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Message-ID: <20220128125525.GB5776@e120937-lin>
Date: Fri, 28 Jan 2022 12:55:25 +0000
From: Cristian Marussi <cristian.marussi@....com>
To: Vincenzo Frascino <vincenzo.frascino@....com>
Cc: linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
Shuah Khan <shuah@...nel.org>,
Andy Lutomirski <luto@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2] kselftest: Fix vdso_test_abi return status
On Fri, Jan 28, 2022 at 12:27:44PM +0000, Vincenzo Frascino wrote:
> 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@...nel.org>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Reported-by: Cristian Marussi <cristian.marussi@....com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> ---
Hi Vincenzo,
> tools/testing/selftests/vDSO/vdso_test_abi.c | 143 ++++++++-----------
> 1 file changed, 62 insertions(+), 81 deletions(-)
>
> diff --git a/tools/testing/selftests/vDSO/vdso_test_abi.c b/tools/testing/selftests/vDSO/vdso_test_abi.c
> index 3d603f1394af..3e4dd47e404e 100644
> --- a/tools/testing/selftests/vDSO/vdso_test_abi.c
> +++ b/tools/testing/selftests/vDSO/vdso_test_abi.c
> @@ -33,110 +33,106 @@ typedef long (*vdso_clock_gettime_t)(clockid_t clk_id, struct timespec *ts);
> typedef long (*vdso_clock_getres_t)(clockid_t clk_id, struct timespec *ts);
> typedef time_t (*vdso_time_t)(time_t *t);
>
> -static int vdso_test_gettimeofday(void)
> +#define VDSO_TEST_PASS_MSG() "\n%s(): PASS\n", __func__
> +#define VDSO_TEST_FAIL_MSG(x) "\n%s(): %s FAIL\n", __func__, x
> +#define VDSO_TEST_SKIP_MSG(x) "\n%s(): SKIP: Could not find %s\n", __func__, x
> +
> +static void vdso_test_gettimeofday(void)
> {
> /* Find gettimeofday. */
> vdso_gettimeofday_t vdso_gettimeofday =
> (vdso_gettimeofday_t)vdso_sym(version, name[0]);
>
> - if (!vdso_gettimeofday) {
> - printf("Could not find %s\n", name[0]);
> - return KSFT_SKIP;
> - }
> + if (!vdso_gettimeofday)
> + ksft_test_result_skip(VDSO_TEST_SKIP_MSG(name[0]));
>
> struct timeval tv;
> long ret = vdso_gettimeofday(&tv, 0);
>
> if (ret == 0) {
> - printf("The time is %lld.%06lld\n",
> - (long long)tv.tv_sec, (long long)tv.tv_usec);
> + ksft_print_msg("The time is %lld.%06lld\n",
> + (long long)tv.tv_sec, (long long)tv.tv_usec);
> + ksft_test_result_pass(VDSO_TEST_PASS_MSG());
> } else {
> - printf("%s failed\n", name[0]);
> - return KSFT_FAIL;
> + ksft_test_result_fail(VDSO_TEST_FAIL_MSG(name[0]));
> }
> -
> - return KSFT_PASS;
> }
>
> -static int vdso_test_clock_gettime(clockid_t clk_id)
> +static void vdso_test_clock_gettime(clockid_t clk_id)
> {
> /* Find clock_gettime. */
> vdso_clock_gettime_t vdso_clock_gettime =
> (vdso_clock_gettime_t)vdso_sym(version, name[1]);
>
> - if (!vdso_clock_gettime) {
> - printf("Could not find %s\n", name[1]);
> - return KSFT_SKIP;
> - }
> + if (!vdso_clock_gettime)
> + ksft_test_result_skip(VDSO_TEST_SKIP_MSG(name[1]));
>
> struct timespec ts;
> long ret = vdso_clock_gettime(clk_id, &ts);
>
> if (ret == 0) {
> - printf("The time is %lld.%06lld\n",
> - (long long)ts.tv_sec, (long long)ts.tv_nsec);
> + ksft_print_msg("The time is %lld.%06lld\n",
> + (long long)ts.tv_sec, (long long)ts.tv_nsec);
> + ksft_test_result_pass(VDSO_TEST_PASS_MSG());;
> } else {
> - printf("%s failed\n", name[1]);
> - return KSFT_FAIL;
> + ksft_test_result_fail(VDSO_TEST_FAIL_MSG(name[1]));
> }
> -
> - return KSFT_PASS;
> }
>
> -static int vdso_test_time(void)
> +static void vdso_test_time(void)
> {
> /* Find time. */
> vdso_time_t vdso_time =
> (vdso_time_t)vdso_sym(version, name[2]);
>
> - if (!vdso_time) {
> - printf("Could not find %s\n", name[2]);
> - return KSFT_SKIP;
> - }
> + if (!vdso_time)
> + ksft_test_result_skip(VDSO_TEST_SKIP_MSG(name[2]));
>
> long ret = vdso_time(NULL);
>
> if (ret > 0) {
> - printf("The time in hours since January 1, 1970 is %lld\n",
> + ksft_print_msg("The time in hours since January 1, 1970 is %lld\n",
> (long long)(ret / 3600));
> + ksft_test_result_pass(VDSO_TEST_PASS_MSG());
> } else {
> - printf("%s failed\n", name[2]);
> - return KSFT_FAIL;
> + ksft_test_result_fail(VDSO_TEST_FAIL_MSG(name[2]));
> }
> -
> - return KSFT_PASS;
> }
>
> -static int vdso_test_clock_getres(clockid_t clk_id)
> +static void vdso_test_clock_getres(clockid_t clk_id)
> {
> + int clock_getres_fail = 0;
> +
> /* Find clock_getres. */
> vdso_clock_getres_t vdso_clock_getres =
> (vdso_clock_getres_t)vdso_sym(version, name[3]);
>
> - if (!vdso_clock_getres) {
> - printf("Could not find %s\n", name[3]);
> - return KSFT_SKIP;
> - }
> + if (!vdso_clock_getres)
> + ksft_test_result_skip(VDSO_TEST_SKIP_MSG(name[3]));
>
> struct timespec ts, sys_ts;
> long ret = vdso_clock_getres(clk_id, &ts);
>
> if (ret == 0) {
> - printf("The resolution is %lld %lld\n",
> - (long long)ts.tv_sec, (long long)ts.tv_nsec);
> + ksft_print_msg("The vdso resolution is %lld %lld\n",
> + (long long)ts.tv_sec, (long long)ts.tv_nsec);
> } else {
> - printf("%s failed\n", name[3]);
> - return KSFT_FAIL;
> + clock_getres_fail++;
> }
>
> ret = syscall(SYS_clock_getres, clk_id, &sys_ts);
>
> - if ((sys_ts.tv_sec != ts.tv_sec) || (sys_ts.tv_nsec != ts.tv_nsec)) {
> - printf("%s failed\n", name[3]);
> - return KSFT_FAIL;
> - }
> + ksft_print_msg("The syscall resolution is %lld %lld\n",
> + (long long)sys_ts.tv_sec, (long long)sys_ts.tv_nsec);
> +
> + if ((sys_ts.tv_sec != ts.tv_sec) || (sys_ts.tv_nsec != ts.tv_nsec))
> + clock_getres_fail++;
>
> - return KSFT_PASS;
> + if (clock_getres_fail > 0) {
> + ksft_test_result_fail(VDSO_TEST_FAIL_MSG(name[3]));
> + } else {
> + ksft_test_result_pass(VDSO_TEST_PASS_MSG());
> + }
> }
>
> const char *vdso_clock_name[12] = {
> @@ -158,36 +154,23 @@ const char *vdso_clock_name[12] = {
> * This function calls vdso_test_clock_gettime and vdso_test_clock_getres
> * with different values for clock_id.
> */
> -static inline int vdso_test_clock(clockid_t clock_id)
> +static inline void vdso_test_clock(clockid_t clock_id)
> {
> - int ret0, ret1;
> -
> - ret0 = vdso_test_clock_gettime(clock_id);
> - /* A skipped test is considered passed */
> - if (ret0 == KSFT_SKIP)
> - ret0 = KSFT_PASS;
> + ksft_print_msg("\nclock_id: %s\n", vdso_clock_name[clock_id]);
>
> - ret1 = vdso_test_clock_getres(clock_id);
> - /* A skipped test is considered passed */
> - if (ret1 == KSFT_SKIP)
> - ret1 = KSFT_PASS;
> + vdso_test_clock_gettime(clock_id);
>
> - ret0 += ret1;
> -
> - printf("clock_id: %s", vdso_clock_name[clock_id]);
> -
> - if (ret0 > 0)
> - printf(" [FAIL]\n");
> - else
> - printf(" [PASS]\n");
> -
> - return ret0;
> + vdso_test_clock_getres(clock_id);
> }
>
> +#define VDSO_TEST_PLAN 16
> +
> int main(int argc, char **argv)
> {
> unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
> - int ret;
> +
> + ksft_print_header();
> + ksft_set_plan(VDSO_TEST_PLAN);
>
> if (!sysinfo_ehdr) {
> printf("AT_SYSINFO_EHDR is not present!\n");
> @@ -201,44 +184,42 @@ int main(int argc, char **argv)
>
> vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
>
> - ret = vdso_test_gettimeofday();
> + vdso_test_gettimeofday();
>
> #if _POSIX_TIMERS > 0
>
> #ifdef CLOCK_REALTIME
> - ret += vdso_test_clock(CLOCK_REALTIME);
> + vdso_test_clock(CLOCK_REALTIME);
> #endif
>
> #ifdef CLOCK_BOOTTIME
> - ret += vdso_test_clock(CLOCK_BOOTTIME);
> + vdso_test_clock(CLOCK_BOOTTIME);
> #endif
>
> #ifdef CLOCK_TAI
> - ret += vdso_test_clock(CLOCK_TAI);
> + vdso_test_clock(CLOCK_TAI);
> #endif
>
> #ifdef CLOCK_REALTIME_COARSE
> - ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
> + vdso_test_clock(CLOCK_REALTIME_COARSE);
> #endif
>
> #ifdef CLOCK_MONOTONIC
> - ret += vdso_test_clock(CLOCK_MONOTONIC);
> + vdso_test_clock(CLOCK_MONOTONIC);
> #endif
>
> #ifdef CLOCK_MONOTONIC_RAW
> - ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
> + vdso_test_clock(CLOCK_MONOTONIC_RAW);
> #endif
>
> #ifdef CLOCK_MONOTONIC_COARSE
> - ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
> + vdso_test_clock(CLOCK_MONOTONIC_COARSE);
> #endif
>
> #endif
>
> - ret += vdso_test_time();
> -
> - if (ret > 0)
> - return KSFT_FAIL;
> + vdso_test_time();
>
> - return KSFT_PASS;
> + ksft_print_cnts();
> + return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
I gave it a go on JUNO, got a segfault as you can see below.
I think it is simply that now you are accounting properly for the
FAIL/SKIP/PASS like in:
> - if (!vdso_time) {
> - printf("Could not find %s\n", name[2]);
> - return KSFT_SKIP;
> - }
> + if (!vdso_time)
> + ksft_test_result_skip(VDSO_TEST_SKIP_MSG(name[2]));
>
>
BUT you never bail out after the ksft_test_result_skip() so the
test is run anyway.
Thanks,
Cristian
-----
TAP version 13
1..16
[vDSO kselftest] VDSO_VERSION: LINUX_2.6.39
# The time is 1643374139.646062
ok 1
vdso_test_gettimeofday(): PASS
#
clock_id: CLOCK_REALTIME
# The time is 1643374139.646288567
ok 2
vdso_test_clock_gettime(): PASS
# The vdso resolution is 0 1
# The syscall resolution is 0 1
ok 3
vdso_test_clock_getres(): PASS
#
clock_id: CLOCK_BOOTTIME
# The time is 5602.390284127
ok 4
vdso_test_clock_gettime(): PASS
# The vdso resolution is 0 1
# The syscall resolution is 0 1
ok 5
vdso_test_clock_getres(): PASS
#
clock_id: CLOCK_TAI
# The time is 1643374139.647078775
ok 6
vdso_test_clock_gettime(): PASS
# The vdso resolution is 0 1
# The syscall resolution is 0 1
ok 7
vdso_test_clock_getres(): PASS
#
clock_id: CLOCK_REALTIME_COARSE
# The time is 1643374139.641467075
ok 8
vdso_test_clock_gettime(): PASS
# The vdso resolution is 0 4000000
# The syscall resolution is 0 4000000
ok 9
vdso_test_clock_getres(): PASS
#
clock_id: CLOCK_MONOTONIC
# The time is 5602.391454688
ok 10
vdso_test_clock_gettime(): PASS
# The vdso resolution is 0 1
# The syscall resolution is 0 1
ok 11
vdso_test_clock_getres(): PASS
#
clock_id: CLOCK_MONOTONIC_RAW
# The time is 5602.278421300
ok 12
vdso_test_clock_gettime(): PASS
# The vdso resolution is 0 1
# The syscall resolution is 0 1
ok 13
vdso_test_clock_getres(): PASS
#
clock_id: CLOCK_MONOTONIC_COARSE
# The time is 5602.389063303
ok 14
vdso_test_clock_gettime(): PASS
# The vdso resolution is 0 4000000
# The syscall resolution is 0 4000000
ok 15
vdso_test_clock_getres(): PASS
ok 16 # SKIP
vdso_test_time(): SKIP: Could not find __kernel_time
Segmentation fault
>
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