Hello,
syzbot found the following crash on:
HEAD commit: 459c5fb4 Merge branch 'mscc-PTP-support'
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13f2d33c600000
kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
dashboard link: https://syzkaller.appspot.com/bug?extid=eb349eeee854e389c36d
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111849e2600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1442c25a600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
------------[ cut here ]------------
kernel BUG at include/linux/skbuff.h:2225!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 9030 Comm: syz-executor649 Not tainted 5.3.0-rc3+ #134
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__skb_pull include/linux/skbuff.h:2225 [inline]
RIP: 0010:__skb_pull include/linux/skbuff.h:2222 [inline]
RIP: 0010:skb_pull_inline include/linux/skbuff.h:2231 [inline]
RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902
Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 9c e5 dd fb 4c 89 e0
5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 86 e5 dd fb <0f> 0b e8 df 13
18 fc e9 44 ff ff ff e8 d5 13 18 fc eb 8a e8 ee 13
RSP: 0018:ffff88808ac96e10 EFLAGS: 00010293
RAX: ffff88809c546000 RBX: 0000000000000004 RCX: ffffffff8594a3a6
RDX: 0000000000000000 RSI: ffffffff8594a3fa RDI: 0000000000000004
RBP: ffff88808ac96e30 R08: ffff88809c546000 R09: fffffbfff14a8f4f
R10: fffffbfff14a8f4e R11: ffffffff8a547a77 R12: 0000000095e28bcc
R13: ffff88808ac97478 R14: 00000000ffff8880 R15: ffff88808ac97478
FS: 0000555556549880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000100 CR3: 0000000089c3c000 CR4: 00000000001406f0
Call Trace:
sctp_inq_pop+0x2f1/0xd80 net/sctp/inqueue.c:202
sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:385
sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80
sctp_rcv+0x2807/0x3590 net/sctp/input.c:256
sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049
ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397
ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438
NF_HOOK include/linux/netfilter.h:305 [inline]
NF_HOOK include/linux/netfilter.h:299 [inline]
ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447
dst_input include/net/dst.h:442 [inline]
ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84
ip6_list_rcv_finish net/ipv6/ip6_input.c:118 [inline]
ip6_sublist_rcv+0x80c/0xcf0 net/ipv6/ip6_input.c:282
ipv6_list_rcv+0x373/0x4b0 net/ipv6/ip6_input.c:316
__netif_receive_skb_list_ptype net/core/dev.c:5049 [inline]
__netif_receive_skb_list_core+0x5fc/0x9d0 net/core/dev.c:5097
__netif_receive_skb_list net/core/dev.c:5149 [inline]
netif_receive_skb_list_internal+0x7eb/0xe60 net/core/dev.c:5244
gro_normal_list.part.0+0x1e/0xb0 net/core/dev.c:5757
gro_normal_list net/core/dev.c:5755 [inline]
gro_normal_one net/core/dev.c:5769 [inline]
napi_frags_finish net/core/dev.c:5782 [inline]
napi_gro_frags+0xa6a/0xea0 net/core/dev.c:5855
tun_get_user+0x2e98/0x3fa0 drivers/net/tun.c:1974
tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2020
call_write_iter include/linux/fs.h:1870 [inline]
do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693
do_iter_write fs/read_write.c:970 [inline]
do_iter_write+0x184/0x610 fs/read_write.c:951
vfs_writev+0x1b3/0x2f0 fs/read_write.c:1015
do_writev+0x15b/0x330 fs/read_write.c:1058
__do_sys_writev fs/read_write.c:1131 [inline]
__se_sys_writev fs/read_write.c:1128 [inline]
__x64_sys_writev+0x75/0xb0 fs/read_write.c:1128
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441b10
Code: 05 48 3d 01 f0 ff ff 0f 83 5d 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
00 66 90 83 3d 01 95 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 0f 83 34 09 fc ff c3 48 83 ec 08 e8 ba 2b 00 00
RSP: 002b:00007ffe63706b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007ffe63706ba0 RCX: 0000000000441b10
RDX: 0000000000000001 RSI: 00007ffe63706bd0 RDI: 00000000000000f0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000122cb
R13: 0000000000402960 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace c37566c1c02066db ]---
RIP: 0010:__skb_pull include/linux/skbuff.h:2225 [inline]
RIP: 0010:__skb_pull include/linux/skbuff.h:2222 [inline]
RIP: 0010:skb_pull_inline include/linux/skbuff.h:2231 [inline]
RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902
Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 9c e5 dd fb 4c 89 e0
5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 86 e5 dd fb <0f> 0b e8 df 13
18 fc e9 44 ff ff ff e8 d5 13 18 fc eb 8a e8 ee 13
RSP: 0018:ffff88808ac96e10 EFLAGS: 00010293
RAX: ffff88809c546000 RBX: 0000000000000004 RCX: ffffffff8594a3a6
RDX: 0000000000000000 RSI: ffffffff8594a3fa RDI: 0000000000000004
RBP: ffff88808ac96e30 R08: ffff88809c546000 R09: fffffbfff14a8f4f
R10: fffffbfff14a8f4e R11: ffffffff8a547a77 R12: 0000000095e28bcc
R13: ffff88808ac97478 R14: 00000000ffff8880 R15: ffff88808ac97478
FS: 0000555556549880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000100 CR3: 0000000089c3c000 CR4: 00000000001406f0
---
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 [email protected].
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
syzbot has bisected this bug to:
commit bc389fd101e57b36aacfaec2df8fe479eabb44ea
Author: David S. Miller <[email protected]>
Date: Tue Jul 2 21:12:30 2019 +0000
Merge branch 'macsec-fix-some-bugs-in-the-receive-path'
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=125c5c4c600000
start commit: 459c5fb4 Merge branch 'mscc-PTP-support'
git tree: net-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=115c5c4c600000
console output: https://syzkaller.appspot.com/x/log.txt?x=165c5c4c600000
kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
dashboard link: https://syzkaller.appspot.com/bug?extid=eb349eeee854e389c36d
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111849e2600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1442c25a600000
Reported-by: [email protected]
Fixes: bc389fd101e5 ("Merge
branch 'macsec-fix-some-bugs-in-the-receive-path'")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
On Sat, Aug 17, 2019 at 2:38 AM syzbot
<[email protected]> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 459c5fb4 Merge branch 'mscc-PTP-support'
> git tree: net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=13f2d33c600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
> dashboard link: https://syzkaller.appspot.com/bug?extid=eb349eeee854e389c36d
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111849e2600000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1442c25a600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
>
> ------------[ cut here ]------------
> kernel BUG at include/linux/skbuff.h:2225!
> invalid opcode: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 9030 Comm: syz-executor649 Not tainted 5.3.0-rc3+ #134
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__skb_pull include/linux/skbuff.h:2225 [inline]
> RIP: 0010:__skb_pull include/linux/skbuff.h:2222 [inline]
> RIP: 0010:skb_pull_inline include/linux/skbuff.h:2231 [inline]
> RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902
> Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 9c e5 dd fb 4c 89 e0
> 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 86 e5 dd fb <0f> 0b e8 df 13
> 18 fc e9 44 ff ff ff e8 d5 13 18 fc eb 8a e8 ee 13
> RSP: 0018:ffff88808ac96e10 EFLAGS: 00010293
> RAX: ffff88809c546000 RBX: 0000000000000004 RCX: ffffffff8594a3a6
> RDX: 0000000000000000 RSI: ffffffff8594a3fa RDI: 0000000000000004
> RBP: ffff88808ac96e30 R08: ffff88809c546000 R09: fffffbfff14a8f4f
> R10: fffffbfff14a8f4e R11: ffffffff8a547a77 R12: 0000000095e28bcc
> R13: ffff88808ac97478 R14: 00000000ffff8880 R15: ffff88808ac97478
> FS: 0000555556549880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000100 CR3: 0000000089c3c000 CR4: 00000000001406f0
> Call Trace:
> sctp_inq_pop+0x2f1/0xd80 net/sctp/inqueue.c:202
> sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:385
> sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80
> sctp_rcv+0x2807/0x3590 net/sctp/input.c:256
> sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049
> ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397
> ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438
> NF_HOOK include/linux/netfilter.h:305 [inline]
> NF_HOOK include/linux/netfilter.h:299 [inline]
> ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447
> dst_input include/net/dst.h:442 [inline]
> ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84
Looks skb_list_del_init() should be called in ip6_sublist_rcv_finish,
as does in ip_sublist_rcv_finish().
> ip6_list_rcv_finish net/ipv6/ip6_input.c:118 [inline]
> ip6_sublist_rcv+0x80c/0xcf0 net/ipv6/ip6_input.c:282
> ipv6_list_rcv+0x373/0x4b0 net/ipv6/ip6_input.c:316
> __netif_receive_skb_list_ptype net/core/dev.c:5049 [inline]
> __netif_receive_skb_list_core+0x5fc/0x9d0 net/core/dev.c:5097
> __netif_receive_skb_list net/core/dev.c:5149 [inline]
> netif_receive_skb_list_internal+0x7eb/0xe60 net/core/dev.c:5244
> gro_normal_list.part.0+0x1e/0xb0 net/core/dev.c:5757
> gro_normal_list net/core/dev.c:5755 [inline]
> gro_normal_one net/core/dev.c:5769 [inline]
> napi_frags_finish net/core/dev.c:5782 [inline]
> napi_gro_frags+0xa6a/0xea0 net/core/dev.c:5855
> tun_get_user+0x2e98/0x3fa0 drivers/net/tun.c:1974
> tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:2020
> call_write_iter include/linux/fs.h:1870 [inline]
> do_iter_readv_writev+0x5f8/0x8f0 fs/read_write.c:693
> do_iter_write fs/read_write.c:970 [inline]
> do_iter_write+0x184/0x610 fs/read_write.c:951
> vfs_writev+0x1b3/0x2f0 fs/read_write.c:1015
> do_writev+0x15b/0x330 fs/read_write.c:1058
> __do_sys_writev fs/read_write.c:1131 [inline]
> __se_sys_writev fs/read_write.c:1128 [inline]
> __x64_sys_writev+0x75/0xb0 fs/read_write.c:1128
> do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x441b10
> Code: 05 48 3d 01 f0 ff ff 0f 83 5d 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
> 00 66 90 83 3d 01 95 29 00 00 75 14 b8 14 00 00 00 0f 05 <48> 3d 01 f0 ff
> ff 0f 83 34 09 fc ff c3 48 83 ec 08 e8 ba 2b 00 00
> RSP: 002b:00007ffe63706b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
> RAX: ffffffffffffffda RBX: 00007ffe63706ba0 RCX: 0000000000441b10
> RDX: 0000000000000001 RSI: 00007ffe63706bd0 RDI: 00000000000000f0
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000004
> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000122cb
> R13: 0000000000402960 R14: 0000000000000000 R15: 0000000000000000
> Modules linked in:
> ---[ end trace c37566c1c02066db ]---
> RIP: 0010:__skb_pull include/linux/skbuff.h:2225 [inline]
> RIP: 0010:__skb_pull include/linux/skbuff.h:2222 [inline]
> RIP: 0010:skb_pull_inline include/linux/skbuff.h:2231 [inline]
> RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902
> Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 9c e5 dd fb 4c 89 e0
> 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 86 e5 dd fb <0f> 0b e8 df 13
> 18 fc e9 44 ff ff ff e8 d5 13 18 fc eb 8a e8 ee 13
> RSP: 0018:ffff88808ac96e10 EFLAGS: 00010293
> RAX: ffff88809c546000 RBX: 0000000000000004 RCX: ffffffff8594a3a6
> RDX: 0000000000000000 RSI: ffffffff8594a3fa RDI: 0000000000000004
> RBP: ffff88808ac96e30 R08: ffff88809c546000 R09: fffffbfff14a8f4f
> R10: fffffbfff14a8f4e R11: ffffffff8a547a77 R12: 0000000095e28bcc
> R13: ffff88808ac97478 R14: 00000000ffff8880 R15: ffff88808ac97478
> FS: 0000555556549880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000100 CR3: 0000000089c3c000 CR4: 00000000001406f0
>
>
> ---
> 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 [email protected].
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
On Sun, Aug 18, 2019 at 7:07 AM Xin Long <[email protected]> wrote:
>
> On Sat, Aug 17, 2019 at 2:38 AM syzbot
> <[email protected]> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: 459c5fb4 Merge branch 'mscc-PTP-support'
> > git tree: net-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=13f2d33c600000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
> > dashboard link: https://syzkaller.appspot.com/bug?extid=eb349eeee854e389c36d
> > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111849e2600000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1442c25a600000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email protected]
> >
> > ------------[ cut here ]------------
> > kernel BUG at include/linux/skbuff.h:2225!
> > invalid opcode: 0000 [#1] PREEMPT SMP KASAN
> > CPU: 0 PID: 9030 Comm: syz-executor649 Not tainted 5.3.0-rc3+ #134
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > RIP: 0010:__skb_pull include/linux/skbuff.h:2225 [inline]
> > RIP: 0010:__skb_pull include/linux/skbuff.h:2222 [inline]
> > RIP: 0010:skb_pull_inline include/linux/skbuff.h:2231 [inline]
> > RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902
> > Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 9c e5 dd fb 4c 89 e0
> > 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 86 e5 dd fb <0f> 0b e8 df 13
> > 18 fc e9 44 ff ff ff e8 d5 13 18 fc eb 8a e8 ee 13
> > RSP: 0018:ffff88808ac96e10 EFLAGS: 00010293
> > RAX: ffff88809c546000 RBX: 0000000000000004 RCX: ffffffff8594a3a6
> > RDX: 0000000000000000 RSI: ffffffff8594a3fa RDI: 0000000000000004
> > RBP: ffff88808ac96e30 R08: ffff88809c546000 R09: fffffbfff14a8f4f
> > R10: fffffbfff14a8f4e R11: ffffffff8a547a77 R12: 0000000095e28bcc
> > R13: ffff88808ac97478 R14: 00000000ffff8880 R15: ffff88808ac97478
> > FS: 0000555556549880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 0000000020000100 CR3: 0000000089c3c000 CR4: 00000000001406f0
> > Call Trace:
> > sctp_inq_pop+0x2f1/0xd80 net/sctp/inqueue.c:202
> > sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:385
> > sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80
> > sctp_rcv+0x2807/0x3590 net/sctp/input.c:256
> > sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049
> > ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397
> > ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438
> > NF_HOOK include/linux/netfilter.h:305 [inline]
> > NF_HOOK include/linux/netfilter.h:299 [inline]
> > ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447
> > dst_input include/net/dst.h:442 [inline]
> > ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84
> Looks skb_list_del_init() should be called in ip6_sublist_rcv_finish,
> as does in ip_sublist_rcv_finish().
This was recently introduced, right? Only in net-next and linux-next.
Otherwise, is it a remote DoS? If so and if it's present in any
releases, may need a CVE.
On Sun, Aug 18, 2019 at 10:13 PM Dmitry Vyukov <[email protected]> wrote:
>
> On Sun, Aug 18, 2019 at 7:07 AM Xin Long <[email protected]> wrote:
> >
> > On Sat, Aug 17, 2019 at 2:38 AM syzbot
> > <[email protected]> wrote:
> > >
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: 459c5fb4 Merge branch 'mscc-PTP-support'
> > > git tree: net-next
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=13f2d33c600000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=eb349eeee854e389c36d
> > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111849e2600000
> > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1442c25a600000
> > >
> > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > Reported-by: [email protected]
> > >
> > > ------------[ cut here ]------------
> > > kernel BUG at include/linux/skbuff.h:2225!
> > > invalid opcode: 0000 [#1] PREEMPT SMP KASAN
> > > CPU: 0 PID: 9030 Comm: syz-executor649 Not tainted 5.3.0-rc3+ #134
> > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > > Google 01/01/2011
> > > RIP: 0010:__skb_pull include/linux/skbuff.h:2225 [inline]
> > > RIP: 0010:__skb_pull include/linux/skbuff.h:2222 [inline]
> > > RIP: 0010:skb_pull_inline include/linux/skbuff.h:2231 [inline]
> > > RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902
> > > Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 9c e5 dd fb 4c 89 e0
> > > 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 86 e5 dd fb <0f> 0b e8 df 13
> > > 18 fc e9 44 ff ff ff e8 d5 13 18 fc eb 8a e8 ee 13
> > > RSP: 0018:ffff88808ac96e10 EFLAGS: 00010293
> > > RAX: ffff88809c546000 RBX: 0000000000000004 RCX: ffffffff8594a3a6
> > > RDX: 0000000000000000 RSI: ffffffff8594a3fa RDI: 0000000000000004
> > > RBP: ffff88808ac96e30 R08: ffff88809c546000 R09: fffffbfff14a8f4f
> > > R10: fffffbfff14a8f4e R11: ffffffff8a547a77 R12: 0000000095e28bcc
> > > R13: ffff88808ac97478 R14: 00000000ffff8880 R15: ffff88808ac97478
> > > FS: 0000555556549880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > CR2: 0000000020000100 CR3: 0000000089c3c000 CR4: 00000000001406f0
> > > Call Trace:
> > > sctp_inq_pop+0x2f1/0xd80 net/sctp/inqueue.c:202
> > > sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:385
> > > sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80
> > > sctp_rcv+0x2807/0x3590 net/sctp/input.c:256
> > > sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049
> > > ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397
> > > ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438
> > > NF_HOOK include/linux/netfilter.h:305 [inline]
> > > NF_HOOK include/linux/netfilter.h:299 [inline]
> > > ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447
> > > dst_input include/net/dst.h:442 [inline]
> > > ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84
> > Looks skb_list_del_init() should be called in ip6_sublist_rcv_finish,
> > as does in ip_sublist_rcv_finish().
>
> This was recently introduced, right? Only in net-next and linux-next.
> Otherwise, is it a remote DoS? If so and if it's present in any
> releases, may need a CVE.
I need to reproduce and confirm it, will let you know.
On Mon, Aug 19, 2019 at 10:44 PM Xin Long <[email protected]> wrote:
>
> On Sun, Aug 18, 2019 at 10:13 PM Dmitry Vyukov <[email protected]> wrote:
> >
> > On Sun, Aug 18, 2019 at 7:07 AM Xin Long <[email protected]> wrote:
> > >
> > > On Sat, Aug 17, 2019 at 2:38 AM syzbot
> > > <[email protected]> wrote:
> > > >
> > > > Hello,
> > > >
> > > > syzbot found the following crash on:
> > > >
> > > > HEAD commit: 459c5fb4 Merge branch 'mscc-PTP-support'
> > > > git tree: net-next
> > > > console output: https://syzkaller.appspot.com/x/log.txt?x=13f2d33c600000
> > > > kernel config: https://syzkaller.appspot.com/x/.config?x=d4cf1ffb87d590d7
> > > > dashboard link: https://syzkaller.appspot.com/bug?extid=eb349eeee854e389c36d
> > > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111849e2600000
> > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1442c25a600000
> > > >
> > > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > > Reported-by: [email protected]
> > > >
> > > > ------------[ cut here ]------------
> > > > kernel BUG at include/linux/skbuff.h:2225!
> > > > invalid opcode: 0000 [#1] PREEMPT SMP KASAN
> > > > CPU: 0 PID: 9030 Comm: syz-executor649 Not tainted 5.3.0-rc3+ #134
> > > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > > > Google 01/01/2011
> > > > RIP: 0010:__skb_pull include/linux/skbuff.h:2225 [inline]
> > > > RIP: 0010:__skb_pull include/linux/skbuff.h:2222 [inline]
> > > > RIP: 0010:skb_pull_inline include/linux/skbuff.h:2231 [inline]
> > > > RIP: 0010:skb_pull+0xea/0x110 net/core/skbuff.c:1902
> > > > Code: 9d c8 00 00 00 49 89 dc 49 89 9d c8 00 00 00 e8 9c e5 dd fb 4c 89 e0
> > > > 5b 41 5c 41 5d 41 5e 5d c3 45 31 e4 eb ea e8 86 e5 dd fb <0f> 0b e8 df 13
> > > > 18 fc e9 44 ff ff ff e8 d5 13 18 fc eb 8a e8 ee 13
> > > > RSP: 0018:ffff88808ac96e10 EFLAGS: 00010293
> > > > RAX: ffff88809c546000 RBX: 0000000000000004 RCX: ffffffff8594a3a6
> > > > RDX: 0000000000000000 RSI: ffffffff8594a3fa RDI: 0000000000000004
> > > > RBP: ffff88808ac96e30 R08: ffff88809c546000 R09: fffffbfff14a8f4f
> > > > R10: fffffbfff14a8f4e R11: ffffffff8a547a77 R12: 0000000095e28bcc
> > > > R13: ffff88808ac97478 R14: 00000000ffff8880 R15: ffff88808ac97478
> > > > FS: 0000555556549880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
> > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > > CR2: 0000000020000100 CR3: 0000000089c3c000 CR4: 00000000001406f0
> > > > Call Trace:
> > > > sctp_inq_pop+0x2f1/0xd80 net/sctp/inqueue.c:202
> > > > sctp_endpoint_bh_rcv+0x184/0x8d0 net/sctp/endpointola.c:385
> > > > sctp_inq_push+0x1e4/0x280 net/sctp/inqueue.c:80
> > > > sctp_rcv+0x2807/0x3590 net/sctp/input.c:256
> > > > sctp6_rcv+0x17/0x30 net/sctp/ipv6.c:1049
> > > > ip6_protocol_deliver_rcu+0x2fe/0x1660 net/ipv6/ip6_input.c:397
> > > > ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:438
> > > > NF_HOOK include/linux/netfilter.h:305 [inline]
> > > > NF_HOOK include/linux/netfilter.h:299 [inline]
> > > > ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:447
> > > > dst_input include/net/dst.h:442 [inline]
> > > > ip6_sublist_rcv_finish+0x98/0x1e0 net/ipv6/ip6_input.c:84
> > > Looks skb_list_del_init() should be called in ip6_sublist_rcv_finish,
> > > as does in ip_sublist_rcv_finish().
> >
> > This was recently introduced, right? Only in net-next and linux-next.
> > Otherwise, is it a remote DoS? If so and if it's present in any
> > releases, may need a CVE.
> I need to reproduce and confirm it, will let you know.
The panic could be triggered since the listified RX support for
GRO_NORMAL skbs:
https://patchwork.ozlabs.org/cover/1142808/
(it's only in net-next now, I will post a fix soon)
But the bug itself is not really related with the patch series above.
the issue here is pretty much like what this patch fixed:
https://patchwork.ozlabs.org/patch/942541/
I didn't see a CVE for it, maybe because it was only on net-next too.