linux-kernel - Re: [RFC][PATCH 0/3] vfs: Detach mounts on unlink.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1381018920.1974.167@driftwood>
Date:	Sat, 05 Oct 2013 19:22:00 -0500
From:	Rob Landley <rob@...dley.net>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [RFC][PATCH 0/3] vfs: Detach mounts on unlink.

On 10/05/2013 06:24:51 PM, Al Viro wrote:
> On Sat, Oct 05, 2013 at 04:17:55PM -0700, Linus Torvalds wrote:
> > On Sat, Oct 5, 2013 at 4:07 PM, Rob Landley <rob@...dley.net> wrote:
> > >
> > > A todo item I've had _forever_ is fixing chroot() to not be  
> broken so that
> > > you can trivially break out of a chroot via:
> >
> > What drugs are you on?
> >
> > Your example is moronic, and against all _documented_ uses of  
> chroot.
> 
> ... and even fixing that example (chroot *can* be escaped, if you can
> call chroot(2) - mkdir /foo, chdir /, chroot /foo, chroot .. and you  
> are out)

Um, wasn't that my example?

> the whole thing is idiocy - chroot() is not and has never been  
> root-proof
> and anybody expecting it to be has failed to read any number of FAQs  
> out
> there.

Which is why I was proposing modifying it so lxc and containers didn't  
have to use pivot_root() instead, with all the logic to rehome existing  
processes and the weird "this path is relative the old root, this path  
is relative to the new root" syntax from initial ramdisks.

Rob--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/