From: Dmitry Vyukov Date: Tue, 17 Jan 2017 13:51:04 +0000 (+0100) Subject: KVM: x86: fix fixing of hypercalls X-Git-Tag: v4.14-rc1~1662^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ce2e852ecc9a42e4b8dabb46025cfef63209234a;p=platform%2Fkernel%2Flinux-rpi.git KVM: x86: fix fixing of hypercalls emulator_fix_hypercall() replaces hypercall with vmcall instruction, but it does not handle GP exception properly when writes the new instruction. It can return X86EMUL_PROPAGATE_FAULT without setting exception information. This leads to incorrect emulation and triggers WARN_ON(ctxt->exception.vector > 0x1f) in x86_emulate_insn() as discovered by syzkaller fuzzer: WARNING: CPU: 2 PID: 18646 at arch/x86/kvm/emulate.c:5558 Call Trace: warn_slowpath_null+0x2c/0x40 kernel/panic.c:582 x86_emulate_insn+0x16a5/0x4090 arch/x86/kvm/emulate.c:5572 x86_emulate_instruction+0x403/0x1cc0 arch/x86/kvm/x86.c:5618 emulate_instruction arch/x86/include/asm/kvm_host.h:1127 [inline] handle_exception+0x594/0xfd0 arch/x86/kvm/vmx.c:5762 vmx_handle_exit+0x2b7/0x38b0 arch/x86/kvm/vmx.c:8625 vcpu_enter_guest arch/x86/kvm/x86.c:6888 [inline] vcpu_run arch/x86/kvm/x86.c:6947 [inline] Set exception information when write in emulator_fix_hypercall() fails. Signed-off-by: Dmitry Vyukov Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Wanpeng Li Cc: kvm@vger.kernel.org Cc: syzkaller@googlegroups.com Signed-off-by: Radim Krčmář --- diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 57d8a85..d153be8 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6171,7 +6171,8 @@ static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt) kvm_x86_ops->patch_hypercall(vcpu, instruction); - return emulator_write_emulated(ctxt, rip, instruction, 3, NULL); + return emulator_write_emulated(ctxt, rip, instruction, 3, + &ctxt->exception); } static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)