linux-hardening - Re: [PATCH 0/6] Memory Mapping (VMA) protection using PKU

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Date:   Tue, 16 May 2023 16:39:12 -0700
From:   Jeff Xu <jeffxu@...gle.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Kees Cook <keescook@...omium.org>, jeffxu@...omium.org,
        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 0/6] Memory Mapping (VMA) protection using PKU - set 1

On Tue, May 16, 2023 at 3:30 PM Dave Hansen <dave.hansen@...el.com> wrote:
>
> On 5/16/23 15:17, Jeff Xu wrote:
> >>> This set of patch covers mprotect/munmap, I plan to work on other
> >>> syscalls after this.
> >> Which ones are on your list currently?
> >>
> > mprotect/mprotect_pkey/munmap
> > mmap/mremap
> > madvice,brk,sbrk
>
> What about pkey_free()?
>
> Without that, someone can presumably free the pkey and then reallocate
> it without PKEY_ENFORCE_API.
>
Great catch. I will add it to the list.
Thanks!
-Jeff Xu

>