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From: "Nicholas Piggin" <npiggin@gmail.com>
To: "Benjamin Gray" <bgray@linux.ibm.com>, <linuxppc-dev@lists.ozlabs.org>
Cc: linux-hardening@vger.kernel.org, ajd@linux.ibm.com,
	cmr@bluescreens.de, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 13/13] Documentation: Document PowerPC kernel DEXCR interface
Date: Tue, 07 Mar 2023 15:40:53 +1000	[thread overview]
Message-ID: <CQZWS8VFIL3Q.G9POORQXDKE0@bobo> (raw)
In-Reply-To: <20221128024458.46121-14-bgray@linux.ibm.com>

On Mon Nov 28, 2022 at 12:44 PM AEST, Benjamin Gray wrote:
> Describe the DEXCR and document how to interact with it via the
> prctl and sysctl interfaces.

Oh you've got the docs here, sorry. Thanks for that. I don't know enough
yet to give much useful feedback on the API. I think at least all the
mechanism stuff up to the prctl API looks pretty straightfoward so would
like to get that merged if we can.

Might need a bit more time and discussion on the API. Interestingly
because the hashchk aspect is architectural, we may not be able to
necessarily sanely enable that, because if it was disabled to start
out with, our callchain up to the prctl call I think would have no
return hashes set so we'd immediately fail on our first return.

Thanks,
Nick


  reply	other threads:[~2023-03-07  5:41 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-28  2:44 [RFC PATCH 00/13] Add DEXCR support Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 01/13] powerpc/book3s: Add missing <linux/sched.h> include Benjamin Gray
2023-03-07  4:28   ` Nicholas Piggin
2022-11-28  2:44 ` [RFC PATCH 02/13] powerpc: Add initial Dynamic Execution Control Register (DEXCR) support Benjamin Gray
2023-03-07  4:45   ` Nicholas Piggin
2023-03-09 23:46     ` Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 03/13] powerpc/dexcr: Handle hashchk exception Benjamin Gray
2022-11-29 10:39   ` Nicholas Piggin
2022-11-29 22:04     ` Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 04/13] powerpc/dexcr: Support userspace ROP protection Benjamin Gray
2023-03-07  5:05   ` Nicholas Piggin
2023-03-07  5:37     ` Benjamin Gray
2023-03-21  4:51       ` Nicholas Piggin
2022-11-28  2:44 ` [RFC PATCH 05/13] prctl: Define PowerPC DEXCR interface Benjamin Gray
2023-03-07  5:07   ` Nicholas Piggin
2022-11-28  2:44 ` [RFC PATCH 06/13] powerpc/dexcr: Add prctl implementation Benjamin Gray
2023-03-07  5:12   ` Nicholas Piggin
2022-11-28  2:44 ` [RFC PATCH 07/13] powerpc/dexcr: Add sysctl entry for SBHE system override Benjamin Gray
2023-03-07  5:30   ` Nicholas Piggin
2023-03-07  5:58     ` Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 08/13] powerpc/dexcr: Add enforced userspace ROP protection config Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 09/13] selftests/powerpc: Add more utility macros Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 10/13] selftests/powerpc: Add hashst/hashchk test Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 11/13] selftests/powerpc: Add DEXCR prctl, sysctl interface test Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 12/13] selftests/powerpc: Add DEXCR status utility lsdexcr Benjamin Gray
2022-11-28  2:44 ` [RFC PATCH 13/13] Documentation: Document PowerPC kernel DEXCR interface Benjamin Gray
2023-03-07  5:40   ` Nicholas Piggin [this message]
2023-03-07  5:52     ` Benjamin Gray
2022-11-28  4:05 ` [RFC PATCH 00/13] Add DEXCR support Russell Currey

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