From patchwork Mon Jun 3 16:55:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10973345 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 786BE15E6 for ; Mon, 3 Jun 2019 16:56:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6551128684 for ; Mon, 3 Jun 2019 16:56:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 592162874B; Mon, 3 Jun 2019 16:56:40 +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 C502428684 for ; Mon, 3 Jun 2019 16:56:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729736AbfFCQ43 (ORCPT ); Mon, 3 Jun 2019 12:56:29 -0400 Received: from mail-qk1-f202.google.com ([209.85.222.202]:50641 "EHLO mail-qk1-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729732AbfFCQ4R (ORCPT ); Mon, 3 Jun 2019 12:56:17 -0400 Received: by mail-qk1-f202.google.com with SMTP id n77so969566qke.17 for ; Mon, 03 Jun 2019 09:56:16 -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=v9MzlIb7HY1yKtXIqdaDnLUOCgnoLYityVGh+V+FCFI=; b=E8Ist5LC6WVHrU8hj11VtWQb5rjU7iBORWjaptcqcX3l9oPWYIMo05KmXzzCVgt3cu lYJ4Yvl8mbNlJpJWSEYMIryL5scHXmPmVUqUSjI9X7Fuxa39wo8rzDRZFWMAkoj3uwjY mqiCqrBWPtOVkiL+4ZV5H/HhzxJmpTR97uHC/IdXM4tljhuvgYTiLw3741mzKX8NYLUt uc6Aqh8uuXDuaxHP4yeJ0XLPpMovyAE85DGwVCzioR0Gt6moVfBUOYshZAWVCnGUBbU4 06NzOvSR4tkaeqT9+eniQMZF90V1u65K6kkbFscWsH7pqN+ptT1wb5JpdkKVZRneJwoH CGYw== 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=v9MzlIb7HY1yKtXIqdaDnLUOCgnoLYityVGh+V+FCFI=; b=drmaIvYM/jnaoyV5sWZcQHiOMkUuvLLVPBCGYU4lCI461mcqY1A5oty3asl08hm70X c/mQS75+RkR2aQLbmVpYMU6r4nRLPiooQ3OZ79kqkpsy9sS4XAPOykENYlgy7VoZdg4p 7uzrR5BgnRVe5GWgH+baxvS+6ew+epM/S9owRpSfPco7lH6siKPoAvwixf753aMbdCGf LTEteKLlUBU9uaog1gVjzXQiqVb+dtbuLIBcPO7bjabzoQIsXv9Qlc8ivVngnyoy9QIX 2WQeCHcmkD/uhHYBH6CkNXSEfSdsrm0+TuPz/KkskCY8M6zGOLyQUpzD9ovPeMvV/EEZ GFSQ== X-Gm-Message-State: APjAAAWpPYIluMcOHnZRGcFRht4uL32DkMYr2CanvDrV48JUptlUlkjQ hVJUtOo1WqhJqwJUYoBgGEABL3vX8+UPWJjs X-Google-Smtp-Source: APXvYqyupRnjjQO94efnTljbt6p9DxywyyDuZaQUfwBf3Y405Fl40dWCznelJThhDpEIkj52c6mVbKSb6DjD/rvF X-Received: by 2002:a37:de06:: with SMTP id h6mr3881914qkj.322.1559580976267; Mon, 03 Jun 2019 09:56:16 -0700 (PDT) Date: Mon, 3 Jun 2019 18:55:18 +0200 In-Reply-To: Message-Id: <9e1b5998a28f82b16076fc85ab4f88af5381cf74.1559580831.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.rc1.311.g5d7573a151-goog Subject: [PATCH v16 16/16] 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. Signed-off-by: Andrey Konovalov Reviewed-by: Kees Cook Acked-by: Shuah Khan --- tools/testing/selftests/arm64/.gitignore | 1 + tools/testing/selftests/arm64/Makefile | 22 ++++++++++ .../testing/selftests/arm64/run_tags_test.sh | 12 ++++++ tools/testing/selftests/arm64/tags_lib.c | 42 +++++++++++++++++++ tools/testing/selftests/arm64/tags_test.c | 18 ++++++++ 5 files changed, 95 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..e8fae8d61ed6 --- /dev/null +++ b/tools/testing/selftests/arm64/.gitignore @@ -0,0 +1 @@ +tags_test 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..8a674509216e --- /dev/null +++ b/tools/testing/selftests/arm64/tags_lib.c @@ -0,0 +1,42 @@ +#include + +#define TAG_SHIFT (56) +#define TAG_MASK (0xffUL << TAG_SHIFT) + +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) +{ + unsigned long tag = rand() & 0xff; + if (!ptr) + return ptr; + 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; +}