diff options
Diffstat (limited to 'arch/arm/kernel/traps.c')
| -rw-r--r-- | arch/arm/kernel/traps.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 65bb762b2d80..5595fdd75e82 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -19,6 +19,7 @@ #include <linux/kallsyms.h> #include <linux/delay.h> #include <linux/init.h> +#include <linux/kprobes.h> #include <asm/atomic.h> #include <asm/cacheflush.h> @@ -313,6 +314,17 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs) get_user(instr, (u32 __user *)pc); } +#ifdef CONFIG_KPROBES + /* + * It is possible to have recursive kprobes, so we can't call + * the kprobe trap handler with the undef_lock held. + */ + if (instr == KPROBE_BREAKPOINT_INSTRUCTION && !user_mode(regs)) { + kprobe_trap_handler(regs, instr); + return; + } +#endif + spin_lock_irqsave(&undef_lock, flags); list_for_each_entry(hook, &undef_hook, node) { if ((instr & hook->instr_mask) == hook->instr_val && |
