linux-hardening - Re: [PATCH 3/6] PKEY: Apply PKEY_ENFORCE

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Date:   Tue, 16 May 2023 15:23:44 -0700
From:   Jeff Xu <jeffxu@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     jeffxu@...omium.org, dave.hansen@...el.com, luto@...nel.org,
        jorgelo@...omium.org, groeck@...omium.org, jannh@...gle.com,
        sroettger@...gle.com, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 3/6] PKEY: Apply PKEY_ENFORCE_API to mprotect

On Tue, May 16, 2023 at 1:07 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Mon, May 15, 2023 at 01:05:49PM +0000, jeffxu@...omium.org wrote:
> > From: Jeff Xu <jeffxu@...gle.com>
> >
> > This patch enables PKEY_ENFORCE_API for the mprotect and
> > mprotect_pkey syscalls.
>
> All callers are from userspace -- this change looks like a no-op?
>
Yes. All callers are from user space now.
I am thinking about the future when someone adds a caller in kernel
code and may miss the check.
This is also consistent with munmap and other syscalls I plan to change.
There are comments on do_mprotect_pkey() to describe how this flag is used.


> -Kees
>
> --
> Kees Cook