linux-kernel - Re: [PATCH 0/3] pstore: pass allocated memory region back to caller

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Message-ID: <CA+8MBb+z2ChjVYfBQ_2m2PvtQicYYv9FCa5ZFnGH2j1UvE-sdg@mail.gmail.com>
Date:	Mon, 14 Nov 2011 15:55:20 -0800
From:	Tony Luck <tony.luck@...il.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH 0/3] pstore: pass allocated memory region back to caller

On Mon, Nov 14, 2011 at 3:12 PM, Kees Cook <keescook@...omium.org> wrote:
> Since pstore's buf_lock cannot be held while doing the VFS population,
> these patches make it the backend's responsibility to pass up an allocated
> buffer instead during reads.

The split into three parts is good for review purposes - but I'll
squish them all together
into one commit to avoid breaking bisectability.

I'm trying to work out whether I should be worried about the removal
of the locks
around the:

   (*open)(...)
   while (size = (*read)(...)) {
   }
   (*close)()

section in pstore_get_records().  If someone tries to simultaneously mount
pstore in multiple places - will the upper level mount code serialize? I don't
think the backends will be happy if multiple callers execute that at the same
time.

-Tony
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