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arm64: fix fixmap copy for 16K pages and 48-bit VA 

With 16K pages and 48-bit VAs, the PGD level of table has two entries,
and so the fixmap shares a PGD with the kernel image. Since commit:

  f9040773b7 ("arm64: move kernel image to base of vmalloc area")

... we copy the existing fixmap to the new fine-grained page tables at
the PUD level in this case. When walking to the new PUD, we forgot to
offset the PGD entry and always used the PGD entry at index 0, but this
worked as the kernel image and fixmap were in the low half of the TTBR1
address space.

As of commit:

  14c127c957 ("arm64: mm: Flip kernel VA space")

... the kernel image and fixmap are in the high half of the TTBR1
address space, and hence use the PGD at index 1, but we didn't update
the fixmap copying code to account for this.

Thus, we'll erroneously try to copy the fixmap slots into a PUD under
the PGD entry at index 0. At the point we do so this PGD entry has not
been initialised, and thus we'll try to write a value to a small offset
from physical address 0, causing a number of potential problems.

Fix this be correctly offsetting the PGD. This is split over a few steps
for legibility.

Fixes: 14c127c957 ("arm64: mm: Flip kernel VA space")
Reported-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Acked-by: Steve Capper <Steve.Capper@arm.com>
Tested-by: Steve Capper <Steve.Capper@arm.com>
Tested-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Rutland 2019-08-27 16:57:08 +01:00 committed by Will Deacon
parent 34b5560db4
commit b333b0ba23
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm64/mm/mmu.c
View File

@ -647,6 +647,8 @@ static void __init map_kernel(pgd_t *pgdp)
set_pgd(pgd_offset_raw(pgdp, FIXADDR_START),
READ_ONCE(*pgd_offset_k(FIXADDR_START)));
} else if (CONFIG_PGTABLE_LEVELS > 3) {
pgd_t *bm_pgdp;
pud_t *bm_pudp;
/*
* The fixmap shares its top level pgd entry with the kernel
* mapping. This can really only occur when we are running
@ -654,9 +656,9 @@ static void __init map_kernel(pgd_t *pgdp)
* entry instead.
*/
BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
pud_populate(&init_mm,
pud_set_fixmap_offset(pgdp, FIXADDR_START),
lm_alias(bm_pmd));
bm_pgdp = pgd_offset_raw(pgdp, FIXADDR_START);
bm_pudp = pud_set_fixmap_offset(bm_pgdp, FIXADDR_START);
pud_populate(&init_mm, bm_pudp, lm_alias(bm_pmd));
pud_clear_fixmap();
} else {
BUG();