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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
	Ard Biesheuvel <ardb@kernel.org>,
	linux-efi <linux-efi@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	Laszlo Ersek <lersek@redhat.com>,
	Leif Lindholm <leif@nuviainc.com>,
	Peter Jones <pjones@redhat.com>,
	Matthew Garrett <mjg59@google.com>,
	Alexander Graf <agraf@csgraf.de>,
	Ilias Apalodimas <ilias.apalodimas@linaro.org>,
	Heinrich Schuchardt <xypron.glpk@gmx.de>,
	Daniel Kiper <daniel.kiper@oracle.com>
Subject: Re: [PATCH 0/2] arch-agnostic initrd loading method for EFI systems
Date: Fri, 7 Feb 2020 15:26:37 -0500	[thread overview]
Message-ID: <20200207202637.GA3464906@rani.riverdale.lan> (raw)
In-Reply-To: <CAKv+Gu8Z3=cqbNxspLXAgM_8wEm+to2TWRjpaaC231MbwL2Ycw@mail.gmail.com>

On Fri, Feb 07, 2020 at 07:47:46PM +0000, Ard Biesheuvel wrote:
> On Fri, 7 Feb 2020 at 18:45, Arvind Sankar <nivedita@alum.mit.edu> wrote:
> >
> > On Thu, Feb 06, 2020 at 02:03:50PM +0000, Ard Biesheuvel wrote:
> > >   data structure. It also creates a time window where the initrd data sits
> > >   in memory, and can potentially be corrupted before the kernel is booted.
> > >
> >
> > I don't quite understand the time window aspect -- can you expand on
> > that? It seems like the same time window exists between when the kernel
> > is loaded and when it actually runs, no? Why is this more important for
> > initrd?
> 
> When using loadimage+startimage, the authentication and measurement of
> the kernel image occur during the call to loadimage(), even if the
> source of the load is memory itself, and startimage() is typically
> called right after.
> 
> The assumption is that it may help to make this time as short as
> possible for the initrd as well.

Ok, this is for when we can use LoadImage, that makes sense.

WARNING: multiple messages have this Message-ID
From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: linux-efi <linux-efi@vger.kernel.org>,
	Alexander Graf <agraf@csgraf.de>,
	Heinrich Schuchardt <xypron.glpk@gmx.de>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	Ilias Apalodimas <ilias.apalodimas@linaro.org>,
	Matthew Garrett <mjg59@google.com>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Peter Jones <pjones@redhat.com>,
	Leif Lindholm <leif@nuviainc.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 0/2] arch-agnostic initrd loading method for EFI systems
Date: Fri, 7 Feb 2020 15:26:37 -0500	[thread overview]
Message-ID: <20200207202637.GA3464906@rani.riverdale.lan> (raw)
In-Reply-To: <CAKv+Gu8Z3=cqbNxspLXAgM_8wEm+to2TWRjpaaC231MbwL2Ycw@mail.gmail.com>

On Fri, Feb 07, 2020 at 07:47:46PM +0000, Ard Biesheuvel wrote:
> On Fri, 7 Feb 2020 at 18:45, Arvind Sankar <nivedita@alum.mit.edu> wrote:
> >
> > On Thu, Feb 06, 2020 at 02:03:50PM +0000, Ard Biesheuvel wrote:
> > >   data structure. It also creates a time window where the initrd data sits
> > >   in memory, and can potentially be corrupted before the kernel is booted.
> > >
> >
> > I don't quite understand the time window aspect -- can you expand on
> > that? It seems like the same time window exists between when the kernel
> > is loaded and when it actually runs, no? Why is this more important for
> > initrd?
> 
> When using loadimage+startimage, the authentication and measurement of
> the kernel image occur during the call to loadimage(), even if the
> source of the load is memory itself, and startimage() is typically
> called right after.
> 
> The assumption is that it may help to make this time as short as
> possible for the initrd as well.

Ok, this is for when we can use LoadImage, that makes sense.

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  reply	other threads:[~2020-02-07 20:26 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-06 14:03 Ard Biesheuvel
2020-02-06 14:03 ` Ard Biesheuvel
2020-02-06 14:03 ` [PATCH 1/2] efi/libstub: add support for loading the initrd from a device path Ard Biesheuvel
2020-02-06 14:03   ` Ard Biesheuvel
2020-02-06 18:26   ` Heinrich Schuchardt
2020-02-06 18:26     ` Heinrich Schuchardt
2020-02-06 18:46     ` Ilias Apalodimas
2020-02-06 18:46       ` Ilias Apalodimas
2020-02-06 19:15       ` Heinrich Schuchardt
2020-02-06 19:15         ` Heinrich Schuchardt
2020-02-06 20:09         ` Ilias Apalodimas
2020-02-06 20:09           ` Ilias Apalodimas
2020-02-06 22:49           ` Heinrich Schuchardt
2020-02-06 22:49             ` Heinrich Schuchardt
2020-02-07  7:35             ` Ilias Apalodimas
2020-02-07  7:35               ` Ilias Apalodimas
2020-02-06 22:35     ` Ard Biesheuvel
2020-02-06 22:35       ` Ard Biesheuvel
2020-02-07  0:01       ` Heinrich Schuchardt
2020-02-07  0:01         ` Heinrich Schuchardt
2020-02-07  0:21         ` Ard Biesheuvel
2020-02-07  0:21           ` Ard Biesheuvel
2020-02-07  0:57           ` Heinrich Schuchardt
2020-02-07  0:57             ` Heinrich Schuchardt
2020-02-07  8:12             ` Ard Biesheuvel
2020-02-07  8:12               ` Ard Biesheuvel
2020-02-07 13:30               ` Heinrich Schuchardt
2020-02-07 13:30                 ` Heinrich Schuchardt
2020-02-07 13:58                 ` Ard Biesheuvel
2020-02-07 13:58                   ` Ard Biesheuvel
2020-02-07 14:18                   ` Alexander Graf
2020-02-07 14:18                     ` Alexander Graf
2020-02-07 15:30                     ` Ard Biesheuvel
2020-02-07 15:30                       ` Ard Biesheuvel
2020-02-07 15:35                     ` Heinrich Schuchardt
2020-02-07 15:35                       ` Heinrich Schuchardt
2020-02-07 11:09       ` Laszlo Ersek
2020-02-07 11:09         ` Laszlo Ersek
2020-02-07 11:03     ` Laszlo Ersek
2020-02-07 11:03       ` Laszlo Ersek
2020-02-07  9:48   ` Laszlo Ersek
2020-02-07  9:48     ` Laszlo Ersek
2020-02-07 12:36     ` Ard Biesheuvel
2020-02-07 12:36       ` Ard Biesheuvel
2020-02-10 14:26       ` Laszlo Ersek
2020-02-10 14:26         ` Laszlo Ersek
2020-02-09  6:39   ` Lukas Wunner
2020-02-09 11:35     ` Ard Biesheuvel
2020-02-09 11:35       ` Ard Biesheuvel
2020-02-06 14:03 ` [PATCH 2/2] efi/libstub: take noinitrd cmdline argument into account for devpath initrd Ard Biesheuvel
2020-02-06 14:03   ` Ard Biesheuvel
2020-02-06 18:33   ` Heinrich Schuchardt
2020-02-06 18:33     ` Heinrich Schuchardt
2020-02-06 23:44     ` Ard Biesheuvel
2020-02-06 23:44       ` Ard Biesheuvel
2020-02-12 16:01   ` Peter Jones
2020-02-12 16:01     ` Peter Jones
2020-02-07  9:09 ` [PATCH 0/2] arch-agnostic initrd loading method for EFI systems Laszlo Ersek
2020-02-07  9:09   ` Laszlo Ersek
2020-02-07  9:22   ` Laszlo Ersek
2020-02-07  9:22     ` Laszlo Ersek
2020-02-07 12:23     ` Ard Biesheuvel
2020-02-07 12:23       ` Ard Biesheuvel
2020-02-07 16:20       ` James Bottomley
2020-02-07 16:20         ` James Bottomley
2020-02-07 18:31         ` Ard Biesheuvel
2020-02-07 18:31           ` Ard Biesheuvel
2020-02-07 19:54           ` James Bottomley
2020-02-07 19:54             ` James Bottomley
2020-02-07 20:03             ` Ard Biesheuvel
2020-02-07 20:03               ` Ard Biesheuvel
2020-02-07 18:45 ` Arvind Sankar
2020-02-07 18:45   ` Arvind Sankar
2020-02-07 19:47   ` Ard Biesheuvel
2020-02-07 19:47     ` Ard Biesheuvel
2020-02-07 20:26     ` Arvind Sankar [this message]
2020-02-07 20:26       ` Arvind Sankar

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