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Date:	Mon, 30 Jun 2014 07:49:41 -0700
From:	Andy Lutomirski <>
To:	David Drysdale <>
Cc:	Al Viro <>,
	LSM List <>,
	Greg Kroah-Hartman <>,
	James Morris <>,
	Kees Cook <>,
	Linux API <>,
	Meredydd Luff <>,
	"" <>
Subject: Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)

On Jun 30, 2014 3:36 AM, "David Drysdale" <> wrote:
> Add a new O_BENEATH_ONLY flag for openat(2) which restricts the
> provided path, rejecting (with -EACCES) paths that are not beneath
> the provided dfd.  In particular, reject:
>  - paths that contain .. components
>  - paths that begin with /
>  - symlinks that have paths as above.

I like this a lot.  However, I think I'd like it even better if it
were AT_BENEATH_ONLY so that it could be added to the rest of the *at

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