From: Andreas Gruenbacher <agruen@suse.de>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: Andreas Dilger <adilger@sun.com>,
Valdis.Kletnieks@vt.edu, linux@treblig.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] vfs: new O_NODE open flag
Date: Wed, 14 Oct 2009 15:14:52 +0200 [thread overview]
Message-ID: <200910141514.52811.agruen@suse.de> (raw)
In-Reply-To: <E1MsIhu-0002AY-F2@pomaz-ex.szeredi.hu>
On Monday 28 September 2009 18:04:10 Miklos Szeredi wrote:
> The point of the above example was that reopening a file descriptor
> with upgraded (or downgraded) access mode is even now possible. Which
> either means:
>
> a) the current permission model under /proc/PID/fd has a security
> hole (which Jamie is worried about)
No worries -- access to /proc/PID/fd/* requires ptrace access to PID, so we do
not have a security hole here. The ptrace checks were introduced here:
778c1144771f0064b6f51bee865cceb0d996f2f9
df26c40e567356caeefe2861311e19c54444d917
Cheers,
Andreas
next prev parent reply other threads:[~2009-10-14 13:14 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-24 14:51 [PATCH] vfs: new O_NODE open flag Miklos Szeredi
2009-09-25 0:23 ` Andreas Gruenbacher
2009-09-25 5:52 ` Miklos Szeredi
2009-09-25 12:37 ` Dr. David Alan Gilbert
2009-09-25 12:18 ` Miklos Szeredi
2009-09-25 17:08 ` Jamie Lokier
2009-09-25 16:53 ` Andreas Dilger
2009-09-25 17:20 ` Valdis.Kletnieks
2009-09-25 18:35 ` Dr. David Alan Gilbert
2009-09-25 21:18 ` Valdis.Kletnieks
2009-09-28 10:25 ` Miklos Szeredi
2009-09-28 13:28 ` Jamie Lokier
2009-09-28 14:07 ` Miklos Szeredi
2009-09-28 14:10 ` Jamie Lokier
2009-09-30 8:18 ` Florian Weimer
2009-09-28 15:21 ` Andreas Dilger
2009-09-28 16:04 ` Miklos Szeredi
2009-10-04 19:03 ` Pavel Machek
2009-10-04 22:58 ` Jamie Lokier
2009-10-23 17:10 ` /proc filesystem allows bypassing directory permissions on Linux (was Re: [PATCH] vfs: new O_NODE open flag) Pavel Machek
2009-10-14 13:14 ` Andreas Gruenbacher [this message]
2009-09-25 19:02 ` [PATCH] vfs: new O_NODE open flag Andreas Dilger
2009-09-28 15:53 ` Jamie Lokier
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