From: Mark Rutland <mark.rutland@arm.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: linux-efi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
leif.lindholm@linaro.org, catalin.marinas@arm.com,
linux@armlinux.org.uk, kernel-hardening@lists.openwall.com,
labbott@fedoraproject.org
Subject: Re: [PATCH v2 05/14] arm64: efi: remove forbidden values from the PE/COFF header
Date: Fri, 10 Feb 2017 10:13:29 +0000 [thread overview]
Message-ID: <20170210101329.GD28753@leverpostej> (raw)
In-Reply-To: <1486554947-3964-6-git-send-email-ard.biesheuvel@linaro.org>
On Wed, Feb 08, 2017 at 11:55:38AM +0000, Ard Biesheuvel wrote:
> Bring the PE/COFF header in line with the PE/COFF spec, by setting
> NumberOfSymbols to 0, and removing the section alignment flags.
>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
I take it that in practice EFI implementations don't care about these?
Assuming so:
Acked-by: Mark Rutland <mark.rutland@arm.com>
Otherwise, we might want to fix this first, so that we can easily
backport it.
Thanks,
Mark.
> ---
> arch/arm64/kernel/efi-header.S | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm64/kernel/efi-header.S b/arch/arm64/kernel/efi-header.S
> index 9b24ce130afb..515624bbfcd0 100644
> --- a/arch/arm64/kernel/efi-header.S
> +++ b/arch/arm64/kernel/efi-header.S
> @@ -15,7 +15,7 @@ coff_header:
> .short 2 // nr_sections
> .long 0 // TimeDateStamp
> .long 0 // PointerToSymbolTable
> - .long 1 // NumberOfSymbols
> + .long 0 // NumberOfSymbols
> .short section_table - optional_header // SizeOfOptionalHeader
> .short 0x206 // Characteristics.
> // IMAGE_FILE_DEBUG_STRIPPED |
> @@ -88,7 +88,7 @@ section_table:
> .long 0 // PointerToLineNumbers
> .short 0 // NumberOfRelocations
> .short 0 // NumberOfLineNumbers
> - .long 0x42100040 // Characteristics (section flags)
> + .long 0x42000040 // Characteristics (section flags)
>
>
> .ascii ".text"
> @@ -104,7 +104,7 @@ section_table:
> .long 0 // PointerToLineNumbers
> .short 0 // NumberOfRelocations
> .short 0 // NumberOfLineNumbers
> - .long 0xe0500020 // Characteristics
> + .long 0xe0000020 // Characteristics
>
> #ifdef CONFIG_DEBUG_EFI
> /*
> --
> 2.7.4
>
next prev parent reply other threads:[~2017-02-10 10:13 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-08 11:55 [PATCH v2 00/14] arm64+ARM: efi: PE/COFF cleanup/hardening Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 01/14] include: pe.h: allow for use in assembly Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 02/14] include: pe.h: add some missing definitions Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 03/14] arm64: efi: move EFI header and related data to a separate .S file Ard Biesheuvel
2017-02-10 10:10 ` Mark Rutland
2017-02-08 11:55 ` [PATCH v2 04/14] arm64: efi: clean up Image header after PE header has been split off Ard Biesheuvel
2017-02-10 10:11 ` Mark Rutland
2017-02-10 14:30 ` Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 05/14] arm64: efi: remove forbidden values from the PE/COFF header Ard Biesheuvel
2017-02-10 10:13 ` Mark Rutland [this message]
2017-02-10 14:31 ` Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 06/14] arm64: efi: remove pointless dummy .reloc section Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 07/14] arm64: efi: replace open coded constants with symbolic ones Ard Biesheuvel
2017-02-10 10:19 ` Mark Rutland
2017-02-08 11:55 ` [PATCH v2 08/14] arm64: efi: split Image code and data into separate PE/COFF sections Ard Biesheuvel
[not found] ` <1486554947-3964-9-git-send-email-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-02-10 10:49 ` Mark Rutland
2017-02-10 14:28 ` Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 09/14] arm: compressed: put zImage header and EFI header in dedicated section Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 10/14] arm: efi: remove forbidden values from the PE/COFF header Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 11/14] arm: efi: remove pointless dummy .reloc section Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 12/14] arm: efi: replace open coded constants with symbolic ones Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 13/14] arm: efi: split zImage code and data into separate PE/COFF sections Ard Biesheuvel
2017-02-08 11:55 ` [PATCH v2 14/14] arm: efi: add PE/COFF debug table to EFI header Ard Biesheuvel
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