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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:25:50 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 02:25:50 +0000
commit19f4f86bfed21c5326ed2acebe1163f3a83e832b (patch)
treed59b9989ce55ed23693e80974d94c856f1c2c8b1 /src/coredump
parentInitial commit. (diff)
downloadsystemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.tar.xz
systemd-19f4f86bfed21c5326ed2acebe1163f3a83e832b.zip
Adding upstream version 241.upstream/241upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/coredump')
-rw-r--r--src/coredump/coredump-vacuum.c245
-rw-r--r--src/coredump/coredump-vacuum.h7
-rw-r--r--src/coredump/coredump.c1405
-rw-r--r--src/coredump/coredump.conf21
-rw-r--r--src/coredump/coredumpctl.c1096
-rw-r--r--src/coredump/meson.build28
-rw-r--r--src/coredump/stacktrace.c185
-rw-r--r--src/coredump/stacktrace.h4
-rw-r--r--src/coredump/test-coredump-vacuum.c13
9 files changed, 3004 insertions, 0 deletions
diff --git a/src/coredump/coredump-vacuum.c b/src/coredump/coredump-vacuum.c
new file mode 100644
index 0000000..6ce5dfc
--- /dev/null
+++ b/src/coredump/coredump-vacuum.c
@@ -0,0 +1,245 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <sys/statvfs.h>
+
+#include "alloc-util.h"
+#include "coredump-vacuum.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "macro.h"
+#include "string-util.h"
+#include "time-util.h"
+#include "user-util.h"
+#include "util.h"
+
+#define DEFAULT_MAX_USE_LOWER (uint64_t) (1ULL*1024ULL*1024ULL) /* 1 MiB */
+#define DEFAULT_MAX_USE_UPPER (uint64_t) (4ULL*1024ULL*1024ULL*1024ULL) /* 4 GiB */
+#define DEFAULT_KEEP_FREE_UPPER (uint64_t) (4ULL*1024ULL*1024ULL*1024ULL) /* 4 GiB */
+#define DEFAULT_KEEP_FREE (uint64_t) (1024ULL*1024ULL) /* 1 MB */
+
+struct vacuum_candidate {
+ unsigned n_files;
+ char *oldest_file;
+ usec_t oldest_mtime;
+};
+
+static void vacuum_candidate_free(struct vacuum_candidate *c) {
+ if (!c)
+ return;
+
+ free(c->oldest_file);
+ free(c);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct vacuum_candidate*, vacuum_candidate_free);
+
+static void vacuum_candidate_hashmap_free(Hashmap *h) {
+ hashmap_free_with_destructor(h, vacuum_candidate_free);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Hashmap*, vacuum_candidate_hashmap_free);
+
+static int uid_from_file_name(const char *filename, uid_t *uid) {
+ const char *p, *e, *u;
+
+ p = startswith(filename, "core.");
+ if (!p)
+ return -EINVAL;
+
+ /* Skip the comm field */
+ p = strchr(p, '.');
+ if (!p)
+ return -EINVAL;
+ p++;
+
+ /* Find end up UID */
+ e = strchr(p, '.');
+ if (!e)
+ return -EINVAL;
+
+ u = strndupa(p, e-p);
+ return parse_uid(u, uid);
+}
+
+static bool vacuum_necessary(int fd, uint64_t sum, uint64_t keep_free, uint64_t max_use) {
+ uint64_t fs_size = 0, fs_free = (uint64_t) -1;
+ struct statvfs sv;
+
+ assert(fd >= 0);
+
+ if (fstatvfs(fd, &sv) >= 0) {
+ fs_size = sv.f_frsize * sv.f_blocks;
+ fs_free = sv.f_frsize * sv.f_bfree;
+ }
+
+ if (max_use == (uint64_t) -1) {
+
+ if (fs_size > 0) {
+ max_use = PAGE_ALIGN(fs_size / 10); /* 10% */
+
+ if (max_use > DEFAULT_MAX_USE_UPPER)
+ max_use = DEFAULT_MAX_USE_UPPER;
+
+ if (max_use < DEFAULT_MAX_USE_LOWER)
+ max_use = DEFAULT_MAX_USE_LOWER;
+ } else
+ max_use = DEFAULT_MAX_USE_LOWER;
+ } else
+ max_use = PAGE_ALIGN(max_use);
+
+ if (max_use > 0 && sum > max_use)
+ return true;
+
+ if (keep_free == (uint64_t) -1) {
+
+ if (fs_size > 0) {
+ keep_free = PAGE_ALIGN((fs_size * 3) / 20); /* 15% */
+
+ if (keep_free > DEFAULT_KEEP_FREE_UPPER)
+ keep_free = DEFAULT_KEEP_FREE_UPPER;
+ } else
+ keep_free = DEFAULT_KEEP_FREE;
+ } else
+ keep_free = PAGE_ALIGN(keep_free);
+
+ if (keep_free > 0 && fs_free < keep_free)
+ return true;
+
+ return false;
+}
+
+int coredump_vacuum(int exclude_fd, uint64_t keep_free, uint64_t max_use) {
+ _cleanup_closedir_ DIR *d = NULL;
+ struct stat exclude_st;
+ int r;
+
+ if (keep_free == 0 && max_use == 0)
+ return 0;
+
+ if (exclude_fd >= 0) {
+ if (fstat(exclude_fd, &exclude_st) < 0)
+ return log_error_errno(errno, "Failed to fstat(): %m");
+ }
+
+ /* This algorithm will keep deleting the oldest file of the
+ * user with the most coredumps until we are back in the size
+ * limits. Note that vacuuming for journal files is different,
+ * because we rely on rate-limiting of the messages there,
+ * to avoid being flooded. */
+
+ d = opendir("/var/lib/systemd/coredump");
+ if (!d) {
+ if (errno == ENOENT)
+ return 0;
+
+ return log_error_errno(errno, "Can't open coredump directory: %m");
+ }
+
+ for (;;) {
+ _cleanup_(vacuum_candidate_hashmap_freep) Hashmap *h = NULL;
+ struct vacuum_candidate *worst = NULL;
+ struct dirent *de;
+ uint64_t sum = 0;
+
+ rewinddir(d);
+
+ FOREACH_DIRENT(de, d, goto fail) {
+ struct vacuum_candidate *c;
+ struct stat st;
+ uid_t uid;
+ usec_t t;
+
+ r = uid_from_file_name(de->d_name, &uid);
+ if (r < 0)
+ continue;
+
+ if (fstatat(dirfd(d), de->d_name, &st, AT_NO_AUTOMOUNT|AT_SYMLINK_NOFOLLOW) < 0) {
+ if (errno == ENOENT)
+ continue;
+
+ log_warning_errno(errno, "Failed to stat /var/lib/systemd/coredump/%s: %m", de->d_name);
+ continue;
+ }
+
+ if (!S_ISREG(st.st_mode))
+ continue;
+
+ if (exclude_fd >= 0 &&
+ exclude_st.st_dev == st.st_dev &&
+ exclude_st.st_ino == st.st_ino)
+ continue;
+
+ r = hashmap_ensure_allocated(&h, NULL);
+ if (r < 0)
+ return log_oom();
+
+ t = timespec_load(&st.st_mtim);
+
+ c = hashmap_get(h, UID_TO_PTR(uid));
+ if (c) {
+
+ if (t < c->oldest_mtime) {
+ char *n;
+
+ n = strdup(de->d_name);
+ if (!n)
+ return log_oom();
+
+ free(c->oldest_file);
+ c->oldest_file = n;
+ c->oldest_mtime = t;
+ }
+
+ } else {
+ _cleanup_(vacuum_candidate_freep) struct vacuum_candidate *n = NULL;
+
+ n = new0(struct vacuum_candidate, 1);
+ if (!n)
+ return log_oom();
+
+ n->oldest_file = strdup(de->d_name);
+ if (!n->oldest_file)
+ return log_oom();
+
+ n->oldest_mtime = t;
+
+ r = hashmap_put(h, UID_TO_PTR(uid), n);
+ if (r < 0)
+ return log_oom();
+
+ c = TAKE_PTR(n);
+ }
+
+ c->n_files++;
+
+ if (!worst ||
+ worst->n_files < c->n_files ||
+ (worst->n_files == c->n_files && c->oldest_mtime < worst->oldest_mtime))
+ worst = c;
+
+ sum += st.st_blocks * 512;
+ }
+
+ if (!worst)
+ break;
+
+ r = vacuum_necessary(dirfd(d), sum, keep_free, max_use);
+ if (r <= 0)
+ return r;
+
+ r = unlinkat_deallocate(dirfd(d), worst->oldest_file, 0);
+ if (r == -ENOENT)
+ continue;
+ if (r < 0)
+ return log_error_errno(r, "Failed to remove file %s: %m", worst->oldest_file);
+
+ log_info("Removed old coredump %s.", worst->oldest_file);
+ }
+
+ return 0;
+
+fail:
+ return log_error_errno(errno, "Failed to read directory: %m");
+}
diff --git a/src/coredump/coredump-vacuum.h b/src/coredump/coredump-vacuum.h
new file mode 100644
index 0000000..0db1167
--- /dev/null
+++ b/src/coredump/coredump-vacuum.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include <inttypes.h>
+#include <sys/types.h>
+
+int coredump_vacuum(int exclude_fd, uint64_t keep_free, uint64_t max_use);
diff --git a/src/coredump/coredump.c b/src/coredump/coredump.c
new file mode 100644
index 0000000..ecbb4bf
--- /dev/null
+++ b/src/coredump/coredump.c
@@ -0,0 +1,1405 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <sys/prctl.h>
+#include <sys/xattr.h>
+#include <unistd.h>
+
+#if HAVE_ELFUTILS
+#include <dwarf.h>
+#include <elfutils/libdwfl.h>
+#endif
+
+#include "sd-daemon.h"
+#include "sd-journal.h"
+#include "sd-login.h"
+#include "sd-messages.h"
+
+#include "acl-util.h"
+#include "alloc-util.h"
+#include "capability-util.h"
+#include "cgroup-util.h"
+#include "compress.h"
+#include "conf-parser.h"
+#include "copy.h"
+#include "coredump-vacuum.h"
+#include "dirent-util.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "io-util.h"
+#include "journal-importer.h"
+#include "log.h"
+#include "macro.h"
+#include "main-func.h"
+#include "missing.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "signal-util.h"
+#include "socket-util.h"
+#include "special.h"
+#include "stacktrace.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tmpfile-util.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 */
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+#define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU))
+#else
+/* oss-fuzz limits memory usage. */
+#define JOURNAL_SIZE_MAX ((size_t) (10LU*1024LU*1024LU))
+#endif
+
+/* Make sure to not make this larger than the maximum journal entry
+ * size. See DATA_SIZE_MAX in journal-importer.h. */
+assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX);
+
+enum {
+ /* We use this as array indexes for a couple of special fields we use for
+ * naming coredump files, and attaching xattrs, and for indexing argv[].
+
+ * Our pattern for man:systectl(1) kernel.core_pattern is such that the
+ * kernel passes fields until CONTEXT_RLIMIT as arguments in argv[]. After
+ * that it gets complicated: the kernel passes "comm" as one or more fields
+ * starting at index CONTEXT_COMM (in other words, full "comm" is under index
+ * CONTEXT_COMM when it does not contain spaces, which is the common
+ * case). This mapping is not reversible, so we prefer to retrieve "comm"
+ * from /proc. We only fall back to argv[CONTEXT_COMM...] when that fails.
+ *
+ * In the internal context[] array, fields before CONTEXT_COMM are the
+ * strings from argv[], so they should not be freed. The strings at indices
+ * CONTEXT_COMM and higher are allocated by us and should be freed at the
+ * end.
+ */
+ CONTEXT_PID,
+ CONTEXT_UID,
+ CONTEXT_GID,
+ CONTEXT_SIGNAL,
+ CONTEXT_TIMESTAMP,
+ CONTEXT_RLIMIT,
+ CONTEXT_HOSTNAME,
+ CONTEXT_COMM,
+ CONTEXT_EXE,
+ CONTEXT_UNIT,
+ _CONTEXT_MAX
+};
+
+typedef enum CoredumpStorage {
+ COREDUMP_STORAGE_NONE,
+ COREDUMP_STORAGE_EXTERNAL,
+ COREDUMP_STORAGE_JOURNAL,
+ _COREDUMP_STORAGE_MAX,
+ _COREDUMP_STORAGE_INVALID = -1
+} CoredumpStorage;
+
+static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = {
+ [COREDUMP_STORAGE_NONE] = "none",
+ [COREDUMP_STORAGE_EXTERNAL] = "external",
+ [COREDUMP_STORAGE_JOURNAL] = "journal",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage);
+static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting");
+
+static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL;
+static bool arg_compress = true;
+static uint64_t arg_process_size_max = PROCESS_SIZE_MAX;
+static uint64_t arg_external_size_max = EXTERNAL_SIZE_MAX;
+static uint64_t arg_journal_size_max = JOURNAL_SIZE_MAX;
+static uint64_t arg_keep_free = (uint64_t) -1;
+static uint64_t arg_max_use = (uint64_t) -1;
+
+static int parse_config(void) {
+ static const ConfigTableItem items[] = {
+ { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage },
+ { "Coredump", "Compress", config_parse_bool, 0, &arg_compress },
+ { "Coredump", "ProcessSizeMax", config_parse_iec_uint64, 0, &arg_process_size_max },
+ { "Coredump", "ExternalSizeMax", config_parse_iec_uint64, 0, &arg_external_size_max },
+ { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max },
+ { "Coredump", "KeepFree", config_parse_iec_uint64, 0, &arg_keep_free },
+ { "Coredump", "MaxUse", config_parse_iec_uint64, 0, &arg_max_use },
+ {}
+ };
+
+ return config_parse_many_nulstr(PKGSYSCONFDIR "/coredump.conf",
+ CONF_PATHS_NULSTR("systemd/coredump.conf.d"),
+ "Coredump\0",
+ config_item_table_lookup, items,
+ CONFIG_PARSE_WARN, NULL);
+}
+
+static uint64_t storage_size_max(void) {
+ if (arg_storage == COREDUMP_STORAGE_EXTERNAL)
+ return arg_external_size_max;
+ if (arg_storage == COREDUMP_STORAGE_JOURNAL)
+ return arg_journal_size_max;
+ assert(arg_storage == COREDUMP_STORAGE_NONE);
+ return 0;
+}
+
+static int fix_acl(int fd, uid_t uid) {
+
+#if HAVE_ACL
+ _cleanup_(acl_freep) acl_t acl = NULL;
+ acl_entry_t entry;
+ acl_permset_t permset;
+ int r;
+
+ assert(fd >= 0);
+
+ if (uid_is_system(uid) || uid_is_dynamic(uid) || uid == UID_NOBODY)
+ return 0;
+
+ /* Make sure normal users can read (but not write or delete)
+ * their own coredumps */
+
+ acl = acl_get_fd(fd);
+ if (!acl)
+ return log_error_errno(errno, "Failed to get ACL: %m");
+
+ if (acl_create_entry(&acl, &entry) < 0 ||
+ acl_set_tag_type(entry, ACL_USER) < 0 ||
+ acl_set_qualifier(entry, &uid) < 0)
+ return log_error_errno(errno, "Failed to patch ACL: %m");
+
+ if (acl_get_permset(entry, &permset) < 0 ||
+ acl_add_perm(permset, ACL_READ) < 0)
+ return log_warning_errno(errno, "Failed to patch ACL: %m");
+
+ r = calc_acl_mask_if_needed(&acl);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to patch ACL: %m");
+
+ if (acl_set_fd(fd, acl) < 0)
+ return log_error_errno(errno, "Failed to apply ACL: %m");
+#endif
+
+ return 0;
+}
+
+static int fix_xattr(int fd, const char *context[_CONTEXT_MAX]) {
+
+ static const char * const xattrs[_CONTEXT_MAX] = {
+ [CONTEXT_PID] = "user.coredump.pid",
+ [CONTEXT_UID] = "user.coredump.uid",
+ [CONTEXT_GID] = "user.coredump.gid",
+ [CONTEXT_SIGNAL] = "user.coredump.signal",
+ [CONTEXT_TIMESTAMP] = "user.coredump.timestamp",
+ [CONTEXT_RLIMIT] = "user.coredump.rlimit",
+ [CONTEXT_HOSTNAME] = "user.coredump.hostname",
+ [CONTEXT_COMM] = "user.coredump.comm",
+ [CONTEXT_EXE] = "user.coredump.exe",
+ };
+
+ int r = 0;
+ unsigned i;
+
+ assert(fd >= 0);
+
+ /* Attach some metadata to coredumps via extended
+ * attributes. Just because we can. */
+
+ for (i = 0; i < _CONTEXT_MAX; i++) {
+ int k;
+
+ if (isempty(context[i]) || !xattrs[i])
+ continue;
+
+ k = fsetxattr(fd, xattrs[i], context[i], strlen(context[i]), XATTR_CREATE);
+ if (k < 0 && r == 0)
+ r = -errno;
+ }
+
+ return r;
+}
+
+#define filename_escape(s) xescape((s), "./ ")
+
+static const char *coredump_tmpfile_name(const char *s) {
+ return s ? s : "(unnamed temporary file)";
+}
+
+static int fix_permissions(
+ int fd,
+ const char *filename,
+ const char *target,
+ const char *context[_CONTEXT_MAX],
+ uid_t uid) {
+
+ int r;
+
+ assert(fd >= 0);
+ assert(target);
+ assert(context);
+
+ /* Ignore errors on these */
+ (void) fchmod(fd, 0640);
+ (void) fix_acl(fd, uid);
+ (void) fix_xattr(fd, context);
+
+ if (fsync(fd) < 0)
+ return log_error_errno(errno, "Failed to sync coredump %s: %m", coredump_tmpfile_name(filename));
+
+ (void) fsync_directory_of_file(fd);
+
+ r = link_tmpfile(fd, filename, target);
+ if (r < 0)
+ return log_error_errno(r, "Failed to move coredump %s into place: %m", target);
+
+ return 0;
+}
+
+static int maybe_remove_external_coredump(const char *filename, uint64_t size) {
+
+ /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */
+
+ if (arg_storage == COREDUMP_STORAGE_EXTERNAL &&
+ size <= arg_external_size_max)
+ return 0;
+
+ if (!filename)
+ return 1;
+
+ if (unlink(filename) < 0 && errno != ENOENT)
+ return log_error_errno(errno, "Failed to unlink %s: %m", filename);
+
+ return 1;
+}
+
+static int make_filename(const char *context[_CONTEXT_MAX], char **ret) {
+ _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL;
+ sd_id128_t boot = {};
+ int r;
+
+ assert(context);
+
+ c = filename_escape(context[CONTEXT_COMM]);
+ if (!c)
+ return -ENOMEM;
+
+ u = filename_escape(context[CONTEXT_UID]);
+ if (!u)
+ return -ENOMEM;
+
+ r = sd_id128_get_boot(&boot);
+ if (r < 0)
+ return r;
+
+ p = filename_escape(context[CONTEXT_PID]);
+ if (!p)
+ return -ENOMEM;
+
+ t = filename_escape(context[CONTEXT_TIMESTAMP]);
+ if (!t)
+ return -ENOMEM;
+
+ if (asprintf(ret,
+ "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000",
+ c,
+ u,
+ SD_ID128_FORMAT_VAL(boot),
+ p,
+ t) < 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int save_external_coredump(
+ const char *context[_CONTEXT_MAX],
+ int input_fd,
+ char **ret_filename,
+ int *ret_node_fd,
+ int *ret_data_fd,
+ uint64_t *ret_size,
+ bool *ret_truncated) {
+
+ _cleanup_free_ char *fn = NULL, *tmp = NULL;
+ _cleanup_close_ int fd = -1;
+ uint64_t rlimit, process_limit, max_size;
+ struct stat st;
+ uid_t uid;
+ int r;
+
+ assert(context);
+ assert(ret_filename);
+ assert(ret_node_fd);
+ assert(ret_data_fd);
+ assert(ret_size);
+
+ r = parse_uid(context[CONTEXT_UID], &uid);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse UID: %m");
+
+ r = safe_atou64(context[CONTEXT_RLIMIT], &rlimit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse resource limit '%s': %m", context[CONTEXT_RLIMIT]);
+ if (rlimit < page_size()) {
+ /* Is coredumping disabled? Then don't bother saving/processing the coredump.
+ * Anything below PAGE_SIZE cannot give a readable coredump (the kernel uses
+ * ELF_EXEC_PAGESIZE which is not easily accessible, but is usually the same as PAGE_SIZE. */
+ return log_info_errno(SYNTHETIC_ERRNO(EBADSLT),
+ "Resource limits disable core dumping for process %s (%s).",
+ context[CONTEXT_PID], context[CONTEXT_COMM]);
+ }
+
+ process_limit = MAX(arg_process_size_max, storage_size_max());
+ if (process_limit == 0)
+ return log_debug_errno(SYNTHETIC_ERRNO(EBADSLT),
+ "Limits for coredump processing and storage are both 0, not dumping core.");
+
+ /* Never store more than the process configured, or than we actually shall keep or process */
+ max_size = MIN(rlimit, process_limit);
+
+ r = make_filename(context, &fn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine coredump file name: %m");
+
+ mkdir_p_label("/var/lib/systemd/coredump", 0755);
+
+ fd = open_tmpfile_linkable(fn, O_RDWR|O_CLOEXEC, &tmp);
+ if (fd < 0)
+ return log_error_errno(fd, "Failed to create temporary file for coredump %s: %m", fn);
+
+ r = copy_bytes(input_fd, fd, max_size, 0);
+ if (r < 0) {
+ log_error_errno(r, "Cannot store coredump of %s (%s): %m", context[CONTEXT_PID], context[CONTEXT_COMM]);
+ goto fail;
+ }
+ *ret_truncated = r == 1;
+ if (*ret_truncated)
+ log_struct(LOG_INFO,
+ LOG_MESSAGE("Core file was truncated to %zu bytes.", max_size),
+ "SIZE_LIMIT=%zu", max_size,
+ "MESSAGE_ID=" SD_MESSAGE_TRUNCATED_CORE_STR);
+
+ if (fstat(fd, &st) < 0) {
+ log_error_errno(errno, "Failed to fstat core file %s: %m", coredump_tmpfile_name(tmp));
+ goto fail;
+ }
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1) {
+ log_error_errno(errno, "Failed to seek on %s: %m", coredump_tmpfile_name(tmp));
+ goto fail;
+ }
+
+#if HAVE_XZ || HAVE_LZ4
+ /* If we will remove the coredump anyway, do not compress. */
+ if (arg_compress && !maybe_remove_external_coredump(NULL, st.st_size)) {
+
+ _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL;
+ _cleanup_close_ int fd_compressed = -1;
+
+ fn_compressed = strappend(fn, COMPRESSED_EXT);
+ if (!fn_compressed) {
+ log_oom();
+ goto uncompressed;
+ }
+
+ fd_compressed = open_tmpfile_linkable(fn_compressed, O_RDWR|O_CLOEXEC, &tmp_compressed);
+ if (fd_compressed < 0) {
+ log_error_errno(fd_compressed, "Failed to create temporary file for coredump %s: %m", fn_compressed);
+ goto uncompressed;
+ }
+
+ r = compress_stream(fd, fd_compressed, -1);
+ if (r < 0) {
+ log_error_errno(r, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed));
+ goto fail_compressed;
+ }
+
+ r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, context, uid);
+ if (r < 0)
+ goto fail_compressed;
+
+ /* OK, this worked, we can get rid of the uncompressed version now */
+ if (tmp)
+ unlink_noerrno(tmp);
+
+ *ret_filename = TAKE_PTR(fn_compressed); /* compressed */
+ *ret_node_fd = TAKE_FD(fd_compressed); /* compressed */
+ *ret_data_fd = TAKE_FD(fd); /* uncompressed */
+ *ret_size = (uint64_t) st.st_size; /* uncompressed */
+
+ return 0;
+
+ fail_compressed:
+ if (tmp_compressed)
+ (void) unlink(tmp_compressed);
+ }
+
+uncompressed:
+#endif
+
+ r = fix_permissions(fd, tmp, fn, context, uid);
+ if (r < 0)
+ goto fail;
+
+ *ret_filename = TAKE_PTR(fn);
+ *ret_data_fd = TAKE_FD(fd);
+ *ret_node_fd = -1;
+ *ret_size = (uint64_t) st.st_size;
+
+ return 0;
+
+fail:
+ if (tmp)
+ (void) unlink(tmp);
+ return r;
+}
+
+static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) {
+ _cleanup_free_ char *field = NULL;
+ ssize_t n;
+
+ assert(fd >= 0);
+ assert(ret);
+ assert(ret_size);
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
+ return log_warning_errno(errno, "Failed to seek: %m");
+
+ field = malloc(9 + size);
+ if (!field) {
+ log_warning("Failed to allocate memory for coredump, coredump will not be stored.");
+ return -ENOMEM;
+ }
+
+ memcpy(field, "COREDUMP=", 9);
+
+ n = read(fd, field + 9, size);
+ if (n < 0)
+ return log_error_errno((int) n, "Failed to read core data: %m");
+ if ((size_t) n < size)
+ return log_error_errno(SYNTHETIC_ERRNO(EIO),
+ "Core data too short.");
+
+ *ret = TAKE_PTR(field);
+ *ret_size = size + 9;
+
+ return 0;
+}
+
+/* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines:
+ * 0:/dev/pts/23
+ * pos: 0
+ * flags: 0100002
+ *
+ * 1:/dev/pts/23
+ * pos: 0
+ * flags: 0100002
+ *
+ * 2:/dev/pts/23
+ * pos: 0
+ * flags: 0100002
+ * EOF
+ */
+static int compose_open_fds(pid_t pid, char **open_fds) {
+ _cleanup_closedir_ DIR *proc_fd_dir = NULL;
+ _cleanup_close_ int proc_fdinfo_fd = -1;
+ _cleanup_free_ char *buffer = NULL;
+ _cleanup_fclose_ FILE *stream = NULL;
+ const char *fddelim = "", *path;
+ struct dirent *dent = NULL;
+ size_t size = 0;
+ int r;
+
+ assert(pid >= 0);
+ assert(open_fds != NULL);
+
+ path = procfs_file_alloca(pid, "fd");
+ proc_fd_dir = opendir(path);
+ if (!proc_fd_dir)
+ return -errno;
+
+ proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (proc_fdinfo_fd < 0)
+ return -errno;
+
+ stream = open_memstream(&buffer, &size);
+ if (!stream)
+ return -ENOMEM;
+
+ (void) __fsetlocking(stream, FSETLOCKING_BYCALLER);
+
+ FOREACH_DIRENT(dent, proc_fd_dir, return -errno) {
+ _cleanup_fclose_ FILE *fdinfo = NULL;
+ _cleanup_free_ char *fdname = NULL;
+ 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, "r");
+ if (!fdinfo) {
+ safe_close(fd);
+ continue;
+ }
+
+ for (;;) {
+ _cleanup_free_ char *line = NULL;
+
+ r = read_line(fdinfo, LONG_LINE_MAX, &line);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ fputs(line, stream);
+ fputc('\n', stream);
+ }
+ }
+
+ errno = 0;
+ stream = safe_fclose(stream);
+
+ if (errno > 0)
+ return -errno;
+
+ *open_fds = TAKE_PTR(buffer);
+
+ return 0;
+}
+
+static int get_process_ns(pid_t pid, const char *namespace, ino_t *ns) {
+ const char *p;
+ struct stat stbuf;
+ _cleanup_close_ int proc_ns_dir_fd;
+
+ p = procfs_file_alloca(pid, "ns");
+
+ proc_ns_dir_fd = open(p, O_DIRECTORY | O_CLOEXEC | O_RDONLY);
+ if (proc_ns_dir_fd < 0)
+ return -errno;
+
+ if (fstatat(proc_ns_dir_fd, namespace, &stbuf, /* flags */0) < 0)
+ return -errno;
+
+ *ns = stbuf.st_ino;
+ return 0;
+}
+
+static int get_mount_namespace_leader(pid_t pid, pid_t *container_pid) {
+ pid_t cpid = pid, ppid = 0;
+ ino_t proc_mntns;
+ int r = 0;
+
+ r = get_process_ns(pid, "mnt", &proc_mntns);
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ ino_t parent_mntns;
+
+ r = get_process_ppid(cpid, &ppid);
+ if (r < 0)
+ return r;
+
+ r = get_process_ns(ppid, "mnt", &parent_mntns);
+ if (r < 0)
+ return r;
+
+ if (proc_mntns != parent_mntns)
+ break;
+
+ if (ppid == 1)
+ return -ENOENT;
+
+ cpid = ppid;
+ }
+
+ *container_pid = ppid;
+ return 0;
+}
+
+/* Returns 1 if the parent was found.
+ * Returns 0 if there is not a process we can call the pid's
+ * container parent (the pid's process isn't 'containerized').
+ * Returns a negative number on errors.
+ */
+static int get_process_container_parent_cmdline(pid_t pid, char** cmdline) {
+ int r = 0;
+ pid_t container_pid;
+ const char *proc_root_path;
+ struct stat root_stat, proc_root_stat;
+
+ /* To compare inodes of / and /proc/[pid]/root */
+ if (stat("/", &root_stat) < 0)
+ return -errno;
+
+ proc_root_path = procfs_file_alloca(pid, "root");
+ if (stat(proc_root_path, &proc_root_stat) < 0)
+ return -errno;
+
+ /* The process uses system root. */
+ if (proc_root_stat.st_ino == root_stat.st_ino) {
+ *cmdline = NULL;
+ return 0;
+ }
+
+ r = get_mount_namespace_leader(pid, &container_pid);
+ if (r < 0)
+ return r;
+
+ r = get_process_cmdline(container_pid, 0, false, cmdline);
+ if (r < 0)
+ return r;
+
+ return 1;
+}
+
+static int change_uid_gid(const char *context[]) {
+ uid_t uid;
+ gid_t gid;
+ int r;
+
+ r = parse_uid(context[CONTEXT_UID], &uid);
+ if (r < 0)
+ return r;
+
+ if (uid <= SYSTEM_UID_MAX) {
+ const char *user = "systemd-coredump";
+
+ r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
+ if (r < 0) {
+ log_warning_errno(r, "Cannot resolve %s user. Proceeding to dump core as root: %m", user);
+ uid = gid = 0;
+ }
+ } else {
+ r = parse_gid(context[CONTEXT_GID], &gid);
+ if (r < 0)
+ return r;
+ }
+
+ return drop_privileges(uid, gid, 0);
+}
+
+static bool is_journald_crash(const char *context[_CONTEXT_MAX]) {
+ assert(context);
+
+ return streq_ptr(context[CONTEXT_UNIT], SPECIAL_JOURNALD_SERVICE);
+}
+
+static bool is_pid1_crash(const char *context[_CONTEXT_MAX]) {
+ assert(context);
+
+ return streq_ptr(context[CONTEXT_UNIT], SPECIAL_INIT_SCOPE) ||
+ streq_ptr(context[CONTEXT_PID], "1");
+}
+
+#define SUBMIT_COREDUMP_FIELDS 4
+
+static int submit_coredump(
+ const char *context[_CONTEXT_MAX],
+ struct iovec *iovec,
+ size_t n_iovec_allocated,
+ size_t n_iovec,
+ int input_fd) {
+
+ _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1;
+ _cleanup_free_ char *core_message = NULL, *filename = NULL, *coredump_data = NULL;
+ uint64_t coredump_size = UINT64_MAX;
+ bool truncated = false, journald_crash;
+ int r;
+
+ assert(context);
+ assert(iovec);
+ assert(n_iovec_allocated >= n_iovec + SUBMIT_COREDUMP_FIELDS);
+ assert(input_fd >= 0);
+
+ journald_crash = is_journald_crash(context);
+
+ /* Vacuum before we write anything again */
+ (void) coredump_vacuum(-1, arg_keep_free, arg_max_use);
+
+ /* Always stream the coredump to disk, if that's possible */
+ r = save_external_coredump(context, input_fd,
+ &filename, &coredump_node_fd, &coredump_fd, &coredump_size, &truncated);
+ if (r < 0)
+ /* Skip whole core dumping part */
+ goto log;
+
+ /* If we don't want to keep the coredump on disk, remove it now, as later on we will lack the privileges for
+ * it. However, we keep the fd to it, so that we can still process it and log it. */
+ r = maybe_remove_external_coredump(filename, coredump_size);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ const char *coredump_filename;
+
+ coredump_filename = strjoina("COREDUMP_FILENAME=", filename);
+ iovec[n_iovec++] = IOVEC_MAKE_STRING(coredump_filename);
+ } else if (arg_storage == COREDUMP_STORAGE_EXTERNAL)
+ log_info("The core will not be stored: size %"PRIu64" is greater than %"PRIu64" (the configured maximum)",
+ coredump_size, arg_external_size_max);
+
+ /* Vacuum again, but exclude the coredump we just created */
+ (void) coredump_vacuum(coredump_node_fd >= 0 ? coredump_node_fd : coredump_fd, arg_keep_free, arg_max_use);
+
+ /* Now, let's drop privileges to become the user who owns the segfaulted process and allocate the coredump
+ * memory under the user's uid. This also ensures that the credentials journald will see are the ones of the
+ * coredumping user, thus making sure the user gets access to the core dump. Let's also get rid of all
+ * capabilities, if we run as root, we won't need them anymore. */
+ r = change_uid_gid(context);
+ if (r < 0)
+ return log_error_errno(r, "Failed to drop privileges: %m");
+
+#if HAVE_ELFUTILS
+ /* Try to get a strack trace if we can */
+ if (coredump_size <= arg_process_size_max) {
+ _cleanup_free_ char *stacktrace = NULL;
+
+ r = coredump_make_stack_trace(coredump_fd, context[CONTEXT_EXE], &stacktrace);
+ if (r >= 0)
+ core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID],
+ " (", context[CONTEXT_COMM], ") of user ",
+ context[CONTEXT_UID], " dumped core.",
+ journald_crash ? "\nCoredump diverted to " : "",
+ journald_crash ? filename : "",
+ "\n\n", stacktrace);
+ else if (r == -EINVAL)
+ log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno()));
+ else
+ log_warning_errno(r, "Failed to generate stack trace: %m");
+ } else
+ log_debug("Not generating stack trace: core size %"PRIu64" is greater than %"PRIu64" (the configured maximum)",
+ coredump_size, arg_process_size_max);
+
+ if (!core_message)
+#endif
+log:
+ core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID],
+ " (", context[CONTEXT_COMM], ") of user ",
+ context[CONTEXT_UID], " dumped core.",
+ journald_crash && filename ? "\nCoredump diverted to " : NULL,
+ journald_crash && filename ? filename : NULL);
+ if (!core_message)
+ return log_oom();
+
+ if (journald_crash) {
+ /* We cannot log to the journal, so just print the message.
+ * The target was set previously to something safe. */
+ assert(startswith(core_message, "MESSAGE="));
+ log_dispatch(LOG_ERR, 0, core_message + strlen("MESSAGE="));
+ return 0;
+ }
+
+ iovec[n_iovec++] = IOVEC_MAKE_STRING(core_message);
+
+ if (truncated)
+ iovec[n_iovec++] = IOVEC_MAKE_STRING("COREDUMP_TRUNCATED=1");
+
+ /* Optionally store the entire coredump in the journal */
+ if (arg_storage == COREDUMP_STORAGE_JOURNAL) {
+ if (coredump_size <= arg_journal_size_max) {
+ size_t sz = 0;
+
+ /* Store the coredump itself in the journal */
+
+ r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz);
+ if (r >= 0)
+ iovec[n_iovec++] = IOVEC_MAKE(coredump_data, sz);
+ else
+ log_warning_errno(r, "Failed to attach the core to the journal entry: %m");
+ } else
+ log_info("The core will not be stored: size %"PRIu64" is greater than %"PRIu64" (the configured maximum)",
+ coredump_size, arg_journal_size_max);
+ }
+
+ assert(n_iovec <= n_iovec_allocated);
+
+ r = sd_journal_sendv(iovec, n_iovec);
+ if (r < 0)
+ return log_error_errno(r, "Failed to log coredump: %m");
+
+ return 0;
+}
+
+static void map_context_fields(const struct iovec *iovec, const char* context[]) {
+
+ static const char * const context_field_names[] = {
+ [CONTEXT_PID] = "COREDUMP_PID=",
+ [CONTEXT_UID] = "COREDUMP_UID=",
+ [CONTEXT_GID] = "COREDUMP_GID=",
+ [CONTEXT_SIGNAL] = "COREDUMP_SIGNAL=",
+ [CONTEXT_TIMESTAMP] = "COREDUMP_TIMESTAMP=",
+ [CONTEXT_RLIMIT] = "COREDUMP_RLIMIT=",
+ [CONTEXT_HOSTNAME] = "COREDUMP_HOSTNAME=",
+ [CONTEXT_COMM] = "COREDUMP_COMM=",
+ [CONTEXT_EXE] = "COREDUMP_EXE=",
+ };
+
+ unsigned i;
+
+ assert(iovec);
+ assert(context);
+
+ for (i = 0; i < ELEMENTSOF(context_field_names); i++) {
+ char *p;
+
+ if (!context_field_names[i])
+ continue;
+
+ p = memory_startswith(iovec->iov_base, iovec->iov_len, context_field_names[i]);
+ if (!p)
+ continue;
+
+ /* Note that these strings are NUL terminated, because we made sure that a trailing NUL byte is in the
+ * buffer, though not included in the iov_len count. (see below) */
+ context[i] = p;
+ break;
+ }
+}
+
+static int process_socket(int fd) {
+ _cleanup_close_ int coredump_fd = -1;
+ struct iovec *iovec = NULL;
+ size_t n_iovec = 0, n_allocated = 0, i, k;
+ const char *context[_CONTEXT_MAX] = {};
+ int r;
+
+ assert(fd >= 0);
+
+ log_setup_service();
+
+ log_debug("Processing coredump received on stdin...");
+
+ for (;;) {
+ union {
+ struct cmsghdr cmsghdr;
+ uint8_t buf[CMSG_SPACE(sizeof(int))];
+ } control = {};
+ struct msghdr mh = {
+ .msg_control = &control,
+ .msg_controllen = sizeof(control),
+ .msg_iovlen = 1,
+ };
+ ssize_t n;
+ ssize_t l;
+
+ if (!GREEDY_REALLOC(iovec, n_allocated, n_iovec + SUBMIT_COREDUMP_FIELDS)) {
+ r = log_oom();
+ goto finish;
+ }
+
+ l = next_datagram_size_fd(fd);
+ if (l < 0) {
+ r = log_error_errno(l, "Failed to determine datagram size to read: %m");
+ goto finish;
+ }
+
+ assert(l >= 0);
+
+ iovec[n_iovec].iov_len = l;
+ iovec[n_iovec].iov_base = malloc(l + 1);
+ if (!iovec[n_iovec].iov_base) {
+ r = log_oom();
+ goto finish;
+ }
+
+ mh.msg_iov = iovec + n_iovec;
+
+ n = recvmsg(fd, &mh, MSG_CMSG_CLOEXEC);
+ if (n < 0) {
+ free(iovec[n_iovec].iov_base);
+ r = log_error_errno(errno, "Failed to receive datagram: %m");
+ goto finish;
+ }
+
+ if (n == 0) {
+ struct cmsghdr *cmsg, *found = NULL;
+ /* The final zero-length datagram carries the file descriptor and tells us that we're done. */
+
+ free(iovec[n_iovec].iov_base);
+
+ CMSG_FOREACH(cmsg, &mh) {
+ if (cmsg->cmsg_level == SOL_SOCKET &&
+ cmsg->cmsg_type == SCM_RIGHTS &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(int))) {
+ assert(!found);
+ found = cmsg;
+ }
+ }
+
+ if (!found) {
+ log_error("Coredump file descriptor missing.");
+ r = -EBADMSG;
+ goto finish;
+ }
+
+ assert(coredump_fd < 0);
+ coredump_fd = *(int*) CMSG_DATA(found);
+ break;
+ }
+
+ /* Add trailing NUL byte, in case these are strings */
+ ((char*) iovec[n_iovec].iov_base)[n] = 0;
+ iovec[n_iovec].iov_len = (size_t) n;
+
+ cmsg_close_all(&mh);
+ map_context_fields(iovec + n_iovec, context);
+ n_iovec++;
+ }
+
+ if (!GREEDY_REALLOC(iovec, n_allocated, n_iovec + SUBMIT_COREDUMP_FIELDS)) {
+ r = log_oom();
+ goto finish;
+ }
+
+ /* Make sure we got all data we really need */
+ assert(context[CONTEXT_PID]);
+ assert(context[CONTEXT_UID]);
+ assert(context[CONTEXT_GID]);
+ assert(context[CONTEXT_SIGNAL]);
+ assert(context[CONTEXT_TIMESTAMP]);
+ assert(context[CONTEXT_RLIMIT]);
+ assert(context[CONTEXT_HOSTNAME]);
+ assert(context[CONTEXT_COMM]);
+ assert(coredump_fd >= 0);
+
+ /* Small quirk: the journal fields contain the timestamp padded with six zeroes, so that the kernel-supplied 1s
+ * granularity timestamps becomes 1µs granularity, i.e. the granularity systemd usually operates in. Since we
+ * are reconstructing the original kernel context, we chop this off again, here. */
+ k = strlen(context[CONTEXT_TIMESTAMP]);
+ if (k > 6)
+ context[CONTEXT_TIMESTAMP] = strndupa(context[CONTEXT_TIMESTAMP], k - 6);
+
+ r = submit_coredump(context, iovec, n_allocated, n_iovec, coredump_fd);
+
+finish:
+ for (i = 0; i < n_iovec; i++)
+ free(iovec[i].iov_base);
+ free(iovec);
+
+ return r;
+}
+
+static int send_iovec(const struct iovec iovec[], size_t n_iovec, int input_fd) {
+
+ static const union sockaddr_union sa = {
+ .un.sun_family = AF_UNIX,
+ .un.sun_path = "/run/systemd/coredump",
+ };
+ _cleanup_close_ int fd = -1;
+ size_t i;
+ int r;
+
+ assert(iovec || n_iovec <= 0);
+ assert(input_fd >= 0);
+
+ fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to create coredump socket: %m");
+
+ if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
+ return log_error_errno(errno, "Failed to connect to coredump service: %m");
+
+ for (i = 0; i < n_iovec; i++) {
+ struct msghdr mh = {
+ .msg_iov = (struct iovec*) iovec + i,
+ .msg_iovlen = 1,
+ };
+ struct iovec copy[2];
+
+ for (;;) {
+ if (sendmsg(fd, &mh, MSG_NOSIGNAL) >= 0)
+ break;
+
+ if (errno == EMSGSIZE && mh.msg_iov[0].iov_len > 0) {
+ /* This field didn't fit? That's a pity. Given that this is just metadata,
+ * let's truncate the field at half, and try again. We append three dots, in
+ * order to show that this is truncated. */
+
+ if (mh.msg_iov != copy) {
+ /* We don't want to modify the caller's iovec, hence let's create our
+ * own array, consisting of two new iovecs, where the first is a
+ * (truncated) copy of what we want to send, and the second one
+ * contains the trailing dots. */
+ copy[0] = iovec[i];
+ copy[1] = (struct iovec) {
+ .iov_base = (char[]) { '.', '.', '.' },
+ .iov_len = 3,
+ };
+
+ mh.msg_iov = copy;
+ mh.msg_iovlen = 2;
+ }
+
+ copy[0].iov_len /= 2; /* halve it, and try again */
+ continue;
+ }
+
+ return log_error_errno(errno, "Failed to send coredump datagram: %m");
+ }
+ }
+
+ r = send_one_fd(fd, input_fd, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to send coredump fd: %m");
+
+ return 0;
+}
+
+static char* set_iovec_field_free(struct iovec *iovec, size_t *n_iovec, const char *field, char *value) {
+ char *x;
+
+ x = set_iovec_string_field(iovec, n_iovec, field, value);
+ free(value);
+ return x;
+}
+
+static int gather_pid_metadata(
+ char* context[_CONTEXT_MAX],
+ char **comm_fallback,
+ struct iovec *iovec, size_t *n_iovec) {
+
+ /* We need 27 empty slots in iovec!
+ *
+ * Note that if we fail on oom later on, we do not roll-back changes to the iovec structure. (It remains valid,
+ * with the first n_iovec fields initialized.) */
+
+ uid_t owner_uid;
+ pid_t pid;
+ char *t;
+ const char *p;
+ int r, signo;
+
+ r = parse_pid(context[CONTEXT_PID], &pid);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse PID \"%s\": %m", context[CONTEXT_PID]);
+
+ r = get_process_comm(pid, &context[CONTEXT_COMM]);
+ if (r < 0) {
+ log_warning_errno(r, "Failed to get COMM, falling back to the command line: %m");
+ context[CONTEXT_COMM] = strv_join(comm_fallback, " ");
+ if (!context[CONTEXT_COMM])
+ return log_oom();
+ }
+
+ r = get_process_exe(pid, &context[CONTEXT_EXE]);
+ if (r < 0)
+ log_warning_errno(r, "Failed to get EXE, ignoring: %m");
+
+ if (cg_pid_get_unit(pid, &context[CONTEXT_UNIT]) >= 0) {
+ if (!is_journald_crash((const char**) context)) {
+ /* OK, now we know it's not the journal, hence we can make use of it now. */
+ log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
+ log_open();
+ }
+
+ /* If this is PID 1 disable coredump collection, we'll unlikely be able to process it later on. */
+ if (is_pid1_crash((const char**) context)) {
+ log_notice("Due to PID 1 having crashed coredump collection will now be turned off.");
+ disable_coredumps();
+ }
+
+ set_iovec_string_field(iovec, n_iovec, "COREDUMP_UNIT=", context[CONTEXT_UNIT]);
+ }
+
+ if (cg_pid_get_user_unit(pid, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_USER_UNIT=", t);
+
+ /* The next few are mandatory */
+ if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_PID=", context[CONTEXT_PID]))
+ return log_oom();
+
+ if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_UID=", context[CONTEXT_UID]))
+ return log_oom();
+
+ if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_GID=", context[CONTEXT_GID]))
+ return log_oom();
+
+ if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_SIGNAL=", context[CONTEXT_SIGNAL]))
+ return log_oom();
+
+ if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_RLIMIT=", context[CONTEXT_RLIMIT]))
+ return log_oom();
+
+ if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_HOSTNAME=", context[CONTEXT_HOSTNAME]))
+ return log_oom();
+
+ if (!set_iovec_string_field(iovec, n_iovec, "COREDUMP_COMM=", context[CONTEXT_COMM]))
+ return log_oom();
+
+ if (context[CONTEXT_EXE] &&
+ !set_iovec_string_field(iovec, n_iovec, "COREDUMP_EXE=", context[CONTEXT_EXE]))
+ return log_oom();
+
+ if (sd_pid_get_session(pid, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_SESSION=", t);
+
+ if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) {
+ r = asprintf(&t, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid);
+ if (r > 0)
+ iovec[(*n_iovec)++] = IOVEC_MAKE_STRING(t);
+ }
+
+ if (sd_pid_get_slice(pid, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_SLICE=", t);
+
+ if (get_process_cmdline(pid, 0, false, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_CMDLINE=", t);
+
+ if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_CGROUP=", t);
+
+ if (compose_open_fds(pid, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_OPEN_FDS=", t);
+
+ p = procfs_file_alloca(pid, "status");
+ if (read_full_file(p, &t, NULL) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_STATUS=", t);
+
+ p = procfs_file_alloca(pid, "maps");
+ if (read_full_file(p, &t, NULL) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_MAPS=", t);
+
+ p = procfs_file_alloca(pid, "limits");
+ if (read_full_file(p, &t, NULL) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_LIMITS=", t);
+
+ p = procfs_file_alloca(pid, "cgroup");
+ if (read_full_file(p, &t, NULL) >=0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_CGROUP=", t);
+
+ p = procfs_file_alloca(pid, "mountinfo");
+ if (read_full_file(p, &t, NULL) >=0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_PROC_MOUNTINFO=", t);
+
+ if (get_process_cwd(pid, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_CWD=", t);
+
+ if (get_process_root(pid, &t) >= 0) {
+ bool proc_self_root_is_slash;
+
+ proc_self_root_is_slash = strcmp(t, "/") == 0;
+
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_ROOT=", t);
+
+ /* If the process' root is "/", then there is a chance it has
+ * mounted own root and hence being containerized. */
+ if (proc_self_root_is_slash && get_process_container_parent_cmdline(pid, &t) > 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_CONTAINER_CMDLINE=", t);
+ }
+
+ if (get_process_environ(pid, &t) >= 0)
+ set_iovec_field_free(iovec, n_iovec, "COREDUMP_ENVIRON=", t);
+
+ t = strjoin("COREDUMP_TIMESTAMP=", context[CONTEXT_TIMESTAMP], "000000");
+ if (t)
+ iovec[(*n_iovec)++] = IOVEC_MAKE_STRING(t);
+
+ if (safe_atoi(context[CONTEXT_SIGNAL], &signo) >= 0 && SIGNAL_VALID(signo))
+ set_iovec_string_field(iovec, n_iovec, "COREDUMP_SIGNAL_NAME=SIG", signal_to_string(signo));
+
+ return 0; /* we successfully acquired all metadata */
+}
+
+static int process_kernel(int argc, char* argv[]) {
+
+ char* context[_CONTEXT_MAX] = {};
+ struct iovec iovec[29 + SUBMIT_COREDUMP_FIELDS];
+ size_t i, n_iovec, n_to_free = 0;
+ int r;
+
+ log_debug("Processing coredump received from the kernel...");
+
+ if (argc < CONTEXT_COMM + 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Not enough arguments passed by the kernel (%i, expected %i).",
+ argc - 1, CONTEXT_COMM + 1 - 1);
+
+ context[CONTEXT_PID] = argv[1 + CONTEXT_PID];
+ context[CONTEXT_UID] = argv[1 + CONTEXT_UID];
+ context[CONTEXT_GID] = argv[1 + CONTEXT_GID];
+ context[CONTEXT_SIGNAL] = argv[1 + CONTEXT_SIGNAL];
+ context[CONTEXT_TIMESTAMP] = argv[1 + CONTEXT_TIMESTAMP];
+ context[CONTEXT_RLIMIT] = argv[1 + CONTEXT_RLIMIT];
+ context[CONTEXT_HOSTNAME] = argv[1 + CONTEXT_HOSTNAME];
+
+ r = gather_pid_metadata(context, argv + 1 + CONTEXT_COMM, iovec, &n_to_free);
+ if (r < 0)
+ goto finish;
+
+ n_iovec = n_to_free;
+
+ iovec[n_iovec++] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_COREDUMP_STR);
+
+ assert_cc(2 == LOG_CRIT);
+ iovec[n_iovec++] = IOVEC_MAKE_STRING("PRIORITY=2");
+
+ assert(n_iovec <= ELEMENTSOF(iovec));
+
+ if (is_journald_crash((const char**) context) || is_pid1_crash((const char**) context))
+ r = submit_coredump((const char**) context,
+ iovec, ELEMENTSOF(iovec), n_iovec,
+ STDIN_FILENO);
+ else
+ r = send_iovec(iovec, n_iovec, STDIN_FILENO);
+
+ finish:
+ for (i = 0; i < n_to_free; i++)
+ free(iovec[i].iov_base);
+
+ /* Those fields are allocated by gather_pid_metadata */
+ free(context[CONTEXT_COMM]);
+ free(context[CONTEXT_EXE]);
+ free(context[CONTEXT_UNIT]);
+
+ return r;
+}
+
+static int process_backtrace(int argc, char *argv[]) {
+ char *context[_CONTEXT_MAX] = {};
+ _cleanup_free_ char *message = NULL;
+ _cleanup_free_ struct iovec *iovec = NULL;
+ size_t n_iovec, n_allocated, n_to_free = 0, i;
+ int r;
+ JournalImporter importer = {
+ .fd = STDIN_FILENO,
+ };
+
+ log_debug("Processing backtrace on stdin...");
+
+ if (argc < CONTEXT_COMM + 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Not enough arguments passed (%i, expected %i).",
+ argc - 1, CONTEXT_COMM + 1 - 1);
+
+ context[CONTEXT_PID] = argv[2 + CONTEXT_PID];
+ context[CONTEXT_UID] = argv[2 + CONTEXT_UID];
+ context[CONTEXT_GID] = argv[2 + CONTEXT_GID];
+ context[CONTEXT_SIGNAL] = argv[2 + CONTEXT_SIGNAL];
+ context[CONTEXT_TIMESTAMP] = argv[2 + CONTEXT_TIMESTAMP];
+ context[CONTEXT_RLIMIT] = argv[2 + CONTEXT_RLIMIT];
+ context[CONTEXT_HOSTNAME] = argv[2 + CONTEXT_HOSTNAME];
+
+ n_allocated = 34 + COREDUMP_STORAGE_EXTERNAL;
+ /* 26 metadata, 2 static, +unknown input, 4 storage, rounded up */
+ iovec = new(struct iovec, n_allocated);
+ if (!iovec)
+ return log_oom();
+
+ r = gather_pid_metadata(context, argv + 2 + CONTEXT_COMM, iovec, &n_to_free);
+ if (r < 0)
+ goto finish;
+ if (r > 0) {
+ /* This was a special crash, and has already been processed. */
+ r = 0;
+ goto finish;
+ }
+ n_iovec = n_to_free;
+
+ for (;;) {
+ r = journal_importer_process_data(&importer);
+ if (r < 0) {
+ log_error_errno(r, "Failed to parse journal entry on stdin: %m");
+ goto finish;
+ }
+ if (r == 1 || /* complete entry */
+ journal_importer_eof(&importer)) /* end of data */
+ break;
+ }
+
+ if (!GREEDY_REALLOC(iovec, n_allocated, n_iovec + importer.iovw.count + 2))
+ return log_oom();
+
+ if (journal_importer_eof(&importer)) {
+ log_warning("Did not receive a full journal entry on stdin, ignoring message sent by reporter");
+
+ message = strjoin("MESSAGE=Process ", context[CONTEXT_PID],
+ " (", context[CONTEXT_COMM], ")"
+ " of user ", context[CONTEXT_UID],
+ " failed with ", context[CONTEXT_SIGNAL]);
+ if (!message) {
+ r = log_oom();
+ goto finish;
+ }
+ iovec[n_iovec++] = IOVEC_MAKE_STRING(message);
+ } else {
+ for (i = 0; i < importer.iovw.count; i++)
+ iovec[n_iovec++] = importer.iovw.iovec[i];
+ }
+
+ iovec[n_iovec++] = IOVEC_MAKE_STRING("MESSAGE_ID=" SD_MESSAGE_BACKTRACE_STR);
+ assert_cc(2 == LOG_CRIT);
+ iovec[n_iovec++] = IOVEC_MAKE_STRING("PRIORITY=2");
+
+ assert(n_iovec <= n_allocated);
+
+ r = sd_journal_sendv(iovec, n_iovec);
+ if (r < 0)
+ log_error_errno(r, "Failed to log backtrace: %m");
+
+ finish:
+ for (i = 0; i < n_to_free; i++)
+ free(iovec[i].iov_base);
+
+ /* Those fields are allocated by gather_pid_metadata */
+ free(context[CONTEXT_COMM]);
+ free(context[CONTEXT_EXE]);
+ free(context[CONTEXT_UNIT]);
+
+ return r;
+}
+
+static int run(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)
+ return log_error_errno(r, "Failed to determine the number of file descriptors: %m");
+
+ /* If we got an fd passed, we are running in coredumpd mode. Otherwise we
+ * are invoked from the kernel as coredump handler. */
+ if (r == 0) {
+ if (streq_ptr(argv[1], "--backtrace"))
+ return process_backtrace(argc, argv);
+ else
+ return process_kernel(argc, argv);
+ } else if (r == 1)
+ return process_socket(SD_LISTEN_FDS_START);
+
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Received unexpected number of file descriptors.");
+}
+
+DEFINE_MAIN_FUNCTION(run);
diff --git a/src/coredump/coredump.conf b/src/coredump/coredump.conf
new file mode 100644
index 0000000..c2f0643
--- /dev/null
+++ b/src/coredump/coredump.conf
@@ -0,0 +1,21 @@
+# This file is part of systemd.
+#
+# 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.
+#
+# Entries in this file show the compile time defaults.
+# You can change settings by editing this file.
+# Defaults can be restored by simply deleting this file.
+#
+# See coredump.conf(5) for details.
+
+[Coredump]
+#Storage=external
+#Compress=yes
+#ProcessSizeMax=2G
+#ExternalSizeMax=2G
+#JournalSizeMax=767M
+#MaxUse=
+#KeepFree=
diff --git a/src/coredump/coredumpctl.c b/src/coredump/coredumpctl.c
new file mode 100644
index 0000000..fbee242
--- /dev/null
+++ b/src/coredump/coredumpctl.c
@@ -0,0 +1,1096 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <fcntl.h>
+#include <getopt.h>
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "sd-bus.h"
+#include "sd-journal.h"
+#include "sd-messages.h"
+
+#include "alloc-util.h"
+#include "bus-error.h"
+#include "bus-util.h"
+#include "compress.h"
+#include "def.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "journal-internal.h"
+#include "journal-util.h"
+#include "log.h"
+#include "macro.h"
+#include "main-func.h"
+#include "pager.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "process-util.h"
+#include "rlimit-util.h"
+#include "sigbus.h"
+#include "signal-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "tmpfile-util.h"
+#include "user-util.h"
+#include "util.h"
+#include "verbs.h"
+
+#define SHORT_BUS_CALL_TIMEOUT_USEC (3 * USEC_PER_SEC)
+
+static usec_t arg_since = USEC_INFINITY, arg_until = USEC_INFINITY;
+static const char* arg_field = NULL;
+static const char *arg_debugger = NULL;
+static const char *arg_directory = NULL;
+static PagerFlags arg_pager_flags = 0;
+static int arg_no_legend = false;
+static int arg_one = false;
+static const char* arg_output = NULL;
+static bool arg_reverse = false;
+static bool arg_quiet = false;
+
+static int add_match(sd_journal *j, const char *match) {
+ _cleanup_free_ char *p = NULL;
+ const char* prefix, *pattern;
+ pid_t pid;
+ int r;
+
+ if (strchr(match, '='))
+ prefix = "";
+ else if (strchr(match, '/')) {
+ r = path_make_absolute_cwd(match, &p);
+ if (r < 0)
+ return log_error_errno(r, "path_make_absolute_cwd(\"%s\"): %m", match);
+
+ match = p;
+ prefix = "COREDUMP_EXE=";
+ } else if (parse_pid(match, &pid) >= 0)
+ prefix = "COREDUMP_PID=";
+ else
+ prefix = "COREDUMP_COMM=";
+
+ pattern = strjoina(prefix, match);
+ log_debug("Adding match: %s", pattern);
+ r = sd_journal_add_match(j, pattern, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add match \"%s\": %m", match);
+
+ return 0;
+}
+
+static int add_matches(sd_journal *j, char **matches) {
+ char **match;
+ int r;
+
+ r = sd_journal_add_match(j, "MESSAGE_ID=" SD_MESSAGE_COREDUMP_STR, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add match \"%s\": %m", "MESSAGE_ID=" SD_MESSAGE_COREDUMP_STR);
+
+ r = sd_journal_add_match(j, "MESSAGE_ID=" SD_MESSAGE_BACKTRACE_STR, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add match \"%s\": %m", "MESSAGE_ID=" SD_MESSAGE_BACKTRACE_STR);
+
+ STRV_FOREACH(match, matches) {
+ r = add_match(j, *match);
+ if (r < 0)
+ return r;
+ }
+
+ return 0;
+}
+
+static int acquire_journal(sd_journal **ret, char **matches) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ int r;
+
+ assert(ret);
+
+ if (arg_directory) {
+ r = sd_journal_open_directory(&j, arg_directory, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open journals in directory: %s: %m", arg_directory);
+ } else {
+ r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
+ if (r < 0)
+ return log_error_errno(r, "Failed to open journal: %m");
+ }
+
+ r = journal_access_check_and_warn(j, arg_quiet, true);
+ if (r < 0)
+ return r;
+
+ r = add_matches(j, matches);
+ if (r < 0)
+ return r;
+
+ if (DEBUG_LOGGING) {
+ _cleanup_free_ char *filter;
+
+ filter = journal_make_match_string(j);
+ log_debug("Journal filter: %s", filter);
+ }
+
+ *ret = TAKE_PTR(j);
+
+ return 0;
+}
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("coredumpctl", "1", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s [OPTIONS...]\n\n"
+ "List or retrieve coredumps from the journal.\n\n"
+ "Flags:\n"
+ " -h --help Show this help\n"
+ " --version Print version string\n"
+ " --no-pager Do not pipe output into a pager\n"
+ " --no-legend Do not print the column headers\n"
+ " --debugger=DEBUGGER Use the given debugger\n"
+ " -1 Show information about most recent entry only\n"
+ " -S --since=DATE Only print coredumps since the date\n"
+ " -U --until=DATE Only print coredumps until the date\n"
+ " -r --reverse Show the newest entries first\n"
+ " -F --field=FIELD List all values a certain field takes\n"
+ " -o --output=FILE Write output to FILE\n"
+ " -D --directory=DIR Use journal files from directory\n\n"
+ " -q --quiet Do not show info messages and privilege warning\n"
+ "Commands:\n"
+ " list [MATCHES...] List available coredumps (default)\n"
+ " info [MATCHES...] Show detailed information about one or more coredumps\n"
+ " dump [MATCHES...] Print first matching coredump to stdout\n"
+ " debug [MATCHES...] Start a debugger for the first matching coredump\n"
+ "\nSee the %s for details.\n"
+ , program_invocation_short_name
+ , link
+ );
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_NO_PAGER,
+ ARG_NO_LEGEND,
+ ARG_DEBUGGER,
+ };
+
+ int c, r;
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version" , no_argument, NULL, ARG_VERSION },
+ { "no-pager", no_argument, NULL, ARG_NO_PAGER },
+ { "no-legend", no_argument, NULL, ARG_NO_LEGEND },
+ { "debugger", required_argument, NULL, ARG_DEBUGGER },
+ { "output", required_argument, NULL, 'o' },
+ { "field", required_argument, NULL, 'F' },
+ { "directory", required_argument, NULL, 'D' },
+ { "reverse", no_argument, NULL, 'r' },
+ { "since", required_argument, NULL, 'S' },
+ { "until", required_argument, NULL, 'U' },
+ { "quiet", no_argument, NULL, 'q' },
+ {}
+ };
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "ho:F:1D:rS:U:q", options, NULL)) >= 0)
+ switch(c) {
+ case 'h':
+ return help();
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_NO_PAGER:
+ arg_pager_flags |= PAGER_DISABLE;
+ break;
+
+ case ARG_NO_LEGEND:
+ arg_no_legend = true;
+ break;
+
+ case ARG_DEBUGGER:
+ arg_debugger = optarg;
+ break;
+
+ case 'o':
+ if (arg_output)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot set output more than once.");
+
+ arg_output = optarg;
+ break;
+
+ case 'S':
+ r = parse_timestamp(optarg, &arg_since);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse timestamp '%s': %m", optarg);
+ break;
+
+ case 'U':
+ r = parse_timestamp(optarg, &arg_until);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse timestamp '%s': %m", optarg);
+ break;
+
+ case 'F':
+ if (arg_field)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot use --field/-F more than once.");
+ arg_field = optarg;
+ break;
+
+ case '1':
+ arg_one = true;
+ break;
+
+ case 'D':
+ arg_directory = optarg;
+ break;
+
+ case 'r':
+ arg_reverse = true;
+ break;
+
+ case 'q':
+ arg_quiet = true;
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unhandled option");
+ }
+
+ if (arg_since != USEC_INFINITY && arg_until != USEC_INFINITY &&
+ arg_since > arg_until)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "--since= must be before --until=.");
+
+ return 1;
+}
+
+static int retrieve(const void *data,
+ size_t len,
+ const char *name,
+ char **var) {
+
+ size_t ident;
+ char *v;
+
+ ident = strlen(name) + 1; /* name + "=" */
+
+ if (len < ident)
+ return 0;
+
+ if (memcmp(data, name, ident - 1) != 0)
+ return 0;
+
+ if (((const char*) data)[ident - 1] != '=')
+ return 0;
+
+ v = strndup((const char*)data + ident, len - ident);
+ if (!v)
+ return log_oom();
+
+ free(*var);
+ *var = v;
+
+ return 1;
+}
+
+static int print_field(FILE* file, sd_journal *j) {
+ const void *d;
+ size_t l;
+
+ assert(file);
+ assert(j);
+
+ assert(arg_field);
+
+ /* A (user-specified) field may appear more than once for a given entry.
+ * We will print all of the occurences.
+ * This is different below for fields that systemd-coredump uses,
+ * because they cannot meaningfully appear more than once.
+ */
+ SD_JOURNAL_FOREACH_DATA(j, d, l) {
+ _cleanup_free_ char *value = NULL;
+ int r;
+
+ r = retrieve(d, l, arg_field, &value);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ fprintf(file, "%s\n", value);
+ }
+
+ return 0;
+}
+
+#define RETRIEVE(d, l, name, arg) \
+ { \
+ int _r = retrieve(d, l, name, &arg); \
+ if (_r < 0) \
+ return _r; \
+ if (_r > 0) \
+ continue; \
+ }
+
+static int print_list(FILE* file, sd_journal *j, int had_legend) {
+ _cleanup_free_ char
+ *mid = NULL, *pid = NULL, *uid = NULL, *gid = NULL,
+ *sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
+ *filename = NULL, *truncated = NULL, *coredump = NULL;
+ const void *d;
+ size_t l;
+ usec_t t;
+ char buf[FORMAT_TIMESTAMP_MAX];
+ int r;
+ const char *present;
+ bool normal_coredump;
+
+ assert(file);
+ assert(j);
+
+ SD_JOURNAL_FOREACH_DATA(j, d, l) {
+ RETRIEVE(d, l, "MESSAGE_ID", mid);
+ RETRIEVE(d, l, "COREDUMP_PID", pid);
+ RETRIEVE(d, l, "COREDUMP_UID", uid);
+ RETRIEVE(d, l, "COREDUMP_GID", gid);
+ RETRIEVE(d, l, "COREDUMP_SIGNAL", sgnl);
+ RETRIEVE(d, l, "COREDUMP_EXE", exe);
+ RETRIEVE(d, l, "COREDUMP_COMM", comm);
+ RETRIEVE(d, l, "COREDUMP_CMDLINE", cmdline);
+ RETRIEVE(d, l, "COREDUMP_FILENAME", filename);
+ RETRIEVE(d, l, "COREDUMP_TRUNCATED", truncated);
+ RETRIEVE(d, l, "COREDUMP", coredump);
+ }
+
+ if (!pid && !uid && !gid && !sgnl && !exe && !comm && !cmdline && !filename) {
+ log_warning("Empty coredump log entry");
+ return -EINVAL;
+ }
+
+ r = sd_journal_get_realtime_usec(j, &t);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get realtime timestamp: %m");
+
+ format_timestamp(buf, sizeof(buf), t);
+
+ if (!had_legend && !arg_no_legend)
+ fprintf(file, "%-*s %*s %*s %*s %*s %-*s %s\n",
+ FORMAT_TIMESTAMP_WIDTH, "TIME",
+ 6, "PID",
+ 5, "UID",
+ 5, "GID",
+ 3, "SIG",
+ 9, "COREFILE",
+ "EXE");
+
+ normal_coredump = streq_ptr(mid, SD_MESSAGE_COREDUMP_STR);
+
+ if (filename)
+ if (access(filename, R_OK) == 0)
+ present = "present";
+ else if (errno == ENOENT)
+ present = "missing";
+ else
+ present = "error";
+ else if (coredump)
+ present = "journal";
+ else if (normal_coredump)
+ present = "none";
+ else
+ present = "-";
+
+ if (STR_IN_SET(present, "present", "journal") && truncated && parse_boolean(truncated) > 0)
+ present = "truncated";
+
+ fprintf(file, "%-*s %*s %*s %*s %*s %-*s %s\n",
+ FORMAT_TIMESTAMP_WIDTH, buf,
+ 6, strna(pid),
+ 5, strna(uid),
+ 5, strna(gid),
+ 3, normal_coredump ? strna(sgnl) : "-",
+ 9, present,
+ strna(exe ?: (comm ?: cmdline)));
+
+ return 0;
+}
+
+static int print_info(FILE *file, sd_journal *j, bool need_space) {
+ _cleanup_free_ char
+ *mid = NULL, *pid = NULL, *uid = NULL, *gid = NULL,
+ *sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
+ *unit = NULL, *user_unit = NULL, *session = NULL,
+ *boot_id = NULL, *machine_id = NULL, *hostname = NULL,
+ *slice = NULL, *cgroup = NULL, *owner_uid = NULL,
+ *message = NULL, *timestamp = NULL, *filename = NULL,
+ *truncated = NULL, *coredump = NULL;
+ const void *d;
+ size_t l;
+ bool normal_coredump;
+ int r;
+
+ assert(file);
+ assert(j);
+
+ SD_JOURNAL_FOREACH_DATA(j, d, l) {
+ RETRIEVE(d, l, "MESSAGE_ID", mid);
+ RETRIEVE(d, l, "COREDUMP_PID", pid);
+ RETRIEVE(d, l, "COREDUMP_UID", uid);
+ RETRIEVE(d, l, "COREDUMP_GID", gid);
+ RETRIEVE(d, l, "COREDUMP_SIGNAL", sgnl);
+ RETRIEVE(d, l, "COREDUMP_EXE", exe);
+ RETRIEVE(d, l, "COREDUMP_COMM", comm);
+ RETRIEVE(d, l, "COREDUMP_CMDLINE", cmdline);
+ RETRIEVE(d, l, "COREDUMP_UNIT", unit);
+ RETRIEVE(d, l, "COREDUMP_USER_UNIT", user_unit);
+ RETRIEVE(d, l, "COREDUMP_SESSION", session);
+ RETRIEVE(d, l, "COREDUMP_OWNER_UID", owner_uid);
+ RETRIEVE(d, l, "COREDUMP_SLICE", slice);
+ RETRIEVE(d, l, "COREDUMP_CGROUP", cgroup);
+ RETRIEVE(d, l, "COREDUMP_TIMESTAMP", timestamp);
+ RETRIEVE(d, l, "COREDUMP_FILENAME", filename);
+ RETRIEVE(d, l, "COREDUMP_TRUNCATED", truncated);
+ RETRIEVE(d, l, "COREDUMP", coredump);
+ RETRIEVE(d, l, "_BOOT_ID", boot_id);
+ RETRIEVE(d, l, "_MACHINE_ID", machine_id);
+ RETRIEVE(d, l, "_HOSTNAME", hostname);
+ RETRIEVE(d, l, "MESSAGE", message);
+ }
+
+ if (need_space)
+ fputs("\n", file);
+
+ normal_coredump = streq_ptr(mid, SD_MESSAGE_COREDUMP_STR);
+
+ if (comm)
+ fprintf(file,
+ " PID: %s%s%s (%s)\n",
+ ansi_highlight(), strna(pid), ansi_normal(), comm);
+ else
+ fprintf(file,
+ " PID: %s%s%s\n",
+ ansi_highlight(), strna(pid), ansi_normal());
+
+ if (uid) {
+ uid_t n;
+
+ if (parse_uid(uid, &n) >= 0) {
+ _cleanup_free_ char *u = NULL;
+
+ u = uid_to_name(n);
+ fprintf(file,
+ " UID: %s (%s)\n",
+ uid, u);
+ } else {
+ fprintf(file,
+ " UID: %s\n",
+ uid);
+ }
+ }
+
+ if (gid) {
+ gid_t n;
+
+ if (parse_gid(gid, &n) >= 0) {
+ _cleanup_free_ char *g = NULL;
+
+ g = gid_to_name(n);
+ fprintf(file,
+ " GID: %s (%s)\n",
+ gid, g);
+ } else {
+ fprintf(file,
+ " GID: %s\n",
+ gid);
+ }
+ }
+
+ if (sgnl) {
+ int sig;
+ const char *name = normal_coredump ? "Signal" : "Reason";
+
+ if (normal_coredump && safe_atoi(sgnl, &sig) >= 0)
+ fprintf(file, " %s: %s (%s)\n", name, sgnl, signal_to_string(sig));
+ else
+ fprintf(file, " %s: %s\n", name, sgnl);
+ }
+
+ if (timestamp) {
+ usec_t u;
+
+ r = safe_atou64(timestamp, &u);
+ if (r >= 0) {
+ char absolute[FORMAT_TIMESTAMP_MAX], relative[FORMAT_TIMESPAN_MAX];
+
+ fprintf(file,
+ " Timestamp: %s (%s)\n",
+ format_timestamp(absolute, sizeof(absolute), u),
+ format_timestamp_relative(relative, sizeof(relative), u));
+
+ } else
+ fprintf(file, " Timestamp: %s\n", timestamp);
+ }
+
+ if (cmdline)
+ fprintf(file, " Command Line: %s\n", cmdline);
+ if (exe)
+ fprintf(file, " Executable: %s%s%s\n", ansi_highlight(), exe, ansi_normal());
+ if (cgroup)
+ fprintf(file, " Control Group: %s\n", cgroup);
+ if (unit)
+ fprintf(file, " Unit: %s\n", unit);
+ if (user_unit)
+ fprintf(file, " User Unit: %s\n", user_unit);
+ if (slice)
+ fprintf(file, " Slice: %s\n", slice);
+ if (session)
+ fprintf(file, " Session: %s\n", session);
+ if (owner_uid) {
+ uid_t n;
+
+ if (parse_uid(owner_uid, &n) >= 0) {
+ _cleanup_free_ char *u = NULL;
+
+ u = uid_to_name(n);
+ fprintf(file,
+ " Owner UID: %s (%s)\n",
+ owner_uid, u);
+ } else {
+ fprintf(file,
+ " Owner UID: %s\n",
+ owner_uid);
+ }
+ }
+ if (boot_id)
+ fprintf(file, " Boot ID: %s\n", boot_id);
+ if (machine_id)
+ fprintf(file, " Machine ID: %s\n", machine_id);
+ if (hostname)
+ fprintf(file, " Hostname: %s\n", hostname);
+
+ if (filename) {
+ bool inacc, trunc;
+
+ inacc = access(filename, R_OK) < 0;
+ trunc = truncated && parse_boolean(truncated) > 0;
+
+ if (inacc || trunc)
+ fprintf(file, " Storage: %s%s (%s%s%s)%s\n",
+ ansi_highlight_red(),
+ filename,
+ inacc ? "inaccessible" : "",
+ inacc && trunc ? ", " : "",
+ trunc ? "truncated" : "",
+ ansi_normal());
+ else
+ fprintf(file, " Storage: %s\n", filename);
+ }
+
+ else if (coredump)
+ fprintf(file, " Storage: journal\n");
+ else
+ fprintf(file, " Storage: none\n");
+
+ if (message) {
+ _cleanup_free_ char *m = NULL;
+
+ m = strreplace(message, "\n", "\n ");
+
+ fprintf(file, " Message: %s\n", strstrip(m ?: message));
+ }
+
+ return 0;
+}
+
+static int focus(sd_journal *j) {
+ int r;
+
+ r = sd_journal_seek_tail(j);
+ if (r == 0)
+ r = sd_journal_previous(j);
+ if (r < 0)
+ return log_error_errno(r, "Failed to search journal: %m");
+ if (r == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ESRCH),
+ "No match found.");
+ return r;
+}
+
+static int print_entry(sd_journal *j, unsigned n_found, bool verb_is_info) {
+ assert(j);
+
+ if (verb_is_info)
+ return print_info(stdout, j, n_found);
+ else if (arg_field)
+ return print_field(stdout, j);
+ else
+ return print_list(stdout, j, n_found);
+}
+
+static int dump_list(int argc, char **argv, void *userdata) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ unsigned n_found = 0;
+ bool verb_is_info;
+ int r;
+
+ verb_is_info = (argc >= 1 && streq(argv[0], "info"));
+
+ r = acquire_journal(&j, argv + 1);
+ if (r < 0)
+ return r;
+
+ (void) pager_open(arg_pager_flags);
+
+ /* The coredumps are likely to compressed, and for just
+ * listing them we don't need to decompress them, so let's
+ * pick a fairly low data threshold here */
+ sd_journal_set_data_threshold(j, 4096);
+
+ /* "info" without pattern implies "-1" */
+ if (arg_one || (verb_is_info && argc == 1)) {
+ r = focus(j);
+ if (r < 0)
+ return r;
+
+ return print_entry(j, 0, verb_is_info);
+ } else {
+ if (arg_since != USEC_INFINITY && !arg_reverse)
+ r = sd_journal_seek_realtime_usec(j, arg_since);
+ else if (arg_until != USEC_INFINITY && arg_reverse)
+ r = sd_journal_seek_realtime_usec(j, arg_until);
+ else if (arg_reverse)
+ r = sd_journal_seek_tail(j);
+ else
+ r = sd_journal_seek_head(j);
+ if (r < 0)
+ return log_error_errno(r, "Failed to seek to date: %m");
+
+ for (;;) {
+ if (!arg_reverse)
+ r = sd_journal_next(j);
+ else
+ r = sd_journal_previous(j);
+
+ if (r < 0)
+ return log_error_errno(r, "Failed to iterate through journal: %m");
+
+ if (r == 0)
+ break;
+
+ if (arg_until != USEC_INFINITY && !arg_reverse) {
+ usec_t usec;
+
+ r = sd_journal_get_realtime_usec(j, &usec);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine timestamp: %m");
+ if (usec > arg_until)
+ continue;
+ }
+
+ if (arg_since != USEC_INFINITY && arg_reverse) {
+ usec_t usec;
+
+ r = sd_journal_get_realtime_usec(j, &usec);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine timestamp: %m");
+ if (usec < arg_since)
+ continue;
+ }
+
+ r = print_entry(j, n_found++, verb_is_info);
+ if (r < 0)
+ return r;
+ }
+
+ if (!arg_field && n_found <= 0) {
+ if (!arg_quiet)
+ log_notice("No coredumps found.");
+ return -ESRCH;
+ }
+ }
+
+ return 0;
+}
+
+static int save_core(sd_journal *j, FILE *file, char **path, bool *unlink_temp) {
+ const char *data;
+ _cleanup_free_ char *filename = NULL;
+ size_t len;
+ int r, fd;
+ _cleanup_close_ int fdt = -1;
+ char *temp = NULL;
+
+ assert(!(file && path)); /* At most one can be specified */
+ assert(!!path == !!unlink_temp); /* Those must be specified together */
+
+ /* Look for a coredump on disk first. */
+ r = sd_journal_get_data(j, "COREDUMP_FILENAME", (const void**) &data, &len);
+ if (r == 0)
+ retrieve(data, len, "COREDUMP_FILENAME", &filename);
+ else {
+ if (r != -ENOENT)
+ return log_error_errno(r, "Failed to retrieve COREDUMP_FILENAME field: %m");
+ /* Check that we can have a COREDUMP field. We still haven't set a high
+ * data threshold, so we'll get a few kilobytes at most.
+ */
+
+ r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
+ if (r == -ENOENT)
+ return log_error_errno(r, "Coredump entry has no core attached (neither internally in the journal nor externally on disk).");
+ if (r < 0)
+ return log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
+ }
+
+ if (filename) {
+ if (access(filename, R_OK) < 0)
+ return log_error_errno(errno, "File \"%s\" is not readable: %m", filename);
+
+ if (path && !endswith(filename, ".xz") && !endswith(filename, ".lz4")) {
+ *path = TAKE_PTR(filename);
+
+ return 0;
+ }
+ }
+
+ if (path) {
+ const char *vt;
+
+ /* Create a temporary file to write the uncompressed core to. */
+
+ r = var_tmp_dir(&vt);
+ if (r < 0)
+ return log_error_errno(r, "Failed to acquire temporary directory path: %m");
+
+ temp = strjoin(vt, "/coredump-XXXXXX");
+ if (!temp)
+ return log_oom();
+
+ fdt = mkostemp_safe(temp);
+ if (fdt < 0)
+ return log_error_errno(fdt, "Failed to create temporary file: %m");
+ log_debug("Created temporary file %s", temp);
+
+ fd = fdt;
+ } else {
+ /* If neither path or file are specified, we will write to stdout. Let's now check
+ * if stdout is connected to a tty. We checked that the file exists, or that the
+ * core might be stored in the journal. In this second case, if we found the entry,
+ * in all likelyhood we will be able to access the COREDUMP= field. In either case,
+ * we stop before doing any "real" work, i.e. before starting decompression or
+ * reading from the file or creating temporary files.
+ */
+ if (!file) {
+ if (on_tty())
+ return log_error_errno(SYNTHETIC_ERRNO(ENOTTY),
+ "Refusing to dump core to tty"
+ " (use shell redirection or specify --output).");
+ file = stdout;
+ }
+
+ fd = fileno(file);
+ }
+
+ if (filename) {
+#if HAVE_XZ || HAVE_LZ4
+ _cleanup_close_ int fdf;
+
+ fdf = open(filename, O_RDONLY | O_CLOEXEC);
+ if (fdf < 0) {
+ r = log_error_errno(errno, "Failed to open %s: %m", filename);
+ goto error;
+ }
+
+ r = decompress_stream(filename, fdf, fd, -1);
+ if (r < 0) {
+ log_error_errno(r, "Failed to decompress %s: %m", filename);
+ goto error;
+ }
+#else
+ log_error("Cannot decompress file. Compiled without compression support.");
+ r = -EOPNOTSUPP;
+ goto error;
+#endif
+ } else {
+ ssize_t sz;
+
+ /* We want full data, nothing truncated. */
+ sd_journal_set_data_threshold(j, 0);
+
+ r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
+ if (r < 0)
+ return log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
+
+ assert(len >= 9);
+ data += 9;
+ len -= 9;
+
+ sz = write(fd, data, len);
+ if (sz < 0) {
+ r = log_error_errno(errno, "Failed to write output: %m");
+ goto error;
+ }
+ if (sz != (ssize_t) len) {
+ log_error("Short write to output.");
+ r = -EIO;
+ goto error;
+ }
+ }
+
+ if (temp) {
+ *path = temp;
+ *unlink_temp = true;
+ }
+ return 0;
+
+error:
+ if (temp) {
+ unlink(temp);
+ log_debug("Removed temporary file %s", temp);
+ }
+ return r;
+}
+
+static int dump_core(int argc, char **argv, void *userdata) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ if (arg_field) {
+ log_error("Option --field/-F only makes sense with list");
+ return -EINVAL;
+ }
+
+ r = acquire_journal(&j, argv + 1);
+ if (r < 0)
+ return r;
+
+ r = focus(j);
+ if (r < 0)
+ return r;
+
+ if (arg_output) {
+ f = fopen(arg_output, "we");
+ if (!f)
+ return log_error_errno(errno, "Failed to open \"%s\" for writing: %m", arg_output);
+ }
+
+ print_info(f ? stdout : stderr, j, false);
+
+ r = save_core(j, f, NULL, NULL);
+ if (r < 0)
+ return r;
+
+ r = sd_journal_previous(j);
+ if (r > 0 && !arg_quiet)
+ log_notice("More than one entry matches, ignoring rest.");
+
+ return 0;
+}
+
+static int run_debug(int argc, char **argv, void *userdata) {
+ _cleanup_(sd_journal_closep) sd_journal *j = NULL;
+ _cleanup_free_ char *exe = NULL, *path = NULL;
+ bool unlink_path = false;
+ const char *data, *fork_name;
+ size_t len;
+ pid_t pid;
+ int r;
+
+ if (!arg_debugger) {
+ char *env_debugger;
+
+ env_debugger = getenv("SYSTEMD_DEBUGGER");
+ if (env_debugger)
+ arg_debugger = env_debugger;
+ else
+ arg_debugger = "gdb";
+ }
+
+ if (arg_field) {
+ log_error("Option --field/-F only makes sense with list");
+ return -EINVAL;
+ }
+
+ r = acquire_journal(&j, argv + 1);
+ if (r < 0)
+ return r;
+
+ r = focus(j);
+ if (r < 0)
+ return r;
+
+ print_info(stdout, j, false);
+ fputs("\n", stdout);
+
+ r = sd_journal_get_data(j, "COREDUMP_EXE", (const void**) &data, &len);
+ if (r < 0)
+ return log_error_errno(r, "Failed to retrieve COREDUMP_EXE field: %m");
+
+ assert(len > STRLEN("COREDUMP_EXE="));
+ data += STRLEN("COREDUMP_EXE=");
+ len -= STRLEN("COREDUMP_EXE=");
+
+ exe = strndup(data, len);
+ if (!exe)
+ return log_oom();
+
+ if (endswith(exe, " (deleted)")) {
+ log_error("Binary already deleted.");
+ return -ENOENT;
+ }
+
+ if (!path_is_absolute(exe)) {
+ log_error("Binary is not an absolute path.");
+ return -ENOENT;
+ }
+
+ r = save_core(j, NULL, &path, &unlink_path);
+ if (r < 0)
+ return r;
+
+ /* Don't interfere with gdb and its handling of SIGINT. */
+ (void) ignore_signals(SIGINT, -1);
+
+ fork_name = strjoina("(", arg_debugger, ")");
+
+ r = safe_fork(fork_name, FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_LOG, &pid);
+ if (r < 0)
+ goto finish;
+ if (r == 0) {
+ execlp(arg_debugger, arg_debugger, exe, "-c", path, NULL);
+ log_open();
+ log_error_errno(errno, "Failed to invoke %s: %m", arg_debugger);
+ _exit(EXIT_FAILURE);
+ }
+
+ r = wait_for_terminate_and_check(arg_debugger, pid, WAIT_LOG_ABNORMAL);
+
+finish:
+ (void) default_signals(SIGINT, -1);
+
+ if (unlink_path) {
+ log_debug("Removed temporary file %s", path);
+ unlink(path);
+ }
+
+ return r;
+}
+
+static int check_units_active(void) {
+ _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
+ _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+ int c = 0, r;
+ const char *id, *state, *substate;
+
+ if (arg_quiet)
+ return false;
+
+ r = sd_bus_default_system(&bus);
+ if (r < 0)
+ return log_error_errno(r, "Failed to acquire bus: %m");
+
+ r = sd_bus_message_new_method_call(
+ bus,
+ &m,
+ "org.freedesktop.systemd1",
+ "/org/freedesktop/systemd1",
+ "org.freedesktop.systemd1.Manager",
+ "ListUnitsByPatterns");
+ if (r < 0)
+ return bus_log_create_error(r);
+
+ r = sd_bus_message_append_strv(m, NULL);
+ if (r < 0)
+ return bus_log_create_error(r);
+
+ r = sd_bus_message_append_strv(m, STRV_MAKE("systemd-coredump@*.service"));
+ if (r < 0)
+ return bus_log_create_error(r);
+
+ r = sd_bus_call(bus, m, SHORT_BUS_CALL_TIMEOUT_USEC, &error, &reply);
+ if (r < 0)
+ return log_error_errno(r, "Failed to check if any systemd-coredump@.service units are running: %s",
+ bus_error_message(&error, r));
+
+ r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "(ssssssouso)");
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ while ((r = sd_bus_message_read(
+ reply, "(ssssssouso)",
+ &id, NULL, NULL, &state, &substate,
+ NULL, NULL, NULL, NULL, NULL)) > 0) {
+ bool found = !STR_IN_SET(state, "inactive", "dead", "failed");
+ log_debug("Unit %s is %s/%s, %scounting it.", id, state, substate, found ? "" : "not ");
+ c += found;
+ }
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ r = sd_bus_message_exit_container(reply);
+ if (r < 0)
+ return bus_log_parse_error(r);
+
+ return c;
+}
+
+static int coredumpctl_main(int argc, char *argv[]) {
+
+ static const Verb verbs[] = {
+ { "list", VERB_ANY, VERB_ANY, VERB_DEFAULT, dump_list },
+ { "info", VERB_ANY, VERB_ANY, 0, dump_list },
+ { "dump", VERB_ANY, VERB_ANY, 0, dump_core },
+ { "debug", VERB_ANY, VERB_ANY, 0, run_debug },
+ { "gdb", VERB_ANY, VERB_ANY, 0, run_debug },
+ {}
+ };
+
+ return dispatch_verb(argc, argv, verbs, NULL);
+}
+
+static int run(int argc, char *argv[]) {
+ int r, units_active;
+
+ setlocale(LC_ALL, "");
+ log_parse_environment();
+ log_open();
+
+ /* The journal merging logic potentially needs a lot of fds. */
+ (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ sigbus_install();
+
+ units_active = check_units_active(); /* error is treated the same as 0 */
+
+ r = coredumpctl_main(argc, argv);
+
+ if (units_active > 0)
+ printf("%s-- Notice: %d systemd-coredump@.service %s, output may be incomplete.%s\n",
+ ansi_highlight_red(),
+ units_active, units_active == 1 ? "unit is running" : "units are running",
+ ansi_normal());
+ return r;
+}
+
+DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
diff --git a/src/coredump/meson.build b/src/coredump/meson.build
new file mode 100644
index 0000000..7fa5942
--- /dev/null
+++ b/src/coredump/meson.build
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: LGPL-2.1+
+
+systemd_coredump_sources = files('''
+ coredump.c
+ coredump-vacuum.c
+ coredump-vacuum.h
+'''.split())
+
+if conf.get('HAVE_ELFUTILS') == 1
+ systemd_coredump_sources += files(['stacktrace.c',
+ 'stacktrace.h'])
+endif
+
+coredumpctl_sources = files('coredumpctl.c')
+
+if conf.get('ENABLE_COREDUMP') == 1
+ install_data('coredump.conf',
+ install_dir : pkgsysconfdir)
+endif
+
+tests += [
+ [['src/coredump/test-coredump-vacuum.c',
+ 'src/coredump/coredump-vacuum.c',
+ 'src/coredump/coredump-vacuum.h'],
+ [],
+ [],
+ 'ENABLE_COREDUMP', 'manual'],
+]
diff --git a/src/coredump/stacktrace.c b/src/coredump/stacktrace.c
new file mode 100644
index 0000000..dab4c1a
--- /dev/null
+++ b/src/coredump/stacktrace.c
@@ -0,0 +1,185 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <dwarf.h>
+#include <elfutils/libdwfl.h>
+#include <stdio_ext.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "format-util.h"
+#include "macro.h"
+#include "stacktrace.h"
+#include "string-util.h"
+#include "util.h"
+
+#define FRAMES_MAX 64
+#define THREADS_MAX 64
+
+struct stack_context {
+ FILE *f;
+ Dwfl *dwfl;
+ Elf *elf;
+ unsigned n_thread;
+ unsigned n_frame;
+};
+
+static int frame_callback(Dwfl_Frame *frame, void *userdata) {
+ struct stack_context *c = userdata;
+ Dwarf_Addr pc, pc_adjusted, bias = 0;
+ _cleanup_free_ Dwarf_Die *scopes = NULL;
+ const char *fname = NULL, *symbol = NULL;
+ Dwfl_Module *module;
+ bool is_activation;
+
+ assert(frame);
+ assert(c);
+
+ if (c->n_frame >= FRAMES_MAX)
+ return DWARF_CB_ABORT;
+
+ if (!dwfl_frame_pc(frame, &pc, &is_activation))
+ return DWARF_CB_ABORT;
+
+ pc_adjusted = pc - (is_activation ? 0 : 1);
+
+ module = dwfl_addrmodule(c->dwfl, pc_adjusted);
+ if (module) {
+ Dwarf_Die *s, *cudie;
+ int n;
+
+ cudie = dwfl_module_addrdie(module, pc_adjusted, &bias);
+ if (cudie) {
+ n = dwarf_getscopes(cudie, pc_adjusted - bias, &scopes);
+ for (s = scopes; s < scopes + n; s++) {
+ if (IN_SET(dwarf_tag(s), DW_TAG_subprogram, DW_TAG_inlined_subroutine, DW_TAG_entry_point)) {
+ Dwarf_Attribute *a, space;
+
+ a = dwarf_attr_integrate(s, DW_AT_MIPS_linkage_name, &space);
+ if (!a)
+ a = dwarf_attr_integrate(s, DW_AT_linkage_name, &space);
+ if (a)
+ symbol = dwarf_formstring(a);
+ if (!symbol)
+ symbol = dwarf_diename(s);
+
+ if (symbol)
+ break;
+ }
+ }
+ }
+
+ if (!symbol)
+ symbol = dwfl_module_addrname(module, pc_adjusted);
+
+ fname = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+ }
+
+ fprintf(c->f, "#%-2u 0x%016" PRIx64 " %s (%s)\n", c->n_frame, (uint64_t) pc, strna(symbol), strna(fname));
+ c->n_frame++;
+
+ return DWARF_CB_OK;
+}
+
+static int thread_callback(Dwfl_Thread *thread, void *userdata) {
+ struct stack_context *c = userdata;
+ pid_t tid;
+
+ assert(thread);
+ assert(c);
+
+ if (c->n_thread >= THREADS_MAX)
+ return DWARF_CB_ABORT;
+
+ if (c->n_thread != 0)
+ fputc('\n', c->f);
+
+ c->n_frame = 0;
+
+ tid = dwfl_thread_tid(thread);
+ fprintf(c->f, "Stack trace of thread " PID_FMT ":\n", tid);
+
+ if (dwfl_thread_getframes(thread, frame_callback, c) < 0)
+ return DWARF_CB_ABORT;
+
+ c->n_thread++;
+
+ return DWARF_CB_OK;
+}
+
+int coredump_make_stack_trace(int fd, const char *executable, char **ret) {
+
+ static const Dwfl_Callbacks callbacks = {
+ .find_elf = dwfl_build_id_find_elf,
+ .find_debuginfo = dwfl_standard_find_debuginfo,
+ };
+
+ struct stack_context c = {};
+ char *buf = NULL;
+ size_t sz = 0;
+ int r;
+
+ assert(fd >= 0);
+ assert(ret);
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
+ return -errno;
+
+ c.f = open_memstream(&buf, &sz);
+ if (!c.f)
+ return -ENOMEM;
+
+ (void) __fsetlocking(c.f, FSETLOCKING_BYCALLER);
+
+ elf_version(EV_CURRENT);
+
+ c.elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
+ if (!c.elf) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ c.dwfl = dwfl_begin(&callbacks);
+ if (!c.dwfl) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_core_file_report(c.dwfl, c.elf, executable) < 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_report_end(c.dwfl, NULL, NULL) != 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_core_file_attach(c.dwfl, c.elf) < 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ if (dwfl_getthreads(c.dwfl, thread_callback, &c) < 0) {
+ r = -EINVAL;
+ goto finish;
+ }
+
+ c.f = safe_fclose(c.f);
+
+ *ret = TAKE_PTR(buf);
+
+ r = 0;
+
+finish:
+ if (c.dwfl)
+ dwfl_end(c.dwfl);
+
+ if (c.elf)
+ elf_end(c.elf);
+
+ safe_fclose(c.f);
+
+ free(buf);
+
+ return r;
+}
diff --git a/src/coredump/stacktrace.h b/src/coredump/stacktrace.h
new file mode 100644
index 0000000..5290042
--- /dev/null
+++ b/src/coredump/stacktrace.h
@@ -0,0 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+int coredump_make_stack_trace(int fd, const char *executable, char **ret);
diff --git a/src/coredump/test-coredump-vacuum.c b/src/coredump/test-coredump-vacuum.c
new file mode 100644
index 0000000..75fb442
--- /dev/null
+++ b/src/coredump/test-coredump-vacuum.c
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <stdlib.h>
+
+#include "coredump-vacuum.h"
+
+int main(int argc, char *argv[]) {
+
+ if (coredump_vacuum(-1, (uint64_t) -1, 70 * 1024) < 0)
+ return EXIT_FAILURE;
+
+ return EXIT_SUCCESS;
+}