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selftests: Enhance kselftest_harness.h to print which assert failed 

When a test process is not able to write to TH_LOG_STREAM, this step
mechanism enable to print the assert number which triggered the failure.
This can be enabled by setting _metadata->no_print to true at the
beginning of the test sequence.

Update the seccomp-bpf test to return 0 if a test succeeded.

This feature is needed for the Landlock tests.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Will Drewry <wad@chromium.org>
Link: https://lkml.kernel.org/r/CAGXu5j+D-FP8Kt9unNOqKrQJP4DYTpmgkJxWykZyrYiVPz3Y3Q@mail.gmail.com
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
Mickaël Salaün 2017-08-07 01:23:37 +02:00 committed by Shuah Khan
parent 1f87c7c15d
commit 369130b631
2 changed files with 35 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
tools/testing/selftests/kselftest_harness.h
View File

@ -51,6 +51,9 @@
#define __KSELFTEST_HARNESS_H
#define _GNU_SOURCE
#include <asm/types.h>
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
@ -84,6 +87,14 @@
* E.g., #define TH_LOG_ENABLED 1
*
* If no definition is provided, logging is enabled by default.
*
* If there is no way to print an error message for the process running the
* test (e.g. not allowed to write to stderr), it is still possible to get the
* ASSERT_* number for which the test failed. This behavior can be enabled by
* writing `_metadata->no_print = true;` before the check sequence that is
* unable to print. When an error occur, instead of printing an error message
* and calling `abort(3)`, the test process call `_exit(2)` with the assert
* number as argument, which is then printed by the parent process.
*/
#define TH_LOG(fmt, ...) do { \
if (TH_LOG_ENABLED) \
@ -555,12 +566,18 @@
* return while still providing an optional block to the API consumer.
*/
#define OPTIONAL_HANDLER(_assert) \
for (; _metadata->trigger; _metadata->trigger = __bail(_assert))
for (; _metadata->trigger; _metadata->trigger = \
__bail(_assert, _metadata->no_print, _metadata->step))
#define __INC_STEP(_metadata) \
if (_metadata->passed && _metadata->step < 255) \
_metadata->step++;
#define __EXPECT(_expected, _seen, _t, _assert) do { \
/* Avoid multiple evaluation of the cases */ \
__typeof__(_expected) __exp = (_expected); \
__typeof__(_seen) __seen = (_seen); \
if (_assert) __INC_STEP(_metadata); \
if (!(__exp _t __seen)) { \
unsigned long long __exp_print = (uintptr_t)__exp; \
unsigned long long __seen_print = (uintptr_t)__seen; \
@ -576,6 +593,7 @@
#define __EXPECT_STR(_expected, _seen, _t, _assert) do { \
const char *__exp = (_expected); \
const char *__seen = (_seen); \
if (_assert) __INC_STEP(_metadata); \
if (!(strcmp(__exp, __seen) _t 0)) { \
__TH_LOG("Expected '%s' %s '%s'.", __exp, #_t, __seen); \
_metadata->passed = 0; \
@ -590,6 +608,8 @@ struct __test_metadata {
int termsig;
int passed;
int trigger; /* extra handler after the evaluation */
__u8 step;
bool no_print; /* manual trigger when TH_LOG_STREAM is not available */
struct __test_metadata *prev, *next;
};
@ -634,10 +654,13 @@ static inline void __register_test(struct __test_metadata *t)
}
}
static inline int __bail(int for_realz)
static inline int __bail(int for_realz, bool no_print, __u8 step)
{
if (for_realz)
if (for_realz) {
if (no_print)
_exit(step);
abort();
}
return 0;
}
@ -655,18 +678,24 @@ void __run_test(struct __test_metadata *t)
t->passed = 0;
} else if (child_pid == 0) {
t->fn(t);
_exit(t->passed);
/* return the step that failed or 0 */
_exit(t->passed ? 0 : t->step);
} else {
/* TODO(wad) add timeout support. */
waitpid(child_pid, &status, 0);
if (WIFEXITED(status)) {
t->passed = t->termsig == -1 ? WEXITSTATUS(status) : 0;
t->passed = t->termsig == -1 ? !WEXITSTATUS(status) : 0;
if (t->termsig != -1) {
fprintf(TH_LOG_STREAM,
"%s: Test exited normally "
"instead of by signal (code: %d)\n",
t->name,
WEXITSTATUS(status));
} else if (!t->passed) {
fprintf(TH_LOG_STREAM,
"%s: Test failed at step #%d\n",
t->name,
WEXITSTATUS(status));
}
} else if (WIFSIGNALED(status)) {
t->passed = 0;

2
tools/testing/selftests/seccomp/seccomp_bpf.c
View File

@ -107,7 +107,7 @@ TEST(mode_strict_support)
ASSERT_EQ(0, ret) {
TH_LOG("Kernel does not support CONFIG_SECCOMP");
}
syscall(__NR_exit, 1);
syscall(__NR_exit, 0);
}
TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)