3.18-stable review patch. If anyone has any objections, please let me know.
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From: Eric W. Biederman ebiederm@xmission.com
commit 36476beac4f8ca9dc7722790b2e8ef0e8e51034e upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- kernel/user_namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -643,7 +643,7 @@ static ssize_t map_write(struct file *fi 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;