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From: "H. Peter Anvin" <hpa@zytor.com>
To: Eric Paris <eparis@redhat.com>
Cc: Alan Cox <alan@redhat.com>, James Morris <jmorris@namei.org>,
	linux-kernel@vger.kernel.org, selinux@tycho.nsa.gov,
	drepper@redhat.com, roland@redhat.com, arjan@infradead.org,
	mingo@elte.hu, viro@zeniv.linux.org.uk, chrisw@redhat.com,
	sds@tycho.nsa.gov, sgrubb@redhat.com
Subject: Re: [PATCH] Protection for exploiting null dereference using mmap
Date: Tue, 05 Jun 2007 15:46:34 -0700	[thread overview]
Message-ID: <4665E7CA.8030907@zytor.com> (raw)
In-Reply-To: <1181078927.3978.42.camel@localhost.localdomain>

Eric Paris wrote:
> 
> While I understand, there are a few users who will have problems with
> this default are we really better to not provide this defense in depth
> for the majority of users and let those with problems turn it off rather
> than provide no defense by default?  I could even provide a different
> default for SELinux and non-SELinux if anyone saw value in that?  But if
> others think that off default is  best I'll send another patch shortly
> with the unsigned long fix and the default set to 0.  My hope is then
> that distros will figure out to turn this on.
> 

I hope not.  This breaks any hardware virtualizer.

So yes, we're better off not having this on, and require it to be
explicitly enabled by the end user.

Sorry.

	-hpa

  reply	other threads:[~2007-06-05 22:49 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-30 21:48 [PATCH] SELinux protection for exploiting null dereference using mmap Eric Paris
2007-05-31  0:07 ` James Morris
2007-05-31  5:46   ` Eric Paris
2007-05-31 13:45     ` James Morris
2007-05-31 14:45       ` Stephen Smalley
     [not found]         ` <465EE1C9.3020809@redhat.com>
2007-05-31 15:07           ` Stephen Smalley
2007-05-31 15:19         ` James Morris
2007-05-31 15:31           ` Stephen Smalley
2007-06-02  2:27     ` Chris Wright
2007-05-31  1:40 ` Chris Wright
     [not found] ` <20070603205653.GE25869@devserv.devel.redhat.com>
2007-06-04 13:38   ` Stephen Smalley
2007-06-05 20:34     ` [PATCH] Protection " Eric Paris
2007-06-05 20:34       ` Eric Paris
2007-06-05 21:00       ` James Morris
2007-06-05 21:00         ` James Morris
2007-06-05 21:16         ` Alan Cox
2007-06-05 21:28           ` Eric Paris
2007-06-05 21:28             ` Eric Paris
2007-06-05 22:46             ` H. Peter Anvin [this message]
2007-06-07 14:28               ` Pavel Machek
2007-06-06 12:47             ` Stephen Smalley
2007-06-06 12:47               ` Stephen Smalley
2007-06-07 16:58               ` Jan Engelhardt
2007-06-06  6:30           ` Eric Paris
2007-06-06  6:30             ` Eric Paris
2007-06-06 13:21             ` James Morris
2007-06-06 13:21               ` James Morris
2007-06-06 17:30             ` Stephen Smalley
2007-06-06 17:30               ` Stephen Smalley
2007-06-06 18:01               ` James Morris
2007-06-06 18:01                 ` James Morris
2007-06-06 18:06             ` Chris Wright
2007-06-06 18:06               ` Chris Wright
2007-06-20 19:48             ` Adam Jackson
2007-06-05 22:49       ` Chris Wright
2007-06-05 22:49         ` Chris Wright
2007-06-05 22:53       ` Chris Wright
2007-06-05 22:53         ` Chris Wright
2007-06-06 12:12         ` Stephen Smalley
2007-06-06 12:12           ` Stephen Smalley
2007-06-06  9:01       ` Russell Coker
2007-06-06  9:01         ` Russell Coker
2007-06-06 12:18         ` Stephen Smalley
2007-06-06 12:18           ` Stephen Smalley

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