linux-kernel - Re: [PATCH ima-evm-utils] Add tests for MMAP_CHECK and MMAP_CHECK

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Message-ID: <36d25da9b9b6aa004311e083a67bc44f3edcf05c.camel@huaweicloud.com>
Date:   Fri, 27 Jan 2023 08:57:17 +0100
From:   Roberto Sassu <roberto.sassu@...weicloud.com>
To:     Stefan Berger <stefanb@...ux.ibm.com>, zohar@...ux.ibm.com,
        dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH ima-evm-utils] Add tests for MMAP_CHECK and
 MMAP_CHECK_REQPROT hooks

On Thu, 2023-01-26 at 17:25 -0500, Stefan Berger wrote:
> 
> On 1/26/23 11:38, Roberto Sassu wrote:
> > From: Roberto Sassu <roberto.sassu@...wei.com>
> > 
> > Add tests to ensure that, after applying the kernel patch 'ima: Align
> > ima_file_mmap() parameters with mmap_file LSM hook', the MMAP_CHECK hook
> > checks the protections applied by the kernel and not those requested by the
> > application.
> > 
> > Also ensure that after applying 'ima: Introduce MMAP_CHECK_REQPROT hook',
> > the MMAP_CHECK_REQPROT hook checks the protections requested by the
> > application.
> 
> below LGTM
> 
> How do you tell the user that the patches need to be applied for the test to
> succeed and not worry about it when the patches are not applied?

Uhm, I agree. I should at least write a comment as for EVM portable
signatures, and maybe display a message in the test logs.

> > Test both with the test_mmap application that by default requests the
> > PROT_READ protection flag. Its syntax is:
> > 
> > +
> > +check_mmap() {
> > +	local hook="$1"
> > +	local arg="$2"
> > +	local test_file
> > +	local fowner
> > +	local rule
> > +	local result
> > +	local test_file_entry
> > +
> 
> you can write them all in one line: 'local test_file fowner rule result test_file_entry'

Ok.

Thanks

Roberto