add supercall to get kernelpatch build times

kernel/patch/common/sucompat.c

@@ -54,6 +54,10 @@ static const char *current_su_path = 0;
 static struct list_head allow_uid_list;
 static spinlock_t list_lock;
 
+const char* get_compile_timestamp() {
+    return __DATE__ " " __TIME__;
+}
+
 static void allow_reclaim_callback(struct rcu_head *rcu)
 {
     struct allow_uid *allow = container_of(rcu, struct allow_uid, rcu);
@@ -257,6 +261,13 @@ const char *su_get_path()
 }
 KP_EXPORT_SYMBOL(su_get_path);
 
+const char *su_get_ts()
+{
+    const char* timestamp = get_compile_timestamp();
+    return timestamp;
+}
+KP_EXPORT_SYMBOL(su_get_ts);
+
 // #define TRY_DIRECT_MODIFY_USER
 
 #define INLINE_HOOK_SYSCALL
@@ -267,7 +278,6 @@ static void handle_before_execve(hook_local_t *hook_local, char **__user u_filen
     // copy to user len
     hook_local->data0 = 0;
 #endif
-
     char __user *ufilename = *u_filename_p;
     char filename[SU_PATH_MAX_LEN];
     int flen = compat_strncpy_from_user(filename, ufilename, sizeof(filename));
@@ -556,4 +566,4 @@ int su_compat_init()
     // log_boot("hook 32 __NR_faccessat2 rc: %d\n", rc);
 
     return 0;
-}
+}

kernel/patch/common/supercall.c

@@ -227,6 +227,14 @@ static long call_su_get_path(char *__user ubuf, int buf_len)
     return compat_copy_to_user(ubuf, path, len + 1);
 }
 
+static long call_su_get_ts(char *__user ubuf, int buf_len)
+{
+    const char *path = su_get_ts();
+    int len = strlen(path);
+    if (buf_len <= len) return -ENOBUFS;
+    return compat_copy_to_user(ubuf, path, len + 1);
+}
+
 static long call_su_get_allow_sctx(char *__user usctx, int ulen)
 {
     int len = strlen(all_allow_sctx);

kernel/patch/include/accctl.h

@@ -31,7 +31,7 @@ int su_allow_uids(int is_user, uid_t *out_uids, int out_num);
 int su_allow_uid_profile(int is_user, uid_t uid, struct su_profile *profile);
 int su_reset_path(const char *path);
 const char *su_get_path();
-
+const char *su_get_ts();
 /**
  * @brief Whether to make the current task bypass all selinux permission checks.
  * 
@@ -45,4 +45,4 @@ static inline void set_priv_sel_allow(struct task_struct *task, bool val)
     dsb(ish);
 }
 
-#endif
+#endif

kernel/patch/include/uapi/scdefs.h

@@ -106,6 +106,7 @@ struct su_profile
 #define SUPERCALL_SU_GET_PATH 0x1110
 #define SUPERCALL_SU_RESET_PATH 0x1111
 #define SUPERCALL_SU_GET_SAFEMODE 0x1112
+#define SUPERCALL_SU_GET_TS 0x1113
 
 #define SUPERCALL_MAX 0x1200