linux-kernel - Re: [patch] x86: test case for the RODATA config option

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Message-ID: <20080123000459.GB16576@elte.hu>
Date:	Wed, 23 Jan 2008 01:04:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] x86: test case for the RODATA config option


cool!

could you perhaps also do an add-on:

> +	/* test 1: read the value */
> +	/* test 2: write to the variable; this should fault */
> +	/* test 3: check the value hasn't changed */

           test 4: make it writable again
           test 5: make it NX -> check that it's not executable

and perhaps also check that normal kernel allocations (kmalloc(), etc.) are NX as well? (with the same section trick you use in 
this patch - perhaps try to call a kmalloc()-ed buffer that contains a 
'ret' instruction - if that call faults then the test is OK, if the call 
succeeds then the test failed.)

	Ingo
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