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Date:   Fri, 18 Dec 2020 10:50:25 -0800
From:   Kees Cook <>
To:     Ulf Hansson <>
Cc:     Bhaskara Budiredla <>,
        Colin Cross <>,
        Tony Luck <>,
        Sunil Kovvuri Goutham <>,
        "" <>,
        Linux Kernel Mailing List <>,
        Christoph Hellwig <>
Subject: Re: [EXT] Re: [PATCH 1/2] mmc: Support kmsg dumper based on

On Wed, Dec 16, 2020 at 11:44:26AM +0100, Ulf Hansson wrote:
> In any case, I didn't catch *why* pstore needs to force block device
> drivers to implement specific pstore hooks to support the pstore file
> system. I don't think this is the way it should work, for many

For panic, pstore must avoid any path that might sleep. In a perfect
world, it should also use as little code as possible, to avoid
potentially tripping over areas of the kernel that might be broken.

Kees Cook

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