Am 12.08.2014 um 18:05 schrieb Steve Langasek:
> Control: reassign -1 gcc-4.9,nfs-kernel-server
> Control: found -1 nfs-kernel-server/1.2.8-8
> Control: found -1 gcc-4.9/4.9.1
>
> On Mon, Aug 11, 2014 at 12:54:00PM -0700, Petr Vandrovec wrote:
>> amd64. I think it affects all architectures. In case you want to
>> follow-up, attached is minimum testcase I could come up with. It
>> crashes with gcc-4.9 and -O2. No crash with gcc-4.8, or at -O1.
>
>> $gcc-4.9 -W -Wall -O2 client.c && ./a.out
>> Segmentation fault
>> $gcc-4.8 -W -Wall -O2 client.c && ./a.out
>> $gcc-4.9 -W -Wall -O1 client.c && ./a.out
>> $
>
> Thanks.
>
> Matthias, could you please have a look at the below test case? We have a
> regression in the latest nfs-kernel-server build, which appears to be caused
> by a gcc-4.9 bug.
>
> Should I work around this in nfs-utils, or is a quick fix possible in
> gcc-4.9?
>
>> char buf[100];
>>
>> void
>> add_name(char *old)
>> {
>> char *cp = old;
>>
>> while (cp && *cp) {
>> cp++;
>> }
if (old)
>> __builtin_strncpy(buf, old, cp-old);
>> if (cp != old) {
>> buf[0] = 'Q';
>> }
>> if (cp && *cp) {
>> buf[0] = 'Q';
>> }
>> }
>>
>> int main(void) {
>> add_name(0);
>> return 0;
>> }
guard the strncpy. I did see a similar issue like this (can't find it anymore),
and the recommendation was to guard the strncpy.
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