linux-kernel - [PATCH] x86/traps: Mark do_int3() NOKPROBE

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Date:   Thu, 10 Mar 2022 20:09:15 +0800
From:   Li Huafei <lihuafei1@...wei.com>
To:     <peterz@...radead.org>, <tglx@...utronix.de>
CC:     <alexandre.chartre@...cle.com>, <mhiramat@...nel.org>,
        <mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>,
        <x86@...nel.org>, <hpa@...or.com>, <laijs@...ux.alibaba.com>,
        <chang.seok.bae@...el.com>, <fenghua.yu@...el.com>,
        <thomas.tai@...cle.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/traps: Mark do_int3() NOKPROBE_SYMBOL

Since kprobe_int3_handler() is called in do_int3(), probing do_int3()
can cause a breakpoint recursion and crash the kernel. Therefore,
do_int3() should be marked as NOKPROBE_SYMBOL.

Fixes: 21e28290b317 ("x86/traps: Split int3 handler up")
Signed-off-by: Li Huafei <lihuafei1@...wei.com>
---
 arch/x86/kernel/traps.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index c9d566dcf89a..8143693a7ea6 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -659,6 +659,7 @@ static bool do_int3(struct pt_regs *regs)
 
 	return res == NOTIFY_STOP;
 }
+NOKPROBE_SYMBOL(do_int3);
 
 static void do_int3_user(struct pt_regs *regs)
 {
-- 
2.17.1