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

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Date:   Fri, 11 Mar 2022 18:21:03 +0800
From:   Li Huafei <lihuafei1@...wei.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
CC:     <peterz@...radead.org>, <tglx@...utronix.de>,
        <alexandre.chartre@...cle.com>, <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: Re: [PATCH] x86/traps: Mark do_int3() NOKPROBE_SYMBOL


On 2022/3/10 22:04, Masami Hiramatsu wrote:
> On Thu, 10 Mar 2022 20:09:15 +0800
> Li Huafei <lihuafei1@...wei.com> wrote:
>
>> 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>
> Good catch!
> This should be backported to stable kernel.
>
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: stable@...r.kernel.org

Thanks,

Huafei

>
>
> Thank you,
>
>> ---
>>   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
>>
>