================================================================== BUG: KASAN: slab-out-of-bounds in instrument_copy_from_user_before include/linux/instrumented.h:129 [inline] BUG: KASAN: slab-out-of-bounds in _copy_from_user+0x7b/0xe0 lib/usercopy.c:22 Write of size 83 at addr ffff8881407c6688 by task syz-executor.3/6259 CPU: 1 PID: 6259 Comm: syz-executor.3 Not tainted 6.9.0-rc2-next-20240402-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_copy_from_user_before include/linux/instrumented.h:129 [inline] _copy_from_user+0x7b/0xe0 lib/usercopy.c:22 copy_from_user include/linux/uaccess.h:183 [inline] handle_to_path fs/fhandle.c:203 [inline] do_handle_open+0x204/0x660 fs/fhandle.c:226 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7fdf4027dde9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdf40f690c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007fdf403abf80 RCX: 00007fdf4027dde9 RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 RBP: 00007fdf402ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fdf403abf80 R15: 00007ffff6eb6128 Allocated by task 6259: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4048 [inline] __kmalloc_noprof+0x200/0x410 mm/slub.c:4061 kmalloc_noprof include/linux/slab.h:664 [inline] handle_to_path fs/fhandle.c:195 [inline] do_handle_open+0x162/0x660 fs/fhandle.c:226 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a The buggy address belongs to the object at ffff8881407c6680 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 8 bytes inside of allocated 83-byte region [ffff8881407c6680, ffff8881407c66d3) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1407c6 anon flags: 0x57ff80000000000(node=1|zone=2|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 057ff80000000000 ffff888015041780 ffffea000508b040 dead000000000005 raw: 0000000000000000 0000000080200020 00000001ffffefff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5453, tgid 1954416247 (syz-executor.3), ts 5453, free_ts 17020156287 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1490 prep_new_page mm/page_alloc.c:1498 [inline] get_page_from_freelist+0x2e7e/0x2f40 mm/page_alloc.c:3454 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4712 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline] alloc_pages_node_noprof include/linux/gfp.h:271 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2249 allocate_slab+0x5a/0x2e0 mm/slub.c:2412 new_slab mm/slub.c:2465 [inline] ___slab_alloc+0xea8/0x1430 mm/slub.c:3599 __slab_alloc+0x58/0xa0 mm/slub.c:3684 __slab_alloc_node mm/slub.c:3737 [inline] slab_alloc_node mm/slub.c:3915 [inline] kmalloc_node_trace_noprof+0x20c/0x300 mm/slub.c:4087 kmalloc_node_noprof include/linux/slab.h:677 [inline] alloc_node_nr_active kernel/workqueue.c:4819 [inline] alloc_workqueue+0x854/0x20d0 kernel/workqueue.c:5699 wg_newlink+0x208/0x640 drivers/net/wireguard/device.c:338 rtnl_newlink_create net/core/rtnetlink.c:3494 [inline] __rtnl_newlink net/core/rtnetlink.c:3714 [inline] rtnl_newlink+0x158f/0x20a0 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x89b/0x10d0 net/core/rtnetlink.c:6594 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2559 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_folios+0xf23/0x19e0 mm/page_alloc.c:2666 folios_put_refs+0x93a/0xa60 mm/swap.c:1034 folio_batch_release include/linux/pagevec.h:101 [inline] truncate_inode_pages_range+0x47b/0xfc0 mm/truncate.c:362 kill_bdev block/bdev.c:85 [inline] blkdev_flush_mapping+0x156/0x2b0 block/bdev.c:644 blkdev_put_whole block/bdev.c:675 [inline] bdev_release+0x489/0x720 block/bdev.c:1066 blkdev_release+0x15/0x20 block/fops.c:628 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 init_flush_fput init/do_mounts.h:51 [inline] mount_root_generic+0x1ca/0x3e0 init/do_mounts.c:212 prepare_namespace+0xc2/0x100 init/do_mounts.c:492 kernel_init_freeable+0x476/0x5d0 init/main.c:1582 kernel_init+0x1d/0x2b0 init/main.c:1458 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Memory state around the buggy address: ffff8881407c6580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8881407c6600: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8881407c6680: 00 00 00 00 00 00 00 00 00 00 03 fc fc fc fc fc ^ ffff8881407c6700: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff8881407c6780: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ==================================================================