linux-kernel - Re: [syzbot] [crypto?] general protection fault in scatterwalk

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Message-ID: <CAKEwX=NHdr9=hUBiZhnLZyRPsp=JwN3Vkwud2XEn3=pNurYGpQ@mail.gmail.com>
Date: Tue, 26 Dec 2023 16:23:53 -0800
From: Nhat Pham <nphamcs@...il.com>
To: Chris Li <chrisl@...nel.org>
Cc: syzbot <syzbot+3eff5e51bf1db122a16e@...kaller.appspotmail.com>, 
	akpm@...ux-foundation.org, davem@...emloft.net, herbert@...dor.apana.org.au, 
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com, yosryahmed@...gle.com, 
	zhouchengming@...edance.com
Subject: Re: [syzbot] [crypto?] general protection fault in
 scatterwalk_copychunks (5)

On Tue, Dec 26, 2023 at 3:30 PM Chris Li <chrisl@...nel.org> wrote:
>
> Again, sorry I was looking at the decompression side rather than the
> compression side. The compression side does not even offer a safe
> version of the compression function.
> That seems to be dangerous. It seems for now we should make the zswap
> roll back to 2 page buffer until we have a safe way to do compression
> without overwriting the output buffers.

Unfortunately, I think this is the way - at least until we rework the
crypto/compression API (if that's even possible?).
I still think the 2 page buffer is dumb, but it is what it is :(