The soname from the vDSO is not a public API. Furthermore it requires libc to implement dlsym() and friends.
Use the facilities from parse_vdso.c instead which uses the official vDSO ABI to find it, aligned with the other vDSO selftests. Signed-off-by: Thomas Weißschuh <[email protected]> --- tools/testing/selftests/vDSO/Makefile | 4 +-- .../testing/selftests/vDSO/vdso_test_correctness.c | 30 ++++++++++------------ 2 files changed, 14 insertions(+), 20 deletions(-) diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile index 74dfc60e636edce91cc1df9643ca8aa008ecfe65..504b30155ae7c6da3065c4472384f54e5547332a 100644 --- a/tools/testing/selftests/vDSO/Makefile +++ b/tools/testing/selftests/vDSO/Makefile @@ -26,13 +26,11 @@ CFLAGS_NOLIBC := -nostdlib -nostdinc -ffreestanding -fno-asynchronous-unwind-tab $(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c $(OUTPUT)/vdso_test_getcpu: parse_vdso.c vdso_test_getcpu.c $(OUTPUT)/vdso_test_abi: parse_vdso.c vdso_test_abi.c +$(OUTPUT)/vdso_test_correctness: parse_vdso.c vdso_test_correctness.c $(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c | headers $(OUTPUT)/vdso_standalone_test_x86: CFLAGS:=$(CFLAGS_NOLIBC) $(CFLAGS) -$(OUTPUT)/vdso_test_correctness: vdso_test_correctness.c -$(OUTPUT)/vdso_test_correctness: LDFLAGS += -ldl - $(OUTPUT)/vdso_test_getrandom: parse_vdso.c $(OUTPUT)/vdso_test_getrandom: CFLAGS += -isystem $(top_srcdir)/tools/include \ $(KHDR_INCLUDES) \ diff --git a/tools/testing/selftests/vDSO/vdso_test_correctness.c b/tools/testing/selftests/vDSO/vdso_test_correctness.c index ac5fa3e906806c28d3238e6f4e767e370932c5d1..310688e1379511e2c564b460c6379cc00b7a5f9a 100644 --- a/tools/testing/selftests/vDSO/vdso_test_correctness.c +++ b/tools/testing/selftests/vDSO/vdso_test_correctness.c @@ -10,20 +10,22 @@ #include <time.h> #include <stdlib.h> #include <unistd.h> +#include <sys/auxv.h> #include <sys/syscall.h> -#include <dlfcn.h> #include <string.h> #include <errno.h> #include <sched.h> #include <stdbool.h> #include <limits.h> +#include "parse_vdso.h" #include "vdso_config.h" #include "vdso_call.h" #include "vdso_syscalls.h" #include "vdso_types.h" #include "../kselftest.h" +static const char *version; static const char **name; #ifndef __NR_clock_gettime64 @@ -88,39 +90,32 @@ static void *vsyscall_getcpu(void) static void fill_function_pointers(void) { - void *vdso = dlopen("linux-vdso.so.1", - RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); - if (!vdso) - vdso = dlopen("linux-gate.so.1", - RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); - if (!vdso) - vdso = dlopen("linux-vdso32.so.1", - RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); - if (!vdso) - vdso = dlopen("linux-vdso64.so.1", - RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD); - if (!vdso) { + unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); + + if (!sysinfo_ehdr) { printf("[WARN]\tfailed to find vDSO\n"); return; } - vdso_getcpu = (getcpu_t)dlsym(vdso, name[4]); + vdso_init_from_sysinfo_ehdr(sysinfo_ehdr); + + vdso_getcpu = (getcpu_t)vdso_sym(version, name[4]); if (!vdso_getcpu) printf("Warning: failed to find getcpu in vDSO\n"); vgetcpu = (getcpu_t) vsyscall_getcpu(); - vdso_clock_gettime = (vdso_clock_gettime_t)dlsym(vdso, name[1]); + vdso_clock_gettime = (vdso_clock_gettime_t)vdso_sym(version, name[1]); if (!vdso_clock_gettime) printf("Warning: failed to find clock_gettime in vDSO\n"); #if defined(VDSO_32BIT) - vdso_clock_gettime64 = (vdso_clock_gettime64_t)dlsym(vdso, name[5]); + vdso_clock_gettime64 = (vdso_clock_gettime64_t)vdso_sym(version, name[5]); if (!vdso_clock_gettime64) printf("Warning: failed to find clock_gettime64 in vDSO\n"); #endif - vdso_gettimeofday = (vdso_gettimeofday_t)dlsym(vdso, name[0]); + vdso_gettimeofday = (vdso_gettimeofday_t)vdso_sym(version, name[0]); if (!vdso_gettimeofday) printf("Warning: failed to find gettimeofday in vDSO\n"); @@ -398,6 +393,7 @@ static void test_gettimeofday(void) int main(int argc, char **argv) { + version = versions[VDSO_VERSION]; name = (const char **)&names[VDSO_NAMES]; fill_function_pointers(); -- 2.51.0
