1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/gpu/arm/t6xx/kbase/src/common/mali_kbase_security.c b/drivers/gpu/arm/t6xx/kbase/src/common/mali_kbase_security.c
new file mode 100755
index 00000000000..687e7921227
--- /dev/null
+++ b/drivers/gpu/arm/t6xx/kbase/src/common/mali_kbase_security.c
@@ -0,0 +1,76 @@
+/*
+ *
+ * (C) COPYRIGHT 2011-2013 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * A copy of the licence is included with the program, and can also be obtained
+ * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ */
+
+
+
+/**
+ * @file mali_kbase_security.c
+ * Base kernel security capability API
+ */
+
+#include <kbase/src/common/mali_kbase.h>
+
+static inline mali_bool kbasep_am_i_root(void)
+{
+#if KBASE_HWCNT_DUMP_BYPASS_ROOT
+	return MALI_TRUE;
+#else
+	/* Check if root */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
+	if (uid_eq(current_euid(), GLOBAL_ROOT_UID))
+		return MALI_TRUE;
+#else
+	if (current_euid() == 0)
+		return MALI_TRUE;
+#endif /*LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)*/
+	return MALI_FALSE;
+#endif /*KBASE_HWCNT_DUMP_BYPASS_ROOT*/
+}
+
+/**
+ * kbase_security_has_capability - see mali_kbase_caps.h for description.
+ */
+
+mali_bool kbase_security_has_capability(kbase_context *kctx, kbase_security_capability cap, u32 flags)
+{
+	/* Assume failure */
+	mali_bool access_allowed = MALI_FALSE;
+	mali_bool audit = (KBASE_SEC_FLAG_AUDIT & flags) ? MALI_TRUE : MALI_FALSE;
+
+	KBASE_DEBUG_ASSERT(NULL != kctx);
+	CSTD_UNUSED(kctx);
+
+	/* Detect unsupported flags */
+	KBASE_DEBUG_ASSERT(((~KBASE_SEC_FLAG_MASK) & flags) == 0);
+
+	/* Determine if access is allowed for the given cap */
+	switch (cap) {
+	case KBASE_SEC_MODIFY_PRIORITY:
+	case KBASE_SEC_INSTR_HW_COUNTERS_COLLECT:
+		/* Access is granted only if the caller is privileged */
+		access_allowed = kbasep_am_i_root();
+		break;
+	}
+
+	/* Report problem if requested */
+	if (MALI_FALSE == access_allowed) {
+		if (MALI_FALSE != audit)
+			KBASE_DEBUG_PRINT_WARN(KBASE_CORE, "Security capability failure: %d, %p", cap, (void *)kctx);
+	}
+
+	return access_allowed;
+}
+
+KBASE_EXPORT_TEST_API(kbase_security_has_capability)