general protection fault in fib6_add (2)

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syzbot

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Jan 2, 2018, 5:58:03 PM1/2/18
to da...@davemloft.net, kuz...@ms2.inr.ac.ru, linux-...@vger.kernel.org, net...@vger.kernel.org, syzkall...@googlegroups.com, yosh...@linux-ipv6.org
Hello,

syzkaller hit the following crash on
61233580f1f33c50e159c50e24d80ffd2ba2e06b
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0693ad...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.

audit: type=1400 audit(1514594846.496:7): avc: denied { map } for
pid=3201 comm="syzkaller001778" path="/root/syzkaller001778299" dev="sda1"
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
IPv6: Can't replace route, no match found
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3201 Comm: syzkaller001778 Not tainted 4.15.0-rc5+ #151
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244
RSP: 0018:ffff8801c7626a70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff84794465
RDX: 0000000000000004 RSI: ffff8801d38935f0 RDI: 0000000000000282
RBP: ffff8801c7626da0 R08: 1ffff10038ec4c35 R09: 0000000000000000
R10: ffff8801c7626c68 R11: 0000000000000000 R12: 00000000fffffffe
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009b70840
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020be1000 CR3: 00000001d585a006 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1006
ip6_route_multipath_add+0xd14/0x16c0 net/ipv6/route.c:3833
inet6_rtm_newroute+0xdc/0x160 net/ipv6/route.c:3957
rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411
netlink_rcv_skb+0x21e/0x460 net/netlink/af_netlink.c:2408
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423
netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1301
netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
sock_sendmsg_nosec net/socket.c:636 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:646
sock_write_iter+0x31a/0x5d0 net/socket.c:915
call_write_iter include/linux/fs.h:1772 [inline]
do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
do_iter_write+0x154/0x540 fs/read_write.c:932
compat_writev+0x225/0x420 fs/read_write.c:1246
do_compat_writev+0x115/0x220 fs/read_write.c:1267
C_SYSC_writev fs/read_write.c:1278 [inline]
compat_SyS_writev+0x26/0x30 fs/read_write.c:1274
do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f1fc79
RSP: 002b:00000000ffb61bfc EFLAGS: 00000203 ORIG_RAX: 0000000000000092
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204aaff0
RDX: 0000000000000001 RSI: 0000000000000167 RDI: 0000000000000010
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: f1 a9 f6 fc e8 2c f2 e2 fc 85 c0 0f 85 d5 03 00 00 49 8d 5e 20 e8 db
a9 f6 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00
0f 85 5a 0c 00 00 4d 39 ee 4d 8b 7e 20 0f 95 c0 4c
RIP: fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 RSP: ffff8801c7626a70
---[ end trace 956c65133fcfff88 ]---


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David Ahern

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Jan 3, 2018, 11:17:01 AM1/3/18
to syzbot, da...@davemloft.net, kuz...@ms2.inr.ac.ru, linux-...@vger.kernel.org, net...@vger.kernel.org, syzkall...@googlegroups.com, yosh...@linux-ipv6.org, wei...@google.com

Wei Wang

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Jan 3, 2018, 1:53:04 PM1/3/18
to David Ahern, syzbot, David S . Miller, Alexey Kuznetsov, lkml, Linux Kernel Network Developers, syzkall...@googlegroups.com, Hideaki YOSHIFUJI
pn could be NULL if fib6_add_1() failed. Will submit a fix for this.

Eric Biggers

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Jan 30, 2018, 8:16:48 PM1/30/18
to Wei Wang, David Ahern, syzbot, David S . Miller, Alexey Kuznetsov, lkml, Linux Kernel Network Developers, syzkall...@googlegroups.com, Hideaki YOSHIFUJI
On Wed, Jan 03, 2018 at 10:53:02AM -0800, 'Wei Wang' via syzkaller-bugs wrote:
> On Wed, Jan 3, 2018 at 8:16 AM, David Ahern <dsa...@gmail.com> wrote:
> > [ +wei...@google.com ]
> >
> > On 1/2/18 3:58 PM, syzbot wrote:
> >> Hello,
> >>
> >> syzkaller hit the following crash on
> >> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> >> compiler: gcc (GCC) 7.1.1 20170620
> >> .config is attached
> >> Raw console output is attached.
> >> C reproducer is attached
> >> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> >> for information about syzkaller reproducers
> >>
> >>
> >> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> >> Reported-by: syzbot+0693ad...@syzkaller.appspotmail.com
> >> It will help syzbot understand when the bug is fixed. See footer for
> >> details.
> >> If you forward the report, please keep this part and the footer.

This crash seemed to stop occurring around Jan 8. Wei, next time can you please
use the suggested Reported-by line so that syzbot knows which commit is meant to
fix the bug? I assume it was this one:

#syz fix: ipv6: fix general protection fault in fib6_add()

Thanks!

- Eric
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Wei Wang

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Jan 30, 2018, 8:43:14 PM1/30/18
to Eric Biggers, David Ahern, syzbot, David S . Miller, Alexey Kuznetsov, lkml, Linux Kernel Network Developers, syzkall...@googlegroups.com, Hideaki YOSHIFUJI
On Tue, Jan 30, 2018 at 5:16 PM, Eric Biggers <ebig...@gmail.com> wrote:
> On Wed, Jan 03, 2018 at 10:53:02AM -0800, 'Wei Wang' via syzkaller-bugs wrote:
>> On Wed, Jan 3, 2018 at 8:16 AM, David Ahern <dsa...@gmail.com> wrote:
>> > [ +wei...@google.com ]
>> >
>> > On 1/2/18 3:58 PM, syzbot wrote:
>> >> Hello,
>> >>
>> >> syzkaller hit the following crash on
>> >> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
>> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> >> compiler: gcc (GCC) 7.1.1 20170620
>> >> .config is attached
>> >> Raw console output is attached.
>> >> C reproducer is attached
>> >> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> >> for information about syzkaller reproducers
>> >>
>> >>
>> >> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> >> Reported-by: syzbot+0693ad...@syzkaller.appspotmail.com
>> >> It will help syzbot understand when the bug is fixed. See footer for
>> >> details.
>> >> If you forward the report, please keep this part and the footer.
>
> This crash seemed to stop occurring around Jan 8. Wei, next time can you please
> use the suggested Reported-by line so that syzbot knows which commit is meant to
> fix the bug? I assume it was this one:
Noted. Will do.

>
> #syz fix: ipv6: fix general protection fault in fib6_add()
>
Yes. Correct.
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