================================================================== 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 48 at addr ffff88807d5f8008 by task syz-executor.4/9603 CPU: 0 PID: 9603 Comm: syz-executor.4 Not tainted 6.9.0-rc2-next-20240403-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: 0033:0x7fa9af07dde9 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:00007fa9afdb60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007fa9af1abf80 RCX: 00007fa9af07dde9 RDX: 0000000000000400 RSI: 0000000020001f80 RDI: ffffffffffffffff RBP: 00007fa9af0ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fa9af1abf80 R15: 00007ffeffe9d898 Allocated by task 9603: 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:4069 [inline] __kmalloc_noprof+0x200/0x410 mm/slub.c:4082 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 ffff88807d5f8000 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes inside of allocated 48-byte region [ffff88807d5f8000, ffff88807d5f8030) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d5f8 anon flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff888015041640 0000000000000000 dead000000000001 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5110, tgid -1835181908 (syz-executor.1), ts 5110, free_ts 79763481857 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+0xcd1/0x14b0 mm/slub.c:3615 __slab_alloc+0x58/0xa0 mm/slub.c:3705 __slab_alloc_node mm/slub.c:3758 [inline] slab_alloc_node mm/slub.c:3936 [inline] kmalloc_trace_noprof+0x1d5/0x2b0 mm/slub.c:4095 kmalloc_noprof include/linux/slab.h:660 [inline] netdev_name_node_alloc net/core/dev.c:265 [inline] netdev_name_node_head_alloc net/core/dev.c:279 [inline] register_netdevice+0x4e2/0x1a10 net/core/dev.c:10267 veth_newlink+0x628/0xcd0 drivers/net/veth.c:1828 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 5121 tgid 5121 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1110 [inline] free_unref_page+0xd3c/0xec0 mm/page_alloc.c:2617 tlb_batch_list_free mm/mmu_gather.c:159 [inline] tlb_finish_mmu+0x11f/0x200 mm/mmu_gather.c:468 exit_mmap+0x44f/0xc80 mm/mmap.c:3325 __mmput+0x115/0x3c0 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:569 do_exit+0x99e/0x27e0 kernel/exit.c:865 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a Memory state around the buggy address: ffff88807d5f7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807d5f7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807d5f8000: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff88807d5f8080: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88807d5f8100: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================