kernel msg: ebtables bug: please report to author: Valid hook without chain ================================================================== BUG: KASAN: use-after-free in xfrm_policy_insert_list+0xd7f/0x1020 net/xfrm/xfrm_policy.c:1532 Read of size 1 at addr ffff8881cde4d419 by task syz-executor1/592 CPU: 1 PID: 592 Comm: syz-executor1 Not tainted 4.20.0-rc6+ #353 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+0x244/0x39d lib/dump_stack.c:113 netlink: 'syz-executor0': attribute type 40 has an invalid length. print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 xfrm_policy_insert_list+0xd7f/0x1020 net/xfrm/xfrm_policy.c:1532 xfrm_policy_inexact_insert+0x166/0xee0 net/xfrm/xfrm_policy.c:1195 xfrm_policy_insert+0x639/0x850 net/xfrm/xfrm_policy.c:1570 netlink: 'syz-executor0': attribute type 40 has an invalid length. pfkey_spdadd+0x10f8/0x19d0 net/key/af_key.c:2339 pfkey_process+0x857/0x9a0 net/key/af_key.c:2844 pfkey_sendmsg+0x5e5/0xfb0 net/key/af_key.c:3683 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116 __sys_sendmsg+0x11d/0x280 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+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb04ac53c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb04ac546d4 R13: 00000000004c443a R14: 00000000004d7410 R15: 00000000ffffffff Allocated by task 5941: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:546 [inline] syslog_print kernel/printk/printk.c:1301 [inline] do_syslog+0xb9b/0x1690 kernel/printk/printk.c:1469 kmsg_read+0x8f/0xc0 fs/proc/kmsg.c:40 proc_reg_read+0x2a3/0x3d0 fs/proc/inode.c:231 __vfs_read+0x117/0x9b0 fs/read_write.c:416 vfs_read+0x17f/0x3c0 fs/read_write.c:452 ksys_read+0x101/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5941: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 syslog_print kernel/printk/printk.c:1352 [inline] do_syslog+0x147b/0x1690 kernel/printk/printk.c:1469 kmsg_read+0x8f/0xc0 fs/proc/kmsg.c:40 proc_reg_read+0x2a3/0x3d0 fs/proc/inode.c:231 __vfs_read+0x117/0x9b0 fs/read_write.c:416 vfs_read+0x17f/0x3c0 fs/read_write.c:452 ksys_read+0x101/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881cde4d200 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 537 bytes inside of 1024-byte region [ffff8881cde4d200, ffff8881cde4d600) The buggy address belongs to the page: page:ffffea0007379300 count:1 mapcount:0 mapping:ffff8881da800ac0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea0006fdd508 ffffea00075de288 ffff8881da800ac0 raw: 0000000000000000 ffff8881cde4c000 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cde4d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cde4d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881cde4d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881cde4d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cde4d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================