To simplify the stacktrace with pt_regs from kretprobe handler,
set the correct return address to the instruction pointer in
the pt_regs before calling kretprobe handlers.
Suggested-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
kernel/kprobes.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 2550521ff64d..51d0057382a5 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1897,6 +1897,9 @@ unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs,
BUG_ON(1);
}
+ /* Set the instruction pointer to the correct address */
+ instruction_pointer_set(regs, correct_ret_addr);
+
/* Run them. */
first = current->kretprobe_instances.first;
while (first) {
