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arm64: mm: Display guarded pages in ptdump

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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>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2020-03-16 16:50:53 +00:00 committed by Catalin Marinas
parent 30685d789c
commit de48bb3692
1 changed files with 5 additions and 0 deletions
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5
arch/arm64/mm/dump.c
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@ -145,6 +145,11 @@ static const struct prot_bits pte_bits[] = {
.val = PTE_UXN, .val = PTE_UXN,
.set = "UXN", .set = "UXN",
.clear = " ", .clear = " ",
}, {
.mask = PTE_GP,
.val = PTE_GP,
.set = "GP",
.clear = " ",
}, { }, {
.mask = PTE_ATTRINDX_MASK, .mask = PTE_ATTRINDX_MASK,
.val = PTE_ATTRINDX(MT_DEVICE_nGnRnE), .val = PTE_ATTRINDX(MT_DEVICE_nGnRnE),