From: Shyam Thombre Date: Wed, 10 Jun 2020 11:09:44 +0000 (+0530) Subject: arm64: mm: reset address tag set by kasan sw tagging X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8dd4daa04278d7437641962ed53b843c0b0ec4a9;p=linux.git 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 Link: https://lore.kernel.org/r/1591787384-5823-1-git-send-email-sthombre@codeaurora.org Signed-off-by: Will Deacon --- diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 990929c8837e4..1df25f26571d0 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;