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

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Message-ID: <CABi2SkXSSmmMExLkwEH8GVknf0eaAZRQ+phvu1FLBR2wkJwQvw@mail.gmail.com>
Date: Tue, 25 Feb 2025 16:04:01 -0800
From: Jeff Xu <jeffxu@...omium.org>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>, jeffxu@...omium.org, akpm@...ux-foundation.org, 
	keescook@...omium.org, jannh@...gle.com, torvalds@...ux-foundation.org, 
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	oleg@...hat.com, avagin@...il.com, benjamin@...solutions.net, 
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, 
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	mike.rapoport@...il.com
Subject: Re: [PATCH v7 1/7] mseal, system mappings: kernel config and header change

On Tue, Feb 25, 2025 at 7:23 AM Liam R. Howlett <Liam.Howlett@...cle.com> wrote:
>
> * 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?
>
Sure.



> ...
>
> Thanks,
> Liam
>
> [1]. https://lore.kernel.org/all/202502131142.F5EE115C3A@keescook/