linux-hardening - Re: [PATCH v2 1/3] dm-inlinecrypt: Add inline encryption support

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Message-ID: <Zvu04AYu0zUEvjBs@infradead.org>
Date: Tue, 1 Oct 2024 01:37:52 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Eric Biggers <ebiggers@...nel.org>
Cc: Christoph Hellwig <hch@...radead.org>,
	Md Sadre Alam <quic_mdalam@...cinc.com>, axboe@...nel.dk,
	song@...nel.org, yukuai3@...wei.com, agk@...hat.com,
	snitzer@...nel.org, mpatocka@...hat.com, adrian.hunter@...el.com,
	quic_asutoshd@...cinc.com, ritesh.list@...il.com,
	ulf.hansson@...aro.org, andersson@...nel.org,
	konradybcio@...nel.org, kees@...nel.org, gustavoars@...nel.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, dm-devel@...ts.linux.dev,
	linux-mmc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-hardening@...r.kernel.org, quic_srichara@...cinc.com,
	quic_varada@...cinc.com
Subject: Re: [PATCH v2 1/3] dm-inlinecrypt: Add inline encryption support

On Tue, Sep 24, 2024 at 03:04:34PM -0700, Eric Biggers wrote:
> What about a block device ioctl, as was previously proposed
> (https://lore.kernel.org/linux-block/1658316391-13472-1-git-send-email-israelr@nvidia.com/T/#u)?

No.  This is a file system layer policy and needs to sit entirely above
the block layer instead of breaking abstraction boundaries.