linux-kernel - Re: [PATCH v2 1/2] binfmt_elf_fdpic: support 64-bit systems

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Date:   Tue, 11 Jul 2023 08:51:38 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Greg Ungerer <gerg@...nel.org>
Cc:     linux-riscv@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, palmer@...belt.com,
        viro@...iv.linux.org.uk, ebiederm@...ssion.com, brauner@...nel.org
Subject: Re: [PATCH v2 1/2] binfmt_elf_fdpic: support 64-bit systems

On Tue, Jul 11, 2023 at 11:07:53PM +1000, Greg Ungerer wrote:
> The binfmt_flat_fdpic code has a number of 32-bit specific data
> structures associated with it. Extend it to be able to support and
> be used on 64-bit systems as well.
> 
> The new code defines a number of key 64-bit variants of the core
> elf-fdpic data structures - along side the existing 32-bit sized ones.
> A common set of generic named structures are defined to be either
> the 32-bit or 64-bit ones as required at compile time. This is a
> similar technique to that used in the ELF binfmt loader.
> 
> For example:
> 
>   elf_fdpic_loadseg is either elf32_fdpic_loadseg or elf64_fdpic_loadseg
>   elf_fdpic_loadmap is either elf32_fdpic_loadmap or elf64_fdpic_loadmap
> 
> the choice based on ELFCLASS32 or ELFCLASS64.
> 
> Signed-off-by: Greg Ungerer <gerg@...nel.org>

This looks good an is consistent with what the regular ELF loader does
with the sized types.

Acked-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook