linux-hardening - Re: [RFC PATCH v1 1/1] exec: seal system mappings

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Message-ID: <20241005202025.GB24353@redhat.com>
Date: Sat, 5 Oct 2024 22:20:25 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: jeffxu@...omium.org
Cc: akpm@...ux-foundation.org, keescook@...omium.org, jannh@...gle.com,
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Subject: Re: [RFC PATCH v1 1/1] exec: seal system mappings

Sorry for the noise, forgot to mention...

On 10/04, jeffxu@...omium.org wrote:
>
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -1535,6 +1535,15 @@
>  			Permit 'security.evm' to be updated regardless of
>  			current integrity status.
>  
> +	exec.seal_system_mappings = [KNL]
> +			Format: { never | always }
> +			Seal system mappings: vdso, vvar, sigpage, uprobes,
> +			vsyscall.
> +			This overwrites KCONFIG CONFIG_SEAL_SYSTEM_MAPPINGS_*
> +			- 'never':  never seal system mappings.
> +			- 'always': always seal system mappings.
> +			If not specified or invalid, default is the KCONFIG value.

perhaps the documentation should also mention that this new parameter has
no effect if CONFIG_64BIT=n.

Oleg.