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Merge pull request #25 from stoeckmann/sigrace

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Fixed signal races in shadow tools.
This commit is contained in:
Serge Hallyn 2016-08-04 23:38:24 -05:00 committed by GitHub
commit 8f1836bad9
5 changed files with 20 additions and 15 deletions
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2
src/expiry.c
View File

@ -58,7 +58,7 @@ static void process_flags (int argc, char **argv);
*/
static RETSIGTYPE catch_signals (unused int sig)
{
exit (10);
_exit (10);
}
/*

5
src/gpasswd.c
View File

@ -169,9 +169,8 @@ static RETSIGTYPE catch_signals (int killed)
}
if (0 != killed) {
(void) putchar ('\n');
(void) fflush (stdout);
exit (killed);
(void) write (STDOUT_FILENO, "\n", 1);
_exit (killed);
}
}

11
src/login.c
View File

@ -103,7 +103,7 @@ static bool hflg = false;
static bool preauth_flag = false;
static bool amroot;
static unsigned int timeout;
static char tmsg[256];
/*
* External identifiers.
@ -416,8 +416,8 @@ static void init_env (void)
static RETSIGTYPE alarm_handler (unused int sig)
{
fprintf (stderr, _("\nLogin timed out after %u seconds.\n"), timeout);
exit (0);
write (STDERR_FILENO, tmsg, strlen (tmsg));
_exit (0);
}
#ifdef USE_PAM
@ -532,6 +532,7 @@ int main (int argc, char **argv)
bool is_console;
#endif
int err;
unsigned int timeout;
const char *cp;
const char *tmp;
char fromhost[512];
@ -698,8 +699,10 @@ int main (int argc, char **argv)
top:
/* only allow ALARM sec. for login */
(void) signal (SIGALRM, alarm_handler);
timeout = getdef_unum ("LOGIN_TIMEOUT", ALARM);
snprintf (tmsg, sizeof tmsg,
_("\nLogin timed out after %u seconds.\n"), timeout);
(void) signal (SIGALRM, alarm_handler);
if (timeout > 0) {
(void) alarm (timeout);
}

15
src/su.c
View File

@ -105,6 +105,8 @@ static char caller_name[BUFSIZ];
static bool change_environment = true;
#ifdef USE_PAM
static char kill_msg[256];
static char wait_msg[256];
static pam_handle_t *pamh = NULL;
static int caught = 0;
/* PID of the child, in case it needs to be killed */
@ -161,8 +163,7 @@ static RETSIGTYPE die (int killed)
}
if (killed != 0) {
closelog ();
exit (128+killed);
_exit (128+killed);
}
}
@ -182,12 +183,11 @@ static RETSIGTYPE kill_child (int unused(s))
{
if (0 != pid_child) {
(void) kill (-pid_child, SIGKILL);
(void) fputs (_(" ...killed.\n"), stderr);
(void) write (STDERR_FILENO, kill_msg, strlen (kill_msg));
} else {
(void) fputs (_(" ...waiting for child to terminate.\n"),
stderr);
(void) write (STDERR_FILENO, wait_msg, strlen (wait_msg));
}
exit (255);
_exit (255);
}
#endif /* USE_PAM */
@ -373,6 +373,9 @@ static void prepare_pam_close_session (void)
stderr);
(void) kill (-pid_child, caught);
snprintf (kill_msg, _(" ...killed.\n"));
snprintf (wait_msg, _(" ...waiting for child to terminate.\n"));
(void) signal (SIGALRM, kill_child);
(void) alarm (2);

2
src/sulogin.c
View File

@ -70,7 +70,7 @@ static RETSIGTYPE catch_signals (int);
static RETSIGTYPE catch_signals (unused int sig)
{
exit (1);
_exit (1);
}
/*