1 files changed, 107 insertions, 0 deletions
diff --git a/kernel/tests/lib/tst_taint.c b/kernel/tests/lib/tst_taint.c
new file mode 100644
index 0000000..49146aa
--- /dev/null
+++ b/kernel/tests/lib/tst_taint.c
@@ -0,0 +1,107 @@
+#define TST_NO_DEFAULT_MAIN
+
+#include "tst_test.h"
+#include "tst_taint.h"
+#include "tst_safe_stdio.h"
+
+#define TAINT_FILE "/proc/sys/kernel/tainted"
+
+static unsigned int taint_mask = -1;
+
+static unsigned int tst_taint_read(void)
+{
+	unsigned int val;
+
+	SAFE_FILE_SCANF(TAINT_FILE, "%u", &val);
+
+	return val;
+}
+
+static int tst_taint_check_kver(unsigned int mask)
+{
+	int r1;
+	int r2;
+	int r3 = 0;
+
+	if (mask & TST_TAINT_X) {
+		r1 = 4;
+		r2 = 15;
+	} else if (mask & TST_TAINT_K) {
+		r1 = 4;
+		r2 = 0;
+	} else if (mask & TST_TAINT_L) {
+		r1 = 3;
+		r2 = 17;
+	} else if (mask & TST_TAINT_E) {
+		r1 = 3;
+		r2 = 15;
+	} else if (mask & TST_TAINT_O) {
+		r1 = 3;
+		r2 = 2;
+	} else if (mask & TST_TAINT_I) {
+		r1 = 2;
+		r2 = 6;
+		r3 = 35;
+	} else if (mask & TST_TAINT_C) {
+		r1 = 2;
+		r2 = 6;
+		r3 = 28;
+	} else if (mask & TST_TAINT_W) {
+		r1 = 2;
+		r2 = 6;
+		r3 = 26;
+	} else if (mask & TST_TAINT_A) {
+		r1 = 2;
+		r2 = 6;
+		r3 = 25;
+	} else if (mask & TST_TAINT_D) {
+		r1 = 2;
+		r2 = 6;
+		r3 = 23;
+	} else if (mask & TST_TAINT_U) {
+		r1 = 2;
+		r2 = 6;
+		r3 = 21;
+	} else {
+		r1 = 2;
+		r2 = 6;
+		r3 = 16;
+	}
+
+	return tst_kvercmp(r1, r2, r3);
+}
+
+void tst_taint_init(unsigned int mask)
+{
+	unsigned int taint = -1;
+
+	if (mask == 0)
+		tst_brk(TBROK, "mask is not allowed to be 0");
+
+	if (tst_taint_check_kver(mask) < 0)
+		tst_res(TCONF, "Kernel is too old for requested mask");
+
+	taint_mask = mask;
+	taint = tst_taint_read();
+
+	if (taint & TST_TAINT_W) {
+		tst_res(TCONF, "Ignoring already set kernel warning taint");
+		taint_mask &= ~TST_TAINT_W;
+	}
+
+	if ((taint & taint_mask) != 0)
+		tst_brk(TBROK, "Kernel is already tainted: %u", taint);
+}
+
+
+unsigned int tst_taint_check(void)
+{
+	unsigned int taint = -1;
+
+	if (taint_mask == (unsigned int) -1)
+		tst_brk(TBROK, "need to call tst_taint_init() first");
+
+	taint = tst_taint_read();
+
+	return (taint & taint_mask);
+}