linux-kernel - Re: [PATCH] vfs: fix IMA lockdep circular locking dependency

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Date:	Wed, 16 May 2012 10:13:37 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: [PATCH] vfs: fix IMA lockdep circular locking dependency

On Tue, May 15, 2012 at 8:37 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:

> It does change some things, like say that "->mmap_file()" is only ever
> called for actual files, not for anonymous mappings. It doesn't seem
> to be sensible to have a security model for anonymous mappings -
> there's nothing there to really target. Whatever.

So we would have no checks for anonymous mappings?  We actually do
have some controls around them today

http://www.akkadia.org/drepper/selinux-mem.html

It's mostly around W+X memory.  (or was W now X memory)

Admittedly with the growing prevalence of JiT stuff we are using those
protections less and less and less....

Not certain how happy some will be to see them completely disappear....
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