linux-kernel - Re: [PATCH v2] vfs: Tighten up linkat(..., AT_EMPTY

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Message-ID: <CA+55aFzR71kJOOVzHKKaXW2Ph7wb6ivtVHPeR49PPcqpiCfPsA@mail.gmail.com>
Date:	Thu, 22 Aug 2013 13:44:05 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Willy Tarreau <w@....eu>,
	"security@...nel.org" <security@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Brad Spengler <spender@...ecurity.net>
Subject: Re: [PATCH v2] vfs: Tighten up linkat(..., AT_EMPTY_PATH)

On Thu, Aug 22, 2013 at 1:22 PM, Andy Lutomirski <luto@...capital.net> wrote:
>
> Let me rephrase that: why do we allow these types of lookup to recurse
> like normal symlinks?  I'm proposing that these links immediately
> terminate lookup  [..]

It can nest *inside* a regular symlink. So there should not be any
recursion of pure /proc style symlink jumps, but they live within the
nesting that is normal symlink behavior.

            Linus
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