Commit 36476bea authored Dec 05, 2014 by Eric W. Biederman

userns; Correct the comment in map_write



It is important that all maps are less than PAGE_SIZE
or else setting the last byte of the buffer to '0'
could write off the end of the allocated storage.

Correct the misleading comment.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

parent 66d2f338

kernel/user_namespace.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -643,7 +643,7 @@ static ssize_t map_write(struct file file, const char __user buf,
		if (!page)
		goto out;

		/* Only allow <= page size writes at the beginning of the file */
		/* Only allow < page size writes at the beginning of the file */
		ret = -EINVAL;
		if ((*ppos != 0) \|\| (count >= PAGE_SIZE))
		goto out;