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arm64: memory: fix flipped VA space fallout

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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: 14c127c957 ("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>
This commit is contained in:
Mark Rutland 2019-08-14 14:28:47 +01:00 committed by Will Deacon
parent d0b3c32ed9
commit 233947ef16
2 changed files with 2 additions and 2 deletions
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2
arch/arm64/mm/dump.c
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@ -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",

2
arch/arm64/mm/fault.c
View File

@ -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;
}
/*