| /*** |
| This file is part of systemd. |
| |
| Copyright 2012 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <sys/prctl.h> |
| #include <sys/xattr.h> |
| #include <unistd.h> |
| |
| #ifdef HAVE_ELFUTILS |
| #include <dwarf.h> |
| #include <elfutils/libdwfl.h> |
| #endif |
| |
| #include "sd-journal.h" |
| #include "sd-login.h" |
| #include "sd-daemon.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 "journald-native.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "missing.h" |
| #include "mkdir.h" |
| #include "parse-util.h" |
| #include "process-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 coredumping files, and |
| * attaching xattrs */ |
| CONTEXT_PID, |
| CONTEXT_UID, |
| CONTEXT_GID, |
| CONTEXT_SIGNAL, |
| CONTEXT_TIMESTAMP, |
| CONTEXT_RLIMIT, |
| CONTEXT_COMM, |
| CONTEXT_EXE, |
| _CONTEXT_MAX |
| }; |
| |
| typedef enum CoredumpStorage { |
| COREDUMP_STORAGE_NONE, |
| COREDUMP_STORAGE_EXTERNAL, |
| COREDUMP_STORAGE_JOURNAL, |
| COREDUMP_STORAGE_BOTH, |
| _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", |
| [COREDUMP_STORAGE_BOTH] = "both", |
| }; |
| |
| 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 size_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(PKGSYSCONFDIR "/coredump.conf", |
| CONF_PATHS_NULSTR("systemd/coredump.conf.d"), |
| "Coredump\0", |
| config_item_table_lookup, items, |
| false, NULL); |
| } |
| |
| static int fix_acl(int fd, uid_t uid) { |
| |
| #ifdef HAVE_ACL |
| _cleanup_(acl_freep) acl_t acl = NULL; |
| acl_entry_t entry; |
| acl_permset_t permset; |
| int r; |
| |
| assert(fd >= 0); |
| |
| if (uid <= SYSTEM_UID_MAX) |
| 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_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)); |
| |
| 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 (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && |
| 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) { |
| |
| _cleanup_free_ char *fn = NULL, *tmp = NULL; |
| _cleanup_close_ int fd = -1; |
| uint64_t rlimit, 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 <= 0) { |
| /* Is coredumping disabled? Then don't bother saving/processing the coredump */ |
| log_info("Core Dumping has been disabled for process %s (%s).", context[CONTEXT_PID], context[CONTEXT_COMM]); |
| return -EBADSLT; |
| } |
| |
| /* Never store more than the process configured, or than we actually shall keep or process */ |
| max_size = MIN(rlimit, MAX(arg_process_size_max, arg_external_size_max)); |
| |
| 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, false); |
| if (r == -EFBIG) { |
| log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", context[CONTEXT_PID], context[CONTEXT_COMM]); |
| goto fail; |
| } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { |
| log_error("Not enough disk space for coredump of %s (%s), refusing.", context[CONTEXT_PID], context[CONTEXT_COMM]); |
| goto fail; |
| } else if (r < 0) { |
| log_error_errno(r, "Failed to dump coredump to file: %m"); |
| goto fail; |
| } |
| |
| if (fstat(fd, &st) < 0) { |
| log_error_errno(errno, "Failed to fstat coredump %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 defined(HAVE_XZ) || defined(HAVE_LZ4) |
| /* If we will remove the coredump anyway, do not compress. */ |
| if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
| && arg_compress) { |
| |
| _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 = fn_compressed; /* compressed */ |
| *ret_node_fd = fd_compressed; /* compressed */ |
| *ret_data_fd = fd; /* uncompressed */ |
| *ret_size = (uint64_t) st.st_size; /* uncompressed */ |
| |
| fn_compressed = NULL; |
| fd = fd_compressed = -1; |
| |
| 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 = fn; |
| *ret_data_fd = fd; |
| *ret_node_fd = -1; |
| *ret_size = (uint64_t) st.st_size; |
| |
| fn = NULL; |
| fd = -1; |
| |
| 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 = field; |
| *ret_size = size + 9; |
| |
| field = NULL; |
| |
| 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; |
| |
| 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 == NULL) { |
| 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 = buffer; |
| buffer = NULL; |
| |
| return 0; |
| } |
| |
| 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 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; |
| int r; |
| |
| assert(context); |
| assert(iovec); |
| assert(n_iovec_allocated >= n_iovec + 3); |
| 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); |
| 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_SET_STRING(iovec[n_iovec++], coredump_filename); |
| } |
| |
| /* 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"); |
| |
| #ifdef 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.\n\n", stacktrace, NULL); |
| 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"); |
| } |
| |
| if (!core_message) |
| #endif |
| log: |
| core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], " (", context[CONTEXT_COMM], ") of user ", context[CONTEXT_UID], " dumped core.", NULL); |
| if (core_message) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_message); |
| |
| /* Optionally store the entire coredump in the journal */ |
| if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && |
| 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].iov_base = coredump_data; |
| iovec[n_iovec].iov_len = sz; |
| n_iovec++; |
| } |
| } |
| |
| 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_MAX] = { |
| [CONTEXT_PID] = "COREDUMP_PID=", |
| [CONTEXT_UID] = "COREDUMP_UID=", |
| [CONTEXT_GID] = "COREDUMP_GID=", |
| [CONTEXT_SIGNAL] = "COREDUMP_SIGNAL=", |
| [CONTEXT_TIMESTAMP] = "COREDUMP_TIMESTAMP=", |
| [CONTEXT_COMM] = "COREDUMP_COMM=", |
| [CONTEXT_EXE] = "COREDUMP_EXE=", |
| [CONTEXT_RLIMIT] = "COREDUMP_RLIMIT=", |
| }; |
| |
| unsigned i; |
| |
| assert(iovec); |
| assert(context); |
| |
| for (i = 0; i < _CONTEXT_MAX; i++) { |
| size_t l; |
| |
| l = strlen(context_field_names[i]); |
| if (iovec->iov_len < l) |
| continue; |
| |
| if (memcmp(iovec->iov_base, context_field_names[i], l) != 0) |
| 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] = (char*) iovec->iov_base + l; |
| break; |
| } |
| } |
| |
| static int process_socket(int fd) { |
| _cleanup_close_ int coredump_fd = -1; |
| struct iovec *iovec = NULL; |
| size_t n_iovec = 0, n_iovec_allocated = 0, i; |
| const char *context[_CONTEXT_MAX] = {}; |
| int r; |
| |
| assert(fd >= 0); |
| |
| log_set_target(LOG_TARGET_AUTO); |
| log_parse_environment(); |
| log_open(); |
| |
| 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_iovec_allocated, n_iovec + 3)) { |
| 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_NOSIGNAL|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_iovec_allocated, n_iovec + 3)) { |
| 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_COMM]); |
| assert(coredump_fd >= 0); |
| |
| r = submit_coredump(context, iovec, n_iovec_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 int process_special_crash(const char *context[], int input_fd) { |
| _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1; |
| _cleanup_free_ char *filename = NULL; |
| uint64_t coredump_size; |
| int r; |
| |
| assert(context); |
| assert(input_fd >= 0); |
| |
| /* If we are pid1 or journald, we cut things short, don't write to the journal, but still create a coredump. */ |
| |
| if (arg_storage != COREDUMP_STORAGE_NONE) |
| arg_storage = COREDUMP_STORAGE_EXTERNAL; |
| |
| r = save_external_coredump(context, input_fd, &filename, &coredump_node_fd, &coredump_fd, &coredump_size); |
| if (r < 0) |
| return r; |
| |
| r = maybe_remove_external_coredump(filename, coredump_size); |
| if (r < 0) |
| return r; |
| |
| log_notice("Detected coredump of the journal daemon or PID 1, diverted to %s.", filename); |
| |
| return 0; |
| } |
| |
| static int process_kernel(int argc, char* argv[]) { |
| |
| /* The small core field we allocate on the stack, to keep things simple */ |
| char |
| *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, |
| *core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL, |
| *core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL, |
| *core_user_unit = NULL, *core_slice = NULL, *core_timestamp = NULL, *core_rlimit = NULL; |
| |
| /* The larger ones we allocate on the heap */ |
| _cleanup_free_ char |
| *core_owner_uid = NULL, *core_open_fds = NULL, *core_proc_status = NULL, |
| *core_proc_maps = NULL, *core_proc_limits = NULL, *core_proc_cgroup = NULL, *core_environ = NULL; |
| |
| _cleanup_free_ char *exe = NULL, *comm = NULL; |
| const char *context[_CONTEXT_MAX]; |
| struct iovec iovec[25]; |
| size_t n_iovec = 0; |
| uid_t owner_uid; |
| const char *p; |
| pid_t pid; |
| char *t; |
| int r; |
| |
| if (argc < CONTEXT_COMM + 1) { |
| log_error("Not enough arguments passed from kernel (%i, expected %i).", argc - 1, CONTEXT_COMM + 1 - 1); |
| return -EINVAL; |
| } |
| |
| r = parse_pid(argv[CONTEXT_PID + 1], &pid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse PID."); |
| |
| r = get_process_comm(pid, &comm); |
| if (r < 0) { |
| log_warning_errno(r, "Failed to get COMM, falling back to the command line: %m"); |
| comm = strv_join(argv + CONTEXT_COMM + 1, " "); |
| if (!comm) |
| return log_oom(); |
| } |
| |
| r = get_process_exe(pid, &exe); |
| if (r < 0) |
| log_warning_errno(r, "Failed to get EXE, ignoring: %m"); |
| |
| context[CONTEXT_PID] = argv[CONTEXT_PID + 1]; |
| context[CONTEXT_UID] = argv[CONTEXT_UID + 1]; |
| context[CONTEXT_GID] = argv[CONTEXT_GID + 1]; |
| context[CONTEXT_SIGNAL] = argv[CONTEXT_SIGNAL + 1]; |
| context[CONTEXT_TIMESTAMP] = argv[CONTEXT_TIMESTAMP + 1]; |
| context[CONTEXT_RLIMIT] = argv[CONTEXT_RLIMIT + 1]; |
| context[CONTEXT_COMM] = comm; |
| context[CONTEXT_EXE] = exe; |
| |
| if (cg_pid_get_unit(pid, &t) >= 0) { |
| |
| /* If this is PID 1 disable coredump collection, we'll unlikely be able to process it later on. */ |
| if (streq(t, SPECIAL_INIT_SCOPE)) { |
| log_notice("Due to PID 1 having crashed coredump collection will now be turned off."); |
| (void) write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", 0); |
| } |
| |
| /* Let's avoid dead-locks when processing journald and init crashes, as socket activation and logging |
| * are unlikely to work then. */ |
| if (STR_IN_SET(t, SPECIAL_JOURNALD_SERVICE, SPECIAL_INIT_SCOPE)) { |
| free(t); |
| return process_special_crash(context, STDIN_FILENO); |
| } |
| |
| core_unit = strjoina("COREDUMP_UNIT=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_unit); |
| } |
| |
| /* 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 (cg_pid_get_user_unit(pid, &t) >= 0) { |
| core_user_unit = strjoina("COREDUMP_USER_UNIT=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_user_unit); |
| } |
| |
| core_pid = strjoina("COREDUMP_PID=", context[CONTEXT_PID]); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_pid); |
| |
| core_uid = strjoina("COREDUMP_UID=", context[CONTEXT_UID]); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_uid); |
| |
| core_gid = strjoina("COREDUMP_GID=", context[CONTEXT_GID]); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_gid); |
| |
| core_signal = strjoina("COREDUMP_SIGNAL=", context[CONTEXT_SIGNAL]); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_signal); |
| |
| core_rlimit = strjoina("COREDUMP_RLIMIT=", context[CONTEXT_RLIMIT]); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_rlimit); |
| |
| if (sd_pid_get_session(pid, &t) >= 0) { |
| core_session = strjoina("COREDUMP_SESSION=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_session); |
| } |
| |
| if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
| r = asprintf(&core_owner_uid, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); |
| if (r > 0) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_owner_uid); |
| } |
| |
| if (sd_pid_get_slice(pid, &t) >= 0) { |
| core_slice = strjoina("COREDUMP_SLICE=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_slice); |
| } |
| |
| if (comm) { |
| core_comm = strjoina("COREDUMP_COMM=", comm); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_comm); |
| } |
| |
| if (exe) { |
| core_exe = strjoina("COREDUMP_EXE=", exe); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_exe); |
| } |
| |
| if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
| core_cmdline = strjoina("COREDUMP_CMDLINE=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_cmdline); |
| } |
| |
| if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
| core_cgroup = strjoina("COREDUMP_CGROUP=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_cgroup); |
| } |
| |
| if (compose_open_fds(pid, &t) >= 0) { |
| core_open_fds = strappend("COREDUMP_OPEN_FDS=", t); |
| free(t); |
| |
| if (core_open_fds) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_open_fds); |
| } |
| |
| p = procfs_file_alloca(pid, "status"); |
| if (read_full_file(p, &t, NULL) >= 0) { |
| core_proc_status = strappend("COREDUMP_PROC_STATUS=", t); |
| free(t); |
| |
| if (core_proc_status) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_proc_status); |
| } |
| |
| p = procfs_file_alloca(pid, "maps"); |
| if (read_full_file(p, &t, NULL) >= 0) { |
| core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t); |
| free(t); |
| |
| if (core_proc_maps) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_proc_maps); |
| } |
| |
| p = procfs_file_alloca(pid, "limits"); |
| if (read_full_file(p, &t, NULL) >= 0) { |
| core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t); |
| free(t); |
| |
| if (core_proc_limits) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_proc_limits); |
| } |
| |
| p = procfs_file_alloca(pid, "cgroup"); |
| if (read_full_file(p, &t, NULL) >=0) { |
| core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t); |
| free(t); |
| |
| if (core_proc_cgroup) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_proc_cgroup); |
| } |
| |
| if (get_process_cwd(pid, &t) >= 0) { |
| core_cwd = strjoina("COREDUMP_CWD=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_cwd); |
| } |
| |
| if (get_process_root(pid, &t) >= 0) { |
| core_root = strjoina("COREDUMP_ROOT=", t); |
| free(t); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], core_root); |
| } |
| |
| if (get_process_environ(pid, &t) >= 0) { |
| core_environ = strappend("COREDUMP_ENVIRON=", t); |
| free(t); |
| |
| if (core_environ) |
| IOVEC_SET_STRING(iovec[n_iovec++], core_environ); |
| } |
| |
| core_timestamp = strjoina("COREDUMP_TIMESTAMP=", context[CONTEXT_TIMESTAMP], "000000"); |
| IOVEC_SET_STRING(iovec[n_iovec++], core_timestamp); |
| |
| IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); |
| |
| assert_cc(2 == LOG_CRIT); |
| IOVEC_SET_STRING(iovec[n_iovec++], "PRIORITY=2"); |
| |
| assert(n_iovec <= ELEMENTSOF(iovec)); |
| |
| return send_iovec(iovec, n_iovec, STDIN_FILENO); |
| } |
| |
| 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) |
| 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; |
| } |