diff options
| -rw-r--r-- | include/linux/sched.h | 2 | ||||
| -rw-r--r-- | init/main.c | 2 | ||||
| -rw-r--r-- | kernel/signal.c | 9 |
3 files changed, 10 insertions, 3 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 0917b3df12d..fe970cdca83 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -561,6 +561,8 @@ struct signal_struct { #define SIGNAL_CLD_CONTINUED 0x00000020 #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) +#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ + /* If true, all threads except ->group_exit_task have pending SIGKILL */ static inline int signal_group_exit(const struct signal_struct *sig) { diff --git a/init/main.c b/init/main.c index 624266b524d..1f4406477f8 100644 --- a/init/main.c +++ b/init/main.c @@ -802,6 +802,8 @@ static int noinline init_post(void) (void) sys_dup(0); (void) sys_dup(0); + current->signal->flags |= SIGNAL_UNKILLABLE; + if (ramdisk_execute_command) { run_init_process(ramdisk_execute_command); printk(KERN_WARNING "Failed to execute %s\n", diff --git a/kernel/signal.c b/kernel/signal.c index 02ef3548aeb..646a8765696 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -728,7 +728,8 @@ static void complete_signal(int sig, struct task_struct *p, int group) * Found a killable thread. If the signal will be fatal, * then start taking the whole group down immediately. */ - if (sig_fatal(p, sig) && !(signal->flags & SIGNAL_GROUP_EXIT) && + if (sig_fatal(p, sig) && + !(signal->flags & (SIGNAL_UNKILLABLE | SIGNAL_GROUP_EXIT)) && !sigismember(&t->real_blocked, sig) && (sig == SIGKILL || !(t->ptrace & PT_PTRACED))) { /* @@ -1615,7 +1616,8 @@ static int do_signal_stop(int signr) } else { struct task_struct *t; - if (!likely(sig->flags & SIGNAL_STOP_DEQUEUED) || + if (unlikely((sig->flags & (SIGNAL_STOP_DEQUEUED | SIGNAL_UNKILLABLE)) + != SIGNAL_STOP_DEQUEUED) || unlikely(signal_group_exit(sig))) return 0; /* @@ -1761,7 +1763,8 @@ relock: /* * Global init gets no signals it doesn't want. */ - if (is_global_init(current)) + if (unlikely(signal->flags & SIGNAL_UNKILLABLE) && + !signal_group_exit(signal)) continue; if (sig_kernel_stop(signr)) { |