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Merge pull request #9297 from yuwata/rfe-9296

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timesync: ignore any errors related to timestamp file
This commit is contained in:
Lennart Poettering 2018-06-14 10:22:11 +02:00 committed by GitHub
commit c7e6744fa8
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4 changed files with 42 additions and 25 deletions
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16
src/basic/fs-util.c
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@ -230,6 +230,22 @@ int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
return 0;
}
int fchmod_and_chown(int fd, mode_t mode, uid_t uid, gid_t gid) {
/* Under the assumption that we are running privileged we
* first change the access mode and only then hand out
* ownership to avoid a window where access is too open. */
if (mode != MODE_INVALID)
if (fchmod(fd, mode) < 0)
return -errno;
if (uid != UID_INVALID || gid != GID_INVALID)
if (fchown(fd, uid, gid) < 0)
return -errno;
return 0;
}
int fchmod_umask(int fd, mode_t m) {
mode_t u;
int r;

1
src/basic/fs-util.h
View File

@ -31,6 +31,7 @@ int readlink_value(const char *p, char **ret);
int readlink_and_make_absolute(const char *p, char **r);
int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
int fchmod_and_chown(int fd, mode_t mode, uid_t uid, gid_t gid);
int fchmod_umask(int fd, mode_t mode);
int fchmod_opath(int fd, mode_t m);

16
src/sysusers/sysusers.c
View File

@ -212,11 +212,9 @@ static int make_backup(const char *target, const char *x) {
backup = strjoina(x, "-");
/* Copy over the access mask */
if (fchmod(fileno(dst), st.st_mode & 07777) < 0)
log_warning_errno(errno, "Failed to change mode on %s: %m", backup);
if (fchown(fileno(dst), st.st_uid, st.st_gid)< 0)
log_warning_errno(errno, "Failed to change ownership of %s: %m", backup);
r = fchmod_and_chown(fileno(dst), st.st_mode & 07777, st.st_uid, st.st_gid);
if (r < 0)
log_warning_errno(r, "Failed to change access mode or ownership of %s: %m", backup);
ts[0] = st.st_atim;
ts[1] = st.st_mtim;
@ -335,13 +333,7 @@ static int sync_rights(FILE *from, FILE *to) {
if (fstat(fileno(from), &st) < 0)
return -errno;
if (fchmod(fileno(to), st.st_mode & 07777) < 0)
return -errno;
if (fchown(fileno(to), st.st_uid, st.st_gid) < 0)
return -errno;
return 0;
return fchmod_and_chown(fileno(to), st.st_mode & 07777, st.st_uid, st.st_gid);
}
static int rename_and_apply_smack(const char *temp_path, const char *dest_path) {

38
src/timesync/timesyncd.c
View File

@ -21,6 +21,9 @@
#include "timesyncd-manager.h"
#include "user-util.h"
#define STATE_DIR "/var/lib/systemd/timesync"
#define CLOCK_FILE STATE_DIR "/clock"
static int load_clock_timestamp(uid_t uid, gid_t gid) {
_cleanup_close_ int fd = -1;
usec_t min = TIME_EPOCH * USEC_PER_SEC;
@ -34,7 +37,7 @@ static int load_clock_timestamp(uid_t uid, gid_t gid) {
* systems lacking a battery backed RTC. We also will adjust
* the time to at least the build time of systemd. */
fd = open("/var/lib/systemd/timesync/clock", O_RDWR|O_CLOEXEC, 0644);
fd = open(CLOCK_FILE, O_RDWR|O_CLOEXEC, 0644);
if (fd >= 0) {
struct stat st;
usec_t stamp;
@ -50,24 +53,26 @@ static int load_clock_timestamp(uid_t uid, gid_t gid) {
if (geteuid() == 0) {
/* Try to fix the access mode, so that we can still
touch the file after dropping priviliges */
r = fchmod(fd, 0644);
r = fchmod_and_chown(fd, 0644, uid, gid);
if (r < 0)
return log_error_errno(errno, "Failed to change file access mode: %m");
r = fchown(fd, uid, gid);
if (r < 0)
return log_error_errno(errno, "Failed to change file owner: %m");
log_warning_errno(r, "Failed to chmod or chown %s, ignoring: %m", CLOCK_FILE);
}
} else {
r = mkdir_safe_label("/var/lib/systemd/timesync", 0755, uid, gid,
r = mkdir_safe_label(STATE_DIR, 0755, uid, gid,
MKDIR_FOLLOW_SYMLINK | MKDIR_WARN_MODE);
if (r < 0)
return log_error_errno(r, "Failed to create state directory: %m");
/* create stamp file with the compiled-in date */
(void) touch_file("/var/lib/systemd/timesync/clock", false, min, uid, gid, 0644);
if (r < 0) {
log_debug_errno(r, "Failed to create state directory, ignoring: %m");
goto settime;
}
/* create stamp file with the compiled-in date */
r = touch_file(CLOCK_FILE, false, min, uid, gid, 0644);
if (r < 0)
log_debug_errno(r, "Failed to create %s, ignoring: %m", CLOCK_FILE);
}
settime:
ct = now(CLOCK_REALTIME);
if (ct < min) {
struct timespec ts;
@ -77,7 +82,7 @@ static int load_clock_timestamp(uid_t uid, gid_t gid) {
format_timestamp(date, sizeof(date), min));
if (clock_settime(CLOCK_REALTIME, timespec_store(&ts, min)) < 0)
log_error_errno(errno, "Failed to restore system clock: %m");
log_error_errno(errno, "Failed to restore system clock, ignoring: %m");
}
return 0;
@ -174,8 +179,11 @@ int main(int argc, char *argv[]) {
}
/* if we got an authoritative time, store it in the file system */
if (m->sync)
(void) touch("/var/lib/systemd/timesync/clock");
if (m->sync) {
r = touch(CLOCK_FILE);
if (r < 0)
log_debug_errno(r, "Failed to touch %s, ignoring: %m", CLOCK_FILE);
}
sd_event_get_exit_code(m->event, &r);