fix: change default permission of procfs to 0550

close: #I4NY49
Signed-off-by: NLeon Chan <chenwei26@huawei.com>

fs/proc/include/proc_fs.h

@@ -54,7 +54,7 @@ typedef unsigned short fmode_t;
 #define PROC_ERROR (-1)
 
 /* Default file mode for procfs */
-#define PROCFS_DEFAULT_MODE 0555
+#define PROCFS_DEFAULT_MODE 0550
 
 /* 64bit hashes as llseek() offset (for directories) */
 #define FMODE_64BITHASH   ((fmode_t)0x400)