Hello,
syzbot found the following crash on:
HEAD commit: 998d7551 Merge branch 'akpm' (patches from Andrew)
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1702db87600000
kernel config: https://syzkaller.appspot.com/x/.config?x=e0ac4d9b35046343
dashboard link: https://syzkaller.appspot.com/bug?extid=7dd2da51d8ae6f990403
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4256 Comm: kworker/u4:0 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:batadv_iv_ogm_queue_add+0x49/0x1120
net/batman-adv/bat_iv_ogm.c:605
Code: 48 89 75 b8 48 89 4d c0 4c 89 45 b0 44 89 4d d0 e8 fc 02 46 fa 48 8d
7b 03 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 18 0d 00 00
RSP: 0018:ffff88805d2cfb80 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888092284000
RDX: 0000000000000000 RSI: ffffffff872d1214 RDI: 0000000000000003
RBP: ffff88805d2cfc18 R08: ffff888092284000 R09: 0000000000000001
R10: ffffed100ba59f77 R11: 0000000000000003 R12: dffffc0000000000
R13: ffffed101245080e R14: ffff888092284000 R15: 0000000100051cf6
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200002c0 CR3: 00000000a421b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
batadv_iv_ogm_schedule+0xb0b/0xe50 net/batman-adv/bat_iv_ogm.c:813
batadv_iv_send_outstanding_bat_ogm_packet+0x580/0x760
net/batman-adv/bat_iv_ogm.c:1675
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 04d065842187c2b8 ]---
RIP: 0010:batadv_iv_ogm_queue_add+0x49/0x1120
net/batman-adv/bat_iv_ogm.c:605
Code: 48 89 75 b8 48 89 4d c0 4c 89 45 b0 44 89 4d d0 e8 fc 02 46 fa 48 8d
7b 03 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 18 0d 00 00
RSP: 0018:ffff88805d2cfb80 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888092284000
RDX: 0000000000000000 RSI: ffffffff872d1214 RDI: 0000000000000003
RBP: ffff88805d2cfc18 R08: ffff888092284000 R09: 0000000000000001
R10: ffffed100ba59f77 R11: 0000000000000003 R12: dffffc0000000000
R13: ffffed101245080e R14: ffff888092284000 R15: 0000000100051cf6
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200002c0 CR3: 00000000a421b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
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On Monday, 21 October 2019 07:21:06 CEST syzbot wrote:
[...]
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
>
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 4256 Comm: kworker/u4:0 Not tainted 5.4.0-rc3+ #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
> RIP: 0010:batadv_iv_ogm_queue_add+0x49/0x1120
> net/batman-adv/bat_iv_ogm.c:605
> Code: 48 89 75 b8 48 89 4d c0 4c 89 45 b0 44 89 4d d0 e8 fc 02 46 fa 48 8d
> 7b 03 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
> 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 18 0d 00 00
> RSP: 0018:ffff88805d2cfb80 EFLAGS: 00010246
> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888092284000
> RDX: 0000000000000000 RSI: ffffffff872d1214 RDI: 0000000000000003
> RBP: ffff88805d2cfc18 R08: ffff888092284000 R09: 0000000000000001
> R10: ffffed100ba59f77 R11: 0000000000000003 R12: dffffc0000000000
> R13: ffffed101245080e R14: ffff888092284000 R15: 0000000100051cf6
> FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000200002c0 CR3: 00000000a421b000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> batadv_iv_ogm_schedule+0xb0b/0xe50 net/batman-adv/bat_iv_ogm.c:813
> batadv_iv_send_outstanding_bat_ogm_packet+0x580/0x760
> net/batman-adv/bat_iv_ogm.c:1675
I am guessing that the fix for this is queued up since a while at
https://git.open-mesh.org/linux-merge.git/commit/40e220b4218bb3d278e5e8cc04ccdfd1c7ff8307
Kind regards,
Sven
On Mon, Oct 21, 2019 at 8:33 AM Sven Eckelmann <[email protected]> wrote:
>
> On Monday, 21 October 2019 07:21:06 CEST syzbot wrote:
> [...]
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email protected]
> >
> > kasan: CONFIG_KASAN_INLINE enabled
> > kasan: GPF could be caused by NULL-ptr deref or user memory access
> > general protection fault: 0000 [#1] PREEMPT SMP KASAN
> > CPU: 0 PID: 4256 Comm: kworker/u4:0 Not tainted 5.4.0-rc3+ #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
> > RIP: 0010:batadv_iv_ogm_queue_add+0x49/0x1120
> > net/batman-adv/bat_iv_ogm.c:605
> > Code: 48 89 75 b8 48 89 4d c0 4c 89 45 b0 44 89 4d d0 e8 fc 02 46 fa 48 8d
> > 7b 03 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48
> > 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 18 0d 00 00
> > RSP: 0018:ffff88805d2cfb80 EFLAGS: 00010246
> > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff888092284000
> > RDX: 0000000000000000 RSI: ffffffff872d1214 RDI: 0000000000000003
> > RBP: ffff88805d2cfc18 R08: ffff888092284000 R09: 0000000000000001
> > R10: ffffed100ba59f77 R11: 0000000000000003 R12: dffffc0000000000
> > R13: ffffed101245080e R14: ffff888092284000 R15: 0000000100051cf6
> > FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00000000200002c0 CR3: 00000000a421b000 CR4: 00000000001426f0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > Call Trace:
> > batadv_iv_ogm_schedule+0xb0b/0xe50 net/batman-adv/bat_iv_ogm.c:813
> > batadv_iv_send_outstanding_bat_ogm_packet+0x580/0x760
> > net/batman-adv/bat_iv_ogm.c:1675
>
> I am guessing that the fix for this is queued up since a while at
> https://git.open-mesh.org/linux-merge.git/commit/40e220b4218bb3d278e5e8cc04ccdfd1c7ff8307
>
> Kind regards,
> Sven
Hi Sven,
It was fixed based on another syzbot report, let's tell syzbot that
this is a dup of that other report than:
#syz dup: KASAN: use-after-free Read in batadv_iv_ogm_queue_add