__kimg_to_phys (which is used by virt_to_phys) assumes that the top byte
of the address is 0xff, which isn't always the case with KHWASAN enabled.
The solution is to reset the tag in __kimg_to_phys.
__lm_to_phys doesn't require any fixups, as it zeroes out the top byte
with the current implementation.
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
---
arch/arm64/include/asm/memory.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index febd54ff3354..c13b89257352 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -98,6 +98,10 @@
#define KASAN_THREAD_SHIFT 0
#endif
+#ifdef CONFIG_KASAN_TAGS
+#define KASAN_PTR_TAG_MASK (UL(0xff) << 56)
+#endif
+
#define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT)
/*
@@ -231,7 +235,12 @@ static inline unsigned long kaslr_offset(void)
#define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1)))
#define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
+
+#ifdef CONFIG_KASAN_TAGS
+#define __kimg_to_phys(addr) (((addr) | KASAN_PTR_TAG_MASK) - kimage_voffset)
+#else
#define __kimg_to_phys(addr) ((addr) - kimage_voffset)
+#endif
#define __virt_to_phys_nodebug(x) ({ \
phys_addr_t __x = (phys_addr_t)(x); \
--
2.17.0.rc0.231.g781580f067-goog
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