linux-kernel - Re: [PATCH v2] x86/mm: warn on W+x mappings

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Message-ID: <20151003112701.GA4531@gmail.com>
Date:	Sat, 3 Oct 2015 13:27:01 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, keescook@...omium.org
Subject: Re: [PATCH v2] x86/mm: warn on W+x mappings


* Stephen Smalley <sds@...ho.nsa.gov> wrote:

> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 30564e2..f8b1573 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -1150,6 +1150,8 @@ void mark_rodata_ro(void)
>  	free_init_pages("unused kernel",
>  			(unsigned long) __va(__pa_symbol(rodata_end)),
>  			(unsigned long) __va(__pa_symbol(_sdata)));
> +
> +	debug_checkwx();

Any reason to not do this on NX capable 32-bit kernels as well?

Thanks,

	Ingo
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