[LTP] [PATCH 2/2] mq_timedreceive01: Workaround segfault on libc variant on 32 bit

[Petr Vorel]

EFAULT test segfaults on newer kernels (e.g. 6.4) on libc variant on
32bit.  Similarly to 1d4d5a0750 use typical LTP workaround to test by
forked child + checking the terminating signal.

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
 .../mq_timedreceive/mq_timedreceive01.c       | 78 ++++++++++++++-----
 1 file changed, 58 insertions(+), 20 deletions(-)

diff --git a/testcases/kernel/syscalls/mq_timedreceive/mq_timedreceive01.c b/testcases/kernel/syscalls/mq_timedreceive/mq_timedreceive01.c
index d4f447d047..a5a43a1771 100644
--- a/testcases/kernel/syscalls/mq_timedreceive/mq_timedreceive01.c
+++ b/testcases/kernel/syscalls/mq_timedreceive/mq_timedreceive01.c
@@ -129,32 +129,16 @@ static void setup(void)
 	setup_common();
 }
 
-static void do_test(unsigned int i)
+
+static void verify_mqt_receive(unsigned int i, pid_t pid)
 {
 	struct time64_variants *tv = &variants[tst_variant];
 	const struct test_case *tc = &tcase[i];
-	unsigned int j;
-	unsigned int prio;
 	size_t len = MAX_MSGSIZE;
 	char rmsg[len];
-	pid_t pid = -1;
 	void *abs_timeout;
-
-	tst_ts_set_sec(&ts, tc->tv_sec);
-	tst_ts_set_nsec(&ts, tc->tv_nsec);
-
-	if (tc->signal)
-		pid = set_sig(tc->rq, tv->clock_gettime);
-
-	if (tc->timeout)
-		set_timeout(tc->rq, tv->clock_gettime);
-
-	if (tc->send) {
-		if (tv->mqt_send(*tc->fd, smsg, tc->len, tc->prio, NULL) < 0) {
-			tst_res(TFAIL | TTERRNO, "mq_timedsend() failed");
-			return;
-		}
-	}
+	unsigned int j;
+	unsigned int prio;
 
 	if (tc->invalid_msg)
 		len -= 1;
@@ -208,6 +192,60 @@ static void do_test(unsigned int i)
 			TST_RET, prio, len);
 }
 
+static void test_bad_addr(unsigned int i)
+{
+	struct time64_variants *tv = &variants[tst_variant];
+	pid_t pid;
+	int status;
+
+	pid = SAFE_FORK();
+	if (!pid) {
+		verify_mqt_receive(i, pid);
+		_exit(0);
+	}
+
+	SAFE_WAITPID(pid, &status, 0);
+
+	if (WIFEXITED(status) && !WEXITSTATUS(status))
+		return;
+
+	if (tv->ts_type == TST_LIBC_TIMESPEC &&
+		WIFSIGNALED(status) && WTERMSIG(status) == SIGSEGV) {
+		tst_res(TPASS, "Child killed by expected signal");
+		return;
+	}
+
+	tst_res(TFAIL, "Child %s", tst_strstatus(status));
+}
+
+static void do_test(unsigned int i)
+{
+	struct time64_variants *tv = &variants[tst_variant];
+	const struct test_case *tc = &tcase[i];
+	pid_t pid = -1;
+
+	tst_ts_set_sec(&ts, tc->tv_sec);
+	tst_ts_set_nsec(&ts, tc->tv_nsec);
+
+	if (tc->bad_ts_addr) {
+		test_bad_addr(i);
+		return;
+	}
+
+	if (tc->signal)
+		pid = set_sig(tc->rq, tv->clock_gettime);
+
+	if (tc->timeout)
+		set_timeout(tc->rq, tv->clock_gettime);
+
+	if (tc->send && tv->mqt_send(*tc->fd, smsg, tc->len, tc->prio, NULL) < 0) {
+		tst_res(TFAIL | TTERRNO, "mq_timedsend() failed");
+		return;
+	}
+
+	verify_mqt_receive(i, pid);
+}
+
 static struct tst_test test = {
 	.tcnt = ARRAY_SIZE(tcase),
 	.test = do_test,
-- 
2.47.0