[PATCH] kselftest: Fix vdso_test_abi return status

Vincenzo Frascino
2022-01-26T12:26:22Z

vdso_test_abi contains a batch of tests that verify the validity of the
vDSO ABI.

When a vDSO symbol is not found the relevant test is skipped reporting
KSFT_SKIP. All the tests return values are then added in a single
variable which is checked to verify failures. This approach can have
side effects which result in reporting the wrong kselftest exit status.

Fix vdso_test_abi verifying the return code of each test separately.

Cc: Shuah Khan <shuah@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
tools/testing/selftests/vDSO/vdso_test_abi.c | 27 +++++++++++---------
1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/vDSO/vdso_test_abi.c b/tools/testing/selftests/vDSO/vdso_test_abi.c
index 3d603f1394af..3a4efb91b9b2 100644
--- a/tools/testing/selftests/vDSO/vdso_test_abi.c
+++ b/tools/testing/selftests/vDSO/vdso_test_abi.c
@@ -184,10 +184,12 @@ static inline int vdso_test_clock(clockid_t clock_id)
return ret0;
}

+#define VDSO_TESTS_MAX 9
+
int main(int argc, char **argv)
{
unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
- int ret;
+ int ret[VDSO_TESTS_MAX] = {0};

if (!sysinfo_ehdr) {
printf("AT_SYSINFO_EHDR is not present!\n");
@@ -201,44 +203,45 @@ int main(int argc, char **argv)

vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));

- ret = vdso_test_gettimeofday();
+ ret[0] = vdso_test_gettimeofday();

#if _POSIX_TIMERS > 0

#ifdef CLOCK_REALTIME
- ret += vdso_test_clock(CLOCK_REALTIME);
+ ret[1] = vdso_test_clock(CLOCK_REALTIME);
#endif

#ifdef CLOCK_BOOTTIME
- ret += vdso_test_clock(CLOCK_BOOTTIME);
+ ret[2] = vdso_test_clock(CLOCK_BOOTTIME);
#endif

#ifdef CLOCK_TAI
- ret += vdso_test_clock(CLOCK_TAI);
+ ret[3] = vdso_test_clock(CLOCK_TAI);
#endif

#ifdef CLOCK_REALTIME_COARSE
- ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
+ ret[4] = vdso_test_clock(CLOCK_REALTIME_COARSE);
#endif

#ifdef CLOCK_MONOTONIC
- ret += vdso_test_clock(CLOCK_MONOTONIC);
+ ret[5] = vdso_test_clock(CLOCK_MONOTONIC);
#endif

#ifdef CLOCK_MONOTONIC_RAW
- ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
+ ret[6] = vdso_test_clock(CLOCK_MONOTONIC_RAW);
#endif

#ifdef CLOCK_MONOTONIC_COARSE
- ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
+ ret[7] = vdso_test_clock(CLOCK_MONOTONIC_COARSE);
#endif

#endif

- ret += vdso_test_time();
+ ret[8] = vdso_test_time();

- if (ret > 0)
- return KSFT_FAIL;
+ for (int i = 0; i < VDSO_TESTS_MAX; i++)
+ if (ret[i] == KSFT_FAIL)
+ return KSFT_FAIL;

return KSFT_PASS;
}
--
2.34.1