kernel msg: ebtables bug: please report to author: Valid hook without chain ================================================================== BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:218 [inline] BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:702 [inline] BUG: KASAN: use-after-free in hlist_del_init include/linux/list.h:717 [inline] BUG: KASAN: use-after-free in __xfrm_policy_unlink+0x977/0xa00 net/xfrm/xfrm_policy.c:2213 Write of size 8 at addr ffff88809618c828 by task syz-executor1/1851 CPU: 0 PID: 1851 Comm: syz-executor1 Not tainted 5.0.0-rc2+ #13 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:140 __write_once_size include/linux/compiler.h:218 [inline] __hlist_del include/linux/list.h:702 [inline] hlist_del_init include/linux/list.h:717 [inline] __xfrm_policy_unlink+0x977/0xa00 net/xfrm/xfrm_policy.c:2213 xfrm_policy_insert+0x223/0x910 net/xfrm/xfrm_policy.c:1587 xfrm_add_policy+0x2a1/0x6c0 net/xfrm/xfrm_user.c:1657 xfrm_user_rcv_msg+0x458/0x8d0 net/xfrm/xfrm_user.c:2663 netlink_rcv_skb+0x17d/0x410 net/netlink/af_netlink.c:2485 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2671 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x574/0x770 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa05/0xf90 net/netlink/af_netlink.c:1925 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x7ec/0x910 net/socket.c:2116 __sys_sendmsg+0x112/0x270 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2e7a4a3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 RDX: 0000000000000000 RSI: 000000002014f000 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2e7a4a46d4 R13: 00000000004c562b R14: 00000000004d9298 R15: 00000000ffffffff Allocated by task 2513: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 __do_kmalloc mm/slab.c:3711 [inline] __kmalloc+0x15c/0x740 mm/slab.c:3720 kmalloc_array include/linux/slab.h:668 [inline] kcalloc include/linux/slab.h:679 [inline] alloc_pipe_info+0x286/0x580 fs/pipe.c:650 get_pipe_inode fs/pipe.c:712 [inline] create_pipe_files+0x8e/0x730 fs/pipe.c:744 __do_pipe_flags+0x48/0x250 fs/pipe.c:781 do_pipe2+0x91/0x300 fs/pipe.c:829 __do_sys_pipe2 fs/pipe.c:847 [inline] __se_sys_pipe2 fs/pipe.c:845 [inline] __x64_sys_pipe2+0x54/0x80 fs/pipe.c:845 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2513: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 free_pipe_info+0x24b/0x300 fs/pipe.c:683 put_pipe_info+0xd0/0xf0 fs/pipe.c:556 pipe_release+0x1e6/0x280 fs/pipe.c:577 __fput+0x3c5/0xb10 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x1f4/0x2b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x32a/0x3b0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809618c480 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 936 bytes inside of 1024-byte region [ffff88809618c480, ffff88809618c880) The buggy address belongs to the page: page:ffffea0002586300 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0xffff88809618c000 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00021cea88 ffffea0002591008 ffff88812c3f0ac0 raw: ffff88809618c000 ffff88809618c000 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809618c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809618c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809618c800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809618c880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809618c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================