From: viro@parcelfarce.linux.theplanet.co.uk
To: Willy TARREAU <willy@w.ods.org>
Cc: marcelo@conectiva.com.br, linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH-2.4] Prevent mounting on ".."
Date: Sun, 29 Jun 2003 15:11:03 +0100 [thread overview]
Message-ID: <20030629141102.GE27348@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <20030629130952.GA246@pcw.home.local>
On Sun, Jun 29, 2003 at 03:09:52PM +0200, Willy TARREAU wrote:
> chroot("/var/empty") (read-only directory or file-system)
> chdir("/")
> listen(), accept(), fork(), whatever...
> -> external code injection from a cracker :
> mount("none", "..", "ramfs")
> mkdir("../mydir")
> chdir("../mydir")
> the cracker now installs whatever he wants here.
That's a BS. Same effect would be achieved by replacing ".." with ".".
Or mounting on any existing subdirectory.
If attacker can mount of chroot - you've LOST. Already. End of story.
next prev parent reply other threads:[~2003-06-29 13:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-29 13:09 Willy TARREAU
2003-06-29 14:09 ` Arjan van de Ven
2003-06-29 14:24 ` Willy TARREAU
2003-06-29 14:11 ` viro [this message]
2003-06-29 14:20 ` Willy TARREAU
2003-06-29 14:27 ` viro
2003-06-29 14:35 ` Willy TARREAU
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20030629141102.GE27348@parcelfarce.linux.theplanet.co.uk \
--to=viro@parcelfarce.linux.theplanet.co.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=marcelo@conectiva.com.br \
--cc=willy@w.ods.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®