From: syzbot <syzbot+b6f07e1c07ef40199081@syzkaller.appspotmail.com>
To: coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com,
kadlec@netfilter.org, kuba@kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
netfilter-devel@vger.kernel.org, pabeni@redhat.com,
pablo@netfilter.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [netfilter?] KMSAN: uninit-value in nf_flow_offload_ip_hook
Date: Thu, 04 Apr 2024 05:49:31 -0700 [thread overview]
Message-ID: <00000000000040a883061544c59f@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 3e92c1e6cd87 Merge tag 'selinux-pr-20240402' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=135dbd3d180000
kernel config: https://syzkaller.appspot.com/x/.config?x=5112b3f484393436
dashboard link: https://syzkaller.appspot.com/bug?extid=b6f07e1c07ef40199081
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ac287f716705/disk-3e92c1e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f04f8cb0bdc6/vmlinux-3e92c1e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8eb9003da40/bzImage-3e92c1e6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b6f07e1c07ef40199081@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in nf_flow_skb_encap_protocol net/netfilter/nf_flow_table_ip.c:290 [inline]
BUG: KMSAN: uninit-value in nf_flow_offload_lookup net/netfilter/nf_flow_table_ip.c:352 [inline]
BUG: KMSAN: uninit-value in nf_flow_offload_ip_hook+0x79a/0x3e40 net/netfilter/nf_flow_table_ip.c:424
nf_flow_skb_encap_protocol net/netfilter/nf_flow_table_ip.c:290 [inline]
nf_flow_offload_lookup net/netfilter/nf_flow_table_ip.c:352 [inline]
nf_flow_offload_ip_hook+0x79a/0x3e40 net/netfilter/nf_flow_table_ip.c:424
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xf2/0x3f0 net/netfilter/core.c:626
nf_hook_ingress include/linux/netfilter_netdev.h:34 [inline]
nf_ingress net/core/dev.c:5318 [inline]
__netif_receive_skb_core+0x430b/0x6190 net/core/dev.c:5406
__netif_receive_skb_one_core net/core/dev.c:5536 [inline]
__netif_receive_skb+0xca/0xa00 net/core/dev.c:5652
netif_receive_skb_internal net/core/dev.c:5738 [inline]
netif_receive_skb+0x58/0x660 net/core/dev.c:5798
tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549
tun_get_user+0x5566/0x69e0 drivers/net/tun.c:2002
tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048
call_write_iter include/linux/fs.h:2108 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xb63/0x1520 fs/read_write.c:590
ksys_write+0x20f/0x4c0 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:652
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x72/0x7a
Uninit was created at:
__alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264
alloc_pages+0x1bf/0x1e0 mm/mempolicy.c:2335
skb_page_frag_refill+0x2bf/0x7c0 net/core/sock.c:2921
tun_build_skb drivers/net/tun.c:1679 [inline]
tun_get_user+0x1258/0x69e0 drivers/net/tun.c:1819
tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048
call_write_iter include/linux/fs.h:2108 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xb63/0x1520 fs/read_write.c:590
ksys_write+0x20f/0x4c0 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__x64_sys_write+0x93/0xe0 fs/read_write.c:652
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x72/0x7a
CPU: 0 PID: 5636 Comm: syz-executor.0 Not tainted 6.9.0-rc2-syzkaller-00042-g3e92c1e6cd87 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
=====================================================
---
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next reply other threads:[~2024-04-04 12:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-04 12:49 syzbot [this message]
2024-04-04 20:37 ` [syzbot] [netfilter?] KMSAN: uninit-value in nf_flow_offload_ip_hook syzbot
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