From: Eric Paris <eparis@redhat.com>
To: Stephen Smalley <sds@tycho.nsa.gov>
Cc: selinux@tycho.nsa.gov, jmorris@namei.org
Subject: Re: [PATCH 2/2] selinux: implement mmap on /selinux/policy
Date: Tue, 27 Jul 2010 12:50:31 -0400 [thread overview]
Message-ID: <1280249431.23427.126.camel@localhost> (raw)
In-Reply-To: <1280249271.4789.61.camel@moss-pluto.epoch.ncsc.mil>
On Tue, 2010-07-27 at 12:47 -0400, Stephen Smalley wrote:
> On Mon, 2010-07-26 at 15:34 -0400, Eric Paris wrote:
> > /selinux/policy allows a user to copy the policy back out of the kernel.
> > This patch allows userspace to actually mmap that file and use it directly.
>
> # checkpolicy -b /selinux/policy
> checkpolicy: loading policy configuration from /selinux/policy
> Can't map '/selinux/policy': Invalid argument
>
> # strace checkpolicy -b /selinux/policy
> ...
> open("/selinux/policy", O_RDONLY) = 3
> fstat(3, {st_mode=S_IFREG|0400, st_size=5720516, ...}) = 0
> mmap(NULL, 5720516, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = -1 EINVAL
> (Invalid argument)
MAP_SHARED works. I didn't realize checkpolicy used mmap. I'll look at
it.
-Eric
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next prev parent reply other threads:[~2010-07-27 16:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-26 19:34 [PATCH 1/2] SELinux: allow userspace to read policy back out of the kernel Eric Paris
2010-07-26 19:34 ` [PATCH 2/2] selinux: implement mmap on /selinux/policy Eric Paris
2010-07-27 16:47 ` Stephen Smalley
2010-07-27 16:50 ` Eric Paris [this message]
2010-07-27 18:36 ` Stephen Smalley
2010-07-27 18:51 ` Eric Paris
2010-07-27 19:09 ` Stephen Smalley
2010-07-27 19:16 ` Eric Paris
2010-07-27 19:20 ` Stephen Smalley
2010-07-27 19:24 ` Eric Paris
2010-07-27 19:28 ` Stephen Smalley
2010-07-27 20:24 ` Eric Paris
2010-07-29 12:50 ` Stephen Smalley
2010-07-29 17:58 ` Eric Paris
2010-07-26 20:48 ` [PATCH 1/2] SELinux: allow userspace to read policy back out of the kernel Stephen Smalley
2010-07-27 18:11 ` Eric Paris
2010-07-27 18:39 ` Stephen Smalley
2010-10-13 13:20 ` Eric Paris
2010-10-13 14:17 ` Eric Paris
2010-10-13 19:15 ` Eric Paris
2010-07-27 18:31 ` Stephen Smalley
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