kernel: Replace ksu_access_ok with macro

Signed-off-by: rsuntk <rissu.ntk@gmail.com>

kernel/kernel_compat.c

@@ -178,12 +178,3 @@ long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
 	return ret;
 }
 #endif
-
-int ksu_access_ok(const void *addr, unsigned long size)
-{
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
-	return access_ok(addr, size);
-#else
-	return access_ok(VERIFY_READ, addr, size);
-#endif
-}

kernel/kernel_compat.h

@@ -45,5 +45,11 @@ extern ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
 				      loff_t *pos);
 extern ssize_t ksu_kernel_write_compat(struct file *p, const void *buf,
 				       size_t count, loff_t *pos);
-extern int ksu_access_ok(const void *addr, unsigned long size);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+#define ksu_access_ok(addr, size)	(access_ok(addr, size))
+#else
+#define ksu_access_ok(addr, size)	(access_ok(VERIFY_READ, addr, size))
+#endif
+
 #endif

kernel/sucompat.c

@@ -155,7 +155,7 @@ int ksu_handle_execve_sucompat(int *fd, const char __user **filename_user,
 	 * some cpus dont really have that good speculative execution
 	 * access_ok to substitute set_fs, we check if pointer is accessible
 	 */
-	if (!ksu_access_ok((const void *)filename_user, sizeof(path)))
+	if (!ksu_access_ok(*filename_user, sizeof(path)))
 		return 0;
 
 	// success = returns number of bytes and should be less than path