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Date: Tue, 31 Aug 2021 11:56:06 +0300
From: Mike Rapoport <rppt@...nel.org>
To: Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: dave.hansen@...el.com, luto@...nel.org, peterz@...radead.org,
x86@...nel.org, akpm@...ux-foundation.org, keescook@...omium.org,
shakeelb@...gle.com, vbabka@...e.cz, linux-mm@...ck.org,
linux-hardening@...r.kernel.org,
kernel-hardening@...ts.openwall.com, ira.weiny@...el.com,
dan.j.williams@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 16/19] x86/mm: Protect page tables with PKS
On Mon, Aug 30, 2021 at 04:59:24PM -0700, Rick Edgecombe wrote:
> Write protect page tables with PKS. Toggle writeability inside the
> pgtable.h defined page table modifiction functions.
>
> Do not protect the direct map page tables as it is more complicated and
> will come in a later patch.
>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> ---
> arch/x86/boot/compressed/ident_map_64.c | 5 ++
> arch/x86/include/asm/pgtable.h | 18 ++++++-
> arch/x86/include/asm/pgtable_64.h | 33 ++++++++++--
> arch/x86/include/asm/pkeys_common.h | 1 -
> arch/x86/mm/pgtable.c | 71 ++++++++++++++++++++++---
> arch/x86/mm/pkeys.c | 1 +
> include/linux/pkeys.h | 1 +
> mm/Kconfig | 6 +++
> 8 files changed, 123 insertions(+), 13 deletions(-)
...
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 4184d0a7531d..0f8e8595a396 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -845,6 +845,12 @@ config ARCH_ENABLE_SUPERVISOR_PKEYS
> def_bool y
> depends on PKS_TEST || GENERAL_PKS_USER
>
> +config PKS_PG_TABLES
> + bool "PKS write protected page tables"
> + select GENERAL_PKS_USER
> + depends on !HIGHMEM && !X86_PAE && SPARSEMEM_VMEMMAP
Hmm, why is this x86-only feature is in mm/Kconfig?
> + depends on ARCH_HAS_SUPERVISOR_PKEYS
> +
> config PERCPU_STATS
> bool "Collect percpu memory statistics"
> help
> --
> 2.17.1
>
--
Sincerely yours,
Mike.
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