On Mon, Mar 08, 2021 at 05:10:23PM +0100, Andrey Konovalov wrote:
> When CONFIG_DEBUG_VIRTUAL is enabled, the default page_to_virt() macro
> implementation from include/linux/mm.h is used. That definition doesn't
> account for KASAN tags, which leads to no tags on page_alloc allocations.
>
> Provide an arm64-specific definition for page_to_virt() when
> CONFIG_DEBUG_VIRTUAL is enabled that takes care of KASAN tags.
>
> Fixes: 2813b9c02962 ("kasan, mm, arm64: tag non slab memory allocated via pagealloc")
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> ---
> arch/arm64/include/asm/memory.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
> index c759faf7a1ff..0aabc3be9a75 100644
> --- a/arch/arm64/include/asm/memory.h
> +++ b/arch/arm64/include/asm/memory.h
> @@ -328,6 +328,11 @@ static inline void *phys_to_virt(phys_addr_t x)
> #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
>
> #if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL)
> +#define page_to_virt(x) ({ \
> + __typeof__(x) __page = x; \
> + void *__addr = __va(page_to_phys(__page)); \
> + (void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
> +})
> #define virt_to_page(x) pfn_to_page(virt_to_pfn(x))
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
