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Running the test as root returns EACCES when trying to map addresses < mmap_min_addr which is not one of the error codes for the retry condition. Add a munmap call after an alignment check as the mappings are retained after the retry and can reach vm.max_map_count. Signed-off-by: Sidhartha Kumar --- tools/testing/selftests/vm/mremap_test.c | 41 +++++++++++++++++++++++- 1 file changed, 40 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/mremap_test.c b/tools/testing/selftests/vm/mremap_test.c index 0624d1bd71b5..58600fee4b81 100644 --- a/tools/testing/selftests/vm/mremap_test.c +++ b/tools/testing/selftests/vm/mremap_test.c @@ -6,6 +6,7 @@ #include #include +#include #include #include #include @@ -64,6 +65,35 @@ enum { .expect_failure = should_fail \ } +/* Returns mmap_min_addr sysctl */ +static unsigned long long get_mmap_min_addr(void) +{ + FILE *fp; + int n_matched; + static unsigned long long addr; + + if (addr) + return addr; + + fp = fopen("/proc/sys/vm/mmap_min_addr", "r"); + if (fp == NULL) { + ksft_print_msg("Failed to open /proc/sys/vm/mmap_min_addr: %s\n", + strerror(errno)); + exit(KSFT_SKIP); + } + + n_matched = fscanf(fp, "%llu", &addr); + if (n_matched != 1) { + ksft_print_msg("Failed to read /proc/sys/vm/mmap_min_addr: %s\n", + strerror(errno)); + fclose(fp); + exit(KSFT_SKIP); + } + + fclose(fp); + return addr; +} + /* * Returns the start address of the mapping on success, else returns * NULL on failure. @@ -72,8 +102,15 @@ static void *get_source_mapping(struct config c) { unsigned long long addr = 0ULL; void *src_addr = NULL; + unsigned long long mmap_min_addr; + + mmap_min_addr = get_mmap_min_addr(); + retry: addr += c.src_alignment; + if (addr < mmap_min_addr) + goto retry; + src_addr = mmap((void *) addr, c.region_size, PROT_READ | PROT_WRITE, MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED, -1, 0); @@ -91,8 +128,10 @@ static void *get_source_mapping(struct config c) * alignment in the tests. */ if (((unsigned long long) src_addr & (c.src_alignment - 1)) || - !((unsigned long long) src_addr & c.src_alignment)) + !((unsigned long long) src_addr & c.src_alignment)) { + munmap(src_addr, c.region_size); goto retry; + } if (!src_addr) goto error; From patchwork Thu Apr 14 17:15:27 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sidhartha Kumar X-Patchwork-Id: 12813775 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 1BB70C433FE for ; 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Thu, 14 Apr 2022 17:15:42 +0000 From: Sidhartha Kumar To: shuah@kernel.org, akpm@linux-foundation.org Cc: Sidhartha Kumar , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/4] selftest/vm: verify remap destination address in mremap_test Date: Thu, 14 Apr 2022 17:15:27 +0000 Message-Id: <20220414171529.62058-3-sidhartha.kumar@oracle.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20220414171529.62058-1-sidhartha.kumar@oracle.com> References: <20220414171529.62058-1-sidhartha.kumar@oracle.com> X-ClientProxiedBy: SN4PR0401CA0007.namprd04.prod.outlook.com (2603:10b6:803:21::17) To CH0PR10MB5113.namprd10.prod.outlook.com (2603:10b6:610:c9::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 0ad12b10-ae26-46a6-0ccd-08da1e3a67d8 X-MS-TrafficTypeDiagnostic: CY4PR1001MB2344:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH0PR10MB5113.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(366004)(52116002)(4326008)(36756003)(186003)(6486002)(86362001)(508600001)(83380400001)(26005)(6666004)(1076003)(2616005)(6512007)(6506007)(66556008)(66476007)(66946007)(8676002)(44832011)(5660300002)(15650500001)(2906002)(8936002)(38350700002)(38100700002)(316002);DIR:OUT;SFP:1101; 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This can cause a segfault if regions such as text are destroyed. Verify the requested mremap destination address does not overlap any existing mappings by using mmap's FIXED_NOREPLACE flag and checking for the EEXIST error code. Keep incrementing the destination address until a valid mapping is found or max address is reached. Signed-off-by: Sidhartha Kumar --- tools/testing/selftests/vm/mremap_test.c | 36 ++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/tools/testing/selftests/vm/mremap_test.c b/tools/testing/selftests/vm/mremap_test.c index 58600fee4b81..98e9cff34aa7 100644 --- a/tools/testing/selftests/vm/mremap_test.c +++ b/tools/testing/selftests/vm/mremap_test.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "../kselftest.h" @@ -65,6 +66,34 @@ enum { .expect_failure = should_fail \ } +/* + * Returns 0 if the requested remap region overlaps with an + * existing mapping (e.g text, stack) else returns 1. + */ +static int remap_region_valid(void *addr, unsigned long long size) +{ + void *remap_addr = NULL; + int ret = 1; + + if ((unsigned long long) addr > ULLONG_MAX - size) { + ksft_print_msg("Can't find a valid region to remap to\n"); + exit(KSFT_SKIP); + } + + /* Use MAP_FIXED_NOREPLACE flag to ensure region is not mapped */ + remap_addr = mmap(addr, size, PROT_READ | PROT_WRITE, + MAP_FIXED_NOREPLACE | MAP_ANONYMOUS | MAP_SHARED, + -1, 0); + if (remap_addr == MAP_FAILED) { + if (errno == EEXIST) + ret = 0; + } else { + munmap(remap_addr, size); + } + + return ret; +} + /* Returns mmap_min_addr sysctl */ static unsigned long long get_mmap_min_addr(void) { @@ -180,6 +209,13 @@ static long long remap_region(struct config c, unsigned int threshold_mb, if (!((unsigned long long) addr & c.dest_alignment)) addr = (void *) ((unsigned long long) addr | c.dest_alignment); + /* Don't destroy existing mappings unless expected to overlap */ + while (!remap_region_valid(addr, c.region_size)) { + if (c.overlapping) + break; + addr += c.src_alignment; + } + clock_gettime(CLOCK_MONOTONIC, &t_start); dest_addr = mremap(src_addr, c.region_size, c.region_size, MREMAP_MAYMOVE|MREMAP_FIXED, (char *) addr); From patchwork Thu Apr 14 17:15:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sidhartha Kumar X-Patchwork-Id: 12813777 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 50B88C433FE for ; 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Signed-off-by: Sidhartha Kumar Reviewed-by: Shuah Khan --- tools/testing/selftests/vm/mremap_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/mremap_test.c b/tools/testing/selftests/vm/mremap_test.c index 98e9cff34aa7..ace9c3596ed7 100644 --- a/tools/testing/selftests/vm/mremap_test.c +++ b/tools/testing/selftests/vm/mremap_test.c @@ -269,7 +269,7 @@ static void run_mremap_test_case(struct test test_case, int *failures, if (remap_time < 0) { if (test_case.expect_failure) - ksft_test_result_pass("%s\n\tExpected mremap failure\n", + ksft_test_result_xfail("%s\n\tExpected mremap failure\n", test_case.name); else { ksft_test_result_fail("%s\n", test_case.name); From patchwork Thu Apr 14 17:15:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sidhartha Kumar X-Patchwork-Id: 12813774 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 F037AC433F5 for ; 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Thu, 14 Apr 2022 17:15:46 +0000 From: Sidhartha Kumar To: shuah@kernel.org, akpm@linux-foundation.org Cc: Sidhartha Kumar , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/4] selftest/vm: add skip support to mremap_test Date: Thu, 14 Apr 2022 17:15:29 +0000 Message-Id: <20220414171529.62058-5-sidhartha.kumar@oracle.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20220414171529.62058-1-sidhartha.kumar@oracle.com> References: <20220414171529.62058-1-sidhartha.kumar@oracle.com> X-ClientProxiedBy: SN4PR0401CA0007.namprd04.prod.outlook.com (2603:10b6:803:21::17) To CH0PR10MB5113.namprd10.prod.outlook.com (2603:10b6:610:c9::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 84fe81bb-f08e-4c46-4e81-08da1e3a6a34 X-MS-TrafficTypeDiagnostic: DM5PR10MB1516:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH0PR10MB5113.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(366004)(66946007)(4326008)(8676002)(5660300002)(44832011)(36756003)(6486002)(52116002)(316002)(66556008)(508600001)(2906002)(6506007)(4744005)(66476007)(6666004)(8936002)(186003)(6512007)(83380400001)(2616005)(26005)(1076003)(38350700002)(38100700002)(86362001);DIR:OUT;SFP:1101; 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Signed-off-by: Sidhartha Kumar Reviewed-by: Shuah Khan --- tools/testing/selftests/vm/run_vmtests.sh | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/vm/run_vmtests.sh b/tools/testing/selftests/vm/run_vmtests.sh index 88e15fbb5027..eae98f5de2cc 100755 --- a/tools/testing/selftests/vm/run_vmtests.sh +++ b/tools/testing/selftests/vm/run_vmtests.sh @@ -272,11 +272,16 @@ echo "-------------------" echo "running mremap_test" echo "-------------------" ./mremap_test -if [ $? -ne 0 ]; then +ret_val=$? + +if [ $ret_val -eq 0 ]; then + echo "[PASS]" +elif [ $ret_val -eq $ksft_skip ]; then + echo "[SKIP]" + exitcode=$ksft_skip +else echo "[FAIL]" exitcode=1 -else - echo "[PASS]" fi echo "-----------------"