linux-kernel - Re: [PATCH v7 1/7] mseal, system mappings: kernel config and header change

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Message-ID: <bekot7b4mhgdsp636e4zltao4bnqoeiu46yehrwpuzydfgt3ya@t5njn75sbvym>
Date: Tue, 25 Feb 2025 10:22:56 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: jeffxu@...omium.org
Cc: akpm@...ux-foundation.org, keescook@...omium.org, jannh@...gle.com,
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Subject: Re: [PATCH v7 1/7] mseal, system mappings: kernel config and header
 change

* jeffxu@...omium.org <jeffxu@...omium.org> [250224 17:52]:
> From: Jeff Xu <jeffxu@...omium.org>
> 
> Provide infrastructure to mseal system mappings. Establish
> two kernel configs (CONFIG_MSEAL_SYSTEM_MAPPINGS,
> ARCH_HAS_MSEAL_SYSTEM_MAPPINGS) and VM_SEALED_SYSMAP
> macro for future patches.
> 
> Signed-off-by: Jeff Xu <jeffxu@...omium.org>
> ---
>  include/linux/mm.h | 10 ++++++++++
>  init/Kconfig       | 18 ++++++++++++++++++
>  security/Kconfig   | 18 ++++++++++++++++++
>  3 files changed, 46 insertions(+)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 7b1068ddcbb7..8b800941678d 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -4155,4 +4155,14 @@ int arch_get_shadow_stack_status(struct task_struct *t, unsigned long __user *st
>  int arch_set_shadow_stack_status(struct task_struct *t, unsigned long status);
>  int arch_lock_shadow_stack_status(struct task_struct *t, unsigned long status);
>  
> +
> +/*
> + * mseal of userspace process's system mappings.
> + */
> +#ifdef CONFIG_MSEAL_SYSTEM_MAPPINGS
> +#define VM_SEALED_SYSMAP	VM_SEALED
> +#else
> +#define VM_SEALED_SYSMAP	VM_NONE
> +#endif
> +
>  #endif /* _LINUX_MM_H */
> diff --git a/init/Kconfig b/init/Kconfig
> index d0d021b3fa3b..07435e33f965 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1882,6 +1882,24 @@ config ARCH_HAS_MEMBARRIER_CALLBACKS
>  config ARCH_HAS_MEMBARRIER_SYNC_CORE
>  	bool
>  
> +config ARCH_HAS_MSEAL_SYSTEM_MAPPINGS

I think we said ARCH_SUPPORTS_ for software features in v5 of the series
[1].  Can we also make this change please?

...

Thanks,
Liam

[1]. https://lore.kernel.org/all/202502131142.F5EE115C3A@keescook/