================================================================== 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 gfn_to_memslot arch/x86/kvm/../../../virt/kvm/kvm_main.c:1597 [inline] BUG: KASAN: slab-out-of-bounds in gfn_to_hva+0x4a0/0x4c0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1677 Read of size 8 at addr ffff888093e55468 by task syz-executor.3/10894 CPU: 1 PID: 10894 Comm: syz-executor.3 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] gfn_to_memslot arch/x86/kvm/../../../virt/kvm/kvm_main.c:1597 [inline] gfn_to_hva+0x4a0/0x4c0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1677 kvm_arch_mmu_notifier_invalidate_range+0x21/0x80 arch/x86/kvm/x86.c:8142 kvm_mmu_notifier_invalidate_range_start+0x1a1/0x280 arch/x86/kvm/../../../virt/kvm/kvm_main.c:421 mn_hlist_invalidate_range_start mm/mmu_notifier.c:493 [inline] __mmu_notifier_invalidate_range_start+0x4bc/0x6b0 mm/mmu_notifier.c:525 mmu_notifier_invalidate_range_start include/linux/mmu_notifier.h:446 [inline] __split_huge_pmd+0xfb4/0x2cc0 mm/huge_memory.c:2393 split_huge_pmd_address+0x21f/0x290 mm/huge_memory.c:2451 vma_adjust_trans_huge+0x27b/0x2f0 mm/huge_memory.c:2467 __vma_adjust+0x180/0x1c50 mm/mmap.c:794 vma_adjust include/linux/mm.h:2476 [inline] __split_vma+0x471/0x560 mm/mmap.c:2707 __do_munmap+0xe2c/0x10e0 mm/mmap.c:2806 do_munmap mm/mmap.c:2859 [inline] mmap_region+0x1ef/0x1530 mm/mmap.c:1715 do_mmap+0x849/0x1160 mm/mmap.c:1545 do_mmap_pgoff include/linux/mm.h:2555 [inline] vm_mmap_pgoff+0x197/0x200 mm/util.c:506 ksys_mmap_pgoff+0x457/0x5b0 mm/mmap.c:1595 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 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:00007fcf6eb7dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000004f5b60 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020000000 RBP: 000000000078bf00 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000010012 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000073e R14: 00000000004c9ff5 R15: 00007fcf6eb7e6d4 Allocated by task 10894: 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 kvm_set_memory_region+0x29/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1321 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1333 [inline] kvm_vm_ioctl+0x678/0x2400 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3604 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 9626: 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 kvfree+0x42/0x50 mm/util.c:603 __free_fdtable+0x2d/0x70 fs/file.c:31 put_files_struct fs/file.c:420 [inline] put_files_struct+0x248/0x2e0 fs/file.c:413 exit_files+0x7e/0xa0 fs/file.c:445 do_exit+0xb24/0x2e10 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 __do_sys_exit_group kernel/exit.c:904 [inline] __se_sys_exit_group kernel/exit.c:902 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:902 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 ffff888093e55000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1128 bytes inside of 2048-byte region [ffff888093e55000, ffff888093e55800) The buggy address belongs to the page: page:ffffea00024f9540 refcount:1 mapcount:0 mapping:00000000add787b1 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002529408 ffffea00029e4fc8 ffff8880aa000e00 raw: 0000000000000000 ffff888093e55000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888093e55300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888093e55380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888093e55400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ^ ffff888093e55480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888093e55500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================