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

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Date:	Wed, 30 May 2012 23:55:24 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Eric Paris <eparis@...isplace.org>,
	Mimi Zohar <zohar@...ibm.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfs: fix IMA lockdep circular locking dependency

On Thu, 2012-05-31 at 01:56 +0100, Al Viro wrote:
> On Wed, May 30, 2012 at 05:40:54PM -0700, Linus Torvalds wrote:
> > On Wed, May 30, 2012 at 5:28 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> > >
> > > FWIW, I think it's cleaner to take the whole thing into an inlined helper.
> > 
> > Even better.
> > 
> > I notice that your inlined helper doesn't do what I did: if PROT_EXEC
> > is already set, stop all the stupid games. IOW, the first test in that
> > function could as well be
> > 
> >     if (prot & (PROT_READ | PROT_EXEC) != PROT_READ)
> >         return prot;
> > 
> > because if PROT_EXEC is already set, or if PROT_READ wasn't set, none
> > of the rest of the checks make any sense at all.
> 
> Point...  OK, done, pushed and the whole thing thrown into #for-next.

Patch "split cap_mmap_addr() out of cap_file_mmap()" contains the typo
'cat_mmap_addr', which is then removed in
"split ->file_mmap() into ->mmap_addr()/->mmap_file()".

> Probably too late for today's linux-next, but tomorrow one should pick
> that.  BTW, tomorrow there'll be a signal.git pull request as well,
> with task_work_add() series in it.
> 
> Now for the Miklos' stuff...
> 


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