From: Borislav Petkov <bp@alien8.de>
To: kernel test robot <lkp@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
x86@kernel.org
Subject: Re: [tip:x86/cpu 2/3] arch/x86/kernel/alternative.c:96:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+10' is out of bounds.
Date: Tue, 16 Mar 2021 09:27:03 +0100 [thread overview]
Message-ID: <20210316082703.GA18003@zn.tnic> (raw)
In-Reply-To: <202103160701.3uXlWiWM-lkp@intel.com>
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@intel.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.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@alien8.de>
To: kbuild-all@lists.01.org
Subject: Re: [tip:x86/cpu 2/3] arch/x86/kernel/alternative.c:96:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+10' is out of bounds.
Date: Tue, 16 Mar 2021 09:27:03 +0100 [thread overview]
Message-ID: <20210316082703.GA18003@zn.tnic> (raw)
In-Reply-To: <202103160701.3uXlWiWM-lkp@intel.com>
[-- Attachment #1: Type: text/plain, Size: 1902 bytes --]
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@intel.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.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2021-03-16 8:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 23:50 [tip:x86/cpu 2/3] arch/x86/kernel/alternative.c:96:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+10' is out of bounds kernel test robot
2021-03-15 23:50 ` kernel test robot
2021-03-16 8:27 ` Borislav Petkov [this message]
2021-03-16 8:27 ` Borislav Petkov
2021-03-16 9:01 ` Peter Zijlstra
2021-03-16 9:01 ` Peter Zijlstra
2021-03-16 10:01 ` [kbuild-all] " Rong Chen
2021-03-16 10:01 ` Rong Chen
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