From patchwork Fri Apr 5 08:44:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dev Jain X-Patchwork-Id: 13618806 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C5358CD11C2 for ; Fri, 5 Apr 2024 10:05:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=SZ5jjcNIpJcgUCfuNrFpEgWurKcT23CzuYQSk898tlE=; b=i7JyYznbUFDYGd y33aerLUEdX3jwJ8IPhlD2irq34U6RkggVIvgBjgfWH7iTLg9BLnGEA+4hLG/Jy8NPRpSYxb65soN 4iUZ8BlFeqNgbRh9GCZV3CnVyXl10CVW1TyvpBC7tJHZ8gN/Sg089K791W+1yqTLMnHYwNssNq7oz vqre1s1SrO5c27/K6Lb3mgBVU1AsN8hdh8C+wCCUJhZvQKxKRU6AczdmHiQIJFd5YvbPPStI3+28y pxjhveRCO+oXwATJZQQxU+f9SEJwsR6kQlJmX+/5yS0ZWBzjFu8e21RJ5qy5G50d5vGs7r+/hNH8M +hOu0KPKY3nGuAN7VLEw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rsgRI-00000006KlW-2Ccz; Fri, 05 Apr 2024 10:04:52 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rsfGk-000000061G9-3S9D for linux-arm-kernel@lists.infradead.org; Fri, 05 Apr 2024 08:49:56 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 73E7A1007; Fri, 5 Apr 2024 01:50:21 -0700 (PDT) Received: from e116581.blr.arm.com (e116581.arm.com [10.162.43.7]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 6B2C73F64C; Fri, 5 Apr 2024 01:49:46 -0700 (PDT) From: Dev Jain To: shuah@kernel.org, linux-arm-kernel@lists.infradead.org Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Anshuman.Khandual@arm.com, suzuki.poulose@arm.com, ryan.roberts@arm.com, rob.herring@arm.com, Catalin.Marinas@arm.com, broonie@kernel.org, will@kernel.org, mark.rutland@arm.com, Dev Jain Subject: [PATCH 1/4] selftests/arm: Add mm test Date: Fri, 5 Apr 2024 14:14:07 +0530 Message-Id: <20240405084410.256788-2-dev.jain@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240405084410.256788-1-dev.jain@arm.com> References: <20240405084410.256788-1-dev.jain@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240405_014954_987716_B592C658 X-CRM114-Status: GOOD ( 15.51 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This patch tests the 4GB VA restriction for 32-bit processes; it is required to test the compat layer, whether the kernel knows that it is running a 32-bit process or not. Chunks are allocated until the VA gets exhausted; mmap must fail beyond 4GB. This is asserted against the VA mappings found in /proc/self/maps. Signed-off-by: Dev Jain --- tools/testing/selftests/arm/mm/compat_va.c | 94 ++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 tools/testing/selftests/arm/mm/compat_va.c diff --git a/tools/testing/selftests/arm/mm/compat_va.c b/tools/testing/selftests/arm/mm/compat_va.c new file mode 100644 index 000000000000..3a78f240bc87 --- /dev/null +++ b/tools/testing/selftests/arm/mm/compat_va.c @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2024 ARM Limited + * + * Author : Dev Jain + * + * Tests 4GB VA restriction for 32 bit process + */ + +#define _GNU_SOURCE +#include +#include +#include +#include + +#include +#include + +#define MAP_CHUNK_SIZE SZ_1M +#define NR_CHUNKS_4G (SZ_1G / MAP_CHUNK_SIZE) * 4 /* prevent overflow */ + +static int validate_address_hint(void) +{ + char *ptr; + + ptr = mmap((void *) (1UL << 29), MAP_CHUNK_SIZE, PROT_READ | + PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + + if (ptr == MAP_FAILED) + return 0; + + return 1; +} + +int main(int argc, char *argv[]) +{ + char *ptr[NR_CHUNKS_4G + 3]; + char line[1000]; + const char *file_name; + int chunks; + FILE *file; + int i; + + ksft_print_header(); + ksft_set_plan(1); + + /* try allocation beyond 4 GB */ + for (i = 0; i < NR_CHUNKS_4G + 3; ++i) { + ptr[i] = mmap(NULL, MAP_CHUNK_SIZE, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + + if (ptr[i] == MAP_FAILED) { + if (validate_address_hint()) + ksft_exit_fail_msg("VA exhaustion failed\n"); + break; + } + } + + chunks = i; + if (chunks >= NR_CHUNKS_4G) { + ksft_test_result_fail("mmapped chunks beyond 4GB\n"); + ksft_finished(); + } + + /* parse /proc/self/maps, confirm 32 bit VA mappings */ + file_name = "/proc/self/maps"; + file = fopen(file_name, "r"); + if (file == NULL) + ksft_exit_fail_msg("/proc/self/maps cannot be opened\n"); + + while (fgets(line, sizeof(line), file)) { + const char *whitespace_loc, *hyphen_loc; + + hyphen_loc = strchr(line, '-'); + whitespace_loc = strchr(line, ' '); + + if (!(hyphen_loc && whitespace_loc)) { + ksft_test_result_skip("Unexpected format"); + ksft_finished(); + } + + if ((hyphen_loc - line > 8) || + (whitespace_loc - hyphen_loc) > 9) { + ksft_test_result_fail("Memory map more than 32 bits\n"); + ksft_finished(); + } + } + + for (int i = 0; i < chunks; ++i) + munmap(ptr[i], MAP_CHUNK_SIZE); + + ksft_test_result_pass("Test\n"); + ksft_finished(); +}