From beaa048be33df322a6132d3af50504ac132720ec Mon Sep 17 00:00:00 2001
From: weishu <twsxtd@gmail.com>
Date: Wed, 9 Aug 2023 12:33:05 +0800
Subject: [PATCH] kernel: don't trigger page fault when become manager. fix
 #836

---
 kernel/core_hook.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index 83413b47..8641a8ed 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -232,8 +232,10 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		// someone wants to be root manager, just check it!
 		// arg3 should be `/data/user/<userId>/<manager_package_name>`
 		char param[128];
-		if (copy_from_user(param, arg3, sizeof(param))) {
+		if (ksu_strncpy_from_user_nofault(param, arg3, sizeof(param))) {
+#ifdef CONFIG_KSU_DEBUG
 			pr_err("become_manager: copy param err\n");
+#endif
 			return 0;
 		}