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polkit: when spawning off agent, wait until the agent is fully initialized

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This commit is contained in:
Lennart Poettering 2012-04-11 22:37:13 +02:00
parent 4771148bb9
commit 9bdc770ccd
4 changed files with 30 additions and 5 deletions
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4
src/shared/util.c
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@ -6036,7 +6036,7 @@ int fd_inc_rcvbuf(int fd, size_t n) {
return 1;
}
int fork_agent(pid_t *pid, const char *path, ...) {
int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
pid_t parent_pid, agent_pid;
int fd;
bool stdout_is_tty, stderr_is_tty;
@ -6073,7 +6073,7 @@ int fork_agent(pid_t *pid, const char *path, ...) {
_exit(EXIT_SUCCESS);
/* Don't leak fds to the agent */
close_all_fds(NULL, 0);
close_all_fds(except, n_except);
stdout_is_tty = isatty(STDOUT_FILENO);
stderr_is_tty = isatty(STDERR_FILENO);

2
src/shared/util.h
View File

@ -529,6 +529,6 @@ int is_kernel_thread(pid_t pid);
int fd_inc_sndbuf(int fd, size_t n);
int fd_inc_rcvbuf(int fd, size_t n);
int fork_agent(pid_t *pid, const char *path, ...);
int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...);
#endif

5
src/spawn-ask-password-agent.c
View File

@ -44,7 +44,10 @@ int ask_password_agent_open(void) {
if (!isatty(STDIN_FILENO))
return 0;
r = fork_agent(&agent_pid, SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, "--watch", NULL);
r = fork_agent(&agent_pid,
NULL, 0,
SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH,
SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, "--watch", NULL);
if (r < 0)
log_error("Failed to fork TTY ask password agent: %s", strerror(-r));

24
src/spawn-polkit-agent.c
View File

@ -26,6 +26,8 @@
#include <sys/prctl.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/poll.h>
#include "log.h"
#include "util.h"
@ -35,6 +37,8 @@ static pid_t agent_pid = 0;
int polkit_agent_open(void) {
int r;
int pipe_fd[2];
char notify_fd[10 + 1];
if (agent_pid > 0)
return 0;
@ -44,9 +48,27 @@ int polkit_agent_open(void) {
if (!isatty(STDIN_FILENO))
return 0;
r = fork_agent(&agent_pid, POLKIT_AGENT_BINARY_PATH, POLKIT_AGENT_BINARY_PATH, NULL);
if (pipe2(pipe_fd, 0) < 0)
return -errno;
snprintf(notify_fd, sizeof(notify_fd), "%i", pipe_fd[1]);
char_array_0(notify_fd);
r = fork_agent(&agent_pid,
&pipe_fd[1], 1,
POLKIT_AGENT_BINARY_PATH,
POLKIT_AGENT_BINARY_PATH, "--notify-fd", notify_fd, NULL);
/* Close the writing side, because that's the one for the agent */
close_nointr_nofail(pipe_fd[1]);
if (r < 0)
log_error("Failed to fork TTY ask password agent: %s", strerror(-r));
else
/* Wait until the agent closes the fd */
fd_wait_for_event(pipe_fd[0], POLLHUP, (usec_t) -1);
close_nointr_nofail(pipe_fd[0]);
return r;
}