2013/6/8 Brian Haley <brian.ha...@hp.com>:
> On 06/07/2013 02:33 PM, Tommi Rantala wrote:
>> Hello,
>>
>> Hit this while fuzzing v3.10-rc4-214-g1612e11 (plus a one-liner
>> af_netlink patch from Patrick McHardy, that I hope is not related to
>> this bug).
>>
>> Tommi
>
>> [19491.615447] Call Trace:
>> [19491.616273] [<ffffffff81eb6243>] skb_push+0x33/0x40
>> [19491.617840] [<ffffffff81fc402c>] ip6_push_pending_frames+0x20c/0x4b0
>> [19491.619768] [<ffffffff81119c55>] ? local_bh_enable+0xc5/0xf0
>> [19491.621476] [<ffffffff81fdf650>] udp_v6_push_pending_frames+0x390/0x3a0
>> [19491.623475] [<ffffffff81119c55>] ? local_bh_enable+0xc5/0xf0
>> [19491.625236] [<ffffffff81fdf2c0>] ? compat_udpv6_setsockopt+0x30/0x30
>> [19491.627153] [<ffffffff81f60812>] udp_lib_setsockopt+0xc2/0x1d0
>> [19491.628965] [<ffffffff81fdf67d>] udpv6_setsockopt+0x1d/0x30
>> [19491.630674] [<ffffffff81eb33bf>] sock_common_setsockopt+0xf/0x20
>> [19491.632577] [<ffffffff81ead7e6>] SyS_setsockopt+0x96/0xe0
>> [19491.634376] [<ffffffff822a47a9>] system_call_fastpath+0x16/0x1b
>
> Does something as simple below crash? It at least tickles the code path from
> what I can tell.
Nope, no visible effect.
# strace ./i
execve("./i", ["./i"], [/* 14 vars */]) = 0
[...]
socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3
setsockopt(3, SOL_UDP, 1, [1], 4) = 0
sendto(3, "1234546789", 10, 0, {sa_family=AF_INET6,
sin6_port=htons(1234), inet_pton(AF_INET6, "::", &sin6_addr),
sin6_flowinfo=0, sin6_scope_id=0}, 28) = 10
setsockopt(3, SOL_UDP, 1, [0], 4) = 0
close(3) = 0
exit_group(0) = ?
+++ exited with 0 +++
> -Brian
>
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> #include <errno.h>
> #include <sys/socket.h>
> #include <netinet/in.h>
> #include <netinet/udp.h>
>
> main()
> {
> int s, cork, err, flags = 0;
> struct sockaddr_in6 sin6 = {0};
> char *buf = "1234546789";
>
> s = socket(AF_INET6, SOCK_DGRAM, 0);
> if (s < 0) {
> perror("socket");
> exit(1);
> }
>
> cork = 1;
> err = setsockopt(s, SOL_UDP, UDP_CORK, &cork, sizeof(cork));
> if (err < 0) {
> perror("setsockopt");
> goto out;
> }
>
> sin6.sin6_family = AF_INET6;
> sin6.sin6_port = htons(1234);
> err = sendto(s, buf, strlen(buf), flags,
> (const struct sockaddr *)&sin6,
> sizeof(sin6));
> if (err < 0) {
> perror("sendto");
> goto out;
> }
>
> cork = 0;
> err = setsockopt(s, SOL_UDP, UDP_CORK, &cork, sizeof(cork));
> if (err < 0)
> perror("setsockopt");
>
> out:
> close(s);
> exit(0);
> }
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