linux-kernel - Re: fs/dlm/midcomms.c:913:22: sparse: sparse: restricted _

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <91901e7b-7d82-116c-aaf2-c74c6a6b999c@infradead.org>
Date:   Sat, 22 Jan 2022 11:18:52 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Alexander Aring <aahringo@...hat.com>,
        kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        David Teigland <teigland@...hat.com>,
        cluster-devel <cluster-devel@...hat.com>
Subject: Re: fs/dlm/midcomms.c:913:22: sparse: sparse: restricted __le32
 degrades to integer



On 1/22/22 10:28, Alexander Aring wrote:
> Hi,
> 
> On Fri, Jan 21, 2022 at 9:45 PM kernel test robot <lkp@...el.com> wrote:
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   9b57f458985742bd1c585f4c7f36d04634ce1143
>> commit: 658bd576f95ed597e519cdadf1c86ac87c17aea5 fs: dlm: move version conversion to compile time
>> date:   3 months ago
>> config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20220122/202201221028.YKA8kSdm-lkp@intel.com/config)
>> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
>> reproduce:
>>         # apt-get install sparse
>>         # sparse version: v0.6.4-dirty
>>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=658bd576f95ed597e519cdadf1c86ac87c17aea5
>>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>         git fetch --no-tags linus master
>>         git checkout 658bd576f95ed597e519cdadf1c86ac87c17aea5
>>         # save the config file to linux build tree
>>         mkdir build_dir
>>         make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash
>>
>> If you fix the issue, kindly add following tag as appropriate
> 
> I have it on my list but it isn't easy to make sparse happy here...
> this is the second time the robot reported this issue. Is there a way
> to turn the robot off in that case?
> 
> Maybe some human who reads that knows the answer?

Hi Alex,

In the source file, you can surround the "offending" line(s) with

#ifndef __CHECKER__
 ...
#endif

to prevent sparse from checking those lines.
Sometimes there needs to be an "#else" branch also.

'git grep __CHECKER__' will show you quite a few other examples.

kernel test robot might have a different way to disable this test
for a specific source file. I dunno.

-- 
~Randy