mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-10-27 01:55:32 +03:00
coredump: include stacktrace of coredumps in the log message
elfutils' libdw is maintained, can read DWARF debug data and appears to be the library of choice for generating backtraces today.
This commit is contained in:
parent
8271bd16ce
commit
8d4e028f18
@ -3686,6 +3686,15 @@ systemd_coredump_LDADD = \
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libsystemd-internal.la \
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libsystemd-internal.la \
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libsystemd-shared.la
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libsystemd-shared.la
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if HAVE_ELFUTILS
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systemd_coredump_SOURCES += \
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src/journal/stacktrace.c \
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src/journal/stacktrace.h
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systemd_coredump_LDADD += \
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$(ELFUTILS_LIBS)
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endif
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rootlibexec_PROGRAMS += \
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rootlibexec_PROGRAMS += \
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systemd-coredump
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systemd-coredump
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39
configure.ac
39
configure.ac
@ -626,6 +626,44 @@ else
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fi
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fi
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AC_SUBST(AUDIT_LIBS)
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AC_SUBST(AUDIT_LIBS)
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# ------------------------------------------------------------------------------
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AC_ARG_ENABLE([elfutils],
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AS_HELP_STRING([--disable-elfutils],[Disable optional ELFUTILS support]),
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[case "${enableval}" in
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yes) have_elfutils=yes ;;
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no) have_elfutils=no ;;
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*) AC_MSG_ERROR(bad value ${enableval} for --disable-elfutils) ;;
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esac],
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[have_elfutils=auto])
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if test "x${have_elfutils}" != xno ; then
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AC_CHECK_HEADERS(
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[elfutils/libdwfl.h],
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[have_elfutils=yes],
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[if test "x$have_elfutils" = xyes ; then
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AC_MSG_ERROR([*** ELFUTILS headers not found.])
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fi])
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AC_CHECK_LIB(
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[dw],
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[dwfl_begin],
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[have_elfutils=yes],
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[if test "x$have_elfutils" = xyes ; then
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AC_MSG_ERROR([*** ELFUTILS libs not found.])
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fi])
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if test "x$have_elfutils" = xyes ; then
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ELFUTILS_LIBS="-lelf -ldw"
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AC_DEFINE(HAVE_ELFUTILS, 1, [ELFUTILS available])
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else
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have_elfutils=no
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fi
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else
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ELFUTILS_LIBS=
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fi
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AC_SUBST(ELFUTILS_LIBS)
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AM_CONDITIONAL(HAVE_ELFUTILS, [test "$have_elfutils" = "yes"])
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# ------------------------------------------------------------------------------
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# ------------------------------------------------------------------------------
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have_libcryptsetup=no
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have_libcryptsetup=no
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AC_ARG_ENABLE(libcryptsetup, AS_HELP_STRING([--disable-libcryptsetup], [disable libcryptsetup tools]))
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AC_ARG_ENABLE(libcryptsetup, AS_HELP_STRING([--disable-libcryptsetup], [disable libcryptsetup tools]))
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@ -1171,6 +1209,7 @@ AC_MSG_RESULT([
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MICROHTTPD: ${have_microhttpd}
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MICROHTTPD: ${have_microhttpd}
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CHKCONFIG: ${have_chkconfig}
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CHKCONFIG: ${have_chkconfig}
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GNUTLS: ${have_gnutls}
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GNUTLS: ${have_gnutls}
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ELFUTILS: ${have_elfutils}
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binfmt: ${have_binfmt}
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binfmt: ${have_binfmt}
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vconsole: ${have_vconsole}
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vconsole: ${have_vconsole}
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readahead: ${have_readahead}
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readahead: ${have_readahead}
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@ -38,6 +38,7 @@
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#include "journald-native.h"
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#include "journald-native.h"
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#include "conf-parser.h"
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#include "conf-parser.h"
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#include "copy.h"
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#include "copy.h"
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#include "stacktrace.h"
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#ifdef HAVE_ACL
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#ifdef HAVE_ACL
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#include <sys/acl.h>
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#include <sys/acl.h>
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@ -290,6 +291,7 @@ static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_s
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_cleanup_free_ char *field = NULL;
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_cleanup_free_ char *field = NULL;
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ssize_t n;
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ssize_t n;
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assert(fd >= 0);
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assert(ret);
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assert(ret);
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assert(ret_size);
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assert(ret_size);
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@ -346,7 +348,8 @@ int main(int argc, char* argv[]) {
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_cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
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_cleanup_free_ char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL,
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*core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL,
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*core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL,
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*core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL,
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*core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *coredump_data = NULL,
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*coredump_filename = NULL, *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL;
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*coredump_filename = NULL, *core_slice = NULL, *core_cgroup = NULL, *core_owner_uid = NULL,
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*exe = NULL;
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_cleanup_close_ int coredump_fd = -1;
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_cleanup_close_ int coredump_fd = -1;
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@ -365,7 +368,6 @@ int main(int argc, char* argv[]) {
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* crashed and it might be journald which we'd rather not log
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* crashed and it might be journald which we'd rather not log
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* to then. */
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* to then. */
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log_set_target(LOG_TARGET_KMSG);
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log_set_target(LOG_TARGET_KMSG);
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log_set_max_level(LOG_DEBUG);
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log_open();
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log_open();
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if (argc != _ARG_MAX) {
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if (argc != _ARG_MAX) {
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@ -474,10 +476,8 @@ int main(int argc, char* argv[]) {
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IOVEC_SET_STRING(iovec[j++], core_slice);
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IOVEC_SET_STRING(iovec[j++], core_slice);
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}
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}
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if (get_process_exe(pid, &t) >= 0) {
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if (get_process_exe(pid, &exe) >= 0) {
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core_exe = strappend("COREDUMP_EXE=", t);
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core_exe = strappend("COREDUMP_EXE=", exe);
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free(t);
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if (core_exe)
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if (core_exe)
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IOVEC_SET_STRING(iovec[j++], core_exe);
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IOVEC_SET_STRING(iovec[j++], core_exe);
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}
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}
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@ -505,17 +505,15 @@ int main(int argc, char* argv[]) {
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IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
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IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1");
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IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");
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IOVEC_SET_STRING(iovec[j++], "PRIORITY=2");
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core_message = strjoin("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") dumped core.", NULL);
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if (core_message)
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IOVEC_SET_STRING(iovec[j++], core_message);
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/* Always stream the coredump to disk, if that's possible */
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/* Always stream the coredump to disk, if that's possible */
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r = save_external_coredump(argv, uid, &coredump_filename, &coredump_fd, &coredump_size);
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r = save_external_coredump(argv, uid, &coredump_filename, &coredump_fd, &coredump_size);
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if (r < 0)
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if (r < 0)
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goto finish;
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goto finish;
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/* If we don't want to keep the coredump on disk, remove it
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/* If we don't want to keep the coredump on disk, remove it
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* now, as later on we will lack the privileges for it. */
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* now, as later on we will lack the privileges for
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* it. However, we keep the fd to it, so that we can still
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* process it and log it. */
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r = maybe_remove_external_coredump(coredump_filename, coredump_size);
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r = maybe_remove_external_coredump(coredump_filename, coredump_size);
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if (r < 0)
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if (r < 0)
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goto finish;
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goto finish;
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@ -532,6 +530,24 @@ int main(int argc, char* argv[]) {
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goto finish;
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goto finish;
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}
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}
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#ifdef HAVE_ELFUTILS
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/* Try to get a strack trace if we can */
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if (coredump_size <= arg_process_size_max) {
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_cleanup_free_ char *stacktrace = NULL;
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r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace);
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if (r >= 0)
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core_message = strjoin("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") of user ", argv[ARG_UID], " dumped core.\n\n", stacktrace, NULL);
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else
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log_warning("Failed to generate stack trace: %s", strerror(-r));
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}
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if (!core_message)
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#endif
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core_message = strjoin("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") of user ", argv[ARG_UID], " dumped core.", NULL);
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if (core_message)
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IOVEC_SET_STRING(iovec[j++], core_message);
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/* Optionally store the entire coredump in the journal */
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/* Optionally store the entire coredump in the journal */
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if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) &&
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if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) &&
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coredump_size <= (off_t) arg_journal_size_max) {
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coredump_size <= (off_t) arg_journal_size_max) {
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@ -403,7 +403,8 @@ static int print_info(FILE *file, sd_journal *j, bool need_space) {
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*sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
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*sgnl = NULL, *exe = NULL, *comm = NULL, *cmdline = NULL,
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*unit = NULL, *user_unit = NULL, *session = NULL,
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*unit = NULL, *user_unit = NULL, *session = NULL,
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*boot_id = NULL, *machine_id = NULL, *hostname = NULL,
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*boot_id = NULL, *machine_id = NULL, *hostname = NULL,
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*coredump = NULL, *slice = NULL, *cgroup = NULL, *owner_uid = NULL;
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*coredump = NULL, *slice = NULL, *cgroup = NULL,
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*owner_uid = NULL, *message = NULL;
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const void *d;
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const void *d;
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size_t l;
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size_t l;
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@ -427,6 +428,7 @@ static int print_info(FILE *file, sd_journal *j, bool need_space) {
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retrieve(d, l, "_BOOT_ID", &boot_id);
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retrieve(d, l, "_BOOT_ID", &boot_id);
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retrieve(d, l, "_MACHINE_ID", &machine_id);
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retrieve(d, l, "_MACHINE_ID", &machine_id);
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retrieve(d, l, "_HOSTNAME", &hostname);
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retrieve(d, l, "_HOSTNAME", &hostname);
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retrieve(d, l, "MESSAGE", &message);
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}
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}
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if (need_space)
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if (need_space)
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@ -522,6 +524,14 @@ static int print_info(FILE *file, sd_journal *j, bool need_space) {
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if (access(coredump, F_OK) >= 0)
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if (access(coredump, F_OK) >= 0)
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fprintf(file, " Coredump: %s\n", coredump);
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fprintf(file, " Coredump: %s\n", coredump);
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if (message) {
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_cleanup_free_ char *m = NULL;
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m = strreplace(message, "\n", "\n ");
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fprintf(file, " Message: %s\n", strstrip(m ?: message));
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}
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return 0;
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return 0;
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}
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}
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@ -696,7 +706,7 @@ static int run_gdb(sd_journal *j) {
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if (errno == ENOENT)
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if (errno == ENOENT)
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log_error("Coredump neither in journal file nor stored externally on disk.");
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log_error("Coredump neither in journal file nor stored externally on disk.");
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else
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else
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log_error("Failed to access coredump fiile: %s", strerror(-r));
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log_error("Failed to access coredump file: %m");
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return -errno;
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return -errno;
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}
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}
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200
src/journal/stacktrace.c
Normal file
200
src/journal/stacktrace.c
Normal file
@ -0,0 +1,200 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <dwarf.h>
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#include <elfutils/libdwfl.h>
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#include "util.h"
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#include "macro.h"
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#include "stacktrace.h"
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#define FRAMES_MAX 64
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#define THREADS_MAX 64
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struct stack_context {
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FILE *f;
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Dwfl *dwfl;
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Elf *elf;
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unsigned n_thread;
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unsigned n_frame;
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};
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static int frame_callback(Dwfl_Frame *frame, void *userdata) {
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struct stack_context *c = userdata;
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Dwarf_Addr pc, pc_adjusted, bias = 0;
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_cleanup_free_ Dwarf_Die *scopes = NULL;
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const char *fname = NULL, *symbol = NULL;
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Dwfl_Module *module;
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bool is_activation;
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assert(frame);
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assert(c);
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if (c->n_frame >= FRAMES_MAX)
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return DWARF_CB_ABORT;
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if (!dwfl_frame_pc(frame, &pc, &is_activation))
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return DWARF_CB_ABORT;
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pc_adjusted = pc - (is_activation ? 0 : 1);
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module = dwfl_addrmodule(c->dwfl, pc_adjusted);
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if (module) {
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Dwarf_Die *s, *cudie;
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int n;
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cudie = dwfl_module_addrdie(module, pc_adjusted, &bias);
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if (cudie) {
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n = dwarf_getscopes(cudie, pc_adjusted - bias, &scopes);
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for (s = scopes; s < scopes + n; s++) {
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if (IN_SET(dwarf_tag(s), DW_TAG_subprogram, DW_TAG_inlined_subroutine, DW_TAG_entry_point)) {
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Dwarf_Attribute *a, space;
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a = dwarf_attr_integrate(s, DW_AT_MIPS_linkage_name, &space);
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if (!a)
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a = dwarf_attr_integrate(s, DW_AT_linkage_name, &space);
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if (a)
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symbol = dwarf_formstring(a);
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if (!symbol)
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symbol = dwarf_diename(s);
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if (symbol)
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break;
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}
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}
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}
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if (!symbol)
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symbol = dwfl_module_addrname(module, pc_adjusted);
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fname = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
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}
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fprintf(c->f, "#%-2u 0x%016" PRIx64 " %s (%s)\n", c->n_frame, (uint64_t) pc, strna(symbol), strna(fname));
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c->n_frame ++;
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return DWARF_CB_OK;
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}
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static int thread_callback(Dwfl_Thread *thread, void *userdata) {
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struct stack_context *c = userdata;
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pid_t tid;
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assert(thread);
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assert(c);
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|
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if (c->n_thread >= THREADS_MAX)
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return DWARF_CB_ABORT;
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|
if (c->n_thread != 0)
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fputc('\n', c->f);
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||||||
|
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;
|
||||||
|
}
|
||||||
|
|
||||||
|
fclose(c.f);
|
||||||
|
c.f = NULL;
|
||||||
|
|
||||||
|
*ret = buf;
|
||||||
|
buf = NULL;
|
||||||
|
|
||||||
|
r = 0;
|
||||||
|
|
||||||
|
finish:
|
||||||
|
if (c.dwfl)
|
||||||
|
dwfl_end(c.dwfl);
|
||||||
|
|
||||||
|
if (c.elf)
|
||||||
|
elf_end(c.elf);
|
||||||
|
|
||||||
|
if (c.f)
|
||||||
|
fclose(c.f);
|
||||||
|
|
||||||
|
free(buf);
|
||||||
|
|
||||||
|
return r;
|
||||||
|
}
|
24
src/journal/stacktrace.h
Normal file
24
src/journal/stacktrace.h
Normal file
@ -0,0 +1,24 @@
|
|||||||
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||||||
|
|
||||||
|
#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);
|
Loading…
Reference in New Issue
Block a user