linux-kernel - Re: [PATCH] kernel/module.c: Mark module state before set RO and NX regions

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Date:	Thu, 8 Jan 2015 12:03:47 +0900
From:	Jungseung Lee <js07.lee@...il.com>
To:	Laura Abbott <lauraa@...eaurora.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] kernel/module.c: Mark module state before set RO and NX regions

2015-01-08 2:55 GMT+09:00 Laura Abbott <lauraa@...eaurora.org>:
> On 1/6/2015 8:16 PM, Rusty Russell wrote:
>>
>> Jungseung Lee <js07.lee@...il.com> writes:
>>>
>>> In some architectures like arm/arm64, set_memory_*() check module address
>>> and state as well. Mark module state before set RO and NX regions for
>>> the routine is passed.
>>>
>>> It will fix wrong RO/NX protection for loadable kernel modules on
>>> arm/arm64.
>>
>>
>> This partially reverts commit 4982223e51e8ea9d09bb33c8323b5ec1877b2b51
>> Author: Rusty Russell <rusty@...tcorp.com.au>
>> Date:   Wed May 14 10:54:19 2014 +0930
>>
>>      module: set nx before marking module MODULE_STATE_COMING.
>>
>> Laura Abbott (CC'd) was looking at an alternative fix for this.  Laura?
>>
>> Thanks,
>> Rusty.
>>
>
> Yes, my proposal was to stop using is_module_address and just bounds
> check against the module ranges[1]. I got bogged down with other
> tasks and hadn't submitted a patch for review yet.
>
I got it. I'll prepare bounds check patch for aarch32.
Thanks,

> Thanks,
> Laura
>
> [1]
> http://lists.infradead.org/pipermail/linux-arm-kernel/2014-December/311574.html
>
>
> --
> Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
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