================================================================== BUG: KASAN: slab-out-of-bounds in search_memslots include/linux/kvm_host.h:1051 [inline] BUG: KASAN: slab-out-of-bounds in __gfn_to_memslot include/linux/kvm_host.h:1063 [inline] BUG: KASAN: slab-out-of-bounds in __kvm_gfn_to_hva_cache_init+0x5fb/0x670 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2443 Read of size 8 at addr ffff888094f21468 by task syz-executor.4/13802 CPU: 1 PID: 13802 Comm: syz-executor.4 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:382 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511 kasan_report+0x33/0x50 mm/kasan/common.c:625 search_memslots include/linux/kvm_host.h:1051 [inline] __gfn_to_memslot include/linux/kvm_host.h:1063 [inline] __kvm_gfn_to_hva_cache_init+0x5fb/0x670 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2443 kvm_lapic_set_vapic_addr+0x88/0x180 arch/x86/kvm/lapic.c:2662 kvm_arch_vcpu_ioctl+0xf0d/0x2c00 arch/x86/kvm/x86.c:4386 kvm_vcpu_ioctl+0x866/0xe60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3291 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6e7f20fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e8740 RCX: 000000000045ca29 RDX: 0000000020000000 RSI: 000000004008ae93 RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003e4 R14: 00000000004c697c R15: 00007f6e7f2106d4 Allocated by task 13809: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:757 [inline] kvzalloc include/linux/mm.h:765 [inline] kvm_dup_memslots arch/x86/kvm/../../../virt/kvm/kvm_main.c:1101 [inline] kvm_set_memslot+0x115/0x1530 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1118 __kvm_set_memory_region+0xcf7/0x1320 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1300 __x86_set_memory_region+0x2a3/0x5a0 arch/x86/kvm/x86.c:9856 alloc_apic_access_page arch/x86/kvm/vmx/vmx.c:3540 [inline] vmx_create_vcpu+0x2107/0x2b40 arch/x86/kvm/vmx/vmx.c:6799 kvm_arch_vcpu_create+0x6ef/0xb80 arch/x86/kvm/x86.c:9376 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3030 [inline] kvm_vm_ioctl+0x1614/0x2400 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3585 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 13262: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 neigh_sysctl_unregister+0x63/0x80 net/core/neighbour.c:3714 inetdev_destroy net/ipv4/devinet.c:323 [inline] inetdev_event+0x1191/0x15b0 net/ipv4/devinet.c:1598 notifier_call_chain+0xc0/0x230 kernel/notifier.c:83 call_netdevice_notifiers_info net/core/dev.c:1948 [inline] call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1933 call_netdevice_notifiers_extack net/core/dev.c:1960 [inline] call_netdevice_notifiers net/core/dev.c:1974 [inline] rollback_registered_many+0x75c/0xe70 net/core/dev.c:8828 unregister_netdevice_many.part.0+0x16/0x1e0 net/core/dev.c:9988 unregister_netdevice_many+0x36/0x50 net/core/dev.c:9987 rtnl_delete_link+0xdb/0x130 net/core/rtnetlink.c:2947 rtnl_dellink+0x311/0x980 net/core/rtnetlink.c:2999 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff888094f21000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1128 bytes inside of 2048-byte region [ffff888094f21000, ffff888094f21800) The buggy address belongs to the page: page:ffffea000253c840 refcount:1 mapcount:0 mapping:000000002f384296 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00022c1b48 ffffea00027bb308 ffff8880aa000e00 raw: 0000000000000000 ffff888094f21000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888094f21300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888094f21380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888094f21400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ^ ffff888094f21480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888094f21500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================