| /*-*- 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; |
| } |