From: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
To: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
"H . Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: Ard Biesheuvel
<ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Peter Jones <pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "Lee,
Chun-Yi" <jlee-IBi9RG/b67k@public.gmane.org>,
Matthew Garrett <mjg59-JW9irJGTvgXQT0dZR+AlfA@public.gmane.org>,
Laszlo Ersek <lersek-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH 5/5] efi: Make efivarfs entries immutable by default
Date: Mon, 15 Feb 2016 10:50:04 +0000 [thread overview]
Message-ID: <20160215105004.GC2591@codeblueprint.co.uk> (raw)
In-Reply-To: <1455276432-9931-6-git-send-email-matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
On Fri, 12 Feb, at 11:27:12AM, Matt Fleming wrote:
> From: Peter Jones <pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>
> "rm -rf" is bricking some peoples' laptops because of variables being
> used to store non-reinitializable firmware driver data that's required
> to POST the hardware.
>
> These are 100% bugs, and they need to be fixed, but in the mean time it
> shouldn't be easy to *accidentally* brick machines.
>
> We have to have delete working, and picking which variables do and don't
> work for deletion is quite intractable, so instead make everything
> immutable by default (except for a whitelist), and make tools that
> aren't quite so broad-spectrum unset the immutable flag.
>
> Signed-off-by: Peter Jones <pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Tested-by: "Lee, Chun-Yi" <jlee-IBi9RG/b67k@public.gmane.org>
> Acked-by: Matthew Garrett <mjg59-JW9irJGTvgXQT0dZR+AlfA@public.gmane.org>
> Signed-off-by: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
> ---
> Documentation/filesystems/efivarfs.txt | 7 +++
> drivers/firmware/efi/vars.c | 87 +++++++++++++++++++-------
> fs/efivarfs/file.c | 70 +++++++++++++++++++++
> fs/efivarfs/inode.c | 30 +++++----
> fs/efivarfs/internal.h | 3 +-
> fs/efivarfs/super.c | 9 ++-
> include/linux/efi.h | 2 +
> tools/testing/selftests/efivarfs/efivarfs.sh | 19 +++++-
> tools/testing/selftests/efivarfs/open-unlink.c | 72 ++++++++++++++++++++-
> 9 files changed, 258 insertions(+), 41 deletions(-)
Folks, please hold off on merging this patch as Laszlo has raised a
good point about including the efi-pstore variables in the whitelist.
next prev parent reply other threads:[~2016-02-15 10:50 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-12 11:27 [GIT PULL 0/5] EFI urgent fixes Matt Fleming
2016-02-12 11:27 ` [PATCH 2/5] efi: Use ucs2_as_utf8 in efivarfs instead of open coding a bad version Matt Fleming
[not found] ` <1455276432-9931-3-git-send-email-matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-02-18 5:34 ` H. Peter Anvin
[not found] ` <12473B1F-5227-4E83-BAF9-06B69CF74D77-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-02-18 6:09 ` Matthew Garrett
[not found] ` <CAPeXnHuoQgrz1-_zkBKcskNE24jK2L5DSyWjbBoU+ceVzGZe0Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-18 9:36 ` H. Peter Anvin
[not found] ` <1455276432-9931-1-git-send-email-matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-02-12 11:27 ` [PATCH 1/5] lib/ucs2_string: Add ucs2 -> utf8 helper functions Matt Fleming
2016-02-12 11:27 ` [PATCH 3/5] efi: Do variable name validation tests in utf8 Matt Fleming
2016-02-12 11:27 ` [PATCH 4/5] efi: Make our variable validation list include the guid Matt Fleming
2016-02-12 11:27 ` [PATCH 5/5] efi: Make efivarfs entries immutable by default Matt Fleming
[not found] ` <1455276432-9931-6-git-send-email-matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-02-15 10:50 ` Matt Fleming [this message]
2016-02-16 12:15 ` [GIT PULL 0/5] EFI urgent fixes Ingo Molnar
2016-02-16 12:52 ` Matt Fleming
[not found] ` <20160216125236.GB2769-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-02-17 7:59 ` Ingo Molnar
2016-02-17 10:16 ` Matt Fleming
-- strict thread matches above, loose matches on Subject: below --
2016-02-03 13:02 [PATCH 1/5] Add ucs2 -> utf8 helper functions Peter Jones
[not found] ` <1454504567-2826-1-git-send-email-pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-03 13:02 ` [PATCH 5/5] efi: Make efivarfs entries immutable by default Peter Jones
[not found] ` <1454504567-2826-5-git-send-email-pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-03 14:13 ` Matt Fleming
[not found] ` <20160203141354.GH2597-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-02-03 14:20 ` Steve McIntyre
[not found] ` <20160203141959.GA3319-nt0JYOx6u4DQT0dZR+AlfA@public.gmane.org>
2016-02-03 14:50 ` Leif Lindholm
[not found] ` <20160203145005.GH10351-t77nlHhSwNqAroYi2ySoxKxOck334EZe@public.gmane.org>
2016-02-03 14:56 ` Matt Fleming
[not found] ` <20160203145621.GI2597-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-02-03 15:00 ` Steve McIntyre
2016-02-02 22:33 Preventing "rm -rf /sys/firmware/efi/efivars/" from damage Peter Jones
[not found] ` <1454452386-27709-1-git-send-email-pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-02 22:33 ` [PATCH 5/5] efi: Make efivarfs entries immutable by default Peter Jones
[not found] ` <1454452386-27709-6-git-send-email-pjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-03 13:16 ` Matt Fleming
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