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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
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