From patchwork Wed Jun 12 11:43:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10989601 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AB44076 for ; Wed, 12 Jun 2019 11:44:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 97A2D286C6 for ; Wed, 12 Jun 2019 11:44:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 88ACE28A24; Wed, 12 Jun 2019 11:44:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EA3C8286C6 for ; Wed, 12 Jun 2019 11:44:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726004AbfFLLoi (ORCPT ); Wed, 12 Jun 2019 07:44:38 -0400 Received: from mail-yw1-f73.google.com ([209.85.161.73]:42671 "EHLO mail-yw1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438553AbfFLLoY (ORCPT ); Wed, 12 Jun 2019 07:44:24 -0400 Received: by mail-yw1-f73.google.com with SMTP id k142so16981433ywa.9 for ; Wed, 12 Jun 2019 04:44:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=gGgZ3a6eTnEUj++uQZqNg8ohQ9SAhJYSqDRRhc7mNEI=; b=IyYT4UbafS5twM0xOLKRaXywnDFDdbDqJgnUILJhttHP1uH2L+NNxbnxVgYAee8lTj qqRpjg9Px1/VzqAAM6upfA449si21/4lJ1XkboyBr77Ub0YTrQLbJn5sOIwz1IVA69V5 Ap8ARpNEkRP6VF2Emm63QaD9Cx3fvDSKZaN/HHC/Xocn6hv1419HlST6JCQQ1Z5EHlL/ CiJ+tHOg0rDi38FsnXC87324szrGfxAi8RWcHgDsH+2gfi2ulhbLZaNJ0gAKDJ3X8Gkg JxyfovuFPvVfND0iTfX5ByU+bmOloPTC5uiR6JL5swcvm2UzXNQY3tCHhrlAltKj98wk GeRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=gGgZ3a6eTnEUj++uQZqNg8ohQ9SAhJYSqDRRhc7mNEI=; b=O4aaDXTgj3ZPT55AbkwNUe+1Bf3sKt8jeRP5hJupNULeGsZJt4vHzffJzBNXGvWCqi 4FoEYuKb5WhrwHeebH8C3UkcPZVNu6gxh3XqzUp3X8Jkr6H24UkF+GcbqUoF54swhYN7 HY6230aBnW7I/GclnWZ+CV1dQrSxF3ZtW8qfYfLQGZXOhD6MkDt+lOUP4TMFQNcnfdMW avpNTDAlnoztbyCimYCIyvQWkEPvu6N1DqXwe2h0kLGQdlvVb94DlobU/VliUY89BA2p UszrNf5nOxgKSIQjQ2hU5Ni+CF9hwMbdqnWzu70PLlbepUuZ+imJfl6tpEQhDi+mIni8 ED0A== X-Gm-Message-State: APjAAAWdbtEYCR63W4NkBihEEfVcBXXDL2ASCG3LghwVWsw55lqxOMlO yQAxJyDpAeitu4X/QYhF8oztKeTQhQDjspEx X-Google-Smtp-Source: APXvYqw2mEWzgJjQoV5VS4+2oS4fV2R/NqpuRE12+fqx+o9WDuiIlBB+xhQmG1zgiCj0aRJhgLJNrenJlX6SsR3w X-Received: by 2002:a81:6d46:: with SMTP id i67mr906534ywc.103.1560339863971; Wed, 12 Jun 2019 04:44:23 -0700 (PDT) Date: Wed, 12 Jun 2019 13:43:32 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.rc2.383.gf4fbbf30c2-goog Subject: [PATCH v17 15/15] selftests, arm64: add a selftest for passing tagged pointers to kernel From: Andrey Konovalov To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. This patch adds a simple test, that calls the uname syscall with a tagged user pointer as an argument. Without the kernel accepting tagged user pointers the test fails with EFAULT. Co-developed-by: Catalin Marinas Signed-off-by: Andrey Konovalov --- tools/testing/selftests/arm64/.gitignore | 2 + tools/testing/selftests/arm64/Makefile | 22 +++++++ .../testing/selftests/arm64/run_tags_test.sh | 12 ++++ tools/testing/selftests/arm64/tags_lib.c | 62 +++++++++++++++++++ tools/testing/selftests/arm64/tags_test.c | 18 ++++++ 5 files changed, 116 insertions(+) create mode 100644 tools/testing/selftests/arm64/.gitignore create mode 100644 tools/testing/selftests/arm64/Makefile create mode 100755 tools/testing/selftests/arm64/run_tags_test.sh create mode 100644 tools/testing/selftests/arm64/tags_lib.c create mode 100644 tools/testing/selftests/arm64/tags_test.c diff --git a/tools/testing/selftests/arm64/.gitignore b/tools/testing/selftests/arm64/.gitignore new file mode 100644 index 000000000000..9b6a568de17f --- /dev/null +++ b/tools/testing/selftests/arm64/.gitignore @@ -0,0 +1,2 @@ +tags_test +tags_lib.so diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile new file mode 100644 index 000000000000..9dee18727923 --- /dev/null +++ b/tools/testing/selftests/arm64/Makefile @@ -0,0 +1,22 @@ +# SPDX-License-Identifier: GPL-2.0 + +include ../lib.mk + +# ARCH can be overridden by the user for cross compiling +ARCH ?= $(shell uname -m 2>/dev/null || echo not) + +ifneq (,$(filter $(ARCH),aarch64 arm64)) + +TEST_CUSTOM_PROGS := $(OUTPUT)/tags_test + +$(OUTPUT)/tags_test: tags_test.c $(OUTPUT)/tags_lib.so + $(CC) -o $@ $(CFLAGS) $(LDFLAGS) $< + +$(OUTPUT)/tags_lib.so: tags_lib.c + $(CC) -o $@ -shared $(CFLAGS) $(LDFLAGS) $^ + +TEST_PROGS := run_tags_test.sh + +all: $(TEST_CUSTOM_PROGS) + +endif diff --git a/tools/testing/selftests/arm64/run_tags_test.sh b/tools/testing/selftests/arm64/run_tags_test.sh new file mode 100755 index 000000000000..2bbe0cd4220b --- /dev/null +++ b/tools/testing/selftests/arm64/run_tags_test.sh @@ -0,0 +1,12 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +echo "--------------------" +echo "running tags test" +echo "--------------------" +LD_PRELOAD=./tags_lib.so ./tags_test +if [ $? -ne 0 ]; then + echo "[FAIL]" +else + echo "[PASS]" +fi diff --git a/tools/testing/selftests/arm64/tags_lib.c b/tools/testing/selftests/arm64/tags_lib.c new file mode 100644 index 000000000000..55f64fc1aae6 --- /dev/null +++ b/tools/testing/selftests/arm64/tags_lib.c @@ -0,0 +1,62 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include + +#define TAG_SHIFT (56) +#define TAG_MASK (0xffUL << TAG_SHIFT) + +#define PR_SET_TAGGED_ADDR_CTRL 55 +#define PR_GET_TAGGED_ADDR_CTRL 56 +#define PR_TAGGED_ADDR_ENABLE (1UL << 0) + +void *__libc_malloc(size_t size); +void __libc_free(void *ptr); +void *__libc_realloc(void *ptr, size_t size); +void *__libc_calloc(size_t nmemb, size_t size); + +static void *tag_ptr(void *ptr) +{ + static int tagged_addr_err = 1; + unsigned long tag = 0; + + /* + * Note that this code is racy. We only use it as a part of a single + * threaded test application. Beware of using in multithreaded ones. + */ + if (tagged_addr_err == 1) + tagged_addr_err = prctl(PR_SET_TAGGED_ADDR_CTRL, + PR_TAGGED_ADDR_ENABLE, 0, 0, 0); + + if (!ptr) + return ptr; + if (!tagged_addr_err) + tag = rand() & 0xff; + + return (void *)((unsigned long)ptr | (tag << TAG_SHIFT)); +} + +static void *untag_ptr(void *ptr) +{ + return (void *)((unsigned long)ptr & ~TAG_MASK); +} + +void *malloc(size_t size) +{ + return tag_ptr(__libc_malloc(size)); +} + +void free(void *ptr) +{ + __libc_free(untag_ptr(ptr)); +} + +void *realloc(void *ptr, size_t size) +{ + return tag_ptr(__libc_realloc(untag_ptr(ptr), size)); +} + +void *calloc(size_t nmemb, size_t size) +{ + return tag_ptr(__libc_calloc(nmemb, size)); +} diff --git a/tools/testing/selftests/arm64/tags_test.c b/tools/testing/selftests/arm64/tags_test.c new file mode 100644 index 000000000000..263b302874ed --- /dev/null +++ b/tools/testing/selftests/arm64/tags_test.c @@ -0,0 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include + +int main(void) +{ + struct utsname *ptr; + int err; + + ptr = (struct utsname *)malloc(sizeof(*ptr)); + err = uname(ptr); + free(ptr); + return err; +}