ANDROID: syscall_check: add vendor hook for mmap syscall

Through this vendor hook, we can get the timing to check
current running task for the validation of its credential
and related operations.

Bug: 191291287

Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Change-Id: If20bd8bb8311ad10a374033734fbdc7ef61a7704

include/trace/hooks/syscall_check.h

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM syscall_check
+
+#define TRACE_INCLUDE_PATH trace/hooks
+#if !defined(_TRACE_HOOK_SYSCALL_CHECK_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HOOK_SYSCALL_CHECK_H
+#include <linux/tracepoint.h>
+#include <trace/hooks/vendor_hooks.h>
+/*
+ * Following tracepoints are not exported in tracefs and provide a
+ * mechanism for vendor modules to hook and extend functionality
+ */
+struct file;
+DECLARE_HOOK(android_vh_check_mmap_file,
+	TP_PROTO(const struct file *file, unsigned long prot,
+		unsigned long flag, unsigned long ret),
+	TP_ARGS(file, prot, flag, ret));
+
+#endif /* _TRACE_HOOK_SYSCALL_CHECK_H */
+/* This part must be outside protection */
+#include <trace/define_trace.h>