route(8) core dump, possible gcc(1) related
Alexander Kabaev
kabaev at gmail.com
Sun Dec 16 11:35:02 PST 2007
On Sun, 16 Dec 2007 21:27:17 +0300 (MSK)
Maxim Konovalov <maxim at macomnet.ru> wrote:
> Hello,
>
> gcc w/ default flags:
>
> # route add 172.19.16.0.0/16 10.10.10.2
> zsh: segmentation fault (core dumped)
>
> gcc -O0:
>
> # route add 172.19.16.0.0/16 10.10.10.2
> route: bad address: 172.19.16.0.0/16
>
> I failed to find any bugs in this code snippet where route(8)
> dumps a core (line 1041):
>
> 1033 q = strchr(s,'/');
> 1034 if (q && which == RTA_DST) {
> 1035 *q = '\0';
> 1036 if ((val = inet_network(s)) != INADDR_NONE) {
> 1037 inet_makenetandmask(
> 1038 val, &su->sin, strtoul(q+1,
> 0, 0)); 1039 return (0);
> 1040 }
> 1041 *q = '/';
> 1042 }
>
> Any comments?
>
Preliminary results show that inet_network from libc is somehow
thrashing $ebx even if it is not supposed to. -O0 disables value
caching in register and always allocates stack slot for the 'q'
pointer, so the problem is not visible.
Thanks for the test case, I'll look some more.
--
Alexander Kabaev
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