linux-kernel - Re: [PATCH 5.10 11/38] swiotlb: rework "fix info leak with DMA_FROM

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Date:   Sat, 26 Mar 2022 11:41:17 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 5.10 11/38] swiotlb: rework "fix info leak with DMA_FROM_DEVICE"

On Sat, Mar 26, 2022 at 3:18 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:"
>
> Yes, I've been watching that thread.  This change is already in 5.15 and
> 5.16 kernels, and does solve one known security issue, so it's a tough
> call.

If you're following that thread, you'll have seen that I've reverted
it, and I actually think the security argument was bogus - the whole
commit was due to a misunderstanding of the actual direction of the
data transfer.

But hey, maybe I'm wrong. The only truly uncontested fact is that it
broke the ath9k driver.

           Linus