linux-kernel - Re: [PATCH 2/5] Protectable Memory Allocator

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Date:   Tue, 6 Jun 2017 09:24:21 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Igor Stoppa <igor.stoppa@...wei.com>,
        Christoph Hellwig <hch@...radead.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     keescook@...omium.org, mhocko@...nel.org, jmorris@...ei.org,
        paul@...l-moore.com, sds@...ho.nsa.gov, casey@...aufler-ca.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH 2/5] Protectable Memory Allocator

On 06/06/2017 04:34 AM, Igor Stoppa wrote:
> On 06/06/17 09:25, Christoph Hellwig wrote:
>> On Tue, Jun 06, 2017 at 01:44:32PM +0900, Tetsuo Handa wrote:
> 
> [..]
> 
>>> As far as I know, not all CONFIG_MMU=y architectures provide
>>> set_memory_ro()/set_memory_rw(). You need to provide fallback for
>>> architectures which do not provide set_memory_ro()/set_memory_rw()
>>> or kernels built with CONFIG_MMU=n.
>>
>> I think we'll just need to generalize CONFIG_STRICT_MODULE_RWX and/or
>> ARCH_HAS_STRICT_MODULE_RWX so there is a symbol to key this off.
> 
> Would STRICT_KERNEL_RWX work? It's already present.
> If both kernel text and rodata can be protected, so can pmalloc data.
> 
> ---
> igor
> 
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> 


There's already ARCH_HAS_SET_MEMORY for this purpose.

Thanks,
Laura