= -EBADF
;
720 p
= procfs_file_alloca(pid
, "ns");
722 proc_ns_dir_fd
= open(p
, O_DIRECTORY
| O_CLOEXEC
| O_RDONLY
);
723 if (proc_ns_dir_fd
< 0)
726 if (fstatat(proc_ns_dir_fd
, namespace, &stbuf
, /* flags */0) < 0)
733 static int get_mount_namespace_leader(pid_t pid
, pid_t
*ret
) {
737 r
= get_process_ns(pid
, "mnt", &proc_mntns
);
745 r
= get_process_ppid(pid
, &ppid
);
746 if (r
== -EADDRNOTAVAIL
) /* Reached the top (i.e. typically PID 1, but could also be a process
747 * whose parent is not in our pidns) */
752 r
= get_process_ns(ppid
, "mnt", &parent_mntns
);
756 if (proc_mntns
!= parent_mntns
) {
765 /* Returns 1 if the parent was found.
766 * Returns 0 if there is not a process we can call the pid's
767 * container parent (the pid's process isn't 'containerized').
768 * Returns a negative number on errors.
770 static int get_process_container_parent_cmdline(pid_t pid
, char** cmdline
) {
772 const char *proc_root_path
;
773 struct stat root_stat
, proc_root_stat
;
776 /* To compare inodes of / and /proc/[pid]/root */
777 if (stat("/", &root_stat
) < 0)
780 proc_root_path
= procfs_file_alloca(pid
, "root");
781 if (stat(proc_root_path
, &proc_root_stat
) < 0)
784 /* The process uses system root. */
785 if (stat_inode_same(&proc_root_stat
, &root_stat
)) {
790 r
= get_mount_namespace_leader(pid
, &container_pid
);
794 r
= get_process_cmdline(container_pid
, SIZE_MAX
, PROCESS_CMDLINE_QUOTE_POSIX
, cmdline
);
801 static int change_uid_gid(const Context
*context
) {
806 r
= parse_uid(context
->meta
[META_ARGV_UID
], &uid
);
810 if (uid_is_system(uid
)) {
811 const char *user
= "systemd-coredump";
813 r
= get_user_creds(&user
, &uid
, &gid
, NULL
, NULL
, 0);
815 log_warning_errno(r
, "Cannot resolve %s user. Proceeding to dump core as root: %m", user
);
819 r
= parse_gid(context
->meta
[META_ARGV_GID
], &gid
);
824 return drop_privileges(uid
, gid
, 0);
827 static int submit_coredump(
828 const Context
*context
,
829 struct iovec_wrapper
*iovw
,
832 _cleanup_(json_variant_unrefp
) JsonVariant
*json_metadata
= NULL
;
833 _cleanup_close_
int coredump_fd
= -EBADF
, coredump_node_fd
= -EBADF
;
834 _cleanup_free_
char *filename
= NULL
, *coredump_data
= NULL
;
835 _cleanup_free_
char *stacktrace
= NULL
;
837 const char *module_name
;
838 uint64_t coredump_size
= UINT64_MAX
, coredump_compressed_size
= UINT64_MAX
;
839 bool truncated
= false;
840 JsonVariant
*module_json
;
845 assert(input_fd
>= 0);
847 /* Vacuum before we write anything again */
848 (void) coredump_vacuum(-1, arg_keep_free
, arg_max_use
);
850 /* Always stream the coredump to disk, if that's possible */
851 r
= save_external_coredump(context
, input_fd
,
852 &filename
, &coredump_node_fd
, &coredump_fd
,
853 &coredump_size
, &coredump_compressed_size
, &truncated
);
855 /* Skip whole core dumping part */
858 /* If we don't want to keep the coredump on disk, remove it now, as later on we
859 * will lack the privileges for it. However, we keep the fd to it, so that we can
860 * still process it and log it. */
861 r
= maybe_remove_external_coredump(filename
, coredump_node_fd
>= 0 ? coredump_compressed_size
: coredump_size
);
865 (void) iovw_put_string_field(iovw
, "COREDUMP_FILENAME=", filename
);
866 else if (arg_storage
== COREDUMP_STORAGE_EXTERNAL
)
867 log_info("The core will not be stored: size %"PRIu64
" is greater than %"PRIu64
" (the configured maximum)",
868 coredump_node_fd
>= 0 ? coredump_compressed_size
: coredump_size
, arg_external_size_max
);
870 /* Vacuum again, but exclude the coredump we just created */
871 (void) coredump_vacuum(coredump_node_fd
>= 0 ? coredump_node_fd
: coredump_fd
, arg_keep_free
, arg_max_use
);
873 /* Now, let's drop privileges to become the user who owns the segfaulted process
874 * and allocate the coredump memory under the user's uid. This also ensures that
875 * the credentials journald will see are the ones of the coredumping user, thus
876 * making sure the user gets access to the core dump. Let's also get rid of all
877 * capabilities, if we run as root, we won't need them anymore. */
878 r
= change_uid_gid(context
);
880 return log_error_errno(r
, "Failed to drop privileges: %m");
882 /* Try to get a stack trace if we can */
883 if (coredump_size
> arg_process_size_max
)
884 log_debug("Not generating stack trace: core size %"PRIu64
" is greater "
885 "than %"PRIu64
" (the configured maximum)",
886 coredump_size
, arg_process_size_max
);
887 else if (coredump_fd
>= 0) {
888 bool skip
= startswith(context
->meta
[META_COMM
], "systemd-coredum"); /* COMM is 16 bytes usually */
890 (void) parse_elf_object(coredump_fd
,
891 context
->meta
[META_EXE
],
892 /* fork_disable_dump= */ skip
, /* avoid loops */
898 core_message
= strjoina("Process ", context
->meta
[META_ARGV_PID
],
899 " (", context
->meta
[META_COMM
], ") of user ",
900 context
->meta
[META_ARGV_UID
], " dumped core.",
901 context
->is_journald
&& filename
? "\nCoredump diverted to " : NULL
,
902 context
->is_journald
&& filename
? filename
: NULL
);
904 core_message
= strjoina(core_message
, stacktrace
? "\n\n" : NULL
, stacktrace
);
906 if (context
->is_journald
)
907 /* We might not be able to log to the journal, so let's always print the message to another
908 * log target. The target was set previously to something safe. */
909 log_dispatch(LOG_ERR
, 0, core_message
);
911 (void) iovw_put_string_field(iovw
, "MESSAGE=", core_message
);
914 (void) iovw_put_string_field(iovw
, "COREDUMP_TRUNCATED=", "1");
916 /* If we managed to parse any ELF metadata (build-id, ELF package meta),
917 * attach it as journal metadata. */
919 _cleanup_free_
char *formatted_json
= NULL
;
921 r
= json_variant_format(json_metadata
, 0, &formatted_json
);
923 return log_error_errno(r
, "Failed to format JSON package metadata: %m");
925 (void) iovw_put_string_field(iovw
, "COREDUMP_PACKAGE_JSON=", formatted_json
);
928 /* In the unlikely scenario that context->meta[META_EXE] is not available,
929 * let's avoid guessing the module name and skip the loop. */
930 if (context
->meta
[META_EXE
])
931 JSON_VARIANT_OBJECT_FOREACH(module_name
, module_json
, json_metadata
) {
934 /* We only add structured fields for the 'main' ELF module, and only if we can identify it. */
935 if (!path_equal_filename(module_name
, context
->meta
[META_EXE
]))
938 t
= json_variant_by_key(module_json
, "name");
940 (void) iovw_put_string_field(iovw
, "COREDUMP_PACKAGE_NAME=", json_variant_string(t
));
942 t
= json_variant_by_key(module_json
, "version");
944 (void) iovw_put_string_field(iovw
, "COREDUMP_PACKAGE_VERSION=", json_variant_string(t
));
947 /* Optionally store the entire coredump in the journal */
948 if (arg_storage
== COREDUMP_STORAGE_JOURNAL
&& coredump_fd
>= 0) {
949 if (coredump_size
<= arg_journal_size_max
) {
952 /* Store the coredump itself in the journal */
954 r
= allocate_journal_field(coredump_fd
, (size_t) coredump_size
, &coredump_data
, &sz
);
956 if (iovw_put(iovw
, coredump_data
, sz
) >= 0)
957 TAKE_PTR(coredump_data
);
959 log_warning_errno(r
, "Failed to attach the core to the journal entry: %m");
961 log_info("The core will not be stored: size %"PRIu64
" is greater than %"PRIu64
" (the configured maximum)",
962 coredump_size
, arg_journal_size_max
);
965 /* If journald is coredumping, we have to be careful that we don't deadlock when trying to write the
966 * coredump to the journal, so we put the journal socket in nonblocking mode before trying to write
967 * the coredump to the socket. */
969 if (context
->is_journald
) {
970 r
= journal_fd_nonblock(true);
972 return log_error_errno(r
, "Failed to make journal socket non-blocking: %m");
975 r
= sd_journal_sendv(iovw
->iovec
, iovw
->count
);
977 if (context
->is_journald
) {
980 k
= journal_fd_nonblock(false);
982 return log_error_errno(k
, "Failed to make journal socket blocking: %m");
985 if (r
== -EAGAIN
&& context
->is_journald
)
986 log_warning_errno(r
, "Failed to log journal coredump, ignoring: %m");
988 return log_error_errno(r
, "Failed to log coredump: %m");
993 static int save_context(Context
*context
, const struct iovec_wrapper
*iovw
) {
999 assert(iovw
->count
>= _META_ARGV_MAX
);
1001 /* The context does not allocate any memory on its own */
1003 for (size_t n
= 0; n
< iovw
->count
; n
++) {
1004 struct iovec
*iovec
= iovw
->iovec
+ n
;
1006 for (size_t i
= 0; i
< ELEMENTSOF(meta_field_names
); i
++) {
1007 /* Note that these strings are NUL terminated, because we made sure that a
1008 * trailing NUL byte is in the buffer, though not included in the iov_len
1009 * count (see process_socket() and gather_pid_metadata_*()) */
1010 assert(((char*) iovec
->iov_base
)[iovec
->iov_len
] == 0);
1012 const char *p
= startswith(iovec
->iov_base
, meta_field_names
[i
]);
1014 context
->meta
[i
] = p
;
1015 context
->meta_size
[i
] = iovec
->iov_len
- strlen(meta_field_names
[i
]);
1021 if (!context
->meta
[META_ARGV_PID
])
1022 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1023 "Failed to find the PID of crashing process");
1025 r
= parse_pid(context
->meta
[META_ARGV_PID
], &context
->pid
);
1027 return log_error_errno(r
, "Failed to parse PID \"%s\": %m", context
->meta
[META_ARGV_PID
]);
1029 unit
= context
->meta
[META_UNIT
];
1030 context
->is_pid1
= streq(context
->meta
[META_ARGV_PID
], "1") || streq_ptr(unit
, SPECIAL_INIT_SCOPE
);
1031 context
->is_journald
= streq_ptr(unit
, SPECIAL_JOURNALD_SERVICE
);
1036 static int process_socket(int fd
) {
1037 _cleanup_close_
int input_fd
= -EBADF
;
1038 Context context
= {};
1039 struct iovec_wrapper iovw
= {};
1047 log_debug("Processing coredump received on stdin...");
1050 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int))) control
;
1051 struct msghdr mh
= {
1052 .msg_control
= &control
,
1053 .msg_controllen
= sizeof(control
),
1059 l
= next_datagram_size_fd(fd
);
1061 r
= log_error_errno(l
, "Failed to determine datagram size to read: %m");
1066 iovec
.iov_base
= malloc(l
+ 1);
1067 if (!iovec
.iov_base
) {
1072 mh
.msg_iov
= &iovec
;
1074 n
= recvmsg_safe(fd
, &mh
, MSG_CMSG_CLOEXEC
);
1076 free(iovec
.iov_base
);
1077 r
= log_error_errno(n
, "Failed to receive datagram: %m");
1081 /* The final zero-length datagram carries the file descriptor and tells us
1082 * that we're done. */
1084 struct cmsghdr
*found
;
1086 free(iovec
.iov_base
);
1088 found
= cmsg_find(&mh
, SOL_SOCKET
, SCM_RIGHTS
, CMSG_LEN(sizeof(int)));
1090 cmsg_close_all(&mh
);
1091 r
= log_error_errno(SYNTHETIC_ERRNO(EBADMSG
),
1092 "Coredump file descriptor missing.");
1096 assert(input_fd
< 0);
1097 input_fd
= *CMSG_TYPED_DATA(found
, int);
1100 cmsg_close_all(&mh
);
1102 /* Add trailing NUL byte, in case these are strings */
1103 ((char*) iovec
.iov_base
)[n
] = 0;
1104 iovec
.iov_len
= (size_t) n
;
1106 r
= iovw_put(&iovw
, iovec
.iov_base
, iovec
.iov_len
);
1111 /* Make sure we got all data we really need */
1112 assert(input_fd
>= 0);
1114 r
= save_context(&context
, &iovw
);
1118 /* Make sure we received at least all fields we need. */
1119 for (int i
= 0; i
< _META_MANDATORY_MAX
; i
++)
1120 if (!context
.meta
[i
]) {
1121 r
= log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1122 "A mandatory argument (%i) has not been sent, aborting.",
1127 r
= submit_coredump(&context
, &iovw
, input_fd
);
1130 iovw_free_contents(&iovw
, true);
1134 static int send_iovec(const struct iovec_wrapper
*iovw
, int input_fd
) {
1135 _cleanup_close_
int fd
= -EBADF
;
1139 assert(input_fd
>= 0);
1141 fd
= socket(AF_UNIX
, SOCK_SEQPACKET
|SOCK_CLOEXEC
, 0);
1143 return log_error_errno(errno
, "Failed to create coredump socket: %m");
1145 r
= connect_unix_path(fd
, AT_FDCWD
, "/run/systemd/coredump");
1147 return log_error_errno(r
, "Failed to connect to coredump service: %m");
1149 for (size_t i
= 0; i
< iovw
->count
; i
++) {
1150 struct msghdr mh
= {
1151 .msg_iov
= iovw
->iovec
+ i
,
1154 struct iovec copy
[2];
1157 if (sendmsg(fd
, &mh
, MSG_NOSIGNAL
) >= 0)
1160 if (errno
== EMSGSIZE
&& mh
.msg_iov
[0].iov_len
> 0) {
1161 /* This field didn't fit? That's a pity. Given that this is
1162 * just metadata, let's truncate the field at half, and try
1163 * again. We append three dots, in order to show that this is
1166 if (mh
.msg_iov
!= copy
) {
1167 /* We don't want to modify the caller's iovec, hence
1168 * let's create our own array, consisting of two new
1169 * iovecs, where the first is a (truncated) copy of
1170 * what we want to send, and the second one contains
1171 * the trailing dots. */
1172 copy
[0] = iovw
->iovec
[i
];
1173 copy
[1] = IOVEC_MAKE(((char[]){'.', '.', '.'}), 3);
1179 copy
[0].iov_len
/= 2; /* halve it, and try again */
1183 return log_error_errno(errno
, "Failed to send coredump datagram: %m");
1187 r
= send_one_fd(fd
, input_fd
, 0);
1189 return log_error_errno(r
, "Failed to send coredump fd: %m");
1194 static int gather_pid_metadata_from_argv(
1195 struct iovec_wrapper
*iovw
,
1197 int argc
, char **argv
) {
1199 _cleanup_free_
char *free_timestamp
= NULL
;
1203 /* We gather all metadata that were passed via argv[] into an array of iovecs that
1204 * we'll forward to the socket unit */
1206 if (argc
< _META_ARGV_MAX
)
1207 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1208 "Not enough arguments passed by the kernel (%i, expected %i).",
1209 argc
, _META_ARGV_MAX
);
1211 for (int i
= 0; i
< _META_ARGV_MAX
; i
++) {
1217 case META_ARGV_TIMESTAMP
:
1218 /* The journal fields contain the timestamp padded with six
1219 * zeroes, so that the kernel-supplied 1s granularity timestamps
1220 * becomes 1µs granularity, i.e. the granularity systemd usually
1222 t
= free_timestamp
= strjoin(argv
[i
], "000000");
1227 case META_ARGV_SIGNAL
:
1228 /* For signal, record its pretty name too */
1229 if (safe_atoi(argv
[i
], &signo
) >= 0 && SIGNAL_VALID(signo
))
1230 (void) iovw_put_string_field(iovw
, "COREDUMP_SIGNAL_NAME=SIG",
1231 signal_to_string(signo
));
1238 r
= iovw_put_string_field(iovw
, meta_field_names
[i
], t
);
1243 /* Cache some of the process metadata we collected so far and that we'll need to
1245 return save_context(context
, iovw
);
1248 static int gather_pid_metadata(struct iovec_wrapper
*iovw
, Context
*context
) {
1256 /* Note that if we fail on oom later on, we do not roll-back changes to the iovec
1257 * structure. (It remains valid, with the first iovec fields initialized.) */
1261 /* The following is mandatory */
1262 r
= get_process_comm(pid
, &t
);
1264 return log_error_errno(r
, "Failed to get COMM: %m");
1266 r
= iovw_put_string_field_free(iovw
, "COREDUMP_COMM=", t
);
1270 /* The following are optional, but we use them if present. */
1271 r
= get_process_exe(pid
, &t
);
1273 r
= iovw_put_string_field_free(iovw
, "COREDUMP_EXE=", t
);
1275 log_warning_errno(r
, "Failed to get EXE, ignoring: %m");
1277 if (cg_pid_get_unit(pid
, &t
) >= 0)
1278 (void) iovw_put_string_field_free(iovw
, "COREDUMP_UNIT=", t
);
1280 if (cg_pid_get_user_unit(pid
, &t
) >= 0)
1281 (void) iovw_put_string_field_free(iovw
, "COREDUMP_USER_UNIT=", t
);
1283 if (sd_pid_get_session(pid
, &t
) >= 0)
1284 (void) iovw_put_string_field_free(iovw
, "COREDUMP_SESSION=", t
);
1286 if (sd_pid_get_owner_uid(pid
, &owner_uid
) >= 0) {
1287 r
= asprintf(&t
, UID_FMT
, owner_uid
);
1289 (void) iovw_put_string_field_free(iovw
, "COREDUMP_OWNER_UID=", t
);
1292 if (sd_pid_get_slice(pid
, &t
) >= 0)
1293 (void) iovw_put_string_field_free(iovw
, "COREDUMP_SLICE=", t
);
1295 if (get_process_cmdline(pid
, SIZE_MAX
, PROCESS_CMDLINE_QUOTE_POSIX
, &t
) >= 0)
1296 (void) iovw_put_string_field_free(iovw
, "COREDUMP_CMDLINE=", t
);
1298 if (cg_pid_get_path_shifted(pid
, NULL
, &t
) >= 0)
1299 (void) iovw_put_string_field_free(iovw
, "COREDUMP_CGROUP=", t
);
1301 if (compose_open_fds(pid
, &t
) >= 0)
1302 (void) iovw_put_string_field_free(iovw
, "COREDUMP_OPEN_FDS=", t
);
1304 p
= procfs_file_alloca(pid
, "status");
1305 if (read_full_virtual_file(p
, &t
, NULL
) >= 0)
1306 (void) iovw_put_string_field_free(iovw
, "COREDUMP_PROC_STATUS=", t
);
1308 p
= procfs_file_alloca(pid
, "maps");
1309 if (read_full_virtual_file(p
, &t
, NULL
) >= 0)
1310 (void) iovw_put_string_field_free(iovw
, "COREDUMP_PROC_MAPS=", t
);
1312 p
= procfs_file_alloca(pid
, "limits");
1313 if (read_full_virtual_file(p
, &t
, NULL
) >= 0)
1314 (void) iovw_put_string_field_free(iovw
, "COREDUMP_PROC_LIMITS=", t
);
1316 p
= procfs_file_alloca(pid
, "cgroup");
1317 if (read_full_virtual_file(p
, &t
, NULL
) >= 0)
1318 (void) iovw_put_string_field_free(iovw
, "COREDUMP_PROC_CGROUP=", t
);
1320 p
= procfs_file_alloca(pid
, "mountinfo");
1321 if (read_full_virtual_file(p
, &t
, NULL
) >= 0)
1322 (void) iovw_put_string_field_free(iovw
, "COREDUMP_PROC_MOUNTINFO=", t
);
1324 /* We attach /proc/auxv here. ELF coredumps also contain a note for this (NT_AUXV), see elf(5). */
1325 p
= procfs_file_alloca(pid
, "auxv");
1326 if (read_full_virtual_file(p
, &t
, &size
) >= 0) {
1327 char *buf
= malloc(strlen("COREDUMP_PROC_AUXV=") + size
+ 1);
1329 /* Add a dummy terminator to make save_context() happy. */
1330 *((uint8_t*) mempcpy(stpcpy(buf
, "COREDUMP_PROC_AUXV="), t
, size
)) = '\0';
1331 (void) iovw_consume(iovw
, buf
, size
+ strlen("COREDUMP_PROC_AUXV="));
1337 if (get_process_cwd(pid
, &t
) >= 0)
1338 (void) iovw_put_string_field_free(iovw
, "COREDUMP_CWD=", t
);
1340 if (get_process_root(pid
, &t
) >= 0) {
1341 bool proc_self_root_is_slash
;
1343 proc_self_root_is_slash
= strcmp(t
, "/") == 0;
1345 (void) iovw_put_string_field_free(iovw
, "COREDUMP_ROOT=", t
);
1347 /* If the process' root is "/", then there is a chance it has
1348 * mounted own root and hence being containerized. */
1349 if (proc_self_root_is_slash
&& get_process_container_parent_cmdline(pid
, &t
) > 0)
1350 (void) iovw_put_string_field_free(iovw
, "COREDUMP_CONTAINER_CMDLINE=", t
);
1353 if (get_process_environ(pid
, &t
) >= 0)
1354 (void) iovw_put_string_field_free(iovw
, "COREDUMP_ENVIRON=", t
);
1356 /* we successfully acquired all metadata */
1357 return save_context(context
, iovw
);
1360 static int process_kernel(int argc
, char* argv
[]) {
1361 Context context
= {};
1362 struct iovec_wrapper
*iovw
;
1365 /* When we're invoked by the kernel, stdout/stderr are closed which is dangerous because the fds
1366 * could get reallocated. To avoid hard to debug issues, let's instead bind stdout/stderr to
1368 r
= rearrange_stdio(STDIN_FILENO
, -EBADF
, -EBADF
);
1370 return log_error_errno(r
, "Failed to connect stdout/stderr to /dev/null: %m");
1372 log_debug("Processing coredump received from the kernel...");
1378 (void) iovw_put_string_field(iovw
, "MESSAGE_ID=", SD_MESSAGE_COREDUMP_STR
);
1379 (void) iovw_put_string_field(iovw
, "PRIORITY=", STRINGIFY(LOG_CRIT
));
1381 /* Collect all process metadata passed by the kernel through argv[] */
1382 r
= gather_pid_metadata_from_argv(iovw
, &context
, argc
- 1, argv
+ 1);
1386 /* Collect the rest of the process metadata retrieved from the runtime */
1387 r
= gather_pid_metadata(iovw
, &context
);
1391 if (!context
.is_journald
)
1392 /* OK, now we know it's not the journal, hence we can make use of it now. */
1393 log_set_target_and_open(LOG_TARGET_JOURNAL_OR_KMSG
);
1395 /* If this is PID 1 disable coredump collection, we'll unlikely be able to process
1398 * FIXME: maybe we should disable coredumps generation from the beginning and
1399 * re-enable it only when we know it's either safe (ie we're not running OOM) or
1400 * it's not pid1 ? */
1401 if (context
.is_pid1
) {
1402 log_notice("Due to PID 1 having crashed coredump collection will now be turned off.");
1403 disable_coredumps();
1406 if (context
.is_journald
|| context
.is_pid1
)
1407 r
= submit_coredump(&context
, iovw
, STDIN_FILENO
);
1409 r
= send_iovec(iovw
, STDIN_FILENO
);
1412 iovw
= iovw_free_free(iovw
);
1416 static int process_backtrace(int argc
, char *argv
[]) {
1417 Context context
= {};
1418 struct iovec_wrapper
*iovw
;
1421 _cleanup_(journal_importer_cleanup
) JournalImporter importer
= JOURNAL_IMPORTER_INIT(STDIN_FILENO
);
1423 log_debug("Processing backtrace on stdin...");
1429 (void) iovw_put_string_field(iovw
, "MESSAGE_ID=", SD_MESSAGE_BACKTRACE_STR
);
1430 (void) iovw_put_string_field(iovw
, "PRIORITY=", STRINGIFY(LOG_CRIT
));
1432 /* Collect all process metadata from argv[] by making sure to skip the
1433 * '--backtrace' option */
1434 r
= gather_pid_metadata_from_argv(iovw
, &context
, argc
- 2, argv
+ 2);
1438 /* Collect the rest of the process metadata retrieved from the runtime */
1439 r
= gather_pid_metadata(iovw
, &context
);
1444 r
= journal_importer_process_data(&importer
);
1446 log_error_errno(r
, "Failed to parse journal entry on stdin: %m");
1449 if (r
== 1 || /* complete entry */
1450 journal_importer_eof(&importer
)) /* end of data */
1454 if (journal_importer_eof(&importer
)) {
1455 log_warning("Did not receive a full journal entry on stdin, ignoring message sent by reporter");
1457 message
= strjoina("Process ", context
.meta
[META_ARGV_PID
],
1458 " (", context
.meta
[META_COMM
], ")"
1459 " of user ", context
.meta
[META_ARGV_UID
],
1460 " failed with ", context
.meta
[META_ARGV_SIGNAL
]);
1462 r
= iovw_put_string_field(iovw
, "MESSAGE=", message
);
1466 /* The imported iovecs are not supposed to be freed by us so let's store
1467 * them at the end of the array so we can skip them while freeing the
1469 for (size_t i
= 0; i
< importer
.iovw
.count
; i
++) {
1470 struct iovec
*iovec
= importer
.iovw
.iovec
+ i
;
1472 iovw_put(iovw
, iovec
->iov_base
, iovec
->iov_len
);
1476 r
= sd_journal_sendv(iovw
->iovec
, iovw
->count
);
1478 log_error_errno(r
, "Failed to log backtrace: %m");
1481 iovw
->count
-= importer
.iovw
.count
;
1482 iovw
= iovw_free_free(iovw
);
1486 static int run(int argc
, char *argv
[]) {
1489 /* First, log to a safe place, since we don't know what crashed and it might
1490 * be journald which we'd rather not log to then. */
1492 log_set_target_and_open(LOG_TARGET_KMSG
);
1494 /* Make sure we never enter a loop */
1495 (void) prctl(PR_SET_DUMPABLE
, 0);
1497 /* Ignore all parse errors */
1498 (void) parse_config();
1500 log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage
));
1501 log_debug("Selected compression %s.", yes_no(arg_compress
));
1503 r
= sd_listen_fds(false);
1505 return log_error_errno(r
, "Failed to determine the number of file descriptors: %m");
1507 /* If we got an fd passed, we are running in coredumpd mode. Otherwise we
1508 * are invoked from the kernel as coredump handler. */
1510 if (streq_ptr(argv
[1], "--backtrace"))
1511 return process_backtrace(argc
, argv
);
1513 return process_kernel(argc
, argv
);
1515 return process_socket(SD_LISTEN_FDS_START
);
1517 return log_error_errno(SYNTHETIC_ERRNO(EINVAL
),
1518 "Received unexpected number of file descriptors.");
1521 DEFINE_MAIN_FUNCTION(run
);