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[34.83.59.201]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-220d5349634sm180515125ad.31.2025.02.24.09.45.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 24 Feb 2025 09:45:16 -0800 (PST) From: jeffxu@chromium.org To: akpm@linux-foundation.org, keescook@chromium.org, jannh@google.com, torvalds@linux-foundation.org, vbabka@suse.cz, lorenzo.stoakes@oracle.com, Liam.Howlett@Oracle.com, adhemerval.zanella@linaro.org, oleg@redhat.com, avagin@gmail.com, benjamin@sipsolutions.net Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org, jorgelo@chromium.org, sroettger@google.com, hch@lst.de, ojeda@kernel.org, thomas.weissschuh@linutronix.de, adobriyan@gmail.com, johannes@sipsolutions.net, pedro.falcato@gmail.com, hca@linux.ibm.com, willy@infradead.org, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, mpe@ellerman.id.au, aleksandr.mikhalitsyn@canonical.com, mike.rapoport@gmail.com, Jeff Xu Subject: [PATCH v6 2/7] selftests: x86: test_mremap_vdso: skip if vdso is msealed Date: Mon, 24 Feb 2025 17:45:08 +0000 Message-ID: <20250224174513.3600914-3-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.658.g4767266eb4-goog In-Reply-To: <20250224174513.3600914-1-jeffxu@google.com> References: <20250224174513.3600914-1-jeffxu@google.com> MIME-Version: 1.0 X-Stat-Signature: 9rb3hg4wb65afrngnac1srcb66y5wasa X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 4B7E240014 X-Rspam-User: X-HE-Tag: 1740419118-277441 X-HE-Meta: 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 qkIrlmtv XapN7Q8jS/gqHXUfS6Uf1r9MmIr04MfP5MjG1RNz7tbGf2eTHkUEo7dcOSfo2l5yuoE4HkaxuV8J4BLwy4Hf/cZX4ifXLJKXbS5iCg8bzERZFTkINz6MHE7LrMGB9rIRlBhqSdrGIu6oiUrfsxtI2kMAbd0jQW07/j/i5qFrNGoS1kbBFIuUSdEYGOb0t7qGlDIMBSP0gSO0lfd1anefs6Ig0omB9eG9ca6w5iqlXJL+An7HFbNjoqlx7osvMhISqO/eEPdeihBEi6p1c9HOTq0x3ygrhr59AZIexbD/5b/pvCqpf/g3Tofb5n8k3UKYvPQ9Wjn4NPBo9p5888d9QMeyNbhNgNQiFSvQUZs1Dsl4PGNbwN9KUuGQof7SVnyuS74XNs378MqQQZLCBR5L0f9K6wX3m0cZBksESt2v66CMS+1n4vzNwUv2zgp0Ft7hQKLdnfdZP02SFf3Q= 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 --- .../testing/selftests/x86/test_mremap_vdso.c | 38 +++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tools/testing/selftests/x86/test_mremap_vdso.c b/tools/testing/selftests/x86/test_mremap_vdso.c index d53959e03593..c68077c56b22 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 +56,50 @@ 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\n"); + return 0; + } + + if (vdso_sealed(maps)) { + ksft_test_result_skip("vdso is sealed\n"); + return 0; + } + child = fork(); if (child == -1) ksft_exit_fail_msg("failed to fork (%d): %m\n", errno);