x86-64: honor notify_die() returning NOTIFY_STOP

This requires making die() return a value, making its callers honor
this (and be prepared that it may return), and making oops_end() have
two additional parameters.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 15 insertions, 8 deletions

diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c
index 1a12a81fdb1..cf90ceb48f5 100644
--- a/arch/x86/kernel/traps_64.c
+++ b/arch/x86/kernel/traps_64.c
@@ -488,7 +488,7 @@ unsigned __kprobes long oops_begin(void)
         return flags;
 }
 
-void __kprobes oops_end(unsigned long flags)
+void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
 { 
         die_owner = -1;
         bust_spinlocks(0);
@@ -497,12 +497,17 @@ void __kprobes oops_end(unsigned long flags)
                 /* Nest count reaches zero, release the lock. */
                 __raw_spin_unlock(&die_lock);
         raw_local_irq_restore(flags);
+        if (!regs) {
+                oops_exit();
+                return;
+        }
         if (panic_on_oops)
                 panic("Fatal exception");
         oops_exit();
+        do_exit(signr);
 }
 
-void __kprobes __die(const char * str, struct pt_regs * regs, long err)
+int __kprobes __die(const char * str, struct pt_regs * regs, long err)
 {
         static int die_counter;
         printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
@@ -516,7 +521,8 @@ void __kprobes __die(const char * str, struct pt_regs * regs, long err)
         printk("DEBUG_PAGEALLOC");
 #endif
         printk("\n");
-        notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
+        if (notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
+                return 1;
         show_registers(regs);
         add_taint(TAINT_DIE);
         /* Executive summary in case the oops scrolled away */
@@ -525,6 +531,7 @@ void __kprobes __die(const char * str, struct pt_regs * regs, long err)
         printk(" RSP <%016lx>\n", regs->sp);
         if (kexec_should_crash(current))
                 crash_kexec(regs);
+        return 0;
 }
 
 void die(const char * str, struct pt_regs * regs, long err)
@@ -534,9 +541,9 @@ void die(const char * str, struct pt_regs * regs, long err)
         if (!user_mode(regs))
                 report_bug(regs->ip, regs);
 
-        __die(str, regs, err);
-        oops_end(flags);
-        do_exit(SIGSEGV); 
+        if (__die(str, regs, err))
+                regs = NULL;
+        oops_end(flags, regs, SIGSEGV);
 }
 
 void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
@@ -553,10 +560,10 @@ void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
                 crash_kexec(regs);
         if (do_panic || panic_on_oops)
                 panic("Non maskable interrupt");
-        oops_end(flags);
+        oops_end(flags, NULL, SIGBUS);
         nmi_exit();
         local_irq_enable();
-        do_exit(SIGSEGV);
+        do_exit(SIGBUS);
 }
 
 static void __kprobes do_trap(int trapnr, int signr, char *str,