[LTP] [PATCH 2/3] cve-2015-3290: Exit after 1000 failures

[Martin Doucha <mdoucha@suse.cz>]

On some kernels, the new error messages may produce millions of lines
of test output. Limit the maximum number of failures to avoid huge test
logs.

Signed-off-by: Martin Doucha <mdoucha@suse.cz>
---
 testcases/cve/cve-2015-3290.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/testcases/cve/cve-2015-3290.c b/testcases/cve/cve-2015-3290.c
index 4185c22a7..3bdc0f8f0 100644
--- a/testcases/cve/cve-2015-3290.c
+++ b/testcases/cve/cve-2015-3290.c
@@ -178,8 +178,10 @@ static greg_t *csptr(ucontext_t *ctx)
 #endif
 
 #define LDT_SS 0x7
+#define MAX_FAILS 1000
 
 static volatile long expected_rsp;
+static volatile int fail_count;
 static int running = 1;
 
 static void set_ldt(void)
@@ -320,11 +322,13 @@ static void try_corrupt_stack(unsigned short *orig_ss)
 
 	if (!(flags & (1 << 9))) {
 		tst_res(TFAIL, "Interrupt flag is disabled (0x%lx)", flags);
+		fail_count++;
 	}
 
 	if (new_ss != LDT_SS) {
 		tst_res(TFAIL, "Wrong stack selector 0x%lx, expected 0x%x",
 			new_ss, LDT_SS);
+		fail_count++;
 	}
 }
 
@@ -417,6 +421,11 @@ static void *child_thread(void *arg)
 		 * the system.
 		 */
 		syscall(0x3fffffff);
+
+		if (fail_count >= MAX_FAILS) {
+			tst_res(TINFO, "Too many failures, exiting");
+			break;
+		}
 	}
 
 	for (i = 0; i < ARRAY_SIZE(perf_events); i++)
@@ -456,6 +465,9 @@ static void do_child(void)
 	free(orig_ss);
 	free(threads);
 
+	if (fail_count)
+		exit(1);
+
 	tst_res(TPASS, "can't corrupt nested NMI state after %ld iterations",
 		total_iter);
 }
-- 
2.46.0


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