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Howlett" Subject: [PATCH v9 2/7] selftests: x86: test_mremap_vdso: skip if vdso is msealed Date: Wed, 5 Mar 2025 02:17:06 +0000 Message-ID: <20250305021711.3867874-3-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog In-Reply-To: <20250305021711.3867874-1-jeffxu@google.com> References: <20250305021711.3867874-1-jeffxu@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: 3tpczcga3kf48drci3ghkbdetdw7i8r1 X-Rspamd-Queue-Id: 880DB40005 X-Rspamd-Server: rspam07 X-HE-Tag: 1741141044-508463 X-HE-Meta: U2FsdGVkX1+tIIf7GqZNzfFR0TBErcxRN7lXABf/NHUQ76QNPC2Suu9lsQYdEPV6EbNzwJdlo+Ic+W/PMWIeoBhXypnMIaL7DreZpdOrVSYl39Y3KZP7zam1xxijbmBCabxWDxW0WgOhS86Ya3RohJvi9OohO0fsbuTSHWiWmFDuZw3ILRrNS2pCKA0y9EFo4z61Yytvja40hRoQpf/uQXSVUP4yElfhIdX61SKFftPXTrZtsFDAp3VmviYbpkHMGbi3ADBTvOSyDoKQbZi2COm5d/oZY9JeOZDPs1jIeGXeqHVI8C05NsRYYeA1PpmlKpcc/HzGd9/H9RJ1EiZiEqLF3kO08iXopRCuXlGqCZrdX4i4s2kGxu9Dti0gK718Nf4wEs4bBxqOa7Ry+vilzUDRr5dVk5VmtzlJTGFWZi6a/F0ywyxdERRG6OxS8t/WDCxTYidpnyRmjhDUXX+WKCLvNAuD08vzjPVx12G1fky6PsCXSFOJnMUrTCBEChMSv6xbcemiCUnxGmuASJ1LCB8Z2DbWnOfa1Yo0LfXN/kaKMihnezTL8d+mwnWxzCzaxy/HXCu3+IzJPGe8AhvW0aU4+4Pc+uIMWZ4QPAx1i5AcQEwnI+8ZgFSRYi8SQVKpOhNyKA7lPO/kzAqTPgScnHXMauaNv2O+y4OEjNZ7xgsWF1w3+lAhSINtf5/TIMRo2U6Pw/FH2LvDlY894Ln9VkHsOP9PIL6afa3jdQYcj/Igk9vODLivR0wnVl4WopGx3SlPQLyq2v8dkJz41hiXMM/U3vM+ljNv2Kwa1L76HtEbAvSMYK5glcR0GzJNRxcWpyTtDnS5tE5b4LCU8dwNXpXfMyKbo6RIgDgsl+OoIu1u6+ykJMVm4GeXf38lIB06Pp0G2CjaCMDjDmHS/Uk8XJL0qOCHGd3hGjpoCNxpMqC2GuYo3wsA5LlIpuSt4O2xZ1Qo6WseHrXgfn2OWIb tVS2HEUD Wf18ojkRrQ9g79guS9fxvbFcjnAbmOE1Ijb02pmRnTRe6iW9WGufaJLLY6Krr9WYHRAQItWSo0vquIsFK0Dz//hzhZOpAHyt/r82cai9r6W9BvxhkCet8kAaE3AXOXnjB5f+WzLwLmnw5EkqgcL93wa/N66NyDuU4bndZc1dZAvtiwKaMCr4GAWM8XYosdVGGSot9RwHo1TLah5vNdTByHRvj50IFlZs4txZoP+lK504Za6fACRz0WX7xoDOD5RaiDALpzrONP54e6amz23zmNTzPRpZvzcuJ4W7waT7GLMlTlZoiRcHzDFd7oQ0jFBPk6kYn9fQWdZ1dOvEvJ/kK4uXrgYTsv+Mg62VSLKh+Yysf48bGLEqiUwoCtLjey2B7ewUJ133C1UD/k5zocq4eoL2JiruTvMtJQj/CKCLRqcxjt4eZA2nZFp2RDwnaBtEv23x8vxQo8AI9DdM= 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: List-Subscribe: List-Unsubscribe: From: Jeff Xu Add code to detect if the vdso is memory sealed, skip the test if it is. Signed-off-by: Jeff Xu Reviewed-by: Kees Cook Reviewed-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett --- .../testing/selftests/x86/test_mremap_vdso.c | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/tools/testing/selftests/x86/test_mremap_vdso.c b/tools/testing/selftests/x86/test_mremap_vdso.c index d53959e03593..94bee6e0c813 100644 --- a/tools/testing/selftests/x86/test_mremap_vdso.c +++ b/tools/testing/selftests/x86/test_mremap_vdso.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -55,13 +56,55 @@ static int try_to_remap(void *vdso_addr, unsigned long size) } +#define VDSO_NAME "[vdso]" +#define VMFLAGS "VmFlags:" +#define MSEAL_FLAGS "sl" +#define MAX_LINE_LEN 512 + +bool vdso_sealed(FILE *maps) +{ + char line[MAX_LINE_LEN]; + bool has_vdso = false; + + while (fgets(line, sizeof(line), maps)) { + if (strstr(line, VDSO_NAME)) + has_vdso = true; + + if (has_vdso && !strncmp(line, VMFLAGS, strlen(VMFLAGS))) { + if (strstr(line, MSEAL_FLAGS)) + return true; + + return false; + } + } + + return false; +} + int main(int argc, char **argv, char **envp) { pid_t child; + FILE *maps; ksft_print_header(); ksft_set_plan(1); + maps = fopen("/proc/self/smaps", "r"); + if (!maps) { + ksft_test_result_skip( + "Could not open /proc/self/smaps, errno=%d\n", + errno); + + return 0; + } + + if (vdso_sealed(maps)) { + ksft_test_result_skip("vdso is sealed\n"); + return 0; + } + + fclose(maps); + child = fork(); if (child == -1) ksft_exit_fail_msg("failed to fork (%d): %m\n", errno); -- 2.48.1.711.g2feabab25a-goog