Thread (49 messages) 49 messages, 3 authors, 2020-10-09

Re: [PATCH v4 30/39] arm64: kasan: Enable TBI EL1

From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2020-10-02 14:11:01
Also in: linux-mm, lkml

On Fri, Oct 02, 2020 at 01:10:31AM +0200, Andrey Konovalov wrote:
quoted hunk ↗ jump to hunk
From: Vincenzo Frascino <vincenzo.frascino@arm.com>

Hardware tag-based KASAN relies on Memory Tagging Extension (MTE) that is
built on top of the Top Byte Ignore (TBI) feature.

Enable in-kernel TBI when CONFIG_KASAN_HW_TAGS is turned on by enabling
the TCR_TBI1 bit in proc.S.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Co-developed-by: Andrey Konovalov <redacted>
Signed-off-by: Andrey Konovalov <redacted>
---
Change-Id: I91944903bc9c9c9044f0d50e74bcd6b9971d21ff
---
 arch/arm64/mm/proc.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 6c1a6621d769..7c3304fb15d9 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -46,7 +46,7 @@
 #endif
 
 #ifdef CONFIG_KASAN_HW_TAGS
-#define TCR_KASAN_HW_FLAGS SYS_TCR_EL1_TCMA1
+#define TCR_KASAN_HW_FLAGS SYS_TCR_EL1_TCMA1 | TCR_TBI1
 #else
 #define TCR_KASAN_HW_FLAGS 0
 #endif
Please merge this patch with the one one introducing TCR_KASAN_HW_FLAGS,
no need to have both around. You can add my Reviewed-by on that one.

-- 
Catalin

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Keyboard shortcuts
hback out one level
jnext message in thread
kprevious message in thread
ldrill in
Escclose help / fold thread tree
?toggle this help