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arm64: add pte_access_permitted_no_overlay()

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We do not want take POE into account when clearing the MTE tags.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-18-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Joey Gouly
2024-08-22 16:11:00 +01:00
committed by Will Deacon
parent 7f0ab60763
commit fc2d9cd330
1 changed files with 7 additions and 4 deletions
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arch/arm64/include/asm/pgtable.h
+7 -4
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@@ -156,8 +156,10 @@ static inline pteval_t __phys_to_pte_val(phys_addr_t phys)
* not set) must return false. PROT_NONE mappings do not have the
* PTE_VALID bit set.
*/
#define pte_access_permitted(pte, write) \
#define pte_access_permitted_no_overlay(pte, write) \
(((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) && (!(write) || pte_write(pte)))
#define pte_access_permitted(pte, write) \
pte_access_permitted_no_overlay(pte, write)
#define pmd_access_permitted(pmd, write) \
(pte_access_permitted(pmd_pte(pmd), (write)))
#define pud_access_permitted(pud, write) \
@@ -373,10 +375,11 @@ static inline void __sync_cache_and_tags(pte_t pte, unsigned int nr_pages)
/*
* If the PTE would provide user space access to the tags associated
* with it then ensure that the MTE tags are synchronised. Although
* pte_access_permitted() returns false for exec only mappings, they
* don't expose tags (instruction fetches don't check tags).
* pte_access_permitted_no_overlay() returns false for exec only
* mappings, they don't expose tags (instruction fetches don't check
* tags).
*/
if (system_supports_mte() && pte_access_permitted(pte, false) &&
if (system_supports_mte() && pte_access_permitted_no_overlay(pte, false) &&
!pte_special(pte) && pte_tagged(pte))
mte_sync_tags(pte, nr_pages);
}