[LTP] [PATCH] memcg_test_2.c: clear all fields of sigaction structure

[Jan Stancek <jstancek@redhat.com>]

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This test didn't set all fields of sigaction structure before
using it, which caused some of them to be left in random state.
Namely sa_flags could end up with SA_RESTORER, which after
receiving signal would call invalid pointer in sa_restorer.

Something, we apparently hit here:
Bug 731954 - segfault on s390x when setting memory.limit_in_bytes
https://bugzilla.redhat.com/show_bug.cgi?id=731954

Fix this by zero-ing whole structure before usage.
Clearing just sa_flags should be enough, but let's match the style
of other test in this group: memcg_test_4.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
---
  .../controllers/memcg/regression/memcg_test_2.c    |    4 ++--
  1 files changed, 2 insertions(+), 2 deletions(-)



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diff --git a/testcases/kernel/controllers/memcg/regression/memcg_test_2.c b/testcases/kernel/controllers/memcg/regression/memcg_test_2.c
index e147e27..1643408 100644
--- a/testcases/kernel/controllers/memcg/regression/memcg_test_2.c
+++ b/testcases/kernel/controllers/memcg/regression/memcg_test_2.c
@@ -41,7 +41,7 @@ int main(void)
 {
 	struct sigaction sigusr_action;
 
-	sigemptyset(&sigusr_action.sa_mask);
+	memset(&sigusr_action, 0, sizeof(sigusr_action));
 	sigusr_action.sa_handler = &sigusr_handler;
 	sigaction(SIGUSR1, &sigusr_action, NULL);
 
@@ -49,4 +49,4 @@ int main(void)
 		sleep(1);
 
 	return 0;
-}
\ No newline at end of file
+}


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