a77b4f397
Mike Frysinger
2005-04-16
Subject
jfb2 writes in Bug 119: The init applet will restart (re-exec) itsself when it receives a SIGHUP. However, just before it enters its main loop, it resets SIGHUP to either re-load the inittab (or ignore it if no inittab is used). Thus preventing the re-exec option from being triggerable.
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init/init.c+4 -0
| @@ -453,6 +453,7 @@ static pid_t run(const struct init_action *a) | |
| signal(SIGINT, SIG_DFL); | |
| signal(SIGTERM, SIG_DFL); | |
| signal(SIGHUP, SIG_DFL); | |
| + | signal(SIGQUIT, SIG_DFL); |
| signal(SIGCONT, SIG_DFL); | |
| signal(SIGSTOP, SIG_DFL); | |
| signal(SIGTSTP, SIG_DFL); | |
| @@ -693,6 +694,7 @@ static void shutdown_system(void) | |
| /* first disable all our signals */ | |
| sigemptyset(&block_signals); | |
| sigaddset(&block_signals, SIGHUP); | |
| + | sigaddset(&block_signals, SIGQUIT); |
| sigaddset(&block_signals, SIGCHLD); | |
| sigaddset(&block_signals, SIGUSR1); | |
| sigaddset(&block_signals, SIGUSR2); | |
| @@ -737,6 +739,7 @@ static void exec_signal(int sig) | |
| /* unblock all signals, blocked in shutdown_system() */ | |
| sigemptyset(&unblock_signals); | |
| sigaddset(&unblock_signals, SIGHUP); | |
| + | sigaddset(&unblock_signals, SIGQUIT); |
| sigaddset(&unblock_signals, SIGCHLD); | |
| sigaddset(&unblock_signals, SIGUSR1); | |
| sigaddset(&unblock_signals, SIGUSR2); | |
| @@ -1097,6 +1100,7 @@ extern int init_main(int argc, char **argv) | |
| /* Set up sig handlers -- be sure to | |
| * clear all of these in run() */ | |
| signal(SIGHUP, exec_signal); | |
| + | signal(SIGQUIT, exec_signal); |
| signal(SIGUSR1, halt_signal); | |
| signal(SIGUSR2, halt_signal); | |
| signal(SIGINT, ctrlaltdel_signal); | |