From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81396C43613 for ; Sat, 22 Jun 2019 10:13:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5125B206B7 for ; Sat, 22 Jun 2019 10:13:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="DFALrcBr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726387AbfFVKN2 (ORCPT ); Sat, 22 Jun 2019 06:13:28 -0400 Received: from terminus.zytor.com ([198.137.202.136]:49669 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726138AbfFVKN1 (ORCPT ); Sat, 22 Jun 2019 06:13:27 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id x5MADK972097959 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Sat, 22 Jun 2019 03:13:20 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 terminus.zytor.com x5MADK972097959 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2019061801; t=1561198400; bh=RzdNB5kyxjyHy1NKN8iaDyUy1VHJEC9k9ScsNc4KmIQ=; h=Date:From:Cc:Reply-To:In-Reply-To:References:To:Subject:From; b=DFALrcBr1ORluVLHbMZEqo9BASNcCfK+0d1uRuE45o5B9ZR6CoQMSjKjoWzfRiVN3 RaLY9EcTAdbEcMXdqSew5JOa4h+iQQhNm8XCL1a2HsL8BLQ5QHV7/IMy7180ddWM7L r9ZFtxCiSeH9dqtI3Iin9bITvgIJiuWRM8E/+S2Dp8lwpAzLrWc+1fWNVGSS6G+/oT HA1y8MyStH/DbJP1aUvi2UpMNLP9oeXiaZCiX6BywnLRP0Wdkxep26sm9P3wqKub1i mem7x/LsyKsnFuMoGs02zWMQ4/rXlvouBDhwaNM64+3JUK4N4XEWc0VJE7vNYivSJ5 q3fKMo2+1iVhA== Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id x5MADJiL2097956; Sat, 22 Jun 2019 03:13:19 -0700 Date: Sat, 22 Jun 2019 03:13:19 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: "tip-bot for Chang S. Bae" Message-ID: Cc: ak@linux.intel.com, ravi.v.shankar@intel.com, linux-kernel@vger.kernel.org, chang.seok.bae@intel.com, luto@kernel.org, mingo@kernel.org, tglx@linutronix.de, hpa@zytor.com Reply-To: mingo@kernel.org, chang.seok.bae@intel.com, luto@kernel.org, ravi.v.shankar@intel.com, linux-kernel@vger.kernel.org, ak@linux.intel.com, tglx@linutronix.de, hpa@zytor.com In-Reply-To: <1557309753-24073-16-git-send-email-chang.seok.bae@intel.com> References: <1557309753-24073-16-git-send-email-chang.seok.bae@intel.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/cpu] selftests/x86/fsgsbase: Test ptracer-induced GSBASE write with FSGSBASE Git-Commit-ID: a87730cc3acc475eff12ddde3f7d5687371b5c76 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: a87730cc3acc475eff12ddde3f7d5687371b5c76 Gitweb: https://git.kernel.org/tip/a87730cc3acc475eff12ddde3f7d5687371b5c76 Author: Chang S. Bae AuthorDate: Wed, 8 May 2019 03:02:30 -0700 Committer: Thomas Gleixner CommitDate: Sat, 22 Jun 2019 11:38:56 +0200 selftests/x86/fsgsbase: Test ptracer-induced GSBASE write with FSGSBASE This validates that GS and GSBASE are independently preserved in ptracer commands. Suggested-by: Andy Lutomirski Signed-off-by: Chang S. Bae Signed-off-by: Thomas Gleixner Cc: Andi Kleen Cc: Ravi Shankar Cc: H. Peter Anvin Link: https://lkml.kernel.org/r/1557309753-24073-16-git-send-email-chang.seok.bae@intel.com --- tools/testing/selftests/x86/fsgsbase.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/x86/fsgsbase.c b/tools/testing/selftests/x86/fsgsbase.c index afd029897c79..21fd4f94b5b0 100644 --- a/tools/testing/selftests/x86/fsgsbase.c +++ b/tools/testing/selftests/x86/fsgsbase.c @@ -470,7 +470,7 @@ static void test_ptrace_write_gsbase(void) wait(&status); if (WSTOPSIG(status) == SIGTRAP) { - unsigned long gs; + unsigned long gs, base; unsigned long gs_offset = USER_REGS_OFFSET(gs); unsigned long base_offset = USER_REGS_OFFSET(gs_base); @@ -486,6 +486,7 @@ static void test_ptrace_write_gsbase(void) err(1, "PTRACE_POKEUSER"); gs = ptrace(PTRACE_PEEKUSER, child, gs_offset, NULL); + base = ptrace(PTRACE_PEEKUSER, child, base_offset, NULL); /* * In a non-FSGSBASE system, the nonzero selector will load @@ -496,8 +497,14 @@ static void test_ptrace_write_gsbase(void) if (gs != 0x7) { nerrs++; printf("[FAIL]\tGS changed to %lx\n", gs); + } else if (have_fsgsbase && (base != 0xFF)) { + nerrs++; + printf("[FAIL]\tGSBASE changed to %lx\n", base); } else { - printf("[OK]\tGS remained 0x7\n"); + printf("[OK]\tGS remained 0x7 %s"); + if (have_fsgsbase) + printf("and GSBASE changed to 0xFF"); + printf("\n"); } }