linux-kernel - Re: [PATCH v2 22/35] vfs: don't open real

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Date:   Tue, 15 May 2018 16:42:10 -0400
From:   Vivek Goyal <vgoyal@...hat.com>
To:     Miklos Szeredi <mszeredi@...hat.com>,
        Daniel J Walsh <dwalsh@...hat.com>
Cc:     linux-unionfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        linux-security-module@...r.kernel.org,
        Paul Moore <pmoore@...hat.com>,
        Stephen Smalley <sds@...ho.nsa.gov>
Subject: Re: [PATCH v2 22/35] vfs: don't open real

On Mon, May 14, 2018 at 09:58:03AM -0400, Vivek Goyal wrote:

[..]
> Talked to Dan and he mentioned that he was trying to test entrypoint
> failure (and not exec failure) and that's whey he might have allowed exec
> to mounter.
> 
> I think that current entrypoint test's expectations are wrong.
> User process sees overlay inode lablel which is rwx_t and that means
> overlay layer will allow entrypoint into that executable. This will be the
> behavior on a normal file system where underlying file's label will be
> completely overridden by context=.
> 
> So in my opinion, we should modify testsuite and not run this test with
> context= mounts.

Miklos, now a fix has been merged to the tests so that test passes both with
current kernels and proposed changes.

https://github.com/SELinuxProject/selinux-testsuite/pull/36

Thanks Dan Walsh, Stephen Smalley and Paul More.

Vivek