From patchwork Sun Jul 31 20:46:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michal Luczaj X-Patchwork-Id: 12933270 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A3A3C00140 for ; Sun, 31 Jul 2022 20:47:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238401AbiGaUrZ (ORCPT ); Sun, 31 Jul 2022 16:47:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48880 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237966AbiGaUrX (ORCPT ); Sun, 31 Jul 2022 16:47:23 -0400 Received: from mailtransmit04.runbox.com (mailtransmit04.runbox.com [IPv6:2a0c:5a00:149::25]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF92065E8 for ; Sun, 31 Jul 2022 13:47:22 -0700 (PDT) Received: from mailtransmit02.runbox ([10.9.9.162] helo=aibo.runbox.com) by mailtransmit04.runbox.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1oIFqK-009y9n-2t; Sun, 31 Jul 2022 22:47:20 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=rbox.co; s=selector1; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From; bh=OJvpmkIiGFZf9HswNPNYoGPHO87+nnPmBO1JM9Pvekc=; b=jvez0LykETh0j446Pbsa4cXgOK B9U/K0fIicboHZqq+3H+hsSBjBNyVV9GDumhvxRGq8mzjlf86oU5qXYTIi0tUlr1BWUyzBDAIdFmj YECoA5VI5X0MJKbGQ3A2xDLmSp/9EERHE48UGCgNCoBDkOqdrIHtKl33Z2R3V33108F2YhWRuzbT9 BzUxMgeHPIy9ctBirjv3pgfCmtavNtUbZTcdf/pWJ887RkH/mfT6tFPBZG6R/BBJzI/7yuxIkR5IX DjR0xi+yBcgWWjNgBHDhEPCxgkW68g3Ejbkp/p1ReMBLIaK+NAtRjnxPkrEv1Guuk3EWVt1bDbdN8 3QV1FZGw==; Received: from [10.9.9.74] (helo=submission03.runbox) by mailtransmit02.runbox with esmtp (Exim 4.86_2) (envelope-from ) id 1oIFqJ-0005Eu-L7; Sun, 31 Jul 2022 22:47:19 +0200 Received: by submission03.runbox with esmtpsa [Authenticated ID (604044)] (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) id 1oIFqE-0006K8-4k; Sun, 31 Jul 2022 22:47:14 +0200 From: Michal Luczaj To: seanjc@google.com Cc: kvm@vger.kernel.org, pbonzini@redhat.com, shuah@kernel.org, linux-kselftest@vger.kernel.org, Michal Luczaj Subject: [kvm-unit-tests PATCH v2] x86: Test illegal LEA handling Date: Sun, 31 Jul 2022 22:46:53 +0200 Message-Id: <20220731204653.2516-1-mhal@rbox.co> X-Mailer: git-send-email 2.32.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Check if the emulator throws #UD on illegal LEA. Suggested-by: Sean Christopherson Signed-off-by: Michal Luczaj --- v1 -> v2: Instead of racing decoder make use of force_emulation_prefix x86/emulator.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/x86/emulator.c b/x86/emulator.c index cd78e3c..c3898f2 100644 --- a/x86/emulator.c +++ b/x86/emulator.c @@ -895,6 +895,24 @@ static void test_mov_dr(uint64_t *mem) report(rax == DR6_ACTIVE_LOW, "mov_dr6"); } +static void illegal_lea_handler(struct ex_regs *regs) +{ + extern char illegal_lea_cont; + + ++exceptions; + regs->rip = (ulong)&illegal_lea_cont; +} + +static void test_illegal_lea(uint64_t *mem) +{ + exceptions = 0; + handle_exception(UD_VECTOR, illegal_lea_handler); + asm(KVM_FEP ".byte 0x48; .byte 0x8d; .byte 0xc0\n\t" + "illegal_lea_cont:" : : : "rax"); + report(exceptions == 1, "illegal lea"); + handle_exception(UD_VECTOR, 0); +} + static void test_push16(uint64_t *mem) { uint64_t rsp1, rsp2; @@ -1193,6 +1211,7 @@ int main(void) test_smsw_reg(mem); test_nop(mem); test_mov_dr(mem); + test_illegal_lea(mem); } else { report_skip("skipping register-only tests, " "use kvm.force_emulation_prefix=1 to enable");