Messages in this thread Patch in this message | | | Date | Wed, 26 Feb 2020 13:38:53 -0800 | From | Kees Cook <> | Subject | Re: [PATCH v7 11/11] arm64: mm: Display guarded pages in ptdump |
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On Wed, Feb 26, 2020 at 03:57:14PM +0000, Mark Brown wrote: > v8.5-BTI introduces the GP field in stage 1 translation tables which > indicates that blocks and pages with it set are guarded pages for which > branch target identification checks should be performed. Decode this > when dumping the page tables to aid debugging. > > Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
-Kees
> --- > arch/arm64/mm/dump.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/arm64/mm/dump.c b/arch/arm64/mm/dump.c > index 860c00ec8bd3..78163b7a7dde 100644 > --- a/arch/arm64/mm/dump.c > +++ b/arch/arm64/mm/dump.c > @@ -145,6 +145,11 @@ static const struct prot_bits pte_bits[] = { > .val = PTE_UXN, > .set = "UXN", > .clear = " ", > + }, { > + .mask = PTE_GP, > + .val = PTE_GP, > + .set = "GP", > + .clear = " ", > }, { > .mask = PTE_ATTRINDX_MASK, > .val = PTE_ATTRINDX(MT_DEVICE_nGnRnE), > -- > 2.20.1 >
-- Kees Cook
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