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Message-ID: <000000000000ee8def061c2f1338@google.com>
Date: Mon, 01 Jul 2024 05:53:03 -0700
From: syzbot <syzbot+0e6ddb1ef80986bdfe64@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
wojciech.gladysz@...ogain.com
Subject: Re: [syzbot] [net?] KMSAN: uninit-value in bpf_prog_run_generic_xdp
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in bpf_prog_run_generic_xdp
=====================================================
BUG: KMSAN: uninit-value in bpf_prog_run_generic_xdp+0x13a0/0x1ee0 net/core/dev.c:4923
bpf_prog_run_generic_xdp+0x13a0/0x1ee0 net/core/dev.c:4923
netif_receive_generic_xdp net/core/dev.c:5005 [inline]
do_xdp_generic+0xb68/0x1440 net/core/dev.c:5064
__netif_receive_skb_core+0x2533/0x6190 net/core/dev.c:5405
__netif_receive_skb_one_core net/core/dev.c:5583 [inline]
__netif_receive_skb+0xca/0xa00 net/core/dev.c:5699
process_backlog+0x49d/0x920 net/core/dev.c:6028
__napi_poll+0xe7/0x980 net/core/dev.c:6679
napi_poll net/core/dev.c:6748 [inline]
net_rx_action+0x82a/0x1850 net/core/dev.c:6864
__do_softirq+0x1c0/0x7d7 kernel/softirq.c:554
do_softirq+0x9a/0x100 kernel/softirq.c:455
__local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:382
__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock_bh+0x2d/0x40 kernel/locking/spinlock.c:210
spin_unlock_bh include/linux/spinlock.h:396 [inline]
release_sock+0x219/0x250 net/core/sock.c:3559
j1939_sk_sendmsg+0x23d8/0x2730 net/can/j1939/socket.c:1280
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:745
____sys_sendmsg+0x877/0xb60 net/socket.c:2584
___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638
__sys_sendmsg net/socket.c:2667 [inline]
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x307/0x4a0 net/socket.c:2674
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x6d/0x75
Uninit was stored to memory at:
pskb_expand_head+0x30f/0x19d0 net/core/skbuff.c:2253
netif_skb_check_for_xdp net/core/dev.c:4968 [inline]
netif_receive_generic_xdp net/core/dev.c:4999 [inline]
do_xdp_generic+0x931/0x1440 net/core/dev.c:5064
__netif_receive_skb_core+0x2533/0x6190 net/core/dev.c:5405
__netif_receive_skb_one_core net/core/dev.c:5583 [inline]
__netif_receive_skb+0xca/0xa00 net/core/dev.c:5699
process_backlog+0x49d/0x920 net/core/dev.c:6028
__napi_poll+0xe7/0x980 net/core/dev.c:6679
napi_poll net/core/dev.c:6748 [inline]
net_rx_action+0x82a/0x1850 net/core/dev.c:6864
__do_softirq+0x1c0/0x7d7 kernel/softirq.c:554
Uninit was created at:
slab_post_alloc_hook mm/slub.c:3804 [inline]
slab_alloc_node mm/slub.c:3845 [inline]
kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577
__alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668
alloc_skb include/linux/skbuff.h:1313 [inline]
alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504
sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795
sock_alloc_send_skb include/net/sock.h:1842 [inline]
j1939_sk_alloc_skb net/can/j1939/socket.c:878 [inline]
j1939_sk_send_loop net/can/j1939/socket.c:1142 [inline]
j1939_sk_sendmsg+0xc0a/0x2730 net/can/j1939/socket.c:1277
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:745
____sys_sendmsg+0x877/0xb60 net/socket.c:2584
___sys_sendmsg+0x28d/0x3c0 net/socket.c:2638
__sys_sendmsg net/socket.c:2667 [inline]
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x307/0x4a0 net/socket.c:2674
do_syscall_64+0xd5/0x1f0
entry_SYSCALL_64_after_hwframe+0x6d/0x75
CPU: 1 PID: 5441 Comm: syz-executor.0 Not tainted 6.9.0-rc1-syzkaller-00257-ge478cf26c556-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
=====================================================
Tested on:
commit: e478cf26 Merge branch 'bpf-fix-a-couple-of-test-failur..
git tree: https://linux.googlesource.com/linux/kernel/git/torvalds/linux
console output: https://syzkaller.appspot.com/x/log.txt?x=1648f869980000
kernel config: https://syzkaller.appspot.com/x/.config?x=e2599baf258ef795
dashboard link: https://syzkaller.appspot.com/bug?extid=0e6ddb1ef80986bdfe64
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=11c3ffa6980000
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