linux-kernel - Re: [PATCH] arm: don't allow CONFIG_DEBUG_SET_MODULE_RONX if CONFIG_JUMP

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Date:	Thu, 3 Apr 2014 17:52:55 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Rabin Vincent <rabin@....in>
Cc:	Laura Abbott <lauraa@...eaurora.org>,
	Alexander Holler <holler@...oftware.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH] arm: don't allow CONFIG_DEBUG_SET_MODULE_RONX if
 CONFIG_JUMP_LABEL is enabled

On Thu, Apr 3, 2014 at 4:48 PM, Rabin Vincent <rabin@....in> wrote:
> On Thu, Apr 03, 2014 at 04:14:54PM -0700, Kees Cook wrote:
>> On Tue, Apr 1, 2014 at 4:08 PM, Rabin Vincent <rabin@....in> wrote:
>> > Here's a patch (probably whitespace damaged, hence also attached) with
>> > which dynamic ftrace works for me on top your other paches.  Tested on
>> > a non-LPAE SMP.
>>
>> Thanks! I'll incorporate calls to set_all_modules_text_rw/ro and see
>> what I can make work.
>
> You can use the patch I posted yesterday for module support:
> http://lists.infradead.org/pipermail/linux-arm-kernel/2014-April/244558.html

Yup, that's basically what I had too.

So, even with your patch, I still get faults with ftrace.
probe_kernel_write still errors for me, and I don't see why. I will
send an updated patch series with my current CONFIG_DEBUG_RODATA work
shortly...

-Kees

-- 
Kees Cook
Chrome OS Security
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