linux-hardening - Re: [PATCH v4 1/2] powerpc/mm: Support execute-only memory on the Radix MMU

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Message-Id: <166195163958.45984.15308325694886524412.b4-ty@ellerman.id.au>
Date:   Wed, 31 Aug 2022 23:13:59 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     linuxppc-dev@...ts.ozlabs.org, Russell Currey <ruscur@...sell.cc>
Cc:     mpe@...erman.id.au, npiggin@...il.com, aneesh.kumar@...ux.ibm.com,
        linux-hardening@...r.kernel.org, christophe.leroy@...roup.eu,
        ajd@...ux.ibm.com, nicholas@...ux.ibm.com,
        anshuman.khandual@....com
Subject: Re: [PATCH v4 1/2] powerpc/mm: Support execute-only memory on the Radix MMU

On Wed, 17 Aug 2022 15:06:39 +1000, Russell Currey wrote:
> Add support for execute-only memory (XOM) for the Radix MMU by using an
> execute-only mapping, as opposed to the RX mapping used by powerpc's
> other MMUs.
> 
> The Hash MMU already supports XOM through the execute-only pkey,
> which is a separate mechanism shared with x86.  A PROT_EXEC-only mapping
> will map to RX, and then the pkey will be applied on top of it.
> 
> [...]

Applied to powerpc/next.

[1/2] powerpc/mm: Support execute-only memory on the Radix MMU
      https://git.kernel.org/powerpc/c/395cac7752b905318ae454a8b859d4c190485510
[2/2] selftests/powerpc: Add a test for execute-only memory
      https://git.kernel.org/powerpc/c/98acee3f8db451eaab9fbd422e523c228aacf08c

cheers