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Date: Fri, 19 Mar 2021 21:23:12 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...nel.org>
Cc: X86 ML <x86@...nel.org>, Masami Hiramatsu <mhiramat@...nel.org>,
Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, kuba@...nel.org, mingo@...hat.com,
ast@...nel.org, tglx@...utronix.de, kernel-team@...com, yhs@...com,
Josh Poimboeuf <jpoimboe@...hat.com>,
linux-ia64@...r.kernel.org
Subject: [PATCH -tip v3 08/11] kprobes: Setup instruction pointer in __kretprobe_trampoline_handler
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@...hat.com>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
Changes in v3:
- Cast the correct_ret_addr to unsigned long.
---
kernel/kprobes.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index cf19edc038e4..4ce3e6f5d28d 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1914,6 +1914,9 @@ unsigned long __kretprobe_trampoline_handler(struct pt_regs *regs,
BUG_ON(1);
}
+ /* Set the instruction pointer to the correct address */
+ instruction_pointer_set(regs, (unsigned long)correct_ret_addr);
+
/* Run them. */
first = current->kretprobe_instances.first;
while (first) {
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