Re: [PATCH v7 11/11] arm64: mm: Display guarded pages in ptdump
From: Kees Cook <hidden>
Date: 2020-02-26 21:38:59
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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 <redacted> -Kees
quoted hunk ↗ jump to hunk
--- 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
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