reserve_user_space(): mutual exclusion on mmap

2017-01-24 12:38:59 +09:00
parent 1bc3218fc1
commit ad214c8206
3 changed files with 6 additions and 0 deletions
--- a/executer/kernel/mcctrl/arch/x86_64/archdeps.c
+++ b/executer/kernel/mcctrl/arch/x86_64/archdeps.c
@@ -64,6 +64,8 @@ reserve_user_space(struct mcctrl_usrdata *usrdata, unsigned long *startp, unsign
 	unsigned long start = 0L;
 	unsigned long end;

+	mutex_lock(&usrdata->reserve_lock);
+
 #define	DESIRED_USER_END	0x800000000000
 #define	GAP_FOR_MCEXEC		0x008000000000UL
 	end = DESIRED_USER_END;
@@ -81,6 +83,8 @@ reserve_user_space(struct mcctrl_usrdata *usrdata, unsigned long *startp, unsign
 	up_write(&current->mm->mmap_sem);
 #endif

+	mutex_unlock(&usrdata->reserve_lock);
+
 	if (IS_ERR_VALUE(start)) {
 		return start;
 	}