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-rw-r--r--src/grp-coredump/systemd-coredump/Makefile81
-rw-r--r--src/grp-coredump/systemd-coredump/coredump-vacuum.c268
-rw-r--r--src/grp-coredump/systemd-coredump/coredump-vacuum.h25
-rw-r--r--src/grp-coredump/systemd-coredump/coredump.c1149
-rw-r--r--src/grp-coredump/systemd-coredump/coredump.conf21
-rw-r--r--src/grp-coredump/systemd-coredump/stacktrace.c200
-rw-r--r--src/grp-coredump/systemd-coredump/stacktrace.h22
-rw-r--r--src/grp-coredump/systemd-coredump/test-coredump-vacuum.c30
8 files changed, 1796 insertions, 0 deletions
diff --git a/src/grp-coredump/systemd-coredump/Makefile b/src/grp-coredump/systemd-coredump/Makefile
new file mode 100644
index 0000000000..87ec1799c0
--- /dev/null
+++ b/src/grp-coredump/systemd-coredump/Makefile
@@ -0,0 +1,81 @@
+# -*- Mode: makefile; indent-tabs-mode: t -*-
+#
+# This file is part of systemd.
+#
+# Copyright 2010-2012 Lennart Poettering
+# Copyright 2010-2012 Kay Sievers
+# Copyright 2013 Zbigniew Jędrzejewski-Szmek
+# Copyright 2013 David Strauss
+# Copyright 2016 Luke Shumaker
+#
+# 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 $(dir $(lastword $(MAKEFILE_LIST)))/../../../config.mk
+include $(topsrcdir)/build-aux/Makefile.head.mk
+
+ifneq ($(ENABLE_COREDUMP),)
+systemd_coredump_SOURCES = \
+ src/coredump/coredump.c \
+ src/coredump/coredump-vacuum.c \
+ src/coredump/coredump-vacuum.h
+
+systemd_coredump_LDADD = \
+ libshared.la
+
+ifneq ($(HAVE_ELFUTILS),)
+systemd_coredump_SOURCES += \
+ src/coredump/stacktrace.c \
+ src/coredump/stacktrace.h
+
+systemd_coredump_LDADD += \
+ $(ELFUTILS_LIBS)
+endif # HAVE_ELFUTILS
+
+nodist_systemunit_DATA += \
+ units/systemd-coredump@.service
+
+dist_systemunit_DATA += \
+ units/systemd-coredump.socket
+
+SOCKETS_TARGET_WANTS += \
+ systemd-coredump.socket
+
+libexec_PROGRAMS += \
+ systemd-coredump
+
+dist_pkgsysconf_DATA += \
+ src/coredump/coredump.conf
+
+manual_tests += \
+ test-coredump-vacuum
+
+test_coredump_vacuum_SOURCES = \
+ src/coredump/test-coredump-vacuum.c \
+ src/coredump/coredump-vacuum.c \
+ src/coredump/coredump-vacuum.h
+
+test_coredump_vacuum_LDADD = \
+ libshared.la
+
+nodist_sysctl_DATA = \
+ sysctl.d/50-coredump.conf
+
+CLEANFILES += \
+ sysctl.d/50-coredump.conf
+endif # ENABLE_COREDUMP
+
+EXTRA_DIST += \
+ sysctl.d/50-coredump.conf.in \
+ units/systemd-coredump@.service.in
+
+include $(topsrcdir)/build-aux/Makefile.tail.mk
diff --git a/src/grp-coredump/systemd-coredump/coredump-vacuum.c b/src/grp-coredump/systemd-coredump/coredump-vacuum.c
new file mode 100644
index 0000000000..f02b6dbd87
--- /dev/null
+++ b/src/grp-coredump/systemd-coredump/coredump-vacuum.c
@@ -0,0 +1,268 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2014 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 <sys/statvfs.h>
+
+#include "alloc-util.h"
+#include "coredump-vacuum.h"
+#include "dirent-util.h"
+#include "fd-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_hasmap_free(Hashmap *h) {
+ struct vacuum_candidate *c;
+
+ while ((c = hashmap_steal_first(h)))
+ vacuum_candidate_free(c);
+
+ hashmap_free(h);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Hashmap*, vacuum_candidate_hasmap_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_hasmap_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 = n;
+ n = NULL;
+ }
+
+ 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;
+
+ if (unlinkat(dirfd(d), worst->oldest_file, 0) < 0) {
+
+ if (errno == ENOENT)
+ continue;
+
+ return log_error_errno(errno, "Failed to remove file %s: %m", worst->oldest_file);
+ } else
+ 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/grp-coredump/systemd-coredump/coredump-vacuum.h b/src/grp-coredump/systemd-coredump/coredump-vacuum.h
new file mode 100644
index 0000000000..4b7b9f2d98
--- /dev/null
+++ b/src/grp-coredump/systemd-coredump/coredump-vacuum.h
@@ -0,0 +1,25 @@
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 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 <inttypes.h>
+#include <sys/types.h>
+
+int coredump_vacuum(int exclude_fd, uint64_t keep_free, uint64_t max_use);
diff --git a/src/grp-coredump/systemd-coredump/coredump.c b/src/grp-coredump/systemd-coredump/coredump.c
new file mode 100644
index 0000000000..bf0e0a038b
--- /dev/null
+++ b/src/grp-coredump/systemd-coredump/coredump.c
@@ -0,0 +1,1149 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/prctl.h>
+#include <sys/xattr.h>
+#include <unistd.h>
+
+#ifdef HAVE_ELFUTILS
+#include <dwarf.h>
+#include <elfutils/libdwfl.h>
+#endif
+
+#include <systemd/sd-journal.h>
+#include <systemd/sd-login.h>
+#include <systemd/sd-daemon.h>
+
+#include "acl-util.h"
+#include "alloc-util.h"
+#include "capability-util.h"
+#include "cgroup-util.h"
+#include "compress.h"
+#include "conf-parser.h"
+#include "copy.h"
+#include "coredump-vacuum.h"
+#include "dirent-util.h"
+#include "escape.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "io-util.h"
+#include "journald-native.h"
+#include "log.h"
+#include "macro.h"
+#include "missing.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "socket-util.h"
+#include "special.h"
+#include "stacktrace.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "strv.h"
+#include "user-util.h"
+#include "util.h"
+
+/* The maximum size up to which we process coredumps */
+#define PROCESS_SIZE_MAX ((uint64_t) (2LLU*1024LLU*1024LLU*1024LLU))
+
+/* The maximum size up to which we leave the coredump around on disk */
+#define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX
+
+/* The maximum size up to which we store the coredump in the journal */
+#define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU))
+
+/* Make sure to not make this larger than the maximum journal entry
+ * size. See DATA_SIZE_MAX in journald-native.c. */
+assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX);
+
+enum {
+ /* We use this as array indexes for a couple of special fields we use for naming coredumping files, and
+ * attaching xattrs */
+ CONTEXT_PID,
+ CONTEXT_UID,
+ CONTEXT_GID,
+ CONTEXT_SIGNAL,
+ CONTEXT_TIMESTAMP,
+ CONTEXT_RLIMIT,
+ CONTEXT_COMM,
+ CONTEXT_EXE,
+ _CONTEXT_MAX
+};
+
+typedef enum CoredumpStorage {
+ COREDUMP_STORAGE_NONE,
+ COREDUMP_STORAGE_EXTERNAL,
+ COREDUMP_STORAGE_JOURNAL,
+ COREDUMP_STORAGE_BOTH,
+ _COREDUMP_STORAGE_MAX,
+ _COREDUMP_STORAGE_INVALID = -1
+} CoredumpStorage;
+
+static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = {
+ [COREDUMP_STORAGE_NONE] = "none",
+ [COREDUMP_STORAGE_EXTERNAL] = "external",
+ [COREDUMP_STORAGE_JOURNAL] = "journal",
+ [COREDUMP_STORAGE_BOTH] = "both",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage);
+static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting");
+
+static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL;
+static bool arg_compress = true;
+static uint64_t arg_process_size_max = PROCESS_SIZE_MAX;
+static uint64_t arg_external_size_max = EXTERNAL_SIZE_MAX;
+static size_t arg_journal_size_max = JOURNAL_SIZE_MAX;
+static uint64_t arg_keep_free = (uint64_t) -1;
+static uint64_t arg_max_use = (uint64_t) -1;
+
+static int parse_config(void) {
+ static const ConfigTableItem items[] = {
+ { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage },
+ { "Coredump", "Compress", config_parse_bool, 0, &arg_compress },
+ { "Coredump", "ProcessSizeMax", config_parse_iec_uint64, 0, &arg_process_size_max },
+ { "Coredump", "ExternalSizeMax", config_parse_iec_uint64, 0, &arg_external_size_max },
+ { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max },
+ { "Coredump", "KeepFree", config_parse_iec_uint64, 0, &arg_keep_free },
+ { "Coredump", "MaxUse", config_parse_iec_uint64, 0, &arg_max_use },
+ {}
+ };
+
+ return config_parse_many(PKGSYSCONFDIR "/coredump.conf",
+ CONF_PATHS_NULSTR("systemd/coredump.conf.d"),
+ "Coredump\0",
+ config_item_table_lookup, items,
+ false, NULL);
+}
+
+static int fix_acl(int fd, uid_t uid) {
+
+#ifdef HAVE_ACL
+ _cleanup_(acl_freep) acl_t acl = NULL;
+ acl_entry_t entry;
+ acl_permset_t permset;
+ int r;
+
+ assert(fd >= 0);
+
+ if (uid <= SYSTEM_UID_MAX)
+ return 0;
+
+ /* Make sure normal users can read (but not write or delete)
+ * their own coredumps */
+
+ acl = acl_get_fd(fd);
+ if (!acl)
+ return log_error_errno(errno, "Failed to get ACL: %m");
+
+ if (acl_create_entry(&acl, &entry) < 0 ||
+ acl_set_tag_type(entry, ACL_USER) < 0 ||
+ acl_set_qualifier(entry, &uid) < 0) {
+ 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)
+ return log_warning_errno(errno, "Failed to patch ACL: %m");
+
+ r = calc_acl_mask_if_needed(&acl);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to patch ACL: %m");
+
+ if (acl_set_fd(fd, acl) < 0)
+ return log_error_errno(errno, "Failed to apply ACL: %m");
+#endif
+
+ return 0;
+}
+
+static int fix_xattr(int fd, const char *context[_CONTEXT_MAX]) {
+
+ static const char * const xattrs[_CONTEXT_MAX] = {
+ [CONTEXT_PID] = "user.coredump.pid",
+ [CONTEXT_UID] = "user.coredump.uid",
+ [CONTEXT_GID] = "user.coredump.gid",
+ [CONTEXT_SIGNAL] = "user.coredump.signal",
+ [CONTEXT_TIMESTAMP] = "user.coredump.timestamp",
+ [CONTEXT_COMM] = "user.coredump.comm",
+ [CONTEXT_EXE] = "user.coredump.exe",
+ };
+
+ int r = 0;
+ unsigned i;
+
+ assert(fd >= 0);
+
+ /* Attach some metadata to coredumps via extended
+ * attributes. Just because we can. */
+
+ for (i = 0; i < _CONTEXT_MAX; i++) {
+ int k;
+
+ if (isempty(context[i]) || !xattrs[i])
+ continue;
+
+ k = fsetxattr(fd, xattrs[i], context[i], strlen(context[i]), XATTR_CREATE);
+ if (k < 0 && r == 0)
+ r = -errno;
+ }
+
+ return r;
+}
+
+#define filename_escape(s) xescape((s), "./ ")
+
+static inline const char *coredump_tmpfile_name(const char *s) {
+ return s ? s : "(unnamed temporary file)";
+}
+
+static int fix_permissions(
+ int fd,
+ const char *filename,
+ const char *target,
+ const char *context[_CONTEXT_MAX],
+ uid_t uid) {
+
+ int r;
+
+ assert(fd >= 0);
+ assert(target);
+ assert(context);
+
+ /* Ignore errors on these */
+ (void) fchmod(fd, 0640);
+ (void) fix_acl(fd, uid);
+ (void) fix_xattr(fd, context);
+
+ if (fsync(fd) < 0)
+ return log_error_errno(errno, "Failed to sync coredump %s: %m", coredump_tmpfile_name(filename));
+
+ r = link_tmpfile(fd, filename, target);
+ if (r < 0)
+ return log_error_errno(r, "Failed to move coredump %s into place: %m", target);
+
+ return 0;
+}
+
+static int maybe_remove_external_coredump(const char *filename, uint64_t size) {
+
+ /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */
+
+ if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) &&
+ size <= arg_external_size_max)
+ return 0;
+
+ if (!filename)
+ return 1;
+
+ if (unlink(filename) < 0 && errno != ENOENT)
+ return log_error_errno(errno, "Failed to unlink %s: %m", filename);
+
+ return 1;
+}
+
+static int make_filename(const char *context[_CONTEXT_MAX], char **ret) {
+ _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL;
+ sd_id128_t boot = {};
+ int r;
+
+ assert(context);
+
+ c = filename_escape(context[CONTEXT_COMM]);
+ if (!c)
+ return -ENOMEM;
+
+ u = filename_escape(context[CONTEXT_UID]);
+ if (!u)
+ return -ENOMEM;
+
+ r = sd_id128_get_boot(&boot);
+ if (r < 0)
+ return r;
+
+ p = filename_escape(context[CONTEXT_PID]);
+ if (!p)
+ return -ENOMEM;
+
+ t = filename_escape(context[CONTEXT_TIMESTAMP]);
+ if (!t)
+ return -ENOMEM;
+
+ if (asprintf(ret,
+ "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000",
+ c,
+ u,
+ SD_ID128_FORMAT_VAL(boot),
+ p,
+ t) < 0)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int save_external_coredump(
+ const char *context[_CONTEXT_MAX],
+ int input_fd,
+ char **ret_filename,
+ int *ret_node_fd,
+ int *ret_data_fd,
+ uint64_t *ret_size) {
+
+ _cleanup_free_ char *fn = NULL, *tmp = NULL;
+ _cleanup_close_ int fd = -1;
+ uint64_t rlimit, max_size;
+ struct stat st;
+ uid_t uid;
+ int r;
+
+ assert(context);
+ assert(ret_filename);
+ assert(ret_node_fd);
+ assert(ret_data_fd);
+ assert(ret_size);
+
+ r = parse_uid(context[CONTEXT_UID], &uid);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse UID: %m");
+
+ r = safe_atou64(context[CONTEXT_RLIMIT], &rlimit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse resource limit: %s", context[CONTEXT_RLIMIT]);
+ if (rlimit <= 0) {
+ /* Is coredumping disabled? Then don't bother saving/processing the coredump */
+ log_info("Core Dumping has been disabled for process %s (%s).", context[CONTEXT_PID], context[CONTEXT_COMM]);
+ return -EBADSLT;
+ }
+
+ /* Never store more than the process configured, or than we actually shall keep or process */
+ max_size = MIN(rlimit, MAX(arg_process_size_max, arg_external_size_max));
+
+ r = make_filename(context, &fn);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine coredump file name: %m");
+
+ mkdir_p_label("/var/lib/systemd/coredump", 0755);
+
+ fd = open_tmpfile_linkable(fn, O_RDWR|O_CLOEXEC, &tmp);
+ if (fd < 0)
+ return log_error_errno(fd, "Failed to create temporary file for coredump %s: %m", fn);
+
+ r = copy_bytes(input_fd, fd, max_size, false);
+ if (r == -EFBIG) {
+ log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", context[CONTEXT_PID], context[CONTEXT_COMM]);
+ goto fail;
+ } else if (IN_SET(r, -EDQUOT, -ENOSPC)) {
+ log_error("Not enough disk space for coredump of %s (%s), refusing.", context[CONTEXT_PID], context[CONTEXT_COMM]);
+ goto fail;
+ } else if (r < 0) {
+ log_error_errno(r, "Failed to dump coredump to file: %m");
+ goto fail;
+ }
+
+ if (fstat(fd, &st) < 0) {
+ log_error_errno(errno, "Failed to fstat coredump %s: %m", coredump_tmpfile_name(tmp));
+ goto fail;
+ }
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1) {
+ log_error_errno(errno, "Failed to seek on %s: %m", coredump_tmpfile_name(tmp));
+ goto fail;
+ }
+
+#if defined(HAVE_XZ) || defined(HAVE_LZ4)
+ /* If we will remove the coredump anyway, do not compress. */
+ if (maybe_remove_external_coredump(NULL, st.st_size) == 0
+ && arg_compress) {
+
+ _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL;
+ _cleanup_close_ int fd_compressed = -1;
+
+ fn_compressed = strappend(fn, COMPRESSED_EXT);
+ if (!fn_compressed) {
+ log_oom();
+ goto uncompressed;
+ }
+
+ fd_compressed = open_tmpfile_linkable(fn_compressed, O_RDWR|O_CLOEXEC, &tmp_compressed);
+ if (fd_compressed < 0) {
+ log_error_errno(fd_compressed, "Failed to create temporary file for coredump %s: %m", fn_compressed);
+ goto uncompressed;
+ }
+
+ r = compress_stream(fd, fd_compressed, -1);
+ if (r < 0) {
+ log_error_errno(r, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed));
+ goto fail_compressed;
+ }
+
+ r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, context, uid);
+ if (r < 0)
+ goto fail_compressed;
+
+ /* OK, this worked, we can get rid of the uncompressed version now */
+ if (tmp)
+ unlink_noerrno(tmp);
+
+ *ret_filename = fn_compressed; /* compressed */
+ *ret_node_fd = fd_compressed; /* compressed */
+ *ret_data_fd = fd; /* uncompressed */
+ *ret_size = (uint64_t) st.st_size; /* uncompressed */
+
+ fn_compressed = NULL;
+ fd = fd_compressed = -1;
+
+ return 0;
+
+ fail_compressed:
+ if (tmp_compressed)
+ (void) unlink(tmp_compressed);
+ }
+
+uncompressed:
+#endif
+
+ r = fix_permissions(fd, tmp, fn, context, uid);
+ if (r < 0)
+ goto fail;
+
+ *ret_filename = fn;
+ *ret_data_fd = fd;
+ *ret_node_fd = -1;
+ *ret_size = (uint64_t) st.st_size;
+
+ fn = NULL;
+ fd = -1;
+
+ return 0;
+
+fail:
+ if (tmp)
+ (void) unlink(tmp);
+ return r;
+}
+
+static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) {
+ _cleanup_free_ char *field = NULL;
+ ssize_t n;
+
+ assert(fd >= 0);
+ assert(ret);
+ assert(ret_size);
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
+ return log_warning_errno(errno, "Failed to seek: %m");
+
+ field = malloc(9 + size);
+ if (!field) {
+ log_warning("Failed to allocate memory for coredump, coredump will not be stored.");
+ return -ENOMEM;
+ }
+
+ memcpy(field, "COREDUMP=", 9);
+
+ n = read(fd, field + 9, size);
+ if (n < 0)
+ return log_error_errno((int) n, "Failed to read core data: %m");
+ if ((size_t) n < size) {
+ log_error("Core data too short.");
+ return -EIO;
+ }
+
+ *ret = field;
+ *ret_size = size + 9;
+
+ field = NULL;
+
+ return 0;
+}
+
+/* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines:
+ * 0:/dev/pts/23
+ * pos: 0
+ * flags: 0100002
+ *
+ * 1:/dev/pts/23
+ * pos: 0
+ * flags: 0100002
+ *
+ * 2:/dev/pts/23
+ * pos: 0
+ * flags: 0100002
+ * EOF
+ */
+static int compose_open_fds(pid_t pid, char **open_fds) {
+ _cleanup_closedir_ DIR *proc_fd_dir = NULL;
+ _cleanup_close_ int proc_fdinfo_fd = -1;
+ _cleanup_free_ char *buffer = NULL;
+ _cleanup_fclose_ FILE *stream = NULL;
+ const char *fddelim = "", *path;
+ struct dirent *dent = NULL;
+ size_t size = 0;
+ int r = 0;
+
+ assert(pid >= 0);
+ assert(open_fds != NULL);
+
+ path = procfs_file_alloca(pid, "fd");
+ proc_fd_dir = opendir(path);
+ if (!proc_fd_dir)
+ return -errno;
+
+ proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH);
+ if (proc_fdinfo_fd < 0)
+ return -errno;
+
+ stream = open_memstream(&buffer, &size);
+ if (!stream)
+ return -ENOMEM;
+
+ FOREACH_DIRENT(dent, proc_fd_dir, return -errno) {
+ _cleanup_fclose_ FILE *fdinfo = NULL;
+ _cleanup_free_ char *fdname = NULL;
+ char line[LINE_MAX];
+ int fd;
+
+ r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname);
+ if (r < 0)
+ return r;
+
+ fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname);
+ fddelim = "\n";
+
+ /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */
+ fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY);
+ if (fd < 0)
+ continue;
+
+ fdinfo = fdopen(fd, "re");
+ if (fdinfo == NULL) {
+ close(fd);
+ continue;
+ }
+
+ FOREACH_LINE(line, fdinfo, break) {
+ fputs(line, stream);
+ if (!endswith(line, "\n"))
+ fputc('\n', stream);
+ }
+ }
+
+ errno = 0;
+ stream = safe_fclose(stream);
+
+ if (errno > 0)
+ return -errno;
+
+ *open_fds = buffer;
+ buffer = NULL;
+
+ return 0;
+}
+
+static int change_uid_gid(const char *context[]) {
+ uid_t uid;
+ gid_t gid;
+ int r;
+
+ r = parse_uid(context[CONTEXT_UID], &uid);
+ if (r < 0)
+ return r;
+
+ if (uid <= SYSTEM_UID_MAX) {
+ const char *user = "systemd-coredump";
+
+ r = get_user_creds(&user, &uid, &gid, NULL, NULL);
+ if (r < 0) {
+ log_warning_errno(r, "Cannot resolve %s user. Proceeding to dump core as root: %m", user);
+ uid = gid = 0;
+ }
+ } else {
+ r = parse_gid(context[CONTEXT_GID], &gid);
+ if (r < 0)
+ return r;
+ }
+
+ return drop_privileges(uid, gid, 0);
+}
+
+static int submit_coredump(
+ const char *context[_CONTEXT_MAX],
+ struct iovec *iovec,
+ size_t n_iovec_allocated,
+ size_t n_iovec,
+ int input_fd) {
+
+ _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1;
+ _cleanup_free_ char *core_message = NULL, *filename = NULL, *coredump_data = NULL;
+ uint64_t coredump_size;
+ int r;
+
+ assert(context);
+ assert(iovec);
+ assert(n_iovec_allocated >= n_iovec + 3);
+ assert(input_fd >= 0);
+
+ /* Vacuum before we write anything again */
+ (void) coredump_vacuum(-1, arg_keep_free, arg_max_use);
+
+ /* Always stream the coredump to disk, if that's possible */
+ r = save_external_coredump(context, input_fd, &filename, &coredump_node_fd, &coredump_fd, &coredump_size);
+ if (r < 0)
+ /* Skip whole core dumping part */
+ goto log;
+
+ /* If we don't want to keep the coredump on disk, remove it now, as later on we will lack the privileges for
+ * it. However, we keep the fd to it, so that we can still process it and log it. */
+ r = maybe_remove_external_coredump(filename, coredump_size);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ const char *coredump_filename;
+
+ coredump_filename = strjoina("COREDUMP_FILENAME=", filename);
+ IOVEC_SET_STRING(iovec[n_iovec++], coredump_filename);
+ }
+
+ /* Vacuum again, but exclude the coredump we just created */
+ (void) coredump_vacuum(coredump_node_fd >= 0 ? coredump_node_fd : coredump_fd, arg_keep_free, arg_max_use);
+
+ /* Now, let's drop privileges to become the user who owns the segfaulted process and allocate the coredump
+ * memory under the user's uid. This also ensures that the credentials journald will see are the ones of the
+ * coredumping user, thus making sure the user gets access to the core dump. Let's also get rid of all
+ * capabilities, if we run as root, we won't need them anymore. */
+ r = change_uid_gid(context);
+ if (r < 0)
+ return log_error_errno(r, "Failed to drop privileges: %m");
+
+#ifdef HAVE_ELFUTILS
+ /* Try to get a strack trace if we can */
+ if (coredump_size <= arg_process_size_max) {
+ _cleanup_free_ char *stacktrace = NULL;
+
+ r = coredump_make_stack_trace(coredump_fd, context[CONTEXT_EXE], &stacktrace);
+ if (r >= 0)
+ core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], " (", context[CONTEXT_COMM], ") of user ", context[CONTEXT_UID], " dumped core.\n\n", stacktrace, NULL);
+ else if (r == -EINVAL)
+ log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno()));
+ else
+ log_warning_errno(r, "Failed to generate stack trace: %m");
+ }
+
+ if (!core_message)
+#endif
+log:
+ core_message = strjoin("MESSAGE=Process ", context[CONTEXT_PID], " (", context[CONTEXT_COMM], ") of user ", context[CONTEXT_UID], " dumped core.", NULL);
+ if (core_message)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_message);
+
+ /* Optionally store the entire coredump in the journal */
+ if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) &&
+ coredump_size <= arg_journal_size_max) {
+ size_t sz = 0;
+
+ /* Store the coredump itself in the journal */
+
+ r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz);
+ if (r >= 0) {
+ iovec[n_iovec].iov_base = coredump_data;
+ iovec[n_iovec].iov_len = sz;
+ n_iovec++;
+ }
+ }
+
+ assert(n_iovec <= n_iovec_allocated);
+
+ r = sd_journal_sendv(iovec, n_iovec);
+ if (r < 0)
+ return log_error_errno(r, "Failed to log coredump: %m");
+
+ return 0;
+}
+
+static void map_context_fields(const struct iovec *iovec, const char *context[]) {
+
+ static const char * const context_field_names[_CONTEXT_MAX] = {
+ [CONTEXT_PID] = "COREDUMP_PID=",
+ [CONTEXT_UID] = "COREDUMP_UID=",
+ [CONTEXT_GID] = "COREDUMP_GID=",
+ [CONTEXT_SIGNAL] = "COREDUMP_SIGNAL=",
+ [CONTEXT_TIMESTAMP] = "COREDUMP_TIMESTAMP=",
+ [CONTEXT_COMM] = "COREDUMP_COMM=",
+ [CONTEXT_EXE] = "COREDUMP_EXE=",
+ [CONTEXT_RLIMIT] = "COREDUMP_RLIMIT=",
+ };
+
+ unsigned i;
+
+ assert(iovec);
+ assert(context);
+
+ for (i = 0; i < _CONTEXT_MAX; i++) {
+ size_t l;
+
+ l = strlen(context_field_names[i]);
+ if (iovec->iov_len < l)
+ continue;
+
+ if (memcmp(iovec->iov_base, context_field_names[i], l) != 0)
+ continue;
+
+ /* Note that these strings are NUL terminated, because we made sure that a trailing NUL byte is in the
+ * buffer, though not included in the iov_len count. (see below) */
+ context[i] = (char*) iovec->iov_base + l;
+ break;
+ }
+}
+
+static int process_socket(int fd) {
+ _cleanup_close_ int coredump_fd = -1;
+ struct iovec *iovec = NULL;
+ size_t n_iovec = 0, n_iovec_allocated = 0, i;
+ const char *context[_CONTEXT_MAX] = {};
+ int r;
+
+ assert(fd >= 0);
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ for (;;) {
+ union {
+ struct cmsghdr cmsghdr;
+ uint8_t buf[CMSG_SPACE(sizeof(int))];
+ } control = {};
+ struct msghdr mh = {
+ .msg_control = &control,
+ .msg_controllen = sizeof(control),
+ .msg_iovlen = 1,
+ };
+ ssize_t n;
+ ssize_t l;
+
+ if (!GREEDY_REALLOC(iovec, n_iovec_allocated, n_iovec + 3)) {
+ r = log_oom();
+ goto finish;
+ }
+
+ l = next_datagram_size_fd(fd);
+ if (l < 0) {
+ r = log_error_errno(l, "Failed to determine datagram size to read: %m");
+ goto finish;
+ }
+
+ assert(l >= 0);
+
+ iovec[n_iovec].iov_len = l;
+ iovec[n_iovec].iov_base = malloc(l + 1);
+
+ if (!iovec[n_iovec].iov_base) {
+ r = log_oom();
+ goto finish;
+ }
+
+ mh.msg_iov = iovec + n_iovec;
+
+ n = recvmsg(fd, &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC);
+ if (n < 0) {
+ free(iovec[n_iovec].iov_base);
+ r = log_error_errno(errno, "Failed to receive datagram: %m");
+ goto finish;
+ }
+
+ if (n == 0) {
+ struct cmsghdr *cmsg, *found = NULL;
+ /* The final zero-length datagram carries the file descriptor and tells us that we're done. */
+
+ free(iovec[n_iovec].iov_base);
+
+ CMSG_FOREACH(cmsg, &mh) {
+ if (cmsg->cmsg_level == SOL_SOCKET &&
+ cmsg->cmsg_type == SCM_RIGHTS &&
+ cmsg->cmsg_len == CMSG_LEN(sizeof(int))) {
+ assert(!found);
+ found = cmsg;
+ }
+ }
+
+ if (!found) {
+ log_error("Coredump file descriptor missing.");
+ r = -EBADMSG;
+ goto finish;
+ }
+
+ assert(coredump_fd < 0);
+ coredump_fd = *(int*) CMSG_DATA(found);
+ break;
+ }
+
+ /* Add trailing NUL byte, in case these are strings */
+ ((char*) iovec[n_iovec].iov_base)[n] = 0;
+ iovec[n_iovec].iov_len = (size_t) n;
+
+ cmsg_close_all(&mh);
+ map_context_fields(iovec + n_iovec, context);
+ n_iovec++;
+ }
+
+ if (!GREEDY_REALLOC(iovec, n_iovec_allocated, n_iovec + 3)) {
+ r = log_oom();
+ goto finish;
+ }
+
+ /* Make sure we we got all data we really need */
+ assert(context[CONTEXT_PID]);
+ assert(context[CONTEXT_UID]);
+ assert(context[CONTEXT_GID]);
+ assert(context[CONTEXT_SIGNAL]);
+ assert(context[CONTEXT_TIMESTAMP]);
+ assert(context[CONTEXT_RLIMIT]);
+ assert(context[CONTEXT_COMM]);
+ assert(coredump_fd >= 0);
+
+ r = submit_coredump(context, iovec, n_iovec_allocated, n_iovec, coredump_fd);
+
+finish:
+ for (i = 0; i < n_iovec; i++)
+ free(iovec[i].iov_base);
+ free(iovec);
+
+ return r;
+}
+
+static int send_iovec(const struct iovec iovec[], size_t n_iovec, int input_fd) {
+
+ static const union sockaddr_union sa = {
+ .un.sun_family = AF_UNIX,
+ .un.sun_path = "/run/systemd/coredump",
+ };
+ _cleanup_close_ int fd = -1;
+ size_t i;
+ int r;
+
+ assert(iovec || n_iovec <= 0);
+ assert(input_fd >= 0);
+
+ fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to create coredump socket: %m");
+
+ if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
+ return log_error_errno(errno, "Failed to connect to coredump service: %m");
+
+ for (i = 0; i < n_iovec; i++) {
+ ssize_t n;
+ assert(iovec[i].iov_len > 0);
+
+ n = send(fd, iovec[i].iov_base, iovec[i].iov_len, MSG_NOSIGNAL);
+ if (n < 0)
+ return log_error_errno(errno, "Failed to send coredump datagram: %m");
+ }
+
+ r = send_one_fd(fd, input_fd, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to send coredump fd: %m");
+
+ return 0;
+}
+
+static int process_journald_crash(const char *context[], int input_fd) {
+ _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1;
+ _cleanup_free_ char *filename = NULL;
+ uint64_t coredump_size;
+ int r;
+
+ assert(context);
+ assert(input_fd >= 0);
+
+ /* If we are journald, we cut things short, don't write to the journal, but still create a coredump. */
+
+ if (arg_storage != COREDUMP_STORAGE_NONE)
+ arg_storage = COREDUMP_STORAGE_EXTERNAL;
+
+ r = save_external_coredump(context, input_fd, &filename, &coredump_node_fd, &coredump_fd, &coredump_size);
+ if (r < 0)
+ return r;
+
+ r = maybe_remove_external_coredump(filename, coredump_size);
+ if (r < 0)
+ return r;
+
+ log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename);
+ return 0;
+}
+
+static int process_kernel(int argc, char* argv[]) {
+
+ /* The small core field we allocate on the stack, to keep things simple */
+ char
+ *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
+ *core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL,
+ *core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL,
+ *core_user_unit = NULL, *core_slice = NULL, *core_timestamp = NULL, *core_rlimit = NULL;
+
+ /* The larger ones we allocate on the heap */
+ _cleanup_free_ char
+ *core_owner_uid = NULL, *core_open_fds = NULL, *core_proc_status = NULL,
+ *core_proc_maps = NULL, *core_proc_limits = NULL, *core_proc_cgroup = NULL, *core_environ = NULL;
+
+ _cleanup_free_ char *exe = NULL, *comm = NULL;
+ const char *context[_CONTEXT_MAX];
+ struct iovec iovec[25];
+ size_t n_iovec = 0;
+ uid_t owner_uid;
+ const char *p;
+ pid_t pid;
+ char *t;
+ int r;
+
+ if (argc < CONTEXT_COMM + 1) {
+ log_error("Not enough arguments passed from kernel (%i, expected %i).", argc - 1, CONTEXT_COMM + 1 - 1);
+ return -EINVAL;
+ }
+
+ r = parse_pid(argv[CONTEXT_PID + 1], &pid);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse PID.");
+
+ r = get_process_comm(pid, &comm);
+ if (r < 0) {
+ log_warning_errno(r, "Failed to get COMM, falling back to the command line: %m");
+ comm = strv_join(argv + CONTEXT_COMM + 1, " ");
+ if (!comm)
+ return log_oom();
+ }
+
+ r = get_process_exe(pid, &exe);
+ if (r < 0)
+ log_warning_errno(r, "Failed to get EXE, ignoring: %m");
+
+ context[CONTEXT_PID] = argv[CONTEXT_PID + 1];
+ context[CONTEXT_UID] = argv[CONTEXT_UID + 1];
+ context[CONTEXT_GID] = argv[CONTEXT_GID + 1];
+ context[CONTEXT_SIGNAL] = argv[CONTEXT_SIGNAL + 1];
+ context[CONTEXT_TIMESTAMP] = argv[CONTEXT_TIMESTAMP + 1];
+ context[CONTEXT_RLIMIT] = argv[CONTEXT_RLIMIT + 1];
+ context[CONTEXT_COMM] = comm;
+ context[CONTEXT_EXE] = exe;
+
+ if (cg_pid_get_unit(pid, &t) >= 0) {
+
+ if (streq(t, SPECIAL_JOURNALD_SERVICE)) {
+ free(t);
+ return process_journald_crash(context, STDIN_FILENO);
+ }
+
+ core_unit = strjoina("COREDUMP_UNIT=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_unit);
+ }
+
+ /* OK, now we know it's not the journal, hence we can make use of it now. */
+ log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
+ log_open();
+
+ if (cg_pid_get_user_unit(pid, &t) >= 0) {
+ core_user_unit = strjoina("COREDUMP_USER_UNIT=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_user_unit);
+ }
+
+ core_pid = strjoina("COREDUMP_PID=", context[CONTEXT_PID]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_pid);
+
+ core_uid = strjoina("COREDUMP_UID=", context[CONTEXT_UID]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_uid);
+
+ core_gid = strjoina("COREDUMP_GID=", context[CONTEXT_GID]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_gid);
+
+ core_signal = strjoina("COREDUMP_SIGNAL=", context[CONTEXT_SIGNAL]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_signal);
+
+ core_rlimit = strjoina("COREDUMP_RLIMIT=", context[CONTEXT_RLIMIT]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_rlimit);
+
+ if (sd_pid_get_session(pid, &t) >= 0) {
+ core_session = strjoina("COREDUMP_SESSION=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_session);
+ }
+
+ if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) {
+ r = asprintf(&core_owner_uid, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid);
+ if (r > 0)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_owner_uid);
+ }
+
+ if (sd_pid_get_slice(pid, &t) >= 0) {
+ core_slice = strjoina("COREDUMP_SLICE=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_slice);
+ }
+
+ if (comm) {
+ core_comm = strjoina("COREDUMP_COMM=", comm);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_comm);
+ }
+
+ if (exe) {
+ core_exe = strjoina("COREDUMP_EXE=", exe);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_exe);
+ }
+
+ if (get_process_cmdline(pid, 0, false, &t) >= 0) {
+ core_cmdline = strjoina("COREDUMP_CMDLINE=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_cmdline);
+ }
+
+ if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) {
+ core_cgroup = strjoina("COREDUMP_CGROUP=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_cgroup);
+ }
+
+ if (compose_open_fds(pid, &t) >= 0) {
+ core_open_fds = strappend("COREDUMP_OPEN_FDS=", t);
+ free(t);
+
+ if (core_open_fds)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_open_fds);
+ }
+
+ p = procfs_file_alloca(pid, "status");
+ if (read_full_file(p, &t, NULL) >= 0) {
+ core_proc_status = strappend("COREDUMP_PROC_STATUS=", t);
+ free(t);
+
+ if (core_proc_status)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_proc_status);
+ }
+
+ p = procfs_file_alloca(pid, "maps");
+ if (read_full_file(p, &t, NULL) >= 0) {
+ core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t);
+ free(t);
+
+ if (core_proc_maps)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_proc_maps);
+ }
+
+ p = procfs_file_alloca(pid, "limits");
+ if (read_full_file(p, &t, NULL) >= 0) {
+ core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t);
+ free(t);
+
+ if (core_proc_limits)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_proc_limits);
+ }
+
+ p = procfs_file_alloca(pid, "cgroup");
+ if (read_full_file(p, &t, NULL) >=0) {
+ core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t);
+ free(t);
+
+ if (core_proc_cgroup)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_proc_cgroup);
+ }
+
+ if (get_process_cwd(pid, &t) >= 0) {
+ core_cwd = strjoina("COREDUMP_CWD=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_cwd);
+ }
+
+ if (get_process_root(pid, &t) >= 0) {
+ core_root = strjoina("COREDUMP_ROOT=", t);
+ free(t);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], core_root);
+ }
+
+ if (get_process_environ(pid, &t) >= 0) {
+ core_environ = strappend("COREDUMP_ENVIRON=", t);
+ free(t);
+
+ if (core_environ)
+ IOVEC_SET_STRING(iovec[n_iovec++], core_environ);
+ }
+
+ core_timestamp = strjoina("COREDUMP_TIMESTAMP=", context[CONTEXT_TIMESTAMP], "000000");
+ IOVEC_SET_STRING(iovec[n_iovec++], core_timestamp);
+
+ IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
+
+ assert_cc(2 == LOG_CRIT);
+ IOVEC_SET_STRING(iovec[n_iovec++], "PRIORITY=2");
+
+ assert(n_iovec <= ELEMENTSOF(iovec));
+
+ return send_iovec(iovec, n_iovec, STDIN_FILENO);
+}
+
+int main(int argc, char *argv[]) {
+ int r;
+
+ /* First, log to a safe place, since we don't know what crashed and it might be journald which we'd rather not
+ * log to then. */
+
+ log_set_target(LOG_TARGET_KMSG);
+ log_open();
+
+ /* Make sure we never enter a loop */
+ (void) prctl(PR_SET_DUMPABLE, 0);
+
+ /* Ignore all parse errors */
+ (void) parse_config();
+
+ log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage));
+ log_debug("Selected compression %s.", yes_no(arg_compress));
+
+ r = sd_listen_fds(false);
+ if (r < 0) {
+ log_error_errno(r, "Failed to determine number of file descriptor: %m");
+ goto finish;
+ }
+
+ /* If we got an fd passed, we are running in coredumpd mode. Otherwise we are invoked from the kernel as
+ * coredump handler */
+ if (r == 0)
+ r = process_kernel(argc, argv);
+ else if (r == 1)
+ r = process_socket(SD_LISTEN_FDS_START);
+ else {
+ log_error("Received unexpected number of file descriptors.");
+ r = -EINVAL;
+ }
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
diff --git a/src/grp-coredump/systemd-coredump/coredump.conf b/src/grp-coredump/systemd-coredump/coredump.conf
new file mode 100644
index 0000000000..c2f0643e03
--- /dev/null
+++ b/src/grp-coredump/systemd-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/grp-coredump/systemd-coredump/stacktrace.c b/src/grp-coredump/systemd-coredump/stacktrace.c
new file mode 100644
index 0000000000..cc4dad9465
--- /dev/null
+++ b/src/grp-coredump/systemd-coredump/stacktrace.c
@@ -0,0 +1,200 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2014 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 <dwarf.h>
+#include <elfutils/libdwfl.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "formats-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;
+
+ 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 = buf;
+ buf = NULL;
+
+ 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/grp-coredump/systemd-coredump/stacktrace.h b/src/grp-coredump/systemd-coredump/stacktrace.h
new file mode 100644
index 0000000000..15e9c04465
--- /dev/null
+++ b/src/grp-coredump/systemd-coredump/stacktrace.h
@@ -0,0 +1,22 @@
+#pragma once
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 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/>.
+***/
+
+int coredump_make_stack_trace(int fd, const char *executable, char **ret);
diff --git a/src/grp-coredump/systemd-coredump/test-coredump-vacuum.c b/src/grp-coredump/systemd-coredump/test-coredump-vacuum.c
new file mode 100644
index 0000000000..70a57f183f
--- /dev/null
+++ b/src/grp-coredump/systemd-coredump/test-coredump-vacuum.c
@@ -0,0 +1,30 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Zbigniew Jędrzejewski-Szmek
+
+ 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 <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;
+}