linux-kernel - Re: [PATCH v6 7/7] mseal, system mappings: update mseal.rst

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Message-ID: <CABi2SkWzgcFo+PF58K2azNZ1BgmgM-7LtJ8NmOgscN6_NyEo=w@mail.gmail.com>
Date: Mon, 24 Feb 2025 13:54:56 -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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	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, 
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	mike.rapoport@...il.com
Subject: Re: [PATCH v6 7/7] mseal, system mappings: update mseal.rst

On Mon, Feb 24, 2025 at 1:06 PM Jeff Xu <jeffxu@...omium.org> wrote:
>
> On Mon, Feb 24, 2025 at 12:26 PM Liam R. Howlett
> <Liam.Howlett@...cle.com> wrote:
> >
> > * jeffxu@...omium.org <jeffxu@...omium.org> [250224 12:45]:
> > > From: Jeff Xu <jeffxu@...omium.org>
> > >
> > > Update memory sealing documentation to include details about system
> > > mappings.
> > >
> > > Signed-off-by: Jeff Xu <jeffxu@...omium.org>
> > > ---
> > >  Documentation/userspace-api/mseal.rst | 7 +++++++
> > >  1 file changed, 7 insertions(+)
> > >
> > > diff --git a/Documentation/userspace-api/mseal.rst b/Documentation/userspace-api/mseal.rst
> > > index 41102f74c5e2..10147281bf2d 100644
> > > --- a/Documentation/userspace-api/mseal.rst
> > > +++ b/Documentation/userspace-api/mseal.rst
> > > @@ -130,6 +130,13 @@ Use cases
> > >
> > >  - Chrome browser: protect some security sensitive data structures.
> >
> > Did you mean to drop this line?
> >
> Ah, thank you for catching that.
>
Actually, this isn't a problem here.
The "-" here is part of the text, for list, so that line is not dropped).

-Jeff


> -Jeff
>
>
> > >
> > > +- System mappings:
> > > +  If supported by an architecture (via CONFIG_ARCH_HAS_MSEAL_SYSTEM_MAPPINGS),
> > > +  the CONFIG_MSEAL_SYSTEM_MAPPINGS seals system mappings, e.g. vdso, vvar,
> > > +  uprobes, sigpage, vectors, etc. CHECKPOINT_RESTORE, UML, gVisor, rr are
> > > +  known to relocate or unmap system mapping, therefore this config can't be
> > > +  enabled universally.
> > > +
> > >  When not to use mseal
> > >  =====================
> > >  Applications can apply sealing to any virtual memory region from userspace,
> > > --
> > > 2.48.1.601.g30ceb7b040-goog
> > >