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[2620:137:e000::1:20]) by mx.google.com with ESMTP id hc42-20020a17090716aa00b0077ab738911fsi1991342ejc.140.2022.09.30.08.17.43; Fri, 30 Sep 2022 08:18:08 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=LHI40d6A; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232088AbiI3OtQ (ORCPT + 99 others); Fri, 30 Sep 2022 10:49:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231688AbiI3OsY (ORCPT ); Fri, 30 Sep 2022 10:48:24 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 27AF512C6A0 for ; Fri, 30 Sep 2022 07:48:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1664549302; x=1696085302; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=lfgs1sbjqVgjmRBpsYkrun90xhGNzb3paiVIQEiS4+s=; b=LHI40d6AENKSoF/Rh8IS33JchV9SpbbkV94sN046Fgp7xjSj8xIzKMDD 8bBbtHN8VXqiusiPjsSchCGmcRP0b0NpidzkOgtDu5NLqaCnjgk2rBEiw B6wKf2QATPmAl/v9KwJx4AjnbEKABZz75nyakAwmabwc5piiX2+asEJkY op0FJm7YOGHhmiwf3wgShbDS2z5MJ6VP3ud98X0BZYNlspbwy6PScv6hO 82paClthzCQ03iNj22HyZMCJ1eA8O1z/+7Q+G8YxTSJ+CP3yFjft5ItA7 Lc+eoFDgqEj9mOljyYfKZhDv+5AF0IeA1udDL9arCpi3JdDk0WtiPPDqm Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10486"; a="328590078" X-IronPort-AV: E=Sophos;i="5.93,358,1654585200"; d="scan'208";a="328590078" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Sep 2022 07:48:15 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10486"; a="691271806" X-IronPort-AV: E=Sophos;i="5.93,358,1654585200"; d="scan'208";a="691271806" Received: from herrerop-mobl1.ger.corp.intel.com (HELO box.shutemov.name) ([10.252.38.128]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Sep 2022 07:48:11 -0700 Received: by box.shutemov.name (Postfix, from userid 1000) id 9E7B5104D66; Fri, 30 Sep 2022 17:48:02 +0300 (+03) From: "Kirill A. Shutemov" To: Dave Hansen , Andy Lutomirski , Peter Zijlstra Cc: x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , Bharata B Rao , Jacob Pan , Ashok Raj , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Weihong Zhang , "Kirill A . Shutemov" Subject: [PATCHv9 12/14] selftests/x86/lam: Add mmap and SYSCALL test cases for linear-address masking Date: Fri, 30 Sep 2022 17:47:56 +0300 Message-Id: <20220930144758.30232-13-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220930144758.30232-1-kirill.shutemov@linux.intel.com> References: <20220930144758.30232-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Weihong Zhang Add mmap and SYSCALL test cases. SYSCALL test cases: - LAM supports set metadata in high bits 62:57 (LAM_U57) of a user pointer, pass the pointer to SYSCALL, SYSCALL can dereference the pointer and return correct result. - Disable LAM, pass a pointer with metadata in high bits to SYSCALL, SYSCALL returns -1 (EFAULT). MMAP test cases: - Enable LAM_U57, MMAP with low address (below bits 47), set metadata in high bits of the address, dereference the address should be allowed. - Enable LAM_U57, MMAP with high address (above bits 47), set metadata in high bits of the address, dereference the address should be allowed. Signed-off-by: Weihong Zhang Signed-off-by: Kirill A. Shutemov --- tools/testing/selftests/x86/lam.c | 144 +++++++++++++++++++++++++++++- 1 file changed, 140 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/x86/lam.c b/tools/testing/selftests/x86/lam.c index 900a3a0fb709..cdc6e40e00e0 100644 --- a/tools/testing/selftests/x86/lam.c +++ b/tools/testing/selftests/x86/lam.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include @@ -29,11 +30,18 @@ /* Specified test function bits */ #define FUNC_MALLOC 0x1 #define FUNC_BITS 0x2 +#define FUNC_MMAP 0x4 +#define FUNC_SYSCALL 0x8 -#define TEST_MASK 0x3 +#define TEST_MASK 0xf + +#define LOW_ADDR (0x1UL << 30) +#define HIGH_ADDR (0x3UL << 48) #define MALLOC_LEN 32 +#define PAGE_SIZE (4 << 10) + struct testcases { unsigned int later; int expected; /* 2: SIGSEGV Error; 1: other errors */ @@ -49,6 +57,7 @@ jmp_buf segv_env; static void segv_handler(int sig) { ksft_print_msg("Get segmentation fault(%d).", sig); + siglongjmp(segv_env, 1); } @@ -61,6 +70,16 @@ static inline int cpu_has_lam(void) return (cpuinfo[0] & (1 << 26)); } +/* Check 5-level page table feature in CPUID.(EAX=07H, ECX=00H):ECX.[bit 16] */ +static inline int cpu_has_la57(void) +{ + unsigned int cpuinfo[4]; + + __cpuid_count(0x7, 0, cpuinfo[0], cpuinfo[1], cpuinfo[2], cpuinfo[3]); + + return (cpuinfo[2] & (1 << 16)); +} + /* * Set tagged address and read back untag mask. * check if the untagged mask is expected. @@ -213,6 +232,68 @@ static int handle_malloc(struct testcases *test) return ret; } +static int handle_mmap(struct testcases *test) +{ + void *ptr; + unsigned int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED; + int ret = 0; + + if (test->later == 0 && test->lam != 0) + if (set_lam(test->lam) != 0) + return 1; + + ptr = mmap((void *)test->addr, PAGE_SIZE, PROT_READ | PROT_WRITE, + flags, -1, 0); + if (ptr == MAP_FAILED) { + if (test->addr == HIGH_ADDR) + if (!cpu_has_la57()) + return 3; /* unsupport LA57 */ + return 1; + } + + if (test->later != 0 && test->lam != 0) + if (set_lam(test->lam) != 0) + ret = 1; + + if (ret == 0) { + if (sigsetjmp(segv_env, 1) == 0) { + signal(SIGSEGV, segv_handler); + ret = handle_lam_test(ptr, test->lam); + } else { + ret = 2; + } + } + + munmap(ptr, PAGE_SIZE); + return ret; +} + +static int handle_syscall(struct testcases *test) +{ + struct utsname unme, *pu; + int ret = 0; + + if (test->later == 0 && test->lam != 0) + if (set_lam(test->lam) != 0) + return 1; + + if (sigsetjmp(segv_env, 1) == 0) { + signal(SIGSEGV, segv_handler); + pu = (struct utsname *)set_metadata((uint64_t)&unme, test->lam); + ret = uname(pu); + if (ret < 0) + ret = 1; + } else { + ret = 2; + } + + if (test->later != 0 && test->lam != 0) + if (set_lam(test->lam) != -1 && ret == 0) + ret = 1; + + return ret; +} + static int fork_test(struct testcases *test) { int ret, child_ret; @@ -241,13 +322,20 @@ static void run_test(struct testcases *test, int count) struct testcases *t = test + i; /* fork a process to run test case */ + tests_cnt++; ret = fork_test(t); + + /* return 3 is not support LA57, the case should be skipped */ + if (ret == 3) { + ksft_test_result_skip(t->msg); + continue; + } + if (ret != 0) ret = (t->expected == ret); else ret = !(t->expected); - tests_cnt++; ksft_test_result(ret, t->msg); } } @@ -268,7 +356,6 @@ static struct testcases malloc_cases[] = { }, }; - static struct testcases bits_cases[] = { { .test_func = handle_max_bits, @@ -276,11 +363,54 @@ static struct testcases bits_cases[] = { }, }; +static struct testcases syscall_cases[] = { + { + .later = 0, + .lam = LAM_U57_BITS, + .test_func = handle_syscall, + .msg = "SYSCALL: LAM_U57. syscall with metadata\n", + }, + { + .later = 1, + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = handle_syscall, + .msg = "SYSCALL:[Negative] Disable LAM. Dereferencing pointer with metadata.\n", + }, +}; + +static struct testcases mmap_cases[] = { + { + .later = 1, + .expected = 0, + .lam = LAM_U57_BITS, + .addr = HIGH_ADDR, + .test_func = handle_mmap, + .msg = "MMAP: First mmap high address, then set LAM_U57.\n", + }, + { + .later = 0, + .expected = 0, + .lam = LAM_U57_BITS, + .addr = HIGH_ADDR, + .test_func = handle_mmap, + .msg = "MMAP: First LAM_U57, then High address.\n", + }, + { + .later = 0, + .expected = 0, + .lam = LAM_U57_BITS, + .addr = LOW_ADDR, + .test_func = handle_mmap, + .msg = "MMAP: First LAM_U57, then Low address.\n", + }, +}; + static void cmd_help(void) { printf("usage: lam [-h] [-t test list]\n"); printf("\t-t test list: run tests specified in the test list, default:0x%x\n", TEST_MASK); - printf("\t\t0x1:malloc; 0x2:max_bits;\n"); + printf("\t\t0x1:malloc; 0x2:max_bits; 0x4:mmap; 0x8:syscall.\n"); printf("\t-h: help\n"); } @@ -320,6 +450,12 @@ int main(int argc, char **argv) if (tests & FUNC_BITS) run_test(bits_cases, ARRAY_SIZE(bits_cases)); + if (tests & FUNC_MMAP) + run_test(mmap_cases, ARRAY_SIZE(mmap_cases)); + + if (tests & FUNC_SYSCALL) + run_test(syscall_cases, ARRAY_SIZE(syscall_cases)); + ksft_set_plan(tests_cnt); return ksft_exit_pass(); -- 2.35.1