| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdio_ext.h> |
| #include <sys/prctl.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 "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 "missing.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 "string-table.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "user-util.h" |
| #include "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 */ |
| #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) |
| |
| /* Make sure to not make this larger than the maximum journal entry |
| * size. See DATA_SIZE_MAX in journald-native.c. */ |
| assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); |
| |
| enum { |
| /* We use this as array indexes for a couple of special fields we use for |
| * naming coredump files, and attaching xattrs, and for indexing argv[]. |
| |
| * Our pattern for man:systectl(1) kernel.core_pattern is such that the |
| * kernel passes fields until CONTEXT_RLIMIT as arguments in argv[]. After |
| * that it gets complicated: the kernel passes "comm" as one or more fields |
| * starting at index CONTEXT_COMM (in other words, full "comm" is under index |
| * CONTEXT_COMM when it does not contain spaces, which is the common |
| * case). This mapping is not reversible, so we prefer to retrieve "comm" |
| * from /proc. We only fall back to argv[CONTEXT_COMM...] when that fails. |
| * |
| * In the internal context[] array, fields before CONTEXT_COMM are the |
| * strings from argv[], so they should not be freed. The strings at indices |
| * CONTEXT_COMM and higher are allocated by us and should be freed at the |
| * end. |
| */ |
| CONTEXT_PID, |
| CONTEXT_UID, |
| CONTEXT_GID, |
| CONTEXT_SIGNAL, |
| CONTEXT_TIMESTAMP, |
| CONTEXT_RLIMIT, |
| CONTEXT_HOSTNAME, |
| CONTEXT_COMM, |
| CONTEXT_EXE, |
| CONTEXT_UNIT, |
| _CONTEXT_MAX |
| }; |
| |
| typedef enum CoredumpStorage { |
| COREDUMP_STORAGE_NONE, |
| COREDUMP_STORAGE_EXTERNAL, |
| COREDUMP_STORAGE_JOURNAL, |
| _COREDUMP_STORAGE_MAX, |
| _COREDUMP_STORAGE_INVALID = -1 |
| } 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_t) -1; |
| static uint64_t arg_max_use = (uint64_t) -1; |
| |
| 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); |
| } |
| |
| static inline 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 |
| _cleanup_(acl_freep) acl_t acl = NULL; |
| acl_entry_t entry; |
| acl_permset_t permset; |
| int r; |
| |
| assert(fd >= 0); |
| |
| 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 */ |
| |
| acl = acl_get_fd(fd); |
| if (!acl) |
| return log_error_errno(errno, "Failed to get ACL: %m"); |
| |
| if (acl_create_entry(&acl, &entry) < 0 || |
| acl_set_tag_type(entry, ACL_USER) < 0 || |
| acl_set_qualifier(entry, &uid) < 0) |
| return log_error_errno(errno, "Failed to patch ACL: %m"); |
| |
| if (acl_get_permset(entry, &permset) < 0 || |
| acl_add_perm(permset, ACL_READ) < 0) |
| return log_warning_errno(errno, "Failed to patch ACL: %m"); |
| |
| r = calc_acl_mask_if_needed(&acl); |
| if (r < 0) |
| return log_warning_errno(r, "Failed to patch ACL: %m"); |
| |
| if (acl_set_fd(fd, acl) < 0) |
| return log_error_errno(errno, "Failed to apply ACL: %m"); |
| #endif |
| |
| return 0; |
| } |
| |
| static int fix_xattr(int fd, const char *context[_CONTEXT_MAX]) { |
| |
| static const char * const xattrs[_CONTEXT_MAX] = { |
| [CONTEXT_PID] = "user.coredump.pid", |
| [CONTEXT_UID] = "user.coredump.uid", |
| [CONTEXT_GID] = "user.coredump.gid", |
| [CONTEXT_SIGNAL] = "user.coredump.signal", |
| [CONTEXT_TIMESTAMP] = "user.coredump.timestamp", |
| [CONTEXT_RLIMIT] = "user.coredump.rlimit", |
| [CONTEXT_HOSTNAME] = "user.coredump.hostname", |
| [CONTEXT_COMM] = "user.coredump.comm", |
| [CONTEXT_EXE] = "user.coredump.exe", |
| }; |
| |
| int r = 0; |
| unsigned i; |
| |
| assert(fd >= 0); |
| |
| /* Attach some metadata to coredumps via extended |
| * attributes. Just because we can. */ |
| |
| for (i = 0; i < _CONTEXT_MAX; i++) { |
| int k; |
| |
| if (isempty(context[i]) || !xattrs[i]) |
| continue; |
| |
| k = fsetxattr(fd, xattrs[i], context[i], strlen(context[i]), XATTR_CREATE); |
| if (k < 0 && r == 0) |
| r = -errno; |
| } |
| |
| return r; |
| } |
| |
| #define filename_escape(s) xescape((s), "./ ") |
| |
| static inline 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 char *context[_CONTEXT_MAX], |
| 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 char *context[_CONTEXT_MAX], 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[CONTEXT_COMM]); |
| if (!c) |
| return -ENOMEM; |
| |
| u = filename_escape(context[CONTEXT_UID]); |
| if (!u) |
| return -ENOMEM; |
| |
| r = sd_id128_get_boot(&boot); |
| if (r < 0) |
| return r; |
| |
| p = filename_escape(context[CONTEXT_PID]); |
| if (!p) |
| return -ENOMEM; |
| |
| t = filename_escape(context[CONTEXT_TIMESTAMP]); |
| if (!t) |
| return -ENOMEM; |
| |
| if (asprintf(ret, |
| "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
| c, |
| u, |
| SD_ID128_FORMAT_VAL(boot), |
| p, |
| t) < 0) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int save_external_coredump( |
| const char *context[_CONTEXT_MAX], |
| int input_fd, |
| char **ret_filename, |
| int *ret_node_fd, |
| int *ret_data_fd, |
| uint64_t *ret_size, |
| bool *ret_truncated) { |
| |
| _cleanup_free_ char *fn = NULL, *tmp = NULL; |
| _cleanup_close_ int fd = -1; |
| uint64_t rlimit, process_limit, max_size; |
| struct stat st; |
| uid_t uid; |
| int r; |
| |
| assert(context); |
| assert(ret_filename); |
| assert(ret_node_fd); |
| assert(ret_data_fd); |
| assert(ret_size); |
| |
| r = parse_uid(context[CONTEXT_UID], &uid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse UID: %m"); |
| |
| r = safe_atou64(context[CONTEXT_RLIMIT], &rlimit); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse resource limit: %s", context[CONTEXT_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. */ |
| log_info("Resource limits disable core dumping for process %s (%s).", |
| context[CONTEXT_PID], context[CONTEXT_COMM]); |
| return -EBADSLT; |
| } |
| |
| process_limit = MAX(arg_process_size_max, storage_size_max()); |
| if (process_limit == 0) { |
| log_debug("Limits for coredump processing and storage are both 0, not dumping core."); |
| return -EBADSLT; |
| } |
| |
| /* 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"); |
| |
| 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); |
| |
| r = copy_bytes(input_fd, fd, max_size, 0); |
| if (r < 0) { |
| log_error_errno(r, "Cannot store coredump of %s (%s): %m", context[CONTEXT_PID], context[CONTEXT_COMM]); |
| goto fail; |
| } |
| *ret_truncated = r == 1; |
| if (*ret_truncated) |
| log_struct(LOG_INFO, |
| LOG_MESSAGE("Core file was truncated to %zu bytes.", max_size), |
| "SIZE_LIMIT=%zu", max_size, |
| "MESSAGE_ID=" SD_MESSAGE_TRUNCATED_CORE_STR); |
| |
| if (fstat(fd, &st) < 0) { |
| log_error_errno(errno, "Failed to fstat core file %s: %m", coredump_tmpfile_name(tmp)); |
| goto fail; |
| } |
| |
| if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
| log_error_errno(errno, "Failed to seek on %s: %m", coredump_tmpfile_name(tmp)); |
| goto fail; |
| } |
| |
| #if HAVE_XZ || HAVE_LZ4 |
| /* If we will remove the coredump anyway, do not compress. */ |
| if (arg_compress && !maybe_remove_external_coredump(NULL, st.st_size)) { |
| |
| _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
| _cleanup_close_ int fd_compressed = -1; |
| |
| fn_compressed = strappend(fn, COMPRESSED_EXT); |
| if (!fn_compressed) { |
| log_oom(); |
| goto uncompressed; |
| } |
| |
| fd_compressed = open_tmpfile_linkable(fn_compressed, O_RDWR|O_CLOEXEC, &tmp_compressed); |
| if (fd_compressed < 0) { |
| log_error_errno(fd_compressed, "Failed to create temporary file for coredump %s: %m", fn_compressed); |
| goto uncompressed; |
| } |
| |
| r = compress_stream(fd, fd_compressed, -1); |
| if (r < 0) { |
| log_error_errno(r, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed)); |
| goto fail_compressed; |
| } |
| |
| r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, context, uid); |
| if (r < 0) |
| goto fail_compressed; |
| |
| /* OK, this worked, we can get rid of the uncompressed version now */ |
| if (tmp) |
| unlink_noerrno(tmp); |
| |
| *ret_filename = TAKE_PTR(fn_compressed); /* compressed */ |
| *ret_node_fd = TAKE_FD(fd_compressed); /* compressed */ |
| *ret_data_fd = TAKE_FD(fd); /* uncompressed */ |
| *ret_size = (uint64_t) st.st_size; /* uncompressed */ |
| |
| return 0; |
| |
| fail_compressed: |
| if (tmp_compressed) |
| (void) unlink(tmp_compressed); |
| } |
| |
| uncompressed: |
| #endif |
| |
| r = fix_permissions(fd, tmp, fn, context, uid); |
| if (r < 0) |
| goto fail; |
| |
| *ret_filename = TAKE_PTR(fn); |
| *ret_data_fd = TAKE_FD(fd); |
| *ret_node_fd = -1; |
| *ret_size = (uint64_t) st.st_size; |
| |
| return 0; |
| |
| fail: |
| if (tmp) |
| (void) unlink(tmp); |
| return r; |
| } |
| |
| 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) { |
| log_error("Core data too short."); |
| return -EIO; |
| } |
| |
| *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 = 0; |
| |
| 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(&buffer, &size); |
| if (!stream) |
| return -ENOMEM; |
| |
| (void) __fsetlocking(stream, FSETLOCKING_BYCALLER); |
| |
| FOREACH_DIRENT(dent, proc_fd_dir, return -errno) { |
| _cleanup_fclose_ FILE *fdinfo = NULL; |
| _cleanup_free_ char *fdname = NULL; |
| char line[LINE_MAX]; |
| int fd; |
| |
| 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 = fdopen(fd, "re"); |
| if (!fdinfo) { |
| safe_close(fd); |
| continue; |
| } |
| |
| FOREACH_LINE(line, fdinfo, break) { |
| fputs(line, stream); |
| if (!endswith(line, "\n")) |
| 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; |
| |
| 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 *container_pid) { |
| pid_t cpid = pid, ppid = 0; |
| ino_t proc_mntns; |
| int r = 0; |
| |
| r = get_process_ns(pid, "mnt", &proc_mntns); |
| if (r < 0) |
| return r; |
| |
| for (;;) { |
| ino_t parent_mntns; |
| |
| r = get_process_ppid(cpid, &ppid); |
| if (r < 0) |
| return r; |
| |
| r = get_process_ns(ppid, "mnt", &parent_mntns); |
| if (r < 0) |
| return r; |
| |
| if (proc_mntns != parent_mntns) |
| break; |
| |
| if (ppid == 1) |
| return -ENOENT; |
| |
| cpid = ppid; |
| } |
| |
| *container_pid = ppid; |
| return 0; |
| } |
| |
| /* 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, 0, false, cmdline); |
| if (r < 0) |
| return r; |
| |
| return 1; |
| } |
| |
| static int change_uid_gid(const char *context[]) { |
| uid_t uid; |
| gid_t gid; |
| int r; |
| |
| r = parse_uid(context[CONTEXT_UID], &uid); |
| if (r < 0) |
| return r; |
| |
| if (uid <= SYSTEM_UID_MAX) { |
| const char *user = "systemd-coredump"; |
| |
| r = get_user_creds(&user, &uid, &gid, NULL, NULL); |
| 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[CONTEXT_GID], &gid); |
| if (r < 0) |
| return r; |
| } |
| |
| return drop_privileges(uid, gid, 0); |
| } |
| |
| static bool is_journald_crash(const char *context[_CONTEXT_MAX]) { |
| assert(context); |
| |
| return streq_ptr(context[CONTEXT_UNIT], SPECIAL_JOURNALD_SERVICE); |
| } |
| |
| static bool is_pid1_crash(const char *context[_CONTEXT_MAX]) { |
| assert(context); |
| |
| return streq_ptr(context[CONTEXT_UNIT], SPECIAL_INIT_SCOPE) || |
| streq_ptr(context[CONTEXT_PID], "1"); |
| } |
| |
| #define SUBMIT_COREDUMP_FIELDS 4 |
| |
| static int submit_coredump( |
| const char *context[_CONTEXT_MAX], |
| struct iovec *iovec, |
| size_t n_iovec_allocated, |
| size_t n_iovec, |
| int input_fd) { |
| |
| _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1; |
| _cleanup_free_ char *core_message = NULL, *filename = NULL, *coredump_data = NULL; |
| uint64_t coredump_size = UINT64_MAX; |
| bool truncated = false, journald_crash; |
| int r; |
| |
| assert(context); |
| assert(iovec); |
| assert(n_iovec_allocated >= n_iovec + SUBMIT_COREDUMP_FIELDS); |
| assert(input_fd >= 0); |
| |
| journald_crash = is_journald_crash(context); |
| |
| /* 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, &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_size); |
| if (r < 0) |
| return r; |
| if (r == 0) { |
| const char *coredump_filename; |
| |
| coredump_filename = strjoina("COREDUMP_FILENAME=", filename); |
| iovec[n_iovec++] = IOVEC_MAKE_STRING(coredump_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_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 strack trace if we can */ |
| if (coredump_size <= arg_process_size_max) { |
| _cleanup_free_ char *stacktrace = NULL; |
| |
| r = coredump_make_stack_trace(coredump_fd, context[CONTEXT_EXE], &stacktrace); |
| if (r >= 0) |
| core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], |
| " (", context[CONTEXT_COMM], ") of user ", |
| context[CONTEXT_UID], " dumped core.", |
| journald_crash ? "\nCoredump diverted to " : "", |
| journald_crash ? filename : "", |
| "\n\n", stacktrace); |
| else if (r == -EINVAL) |
| log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno())); |
| else |
| log_warning_errno(r, "Failed to generate stack trace: %m"); |
| } else |
| log_debug("Not generating stack trace: core size %"PRIu64" is greater than %"PRIu64" (the configured maximum)", |
| coredump_size, arg_process_size_max); |
| |
| if (!core_message) |
| #endif |
| log: |
| core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], |
| " (", context[CONTEXT_COMM], ") of user ", |
| context[CONTEXT_UID], " dumped core.", |
| journald_crash && filename ? "\nCoredump diverted to " : NULL, |
| journald_crash && filename ? filename : NULL); |
| if (!core_message) |
| return log_oom(); |
| |
| if (journald_crash) { |
| /* We cannot log to the journal, so just print the message. |
| * The target was set previously to something safe. */ |
| assert(startswith(core_message, "MESSAGE=")); |
| log_dispatch(LOG_ERR, 0, core_message + strlen("MESSAGE=")); |
| return 0; |
| } |
| |
| iovec[n_iovec++] = IOVEC_MAKE_STRING(core_message); |
| |
| if (truncated) |
| iovec[n_iovec++] = IOVEC_MAKE_STRING("COREDUMP_TRUNCATED=1"); |
| |
| /* Optionally store the entire coredump in the journal */ |
| if (arg_storage == COREDUMP_STORAGE_JOURNAL) { |
| 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) |
| iovec[n_iovec++] = IOVEC_MAKE(coredump_data, sz); |
| 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); |
| } |
| |
| assert(n_iovec <= n_iovec_allocated); |
| |
| r = sd_journal_sendv(iovec, n_iovec); |
| if (r < 0) |
| return log_error_errno(r, "Failed to log coredump: %m"); |
| |
| return 0; |
| } |
| |
| static void map_context_fields(const struct iovec *iovec, const char* context[]) { |
| |
| static const char * const context_field_names[] = { |
| [CONTEXT_PID] = "COREDUMP_PID=", |
| [CONTEXT_UID] = "COREDUMP_UID=", |
| [CONTEXT_GID] = "COREDUMP_GID=", |
| [CONTEXT_SIGNAL] = "COREDUMP_SIGNAL=", |
| [CONTEXT_TIMESTAMP] = "COREDUMP_TIMESTAMP=", |
| [CONTEXT_RLIMIT] = "COREDUMP_RLIMIT=", |
| [CONTEXT_HOSTNAME] = "COREDUMP_HOSTNAME=", |
| [CONTEXT_COMM] = "COREDUMP_COMM=", |
| [CONTEXT_EXE] = "COREDUMP_EXE=", |
| }; |
| |
| unsigned i; |
| |
| assert(iovec); |
| assert(context); |
| |
| for (i = 0; i < ELEMENTSOF(context_field_names); i++) { |
| char *p; |
| |
| if (!context_field_names[i]) |
| continue; |
| |
| p = memory_startswith(iovec->iov_base, iovec->iov_len, context_field_names[i]); |
| if (!p) |
| continue; |
| |
| /* 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 below) */ |
| context[i] = p; |
| break; |
| } |
| } |
| |
| static int process_socket(int fd) { |
| _cleanup_close_ int coredump_fd = -1; |
| struct iovec *iovec = NULL; |
| size_t n_iovec = 0, n_allocated = 0, i, k; |
| const char *context[_CONTEXT_MAX] = {}; |
| int r; |
| |
| assert(fd >= 0); |
| |
| log_set_target(LOG_TARGET_AUTO); |
| log_parse_environment(); |
| log_open(); |
| |
| log_debug("Processing coredump received on stdin..."); |
| |
| for (;;) { |
| union { |
| struct cmsghdr cmsghdr; |
| uint8_t buf[CMSG_SPACE(sizeof(int))]; |
| } control = {}; |
| struct msghdr mh = { |
| .msg_control = &control, |
| .msg_controllen = sizeof(control), |
| .msg_iovlen = 1, |
| }; |
| ssize_t n; |
| ssize_t l; |
| |
| if (!GREEDY_REALLOC(iovec, n_allocated, n_iovec + SUBMIT_COREDUMP_FIELDS)) { |
| r = log_oom(); |
| goto finish; |
| } |
| |
| l = next_datagram_size_fd(fd); |
| if (l < 0) { |
| r = log_error_errno(l, "Failed to determine datagram size to read: %m"); |
| goto finish; |
| } |
| |
| assert(l >= 0); |
| |
| iovec[n_iovec].iov_len = l; |
| iovec[n_iovec].iov_base = malloc(l + 1); |
| if (!iovec[n_iovec].iov_base) { |
| r = log_oom(); |
| goto finish; |
| } |
| |
| mh.msg_iov = iovec + n_iovec; |
| |
| n = recvmsg(fd, &mh, MSG_CMSG_CLOEXEC); |
| if (n < 0) { |
| free(iovec[n_iovec].iov_base); |
| r = log_error_errno(errno, "Failed to receive datagram: %m"); |
| goto finish; |
| } |
| |
| if (n == 0) { |
| struct cmsghdr *cmsg, *found = NULL; |
| /* The final zero-length datagram carries the file descriptor and tells us that we're done. */ |
| |
| free(iovec[n_iovec].iov_base); |
| |
| CMSG_FOREACH(cmsg, &mh) { |
| if (cmsg->cmsg_level == SOL_SOCKET && |
| cmsg->cmsg_type == SCM_RIGHTS && |
| cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { |
| assert(!found); |
| found = cmsg; |
| } |
| } |
| |
| if (!found) { |
| log_error("Coredump file descriptor missing."); |
| r = -EBADMSG; |
| goto finish; |
| } |
| |
| assert(coredump_fd < 0); |
| coredump_fd = *(int*) CMSG_DATA(found); |
| break; |
| } |
| |
| /* Add trailing NUL byte, in case these are strings */ |
| ((char*) iovec[n_iovec].iov_base)[n] = 0; |
| iovec[n_iovec].iov_len = (size_t) n; |
| |
| cmsg_close_all(&mh); |
| map_context_fields(iovec + n_iovec, context); |
| n_iovec++; |
| } |
| |
| if (!GREEDY_REALLOC(iovec, n_allocated, n_iovec + SUBMIT_COREDUMP_FIELDS)) { |
| r = log_oom(); |
| goto finish; |
| } |
| |
| /* Make sure we got all data we really need */ |
| assert(context[CONTEXT_PID]); |
| assert(context[CONTEXT_UID]); |
| assert(context[CONTEXT_GID]); |
| assert(context[CONTEXT_SIGNAL]); |
| assert(context[CONTEXT_TIMESTAMP]); |
| assert(context[CONTEXT_RLIMIT]); |
| assert(context[CONTEXT_HOSTNAME]); |
| assert(context[CONTEXT_COMM]); |
| assert(coredump_fd >= 0); |
| |
| /* Small quirk: 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. Since we |
| * are reconstructing the original kernel context, we chop this off again, here. */ |
| k = strlen(context[CONTEXT_TIMESTAMP]); |
| if (k > 6) |
| context[CONTEXT_TIMESTAMP] = strndupa(context[CONTEXT_TIMESTAMP], k - 6); |
| |
| r = submit_coredump(context, iovec, n_allocated, n_iovec, coredump_fd); |
| |
| finish: |
| for (i = 0; i < n_iovec; i++) |
| free(iovec[i].iov_base); |
| free(iovec); |
| |
| return r; |
| } |
| |
| static int send_iovec(const struct iovec iovec[], size_t n_iovec, 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; |
| size_t i; |
| int r; |
| |
| assert(iovec || n_iovec <= 0); |
| 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 (i = 0; i < n_iovec; i++) { |
| struct msghdr mh = { |
| .msg_iov = (struct iovec*) 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] = iovec[i]; |
| copy[1] = (struct iovec) { |
| .iov_base = (char[]) { '.', '.', '.' }, |
| .iov_len = 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 char* set_iovec_field_free(struct iovec *iovec, size_t *n_iovec, const char *field, char *value) { |
| char *x; |
| |
| x = set_iovec_string_field(iovec, n_iovec, field, value); |
| free(value); |
| return x; |
| } |
| |
| static int gather_pid_metadata( |
| char* context[_CONTEXT_MAX], |
| char **comm_fallback, |
| struct iovec *iovec, size_t *n_iovec) { |
| |
| /* We need 27 empty slots in iovec! |
| * |
| * 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 n_iovec fields initialized.) */ |
| |
| uid_t owner_uid; |
| pid_t pid; |
| char *t; |
| const char *p; |
| int r, signo; |
| |
| r = parse_pid(context[CONTEXT_PID], &pid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse PID \"%s\": %m", context[CONTEXT_PID]); |
| |
| r = get_process_comm(pid, &context[CONTEXT_COMM]); |
| if (r < 0) { |
| log_warning_errno(r, "Failed to get COMM, falling back to the command line: %m"); |
| context[CONTEXT_COMM] = strv_join(comm_fallback, " "); |
| if (!context[CONTEXT_COMM]) |
| return log_oom(); |
| } |
| |
| r = get_process_exe(pid, &context[CONTEXT_EXE]); |
| if (r < 0) |
| log_warning_errno(r, "Failed to get EXE, ignoring: %m"); |
| |
| if (cg_pid_get_unit(pid, &context[CONTEXT_UNIT]) >= 0) { |
| if (!is_journald_crash((const char**) context)) { |
| /* 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. */ |
| if (is_pid1_crash((const char**) context)) { |
| log_notice("Due to PID 1 having crashed coredump collection will now be turned off."); |
| disable_coredumps(); |
| } |
| |
| set_iovec_string_field(iovec, n_iovec, "COREDUMP_UNIT=", context[CONTEXT_UNIT]); |
| } |
| |
| if (cg_pid_get_user_unit(pid, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_USER_UNIT=", t); |
| |
| /* The next few are mandatory */ |
| if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_PID=", context[CONTEXT_PID])) |
| return log_oom(); |
| |
| if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_UID=", context[CONTEXT_UID])) |
| return log_oom(); |
| |
| if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_GID=", context[CONTEXT_GID])) |
| return log_oom(); |
| |
| if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_SIGNAL=", context[CONTEXT_SIGNAL])) |
| return log_oom(); |
| |
| if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_RLIMIT=", context[CONTEXT_RLIMIT])) |
| return log_oom(); |
| |
| if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_HOSTNAME=", context[CONTEXT_HOSTNAME])) |
| return log_oom(); |
| |
| if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_COMM=", context[CONTEXT_COMM])) |
| return log_oom(); |
| |
| if (context[CONTEXT_EXE] && |
| !set_iovec_string_field(iovec, n_iovec, "COREDUMP_EXE=", context[CONTEXT_EXE])) |
| return log_oom(); |
| |
| if (sd_pid_get_session(pid, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_SESSION=", t); |
| |
| if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
| r = asprintf(&t, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); |
| if (r > 0) |
| iovec[(*n_iovec)++] = IOVEC_MAKE_STRING(t); |
| } |
| |
| if (sd_pid_get_slice(pid, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_SLICE=", t); |
| |
| if (get_process_cmdline(pid, 0, false, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_CMDLINE=", t); |
| |
| if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_CGROUP=", t); |
| |
| if (compose_open_fds(pid, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_OPEN_FDS=", t); |
| |
| p = procfs_file_alloca(pid, "status"); |
| if (read_full_file(p, &t, NULL) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_STATUS=", t); |
| |
| p = procfs_file_alloca(pid, "maps"); |
| if (read_full_file(p, &t, NULL) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_MAPS=", t); |
| |
| p = procfs_file_alloca(pid, "limits"); |
| if (read_full_file(p, &t, NULL) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_LIMITS=", t); |
| |
| p = procfs_file_alloca(pid, "cgroup"); |
| if (read_full_file(p, &t, NULL) >=0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_CGROUP=", t); |
| |
| p = procfs_file_alloca(pid, "mountinfo"); |
| if (read_full_file(p, &t, NULL) >=0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_MOUNTINFO=", t); |
| |
| if (get_process_cwd(pid, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_CWD=", t); |
| |
| if (get_process_root(pid, &t) >= 0) { |
| bool proc_self_root_is_slash; |
| |
| proc_self_root_is_slash = strcmp(t, "/") == 0; |
| |
| set_iovec_field_free(iovec, n_iovec, "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) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_CONTAINER_CMDLINE=", t); |
| } |
| |
| if (get_process_environ(pid, &t) >= 0) |
| set_iovec_field_free(iovec, n_iovec, "COREDUMP_ENVIRON=", t); |
| |
| t = strjoin("COREDUMP_TIMESTAMP=", context[CONTEXT_TIMESTAMP], "000000"); |
| if (t) |
| iovec[(*n_iovec)++] = IOVEC_MAKE_STRING(t); |
| |
| if (safe_atoi(context[CONTEXT_SIGNAL], &signo) >= 0 && SIGNAL_VALID(signo)) |
| set_iovec_string_field(iovec, n_iovec, "COREDUMP_SIGNAL_NAME=SIG", signal_to_string(signo)); |
| |
| return 0; /* we successfully acquired all metadata */ |
| } |
| |
| static int process_kernel(int argc, char* argv[]) { |
| |
| char* context[_CONTEXT_MAX] = {}; |
| struct iovec iovec[29 + SUBMIT_COREDUMP_FIELDS]; |
| size_t i, n_iovec, n_to_free = 0; |
| int r; |
| |
| log_debug("Processing coredump received from the kernel..."); |
| |
| if (argc < CONTEXT_COMM + 1) { |
| log_error("Not enough arguments passed by the kernel (%i, expected %i).", argc - 1, CONTEXT_COMM + 1 - 1); |
| return -EINVAL; |
| } |
| |
| context[CONTEXT_PID] = argv[1 + CONTEXT_PID]; |
| context[CONTEXT_UID] = argv[1 + CONTEXT_UID]; |
| context[CONTEXT_GID] = argv[1 + CONTEXT_GID]; |
| context[CONTEXT_SIGNAL] = argv[1 + CONTEXT_SIGNAL]; |
| context[CONTEXT_TIMESTAMP] = argv[1 + CONTEXT_TIMESTAMP]; |
| context[CONTEXT_RLIMIT] = argv[1 + CONTEXT_RLIMIT]; |
| context[CONTEXT_HOSTNAME] = argv[1 + CONTEXT_HOSTNAME]; |
| |
| r = gather_pid_metadata(context, argv + 1 + CONTEXT_COMM, iovec, &n_to_free); |
| if (r < 0) |
| goto finish; |
| |
| n_iovec = n_to_free; |
| |
| iovec[n_iovec++] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_COREDUMP_STR); |
| |
| assert_cc(2 == LOG_CRIT); |
| iovec[n_iovec++] = IOVEC_MAKE_STRING("PRIORITY=2"); |
| |
| assert(n_iovec <= ELEMENTSOF(iovec)); |
| |
| if (is_journald_crash((const char**) context) || is_pid1_crash((const char**) context)) |
| r = submit_coredump((const char**) context, |
| iovec, ELEMENTSOF(iovec), n_iovec, |
| STDIN_FILENO); |
| else |
| r = send_iovec(iovec, n_iovec, STDIN_FILENO); |
| |
| finish: |
| for (i = 0; i < n_to_free; i++) |
| free(iovec[i].iov_base); |
| |
| /* Those fields are allocated by gather_pid_metadata */ |
| free(context[CONTEXT_COMM]); |
| free(context[CONTEXT_EXE]); |
| free(context[CONTEXT_UNIT]); |
| |
| return r; |
| } |
| |
| static int process_backtrace(int argc, char *argv[]) { |
| char *context[_CONTEXT_MAX] = {}; |
| _cleanup_free_ char *message = NULL; |
| _cleanup_free_ struct iovec *iovec = NULL; |
| size_t n_iovec, n_allocated, n_to_free = 0, i; |
| int r; |
| JournalImporter importer = { |
| .fd = STDIN_FILENO, |
| }; |
| |
| log_debug("Processing backtrace on stdin..."); |
| |
| if (argc < CONTEXT_COMM + 1) { |
| log_error("Not enough arguments passed (%i, expected %i).", argc - 1, CONTEXT_COMM + 1 - 1); |
| return -EINVAL; |
| } |
| |
| context[CONTEXT_PID] = argv[2 + CONTEXT_PID]; |
| context[CONTEXT_UID] = argv[2 + CONTEXT_UID]; |
| context[CONTEXT_GID] = argv[2 + CONTEXT_GID]; |
| context[CONTEXT_SIGNAL] = argv[2 + CONTEXT_SIGNAL]; |
| context[CONTEXT_TIMESTAMP] = argv[2 + CONTEXT_TIMESTAMP]; |
| context[CONTEXT_RLIMIT] = argv[2 + CONTEXT_RLIMIT]; |
| context[CONTEXT_HOSTNAME] = argv[2 + CONTEXT_HOSTNAME]; |
| |
| n_allocated = 34 + COREDUMP_STORAGE_EXTERNAL; |
| /* 26 metadata, 2 static, +unknown input, 4 storage, rounded up */ |
| iovec = new(struct iovec, n_allocated); |
| if (!iovec) |
| return log_oom(); |
| |
| r = gather_pid_metadata(context, argv + 2 + CONTEXT_COMM, iovec, &n_to_free); |
| if (r < 0) |
| goto finish; |
| if (r > 0) { |
| /* This was a special crash, and has already been processed. */ |
| r = 0; |
| goto finish; |
| } |
| n_iovec = n_to_free; |
| |
| 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 (!GREEDY_REALLOC(iovec, n_allocated, n_iovec + importer.iovw.count + 2)) |
| return log_oom(); |
| |
| if (journal_importer_eof(&importer)) { |
| log_warning("Did not receive a full journal entry on stdin, ignoring message sent by reporter"); |
| |
| message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], |
| " (", context[CONTEXT_COMM], ")" |
| " of user ", context[CONTEXT_UID], |
| " failed with ", context[CONTEXT_SIGNAL]); |
| if (!message) { |
| r = log_oom(); |
| goto finish; |
| } |
| iovec[n_iovec++] = IOVEC_MAKE_STRING(message); |
| } else { |
| for (i = 0; i < importer.iovw.count; i++) |
| iovec[n_iovec++] = importer.iovw.iovec[i]; |
| } |
| |
| iovec[n_iovec++] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_BACKTRACE_STR); |
| assert_cc(2 == LOG_CRIT); |
| iovec[n_iovec++] = IOVEC_MAKE_STRING("PRIORITY=2"); |
| |
| assert(n_iovec <= n_allocated); |
| |
| r = sd_journal_sendv(iovec, n_iovec); |
| if (r < 0) |
| log_error_errno(r, "Failed to log backtrace: %m"); |
| |
| finish: |
| for (i = 0; i < n_to_free; i++) |
| free(iovec[i].iov_base); |
| |
| /* Those fields are allocated by gather_pid_metadata */ |
| free(context[CONTEXT_COMM]); |
| free(context[CONTEXT_EXE]); |
| free(context[CONTEXT_UNIT]); |
| |
| return r; |
| } |
| |
| int main(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) { |
| log_error_errno(r, "Failed to determine number of file descriptor: %m"); |
| goto finish; |
| } |
| |
| /* 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")) |
| r = process_backtrace(argc, argv); |
| else |
| r = process_kernel(argc, argv); |
| } else if (r == 1) |
| r = process_socket(SD_LISTEN_FDS_START); |
| else { |
| log_error("Received unexpected number of file descriptors."); |
| r = -EINVAL; |
| } |
| |
| finish: |
| return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |