From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f80.google.com (mail-io1-f80.google.com [209.85.166.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6194927453 for ; Fri, 18 Jul 2025 01:06:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752800791; cv=none; b=uxgrnhFV7Bn4PU1Kz5r5JkVnb/CyrvAqjDDYN4wf3kamom8qsFllJTFlB8g5QIf/WIoiiO+OeWYCvKBEPPQY22hr2h+vOIKeyeUhBF7AimmcnQ/Qtdrp2r4MfC0Sl+0p6c3dy5Perz4zgzyPWtg8xcbLsDg4c16uu8QjJEfYO5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752800791; c=relaxed/simple; bh=xes/QDIUIHN8EjLPNglaHTdMVrh+eaR9Yu4cJRkqgvY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:488a:b0:87c:a93:da20 with SMTP id ca18e2360f4ac-87c0a93dc07mr305789739f.10.1752800788459; Thu, 17 Jul 2025 18:06:28 -0700 (PDT) Date: Thu, 17 Jul 2025 18:06:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68799e14.a00a0220.3af5df.0025.GAE@google.com> Subject: [syzbot] [netfilter?] KASAN: slab-out-of-bounds Read in nfacct_mt_checkentry From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, edumazet@google.com, fw@strlen.de, horms@kernel.org, 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 Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5d5d62298b8b Merge tag 'x86_urgent_for_v6.16_rc6' of git:/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1655418c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da dashboard link: https://syzkaller.appspot.com/bug?extid=4ff165b9251e4d295690 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=156787d4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=136787d4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/621a2e2bbe6e/disk-5d5d6229.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1822022cd8cb/vmlinux-5d5d6229.xz kernel image: https://storage.googleapis.com/syzbot-assets/10cee653a6cd/bzImage-5d5d6229.xz The issue was bisected to: commit 6001a930ce0378b62210d4f83583fc88a903d89d Author: Pablo Neira Ayuso Date: Mon Feb 15 11:28:07 2021 +0000 netfilter: nftables: introduce table ownership bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=133e518c580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10be518c580000 console output: https://syzkaller.appspot.com/x/log.txt?x=173e518c580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4ff165b9251e4d295690@syzkaller.appspotmail.com Fixes: 6001a930ce03 ("netfilter: nftables: introduce table ownership") ================================================================== BUG: KASAN: slab-out-of-bounds in string_nocheck lib/vsprintf.c:639 [inline] BUG: KASAN: slab-out-of-bounds in string+0x231/0x2b0 lib/vsprintf.c:721 Read of size 1 at addr ffff88801eac95c8 by task syz-executor183/5851 CPU: 0 UID: 0 PID: 5851 Comm: syz-executor183 Not tainted 6.16.0-rc5-syzkaller-00276-g5d5d62298b8b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x230 mm/kasan/report.c:480 kasan_report+0x118/0x150 mm/kasan/report.c:593 string_nocheck lib/vsprintf.c:639 [inline] string+0x231/0x2b0 lib/vsprintf.c:721 vsnprintf+0x739/0xf00 lib/vsprintf.c:2874 vprintk_store+0x3c7/0xd00 kernel/printk/printk.c:2279 vprintk_emit+0x21e/0x7a0 kernel/printk/printk.c:2426 _printk+0xcf/0x120 kernel/printk/printk.c:2475 nfacct_mt_checkentry+0xd2/0xe0 net/netfilter/xt_nfacct.c:41 xt_check_match+0x3d1/0xab0 net/netfilter/x_tables.c:523 __nft_match_init+0x63a/0x840 net/netfilter/nft_compat.c:520 nf_tables_newexpr net/netfilter/nf_tables_api.c:3493 [inline] nf_tables_newrule+0x178c/0x2890 net/netfilter/nf_tables_api.c:4324 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:525 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:648 [inline] nfnetlink_rcv+0x1132/0x2520 net/netfilter/nfnetlink.c:666 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x759/0x8e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa7bbf1c6a9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff7139c908 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fff7139cad8 RCX: 00007fa7bbf1c6a9 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 00007fa7bbf8f610 R08: 0000000000000002 R09: 00007fff7139cad8 R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff7139cac8 R14: 0000000000000001 R15: 0000000000000001 Allocated by task 5851: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] nf_tables_newrule+0x1506/0x2890 net/netfilter/nf_tables_api.c:4306 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:525 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:648 [inline] nfnetlink_rcv+0x1132/0x2520 net/netfilter/nfnetlink.c:666 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x759/0x8e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88801eac9580 which belongs to the cache kmalloc-cg-96 of size 96 The buggy address is located 0 bytes to the right of allocated 72-byte region [ffff88801eac9580, ffff88801eac95c8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1eac9 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801a449640 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 2776913905, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_noprof+0x305/0x4f0 mm/slub.c:4340 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] __register_sysctl_table+0x72/0x1340 fs/proc/proc_sysctl.c:1380 user_namespace_sysctl_init+0x25/0x150 kernel/ucount.c:355 do_one_initcall+0x233/0x820 init/main.c:1274 do_initcall_level+0x137/0x1f0 init/main.c:1336 do_initcalls+0x69/0xd0 init/main.c:1352 kernel_init_freeable+0x3d9/0x570 init/main.c:1584 kernel_init+0x1d/0x1d0 init/main.c:1474 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page_owner free stack trace missing Memory state around the buggy address: ffff88801eac9480: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88801eac9500: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88801eac9580: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ^ ffff88801eac9600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801eac9680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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