1 files changed, 22 insertions, 0 deletions

diff --git a/arch/ppc/kernel/traps.c b/arch/ppc/kernel/traps.c
index 8356d544fa60..961ede87be72 100644
--- a/arch/ppc/kernel/traps.c
+++ b/arch/ppc/kernel/traps.c
@@ -118,6 +118,28 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
         info.si_code = code;
         info.si_addr = (void __user *) addr;
         force_sig_info(signr, &info, current);
+
+        /*
+         * Init gets no signals that it doesn't have a handler for.
+         * That's all very well, but if it has caused a synchronous
+         * exception and we ignore the resulting signal, it will just
+         * generate the same exception over and over again and we get
+         * nowhere.  Better to kill it and let the kernel panic.
+         */
+        if (current->pid == 1) {
+                __sighandler_t handler;
+
+                spin_lock_irq(&current->sighand->siglock);
+                handler = current->sighand->action[signr-1].sa.sa_handler;
+                spin_unlock_irq(&current->sighand->siglock);
+                if (handler == SIG_DFL) {
+                        /* init has generated a synchronous exception
+                           and it doesn't have a handler for the signal */
+                        printk(KERN_CRIT "init has generated signal %d "
+                               "but has no handler for it\n", signr);
+                        do_exit(signr);
+                }
+        }
 }
 
 /*