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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
ARM: 8771/1: kprobes: Prohibit kprobes on do_undefinstr
Prohibit kprobes on do_undefinstr because kprobes on
arm is implemented by undefined instruction. This means
if we probe do_undefinstr(), it can cause infinit
recursive exception.
Fixes: 24ba613c9d6c ("ARM kprobes: core code")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
authored by Masami Hiramatsu and committed by Russell King eb0146da 70948c05
+4
-1
arch/arm/kernel/traps.c
+4
-1
arch/arm/kernel/traps.c
···
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#include <linux/uaccess.h>
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#include <linux/hardirq.h>
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#include <linux/kdebug.h>
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+
#include <linux/kprobes.h>
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#include <linux/module.h>
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#include <linux/kexec.h>
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#include <linux/bug.h>
···
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raw_spin_unlock_irqrestore(&undef_lock, flags);
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}
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-
static int call_undef_hook(struct pt_regs *regs, unsigned int instr)
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static nokprobe_inline
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int call_undef_hook(struct pt_regs *regs, unsigned int instr)
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{
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struct undef_hook *hook;
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unsigned long flags;
···
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arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6);
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}
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+
NOKPROBE_SYMBOL(do_undefinstr)
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/*
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* Handle FIQ similarly to NMI on x86 systems.