* jeffxu@chromium.org jeffxu@chromium.org [250303 00:09]:
From: Jeff Xu jeffxu@chromium.org
Add code to detect if the vdso is memory sealed, skip the test if it is.
Signed-off-by: Jeff Xu jeffxu@chromium.org Reviewed-by: Kees Cook kees@kernel.org Reviewed-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com
Reviewed-by: Liam R. Howlett Liam.Howlett@oracle.com
.../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 <errno.h> #include <unistd.h> #include <string.h> +#include <stdbool.h> #include <sys/mman.h> #include <sys/auxv.h> @@ -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