Hello, syzbot found the following issue on: HEAD commit: 38f83a57aa8e Merge branch 'virtio-net-support-af_xdp-zero-.. git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=13f19378580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e6d63a300b6a84a4 dashboard link: https://syzkaller.appspot.com/bug?extid=6c8215822f35fdb35667 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=169dd2c0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130552e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a7abf65d2870/disk-38f83a57.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2958de0862bb/vmlinux-38f83a57.xz kernel image: https://storage.googleapis.com/syzbot-assets/404efcb8d16f/bzImage-38f83a57.xz The issue was bisected to: commit 6001a930ce0378b62210d4f83583fc88a903d89d Author: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Date: Mon Feb 15 11:28:07 2021 +0000 netfilter: nftables: introduce table ownership bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=172932e8580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=14a932e8580000 console output: https://syzkaller.appspot.com/x/log.txt?x=10a932e8580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6c8215822f35fdb35667@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 6001a930ce03 ("netfilter: nftables: introduce table ownership") ================================================================== BUG: KASAN: slab-out-of-bounds in strlen+0x58/0x70 lib/string.c:402 Read of size 1 at addr ffff8881422aa1c8 by task syz-executor355/5842 CPU: 1 UID: 0 PID: 5842 Comm: syz-executor355 Not tainted 6.12.0-rc7-syzkaller-01681-g38f83a57aa8e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 strlen+0x58/0x70 lib/string.c:402 kstrdup+0x20/0x80 mm/util.c:63 led_tg_check+0x18b/0x3c0 net/netfilter/xt_LED.c:115 xt_check_target+0x3b9/0xa40 net/netfilter/x_tables.c:1038 nft_target_init+0x82d/0xc30 net/netfilter/nft_compat.c:267 nf_tables_newexpr net/netfilter/nf_tables_api.c:3444 [inline] nf_tables_newrule+0x185e/0x2980 net/netfilter/nf_tables_api.c:4272 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:524 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0x14e3/0x2ab0 net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1316 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1342 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1886 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:744 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2609 ___sys_sendmsg net/socket.c:2663 [inline] __sys_sendmsg+0x292/0x380 net/socket.c:2692 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f56d8509729 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:00007ffc32fd10f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffc32fd12c8 RCX: 00007f56d8509729 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f56d857c610 R08: 0000000000000011 R09: 00007ffc32fd12c8 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc32fd12b8 R14: 0000000000000001 R15: 0000000000000001 </TASK> Allocated by task 5842: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] nf_tables_newrule+0x1609/0x2980 net/netfilter/nf_tables_api.c:4254 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:524 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline] nfnetlink_rcv+0x14e3/0x2ab0 net/netfilter/nfnetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1316 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1342 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1886 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:744 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2609 ___sys_sendmsg net/socket.c:2663 [inline] __sys_sendmsg+0x292/0x380 net/socket.c:2692 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8881422aa180 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 [ffff8881422aa180, ffff8881422aa1c8) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1422aa flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000000 ffff88801ac4d640 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080200020 00000001f5000000 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 2682440014, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0x3649/0x3790 mm/page_alloc.c:3474 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4750 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x140 mm/slub.c:2412 allocate_slab+0x5a/0x2f0 mm/slub.c:2578 new_slab mm/slub.c:2631 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818 __slab_alloc+0x58/0xa0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_noprof+0x25a/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] kzalloc_noprof include/linux/slab.h:1014 [inline] __register_sysctl_table+0x65/0x1550 fs/proc/proc_sysctl.c:1368 net_sysctl_init+0x20/0x90 net/sysctl_net.c:103 sock_init+0x6b/0x1c0 net/socket.c:3293 do_one_initcall+0x248/0x880 init/main.c:1269 do_initcall_level+0x157/0x210 init/main.c:1331 do_initcalls+0x3f/0x80 init/main.c:1347 kernel_init_freeable+0x435/0x5d0 init/main.c:1580 page_owner free stack trace missing Memory state around the buggy address: ffff8881422aa080: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ffff8881422aa100: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc >ffff8881422aa180: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ^ ffff8881422aa200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881422aa280: 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@xxxxxxxxxxxxxxxx. 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
