================================================================== BUG: KMSAN: kernel-infoleak in __copy_to_user include/linux/uaccess.h:121 [inline] BUG: KMSAN: kernel-infoleak in __kvm_write_guest_page arch/x86/kvm/../../../virt/kvm/kvm_main.c:1849 [inline] BUG: KMSAN: kernel-infoleak in kvm_vcpu_write_guest_page+0x383/0x500 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1870 CPU: 0 PID: 7992 Comm: syz-executor0 Not tainted 4.19.0-rc8+ #71 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+0x306/0x460 lib/dump_stack.c:113 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917 kmsan_internal_check_memory+0x374/0x460 mm/kmsan/kmsan.c:997 kmsan_copy_to_user+0x89/0xe0 mm/kmsan/kmsan_hooks.c:552 __copy_to_user include/linux/uaccess.h:121 [inline] __kvm_write_guest_page arch/x86/kvm/../../../virt/kvm/kvm_main.c:1849 [inline] kvm_vcpu_write_guest_page+0x383/0x500 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1870 kvm_vcpu_write_guest+0x1d6/0x350 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1904 kvm_write_guest_virt_helper arch/x86/kvm/x86.c:4949 [inline] emulator_write_std+0x391/0x4d0 arch/x86/kvm/x86.c:4973 segmented_write_std arch/x86/kvm/emulate.c:853 [inline] em_fxsave+0x7a6/0x830 arch/x86/kvm/emulate.c:4064 x86_emulate_insn+0x2d48/0xa5b0 arch/x86/kvm/emulate.c:5592 x86_emulate_instruction+0x14e6/0x6360 arch/x86/kvm/x86.c:6237 kvm_mmu_page_fault+0xd24/0x2ae0 arch/x86/kvm/mmu.c:5296 handle_ept_violation+0x7e1/0x820 arch/x86/kvm/vmx.c:7693 vmx_handle_exit+0x20f5/0xb900 arch/x86/kvm/vmx.c:10133 vcpu_enter_guest arch/x86/kvm/x86.c:7667 [inline] vcpu_run arch/x86/kvm/x86.c:7730 [inline] kvm_arch_vcpu_ioctl_run+0xa22b/0x10ab0 arch/x86/kvm/x86.c:7930 kvm_vcpu_ioctl+0x11a7/0x20b0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2590 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0xf28/0x2ca0 fs/ioctl.c:687 ksys_ioctl fs/ioctl.c:702 [inline] __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:707 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:707 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 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:00007f047bde6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f047bde76d4 R13: 00000000004c0274 R14: 00000000004d05c0 R15: 00000000ffffffff Local variable description: ----fx_state@em_fxsave Variable was created at: em_fxsave+0xcb/0x830 arch/x86/kvm/emulate.c:4051 x86_emulate_insn+0x2d48/0xa5b0 arch/x86/kvm/emulate.c:5592 Bytes 0-159 of 160 are uninitialized Memory access of size 160 starts at ffff88012afeedd0 ==================================================================