Re: [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property

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To: Ard Biesheuvel <ardb@xxxxxxxxxx>
Subject: Re: [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Wed, 24 Jun 2020 08:21:26 -0700
Cc: Will Deacon <will@xxxxxxxxxx>, Fangrui Song <maskray@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Peter Collingbourne <pcc@xxxxxxxxxx>, James Morse <james.morse@xxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Masahiro Yamada <masahiroy@xxxxxxxxxx>, Arvind Sankar <nivedita@xxxxxxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Nathan Chancellor <natechancellor@xxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, clang-built-linux <clang-built-linux@xxxxxxxxxxxxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, linux-efi <linux-efi@xxxxxxxxxxxxxxx>, Linux ARM <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <CAMj1kXHBT4ei0xhyL4jD7=CNRsn1rh7w6jeYDLjVOv4na0Z38Q@mail.gmail.com>
References: <20200624014940.1204448-1-keescook@chromium.org> <20200624014940.1204448-4-keescook@chromium.org> <20200624033142.cinvg6rbg252j46d@google.com> <202006232143.66828CD3@keescook> <20200624104356.GA6134@willie-the-truck> <CAMj1kXHBT4ei0xhyL4jD7=CNRsn1rh7w6jeYDLjVOv4na0Z38Q@mail.gmail.com>

On Wed, Jun 24, 2020 at 12:46:32PM +0200, Ard Biesheuvel wrote:
> I'm not sure if there is a point to having PAC and/or BTI in the EFI
> stub, given that it runs under the control of the firmware, with its
> memory mappings and PAC configuration etc.

Is BTI being ignored when the firmware runs?

-- 
Kees Cook

Follow-Ups:
- Re: [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property
  - From: Ard Biesheuvel

References:
- [PATCH v3 0/9] Warn on orphan section placement
  - From: Kees Cook
- [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property
  - From: Kees Cook
- Re: [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property
  - From: Fangrui Song
- Re: [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property
  - From: Kees Cook
- Re: [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property
  - From: Will Deacon
- Re: [PATCH v3 3/9] efi/libstub: Remove .note.gnu.property
  - From: Ard Biesheuvel

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