KASAN: slab-use-after-free Read in nf_tables_trans_destroy_work (2)

Status: fixed on 2025/06/10 16:19
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+5d8c5789c8cb076b2c25@syzkaller.appspotmail.com
Fix commit: fb8286562ecf netfilter: nf_tables: make destruction work queue pernet
First crash: 509d, last: 509d
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH net 3/3] netfilter: nf_tables: make destruction work queue pernet 1 (1) 2025/03/06 15:34
[PATCH nf v2] netfilter: nf_tables: make destruction work queue pernet 1 (1) 2025/03/06 03:05
[PATCH nf] netfilter: nf_tables: make destruction work queue pernet 3 (3) 2025/03/06 02:50
[syzbot] [netfilter?] KASAN: slab-use-after-free Read in nf_tables_trans_destroy_work (2) 2 (6) 2025/03/04 03:53
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-use-after-free Read in nf_tables_trans_destroy_work netfilter 19 C error 147 745d 752d 26/29 fixed on 2024/08/06 11:02
upstream KASAN: use-after-free Read in nf_tables_trans_destroy_work netfilter 19 C done 6 1376d 1382d 22/29 fixed on 2023/02/24 13:50
▶ ▼ Last patch testing requests (3)
Created Duration User Patch Repo Result
2025/03/04 03:53 19m fw@strlen.de patch upstream OK log
2025/03/03 11:30 18m hdanton@sina.com patch upstream OK log
2025/03/03 10:54 13m hdanton@sina.com patch upstream report log

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in nft_ctx_update include/net/netfilter/nf_tables.h:1861 [inline]
BUG: KASAN: slab-use-after-free in nft_commit_release net/netfilter/nf_tables_api.c:9958 [inline]
BUG: KASAN: slab-use-after-free in nf_tables_trans_destroy_work+0x9af/0xae0 net/netfilter/nf_tables_api.c:10023
Read of size 2 at addr ffff88804ee0e9c4 by task kworker/0:3/6521

CPU: 0 UID: 0 PID: 6521 Comm: kworker/0:3 Not tainted 6.14.0-rc4-syzkaller-00248-g03d38806a902 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events nf_tables_trans_destroy_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xc3/0x670 mm/kasan/report.c:521
 kasan_report+0xd9/0x110 mm/kasan/report.c:634
 nft_ctx_update include/net/netfilter/nf_tables.h:1861 [inline]
 nft_commit_release net/netfilter/nf_tables_api.c:9958 [inline]
 nf_tables_trans_destroy_work+0x9af/0xae0 net/netfilter/nf_tables_api.c:10023
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 14088:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kmalloc_noprof include/linux/slab.h:901 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 nf_tables_newtable+0xd79/0x1b40 net/netfilter/nf_tables_api.c:1574
 nfnetlink_rcv_batch+0x1a2a/0x24e0 net/netfilter/nfnetlink.c:524
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
 nfnetlink_rcv+0x3c3/0x430 net/netfilter/nfnetlink.c:665
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1882
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:733 [inline]
 ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2573
 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2627
 __sys_sendmsg+0x16e/0x220 net/socket.c:2659
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 14086:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2353 [inline]
 slab_free mm/slub.c:4609 [inline]
 kfree+0x2c4/0x4d0 mm/slub.c:4757
 nf_tables_table_destroy+0xb3/0xf0 net/netfilter/nf_tables_api.c:1781
 __nft_release_table+0xf8b/0x13d0 net/netfilter/nf_tables_api.c:11818
 nft_rcv_nl_event+0x4c9/0x6b0 net/netfilter/nf_tables_api.c:11876
 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85
 blocking_notifier_call_chain kernel/notifier.c:380 [inline]
 blocking_notifier_call_chain+0x69/0xa0 kernel/notifier.c:368
 netlink_release+0x1838/0x1fe0 net/netlink/af_netlink.c:764
 __sock_release+0xb0/0x270 net/socket.c:647
 sock_close+0x1c/0x30 net/socket.c:1398
 __fput+0x3ff/0xb70 fs/file_table.c:464
 task_work_run+0x14e/0x250 kernel/task_work.c:227
 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:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Last potentially related work creation:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xb8/0xd0 mm/kasan/generic.c:548
 insert_work+0x36/0x230 kernel/workqueue.c:2183
 __queue_work+0x97e/0x10f0 kernel/workqueue.c:2341
 queue_work_on+0x11a/0x140 kernel/workqueue.c:2392
 queue_work include/linux/workqueue.h:662 [inline]
 schedule_work include/linux/workqueue.h:723 [inline]
 __rhashtable_remove_fast_one include/linux/rhashtable.h:1069 [inline]
 __rhashtable_remove_fast.constprop.0.isra.0+0xed7/0x12b0 include/linux/rhashtable.h:1093
 rhltable_remove include/linux/rhashtable.h:1144 [inline]
 nft_chain_del+0x57/0x1a0 net/netfilter/nf_tables_api.c:10207
 __nft_release_table+0xf0e/0x13d0 net/netfilter/nf_tables_api.c:11814
 nft_rcv_nl_event+0x4c9/0x6b0 net/netfilter/nf_tables_api.c:11876
 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85
 blocking_notifier_call_chain kernel/notifier.c:380 [inline]
 blocking_notifier_call_chain+0x69/0xa0 kernel/notifier.c:368
 netlink_release+0x1838/0x1fe0 net/netlink/af_netlink.c:764
 __sock_release+0xb0/0x270 net/socket.c:647
 sock_close+0x1c/0x30 net/socket.c:1398
 __fput+0x3ff/0xb70 fs/file_table.c:464
 task_work_run+0x14e/0x250 kernel/task_work.c:227
 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:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88804ee0e800
 which belongs to the cache kmalloc-cg-512 of size 512
The buggy address is located 452 bytes inside of
 freed 512-byte region [ffff88804ee0e800, ffff88804ee0ea00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ee0c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8880280fae01
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b04de00 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 ffff8880280fae01
head: 00fff00000000040 ffff88801b04de00 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 ffff8880280fae01
head: 00fff00000000002 ffffea00013b8301 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5653, tgid 5653 (dhcpcd), ts 208176970817, free_ts 208162705163
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739
 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab mm/slub.c:2587 [inline]
 new_slab+0x23d/0x330 mm/slub.c:2640
 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 __do_kmalloc_node mm/slub.c:4293 [inline]
 __kmalloc_node_track_caller_noprof+0x2f1/0x510 mm/slub.c:4313
 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:537
 __alloc_skb+0x164/0x380 net/core/skbuff.c:606
 alloc_skb include/linux/skbuff.h:1331 [inline]
 alloc_skb_with_frags+0xe4/0x850 net/core/skbuff.c:6522
 sock_alloc_send_pskb+0x7f1/0x980 net/core/sock.c:2914
 unix_dgram_sendmsg+0x45e/0x1880 net/unix/af_unix.c:2017
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:733 [inline]
 sock_write_iter+0x4fe/0x5b0 net/socket.c:1137
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0x5ae/0x1150 fs/read_write.c:679
 ksys_write+0x207/0x250 fs/read_write.c:731
page last free pid 14050 tgid 14050 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660
 __put_partials+0x14c/0x170 mm/slub.c:3153
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4171
 ptlock_alloc+0x1f/0x70 mm/memory.c:7055
 ptlock_init include/linux/mm.h:2972 [inline]
 pagetable_pte_ctor include/linux/mm.h:3020 [inline]
 __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline]
 pte_alloc_one+0x74/0x390 arch/x86/mm/pgtable.c:44
 do_fault_around mm/memory.c:5355 [inline]
 do_read_fault mm/memory.c:5394 [inline]
 do_fault mm/memory.c:5537 [inline]
 do_pte_missing+0x1aff/0x3e10 mm/memory.c:4058
 handle_pte_fault mm/memory.c:5900 [inline]
 __handle_mm_fault+0x1166/0x2c60 mm/memory.c:6043
 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6212
 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1337
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

Memory state around the buggy address:
 ffff88804ee0e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804ee0e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804ee0e980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88804ee0ea00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804ee0ea80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/01 22:12 upstream 03d38806a902 c3901742 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-use-after-free Read in nf_tables_trans_destroy_work
* Struck through repros no longer work on HEAD.