On Tue, Jun 13, 2023 at 2:13 AM Rick Edgecombe
<rick.p.edgeco...@intel.com> wrote:
> The x86 Shadow stack feature includes a new type of memory called shadow
> stack. This shadow stack memory has some unusual properties, which requires
> some core mm changes to function properly.
>
> One of these unusual properties is that shadow stack memory is writable,
> but only in limited ways. These limits are applied via a specific PTE
> bit combination. Nevertheless, the memory is writable, and core mm code
> will need to apply the writable permissions in the typical paths that
> call pte_mkwrite(). Future patches will make pte_mkwrite() take a VMA, so
> that the x86 implementation of it can know whether to create regular
> writable memory or shadow stack memory.
>
> But there are a couple of challenges to this. Modifying the signatures of
> each arch pte_mkwrite() implementation would be error prone because some
> are generated with macros and would need to be re-implemented. Also, some
> pte_mkwrite() callers operate on kernel memory without a VMA.
>
> So this can be done in a three step process. First pte_mkwrite() can be
> renamed to pte_mkwrite_novma() in each arch, with a generic pte_mkwrite()
> added that just calls pte_mkwrite_novma(). Next callers without a VMA can
> be moved to pte_mkwrite_novma(). And lastly, pte_mkwrite() and all callers
> can be changed to take/pass a VMA.
>
> Start the process by renaming pte_mkwrite() to pte_mkwrite_novma() and
> adding the pte_mkwrite() wrapper in linux/pgtable.h. Apply the same
> pattern for pmd_mkwrite(). Since not all archs have a pmd_mkwrite_novma(),
> create a new arch config HAS_HUGE_PAGE that can be used to tell if
> pmd_mkwrite() should be defined. Otherwise in the !HAS_HUGE_PAGE cases the
> compiler would not be able to find pmd_mkwrite_novma().
>
> No functional change.
>
> Cc: linux-...@vger.kernel.org
> Cc: linux-ker...@vger.kernel.org
> Cc: linux-al...@vger.kernel.org
> Cc: linux-snps-...@lists.infradead.org
> Cc: linux-arm-ker...@lists.infradead.org
> Cc: linux-c...@vger.kernel.org
> Cc: linux-hexa...@vger.kernel.org
> Cc: linux-i...@vger.kernel.org
> Cc: loonga...@lists.linux.dev
> Cc: linux-m...@lists.linux-m68k.org
> Cc: Michal Simek <mon...@monstr.eu>
> Cc: Dinh Nguyen <dingu...@kernel.org>
> Cc: linux-m...@vger.kernel.org
> Cc: openr...@lists.librecores.org
> Cc: linux-par...@vger.kernel.org
> Cc: linuxppc-...@lists.ozlabs.org
> Cc: linux-ri...@lists.infradead.org
> Cc: linux-s...@vger.kernel.org
> Cc: linux...@vger.kernel.org
> Cc: sparcli...@vger.kernel.org
> Cc: linux-um@lists.infradead.org
> Cc: linux-a...@vger.kernel.org
> Cc: linux...@kvack.org
> Suggested-by: Linus Torvalds <torva...@linuxfoundation.org>
> Signed-off-by: Rick Edgecombe <rick.p.edgeco...@intel.com>
> Link:
> https://lore.kernel.org/lkml/CAHk-=wizjsu7c9sfyzb3q04108stghff2wfbokgccgw7riz...@mail.gmail.com/
> arch/m68k/include/asm/mcf_pgtable.h | 2 +-
> arch/m68k/include/asm/motorola_pgtable.h | 2 +-
> arch/m68k/include/asm/sun3_pgtable.h | 2 +-
Acked-by: Geert Uytterhoeven <ge...@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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