From 8a524f803a3e0290cdba6d373361b2cef9752934 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Mon, 12 Jun 2017 13:52:46 +0200 Subject: 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 Signed-off-by: Peter Zijlstra (Intel) Signed-off-by: Thomas Gleixner Cc: Linus Torvalds Cc: Frank Mehnert Cc: Hans de Goede Cc: Michael Thayer Link: http://lkml.kernel.org/r/20170612180108.w4vgu2ckucmllf3a@hirez.programming.kicks-ass.net --- arch/x86/kernel/traps.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/kernel') diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 3995d3a777d4..bf54309b85da 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -182,7 +182,7 @@ int is_valid_bugaddr(unsigned long addr) return ud == INSN_UD0 || ud == INSN_UD2; } -static int fixup_bug(struct pt_regs *regs, int trapnr) +int fixup_bug(struct pt_regs *regs, int trapnr) { if (trapnr != X86_TRAP_UD) return 0; -- cgit v1.2.3