arm64: memory: fix flipped VA space fallout (233947ef) · Commits · 戴 / test

VA_START used to be the start of the TTBR1 address space, but now it's a point midway though. In a couple of places we still use VA_START to get the start of the TTBR1 address space, so let's fix these up to use PAGE_OFFSET instead. Fixes: ("arm64: mm: Flip kernel VA space") Signed-off-by:

Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Tested-by:

Steve Capper <steve.capper@arm.com> Reviewed-by:

Steve Capper <steve.capper@arm.com> Signed-off-by:

Will Deacon <will@kernel.org>

arch/arm64/mm/dump.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -400,7 +400,7 @@ void ptdump_check_wx(void)
		.check_wx = true,
		};

		walk_pgd(&st, &init_mm, VA_START);
		walk_pgd(&st, &init_mm, PAGE_OFFSET);
		note_page(&st, 0, 0, 0);
		if (st.wx_pages \|\| st.uxn_pages)
		pr_warn("Checked W+X mappings: FAILED, %lu W+X pages found, %lu non-UXN pages found\n",

arch/arm64/mm/fault.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -109,7 +109,7 @@ static inline bool is_ttbr0_addr(unsigned long addr)
		static inline bool is_ttbr1_addr(unsigned long addr)
		{
		/* TTBR1 addresses may have a tag if KASAN_SW_TAGS is in use */
		return arch_kasan_reset_tag(addr) >= VA_START;
		return arch_kasan_reset_tag(addr) >= PAGE_OFFSET;
		}

		/*

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