================================================================== BUG: KASAN: use-after-free in mark_page_dirty_in_slot arch/x86/kvm/../../../virt/kvm/kvm_main.c:2056 [inline] BUG: KASAN: use-after-free in kvm_write_guest_offset_cached+0x693/0x6b0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1988 Read of size 8 at addr ffff88817e185560 by task syz-executor1/10397 CPU: 0 PID: 10397 Comm: syz-executor1 Not tainted 4.20.0-rc5+ #362 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 mark_page_dirty_in_slot arch/x86/kvm/../../../virt/kvm/kvm_main.c:2056 [inline] kvm_write_guest_offset_cached+0x693/0x6b0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1988 kvm_steal_time_set_preempted arch/x86/kvm/x86.c:3241 [inline] kvm_arch_vcpu_put+0x365/0x420 arch/x86/kvm/x86.c:3268 kvm_sched_out+0x91/0xb0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3993 __fire_sched_out_preempt_notifiers kernel/sched/core.c:2503 [inline] fire_sched_out_preempt_notifiers kernel/sched/core.c:2511 [inline] prepare_task_switch kernel/sched/core.c:2617 [inline] context_switch kernel/sched/core.c:2796 [inline] __schedule+0x103d/0x21d0 kernel/sched/core.c:3472 preempt_schedule_irq+0xb9/0x140 kernel/sched/core.c:3699 retint_kernel+0x1b/0x2d RIP: 0010:search_memslots include/linux/kvm_host.h:947 [inline] RIP: 0010:__gfn_to_memslot include/linux/kvm_host.h:976 [inline] RIP: 0010:__kvm_gfn_to_hva_cache_init+0x1c5/0xd10 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1935 Code: fc ff df 48 89 ca 48 89 8d 38 fe ff ff 48 c1 ea 03 0f b6 14 02 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 62 09 00 00 <48> 8b 85 68 fe ff ff be 04 00 00 00 48 8d b8 08 b4 00 00 44 8b b8 RSP: 0018:ffff88818313f238 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffff88817e8d060c RDX: 0000000000000000 RSI: ffffffff810795eb RDI: ffff88817d95c7e8 RBP: ffff88818313f428 R08: ffff88817ccda500 R09: fffff5200247e6d7 R10: fffff5200247e6d7 R11: ffffc900123f36bb R12: 0000000000000040 R13: ffffffffffffffca R14: 0000000000000040 R15: ffff88817d95c7d0 kvm_read_guest_cached+0x33f/0x5b0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2010 record_steal_time arch/x86/kvm/x86.c:2380 [inline] vcpu_enter_guest arch/x86/kvm/x86.c:7581 [inline] vcpu_run arch/x86/kvm/x86.c:7874 [inline] kvm_arch_vcpu_ioctl_run+0x501d/0x7320 arch/x86/kvm/x86.c:8074 kvm_vcpu_ioctl+0x5c8/0x1150 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2596 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1c5f2b4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 000000000000000c RBP: 000000000072c220 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1c5f2b56d4 R13: 00000000004c034e R14: 00000000004d0d60 R15: 00000000ffffffff Allocated by task 10389: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3684 [inline] __kmalloc_node+0x50/0x70 mm/slab.c:3691 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0xb9/0xf0 mm/util.c:416 kvmalloc include/linux/mm.h:577 [inline] kvzalloc include/linux/mm.h:585 [inline] __kvm_set_memory_region+0x116e/0x2d50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1023 kvm_set_memory_region+0x2e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1085 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1097 [inline] kvm_vm_ioctl+0x652/0x1d60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2995 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 10389: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 kvfree+0x61/0x70 mm/util.c:445 __kvm_set_memory_region+0x1cb3/0x2d50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1067 kvm_set_memory_region+0x2e/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1085 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1097 [inline] kvm_vm_ioctl+0x652/0x1d60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2995 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88817e184ec0 which belongs to the cache kmalloc-64k of size 65536 The buggy address is located 1696 bytes inside of 65536-byte region [ffff88817e184ec0, ffff88817e194ec0) The buggy address belongs to the page: page:ffffea0005f86000 count:1 mapcount:0 mapping:ffff8881da802500 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000010200(slab|head) raw: 02fffc0000010200 ffffea0005f4c808 ffffea0005f7d808 ffff8881da802500 raw: 0000000000000000 ffff88817e184ec0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88817e185400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88817e185480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88817e185500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88817e185580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88817e185600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================