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-rw-r--r--arch/arm/kernel/traps.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 65bb762b2d8..5595fdd75e8 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 &&