linux-kernel - [PATCH 5.16 117/121] x86/traps: Mark do_int3() NOKPROBE

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Message-Id: <20220314112747.377386421@linuxfoundation.org>
Date:   Mon, 14 Mar 2022 12:55:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Li Huafei <lihuafei1@...wei.com>,
        Borislav Petkov <bp@...e.de>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH 5.16 117/121] x86/traps: Mark do_int3() NOKPROBE_SYMBOL

From: Li Huafei <lihuafei1@...wei.com>

commit a365a65f9ca1ceb9cf1ac29db4a4f51df7c507ad upstream.

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>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20220310120915.63349-1-lihuafei1@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kernel/traps.c |    1 +
 1 file changed, 1 insertion(+)

--- 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)
 {