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Message-ID: <20170210101329.GD28753@leverpostej>
Date: Fri, 10 Feb 2017 10:13:29 +0000
From: Mark Rutland <mark.rutland@....com>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: linux-efi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
leif.lindholm@...aro.org, catalin.marinas@....com,
linux@...linux.org.uk, kernel-hardening@...ts.openwall.com,
labbott@...oraproject.org
Subject: Re: [PATCH v2 05/14] arm64: efi: remove forbidden values from the
PE/COFF header
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@...aro.org>
I take it that in practice EFI implementations don't care about these?
Assuming so:
Acked-by: Mark Rutland <mark.rutland@....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
>
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