| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <sys/prctl.h> |
| #include <sys/statvfs.h> |
| #include <sys/xattr.h> |
| #include <unistd.h> |
| |
| #if HAVE_ELFUTILS |
| #include <dwarf.h> |
| #include <elfutils/libdwfl.h> |
| #endif |
| |
| #include "sd-daemon.h" |
| #include "sd-journal.h" |
| #include "sd-login.h" |
| #include "sd-messages.h" |
| |
| #include "acl-util.h" |
| #include "alloc-util.h" |
| #include "bus-error.h" |
| #include "capability-util.h" |
| #include "cgroup-util.h" |
| #include "compress.h" |
| #include "conf-parser.h" |
| #include "copy.h" |
| #include "coredump-vacuum.h" |
| #include "dirent-util.h" |
| #include "escape.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "fs-util.h" |
| #include "io-util.h" |
| #include "journal-importer.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "main-func.h" |
| #include "memory-util.h" |
| #include "mkdir.h" |
| #include "parse-util.h" |
| #include "process-util.h" |
| #include "signal-util.h" |
| #include "socket-util.h" |
| #include "special.h" |
| #include "stacktrace.h" |
| #include "stat-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "tmpfile-util.h" |
| #include "user-record.h" |
| #include "user-util.h" |
| |
| /* The maximum size up to which we process coredumps */ |
| #define PROCESS_SIZE_MAX ((uint64_t) (2LLU*1024LLU*1024LLU*1024LLU)) |
| |
| /* The maximum size up to which we leave the coredump around on disk */ |
| #define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX |
| |
| /* The maximum size up to which we store the coredump in the journal */ |
| #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) |
| #else |
| /* oss-fuzz limits memory usage. */ |
| #define JOURNAL_SIZE_MAX ((size_t) (10LU*1024LU*1024LU)) |
| #endif |
| |
| /* When checking for available memory and setting lower limits, don't |
| * go below 4MB for writing core files to storage. */ |
| #define PROCESS_SIZE_MIN (4U*1024U*1024U) |
| |
| /* Make sure to not make this larger than the maximum journal entry |
| * size. See DATA_SIZE_MAX in journal-importer.h. */ |
| assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); |
| |
| enum { |
| /* We use these as array indexes for our process metadata cache. |
| * |
| * The first indices of the cache stores the same metadata as the ones passed by |
| * the kernel via argv[], ie the strings array passed by the kernel according to |
| * our pattern defined in /proc/sys/kernel/core_pattern (see man:core(5)). */ |
| |
| META_ARGV_PID, /* %P: as seen in the initial pid namespace */ |
| META_ARGV_UID, /* %u: as seen in the initial user namespace */ |
| META_ARGV_GID, /* %g: as seen in the initial user namespace */ |
| META_ARGV_SIGNAL, /* %s: number of signal causing dump */ |
| META_ARGV_TIMESTAMP, /* %t: time of dump, expressed as seconds since the Epoch (we expand this to µs granularity) */ |
| META_ARGV_RLIMIT, /* %c: core file size soft resource limit */ |
| META_ARGV_HOSTNAME, /* %h: hostname */ |
| _META_ARGV_MAX, |
| |
| /* The following indexes are cached for a couple of special fields we use (and |
| * thereby need to be retrieved quickly) for naming coredump files, and attaching |
| * xattrs. Unlike the previous ones they are retrieved from the runtime |
| * environment. */ |
| |
| META_COMM = _META_ARGV_MAX, |
| _META_MANDATORY_MAX, |
| |
| /* The rest are similar to the previous ones except that we won't fail if one of |
| * them is missing. */ |
| |
| META_EXE = _META_MANDATORY_MAX, |
| META_UNIT, |
| _META_MAX |
| }; |
| |
| static const char * const meta_field_names[_META_MAX] = { |
| [META_ARGV_PID] = "COREDUMP_PID=", |
| [META_ARGV_UID] = "COREDUMP_UID=", |
| [META_ARGV_GID] = "COREDUMP_GID=", |
| [META_ARGV_SIGNAL] = "COREDUMP_SIGNAL=", |
| [META_ARGV_TIMESTAMP] = "COREDUMP_TIMESTAMP=", |
| [META_ARGV_RLIMIT] = "COREDUMP_RLIMIT=", |
| [META_ARGV_HOSTNAME] = "COREDUMP_HOSTNAME=", |
| [META_COMM] = "COREDUMP_COMM=", |
| [META_EXE] = "COREDUMP_EXE=", |
| [META_UNIT] = "COREDUMP_UNIT=", |
| }; |
| |
| typedef struct Context { |
| const char *meta[_META_MAX]; |
| pid_t pid; |
| bool is_pid1; |
| bool is_journald; |
| } Context; |
| |
| typedef enum CoredumpStorage { |
| COREDUMP_STORAGE_NONE, |
| COREDUMP_STORAGE_EXTERNAL, |
| COREDUMP_STORAGE_JOURNAL, |
| _COREDUMP_STORAGE_MAX, |
| _COREDUMP_STORAGE_INVALID = -EINVAL, |
| } CoredumpStorage; |
| |
| static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = { |
| [COREDUMP_STORAGE_NONE] = "none", |
| [COREDUMP_STORAGE_EXTERNAL] = "external", |
| [COREDUMP_STORAGE_JOURNAL] = "journal", |
| }; |
| |
| DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage); |
| static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting"); |
| |
| static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; |
| static bool arg_compress = true; |
| static uint64_t arg_process_size_max = PROCESS_SIZE_MAX; |
| static uint64_t arg_external_size_max = EXTERNAL_SIZE_MAX; |
| static uint64_t arg_journal_size_max = JOURNAL_SIZE_MAX; |
| static uint64_t arg_keep_free = UINT64_MAX; |
| static uint64_t arg_max_use = UINT64_MAX; |
| |
| static int parse_config(void) { |
| static const ConfigTableItem items[] = { |
| { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, |
| { "Coredump", "Compress", config_parse_bool, 0, &arg_compress }, |
| { "Coredump", "ProcessSizeMax", config_parse_iec_uint64, 0, &arg_process_size_max }, |
| { "Coredump", "ExternalSizeMax", config_parse_iec_uint64, 0, &arg_external_size_max }, |
| { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, |
| { "Coredump", "KeepFree", config_parse_iec_uint64, 0, &arg_keep_free }, |
| { "Coredump", "MaxUse", config_parse_iec_uint64, 0, &arg_max_use }, |
| {} |
| }; |
| |
| return config_parse_many_nulstr( |
| PKGSYSCONFDIR "/coredump.conf", |
| CONF_PATHS_NULSTR("systemd/coredump.conf.d"), |
| "Coredump\0", |
| config_item_table_lookup, items, |
| CONFIG_PARSE_WARN, |
| NULL, |
| NULL); |
| } |
| |
| static uint64_t storage_size_max(void) { |
| if (arg_storage == COREDUMP_STORAGE_EXTERNAL) |
| return arg_external_size_max; |
| if (arg_storage == COREDUMP_STORAGE_JOURNAL) |
| return arg_journal_size_max; |
| assert(arg_storage == COREDUMP_STORAGE_NONE); |
| return 0; |
| } |
| |
| static int fix_acl(int fd, uid_t uid) { |
| |
| #if HAVE_ACL |
| int r; |
| |
| assert(fd >= 0); |
| assert(uid_is_valid(uid)); |
| |
| if (uid_is_system(uid) || uid_is_dynamic(uid) || uid == UID_NOBODY) |
| return 0; |
| |
| /* Make sure normal users can read (but not write or delete) their own coredumps */ |
| r = fd_add_uid_acl_permission(fd, uid, ACL_READ); |
| if (r < 0) |
| return log_error_errno(r, "Failed to adjust ACL of the coredump: %m"); |
| #endif |
| |
| return 0; |
| } |
| |
| static int fix_xattr(int fd, const Context *context) { |
| |
| static const char * const xattrs[_META_MAX] = { |
| [META_ARGV_PID] = "user.coredump.pid", |
| [META_ARGV_UID] = "user.coredump.uid", |
| [META_ARGV_GID] = "user.coredump.gid", |
| [META_ARGV_SIGNAL] = "user.coredump.signal", |
| [META_ARGV_TIMESTAMP] = "user.coredump.timestamp", |
| [META_ARGV_RLIMIT] = "user.coredump.rlimit", |
| [META_ARGV_HOSTNAME] = "user.coredump.hostname", |
| [META_COMM] = "user.coredump.comm", |
| [META_EXE] = "user.coredump.exe", |
| }; |
| |
| int r = 0; |
| |
| assert(fd >= 0); |
| |
| /* Attach some metadata to coredumps via extended |
| * attributes. Just because we can. */ |
| |
| for (unsigned i = 0; i < _META_MAX; i++) { |
| int k; |
| |
| if (isempty(context->meta[i]) || !xattrs[i]) |
| continue; |
| |
| k = fsetxattr(fd, xattrs[i], context->meta[i], strlen(context->meta[i]), XATTR_CREATE); |
| if (k < 0 && r == 0) |
| r = -errno; |
| } |
| |
| return r; |
| } |
| |
| #define filename_escape(s) xescape((s), "./ ") |
| |
| static const char *coredump_tmpfile_name(const char *s) { |
| return s ? s : "(unnamed temporary file)"; |
| } |
| |
| static int fix_permissions( |
| int fd, |
| const char *filename, |
| const char *target, |
| const Context *context, |
| uid_t uid) { |
| |
| int r; |
| |
| assert(fd >= 0); |
| assert(target); |
| assert(context); |
| |
| /* Ignore errors on these */ |
| (void) fchmod(fd, 0640); |
| (void) fix_acl(fd, uid); |
| (void) fix_xattr(fd, context); |
| |
| if (fsync(fd) < 0) |
| return log_error_errno(errno, "Failed to sync coredump %s: %m", coredump_tmpfile_name(filename)); |
| |
| (void) fsync_directory_of_file(fd); |
| |
| r = link_tmpfile(fd, filename, target); |
| if (r < 0) |
| return log_error_errno(r, "Failed to move coredump %s into place: %m", target); |
| |
| return 0; |
| } |
| |
| static int maybe_remove_external_coredump(const char *filename, uint64_t size) { |
| |
| /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
| |
| if (arg_storage == COREDUMP_STORAGE_EXTERNAL && |
| size <= arg_external_size_max) |
| return 0; |
| |
| if (!filename) |
| return 1; |
| |
| if (unlink(filename) < 0 && errno != ENOENT) |
| return log_error_errno(errno, "Failed to unlink %s: %m", filename); |
| |
| return 1; |
| } |
| |
| static int make_filename(const Context *context, char **ret) { |
| _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; |
| sd_id128_t boot = {}; |
| int r; |
| |
| assert(context); |
| |
| c = filename_escape(context->meta[META_COMM]); |
| if (!c) |
| return -ENOMEM; |
| |
| u = filename_escape(context->meta[META_ARGV_UID]); |
| if (!u) |
| return -ENOMEM; |
| |
| r = sd_id128_get_boot(&boot); |
| if (r < 0) |
| return r; |
| |
| p = filename_escape(context->meta[META_ARGV_PID]); |
| if (!p) |
| return -ENOMEM; |
| |
| t = filename_escape(context->meta[META_ARGV_TIMESTAMP]); |
| if (!t) |
| return -ENOMEM; |
| |
| if (asprintf(ret, |
| "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s", |
| c, |
| u, |
| SD_ID128_FORMAT_VAL(boot), |
| p, |
| t) < 0) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int save_external_coredump( |
| const Context *context, |
| int input_fd, |
| char **ret_filename, |
| int *ret_node_fd, |
| int *ret_data_fd, |
| uint64_t *ret_size, |
| uint64_t *ret_compressed_size, |
| bool *ret_truncated) { |
| |
| _cleanup_(unlink_and_freep) char *tmp = NULL; |
| _cleanup_free_ char *fn = NULL; |
| _cleanup_close_ int fd = -1; |
| uint64_t rlimit, process_limit, max_size; |
| bool truncated, storage_on_tmpfs; |
| struct stat st; |
| uid_t uid; |
| int r; |
| |
| assert(context); |
| assert(ret_filename); |
| assert(ret_node_fd); |
| assert(ret_data_fd); |
| assert(ret_size); |
| assert(ret_compressed_size); |
| assert(ret_truncated); |
| |
| r = parse_uid(context->meta[META_ARGV_UID], &uid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse UID: %m"); |
| |
| r = safe_atou64(context->meta[META_ARGV_RLIMIT], &rlimit); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse resource limit '%s': %m", |
| context->meta[META_ARGV_RLIMIT]); |
| if (rlimit < page_size()) |
| /* Is coredumping disabled? Then don't bother saving/processing the |
| * coredump. Anything below PAGE_SIZE cannot give a readable coredump |
| * (the kernel uses ELF_EXEC_PAGESIZE which is not easily accessible, but |
| * is usually the same as PAGE_SIZE. */ |
| return log_info_errno(SYNTHETIC_ERRNO(EBADSLT), |
| "Resource limits disable core dumping for process %s (%s).", |
| context->meta[META_ARGV_PID], context->meta[META_COMM]); |
| |
| process_limit = MAX(arg_process_size_max, storage_size_max()); |
| if (process_limit == 0) |
| return log_debug_errno(SYNTHETIC_ERRNO(EBADSLT), |
| "Limits for coredump processing and storage are both 0, not dumping core."); |
| |
| /* Never store more than the process configured, or than we actually shall keep or process */ |
| max_size = MIN(rlimit, process_limit); |
| |
| r = make_filename(context, &fn); |
| if (r < 0) |
| return log_error_errno(r, "Failed to determine coredump file name: %m"); |
| |
| (void) mkdir_p_label("/var/lib/systemd/coredump", 0755); |
| |
| fd = open_tmpfile_linkable(fn, O_RDWR|O_CLOEXEC, &tmp); |
| if (fd < 0) |
| return log_error_errno(fd, "Failed to create temporary file for coredump %s: %m", fn); |
| |
| /* If storage is on tmpfs, the kernel oomd might kill us if there's MemoryMax set on |
| * the service or the slice it belongs to. This is common on low-resources systems, |
| * to avoid crashing processes to take away too many system resources. |
| * Check the cgroup settings, and set max_size to a bit less than half of the |
| * available memory left to the process. |
| * Then, attempt to write the core file uncompressed first - if the write gets |
| * interrupted, we know we won't be able to write it all, so instead compress what |
| * was written so far, delete the uncompressed truncated core, and then continue |
| * compressing from STDIN. Given the compressed core cannot be larger than the |
| * uncompressed one, and 1KB for metadata is accounted for in the calculation, we |
| * should be able to at least store the full compressed core file. */ |
| |
| storage_on_tmpfs = fd_is_temporary_fs(fd) > 0; |
| if (storage_on_tmpfs && arg_compress) { |
| _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; |
| uint64_t cgroup_limit = UINT64_MAX; |
| struct statvfs sv; |
| |
| /* If we can't get the cgroup limit, just ignore it, but don't fail, |
| * try anyway with the config settings. */ |
| r = sd_bus_default_system(&bus); |
| if (r < 0) |
| log_info_errno(r, "Failed to connect to system bus, skipping MemoryAvailable check: %m"); |
| else { |
| _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
| |
| r = sd_bus_get_property_trivial( |
| bus, |
| "org.freedesktop.systemd1", |
| "/org/freedesktop/systemd1/unit/self", |
| "org.freedesktop.systemd1.Service", |
| "MemoryAvailable", |
| &error, |
| 't', &cgroup_limit); |
| if (r < 0) |
| log_warning_errno(r, |
| "Failed to query MemoryAvailable for current unit, " |
| "falling back to static config settings: %s", |
| bus_error_message(&error, r)); |
| } |
| |
| max_size = MIN(cgroup_limit, max_size); |
| max_size = LESS_BY(max_size, 1024U) / 2; /* Account for 1KB metadata overhead for compressing */ |
| max_size = MAX(PROCESS_SIZE_MIN, max_size); /* Impose a lower minimum */ |
| |
| /* tmpfs might get full quickly, so check the available space too. |
| * But don't worry about errors here, failing to access the storage |
| * location will be better logged when writing to it. */ |
| if (statvfs("/var/lib/systemd/coredump/", &sv) >= 0) |
| max_size = MIN((uint64_t)sv.f_frsize * (uint64_t)sv.f_bfree, max_size); |
| |
| log_debug("Limiting core file size to %" PRIu64 " bytes due to cgroup memory limits.", max_size); |
| } |
| |
| r = copy_bytes(input_fd, fd, max_size, 0); |
| if (r < 0) |
| return log_error_errno(r, "Cannot store coredump of %s (%s): %m", |
| context->meta[META_ARGV_PID], context->meta[META_COMM]); |
| truncated = r == 1; |
| |
| #if HAVE_COMPRESSION |
| if (arg_compress) { |
| _cleanup_(unlink_and_freep) char *tmp_compressed = NULL; |
| _cleanup_free_ char *fn_compressed = NULL; |
| _cleanup_close_ int fd_compressed = -1; |
| uint64_t uncompressed_size = 0; |
| |
| if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
| return log_error_errno(errno, "Failed to seek on coredump %s: %m", fn); |
| |
| fn_compressed = strjoin(fn, COMPRESSED_EXT); |
| if (!fn_compressed) |
| return log_oom(); |
| |
| fd_compressed = open_tmpfile_linkable(fn_compressed, O_RDWR|O_CLOEXEC, &tmp_compressed); |
| if (fd_compressed < 0) |
| return log_error_errno(fd_compressed, "Failed to create temporary file for coredump %s: %m", fn_compressed); |
| |
| r = compress_stream(fd, fd_compressed, max_size, &uncompressed_size); |
| if (r < 0) |
| return log_error_errno(r, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed)); |
| |
| if (truncated && storage_on_tmpfs) { |
| uint64_t partial_uncompressed_size = 0; |
| |
| /* Uncompressed write was truncated and we are writing to tmpfs: delete |
| * the uncompressed core, and compress the remaining part from STDIN. */ |
| |
| tmp = unlink_and_free(tmp); |
| fd = safe_close(fd); |
| |
| r = compress_stream(input_fd, fd_compressed, max_size, &partial_uncompressed_size); |
| if (r < 0) |
| return log_error_errno(r, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed)); |
| uncompressed_size += partial_uncompressed_size; |
| } |
| |
| r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, context, uid); |
| if (r < 0) |
| return r; |
| |
| if (fstat(fd_compressed, &st) < 0) |
| return log_error_errno(errno, |
| "Failed to fstat core file %s: %m", |
| coredump_tmpfile_name(tmp_compressed)); |
| |
| *ret_filename = TAKE_PTR(fn_compressed); /* compressed */ |
| *ret_node_fd = TAKE_FD(fd_compressed); /* compressed */ |
| *ret_compressed_size = (uint64_t) st.st_size; /* compressed */ |
| *ret_data_fd = TAKE_FD(fd); |
| *ret_size = uncompressed_size; |
| *ret_truncated = truncated; |
| tmp_compressed = mfree(tmp_compressed); |
| |
| return 0; |
| } |
| #endif |
| |
| if (truncated) |
| log_struct(LOG_INFO, |
| LOG_MESSAGE("Core file was truncated to %"PRIu64" bytes.", max_size), |
| "SIZE_LIMIT=%"PRIu64, max_size, |
| "MESSAGE_ID=" SD_MESSAGE_TRUNCATED_CORE_STR); |
| |
| r = fix_permissions(fd, tmp, fn, context, uid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to fix permissions and finalize coredump %s into %s: %m", coredump_tmpfile_name(tmp), fn); |
| |
| if (fstat(fd, &st) < 0) |
| return log_error_errno(errno, "Failed to fstat core file %s: %m", coredump_tmpfile_name(tmp)); |
| |
| if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
| return log_error_errno(errno, "Failed to seek on coredump %s: %m", fn); |
| |
| *ret_filename = TAKE_PTR(fn); |
| *ret_data_fd = TAKE_FD(fd); |
| *ret_size = (uint64_t) st.st_size; |
| *ret_truncated = truncated; |
| |
| return 0; |
| } |
| |
| static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { |
| _cleanup_free_ char *field = NULL; |
| ssize_t n; |
| |
| assert(fd >= 0); |
| assert(ret); |
| assert(ret_size); |
| |
| if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
| return log_warning_errno(errno, "Failed to seek: %m"); |
| |
| field = malloc(9 + size); |
| if (!field) { |
| log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
| return -ENOMEM; |
| } |
| |
| memcpy(field, "COREDUMP=", 9); |
| |
| n = read(fd, field + 9, size); |
| if (n < 0) |
| return log_error_errno((int) n, "Failed to read core data: %m"); |
| if ((size_t) n < size) |
| return log_error_errno(SYNTHETIC_ERRNO(EIO), |
| "Core data too short."); |
| |
| *ret = TAKE_PTR(field); |
| *ret_size = size + 9; |
| |
| return 0; |
| } |
| |
| /* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines: |
| * 0:/dev/pts/23 |
| * pos: 0 |
| * flags: 0100002 |
| * |
| * 1:/dev/pts/23 |
| * pos: 0 |
| * flags: 0100002 |
| * |
| * 2:/dev/pts/23 |
| * pos: 0 |
| * flags: 0100002 |
| * EOF |
| */ |
| static int compose_open_fds(pid_t pid, char **open_fds) { |
| _cleanup_closedir_ DIR *proc_fd_dir = NULL; |
| _cleanup_close_ int proc_fdinfo_fd = -1; |
| _cleanup_free_ char *buffer = NULL; |
| _cleanup_fclose_ FILE *stream = NULL; |
| const char *fddelim = "", *path; |
| struct dirent *dent = NULL; |
| size_t size = 0; |
| int r; |
| |
| assert(pid >= 0); |
| assert(open_fds != NULL); |
| |
| path = procfs_file_alloca(pid, "fd"); |
| proc_fd_dir = opendir(path); |
| if (!proc_fd_dir) |
| return -errno; |
| |
| proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH); |
| if (proc_fdinfo_fd < 0) |
| return -errno; |
| |
| stream = open_memstream_unlocked(&buffer, &size); |
| if (!stream) |
| return -ENOMEM; |
| |
| FOREACH_DIRENT(dent, proc_fd_dir, return -errno) { |
| _cleanup_fclose_ FILE *fdinfo = NULL; |
| _cleanup_free_ char *fdname = NULL; |
| _cleanup_close_ int fd = -1; |
| |
| r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname); |
| if (r < 0) |
| return r; |
| |
| fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname); |
| fddelim = "\n"; |
| |
| /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */ |
| fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY); |
| if (fd < 0) |
| continue; |
| |
| fdinfo = take_fdopen(&fd, "r"); |
| if (!fdinfo) |
| continue; |
| |
| for (;;) { |
| _cleanup_free_ char *line = NULL; |
| |
| r = read_line(fdinfo, LONG_LINE_MAX, &line); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| |
| fputs(line, stream); |
| fputc('\n', stream); |
| } |
| } |
| |
| errno = 0; |
| stream = safe_fclose(stream); |
| |
| if (errno > 0) |
| return -errno; |
| |
| *open_fds = TAKE_PTR(buffer); |
| |
| return 0; |
| } |
| |
| static int get_process_ns(pid_t pid, const char *namespace, ino_t *ns) { |
| const char *p; |
| struct stat stbuf; |
| _cleanup_close_ int proc_ns_dir_fd = -1; |
| |
| p = procfs_file_alloca(pid, "ns"); |
| |
| proc_ns_dir_fd = open(p, O_DIRECTORY | O_CLOEXEC | O_RDONLY); |
| if (proc_ns_dir_fd < 0) |
| return -errno; |
| |
| if (fstatat(proc_ns_dir_fd, namespace, &stbuf, /* flags */0) < 0) |
| return -errno; |
| |
| *ns = stbuf.st_ino; |
| return 0; |
| } |
| |
| static int get_mount_namespace_leader(pid_t pid, pid_t *ret) { |
| ino_t proc_mntns; |
| int r; |
| |
| r = get_process_ns(pid, "mnt", &proc_mntns); |
| if (r < 0) |
| return r; |
| |
| for (;;) { |
| ino_t parent_mntns; |
| pid_t ppid; |
| |
| r = get_process_ppid(pid, &ppid); |
| if (r == -EADDRNOTAVAIL) /* Reached the top (i.e. typically PID 1, but could also be a process |
| * whose parent is not in our pidns) */ |
| return -ENOENT; |
| if (r < 0) |
| return r; |
| |
| r = get_process_ns(ppid, "mnt", &parent_mntns); |
| if (r < 0) |
| return r; |
| |
| if (proc_mntns != parent_mntns) { |
| *ret = ppid; |
| return 0; |
| } |
| |
| pid = ppid; |
| } |
| } |
| |
| /* Returns 1 if the parent was found. |
| * Returns 0 if there is not a process we can call the pid's |
| * container parent (the pid's process isn't 'containerized'). |
| * Returns a negative number on errors. |
| */ |
| static int get_process_container_parent_cmdline(pid_t pid, char** cmdline) { |
| int r = 0; |
| pid_t container_pid; |
| const char *proc_root_path; |
| struct stat root_stat, proc_root_stat; |
| |
| /* To compare inodes of / and /proc/[pid]/root */ |
| if (stat("/", &root_stat) < 0) |
| return -errno; |
| |
| proc_root_path = procfs_file_alloca(pid, "root"); |
| if (stat(proc_root_path, &proc_root_stat) < 0) |
| return -errno; |
| |
| /* The process uses system root. */ |
| if (proc_root_stat.st_ino == root_stat.st_ino) { |
| *cmdline = NULL; |
| return 0; |
| } |
| |
| r = get_mount_namespace_leader(pid, &container_pid); |
| if (r < 0) |
| return r; |
| |
| r = get_process_cmdline(container_pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, cmdline); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int change_uid_gid(const Context *context) { |
| uid_t uid; |
| gid_t gid; |
| int r; |
| |
| r = parse_uid(context->meta[META_ARGV_UID], &uid); |
| if (r < 0) |
| return r; |
| |
| if (uid_is_system(uid)) { |
| const char *user = "systemd-coredump"; |
| |
| r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0); |
| if (r < 0) { |
| log_warning_errno(r, "Cannot resolve %s user. Proceeding to dump core as root: %m", user); |
| uid = gid = 0; |
| } |
| } else { |
| r = parse_gid(context->meta[META_ARGV_GID], &gid); |
| if (r < 0) |
| return r; |
| } |
| |
| return drop_privileges(uid, gid, 0); |
| } |
| |
| static int submit_coredump( |
| Context *context, |
| struct iovec_wrapper *iovw, |
| int input_fd) { |
| |
| _cleanup_(json_variant_unrefp) JsonVariant *json_metadata = NULL; |
| _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1; |
| _cleanup_free_ char *filename = NULL, *coredump_data = NULL; |
| _cleanup_free_ char *stacktrace = NULL; |
| char *core_message; |
| const char *module_name; |
| uint64_t coredump_size = UINT64_MAX, coredump_compressed_size = UINT64_MAX; |
| bool truncated = false; |
| JsonVariant *module_json; |
| int r; |
| assert(context); |
| assert(iovw); |
| assert(input_fd >= 0); |
| |
| /* Vacuum before we write anything again */ |
| (void) coredump_vacuum(-1, arg_keep_free, arg_max_use); |
| |
| /* Always stream the coredump to disk, if that's possible */ |
| r = save_external_coredump(context, input_fd, |
| &filename, &coredump_node_fd, &coredump_fd, |
| &coredump_size, &coredump_compressed_size, &truncated); |
| if (r < 0) |
| /* Skip whole core dumping part */ |
| goto log; |
| |
| /* If we don't want to keep the coredump on disk, remove it now, as later on we |
| * will lack the privileges for it. However, we keep the fd to it, so that we can |
| * still process it and log it. */ |
| r = maybe_remove_external_coredump(filename, coredump_node_fd >= 0 ? coredump_compressed_size : coredump_size); |
| if (r < 0) |
| return r; |
| if (r == 0) { |
| (void) iovw_put_string_field(iovw, "COREDUMP_FILENAME=", filename); |
| |
| } else if (arg_storage == COREDUMP_STORAGE_EXTERNAL) |
| log_info("The core will not be stored: size %"PRIu64" is greater than %"PRIu64" (the configured maximum)", |
| coredump_node_fd >= 0 ? coredump_compressed_size : coredump_size, arg_external_size_max); |
| |
| /* Vacuum again, but exclude the coredump we just created */ |
| (void) coredump_vacuum(coredump_node_fd >= 0 ? coredump_node_fd : coredump_fd, arg_keep_free, arg_max_use); |
| |
| /* Now, let's drop privileges to become the user who owns the segfaulted process |
| * and allocate the coredump memory under the user's uid. This also ensures that |
| * the credentials journald will see are the ones of the coredumping user, thus |
| * making sure the user gets access to the core dump. Let's also get rid of all |
| * capabilities, if we run as root, we won't need them anymore. */ |
| r = change_uid_gid(context); |
| if (r < 0) |
| return log_error_errno(r, "Failed to drop privileges: %m"); |
| |
| #if HAVE_ELFUTILS |
| /* Try to get a stack trace if we can */ |
| if (coredump_size > arg_process_size_max) { |
| log_debug("Not generating stack trace: core size %"PRIu64" is greater " |
| "than %"PRIu64" (the configured maximum)", |
| coredump_size, arg_process_size_max); |
| } else if (coredump_fd >= 0) |
| coredump_parse_core(coredump_fd, context->meta[META_EXE], &stacktrace, &json_metadata); |
| #endif |
| |
| log: |
| core_message = strjoina("Process ", context->meta[META_ARGV_PID], |
| " (", context->meta[META_COMM], ") of user ", |
| context->meta[META_ARGV_UID], " dumped core.", |
| context->is_journald && filename ? "\nCoredump diverted to " : NULL, |
| context->is_journald && filename ? filename : NULL); |
| |
| core_message = strjoina(core_message, stacktrace ? "\n\n" : NULL, stacktrace); |
| |
| if (context->is_journald) { |
| /* We cannot log to the journal, so just print the message. |
| * The target was set previously to something safe. */ |
| log_dispatch(LOG_ERR, 0, core_message); |
| return 0; |
| } |
| |
| (void) iovw_put_string_field(iovw, "MESSAGE=", core_message); |
| |
| if (truncated) |
| (void) iovw_put_string_field(iovw, "COREDUMP_TRUNCATED=", "1"); |
| |
| /* If we managed to parse any ELF metadata (build-id, ELF package meta), |
| * attach it as journal metadata. */ |
| if (json_metadata) { |
| _cleanup_free_ char *formatted_json = NULL; |
| |
| r = json_variant_format(json_metadata, 0, &formatted_json); |
| if (r < 0) |
| return log_error_errno(r, "Failed to format JSON package metadata: %m"); |
| |
| (void) iovw_put_string_field(iovw, "COREDUMP_PACKAGE_JSON=", formatted_json); |
| } |
| |
| JSON_VARIANT_OBJECT_FOREACH(module_name, module_json, json_metadata) { |
| JsonVariant *package_name, *package_version; |
| |
| /* We only add structured fields for the 'main' ELF module */ |
| if (!path_equal_filename(module_name, context->meta[META_EXE])) |
| continue; |
| |
| package_name = json_variant_by_key(module_json, "name"); |
| if (package_name) |
| (void) iovw_put_string_field(iovw, "COREDUMP_PACKAGE_NAME=", json_variant_string(package_name)); |
| |
| package_version = json_variant_by_key(module_json, "version"); |
| if (package_version) |
| (void) iovw_put_string_field(iovw, "COREDUMP_PACKAGE_VERSION=", json_variant_string(package_version)); |
| } |
| |
| /* Optionally store the entire coredump in the journal */ |
| if (arg_storage == COREDUMP_STORAGE_JOURNAL && coredump_fd >= 0) { |
| if (coredump_size <= arg_journal_size_max) { |
| size_t sz = 0; |
| |
| /* Store the coredump itself in the journal */ |
| |
| r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
| if (r >= 0) { |
| if (iovw_put(iovw, coredump_data, sz) >= 0) |
| TAKE_PTR(coredump_data); |
| } else |
| log_warning_errno(r, "Failed to attach the core to the journal entry: %m"); |
| } else |
| log_info("The core will not be stored: size %"PRIu64" is greater than %"PRIu64" (the configured maximum)", |
| coredump_size, arg_journal_size_max); |
| } |
| |
| r = sd_journal_sendv(iovw->iovec, iovw->count); |
| if (r < 0) |
| return log_error_errno(r, "Failed to log coredump: %m"); |
| |
| return 0; |
| } |
| |
| static int save_context(Context *context, const struct iovec_wrapper *iovw) { |
| unsigned count = 0; |
| const char *unit; |
| int r; |
| |
| assert(context); |
| assert(iovw); |
| assert(iovw->count >= _META_ARGV_MAX); |
| |
| /* The context does not allocate any memory on its own */ |
| |
| for (size_t n = 0; n < iovw->count; n++) { |
| struct iovec *iovec = iovw->iovec + n; |
| |
| for (size_t i = 0; i < ELEMENTSOF(meta_field_names); i++) { |
| char *p; |
| |
| /* Note that these strings are NUL terminated, because we made sure that a |
| * trailing NUL byte is in the buffer, though not included in the iov_len |
| * count (see process_socket() and gather_pid_metadata_*()) */ |
| assert(((char*) iovec->iov_base)[iovec->iov_len] == 0); |
| |
| p = startswith(iovec->iov_base, meta_field_names[i]); |
| if (p) { |
| context->meta[i] = p; |
| count++; |
| break; |
| } |
| } |
| } |
| |
| if (!context->meta[META_ARGV_PID]) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "Failed to find the PID of crashing process"); |
| |
| r = parse_pid(context->meta[META_ARGV_PID], &context->pid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse PID \"%s\": %m", context->meta[META_ARGV_PID]); |
| |
| unit = context->meta[META_UNIT]; |
| context->is_pid1 = streq(context->meta[META_ARGV_PID], "1") || streq_ptr(unit, SPECIAL_INIT_SCOPE); |
| context->is_journald = streq_ptr(unit, SPECIAL_JOURNALD_SERVICE); |
| |
| return 0; |
| } |
| |
| static int process_socket(int fd) { |
| _cleanup_close_ int input_fd = -1; |
| Context context = {}; |
| struct iovec_wrapper iovw = {}; |
| struct iovec iovec; |
| int r; |
| |
| assert(fd >= 0); |
| |
| log_setup(); |
| |
| log_debug("Processing coredump received on stdin..."); |
| |
| for (;;) { |
| CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int))) control; |
| struct msghdr mh = { |
| .msg_control = &control, |
| .msg_controllen = sizeof(control), |
| .msg_iovlen = 1, |
| }; |
| ssize_t n; |
| ssize_t l; |
| |
| l = next_datagram_size_fd(fd); |
| if (l < 0) { |
| r = log_error_errno(l, "Failed to determine datagram size to read: %m"); |
| goto finish; |
| } |
| |
| iovec.iov_len = l; |
| iovec.iov_base = malloc(l + 1); |
| if (!iovec.iov_base) { |
| r = log_oom(); |
| goto finish; |
| } |
| |
| mh.msg_iov = &iovec; |
| |
| n = recvmsg_safe(fd, &mh, MSG_CMSG_CLOEXEC); |
| if (n < 0) { |
| free(iovec.iov_base); |
| r = log_error_errno(n, "Failed to receive datagram: %m"); |
| goto finish; |
| } |
| |
| /* The final zero-length datagram carries the file descriptor and tells us |
| * that we're done. */ |
| if (n == 0) { |
| struct cmsghdr *found; |
| |
| free(iovec.iov_base); |
| |
| found = cmsg_find(&mh, SOL_SOCKET, SCM_RIGHTS, CMSG_LEN(sizeof(int))); |
| if (!found) { |
| cmsg_close_all(&mh); |
| r = log_error_errno(SYNTHETIC_ERRNO(EBADMSG), |
| "Coredump file descriptor missing."); |
| goto finish; |
| } |
| |
| assert(input_fd < 0); |
| input_fd = *(int*) CMSG_DATA(found); |
| break; |
| } else |
| cmsg_close_all(&mh); |
| |
| /* Add trailing NUL byte, in case these are strings */ |
| ((char*) iovec.iov_base)[n] = 0; |
| iovec.iov_len = (size_t) n; |
| |
| r = iovw_put(&iovw, iovec.iov_base, iovec.iov_len); |
| if (r < 0) |
| goto finish; |
| } |
| |
| /* Make sure we got all data we really need */ |
| assert(input_fd >= 0); |
| |
| r = save_context(&context, &iovw); |
| if (r < 0) |
| goto finish; |
| |
| /* Make sure we received at least all fields we need. */ |
| for (int i = 0; i < _META_MANDATORY_MAX; i++) |
| if (!context.meta[i]) { |
| r = log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "A mandatory argument (%i) has not been sent, aborting.", |
| i); |
| goto finish; |
| } |
| |
| r = submit_coredump(&context, &iovw, input_fd); |
| |
| finish: |
| iovw_free_contents(&iovw, true); |
| return r; |
| } |
| |
| static int send_iovec(const struct iovec_wrapper *iovw, int input_fd) { |
| |
| static const union sockaddr_union sa = { |
| .un.sun_family = AF_UNIX, |
| .un.sun_path = "/run/systemd/coredump", |
| }; |
| _cleanup_close_ int fd = -1; |
| int r; |
| |
| assert(iovw); |
| assert(input_fd >= 0); |
| |
| fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0); |
| if (fd < 0) |
| return log_error_errno(errno, "Failed to create coredump socket: %m"); |
| |
| if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) |
| return log_error_errno(errno, "Failed to connect to coredump service: %m"); |
| |
| for (size_t i = 0; i < iovw->count; i++) { |
| struct msghdr mh = { |
| .msg_iov = iovw->iovec + i, |
| .msg_iovlen = 1, |
| }; |
| struct iovec copy[2]; |
| |
| for (;;) { |
| if (sendmsg(fd, &mh, MSG_NOSIGNAL) >= 0) |
| break; |
| |
| if (errno == EMSGSIZE && mh.msg_iov[0].iov_len > 0) { |
| /* This field didn't fit? That's a pity. Given that this is |
| * just metadata, let's truncate the field at half, and try |
| * again. We append three dots, in order to show that this is |
| * truncated. */ |
| |
| if (mh.msg_iov != copy) { |
| /* We don't want to modify the caller's iovec, hence |
| * let's create our own array, consisting of two new |
| * iovecs, where the first is a (truncated) copy of |
| * what we want to send, and the second one contains |
| * the trailing dots. */ |
| copy[0] = iovw->iovec[i]; |
| copy[1] = IOVEC_MAKE(((char[]){'.', '.', '.'}), 3); |
| |
| mh.msg_iov = copy; |
| mh.msg_iovlen = 2; |
| } |
| |
| copy[0].iov_len /= 2; /* halve it, and try again */ |
| continue; |
| } |
| |
| return log_error_errno(errno, "Failed to send coredump datagram: %m"); |
| } |
| } |
| |
| r = send_one_fd(fd, input_fd, 0); |
| if (r < 0) |
| return log_error_errno(r, "Failed to send coredump fd: %m"); |
| |
| return 0; |
| } |
| |
| static int gather_pid_metadata_from_argv( |
| struct iovec_wrapper *iovw, |
| Context *context, |
| int argc, char **argv) { |
| |
| _cleanup_free_ char *free_timestamp = NULL; |
| int r, signo; |
| char *t; |
| |
| /* We gather all metadata that were passed via argv[] into an array of iovecs that |
| * we'll forward to the socket unit */ |
| |
| if (argc < _META_ARGV_MAX) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "Not enough arguments passed by the kernel (%i, expected %i).", |
| argc, _META_ARGV_MAX); |
| |
| for (int i = 0; i < _META_ARGV_MAX; i++) { |
| |
| t = argv[i]; |
| |
| switch (i) { |
| |
| case META_ARGV_TIMESTAMP: |
| /* The journal fields contain the timestamp padded with six |
| * zeroes, so that the kernel-supplied 1s granularity timestamps |
| * becomes 1µs granularity, i.e. the granularity systemd usually |
| * operates in. */ |
| t = free_timestamp = strjoin(argv[i], "000000"); |
| if (!t) |
| return log_oom(); |
| break; |
| |
| case META_ARGV_SIGNAL: |
| /* For signal, record its pretty name too */ |
| if (safe_atoi(argv[i], &signo) >= 0 && SIGNAL_VALID(signo)) |
| (void) iovw_put_string_field(iovw, "COREDUMP_SIGNAL_NAME=SIG", |
| signal_to_string(signo)); |
| break; |
| |
| default: |
| break; |
| } |
| |
| r = iovw_put_string_field(iovw, meta_field_names[i], t); |
| if (r < 0) |
| return r; |
| } |
| |
| /* Cache some of the process metadata we collected so far and that we'll need to |
| * access soon */ |
| return save_context(context, iovw); |
| } |
| |
| static int gather_pid_metadata(struct iovec_wrapper *iovw, Context *context) { |
| uid_t owner_uid; |
| pid_t pid; |
| char *t; |
| const char *p; |
| int r; |
| |
| /* Note that if we fail on oom later on, we do not roll-back changes to the iovec |
| * structure. (It remains valid, with the first iovec fields initialized.) */ |
| |
| pid = context->pid; |
| |
| /* The following is mandatory */ |
| r = get_process_comm(pid, &t); |
| if (r < 0) |
| return log_error_errno(r, "Failed to get COMM: %m"); |
| |
| r = iovw_put_string_field_free(iovw, "COREDUMP_COMM=", t); |
| if (r < 0) |
| return r; |
| |
| /* The following are optional but we used them if present */ |
| r = get_process_exe(pid, &t); |
| if (r >= 0) |
| r = iovw_put_string_field_free(iovw, "COREDUMP_EXE=", t); |
| if (r < 0) |
| log_warning_errno(r, "Failed to get EXE, ignoring: %m"); |
| |
| if (cg_pid_get_unit(pid, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_UNIT=", t); |
| |
| /* The next are optional */ |
| if (cg_pid_get_user_unit(pid, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_USER_UNIT=", t); |
| |
| if (sd_pid_get_session(pid, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_SESSION=", t); |
| |
| if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
| r = asprintf(&t, UID_FMT, owner_uid); |
| if (r > 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_OWNER_UID=", t); |
| } |
| |
| if (sd_pid_get_slice(pid, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_SLICE=", t); |
| |
| if (get_process_cmdline(pid, SIZE_MAX, PROCESS_CMDLINE_QUOTE_POSIX, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_CMDLINE=", t); |
| |
| if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_CGROUP=", t); |
| |
| if (compose_open_fds(pid, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_OPEN_FDS=", t); |
| |
| p = procfs_file_alloca(pid, "status"); |
| if (read_full_virtual_file(p, &t, NULL) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_STATUS=", t); |
| |
| p = procfs_file_alloca(pid, "maps"); |
| if (read_full_virtual_file(p, &t, NULL) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_MAPS=", t); |
| |
| p = procfs_file_alloca(pid, "limits"); |
| if (read_full_virtual_file(p, &t, NULL) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_LIMITS=", t); |
| |
| p = procfs_file_alloca(pid, "cgroup"); |
| if (read_full_virtual_file(p, &t, NULL) >=0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_CGROUP=", t); |
| |
| p = procfs_file_alloca(pid, "mountinfo"); |
| if (read_full_virtual_file(p, &t, NULL) >=0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_MOUNTINFO=", t); |
| |
| if (get_process_cwd(pid, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_CWD=", t); |
| |
| if (get_process_root(pid, &t) >= 0) { |
| bool proc_self_root_is_slash; |
| |
| proc_self_root_is_slash = strcmp(t, "/") == 0; |
| |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_ROOT=", t); |
| |
| /* If the process' root is "/", then there is a chance it has |
| * mounted own root and hence being containerized. */ |
| if (proc_self_root_is_slash && get_process_container_parent_cmdline(pid, &t) > 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_CONTAINER_CMDLINE=", t); |
| } |
| |
| if (get_process_environ(pid, &t) >= 0) |
| (void) iovw_put_string_field_free(iovw, "COREDUMP_ENVIRON=", t); |
| |
| /* we successfully acquired all metadata */ |
| return save_context(context, iovw); |
| } |
| |
| static int process_kernel(int argc, char* argv[]) { |
| Context context = {}; |
| struct iovec_wrapper *iovw; |
| int r; |
| |
| log_debug("Processing coredump received from the kernel..."); |
| |
| iovw = iovw_new(); |
| if (!iovw) |
| return log_oom(); |
| |
| (void) iovw_put_string_field(iovw, "MESSAGE_ID=", SD_MESSAGE_COREDUMP_STR); |
| (void) iovw_put_string_field(iovw, "PRIORITY=", STRINGIFY(LOG_CRIT)); |
| |
| /* Collect all process metadata passed by the kernel through argv[] */ |
| r = gather_pid_metadata_from_argv(iovw, &context, argc - 1, argv + 1); |
| if (r < 0) |
| goto finish; |
| |
| /* Collect the rest of the process metadata retrieved from the runtime */ |
| r = gather_pid_metadata(iovw, &context); |
| if (r < 0) |
| goto finish; |
| |
| if (!context.is_journald) { |
| /* OK, now we know it's not the journal, hence we can make use of it now. */ |
| log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
| log_open(); |
| } |
| |
| /* If this is PID 1 disable coredump collection, we'll unlikely be able to process |
| * it later on. |
| * |
| * FIXME: maybe we should disable coredumps generation from the beginning and |
| * re-enable it only when we know it's either safe (ie we're not running OOM) or |
| * it's not pid1 ? */ |
| if (context.is_pid1) { |
| log_notice("Due to PID 1 having crashed coredump collection will now be turned off."); |
| disable_coredumps(); |
| } |
| |
| if (context.is_journald || context.is_pid1) |
| r = submit_coredump(&context, iovw, STDIN_FILENO); |
| else |
| r = send_iovec(iovw, STDIN_FILENO); |
| |
| finish: |
| iovw = iovw_free_free(iovw); |
| return r; |
| } |
| |
| static int process_backtrace(int argc, char *argv[]) { |
| Context context = {}; |
| struct iovec_wrapper *iovw; |
| char *message; |
| int r; |
| _cleanup_(journal_importer_cleanup) JournalImporter importer = JOURNAL_IMPORTER_INIT(STDIN_FILENO); |
| |
| log_debug("Processing backtrace on stdin..."); |
| |
| iovw = iovw_new(); |
| if (!iovw) |
| return log_oom(); |
| |
| (void) iovw_put_string_field(iovw, "MESSAGE_ID=", SD_MESSAGE_BACKTRACE_STR); |
| (void) iovw_put_string_field(iovw, "PRIORITY=", STRINGIFY(LOG_CRIT)); |
| |
| /* Collect all process metadata from argv[] by making sure to skip the |
| * '--backtrace' option */ |
| r = gather_pid_metadata_from_argv(iovw, &context, argc - 2, argv + 2); |
| if (r < 0) |
| goto finish; |
| |
| /* Collect the rest of the process metadata retrieved from the runtime */ |
| r = gather_pid_metadata(iovw, &context); |
| if (r < 0) |
| goto finish; |
| |
| for (;;) { |
| r = journal_importer_process_data(&importer); |
| if (r < 0) { |
| log_error_errno(r, "Failed to parse journal entry on stdin: %m"); |
| goto finish; |
| } |
| if (r == 1 || /* complete entry */ |
| journal_importer_eof(&importer)) /* end of data */ |
| break; |
| } |
| |
| if (journal_importer_eof(&importer)) { |
| log_warning("Did not receive a full journal entry on stdin, ignoring message sent by reporter"); |
| |
| message = strjoina("Process ", context.meta[META_ARGV_PID], |
| " (", context.meta[META_COMM], ")" |
| " of user ", context.meta[META_ARGV_UID], |
| " failed with ", context.meta[META_ARGV_SIGNAL]); |
| |
| r = iovw_put_string_field(iovw, "MESSAGE=", message); |
| if (r < 0) |
| return r; |
| } else { |
| /* The imported iovecs are not supposed to be freed by us so let's store |
| * them at the end of the array so we can skip them while freeing the |
| * rest. */ |
| for (size_t i = 0; i < importer.iovw.count; i++) { |
| struct iovec *iovec = importer.iovw.iovec + i; |
| |
| iovw_put(iovw, iovec->iov_base, iovec->iov_len); |
| } |
| } |
| |
| r = sd_journal_sendv(iovw->iovec, iovw->count); |
| if (r < 0) |
| log_error_errno(r, "Failed to log backtrace: %m"); |
| |
| finish: |
| iovw->count -= importer.iovw.count; |
| iovw = iovw_free_free(iovw); |
| return r; |
| } |
| |
| static int run(int argc, char *argv[]) { |
| int r; |
| |
| /* First, log to a safe place, since we don't know what crashed and it might |
| * be journald which we'd rather not log to then. */ |
| |
| log_set_target(LOG_TARGET_KMSG); |
| log_open(); |
| |
| /* Make sure we never enter a loop */ |
| (void) prctl(PR_SET_DUMPABLE, 0); |
| |
| /* Ignore all parse errors */ |
| (void) parse_config(); |
| |
| log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); |
| log_debug("Selected compression %s.", yes_no(arg_compress)); |
| |
| r = sd_listen_fds(false); |
| if (r < 0) |
| return log_error_errno(r, "Failed to determine the number of file descriptors: %m"); |
| |
| /* If we got an fd passed, we are running in coredumpd mode. Otherwise we |
| * are invoked from the kernel as coredump handler. */ |
| if (r == 0) { |
| if (streq_ptr(argv[1], "--backtrace")) |
| return process_backtrace(argc, argv); |
| else |
| return process_kernel(argc, argv); |
| } else if (r == 1) |
| return process_socket(SD_LISTEN_FDS_START); |
| |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "Received unexpected number of file descriptors."); |
| } |
| |
| DEFINE_MAIN_FUNCTION(run); |
