================================================================== 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 36 at addr ffff88801fea5308 by task syz-executor.1/12072 CPU: 0 PID: 12072 Comm: syz-executor.1 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: 0033:0x7fd6e467dde9 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:00007fd6e53b50c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007fd6e47ac120 RCX: 00007fd6e467dde9 RDX: 0000000000000000 RSI: 00000000200021c0 RDI: ffffffffffffffff RBP: 00007fd6e46ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fd6e47ac120 R15: 00007ffef919dfc8 Allocated by task 12072: 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 ffff88801fea5300 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes inside of allocated 36-byte region [ffff88801fea5300, ffff88801fea5324) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fea5 ksm flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffefff(slab) raw: 00fff80000000000 ffff888015041640 ffffea000065ed00 dead000000000003 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 2, tgid -576134745 (kthreadd), ts 2, free_ts 156367396029 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] __do_kmalloc_node mm/slub.c:4047 [inline] __kmalloc_noprof+0x25e/0x410 mm/slub.c:4061 kmalloc_noprof include/linux/slab.h:664 [inline] kzalloc_noprof include/linux/slab.h:775 [inline] lsm_task_alloc security/security.c:691 [inline] security_task_alloc+0x43/0x130 security/security.c:3011 copy_process+0x169e/0x3dc0 kernel/fork.c:2371 kernel_clone+0x226/0x8f0 kernel/fork.c:2796 kernel_thread+0x1bc/0x240 kernel/fork.c:2858 create_kthread kernel/kthread.c:411 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:764 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 page last free pid 7314 tgid 7314 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 vfree+0x186/0x2e0 mm/vmalloc.c:3339 kvm_arch_free_memslot+0x143/0x170 arch/x86/kvm/x86.c:12746 kvm_free_memslot arch/x86/kvm/../../../virt/kvm/kvm_main.c:1035 [inline] kvm_free_memslots+0x146/0x1f0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1056 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1388 [inline] kvm_put_kvm+0xf0a/0x1300 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1420 kvm_vcpu_release+0x57/0x70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4188 __fput+0x429/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close fs/open.c:1541 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1541 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a Memory state around the buggy address: ffff88801fea5200: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801fea5280: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88801fea5300: 00 00 00 00 04 fc fc fc fc fc fc fc fc fc fc fc ^ ffff88801fea5380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88801fea5400: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================