linux-kernel - Re: [PATCH 3/7] SLIM main patch

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Date:	Thu, 24 Aug 2006 16:41:34 -0400
From:	Mimi Zohar <zohar@...ibm.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Benjamin LaHaise <bcrl@...ck.org>,
	David Safford <safford@...ibm.com>, kjhall@...ibm.com,
	linux-kernel <linux-kernel@...r.kernel.org>,
	LSM ML <linux-security-module@...r.kernel.org>,
	Serge E Hallyn <sergeh@...ibm.com>
Subject: Re: [PATCH 3/7] SLIM main patch


Alan Cox <alan@...rguk.ukuu.org.uk> wrote on 08/24/2006 10:15:17 AM:

> Ar Iau, 2006-08-24 am 08:32 -0500, ysgrifennodd Serge E. Hallyn:
> > > You also have to deal with existing mmap() mappings and
> > > outstanding I/O.
> >
> > That she does.
>
> I don't believe so from the patches.
>
> > >    SysV shared memory
> >
> > standard mmap controls should handle this, right?
>
> No its rather independant of mmap

Under the covers it seems to use shmem.  sys_shmget() calls newseg(),
which sets up the shared memory.

> > >    mmap
> >
> > She handles these.
>
> I must have missed where it handles that.

revoke_mmap_wperm() walks current->mm->mmap and removes
the file write permission using do_mprotect().

We have test shmem and mmap programs in the ltp framework that
show this actually works.

Mimi

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