systemd/fix-popen.patch

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2011-02-09 00:20:32 +00:00
diff --git a/src/systemctl.c b/src/systemctl.c
index 8cdc01a..c09b31d 100644
--- a/src/systemctl.c
+++ b/src/systemctl.c
@@ -141,6 +141,9 @@ static void spawn_ask_password_agent(void) {
if (!arg_ask_password)
return;
+ if (arg_user)
+ return;
+
parent = getpid();
/* Spawns a temporary TTY agent, making sure it goes away when
@@ -151,13 +154,15 @@ 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 +171,31 @@ 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)) < 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);
}