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Message-Id: <0805aec810b8eb17f03b0ba63e4b916c8a0aba27.1511195781.git.luto@kernel.org>
Date: Mon, 20 Nov 2017 09:07:46 -0800
From: Andy Lutomirski <luto@...nel.org>
To: X86 ML <x86@...nel.org>
Cc: Borislav Petkov <bpetkov@...e.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Brian Gerst <brgerst@...il.com>,
Dave Hansen <dave.hansen@...el.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 15/16] x86/irq/64: In the stack overflow warning, print the offending IP
In case something goes wrong with unwind (not unlikely in case of
overflow), print the offending IP where we detected the overflow.
---
arch/x86/kernel/irq_64.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 020efbf5786b..d86e344f5b3d 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -57,10 +57,10 @@ static inline void stack_overflow_check(struct pt_regs *regs)
if (regs->sp >= estack_top && regs->sp <= estack_bottom)
return;
- WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx)\n",
+ WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx,ip:%pF)\n",
current->comm, curbase, regs->sp,
irq_stack_top, irq_stack_bottom,
- estack_top, estack_bottom);
+ estack_top, estack_bottom, (void *)regs->ip);
if (sysctl_panic_on_stackoverflow)
panic("low stack detected by irq handler - check messages\n");
--
2.13.6
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