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From: Chris Wright <chrisw@osdl.org>
To: "Peter Wächtler" <pwaechtler@mac.com>
Cc: Andrew Morton <akpm@osdl.org>,
	linux-kernel@vger.kernel.org, torvalds@osdl.org
Subject: Re: [PATCH] coredump - as root not only if euid switched
Date: Thu, 22 Apr 2004 12:53:17 -0700	[thread overview]
Message-ID: <20040422125317.Q22989@build.pdx.osdl.net> (raw)
In-Reply-To: <1082663036.2592.1.camel@picklock.adams.family>; from pwaechtler@mac.com on Thu, Apr 22, 2004 at 09:43:57PM +0200

* Peter Wächtler (pwaechtler@mac.com) wrote:
> Am Do, 2004-04-22 um 11.56 schrieb Andrew Morton:
> > Peter Waechtler <pwaechtler@mac.com> wrote:
> > >
> > >  >(why are you trying to unlink the old file anyway?)
> > >  >
> > > 
> > >  For security measure :O
> > >  I tried on solaris: touch the core file as user, open it and wait, dump core
> > >  as root -> nope, couldn't read the damn core - it was unlinked and created!
> > 
> > hm, OK.  There's a window in which someone can come in and recreate the
> > file, but the open is using O_EXCL|O_CREATE so that seems safe enough.
> 
> So here is the updated patch with an open coded call to sys_unlink

This patch breaks various ptrace() checks.

thanks,
-chris
-- 
Linux Security Modules     http://lsm.immunix.org     http://lsm.bkbits.net

  reply	other threads:[~2004-04-22 19:58 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-04-22  9:40 Peter Waechtler
2004-04-22  9:56 ` Andrew Morton
2004-04-22 19:43   ` Peter Wächtler
2004-04-22 19:53     ` Chris Wright [this message]
2004-04-22 20:05     ` Linus Torvalds
  -- strict thread matches above, loose matches on Subject: below --
2004-04-23 15:35 Albert Cahalan
2004-04-23 19:14 ` Peter Wächtler
2004-04-23 17:22   ` Albert Cahalan
2004-04-23  7:46 Peter Waechtler
2004-04-23  7:16 Peter Waechtler
2004-04-23 17:10 ` Chris Wright
2004-04-23 19:05   ` Peter Wächtler
2004-04-23  7:14 Peter Waechtler
2004-04-22  8:51 Peter Waechtler
2004-04-22  8:55 ` Andrew Morton
2004-04-21 19:20 Peter Wächtler
2004-04-22  1:18 ` Andrew Morton

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