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authorShyam Thombre <sthombre@codeaurora.org>2020-06-10 14:09:44 +0300
committerWill Deacon <will@kernel.org>2020-06-15 18:58:13 +0300
commit8dd4daa04278d7437641962ed53b843c0b0ec4a9 (patch)
tree940b7e1e853326ce5c4bda070c79c52634f009de /arch/arm64
parent413d3ea6b775d77b2057f13a9af75875eb066156 (diff)
downloadlinux-8dd4daa04278d7437641962ed53b843c0b0ec4a9.tar.xz
arm64: mm: reset address tag set by kasan sw tagging
KASAN sw tagging sets a random tag of 8 bits in the top byte of the pointer returned by the memory allocating functions. So for the functions unaware of this change, the top 8 bits of the address must be reset which is done by the function arch_kasan_reset_tag(). Signed-off-by: Shyam Thombre <sthombre@codeaurora.org> Link: https://lore.kernel.org/r/1591787384-5823-1-git-send-email-sthombre@codeaurora.org Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/mm/mmu.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 990929c8837e..1df25f26571d 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -723,6 +723,7 @@ int kern_addr_valid(unsigned long addr)
pmd_t *pmdp, pmd;
pte_t *ptep, pte;
+ addr = arch_kasan_reset_tag(addr);
if ((((long)addr) >> VA_BITS) != -1UL)
return 0;