From: Al Viro <viro@ZenIV.linux.org.uk>
To: David Drysdale <drysdale@google.com>
Cc: linux-kernel@vger.kernel.org, Kees Cook <keescook@chromium.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Meredydd Luff <meredydd@senatehouse.org>,
Will Drewry <wad@chromium.org>,
Jorge Lucangeli Obes <jorgelo@google.com>,
Ricky Zhou <rickyz@google.com>, Lee Campbell <leecam@google.com>,
Julien Tinnes <jln@google.com>,
Mike Depinet <mdepinet@google.com>,
James Morris <james.l.morris@oracle.com>,
Andy Lutomirski <luto@amacapital.net>,
Paolo Bonzini <pbonzini@redhat.com>,
Paul Moore <paul@paul-moore.com>,
Christoph Hellwig <hch@infradead.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
linux-api@vger.kernel.org, linux-security-module@vger.kernel.org
Subject: Re: [PATCH 1/3] fs: add O_BENEATH flag to openat(2)
Date: Mon, 3 Nov 2014 15:20:36 +0000 [thread overview]
Message-ID: <20141103152036.GA7996@ZenIV.linux.org.uk> (raw)
In-Reply-To: <1415015305-15494-2-git-send-email-drysdale@google.com>
On Mon, Nov 03, 2014 at 11:48:23AM +0000, David Drysdale wrote:
> Add a new O_BENEATH 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.
Yecch... The degree of usefulness aside (and I'm not convinced that it
is non-zero), WTF pass one bit out of nameidata->flags in a separate argument?
Through the mutual recursion, no less... And then you are not even attempting
to detect symlinks that are not followed by interpretation of _any_ pathname.
next prev parent reply other threads:[~2014-11-03 15:20 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-03 11:48 [PATCH 0/3] fs: add O_BENEATH flag to openat(2) David Drysdale
[not found] ` <1415015305-15494-1-git-send-email-drysdale-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2014-11-03 11:48 ` [PATCH 1/3] " David Drysdale
2014-11-03 15:20 ` Al Viro [this message]
[not found] ` <20141103152036.GA7996-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2014-11-03 15:42 ` Andy Lutomirski
2014-11-03 17:22 ` Eric W.Biederman
2014-11-04 9:40 ` David Drysdale
2014-11-05 17:21 ` David Drysdale
[not found] ` <CAHse=S8ZmYLkOb9hmOMPkvHabqXH1sCUBTJWVO-++PMJXES=sg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-11-05 17:28 ` Andy Lutomirski
2014-11-03 17:37 ` David Drysdale
2014-11-03 18:26 ` Julien Tinnes
[not found] ` <CAKyRK=hRX1xk_0cRNhZ341HwU9Nim5_vhpM5twJHUOt8fH29=w@mail.gmail.com>
2014-11-03 18:29 ` Andy Lutomirski
2014-11-03 11:48 ` [PATCH 2/3] selftests: Add test of O_BENEATH & openat(2) David Drysdale
2014-11-03 11:48 ` [PATCH man-pages 3/3] open.2: describe O_BENEATH flag David Drysdale
2014-11-03 11:56 ` Paolo Bonzini
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