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=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 B5026C433E1 for ; Wed, 22 Jul 2020 05:55:06 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5F97120771 for ; Wed, 22 Jul 2020 05:55:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ellerman.id.au header.i=@ellerman.id.au header.b="l7d9EYRi" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5F97120771 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4BBPnM5TBjzDqLd for ; Wed, 22 Jul 2020 15:55:03 +1000 (AEST) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4BBPlL4rZPzDqLd for ; Wed, 22 Jul 2020 15:53:18 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=l7d9EYRi; dkim-atps=neutral Received: by ozlabs.org (Postfix) id 4BBPlL3dqtz9sPB; Wed, 22 Jul 2020 15:53:18 +1000 (AEST) Received: by ozlabs.org (Postfix, from userid 1034) id 4BBPlL2rclz9sRN; Wed, 22 Jul 2020 15:53:18 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ellerman.id.au; s=201909; t=1595397198; bh=J6Oyelo4ndRmF79lExjeI93zEWZs53TowxpRUWU0e1E=; h=From:To:Subject:Date:From; b=l7d9EYRi8LYBAEKp7v4jRcrqOBdkfqzMgELLv6jw1hbVTHLa6xHbV8rAmj1SyQiOr Li5vTmY6LgRd5u1XHWDHt4nalEUt5/9Mrhnw4O4qM+A1FMAP/HyzAIGdUc92HVZg3g o5ZVtC19Xmopt7SCCpVn2HsD9CBMX+XNgZHbwjM21oA9P5e1h3W7DRBoVWxGU42aPh yA7qNJDTjev9mDda3KOZSe/MlIPFiKB13POBz31zqZa7CWbJI/yTBbwTChm/7RZu9i PZwxT76kJWjo2mO7X3Rj3MkAbC2L+6FwSQ4gLz1t40oPg3L8mQhuTq9EXqQD+ZzJ8E S40MYj7WbuwuQ== From: Michael Ellerman To: linuxppc-dev@ozlabs.org Subject: [PATCH] selftests/powerpc: Add test of memcmp at end of page Date: Wed, 22 Jul 2020 15:53:15 +1000 Message-Id: <20200722055315.962391-1-mpe@ellerman.id.au> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Update our memcmp selftest, to test the case where we're comparing up to the end of a page and the subsequent page is not mapped. We have to make sure we don't read off the end of the page and cause a fault. We had a bug there in the past, fixed in commit d9470757398a ("powerpc/64: Fix memcmp reading past the end of src/dest"). Signed-off-by: Michael Ellerman --- .../selftests/powerpc/stringloops/memcmp.c | 40 ++++++++++--------- 1 file changed, 22 insertions(+), 18 deletions(-) diff --git a/tools/testing/selftests/powerpc/stringloops/memcmp.c b/tools/testing/selftests/powerpc/stringloops/memcmp.c index b1fa7546957f..e4605ca850dc 100644 --- a/tools/testing/selftests/powerpc/stringloops/memcmp.c +++ b/tools/testing/selftests/powerpc/stringloops/memcmp.c @@ -2,6 +2,7 @@ #include #include #include +#include #include #include "utils.h" @@ -13,6 +14,9 @@ #define LARGE_MAX_OFFSET 32 #define LARGE_SIZE_START 4096 +/* This is big enough to fit LARGE_SIZE and works on 4K & 64K kernels */ +#define MAP_SIZE (64 * 1024) + #define MAX_OFFSET_DIFF_S1_S2 48 int vmx_count; @@ -68,25 +72,25 @@ static void test_one(char *s1, char *s2, unsigned long max_offset, static int testcase(bool islarge) { - char *s1; - char *s2; - unsigned long i; - - unsigned long comp_size = (islarge ? LARGE_SIZE : SIZE); - unsigned long alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2; - int iterations = islarge ? LARGE_ITERATIONS : ITERATIONS; - - s1 = memalign(128, alloc_size); - if (!s1) { - perror("memalign"); - exit(1); - } + unsigned long i, comp_size, alloc_size; + char *p, *s1, *s2; + int iterations; - s2 = memalign(128, alloc_size); - if (!s2) { - perror("memalign"); - exit(1); - } + comp_size = (islarge ? LARGE_SIZE : SIZE); + alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2; + iterations = islarge ? LARGE_ITERATIONS : ITERATIONS; + + p = mmap(NULL, 4 * MAP_SIZE, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + FAIL_IF(p == MAP_FAILED); + + /* Put s1/s2 at the end of a page */ + s1 = p + MAP_SIZE - alloc_size; + s2 = p + 3 * MAP_SIZE - alloc_size; + + /* And unmap the subsequent page to force a fault if we overread */ + munmap(p + MAP_SIZE, MAP_SIZE); + munmap(p + 3 * MAP_SIZE, MAP_SIZE); srandom(time(0)); -- 2.25.1