linux-kernel - Re: [PATCH qemu] x86: don't let decompressed kernel image clobber setup

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Message-ID: <Y7A+YELM7m5E2PUQ@zx2c4.com>
Date:   Sat, 31 Dec 2022 14:51:28 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "H. Peter Anvin" <hpa@...or.com>, pbonzini@...hat.com,
        ebiggers@...nel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
        qemu-devel@...gnu.org, ardb@...nel.org, kraxel@...hat.com,
        philmd@...aro.org
Subject: Re: [PATCH qemu] x86: don't let decompressed kernel image clobber
 setup_data

On Sat, Dec 31, 2022 at 02:48:12PM +0100, Borislav Petkov wrote:
> On Sat, Dec 31, 2022 at 02:44:08PM +0100, Jason A. Donenfeld wrote:
> > Are you using patch v1 minus the 62 MiB thing?
> 
> No, I want to see the original failure - the one that prompted you to send
> 
> https://lore.kernel.org/r/20221228143831.396245-1-Jason@zx2c4.com

That failure is unrelated to the ident mapping issue Peter and
I discussed. The original failure is described in the commit message:
decompression clobbers the data, so sd->next points to garbage.