linux-kernel - Re: (subset) [PATCH v2 00/37] Implement execute-only protection on powerpc

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Message-Id: <169736402375.957740.6017054245951697068.b4-ty@ellerman.id.au>
Date:   Sun, 15 Oct 2023 21:00:23 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: (subset) [PATCH v2 00/37] Implement execute-only protection on powerpc

On Mon, 25 Sep 2023 20:31:14 +0200, Christophe Leroy wrote:
> This series reworks _PAGE_FLAGS on all platforms in order
> to implement execute-only protection on all powerpc.
> 
> For all targets except 40x and 604 it will be a real execute-only
> protection as the hardware and/or software allows a distinct protection.
> 
> For 40x and 604 that's a poor's man execute-only protection in the
> way that once the page is in the TLB it can be executed. But it's
> better than nothing and allows to have a similar implementation for
> all sorts of powerpc.
> 
> [...]

Patches 1 and 2 applied to powerpc/fixes.

[01/37] powerpc/8xx: Fix pte_access_permitted() for PAGE_NONE
        https://git.kernel.org/powerpc/c/5d9cea8a552ee122e21fbd5a3c5d4eb85f648e06
[02/37] powerpc/64e: Fix wrong test in __ptep_test_and_clear_young()
        https://git.kernel.org/powerpc/c/5ea0bbaa32e8f54e9a57cfee4a3b8769b80be0d2

cheers