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[35.204.162.40]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5e4c3fb6067sm6248635a12.50.2025.03.02.21.09.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 02 Mar 2025 21:09:31 -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, linux-kselftest@vger.kernel.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 , Kees Cook Subject: [PATCH v8 2/7] selftests: x86: test_mremap_vdso: skip if vdso is msealed Date: Mon, 3 Mar 2025 05:09:16 +0000 Message-ID: <20250303050921.3033083-3-jeffxu@google.com> X-Mailer: git-send-email 2.48.1.711.g2feabab25a-goog In-Reply-To: <20250303050921.3033083-1-jeffxu@google.com> References: <20250303050921.3033083-1-jeffxu@google.com> MIME-Version: 1.0 X-Rspamd-Server: rspam02 X-Stat-Signature: hpur64xzzide88zocruikdixcu716jrp X-Rspamd-Queue-Id: DB6C3100005 X-Rspam-User: X-HE-Tag: 1740978573-594333 X-HE-Meta: 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 HRQPeahT 5RU6eUZna71uaw/3+y5tIqgU1MiRP8SGIZsx4tmObAoWmBAFwUKowgQEJaKqqqDuozhr6ggrr0v1nkohsSc358ijvW7w8rWIvcteYstV4PnwJmB7OlMWvpXIhgDs56NgsKTzYS8Y/O1toBx+5dDwKnAbYDVuO61tLbFAr/4cXPSnbYboGS9DaPvjxdBdMgbRiX5G4s6hhRwf39Z+ngFl836K4GAZxXAdsSceJJ69aDWCvu1qQtV4BNg8YyUpto8nRGD7vAfeKsronHmdnDL8ODoxnzqvMB0BxBcM+XWtPlaObd8fiKu6ktZm98s+MkRWiXbbNsD37SjQmlDSrzRz4roWvnQx8NjUjA9vNtoguNLp/nf5rD3OlzAyNPOC0Gv6gRHD4xWUYdI233/bwEOZpEPlIWS1JD/sXc/Xn95pUrI/dFXe0GnBp+RfIT+UuoUAXytGxDaGgf3/Uias= 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);