* [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2)
@ 2024-04-18 7:05 syzbot
2024-04-18 7:19 ` Eric Dumazet
2024-04-22 16:07 ` Kuniyuki Iwashima
0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2024-04-18 7:05 UTC (permalink / raw)
To: davem, edumazet, kuba, linux-kernel, netdev, pabeni, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: f2e367d6ad3b Merge tag 'for-6.8/dm-fix-3' of git://git.ker..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=144a8d4a180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472
dashboard link: https://syzkaller.appspot.com/bug?extid=42a0dc856239de4de60e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=149caa54180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bb8e22180000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0dabc03369d1/disk-f2e367d6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/240ca250d398/vmlinux-f2e367d6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cc38bcdb48c9/bzImage-f2e367d6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
BUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
BUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222
__netdev_start_xmit include/linux/netdevice.h:4989 [inline]
netdev_start_xmit include/linux/netdevice.h:5003 [inline]
xmit_one net/core/dev.c:3547 [inline]
dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563
__dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3081 [inline]
packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x735/0xa10 net/socket.c:2191
__do_sys_sendto net/socket.c:2203 [inline]
__se_sys_sendto net/socket.c:2199 [inline]
__x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Uninit was created at:
slab_post_alloc_hook mm/slub.c:3819 [inline]
slab_alloc_node mm/slub.c:3860 [inline]
__do_kmalloc_node mm/slub.c:3980 [inline]
__kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001
kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582
__alloc_skb+0x352/0x790 net/core/skbuff.c:651
skb_segment+0x20aa/0x7080 net/core/skbuff.c:4647
udp6_ufo_fragment+0xcab/0x1150 net/ipv6/udp_offload.c:109
ipv6_gso_segment+0x14be/0x2ca0 net/ipv6/ip6_offload.c:152
skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
nsh_gso_segment+0x6f4/0xf70 net/nsh/nsh.c:108
skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
__skb_gso_segment+0x4b0/0x730 net/core/gso.c:124
skb_gso_segment include/net/gso.h:83 [inline]
validate_xmit_skb+0x107f/0x1930 net/core/dev.c:3628
__dev_queue_xmit+0x1f28/0x51c0 net/core/dev.c:4343
dev_queue_xmit include/linux/netdevice.h:3171 [inline]
packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3081 [inline]
packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x735/0xa10 net/socket.c:2191
__do_sys_sendto net/socket.c:2203 [inline]
__se_sys_sendto net/socket.c:2199 [inline]
__x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
CPU: 1 PID: 5101 Comm: syz-executor421 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2)
2024-04-18 7:05 [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2) syzbot
@ 2024-04-18 7:19 ` Eric Dumazet
2024-04-18 17:07 ` Kuniyuki Iwashima
2024-04-22 16:07 ` Kuniyuki Iwashima
1 sibling, 1 reply; 5+ messages in thread
From: Eric Dumazet @ 2024-04-18 7:19 UTC (permalink / raw)
To: syzbot, Kuniyuki Iwashima
Cc: davem, kuba, linux-kernel, netdev, pabeni, syzkaller-bugs
On Thu, Apr 18, 2024 at 9:05 AM syzbot
<syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: f2e367d6ad3b Merge tag 'for-6.8/dm-fix-3' of git://git.ker..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=144a8d4a180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472
> dashboard link: https://syzkaller.appspot.com/bug?extid=42a0dc856239de4de60e
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=149caa54180000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bb8e22180000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/0dabc03369d1/disk-f2e367d6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/240ca250d398/vmlinux-f2e367d6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/cc38bcdb48c9/bzImage-f2e367d6.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com
>
> =====================================================
> BUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
> BUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
> BUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
> ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
> ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
> ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
> ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222
> __netdev_start_xmit include/linux/netdevice.h:4989 [inline]
> netdev_start_xmit include/linux/netdevice.h:5003 [inline]
> xmit_one net/core/dev.c:3547 [inline]
> dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563
> __dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351
> dev_queue_xmit include/linux/netdevice.h:3171 [inline]
> packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
> packet_snd net/packet/af_packet.c:3081 [inline]
> packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
> sock_sendmsg_nosec net/socket.c:730 [inline]
> __sock_sendmsg net/socket.c:745 [inline]
> __sys_sendto+0x735/0xa10 net/socket.c:2191
> __do_sys_sendto net/socket.c:2203 [inline]
> __se_sys_sendto net/socket.c:2199 [inline]
> __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was created at:
> slab_post_alloc_hook mm/slub.c:3819 [inline]
> slab_alloc_node mm/slub.c:3860 [inline]
> __do_kmalloc_node mm/slub.c:3980 [inline]
> __kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001
> kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582
> __alloc_skb+0x352/0x790 net/core/skbuff.c:651
> skb_segment+0x20aa/0x7080 net/core/skbuff.c:4647
> udp6_ufo_fragment+0xcab/0x1150 net/ipv6/udp_offload.c:109
> ipv6_gso_segment+0x14be/0x2ca0 net/ipv6/ip6_offload.c:152
> skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
> nsh_gso_segment+0x6f4/0xf70 net/nsh/nsh.c:108
> skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
> __skb_gso_segment+0x4b0/0x730 net/core/gso.c:124
> skb_gso_segment include/net/gso.h:83 [inline]
> validate_xmit_skb+0x107f/0x1930 net/core/dev.c:3628
> __dev_queue_xmit+0x1f28/0x51c0 net/core/dev.c:4343
> dev_queue_xmit include/linux/netdevice.h:3171 [inline]
> packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
> packet_snd net/packet/af_packet.c:3081 [inline]
> packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
> sock_sendmsg_nosec net/socket.c:730 [inline]
> __sock_sendmsg net/socket.c:745 [inline]
> __sys_sendto+0x735/0xa10 net/socket.c:2191
> __do_sys_sendto net/socket.c:2203 [inline]
> __se_sys_sendto net/socket.c:2199 [inline]
> __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> CPU: 1 PID: 5101 Comm: syz-executor421 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
> =====================================================
>
>
> ---
> This report 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 issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
Cc Kuniyuki Iwashima
This is the syzbot bug I mentioned earlier to you.
Thanks !
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2)
2024-04-18 7:19 ` Eric Dumazet
@ 2024-04-18 17:07 ` Kuniyuki Iwashima
0 siblings, 0 replies; 5+ messages in thread
From: Kuniyuki Iwashima @ 2024-04-18 17:07 UTC (permalink / raw)
To: edumazet
Cc: davem, kuba, kuniyu, linux-kernel, netdev, pabeni,
syzbot+42a0dc856239de4de60e, syzkaller-bugs
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 18 Apr 2024 09:19:20 +0200
> On Thu, Apr 18, 2024 at 9:05 AM syzbot
> <syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: f2e367d6ad3b Merge tag 'for-6.8/dm-fix-3' of git://git.ker..
> > git tree: upstream
> > console+strace: https://syzkaller.appspot.com/x/log.txt?x=144a8d4a180000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472
> > dashboard link: https://syzkaller.appspot.com/bug?extid=42a0dc856239de4de60e
> > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=149caa54180000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bb8e22180000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/0dabc03369d1/disk-f2e367d6.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/240ca250d398/vmlinux-f2e367d6.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/cc38bcdb48c9/bzImage-f2e367d6.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com
> >
> > =====================================================
> > BUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
> > BUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
> > BUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
> > ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
> > ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
> > ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
> > ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222
> > __netdev_start_xmit include/linux/netdevice.h:4989 [inline]
> > netdev_start_xmit include/linux/netdevice.h:5003 [inline]
> > xmit_one net/core/dev.c:3547 [inline]
> > dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563
> > __dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351
> > dev_queue_xmit include/linux/netdevice.h:3171 [inline]
> > packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
> > packet_snd net/packet/af_packet.c:3081 [inline]
> > packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
> > sock_sendmsg_nosec net/socket.c:730 [inline]
> > __sock_sendmsg net/socket.c:745 [inline]
> > __sys_sendto+0x735/0xa10 net/socket.c:2191
> > __do_sys_sendto net/socket.c:2203 [inline]
> > __se_sys_sendto net/socket.c:2199 [inline]
> > __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> > do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> > entry_SYSCALL_64_after_hwframe+0x63/0x6b
> >
> > Uninit was created at:
> > slab_post_alloc_hook mm/slub.c:3819 [inline]
> > slab_alloc_node mm/slub.c:3860 [inline]
> > __do_kmalloc_node mm/slub.c:3980 [inline]
> > __kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001
> > kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582
> > __alloc_skb+0x352/0x790 net/core/skbuff.c:651
> > skb_segment+0x20aa/0x7080 net/core/skbuff.c:4647
> > udp6_ufo_fragment+0xcab/0x1150 net/ipv6/udp_offload.c:109
> > ipv6_gso_segment+0x14be/0x2ca0 net/ipv6/ip6_offload.c:152
> > skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
> > nsh_gso_segment+0x6f4/0xf70 net/nsh/nsh.c:108
> > skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
> > __skb_gso_segment+0x4b0/0x730 net/core/gso.c:124
> > skb_gso_segment include/net/gso.h:83 [inline]
> > validate_xmit_skb+0x107f/0x1930 net/core/dev.c:3628
> > __dev_queue_xmit+0x1f28/0x51c0 net/core/dev.c:4343
> > dev_queue_xmit include/linux/netdevice.h:3171 [inline]
> > packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
> > packet_snd net/packet/af_packet.c:3081 [inline]
> > packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
> > sock_sendmsg_nosec net/socket.c:730 [inline]
> > __sock_sendmsg net/socket.c:745 [inline]
> > __sys_sendto+0x735/0xa10 net/socket.c:2191
> > __do_sys_sendto net/socket.c:2203 [inline]
> > __se_sys_sendto net/socket.c:2199 [inline]
> > __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
> > do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> > do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> > entry_SYSCALL_64_after_hwframe+0x63/0x6b
> >
> > CPU: 1 PID: 5101 Comm: syz-executor421 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
> > =====================================================
> >
> >
> > ---
> > This report 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 issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >
> > If the report is already addressed, let syzbot know by replying with:
> > #syz fix: exact-commit-title
> >
> > If you want syzbot to run the reproducer, reply with:
> > #syz test: git://repo/address.git branch-or-commit-hash
> > If you attach or paste a git patch, syzbot will apply it before testing.
> >
> > If you want to overwrite report's subsystems, reply with:
> > #syz set subsystems: new-subsystem
> > (See the list of subsystem names on the web dashboard)
> >
> > If the report is a duplicate of another one, reply with:
> > #syz dup: exact-subject-of-another-report
> >
> > If you want to undo deduplication, reply with:
> > #syz undup
>
> Cc Kuniyuki Iwashima
>
> This is the syzbot bug I mentioned earlier to you.
Will look into it.
Thanks!
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2)
2024-04-18 7:05 [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2) syzbot
2024-04-18 7:19 ` Eric Dumazet
@ 2024-04-22 16:07 ` Kuniyuki Iwashima
2024-04-23 1:46 ` syzbot
1 sibling, 1 reply; 5+ messages in thread
From: Kuniyuki Iwashima @ 2024-04-22 16:07 UTC (permalink / raw)
To: syzbot+42a0dc856239de4de60e
Cc: davem, edumazet, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs, kuniyu
From: syzbot <syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com>
Date: Thu, 18 Apr 2024 00:05:21 -0700
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: f2e367d6ad3b Merge tag 'for-6.8/dm-fix-3' of git://git.ker..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=144a8d4a180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472
> dashboard link: https://syzkaller.appspot.com/bug?extid=42a0dc856239de4de60e
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=149caa54180000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bb8e22180000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/0dabc03369d1/disk-f2e367d6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/240ca250d398/vmlinux-f2e367d6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/cc38bcdb48c9/bzImage-f2e367d6.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com
>
> =====================================================
> BUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
> BUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
> BUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
> ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]
> ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]
> ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668
> ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222
> __netdev_start_xmit include/linux/netdevice.h:4989 [inline]
> netdev_start_xmit include/linux/netdevice.h:5003 [inline]
> xmit_one net/core/dev.c:3547 [inline]
> dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563
> __dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351
> dev_queue_xmit include/linux/netdevice.h:3171 [inline]
> packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
> packet_snd net/packet/af_packet.c:3081 [inline]
> packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
> sock_sendmsg_nosec net/socket.c:730 [inline]
> __sock_sendmsg net/socket.c:745 [inline]
> __sys_sendto+0x735/0xa10 net/socket.c:2191
> __do_sys_sendto net/socket.c:2203 [inline]
> __se_sys_sendto net/socket.c:2199 [inline]
> __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was created at:
> slab_post_alloc_hook mm/slub.c:3819 [inline]
> slab_alloc_node mm/slub.c:3860 [inline]
> __do_kmalloc_node mm/slub.c:3980 [inline]
> __kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001
> kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582
> __alloc_skb+0x352/0x790 net/core/skbuff.c:651
> skb_segment+0x20aa/0x7080 net/core/skbuff.c:4647
> udp6_ufo_fragment+0xcab/0x1150 net/ipv6/udp_offload.c:109
> ipv6_gso_segment+0x14be/0x2ca0 net/ipv6/ip6_offload.c:152
> skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
> nsh_gso_segment+0x6f4/0xf70 net/nsh/nsh.c:108
> skb_mac_gso_segment+0x3e8/0x760 net/core/gso.c:53
> __skb_gso_segment+0x4b0/0x730 net/core/gso.c:124
> skb_gso_segment include/net/gso.h:83 [inline]
> validate_xmit_skb+0x107f/0x1930 net/core/dev.c:3628
> __dev_queue_xmit+0x1f28/0x51c0 net/core/dev.c:4343
> dev_queue_xmit include/linux/netdevice.h:3171 [inline]
> packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276
> packet_snd net/packet/af_packet.c:3081 [inline]
> packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113
> sock_sendmsg_nosec net/socket.c:730 [inline]
> __sock_sendmsg net/socket.c:745 [inline]
> __sys_sendto+0x735/0xa10 net/socket.c:2191
> __do_sys_sendto net/socket.c:2203 [inline]
> __se_sys_sendto net/socket.c:2199 [inline]
> __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> CPU: 1 PID: 5101 Comm: syz-executor421 Not tainted 6.8.0-rc5-syzkaller-00297-gf2e367d6ad3b #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
> =====================================================
[...]
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f2e367d6ad3bdc527c2b14e759c2f010d6b2b7a1
diff --git a/net/nsh/nsh.c b/net/nsh/nsh.c
index f4a38bd6a7e0..1344653916c4 100644
--- a/net/nsh/nsh.c
+++ b/net/nsh/nsh.c
@@ -77,13 +77,15 @@ EXPORT_SYMBOL_GPL(nsh_pop);
static struct sk_buff *nsh_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
+ unsigned int tnl_hlen, mac_len, nsh_len;
struct sk_buff *segs = ERR_PTR(-EINVAL);
u16 mac_offset = skb->mac_header;
- unsigned int nsh_len, mac_len;
- __be16 proto;
+ __be16 tnl_proto, proto;
skb_reset_network_header(skb);
+ tnl_proto = skb->protocol;
+ tnl_hlen = skb->network_header - skb->mac_header;
mac_len = skb->mac_len;
if (unlikely(!pskb_may_pull(skb, NSH_BASE_HDR_LEN)))
@@ -113,11 +115,11 @@ static struct sk_buff *nsh_gso_segment(struct sk_buff *skb,
}
for (skb = segs; skb; skb = skb->next) {
- skb->protocol = htons(ETH_P_NSH);
- __skb_push(skb, nsh_len);
- skb->mac_header = mac_offset;
- skb->network_header = skb->mac_header + mac_len;
+ __skb_push(skb, nsh_len + tnl_hlen);
+ skb_reset_mac_header(skb);
+ skb->network_header = skb->mac_header + tnl_hlen;
skb->mac_len = mac_len;
+ skb->protocol = tnl_proto;
}
out:
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2)
2024-04-22 16:07 ` Kuniyuki Iwashima
@ 2024-04-23 1:46 ` syzbot
0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2024-04-23 1:46 UTC (permalink / raw)
To: davem, edumazet, kuba, kuniyu, linux-kernel, netdev, pabeni,
syzkaller-bugs
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: syzbot+42a0dc856239de4de60e@syzkaller.appspotmail.com
Tested on:
commit: f2e367d6 Merge tag 'for-6.8/dm-fix-3' of git://git.ker..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1286b06b180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472
dashboard link: https://syzkaller.appspot.com/bug?extid=42a0dc856239de4de60e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=117ae96f180000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-04-23 1:46 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-04-18 7:05 [syzbot] [net?] KMSAN: uninit-value in ipvlan_queue_xmit (2) syzbot
2024-04-18 7:19 ` Eric Dumazet
2024-04-18 17:07 ` Kuniyuki Iwashima
2024-04-22 16:07 ` Kuniyuki Iwashima
2024-04-23 1:46 ` syzbot
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