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

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Date:   Fri, 11 Mar 2022 18:30:05 -0000
From:   "tip-bot2 for Li Huafei" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Li Huafei <lihuafei1@...wei.com>, Borislav Petkov <bp@...e.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        <stable@...r.kernel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/traps: Mark do_int3() NOKPROBE_SYMBOL

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     a365a65f9ca1ceb9cf1ac29db4a4f51df7c507ad
Gitweb:        https://git.kernel.org/tip/a365a65f9ca1ceb9cf1ac29db4a4f51df7c507ad
Author:        Li Huafei <lihuafei1@...wei.com>
AuthorDate:    Thu, 10 Mar 2022 20:09:15 +08:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Fri, 11 Mar 2022 19:19:30 +01:00

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>
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
---
 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 c9d566d..8143693 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)
 {