linux-kernel - Re: [kbuild-all] Re: [tip:x86/cpu 2/3] arch/x86/kernel/alternative.c:96:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+10' is out of bounds.

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Message-ID: <a7522586-6496-1b09-6d98-0682f0a60dce@intel.com>
Date:   Tue, 16 Mar 2021 18:01:37 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Borislav Petkov <bp@...en8.de>, kernel test robot <lkp@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [kbuild-all] Re: [tip:x86/cpu 2/3]
 arch/x86/kernel/alternative.c:96:10: warning: Undefined behaviour, pointer
 arithmetic 'x86nops+10' is out of bounds.



On 3/16/21 4:27 PM, Borislav Petkov wrote:
> Yet another useless report!
>
> On Tue, Mar 16, 2021 at 07:50:10AM +0800, kernel test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cpu
>> head:   301cddc21a157a3072d789a3097857202e550a24
>> commit: a89dfde3dc3c2dbf56910af75e2d8b11ec5308f6 [2/3] x86: Remove dynamic NOP selection
>> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>>
>> cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
> What's cppcheck?
>
> That?
>
> Description-en: tool for static C/C++ code analysis (CLI)
>   Cppcheck is a command-line tool that tries to detect bugs that your
>
>
>>>> arch/x86/kernel/alternative.c:96:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+10' is out of bounds. [pointerOutOfBounds]
>>      x86nops + 1 + 2 + 3 + 4,
>>              ^
>>     arch/x86/kernel/alternative.c:97:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+15' is out of bounds. [pointerOutOfBounds]
>>      x86nops + 1 + 2 + 3 + 4 + 5,
>>              ^
>>     arch/x86/kernel/alternative.c:98:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+21' is out of bounds. [pointerOutOfBounds]
>>      x86nops + 1 + 2 + 3 + 4 + 5 + 6,
>>              ^
>>     arch/x86/kernel/alternative.c:99:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+28' is out of bounds. [pointerOutOfBounds]
>>      x86nops + 1 + 2 + 3 + 4 + 5 + 6 + 7,
>>              ^
>>>> arch/x86/kernel/ftrace.c:304:7: warning: union member 'ftrace_op_code_union::code' is never used. [unusedStructMember]
>>      char code[OP_REF_SIZE];
>>           ^
> How do you trigger this?
>
> /me ignores it until there's some info on how those things can be
> reproduced.
>

Hi Borislav,

Sorry for the inconvenience, there's a bug in our system which sent 
internal reports to outside.
please ignore the warnings.

Best Regards,
Rong Chen