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Date: Mon, 23 Mar 2020 12:23:45 -0700
From: Kees Cook <keescook@...omium.org>
To: shuah <shuah@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>,
Will Drewry <wad@...omium.org>,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] selftests/harness: Move test child waiting logic
On Mon, Mar 23, 2020 at 12:08:13PM -0600, shuah wrote:
> Hi Kees,
>
> On 3/13/20 5:12 PM, Kees Cook wrote:
> > In order to better handle timeout failures, rearrange the child waiting
> > logic into a separate function. This is mostly a copy/paste with an
> > indentation change. To handle pid tracking, a new field is added for
> > the child pid. Also move the alarm() pairing into the function.
> >
> > Signed-off-by: Kees Cook <keescook@...omium.org>
>
> Sorry for the delay. I was on vacation all of last week
> and totally trying to stay away from checking email.
Indeed; that's what vacation is for! :)
> My commit scripts falied on checkpatch warnings.
All the macros in this file tend to anger checkpatch. ;)
>
> A couple of comments below:
>
>
> > ---
> > tools/testing/selftests/kselftest_harness.h | 93 +++++++++++----------
> > 1 file changed, 49 insertions(+), 44 deletions(-)
> > > diff --git a/tools/testing/selftests/kselftest_harness.h
> b/tools/testing/selftests/kselftest_harness.h
> > index 5336b26506ab..c7b67e379219 100644
> > --- a/tools/testing/selftests/kselftest_harness.h
> > +++ b/tools/testing/selftests/kselftest_harness.h
> > @@ -635,6 +635,7 @@
> > struct __test_metadata {
> > const char *name;
> > void (*fn)(struct __test_metadata *);
> > + pid_t pid; /* pid of test when being run */
> > int termsig;
> > int passed;
> > int trigger; /* extra handler after the evaluation */
> > @@ -695,64 +696,68 @@ static inline int __bail(int for_realz, bool no_print, __u8 step)
> > return 0;
> > }
> > -void __run_test(struct __test_metadata *t)
> > +void __wait_for_test(struct __test_metadata *t)
> > {
> > - pid_t child_pid;
> > int status;
> > + alarm(t->timeout);
> > + waitpid(t->pid, &status, 0);
> > + alarm(0);
> > +
> > + if (WIFEXITED(status)) {
> > + 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));
>
> This one isn't an error and gets printed to stderr? Except for
> this one message, all other messages in this routine are indeed
> errors. It makes sense to print this out to stdout instead.
No, this is an error. A signal was _expected_ in this case, but the
program exited without a signal. i.e. the test case failed, and the
error is reported to stderr.
(This portion, btw, is just moved from below.)
>
> > + } 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;
> > + if (WTERMSIG(status) == SIGABRT) {
> > + fprintf(TH_LOG_STREAM,
> > + "%s: Test terminated by assertion\n",
> > + t->name);
> > + } else if (WTERMSIG(status) == t->termsig) {
> > + t->passed = 1;
> > + } else {
> > + fprintf(TH_LOG_STREAM,
> > + "%s: Test terminated unexpectedly "
> > + "by signal %d\n",
> > + t->name,
> > + WTERMSIG(status));
> > + }
> > + } else {
> > + fprintf(TH_LOG_STREAM,
> > + "%s: Test ended in some other way [%u]\n",
> > + t->name,
> > + status);
> > + }
> > +}
> > +
> > +void __run_test(struct __test_metadata *t)
> > +{
> > t->passed = 1;
> > t->trigger = 0;
> > printf("[ RUN ] %s\n", t->name);
> > - alarm(t->timeout);
> > - child_pid = fork();
> > - if (child_pid < 0) {
> > + t->pid = fork();
> > + if (t->pid < 0) {
> > printf("ERROR SPAWNING TEST CHILD\n");
> > t->passed = 0;
> > - } else if (child_pid == 0) {
> > + } else if (t->pid == 0) {
> > t->fn(t);
> > /* 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;
> > - 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;
> > - if (WTERMSIG(status) == SIGABRT) {
> > - fprintf(TH_LOG_STREAM,
> > - "%s: Test terminated by assertion\n",
> > - t->name);
> > - } else if (WTERMSIG(status) == t->termsig) {
> > - t->passed = 1;
> > - } else {
> > - fprintf(TH_LOG_STREAM,
> > - "%s: Test terminated unexpectedly "
> > - "by signal %d\n",
> > - t->name,
> > - WTERMSIG(status));
> > - }
> > - } else {
> > - fprintf(TH_LOG_STREAM,
> > - "%s: Test ended in some other way [%u]\n",
> > - t->name,
> > - status);
> > - }
> > + __wait_for_test(t);
> > }
> > printf("[ %4s ] %s\n", (t->passed ? "OK" : "FAIL"), t->name);
> > - alarm(0);
> > }
> > static int test_harness_run(int __attribute__((unused)) argc,
> >
>
> thanks,
> -- Shuah
Hopefully that clears it up. I don't see anything to change for a v2?
Did I miss anything?
Thanks!
-Kees
--
Kees Cook
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