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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=AreQT5W2; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=kxWQZVwH; dmarc=pass (policy=none) header.from=oracle.com; spf=none (imf03.hostedemail.com: domain of sidhartha.kumar@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=sidhartha.kumar@oracle.com X-Rspam-User: X-HE-Tag: 1649956553-484720 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Avoid calling mmap with requested addresses that are less than the system's mmap_min_addr. 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: 12813781 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0802C433F5 for ; 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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=bf1nBTiZ; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b="CApg6/iy"; spf=none (imf09.hostedemail.com: domain of sidhartha.kumar@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=sidhartha.kumar@oracle.com; dmarc=pass (policy=none) header.from=oracle.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 574B914000C X-HE-Tag: 1649956555-956364 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Because mremap does not have a NOREPLACE flag, it can destroy existing mappings. 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: 12813782 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E0EBC433EF 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: 12813780 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93197C433EF for ; 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dkim=pass header.d=oracle.com header.s=corp-2021-07-09 header.b=HrlyaOSd; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=BLFPh+8J; spf=none (imf16.hostedemail.com: domain of sidhartha.kumar@oracle.com has no SPF policy when checking 205.220.177.32) smtp.mailfrom=sidhartha.kumar@oracle.com; dmarc=pass (policy=none) header.from=oracle.com X-Stat-Signature: j81ee4dzyztxrcp4rfpnn84n3s3nwunt X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 265CB180003 X-HE-Tag: 1649956552-21824 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Allow the mremap test to be skipped due to errors such as failing to find a valid remap region and failure to parse the mmap_min_addr sysctl. 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 "-----------------"