From patchwork Fri Jul 7 15:08:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Zhangjin Wu X-Patchwork-Id: 700272 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 17E51EB64D9 for ; Fri, 7 Jul 2023 15:09:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233054AbjGGPJE (ORCPT ); Fri, 7 Jul 2023 11:09:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233327AbjGGPIz (ORCPT ); Fri, 7 Jul 2023 11:08:55 -0400 Received: from bg4.exmail.qq.com (bg4.exmail.qq.com [43.155.65.254]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C157926B5; Fri, 7 Jul 2023 08:08:49 -0700 (PDT) X-QQ-mid: bizesmtp91t1688742515ti7jswgp Received: from linux-lab-host.localdomain ( [116.30.131.119]) by bizesmtp.qq.com (ESMTP) with id ; Fri, 07 Jul 2023 23:08:34 +0800 (CST) X-QQ-SSF: 01200000000000D0W000000A0000000 X-QQ-FEAT: D6RqbDSxuq6OBW3CsVdKIjFvpbHMW/wgNqC9K9ilhUQlZg0IgX7nDFBEM0M1Q Xro0AOa3zXB43uoPd20W0Y477EJFex9MLuooi5XD4l6HZh5jKuXPydugZugaq81/kFkWdzi 3NKHk+AalEIw0dPBy4h4W6KiwiEYiJPPyFG6rYQmY/1kCx+saPO3DCVGv3MJVWfYJsPD6KV IuJTjUO3zKXqGBxMOdDSSIuwIhoddepxd1W7qukyLJhlVo6ysR4binyQztDX5Ilg0LLohMa XYhps7gmzdcUzBnqBo8YRSzHFNKM1F6c/RShkpHyQHJCnFVnbO0EY/nmeOLelwc4WTsFgqO KwzB6ccg8NLuclWZ81+ujKcAIST6H1z9RVvh+O8xaKEeySAb/fX7v939M8dFY1sJi6Xp/fp /tU5uvp4U9o= X-QQ-GoodBg: 0 X-BIZMAIL-ID: 12299959330165944862 From: Zhangjin Wu To: w@1wt.eu Cc: falcon@tinylab.org, arnd@arndb.de, david.laight@aculab.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, thomas@t-8ch.de, =?utf-8?q?Thomas_Wei?= =?utf-8?q?=C3=9Fschuh?= Subject: [PATCH v6 15/15] selftests/nolibc: add mmap_munmap_good test case Date: Fri, 7 Jul 2023 23:08:20 +0800 Message-Id: <838f401801aea4476f54d7f5117dc90d8839a515.1688739493.git.falcon@tinylab.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtp:tinylab.org:qybglogicsvrgz:qybglogicsvrgz5a-1 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org mmap() a file with a good offset and then munmap() it. a non-zero offset is passed to test the 6th argument of my_syscall6(). Note, it is not easy to find a unique file for mmap() in different scenes, so, a file list is used to search the right one: - /dev/zero: is commonly used to allocate anonymous memory and is likely present and readable - /proc/1/exe: for 'run' and 'run-user' target, 'run-user' can not find '/proc/self/exe' - /proc/self/exe: for 'libc-test' target, normal program 'libc-test' has no permission to access '/proc/1/exe' - argv0: the path of the program itself, let it pass even with worst case scene: no procfs and no /dev/zero Suggested-by: Willy Tarreau Link: https://lore.kernel.org/lkml/20230702193306.GK16233@1wt.eu/ Suggested-by: Thomas Weißschuh Link: https://lore.kernel.org/lkml/bff82ea6-610b-4471-a28b-6c76c28604a6@t-8ch.de/ Signed-off-by: Zhangjin Wu --- tools/testing/selftests/nolibc/nolibc-test.c | 60 ++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 8644e415cb66..a7191b637b85 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -595,6 +595,65 @@ static int test_stat_timestamps(void) return 0; } +int test_mmap_munmap(void) +{ + int ret, fd, i; + void *mem; + size_t page_size, file_size, length; + off_t offset, pa_offset; + struct stat stat_buf; + const char * const files[] = { + "/dev/zero", + "/proc/1/exe", "/proc/self/exe", + argv0, + NULL + }; + + page_size = getpagesize(); + if (page_size < 0) + return -1; + + /* find a right file to mmap, existed and accessible */ + for (i = 0; files[i] != NULL; i++) { + ret = fd = open(files[i], O_RDONLY); + if (ret == -1) + continue; + else + break; + } + if (ret == -1) + return ret; + + ret = stat(files[i], &stat_buf); + if (ret == -1) + goto end; + + /* file size of the special /dev/zero is 0, let's assign one manually */ + if (i == 0) + file_size = 3*page_size; + else + file_size = stat_buf.st_size; + + offset = file_size - 1; + if (offset < 0) + offset = 0; + length = file_size - offset; + pa_offset = offset & ~(page_size - 1); + + mem = mmap(NULL, length + offset - pa_offset, PROT_READ, MAP_SHARED, fd, pa_offset); + if (mem == MAP_FAILED) { + ret = -1; + goto end; + } + + ret = munmap(mem, length + offset - pa_offset); + +end: + close(fd); + return ret; +} + + /* Run syscall tests between IDs and . * Return 0 on success, non-zero on failure. */ @@ -671,6 +730,7 @@ int run_syscall(int min, int max) CASE_TEST(mkdir_root); EXPECT_SYSER(1, mkdir("/", 0755), -1, EEXIST); break; CASE_TEST(mmap_bad); EXPECT_PTRER(1, mmap(NULL, 0, PROT_READ, MAP_PRIVATE, 0, 0), MAP_FAILED, EINVAL); break; CASE_TEST(munmap_bad); EXPECT_SYSER(1, munmap((void *)1, 0), -1, EINVAL); break; + CASE_TEST(mmap_munmap_good); EXPECT_SYSZR(1, test_mmap_munmap()); break; CASE_TEST(open_tty); EXPECT_SYSNE(1, tmp = open("/dev/null", 0), -1); if (tmp != -1) close(tmp); break; CASE_TEST(open_blah); EXPECT_SYSER(1, tmp = open("/proc/self/blah", 0), -1, ENOENT); if (tmp != -1) close(tmp); break; CASE_TEST(poll_null); EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;