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BUG: KMSAN: kernel-infoleak in __copy_to_user include/linux/uaccess.h:118 [inline]
BUG: KMSAN: kernel-infoleak in __kvm_write_guest_page+0x2cb/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1938
CPU: 1 PID: 21817 Comm: syz-executor.1 Not tainted 5.1.0+ #1
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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x130/0x2a0 mm/kmsan/kmsan.c:622
 kmsan_internal_check_memory+0x974/0xa80 mm/kmsan/kmsan.c:716
 kmsan_copy_to_user+0xa9/0xb0 mm/kmsan/kmsan_hooks.c:493
 __copy_to_user include/linux/uaccess.h:118 [inline]
 __kvm_write_guest_page+0x2cb/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1938
 kvm_vcpu_write_guest_page+0x5f8/0x630 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1959
 kvm_vcpu_write_guest+0x1e0/0x360 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1993
 kvm_write_guest_virt_helper arch/x86/kvm/x86.c:5190 [inline]
 emulator_write_std+0x391/0x4d0 arch/x86/kvm/x86.c:5214
 segmented_write_std arch/x86/kvm/emulate.c:853 [inline]
 em_fxsave+0x7c8/0x850 arch/x86/kvm/emulate.c:4086
 x86_emulate_insn+0x1ffd/0xa800 arch/x86/kvm/emulate.c:5614
 x86_emulate_instruction+0x101b/0x7180 arch/x86/kvm/x86.c:6468
 kvm_mmu_page_fault+0xce4/0x2950 arch/x86/kvm/mmu.c:5419
 handle_ept_violation+0x478/0x4e0 arch/x86/kvm/vmx/vmx.c:5094
 vmx_handle_exit+0x1280/0x20c0 arch/x86/kvm/vmx/vmx.c:5839
 vcpu_enter_guest arch/x86/kvm/x86.c:7972 [inline]
 vcpu_run arch/x86/kvm/x86.c:8036 [inline]
 kvm_arch_vcpu_ioctl_run+0x9cbf/0x10920 arch/x86/kvm/x86.c:8236
 kvm_vcpu_ioctl+0x10ab/0x1d10 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2684
 do_vfs_ioctl+0xea8/0x2c50 fs/ioctl.c:46
 ksys_ioctl fs/ioctl.c:713 [inline]
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718
 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x459279
Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbadf370c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbadf3716d4
R13: 00000000004c235a R14: 00000000004d5050 R15: 00000000ffffffff

Local variable description: ----fx_state@em_fxsave
Variable was created at:
 check_fxsr arch/x86/kvm/emulate.c:4014 [inline]
 em_fxsave+0x5c/0x850 arch/x86/kvm/emulate.c:4077
 x86_emulate_insn+0x1ffd/0xa800 arch/x86/kvm/emulate.c:5614

Bytes 8-159 of 160 are uninitialized
Memory access of size 160 starts at ffff88801383ee00
Data copied to user address 0000000020000000
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