[PATCH v2 12/14] x86: Minimal SLAB alignment
From: Maciej Wieczor-Retman <hidden>
Date: 2025-02-18 08:20:07
Also in:
linux-mm, lkml, llvm
Subsystem:
kasan, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Andrey Ryabinin, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Adjust x86 minimal SLAB alignment to match KASAN granularity size. In tag-based mode the size changes to 16 bytes so the value needs to be 4. Signed-off-by: Maciej Wieczor-Retman <redacted> --- arch/x86/include/asm/kasan.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/include/asm/kasan.h b/arch/x86/include/asm/kasan.h
index 8829337a75fa..a75f0748a4b6 100644
--- a/arch/x86/include/asm/kasan.h
+++ b/arch/x86/include/asm/kasan.h@@ -36,6 +36,8 @@ #ifdef CONFIG_KASAN_SW_TAGS +#define ARCH_SLAB_MINALIGN (1ULL << KASAN_SHADOW_SCALE_SHIFT) + #define __tag_shifted(tag) FIELD_PREP(GENMASK_ULL(60, 57), tag) #define __tag_reset(addr) (sign_extend64((u64)(addr), 56)) #define __tag_get(addr) ((u8)FIELD_GET(GENMASK_ULL(60, 57), (u64)addr))
--
2.47.1