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Remove extra flag to sudo_sigaction(). We want to trap the signal

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regardless of whether or not it is ignored by the underlying command
since there's no way to know what signal handlers the command will
install.  Now we just use sudo_sigaction() to set a flag in
saved_signals[] to indicate whether a signal needs to be restored
before exec.
This commit is contained in:
Todd C. Miller
2013-01-19 15:10:01 -05:00
parent a06a14838f
commit e764604485
4 changed files with 56 additions and 47 deletions
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28
src/exec.c
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@@ -113,11 +113,11 @@ static int fork_cmnd(struct command_details *details, int sv[2])
#else
sa.sa_handler = handler;
#endif
sudo_sigaction(SIGCONT, &sa, NULL, false);
sudo_sigaction(SIGCONT, &sa, NULL);
#ifdef SA_SIGINFO
sa.sa_sigaction = handler_user_only;
#endif
sudo_sigaction(SIGTSTP, &sa, NULL, true);
sudo_sigaction(SIGTSTP, &sa, NULL);
/*
* The policy plugin's session init must be run before we fork
@@ -247,12 +247,12 @@ sudo_execute(struct command_details *details, struct command_status *cstat)
#else
sa.sa_handler = handler;
#endif
sudo_sigaction(SIGTERM, &sa, NULL, true);
sudo_sigaction(SIGALRM, &sa, NULL, false); /* XXX - only if there is a timeout */
sudo_sigaction(SIGCHLD, &sa, NULL, false);
sudo_sigaction(SIGPIPE, &sa, NULL, false);
sudo_sigaction(SIGUSR1, &sa, NULL, true);
sudo_sigaction(SIGUSR2, &sa, NULL, true);
sudo_sigaction(SIGTERM, &sa, NULL);
sudo_sigaction(SIGALRM, &sa, NULL); /* XXX - only if there is a timeout */
sudo_sigaction(SIGCHLD, &sa, NULL);
sudo_sigaction(SIGPIPE, &sa, NULL);
sudo_sigaction(SIGUSR1, &sa, NULL);
sudo_sigaction(SIGUSR2, &sa, NULL);
/*
* When not running the command in a pty, we do not want to
@@ -267,9 +267,9 @@ sudo_execute(struct command_details *details, struct command_status *cstat)
sa.sa_sigaction = handler_user_only;
}
#endif
sudo_sigaction(SIGHUP, &sa, NULL, true);
sudo_sigaction(SIGINT, &sa, NULL, true);
sudo_sigaction(SIGQUIT, &sa, NULL, true);
sudo_sigaction(SIGHUP, &sa, NULL);
sudo_sigaction(SIGINT, &sa, NULL);
sudo_sigaction(SIGQUIT, &sa, NULL);
/* Max fd we will be selecting on. */
maxfd = MAX(sv[0], signal_pipe[0]);
@@ -514,12 +514,12 @@ dispatch_signals(int sv[2], pid_t child, int log_io, struct command_status *csta
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_DFL;
sudo_sigaction(SIGTSTP, &sa, &osa, false);
sudo_sigaction(SIGTSTP, &sa, &osa);
}
if (kill(getpid(), signo) != 0)
warning("kill(%d, SIG%s)", (int)getpid(), signame);
if (signo == SIGTSTP)
sudo_sigaction(SIGTSTP, &osa, NULL, false);
sudo_sigaction(SIGTSTP, &osa, NULL);
if (fd != -1) {
/*
* Restore command's process group if different.
@@ -602,7 +602,7 @@ dispatch_pending_signals(struct command_status *cstat)
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_DFL;
sudo_sigaction(SIGTSTP, &sa, NULL, false);
sudo_sigaction(SIGTSTP, &sa, NULL);
if (kill(getpid(), SIGTSTP) != 0)
warning("kill(%d, SIGTSTP)", (int)getpid());
/* No need to reinstall SIGTSTP handler. */