linux-kernel - Re: [PATCH] perf: enum overflow in uapi/linux/perf

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Fri, 7 Sep 2018 13:50:18 +0000
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] perf: enum overflow in uapi/linux/perf_event.h



On 09/07/2018 01:42 PM, Peter Zijlstra wrote:
> On Fri, Sep 07, 2018 at 01:27:19PM +0000, Christophe Leroy wrote:
>> On PPC32, enums are 32 bits, so __PERF_SAMPLE_CALLCHAIN_EARLY is
>> out of scope. The following sparse warning is encountered:
>>
>>    CHECK   arch/powerpc/kernel/process.c
>> ./include/uapi/linux/perf_event.h:147:56: warning: cast truncates bits from constant value (8000000000000000 becomes 0)
> 
> Urgh... what compiler is that? I've not seen anything like that from the
> build bots.
> 

[root@...6082vm linux-powerpc]# sparse --version
0.5.2

[root@...6082vm linux-powerpc]# ppc-linux-gcc --version
ppc-linux-gcc (GCC) 5.4.0