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authorMitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>2011-11-29 01:08:36 -0500
committerIngo Molnar <mingo@elte.hu>2011-12-05 05:37:47 -0500
commit55af77969fbd7a841838220ea2287432e0da8ae5 (patch)
treef5f819e160799fb0477ec33c06aa8d022466687d /arch/x86/kernel/irq_64.c
parent37fe6a42b3433b79a159ceb06a94cd1ef00e279d (diff)
x86: Panic on detection of stack overflow
Currently, messages are just output on the detection of stack overflow, which is not sufficient for systems that need a high reliability. This is because in general the overflow may corrupt data, and the additional corruption may occur due to reading them unless systems stop. This patch adds the sysctl parameter kernel.panic_on_stackoverflow and causes a panic when detecting the overflows of kernel, IRQ and exception stacks except user stack according to the parameter. It is disabled by default. Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com> Cc: yrl.pp-manager.tt@hitachi.com Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Link: http://lkml.kernel.org/r/20111129060836.11076.12323.stgit@ltc219.sdl.hitachi.co.jp Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/irq_64.c')
-rw-r--r--arch/x86/kernel/irq_64.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 928a7e909619..42552b0dce6a 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -26,6 +26,8 @@ EXPORT_PER_CPU_SYMBOL(irq_stat);
26DEFINE_PER_CPU(struct pt_regs *, irq_regs); 26DEFINE_PER_CPU(struct pt_regs *, irq_regs);
27EXPORT_PER_CPU_SYMBOL(irq_regs); 27EXPORT_PER_CPU_SYMBOL(irq_regs);
28 28
29int sysctl_panic_on_stackoverflow;
30
29/* 31/*
30 * Probabilistic stack overflow check: 32 * Probabilistic stack overflow check:
31 * 33 *
@@ -65,6 +67,9 @@ static inline void stack_overflow_check(struct pt_regs *regs)
65 current->comm, curbase, regs->sp, 67 current->comm, curbase, regs->sp,
66 irq_stack_top, irq_stack_bottom, 68 irq_stack_top, irq_stack_bottom,
67 estack_top, estack_bottom); 69 estack_top, estack_bottom);
70
71 if (sysctl_panic_on_stackoverflow)
72 panic("low stack detected by irq handler - check messages\n");
68#endif 73#endif
69} 74}
70 75