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From: Ard Biesheuvel <ardb@kernel.org>
To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
Cc: Kees Cook <keescook@chromium.org>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	kernel-dev@igalia.com, kernel@gpiccoli.net, anton@enomsg.org,
	ccross@android.com, tony.luck@intel.com,
	linux-efi@vger.kernel.org
Subject: Re: [PATCH 8/8] efi: pstore: Add module parameter for setting the record size
Date: Fri, 7 Oct 2022 17:06:44 +0200	[thread overview]
Message-ID: <CAMj1kXE6aObn7hGneGMMiJ-ss7YaiYDFL+HqktYt2WMUpZnFjQ@mail.gmail.com> (raw)
In-Reply-To: <2a341c4d-763e-cfa4-0537-93451d8614fa@igalia.com>

On Fri, 7 Oct 2022 at 15:46, Guilherme G. Piccoli <gpiccoli@igalia.com> wrote:
>
> On 07/10/2022 10:19, Ard Biesheuvel wrote:
> > [...]
> >
> > OVMF has
> >
> > OvmfPkg/OvmfPkgX64.dsc:
> > gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x2000
> > OvmfPkg/OvmfPkgX64.dsc:
> > gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x8400
> >
> > where the first one is without secure boot and the second with secure boot.
> >
> > Interestingly, the default is
> >
> > gEfiMdeModulePkgTokenSpaceGuid.PcdMaxVariableSize|0x400
> >
> > so this is probably where this 1k number comes from. So perhaps it is
> > better to leave it at 1k after all :-(
> >
>
> Oh darn...
>
> So, let's stick with 1024 then? If so, no need for re-submitting right?

Well, I did spot this oddity

        efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL);
        if (!efi_pstore_info.buf)
                return -ENOMEM;

       efi_pstore_info.bufsize = 1024;

So that hardcoded 4096 looks odd, but at least it is larger than the
default 1024. So what happens if you increase the record size to >
4096?

  reply	other threads:[~2022-10-07 15:07 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-06 22:42 [PATCH 0/8] Some pstore improvements Guilherme G. Piccoli
2022-10-06 22:42 ` [PATCH 1/8] pstore: Improve error reporting in case of backend overlap Guilherme G. Piccoli
2022-10-06 23:27   ` Kees Cook
2022-10-06 23:35     ` Guilherme G. Piccoli
2022-10-06 22:42 ` [PATCH 2/8] pstore: Expose kmsg_bytes as a module parameter Guilherme G. Piccoli
2022-10-06 23:32   ` Kees Cook
2022-10-12 15:33     ` Guilherme G. Piccoli
2022-10-12 17:58       ` Kees Cook
2022-11-01 19:08         ` Guilherme G. Piccoli
2022-10-06 22:42 ` [PATCH 3/8] pstore: Inform unregistered backend names as well Guilherme G. Piccoli
2022-10-06 22:42 ` [PATCH 4/8] pstore: Alert on backend write error Guilherme G. Piccoli
2022-10-06 23:27   ` Kees Cook
2022-10-06 23:34     ` Guilherme G. Piccoli
2022-10-06 23:44       ` Kees Cook
2022-10-06 22:42 ` [PATCH 5/8] pstore: Fix long-term implicit conversions in the compression routines Guilherme G. Piccoli
2022-10-06 23:36   ` Kees Cook
2022-10-07  8:47     ` Ard Biesheuvel
2022-10-07 19:37       ` Kees Cook
2022-10-08 14:14         ` Guilherme G. Piccoli
2022-10-08 15:53           ` Ard Biesheuvel
2022-10-08 16:03             ` Guilherme G. Piccoli
2022-10-08 17:52               ` Ard Biesheuvel
2022-10-08 18:12                 ` Guilherme G. Piccoli
2022-10-08 19:44                 ` Kees Cook
2022-10-10  7:24                   ` Ard Biesheuvel
2022-10-06 22:42 ` [PATCH 6/8] MAINTAINERS: Add a mailing-list for the pstore infrastructure Guilherme G. Piccoli
2022-10-06 23:22   ` Kees Cook
2022-10-06 23:29     ` Luck, Tony
2022-10-06 23:37       ` Kees Cook
2022-10-07 16:19         ` Luck, Tony
2022-10-07 16:21     ` Colin Cross
2022-10-07 16:32     ` Guilherme G. Piccoli
2022-10-07 19:25       ` Kees Cook
2022-10-06 22:42 ` [PATCH 7/8] efi: pstore: Follow convention for the efi-pstore backend name Guilherme G. Piccoli
2022-10-06 23:16   ` Kees Cook
2022-10-07  8:47     ` Ard Biesheuvel
2022-10-14 17:41   ` (subset) " Kees Cook
2022-10-06 22:42 ` [PATCH 8/8] efi: pstore: Add module parameter for setting the record size Guilherme G. Piccoli
2022-10-06 23:16   ` Kees Cook
2022-10-07  9:11     ` Ard Biesheuvel
2022-10-07 13:00       ` Guilherme G. Piccoli
2022-10-07 13:19         ` Ard Biesheuvel
2022-10-07 13:45           ` Guilherme G. Piccoli
2022-10-07 15:06             ` Ard Biesheuvel [this message]
2022-10-07 17:01               ` Guilherme G. Piccoli
2022-10-07 19:32             ` Kees Cook
2022-10-07 23:29               ` Guilherme G. Piccoli
2022-10-08  2:36                 ` Kees Cook
2022-10-06 23:24 ` [PATCH 0/8] Some pstore improvements Kees Cook
2022-10-12 15:50   ` Guilherme G. Piccoli
2022-10-12 17:59     ` Kees Cook

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