+++ /dev/null
-/*-*- 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"
-
-/* 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, &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, &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;
-}
~ianmdlvl / elogind.git / blobdiff