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process-util: add new FORK_NEW_MOUNTNS flag to safe_fork()

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That way we can move one more code location to use safe_fork()
This commit is contained in:
Lennart Poettering 2017-12-29 18:52:20 +01:00
parent 3f60395254
commit be39f6ee31
3 changed files with 8 additions and 12 deletions
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3
src/basic/process-util.c
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@ -1199,6 +1199,9 @@ int safe_fork_full(
if (sigprocmask(SIG_SETMASK, &ss, &saved_ss) < 0)
return log_full_errno(prio, errno, "Failed to set signal mask: %m");
if (flags & FORK_NEW_MOUNTNS)
pid = raw_clone(SIGCHLD|CLONE_NEWNS);
else
pid = fork();
if (pid < 0) {
r = -errno;

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

@ -168,6 +168,7 @@ typedef enum ForkFlags {
FORK_REOPEN_LOG = 1U << 4,
FORK_LOG = 1U << 5,
FORK_WAIT = 1U << 6,
FORK_NEW_MOUNTNS = 1U << 7,
} ForkFlags;
int safe_fork_full(const char *name, const int except_fds[], size_t n_except_fds, ForkFlags flags, pid_t *ret_pid);

14
src/shared/dissect-image.c
View File

@ -1259,18 +1259,10 @@ int dissected_image_acquire_metadata(DissectedImage *m) {
if (r < 0)
goto finish;
child = raw_clone(SIGCHLD|CLONE_NEWNS);
if (child < 0) {
r = -errno;
r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS, &child);
if (r < 0)
goto finish;
}
if (child == 0) {
(void) reset_all_signal_handlers();
(void) reset_signal_mask();
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
if (r == 0) {
/* Make sure we never propagate to the host */
if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) < 0)
_exit(EXIT_FAILURE);