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| author | Peter Zijlstra <peterz@infradead.org> | 2017-06-12 14:52:46 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-06-12 22:17:48 +0300 |
| commit | 8a524f803a3e0290cdba6d373361b2cef9752934 (patch) | |
| tree | 6de661f3898c330e2f7c418dae74e7363951d544 /arch/x86/include/asm/extable.h | |
| parent | 32c1431eea4881a6b17bd7c639315010aeefa452 (diff) | |
| download | linux-8a524f803a3e0290cdba6d373361b2cef9752934.tar.xz | |
x86/debug: Handle early WARN_ONs proper
Hans managed to trigger a WARN very early in the boot which killed his
(Virtual) box.
The reason is that the recent rework of WARN() to use UD0 forgot to add the
fixup_bug() call to early_fixup_exception(). As a result the kernel does
not handle the WARN_ON injected UD0 exception and panics.
Add the missing fixup call, so early UD's injected by WARN() get handled.
Fixes: 9a93848fe787 ("x86/debug: Implement __WARN() using UD0")
Reported-and-tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Frank Mehnert <frank.mehnert@oracle.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Michael Thayer <michael.thayer@oracle.com>
Link: http://lkml.kernel.org/r/20170612180108.w4vgu2ckucmllf3a@hirez.programming.kicks-ass.net
Diffstat (limited to 'arch/x86/include/asm/extable.h')
| -rw-r--r-- | arch/x86/include/asm/extable.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/extable.h b/arch/x86/include/asm/extable.h index b8ad261d11dc..c66d19e3c23e 100644 --- a/arch/x86/include/asm/extable.h +++ b/arch/x86/include/asm/extable.h @@ -29,6 +29,7 @@ struct pt_regs; } while (0) extern int fixup_exception(struct pt_regs *regs, int trapnr); +extern int fixup_bug(struct pt_regs *regs, int trapnr); extern bool ex_has_fault_handler(unsigned long ip); extern void early_fixup_exception(struct pt_regs *regs, int trapnr); |