linux-kernel - Re: [syzbot] [netfilter?] KASAN: slab-use-after-free Read in nf_tables_trans_destroy

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Date: Tue, 02 Jul 2024 07:13:04 -0700
From: syzbot <syzbot+4fd66a69358fc15ae2ad@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [netfilter?] KASAN: slab-use-after-free Read in nf_tables_trans_destroy_work

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in __nft_release_table

------------[ cut here ]------------
WARNING: CPU: 1 PID: 5870 at net/netfilter/nf_tables_api.c:1667 nf_tables_table_destroy net/netfilter/nf_tables_api.c:1667 [inline]
WARNING: CPU: 1 PID: 5870 at net/netfilter/nf_tables_api.c:1667 __nft_release_table+0xed3/0xf40 net/netfilter/nf_tables_api.c:11518
Modules linked in:
CPU: 1 PID: 5870 Comm: syz.3.18 Not tainted 6.10.0-rc5-syzkaller-01137-g1c5fc27bc48a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:nf_tables_table_destroy net/netfilter/nf_tables_api.c:1667 [inline]
RIP: 0010:__nft_release_table+0xed3/0xf40 net/netfilter/nf_tables_api.c:11518
Code: 8b 04 25 28 00 00 00 48 3b 84 24 e0 00 00 00 75 72 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 6e f3 e0 f7 90 <0f> 0b 90 eb a8 89 d9 80 e1 07 fe c1 38 c1 0f 8c fd f1 ff ff 48 89
RSP: 0018:ffffc900045e78a0 EFLAGS: 00010293
RAX: ffffffff89b53392 RBX: 0000000000000001 RCX: ffff88802a273c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900045e79d0 R08: ffffffff89b532c3 R09: 1ffffffff25f78ca
R10: dffffc0000000000 R11: fffffbfff25f78cb R12: dffffc0000000000
R13: ffff88801ee19100 R14: ffff88801181e970 R15: ffff88801181e9c0
FS:  00005555817aa500(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000200 CR3: 000000001c2b0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nft_rcv_nl_event+0x55f/0x6d0 net/netfilter/nf_tables_api.c:11577
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:388
 netlink_release+0x11a6/0x1b10 net/netlink/af_netlink.c:787
 __sock_release net/socket.c:659 [inline]
 sock_close+0xbc/0x240 net/socket.c:1421
 __fput+0x406/0x8b0 fs/file_table.c:422
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f91b1775b99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff8ddfaf58 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000019328 RCX: 00007f91b1775b99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: ffffffffffffffff R08: 0000000000000001 R09: 000000048ddfb26f
R10: 00007f91b1600000 R11: 0000000000000246 R12: 00007f91b1903fac
R13: 0000000000000032 R14: 00007f91b1905aa0 R15: 00007f91b1903fa0
 </TASK>


Tested on:

commit:         1c5fc27b Merge tag 'nf-next-24-06-28' of git://git.ker..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=107e8ec6980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5264b58fdff6e881
dashboard link: https://syzkaller.appspot.com/bug?extid=4fd66a69358fc15ae2ad
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=137e0f1e980000