Subject: Re: [PATCH v4 1/2] module: add elf_check_module_arch for module specific elf arch checks

From: Segher Boessenkool <[email-masked]>
Date: Tue, 15 Jun 2021 07:50:57 -0500

On Tue, Jun 15, 2021 at 02:17:40PM +0200, Jessica Yu wrote:
> +int __weak elf_check_module_arch(Elf_Ehdr *hdr)
> +{
> +       return 1;
> +}

But is this a good idea?  It isn't useful to be able to attempt to load
a module not compiled for your architecture, and it increases the attack
surface tremendously.  These checks are one of the few things that can
*not* be weak symbols, imo.

Segher