linux-kernel - Re: [PATCH ima-evm-utils v4] Add tests for MMAP_CHECK and MMAP_CHECK

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Date:   Thu, 02 Feb 2023 15:40:06 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.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, stefanb@...ux.ibm.com,
        viro@...iv.linux.org.uk, pvorel@...e.cz,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH ima-evm-utils v4] Add tests for MMAP_CHECK and
 MMAP_CHECK_REQPROT hooks

On Thu, 2023-02-02 at 17:23 +0100, Roberto Sassu wrote:
> > > +   if (ptr == MAP_FAILED) {
> > > +           ret = ERR_SETUP;
> > > +           if (argv[2] && !strcmp(argv[2], "exec_on_writable") &&
> > > +               errno == EACCES)
> > > +                   ret = ERR_TEST;
> > > +
> > 
> > FYI, on an older distro kernel, the mmap fails and results in following
> > without any explanation.
> > 
> > Test: check_mmap (hook="MMAP_CHECK", test_mmap arg: "exec")
> > Unexpected exit status 1 from test_mmap
> > 
> > With some additional debugging, I'm seeing:
> > Failed mmap() /tmp/tmp.4gD2UjSvC4/tmp.PlzUEm09hO, err: -13 (Permission
> > denied)b
> 
> Uhm, ok. Which kernel is failing?

I'm able to reproduce the error on a next-integrity or next-integrity-
testing kernel, by running the tests multiple times.  The error doesn't
occur the first time running the test, but subsequent times.

Mimi