#include <unistd.h>
#ifdef HAVE_ELFUTILS
-# include <dwarf.h>
-# include <elfutils/libdwfl.h>
+#include <dwarf.h>
+#include <elfutils/libdwfl.h>
#endif
#include "sd-journal.h"
#include "sd-login.h"
+#include "sd-daemon.h"
#include "acl-util.h"
#include "alloc-util.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"
assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX);
enum {
- INFO_PID,
- INFO_UID,
- INFO_GID,
- INFO_SIGNAL,
- INFO_TIMESTAMP,
- INFO_COMM,
- INFO_EXE,
- _INFO_LEN
+ /* 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_COMM,
+ CONTEXT_EXE,
+ _CONTEXT_MAX
};
typedef enum CoredumpStorage {
return 0;
}
-static int fix_xattr(int fd, const char *info[_INFO_LEN]) {
+static int fix_xattr(int fd, const char *context[_CONTEXT_MAX]) {
- static const char * const xattrs[_INFO_LEN] = {
- [INFO_PID] = "user.coredump.pid",
- [INFO_UID] = "user.coredump.uid",
- [INFO_GID] = "user.coredump.gid",
- [INFO_SIGNAL] = "user.coredump.signal",
- [INFO_TIMESTAMP] = "user.coredump.timestamp",
- [INFO_COMM] = "user.coredump.comm",
- [INFO_EXE] = "user.coredump.exe",
+ 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;
/* Attach some metadata to coredumps via extended
* attributes. Just because we can. */
- for (i = 0; i < _INFO_LEN; i++) {
+ for (i = 0; i < _CONTEXT_MAX; i++) {
int k;
- if (isempty(info[i]) || !xattrs[i])
+ if (isempty(context[i]) || !xattrs[i])
continue;
- k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE);
+ k = fsetxattr(fd, xattrs[i], context[i], strlen(context[i]), XATTR_CREATE);
if (k < 0 && r == 0)
r = -errno;
}
int fd,
const char *filename,
const char *target,
- const char *info[_INFO_LEN],
+ const char *context[_CONTEXT_MAX],
uid_t uid) {
assert(fd >= 0);
assert(filename);
assert(target);
- assert(info);
+ assert(context);
/* Ignore errors on these */
- fchmod(fd, 0640);
- fix_acl(fd, uid);
- fix_xattr(fd, info);
+ (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", filename);
return 1;
}
-static int make_filename(const char *info[_INFO_LEN], char **ret) {
+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(info);
+ assert(context);
- c = filename_escape(info[INFO_COMM]);
+ c = filename_escape(context[CONTEXT_COMM]);
if (!c)
return -ENOMEM;
- u = filename_escape(info[INFO_UID]);
+ u = filename_escape(context[CONTEXT_UID]);
if (!u)
return -ENOMEM;
if (r < 0)
return r;
- p = filename_escape(info[INFO_PID]);
+ p = filename_escape(context[CONTEXT_PID]);
if (!p)
return -ENOMEM;
- t = filename_escape(info[INFO_TIMESTAMP]);
+ t = filename_escape(context[CONTEXT_TIMESTAMP]);
if (!t)
return -ENOMEM;
}
static int save_external_coredump(
- const char *info[_INFO_LEN],
- uid_t uid,
+ const char *context[_CONTEXT_MAX],
+ int input_fd,
char **ret_filename,
int *ret_node_fd,
int *ret_data_fd,
_cleanup_free_ char *fn = NULL, *tmp = NULL;
_cleanup_close_ int fd = -1;
struct stat st;
+ uid_t uid;
int r;
- assert(info);
+ assert(context);
assert(ret_filename);
assert(ret_node_fd);
assert(ret_data_fd);
assert(ret_size);
- r = make_filename(info, &fn);
+ r = parse_uid(context[CONTEXT_UID], &uid);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse UID: %m");
+
+ r = make_filename(context, &fn);
if (r < 0)
return log_error_errno(r, "Failed to determine coredump file name: %m");
if (fd < 0)
return log_error_errno(errno, "Failed to create coredump file %s: %m", tmp);
- r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max, false);
+ r = copy_bytes(input_fd, fd, arg_process_size_max, false);
if (r == -EFBIG) {
- log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]);
+ 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.", info[INFO_PID], info[INFO_COMM]);
+ 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_compressed;
}
- r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid);
+ r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, context, uid);
if (r < 0)
goto fail_compressed;
return 0;
fail_compressed:
- unlink_noerrno(tmp_compressed);
+ (void) unlink(tmp_compressed);
}
uncompressed:
#endif
- r = fix_permissions(fd, tmp, fn, info, uid);
+ r = fix_permissions(fd, tmp, fn, context, uid);
if (r < 0)
goto fail;
return 0;
fail:
- unlink_noerrno(tmp);
+ (void) unlink(tmp);
return r;
}
return 0;
}
-int main(int argc, char* argv[]) {
+static int change_uid_gid(const char *context[]) {
+ uid_t uid;
+ gid_t gid;
+ int r;
- /* The small core field we allocate on the stack, to keep things simple */
- char
- *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
- *core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL,
- *core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL,
- *core_slice = NULL;
+ r = parse_uid(context[CONTEXT_UID], &uid);
+ if (r < 0)
+ return r;
- /* The larger ones we allocate on the heap */
- _cleanup_free_ char
- *core_timestamp = NULL, *core_message = NULL, *coredump_data = NULL, *core_owner_uid = NULL,
- *core_open_fds = NULL, *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL,
- *core_proc_cgroup = NULL, *core_environ = NULL;
+ r = parse_gid(context[CONTEXT_GID], &gid);
+ if (r < 0)
+ return r;
+
+ return drop_privileges(uid, gid, 0);
+}
- _cleanup_free_ char *exe = NULL, *comm = NULL, *filename = NULL;
- const char *info[_INFO_LEN];
+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;
-
- struct iovec iovec[26];
+ _cleanup_free_ char *core_message = NULL, *filename = NULL, *coredump_data = NULL;
uint64_t coredump_size;
- int r, j = 0;
- uid_t uid, owner_uid;
- gid_t gid;
- pid_t pid;
- char *t;
- const char *p;
+ int r;
- /* Make sure we never enter a loop */
- prctl(PR_SET_DUMPABLE, 0);
+ assert(context);
+ assert(iovec);
+ assert(n_iovec_allocated >= n_iovec + 3);
+ assert(input_fd >= 0);
- /* First, log to a safe place, since we don't know what
- * crashed and it might be journald which we'd rather not log
- * to then. */
- log_set_target(LOG_TARGET_KMSG);
- log_open();
+ /* Vacuum before we write anything again */
+ (void) coredump_vacuum(-1, arg_keep_free, arg_max_use);
- if (argc < INFO_COMM + 1) {
- log_error("Not enough arguments passed from kernel (%d, expected %d).",
- argc - 1, INFO_COMM + 1 - 1);
- r = -EINVAL;
- goto finish;
+ /* 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);
}
- /* Ignore all parse errors */
- parse_config();
+ /* 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);
- log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage));
- log_debug("Selected compression %s.", yes_no(arg_compress));
+ /* 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");
- r = parse_uid(argv[INFO_UID + 1], &uid);
- if (r < 0) {
- log_error("Failed to parse UID.");
- goto finish;
+#ifdef HAVE_ELFUTILS
+ /* Try to get a strack trace if we can */
+ if (coredump_size <= arg_process_size_max) {
+ _cleanup_free_ char *stacktrace = NULL;
+
+ r = coredump_make_stack_trace(coredump_fd, 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");
}
- r = parse_pid(argv[INFO_PID + 1], &pid);
- if (r < 0) {
- log_error("Failed to parse PID.");
- goto finish;
+ 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++;
+ }
}
- r = parse_gid(argv[INFO_GID + 1], &gid);
- if (r < 0) {
- log_error("Failed to parse GID.");
+ 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=",
+ };
+
+ 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;
+ int l;
+
+ if (!GREEDY_REALLOC(iovec, n_iovec_allocated, n_iovec + 3)) {
+ r = log_oom();
+ goto finish;
+ }
+
+ if (ioctl(fd, FIONREAD, &l) < 0) {
+ r = log_error_errno(errno, "FIONREAD failed: %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;
}
- if (get_process_comm(pid, &comm) < 0) {
- log_warning("Failed to get COMM, falling back to the command line.");
- comm = strv_join(argv + INFO_COMM + 1, " ");
+ /* 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_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, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path)) < 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");
}
- if (get_process_exe(pid, &exe) < 0)
- log_warning("Failed to get EXE.");
+ r = send_one_fd(fd, input_fd, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to send coredump fd: %m");
- info[INFO_PID] = argv[INFO_PID + 1];
- info[INFO_UID] = argv[INFO_UID + 1];
- info[INFO_GID] = argv[INFO_GID + 1];
- info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1];
- info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1];
- info[INFO_COMM] = comm;
- info[INFO_EXE] = exe;
+ return 0;
+}
- if (cg_pid_get_unit(pid, &t) >= 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;
- if (streq(t, SPECIAL_JOURNALD_SERVICE)) {
- free(t);
+ 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 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;
+ if (arg_storage != COREDUMP_STORAGE_NONE)
+ arg_storage = COREDUMP_STORAGE_EXTERNAL;
- r = save_external_coredump(info, uid, &filename, &coredump_node_fd, &coredump_fd, &coredump_size);
- if (r < 0)
- goto finish;
+ 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)
- goto finish;
+ 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);
- goto finish;
+ 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;
+
+ /* 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[24];
+ 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_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);
- } else if (cg_pid_get_user_unit(pid, &t) >= 0) {
- core_unit = strjoina("COREDUMP_USER_UNIT=", t);
- free(t);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_unit);
}
- if (core_unit)
- IOVEC_SET_STRING(iovec[j++], core_unit);
-
- /* OK, now we know it's not the journal, hence we can make use
- * of it now. */
+ /* OK, now we know it's not the journal, hence we can make use of it now. */
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_open();
- core_pid = strjoina("COREDUMP_PID=", info[INFO_PID]);
- IOVEC_SET_STRING(iovec[j++], core_pid);
+ 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=", info[INFO_UID]);
- IOVEC_SET_STRING(iovec[j++], core_uid);
+ core_uid = strjoina("COREDUMP_UID=", context[CONTEXT_UID]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_uid);
- core_gid = strjoina("COREDUMP_GID=", info[INFO_GID]);
- IOVEC_SET_STRING(iovec[j++], core_gid);
+ core_gid = strjoina("COREDUMP_GID=", context[CONTEXT_GID]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_gid);
- core_signal = strjoina("COREDUMP_SIGNAL=", info[INFO_SIGNAL]);
- IOVEC_SET_STRING(iovec[j++], core_signal);
+ core_signal = strjoina("COREDUMP_SIGNAL=", context[CONTEXT_SIGNAL]);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_signal);
if (sd_pid_get_session(pid, &t) >= 0) {
core_session = strjoina("COREDUMP_SESSION=", t);
free(t);
- IOVEC_SET_STRING(iovec[j++], core_session);
+ 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);
+ r = asprintf(&core_owner_uid, "COREDUMP_OWNER_UID=" UID_FMT, owner_uid);
if (r > 0)
- IOVEC_SET_STRING(iovec[j++], core_owner_uid);
+ 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[j++], core_slice);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_slice);
}
if (comm) {
core_comm = strjoina("COREDUMP_COMM=", comm);
- IOVEC_SET_STRING(iovec[j++], core_comm);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_comm);
}
if (exe) {
core_exe = strjoina("COREDUMP_EXE=", exe);
- IOVEC_SET_STRING(iovec[j++], core_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[j++], core_cmdline);
+ 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[j++], core_cgroup);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_cgroup);
}
if (compose_open_fds(pid, &t) >= 0) {
free(t);
if (core_open_fds)
- IOVEC_SET_STRING(iovec[j++], core_open_fds);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_open_fds);
}
p = procfs_file_alloca(pid, "status");
free(t);
if (core_proc_status)
- IOVEC_SET_STRING(iovec[j++], core_proc_status);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_proc_status);
}
p = procfs_file_alloca(pid, "maps");
free(t);
if (core_proc_maps)
- IOVEC_SET_STRING(iovec[j++], core_proc_maps);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_proc_maps);
}
p = procfs_file_alloca(pid, "limits");
free(t);
if (core_proc_limits)
- IOVEC_SET_STRING(iovec[j++], core_proc_limits);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_proc_limits);
}
p = procfs_file_alloca(pid, "cgroup");
free(t);
if (core_proc_cgroup)
- IOVEC_SET_STRING(iovec[j++], 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[j++], core_cwd);
+ 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[j++], core_root);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_root);
}
if (get_process_environ(pid, &t) >= 0) {
free(t);
if (core_environ)
- IOVEC_SET_STRING(iovec[j++], core_environ);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_environ);
}
- core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL);
- if (core_timestamp)
- IOVEC_SET_STRING(iovec[j++], core_timestamp);
+ core_timestamp = strjoina("COREDUMP_TIMESTAMP=", context[CONTEXT_TIMESTAMP], "000000", NULL);
+ IOVEC_SET_STRING(iovec[n_iovec++], core_timestamp);
- IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
+ IOVEC_SET_STRING(iovec[n_iovec++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
assert_cc(2 == LOG_CRIT);
- IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");
-
- /* Vacuum before we write anything again */
- coredump_vacuum(-1, arg_keep_free, arg_max_use);
+ IOVEC_SET_STRING(iovec[n_iovec++], "PRIORITY=2");
- /* Always stream the coredump to disk, if that's possible */
- r = save_external_coredump(info, uid, &filename, &coredump_node_fd, &coredump_fd, &coredump_size);
- if (r < 0)
- /* skip whole core dumping part */
- goto log;
+ assert(n_iovec <= ELEMENTSOF(iovec));
- /* If we don't want to keep the coredump on disk, remove it
- * now, as later on we will lack the privileges for
- * it. However, we keep the fd to it, so that we can still
- * process it and log it. */
- r = maybe_remove_external_coredump(filename, coredump_size);
- if (r < 0)
- goto finish;
- if (r == 0) {
- const char *coredump_filename;
-
- coredump_filename = strjoina("COREDUMP_FILENAME=", filename);
- IOVEC_SET_STRING(iovec[j++], coredump_filename);
- }
+ return send_iovec(iovec, n_iovec, STDIN_FILENO);
+}
- /* Vacuum again, but exclude the coredump we just created */
- 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 = drop_privileges(uid, gid, 0);
- if (r < 0) {
- log_error_errno(r, "Failed to drop privileges: %m");
- goto finish;
- }
+int main(int argc, char *argv[]) {
+ int r;
-#ifdef HAVE_ELFUTILS
- /* Try to get a strack trace if we can */
- if (coredump_size <= arg_process_size_max) {
- _cleanup_free_ char *stacktrace = NULL;
+ /* 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. */
- r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace);
- if (r >= 0)
- core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL);
- else if (r == -EINVAL)
- log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno()));
- else
- log_warning_errno(r, "Failed to generate stack trace: %m");
- }
+ log_set_target(LOG_TARGET_KMSG);
+ log_open();
- if (!core_message)
-#endif
-log:
- core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL);
- if (core_message)
- IOVEC_SET_STRING(iovec[j++], core_message);
+ /* Make sure we never enter a loop */
+ (void) prctl(PR_SET_DUMPABLE, 0);
- /* 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;
+ /* Ignore all parse errors */
+ (void) parse_config();
- /* Store the coredump itself in the journal */
+ log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage));
+ log_debug("Selected compression %s.", yes_no(arg_compress));
- r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz);
- if (r >= 0) {
- iovec[j].iov_base = coredump_data;
- iovec[j].iov_len = sz;
- j++;
- }
+ r = sd_listen_fds(false);
+ if (r < 0) {
+ log_error_errno(r, "Failed to determine number of file descriptor: %m");
+ goto finish;
}
- r = sd_journal_sendv(iovec, j);
- if (r < 0)
- log_error_errno(r, "Failed to log coredump: %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)
+ 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;
projects / thirdparty / systemd.git / commitdiff
