================================================================== 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 ffff8880a7698468 by task syz-executor.5/12349 CPU: 1 PID: 12349 Comm: syz-executor.5 Not tainted 5.6.0-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:8132 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] change_pmd_range mm/mprotect.c:247 [inline] change_pud_range mm/mprotect.c:297 [inline] change_p4d_range mm/mprotect.c:317 [inline] change_protection_range mm/mprotect.c:342 [inline] change_protection+0x1ed0/0x2710 mm/mprotect.c:365 mprotect_fixup+0x46c/0x940 mm/mprotect.c:487 do_mprotect_pkey+0x542/0x950 mm/mprotect.c:613 __do_sys_mprotect mm/mprotect.c:638 [inline] __se_sys_mprotect mm/mprotect.c:635 [inline] __x64_sys_mprotect+0x74/0xb0 mm/mprotect.c:635 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c987 Code: 00 00 00 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:0000000000c7fb08 EFLAGS: 00000246 ORIG_RAX: 000000000000000a RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 000000000045c987 RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00007fb387031000 RBP: 0000000000c7fbf0 R08: 00000000007217e0 R09: 00000000007217e0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000c7fce0 R13: 00007fb387051700 R14: 00007fb3870519c0 R15: 000000000076bfac Allocated by task 12350: 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:739 [inline] kvzalloc include/linux/mm.h:747 [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+0x678/0x23e0 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 11968: 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+0xb04/0x2dd0 kernel/exit.c:790 do_group_exit+0x125/0x340 kernel/exit.c:893 get_signal+0x47b/0x24e0 kernel/signal.c:2739 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff8880a7698000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1128 bytes inside of 2048-byte region [ffff8880a7698000, ffff8880a7698800) The buggy address belongs to the page: page:ffffea00029da600 refcount:1 mapcount:0 mapping:00000000caab477d index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00026192c8 ffffea0002577388 ffff8880aa000e00 raw: 0000000000000000 ffff8880a7698000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7698300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a7698380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a7698400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ^ ffff8880a7698480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a7698500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================