================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b5/0x660 net/xfrm/xfrm_policy.c:874 Read of size 1 at addr ffff888060d22600 by task syz.1.493/6387 CPU: 0 PID: 6387 Comm: syz.1.493 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 xfrm_policy_inexact_list_reinsert+0x5b5/0x660 net/xfrm/xfrm_policy.c:874 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline] xfrm_policy_inexact_insert_node+0x8e7/0xb00 net/xfrm/xfrm_policy.c:1062 xfrm_policy_inexact_alloc_chain+0x604/0xe20 net/xfrm/xfrm_policy.c:1178 xfrm_policy_inexact_insert+0xea/0x13c0 net/xfrm/xfrm_policy.c:1221 xfrm_policy_insert+0xe6/0x930 net/xfrm/xfrm_policy.c:1602 xfrm_add_policy+0x4f7/0x9b0 net/xfrm/xfrm_user.c:1833 xfrm_user_rcv_msg+0x632/0x960 net/xfrm/xfrm_user.c:2979 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2489 xfrm_netlink_rcv+0x75/0x90 net/xfrm/xfrm_user.c:3001 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x7c0/0x990 net/netlink/af_netlink.c:1337 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f58ac1e8169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f58aa050038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f58ac40ffa0 RCX: 00007f58ac1e8169 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007f58ac26aa68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f58ac40ffa0 R15: 00007ffdd6b58488 Allocated by task 6387: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x168/0x300 mm/slub.c:4407 kmalloc include/linux/slab.h:609 [inline] sk_prot_alloc+0xe0/0x200 net/core/sock.c:1866 sk_alloc+0x35/0x310 net/core/sock.c:1919 pfkey_create+0xda/0x580 net/key/af_key.c:152 __sock_create+0x460/0x8f0 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0x132/0x370 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1591 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087 netlink_release+0x14e4/0x1980 net/netlink/af_netlink.c:800 __sock_release net/socket.c:649 [inline] sock_close+0xcd/0x230 net/socket.c:1336 __fput+0x3fe/0x8e0 fs/file_table.c:311 task_work_run+0x129/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0x80 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888060d22000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1536 bytes inside of 2048-byte region [ffff888060d22000, ffff888060d22800) The buggy address belongs to the page: page:ffffea0001834800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x60d20 head:ffffea0001834800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888017442000 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4176, ts 56021331162, free_ts 13594531237 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5466 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] __kmalloc_track_caller+0x1c7/0x300 mm/slub.c:4925 kmemdup+0x21/0x50 mm/util.c:128 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3652 addrconf_sysctl_register+0xac/0x190 net/ipv6/addrconf.c:7147 ipv6_add_dev+0xc9b/0x1180 net/ipv6/addrconf.c:454 addrconf_notify+0x697/0xf40 net/ipv6/addrconf.c:3579 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] register_netdevice+0x128e/0x16a0 net/core/dev.c:10427 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:317 [inline] nsim_create+0x329/0x3e0 drivers/net/netdevsim/netdev.c:365 __nsim_dev_port_add+0x6de/0xb90 drivers/net/netdevsim/dev.c:1312 nsim_dev_port_add_all+0x35/0x110 drivers/net/netdevsim/dev.c:1372 nsim_dev_probe+0x752/0x9f0 drivers/net/netdevsim/dev.c:1513 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_contig_range+0x95/0xf0 mm/page_alloc.c:9385 destroy_args+0xfe/0x980 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x40d/0x470 mm/debug_vm_pgtable.c:1331 do_one_initcall+0x22b/0x7a0 init/main.c:1302 do_initcall_level+0x157/0x210 init/main.c:1375 do_initcalls+0x49/0x90 init/main.c:1391 kernel_init_freeable+0x425/0x5c0 init/main.c:1615 kernel_init+0x19/0x290 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888060d22500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888060d22580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff888060d22600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888060d22680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888060d22700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================