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systemctl: make sure the tty agent does not retain a copy of stdio

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=674916
This commit is contained in:
Lennart Poettering 2011-02-09 00:58:43 +01:00
parent cd3f8b7ddb
commit 7f6d613516
3 changed files with 43 additions and 2 deletions
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14
TODO
View File

@ -14,6 +14,20 @@ Bugs:
Features:
* make it possible to enable status msgs via RT sigs
* udisks should not use udisks-part-id, instead use blkid. also not probe /dev/loopxxx
* snd-seq muss weg
* mount.tmpfs soll weg und grep weg
* mdmon is irre
* gnome-shell python script/glxinfo/is-accelerated wech
* plymouth muss sauber exiten, wenn's schon läuft
* pull in by udev change event instead of only start event
* PID heuristik bei Type=forking ausmachbar machen

29
src/systemctl.c
View File

@ -151,13 +151,15 @@ static void spawn_ask_password_agent(void) {
if (child == 0) {
/* In the child */
const char * const args[] = {
SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH,
"--watch",
NULL
};
int fd;
/* Make sure the agent goes away when the parent dies */
if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
_exit(EXIT_FAILURE);
@ -166,6 +168,31 @@ static void spawn_ask_password_agent(void) {
if (getppid() != parent)
_exit(EXIT_SUCCESS);
/* Don't leak fds to the agent */
close_all_fds(NULL, 0);
/* Detach from stdin/stdout/stderr. and reopen
* /dev/tty for them. This is important to ensure that
* when systemctl is started via popen() or a similar
* call that expects to read EOF we actually do
* generate EOF and not delay this indefinitely by
* because we keep an unused copy of stdin around. */
if ((fd = open("/dev/tty", O_RDWR|O_CLOEXEC|O_NONBLOCK)) < 0) {
log_error("Failed to open /dev/tty: %m");
_exit(EXIT_FAILURE);
}
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > 2)
close(fd);
execv(args[0], (char **) args);
_exit(EXIT_FAILURE);
}

2
src/tty-ask-password-agent.c
View File

@ -83,7 +83,7 @@ static int ask_password_plymouth(const char *message, usec_t until, const char *
sa.sa.sa_family = AF_UNIX;
strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
log_error("FIALED TO CONNECT: %m");
log_error("FAILED TO CONNECT: %m");
r = -errno;
goto finish;
}