diff options
Diffstat (limited to 'src/journal/coredump.c')
| -rw-r--r-- | src/journal/coredump.c | 863 |
1 files changed, 0 insertions, 863 deletions
diff --git a/src/journal/coredump.c b/src/journal/coredump.c deleted file mode 100644 index 62483a2a05..0000000000 --- a/src/journal/coredump.c +++ /dev/null @@ -1,863 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - 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 <unistd.h> -#include <stdio.h> -#include <sys/prctl.h> -#include <sys/xattr.h> - -#ifdef HAVE_ELFUTILS -# include <dwarf.h> -# include <elfutils/libdwfl.h> -#endif - -#include "sd-journal.h" -#include "sd-login.h" -#include "log.h" -#include "util.h" -#include "fileio.h" -#include "strv.h" -#include "macro.h" -#include "mkdir.h" -#include "special.h" -#include "cgroup-util.h" -#include "conf-parser.h" -#include "copy.h" -#include "stacktrace.h" -#include "compress.h" -#include "acl-util.h" -#include "capability.h" -#include "journald-native.h" -#include "coredump-vacuum.h" -#include "process-util.h" - -/* The maximum size up to which we process coredumps */ -#define PROCESS_SIZE_MAX ((off_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 { - INFO_PID, - INFO_UID, - INFO_GID, - INFO_SIGNAL, - INFO_TIMESTAMP, - INFO_COMM, - INFO_EXE, - _INFO_LEN -}; - -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 off_t arg_process_size_max = PROCESS_SIZE_MAX; -static off_t arg_external_size_max = EXTERNAL_SIZE_MAX; -static size_t arg_journal_size_max = JOURNAL_SIZE_MAX; -static off_t arg_keep_free = (off_t) -1; -static off_t arg_max_use = (off_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_off, 0, &arg_process_size_max }, - { "Coredump", "ExternalSizeMax", config_parse_iec_off, 0, &arg_external_size_max }, - { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, - { "Coredump", "KeepFree", config_parse_iec_off, 0, &arg_keep_free }, - { "Coredump", "MaxUse", config_parse_iec_off, 0, &arg_max_use }, - {} - }; - - return config_parse_many("/etc/systemd/coredump.conf", - CONF_DIRS_NULSTR("systemd/coredump.conf"), - "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; - - 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) { - log_error_errno(errno, "Failed to patch ACL: %m"); - return -errno; - } - - if (acl_get_permset(entry, &permset) < 0 || - acl_add_perm(permset, ACL_READ) < 0 || - calc_acl_mask_if_needed(&acl) < 0) { - log_warning_errno(errno, "Failed to patch ACL: %m"); - return -errno; - } - - 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 *info[_INFO_LEN]) { - - static const char * const xattrs[_INFO_LEN] = { - [INFO_PID] = "user.coredump.pid", - [INFO_UID] = "user.coredump.uid", - [INFO_GID] = "user.coredump.gid", - [INFO_SIGNAL] = "user.coredump.signal", - [INFO_TIMESTAMP] = "user.coredump.timestamp", - [INFO_COMM] = "user.coredump.comm", - [INFO_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 < _INFO_LEN; i++) { - int k; - - if (isempty(info[i]) || !xattrs[i]) - continue; - - k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); - if (k < 0 && r == 0) - r = -errno; - } - - return r; -} - -#define filename_escape(s) xescape((s), "./ ") - -static int fix_permissions( - int fd, - const char *filename, - const char *target, - const char *info[_INFO_LEN], - uid_t uid) { - - assert(fd >= 0); - assert(filename); - assert(target); - assert(info); - - /* Ignore errors on these */ - fchmod(fd, 0640); - fix_acl(fd, uid); - fix_xattr(fd, info); - - if (fsync(fd) < 0) - return log_error_errno(errno, "Failed to sync coredump %s: %m", filename); - - if (rename(filename, target) < 0) - return log_error_errno(errno, "Failed to rename coredump %s -> %s: %m", filename, target); - - return 0; -} - -static int maybe_remove_external_coredump(const char *filename, off_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 *info[_INFO_LEN], char **ret) { - _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; - sd_id128_t boot = {}; - int r; - - assert(info); - - c = filename_escape(info[INFO_COMM]); - if (!c) - return -ENOMEM; - - u = filename_escape(info[INFO_UID]); - if (!u) - return -ENOMEM; - - r = sd_id128_get_boot(&boot); - if (r < 0) - return r; - - p = filename_escape(info[INFO_PID]); - if (!p) - return -ENOMEM; - - t = filename_escape(info[INFO_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 *info[_INFO_LEN], - uid_t uid, - char **ret_filename, - int *ret_fd, - off_t *ret_size) { - - _cleanup_free_ char *fn = NULL, *tmp = NULL; - _cleanup_close_ int fd = -1; - struct stat st; - int r; - - assert(info); - assert(ret_filename); - assert(ret_fd); - assert(ret_size); - - r = make_filename(info, &fn); - if (r < 0) - return log_error_errno(r, "Failed to determine coredump file name: %m"); - - r = tempfn_random(fn, NULL, &tmp); - if (r < 0) - return log_error_errno(r, "Failed to determine temporary file name: %m"); - - mkdir_p_label("/var/lib/systemd/coredump", 0755); - - fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); - if (fd < 0) - return log_error_errno(errno, "Failed to create coredump file %s: %m", tmp); - - r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max, false); - if (r == -EFBIG) { - log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); - goto fail; - } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { - log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_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", tmp); - goto fail; - } - - if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { - log_error_errno(errno, "Failed to seek on %s: %m", 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; - } - - r = tempfn_random(fn_compressed, NULL, &tmp_compressed); - if (r < 0) { - log_error_errno(r, "Failed to determine temporary file name for %s: %m", fn_compressed); - goto uncompressed; - } - - fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); - if (fd_compressed < 0) { - log_error_errno(errno, "Failed to create file %s: %m", tmp_compressed); - goto uncompressed; - } - - r = compress_stream(fd, fd_compressed, -1); - if (r < 0) { - log_error_errno(r, "Failed to compress %s: %m", tmp_compressed); - goto fail_compressed; - } - - r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid); - if (r < 0) - goto fail_compressed; - - /* OK, this worked, we can get rid of the uncompressed version now */ - unlink_noerrno(tmp); - - *ret_filename = fn_compressed; /* compressed */ - *ret_fd = fd; /* uncompressed */ - *ret_size = st.st_size; /* uncompressed */ - - fn_compressed = NULL; - fd = -1; - - return 0; - - fail_compressed: - unlink_noerrno(tmp_compressed); - } - -uncompressed: -#endif - r = fix_permissions(fd, tmp, fn, info, uid); - if (r < 0) - goto fail; - - *ret_filename = fn; - *ret_fd = fd; - *ret_size = st.st_size; - - fn = NULL; - fd = -1; - - return 0; - -fail: - unlink_noerrno(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; - fclose(stream); - stream = NULL; - - if (errno != 0) - return -errno; - - *open_fds = buffer; - buffer = NULL; - - return 0; -} - -int main(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_slice = NULL; - - /* The larger ones we allocate on the heap */ - _cleanup_free_ char - *core_timestamp = NULL, *core_message = NULL, *coredump_data = NULL, *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, *filename = NULL; - const char *info[_INFO_LEN]; - - _cleanup_close_ int coredump_fd = -1; - - struct iovec iovec[26]; - off_t coredump_size; - int r, j = 0; - uid_t uid, owner_uid; - gid_t gid; - pid_t pid; - char *t; - const char *p; - - /* Make sure we never enter a loop */ - prctl(PR_SET_DUMPABLE, 0); - - /* 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(); - - if (argc < INFO_COMM + 1) { - log_error("Not enough arguments passed from kernel (%d, expected %d).", - argc - 1, INFO_COMM + 1 - 1); - r = -EINVAL; - goto finish; - } - - /* Ignore all parse errors */ - parse_config(); - - log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); - log_debug("Selected compression %s.", yes_no(arg_compress)); - - r = parse_uid(argv[INFO_UID + 1], &uid); - if (r < 0) { - log_error("Failed to parse UID."); - goto finish; - } - - r = parse_pid(argv[INFO_PID + 1], &pid); - if (r < 0) { - log_error("Failed to parse PID."); - goto finish; - } - - r = parse_gid(argv[INFO_GID + 1], &gid); - if (r < 0) { - log_error("Failed to parse GID."); - goto finish; - } - - if (get_process_comm(pid, &comm) < 0) { - log_warning("Failed to get COMM, falling back to the command line."); - comm = strv_join(argv + INFO_COMM + 1, " "); - } - - if (get_process_exe(pid, &exe) < 0) - log_warning("Failed to get EXE."); - - info[INFO_PID] = argv[INFO_PID + 1]; - info[INFO_UID] = argv[INFO_UID + 1]; - info[INFO_GID] = argv[INFO_GID + 1]; - info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; - info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; - info[INFO_COMM] = comm; - info[INFO_EXE] = exe; - - if (cg_pid_get_unit(pid, &t) >= 0) { - - if (streq(t, SPECIAL_JOURNALD_SERVICE)) { - free(t); - - /* If we are 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(info, uid, &filename, &coredump_fd, &coredump_size); - if (r < 0) - goto finish; - - r = maybe_remove_external_coredump(filename, coredump_size); - if (r < 0) - goto finish; - - log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); - goto finish; - } - - core_unit = strjoina("COREDUMP_UNIT=", t); - free(t); - - } else if (cg_pid_get_user_unit(pid, &t) >= 0) { - core_unit = strjoina("COREDUMP_USER_UNIT=", t); - free(t); - } - - if (core_unit) - IOVEC_SET_STRING(iovec[j++], 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(); - - core_pid = strjoina("COREDUMP_PID=", info[INFO_PID]); - IOVEC_SET_STRING(iovec[j++], core_pid); - - core_uid = strjoina("COREDUMP_UID=", info[INFO_UID]); - IOVEC_SET_STRING(iovec[j++], core_uid); - - core_gid = strjoina("COREDUMP_GID=", info[INFO_GID]); - IOVEC_SET_STRING(iovec[j++], core_gid); - - core_signal = strjoina("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); - IOVEC_SET_STRING(iovec[j++], core_signal); - - if (sd_pid_get_session(pid, &t) >= 0) { - core_session = strjoina("COREDUMP_SESSION=", t); - free(t); - - IOVEC_SET_STRING(iovec[j++], 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[j++], core_owner_uid); - } - - if (sd_pid_get_slice(pid, &t) >= 0) { - core_slice = strjoina("COREDUMP_SLICE=", t); - free(t); - - IOVEC_SET_STRING(iovec[j++], core_slice); - } - - if (comm) { - core_comm = strjoina("COREDUMP_COMM=", comm); - IOVEC_SET_STRING(iovec[j++], core_comm); - } - - if (exe) { - core_exe = strjoina("COREDUMP_EXE=", exe); - IOVEC_SET_STRING(iovec[j++], core_exe); - } - - if (get_process_cmdline(pid, 0, false, &t) >= 0) { - core_cmdline = strjoina("COREDUMP_CMDLINE=", t); - free(t); - - IOVEC_SET_STRING(iovec[j++], core_cmdline); - } - - if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { - core_cgroup = strjoina("COREDUMP_CGROUP=", t); - free(t); - - IOVEC_SET_STRING(iovec[j++], 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[j++], 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[j++], 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[j++], 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[j++], 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[j++], core_proc_cgroup); - } - - if (get_process_cwd(pid, &t) >= 0) { - core_cwd = strjoina("COREDUMP_CWD=", t); - free(t); - - IOVEC_SET_STRING(iovec[j++], core_cwd); - } - - if (get_process_root(pid, &t) >= 0) { - core_root = strjoina("COREDUMP_ROOT=", t); - free(t); - - IOVEC_SET_STRING(iovec[j++], core_root); - } - - if (get_process_environ(pid, &t) >= 0) { - core_environ = strappend("COREDUMP_ENVIRON=", t); - free(t); - - if (core_environ) - IOVEC_SET_STRING(iovec[j++], core_environ); - } - - core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); - if (core_timestamp) - IOVEC_SET_STRING(iovec[j++], core_timestamp); - - IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); - IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); - - /* Vacuum before we write anything again */ - coredump_vacuum(-1, arg_keep_free, arg_max_use); - - /* Always stream the coredump to disk, if that's possible */ - r = save_external_coredump(info, uid, &filename, &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) - goto finish; - if (r == 0) { - const char *coredump_filename; - - coredump_filename = strjoina("COREDUMP_FILENAME=", filename); - IOVEC_SET_STRING(iovec[j++], coredump_filename); - } - - /* Vacuum again, but exclude the coredump we just created */ - coredump_vacuum(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 = drop_privileges(uid, gid, 0); - if (r < 0) { - log_error_errno(r, "Failed to drop privileges: %m"); - goto finish; - } - -#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, exe, &stacktrace); - if (r >= 0) - core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_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 ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); - if (core_message) - IOVEC_SET_STRING(iovec[j++], core_message); - - /* Optionally store the entire coredump in the journal */ - if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && - coredump_size <= (off_t) 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[j].iov_base = coredump_data; - iovec[j].iov_len = sz; - j++; - } - } - - r = sd_journal_sendv(iovec, j); - if (r < 0) - log_error_errno(r, "Failed to log coredump: %m"); - -finish: - return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; -} |