================================================================== BUG: KASAN: use-after-free in memcmp lib/string.c:776 [inline] BUG: KASAN: use-after-free in bcmp+0x1af/0x1e0 lib/string.c:797 Read of size 1 at addr ffff8880426f6028 by task syz-executor.4/11070 CPU: 1 PID: 11070 Comm: syz-executor.4 Not tainted 6.1.0-syzkaller-09941-ge2ca6ba6ba01 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x1f0 mm/kasan/report.c:417 kasan_report+0xcd/0x100 mm/kasan/report.c:517 memcmp lib/string.c:776 [inline] bcmp+0x1af/0x1e0 lib/string.c:797 _Z6memcmpPKvU17pass_object_size0S0_U17pass_object_size0m include/linux/fortify-string.h:549 [inline] mi_find_attr+0x124/0x2b0 fs/ntfs3/record.c:310 ni_find_attr+0x38d/0x8c0 fs/ntfs3/frecord.c:202 ntfs_reparse_init+0xd6/0x240 fs/ntfs3/fsntfs.c:2243 ntfs_fill_super+0x4089/0x4370 fs/ntfs3/super.c:1248 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f413fe8d60a Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f4140b47f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000001f388 RCX: 00007f413fe8d60a RDX: 0000000020000180 RSI: 0000000020000300 RDI: 00007f4140b47fe0 RBP: 00007f4140b48020 R08: 00007f4140b48020 R09: 0000000000000800 R10: 0000000000000800 R11: 0000000000000202 R12: 0000000020000180 R13: 0000000020000300 R14: 00007f4140b47fe0 R15: 0000000020000080 Allocated by task 11070: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:968 [inline] __kmalloc+0xaf/0x190 mm/slab_common.c:981 kmalloc include/linux/slab.h:584 [inline] mi_init+0x72/0xe0 fs/ntfs3/record.c:105 ntfs_read_mft fs/ntfs3/inode.c:53 [inline] ntfs_iget5+0x309/0x36f0 fs/ntfs3/inode.c:501 dir_search_u+0x2aa/0x320 fs/ntfs3/dir.c:264 ntfs_extend_init+0x295/0x5a0 fs/ntfs3/fsntfs.c:225 ntfs_fill_super+0x3ff4/0x4370 fs/ntfs3/super.c:1243 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 11070: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3800 mi_clear fs/ntfs3/ntfs_fs.h:1102 [inline] ni_clear+0x32e/0x3e0 fs/ntfs3/frecord.c:133 evict+0x2a4/0x620 fs/inode.c:664 ntfs_extend_init+0x2fd/0x5a0 fs/ntfs3/fsntfs.c:228 ntfs_fill_super+0x3ff4/0x4370 fs/ntfs3/super.c:1243 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x2b/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488 __call_rcu_common kernel/rcu/tree.c:2753 [inline] call_rcu+0x163/0xa70 kernel/rcu/tree.c:2866 wg_noise_keypair_put drivers/net/wireguard/noise.c:139 [inline] add_new_keypair drivers/net/wireguard/noise.c:237 [inline] wg_noise_handshake_begin_session+0x936/0xdd0 drivers/net/wireguard/noise.c:845 wg_receive_handshake_packet+0x3ec/0x9c0 drivers/net/wireguard/receive.c:176 wg_packet_handshake_receive_worker+0x243/0x4f0 drivers/net/wireguard/receive.c:213 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff8880426f6000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 40 bytes inside of 2048-byte region [ffff8880426f6000, ffff8880426f6800) The buggy address belongs to the physical page: page:ffffea000109bc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x426f0 head:ffffea000109bc00 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012c42000 dead000000000100 dead000000000122 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5344, tgid 5344 (syz-executor.4), ts 152143358063, free_ts 11435697119 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x25b/0x340 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] pskb_expand_head+0x18a/0x1210 net/core/skbuff.c:1899 netlink_trim+0x17f/0x210 net/netlink/af_netlink.c:1312 netlink_broadcast+0x64/0x1170 net/netlink/af_netlink.c:1508 nlmsg_multicast include/net/netlink.h:1082 [inline] nlmsg_notify+0xfa/0x1c0 net/netlink/af_netlink.c:2607 __dev_notify_flags+0xf9/0x5e0 net/core/dev.c:8565 rtnl_configure_link+0x221/0x330 veth_newlink+0x764/0xd10 drivers/net/veth.c:1776 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline] __rtnl_newlink net/core/rtnetlink.c:3624 [inline] rtnl_newlink+0x14b3/0x2020 net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x822/0xf10 net/core/rtnetlink.c:6141 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 free_contig_range+0xa3/0x160 mm/page_alloc.c:9485 destroy_args+0xfe/0x935 mm/debug_vm_pgtable.c:998 debug_vm_pgtable+0x43d/0x496 mm/debug_vm_pgtable.c:1318 do_one_initcall+0x1d1/0x410 init/main.c:1306 do_initcall_level+0x168/0x218 init/main.c:1379 do_initcalls+0x43/0x84 init/main.c:1395 kernel_init_freeable+0x428/0x5d5 init/main.c:1634 kernel_init+0x19/0x2b0 init/main.c:1522 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff8880426f5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880426f5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880426f6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880426f6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880426f6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================