* BUG: unable to handle kernel NULL pointer dereference in rds_bind
@ 2019-09-16 13:29 syzbot
2019-09-16 16:49 ` Cong Wang
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2019-09-16 13:29 UTC (permalink / raw)
To: arvid.brodin, davem, linux-kernel, linux-rdma, netdev, rds-devel,
santosh.shilimkar, syzkaller-bugs, xiyou.wangcong
Hello,
syzbot found the following crash on:
HEAD commit: f4b752a6 mlx4: fix spelling mistake "veify" -> "verify"
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=16cbebe6600000
kernel config: https://syzkaller.appspot.com/x/.config?x=b89bb446a3faaba4
dashboard link: https://syzkaller.appspot.com/bug?extid=fae39afd2101a17ec624
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10753bc1600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=111dfc11600000
The bug was bisected to:
commit b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Thu Jul 4 00:21:13 2019 +0000
hsr: implement dellink to clean up resources
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11005fc1600000
final crash: https://syzkaller.appspot.com/x/report.txt?x=13005fc1600000
console output: https://syzkaller.appspot.com/x/log.txt?x=15005fc1600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+fae39afd2101a17ec624@syzkaller.appspotmail.com
Fixes: b9a1e627405d ("hsr: implement dellink to clean up resources")
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 9fef0067 P4D 9fef0067 PUD 9060d067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9884 Comm: syz-executor453 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8880a7c6fcd8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff8992bfe0 RCX: ffffffff86b9b636
RDX: 0000000000000000 RSI: ffff8880a7c6fd40 RDI: ffffffff897830c0
RBP: ffff8880a7c6fda8 R08: ffff888093150558 R09: 0000000000000000
R10: fffffbfff134af9f R11: ffff88809a008040 R12: ffff888093150080
R13: ffffffff897830c0 R14: 0000000000000000 R15: ffff8880a7c6fd40
FS: 000055555738a880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 000000008f04a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rds_bind+0x420/0x800 net/rds/bind.c:247
__sys_bind+0x239/0x290 net/socket.c:1647
__do_sys_bind net/socket.c:1658 [inline]
__se_sys_bind net/socket.c:1656 [inline]
__x64_sys_bind+0x73/0xb0 net/socket.c:1656
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4412b9
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc7c28b228 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412b9
RDX: 0000000000000010 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402030
R13: 00000000004020c0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
CR2: 0000000000000000
---[ end trace b47a1983319ea52a ]---
RIP: 0010:0x0
Code: Bad RIP value.
RSP: 0018:ffff8880a7c6fcd8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffff8992bfe0 RCX: ffffffff86b9b636
RDX: 0000000000000000 RSI: ffff8880a7c6fd40 RDI: ffffffff897830c0
RBP: ffff8880a7c6fda8 R08: ffff888093150558 R09: 0000000000000000
R10: fffffbfff134af9f R11: ffff88809a008040 R12: ffff888093150080
R13: ffffffff897830c0 R14: 0000000000000000 R15: ffff8880a7c6fd40
FS: 000055555738a880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004bf788 CR3: 000000008f04a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: BUG: unable to handle kernel NULL pointer dereference in rds_bind
2019-09-16 13:29 BUG: unable to handle kernel NULL pointer dereference in rds_bind syzbot
@ 2019-09-16 16:49 ` Cong Wang
2019-09-16 17:57 ` santosh.shilimkar
0 siblings, 1 reply; 3+ messages in thread
From: Cong Wang @ 2019-09-16 16:49 UTC (permalink / raw)
To: syzbot
Cc: Arvid Brodin, David Miller, LKML, linux-rdma,
Linux Kernel Network Developers, rds-devel, Santosh Shilimkar,
syzkaller-bugs
On Mon, Sep 16, 2019 at 6:29 AM syzbot
<syzbot+fae39afd2101a17ec624@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: f4b752a6 mlx4: fix spelling mistake "veify" -> "verify"
> git tree: net
> console output: https://syzkaller.appspot.com/x/log.txt?x=16cbebe6600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b89bb446a3faaba4
> dashboard link: https://syzkaller.appspot.com/bug?extid=fae39afd2101a17ec624
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10753bc1600000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=111dfc11600000
>
> The bug was bisected to:
>
> commit b9a1e627405d68d475a3c1f35e685ccfb5bbe668
> Author: Cong Wang <xiyou.wangcong@gmail.com>
> Date: Thu Jul 4 00:21:13 2019 +0000
>
> hsr: implement dellink to clean up resources
The crash has nothing to do with this commit. It is probably caused
by the lack of ->laddr_check in rds_loop_transport.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: BUG: unable to handle kernel NULL pointer dereference in rds_bind
2019-09-16 16:49 ` Cong Wang
@ 2019-09-16 17:57 ` santosh.shilimkar
0 siblings, 0 replies; 3+ messages in thread
From: santosh.shilimkar @ 2019-09-16 17:57 UTC (permalink / raw)
To: Cong Wang, syzbot
Cc: Arvid Brodin, David Miller, LKML, linux-rdma,
Linux Kernel Network Developers, rds-devel, syzkaller-bugs
On 9/16/19 9:49 AM, Cong Wang wrote:
> On Mon, Sep 16, 2019 at 6:29 AM syzbot
> <syzbot+fae39afd2101a17ec624@syzkaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit: f4b752a6 mlx4: fix spelling mistake "veify" -> "verify"
>> git tree: net
>> console output: https://syzkaller.appspot.com/x/log.txt?x=16cbebe6600000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=b89bb446a3faaba4
>> dashboard link: https://syzkaller.appspot.com/bug?extid=fae39afd2101a17ec624
>> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10753bc1600000
>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=111dfc11600000
>>
>> The bug was bisected to:
>>
>> commit b9a1e627405d68d475a3c1f35e685ccfb5bbe668
>> Author: Cong Wang <xiyou.wangcong@gmail.com>
>> Date: Thu Jul 4 00:21:13 2019 +0000
>>
>> hsr: implement dellink to clean up resources
>
>
> The crash has nothing to do with this commit. It is probably caused
> by the lack of ->laddr_check in rds_loop_transport.
>
Will have a look.
regards,
Santosh
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-09-16 13:29 BUG: unable to handle kernel NULL pointer dereference in rds_bind syzbot
2019-09-16 16:49 ` Cong Wang
2019-09-16 17:57 ` santosh.shilimkar
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