Subject: [PATCH for-stable-v4.4 31/53] ARM: spectre-v1: add array_index_mask_nospec() implementation

From: Ard Biesheuvel <[email-masked]>
Date: Tue, 5 Nov 2019 21:58:24 +0100

From: Russell King <[email-masked]>

Commit 1d4238c56f9816ce0f9c8dbe42d7f2ad81cb6613 upstream.

Add an implementation of the array_index_mask_nospec() function for
mitigating Spectre variant 1 throughout the kernel.

Signed-off-by: Russell King <[email-masked]>
Acked-by: Mark Rutland <[email-masked]>
Boot-tested-by: Tony Lindgren <[email-masked]>
Reviewed-by: Tony Lindgren <[email-masked]>
Signed-off-by: David A. Long <[email-masked]>
Signed-off-by: Greg Kroah-Hartman <[email-masked]>
Signed-off-by: Ard Biesheuvel <[email-masked]>
---
 arch/arm/include/asm/barrier.h | 21 ++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/arm/include/asm/barrier.h b/arch/arm/include/asm/barrier.h
index edd9e633a84b..8514b70704de 100644
--- a/arch/arm/include/asm/barrier.h
+++ b/arch/arm/include/asm/barrier.h
@@ -108,5 +108,26 @@ do {									\
 #define smp_mb__before_atomic()	smp_mb()
 #define smp_mb__after_atomic()	smp_mb()
 
+#ifdef CONFIG_CPU_SPECTRE
+static inline unsigned long array_index_mask_nospec(unsigned long idx,
+						    unsigned long sz)
+{
+	unsigned long mask;
+
+	asm volatile(
+		"cmp	%1, %2\n"
+	"	sbc	%0, %1, %1\n"
+	CSDB
+	: "=r" (mask)
+	: "r" (idx), "Ir" (sz)
+	: "cc");
+
+	return mask;
+}
+#define array_index_mask_nospec array_index_mask_nospec
+#endif
+
+#include <asm-generic/barrier.h>
+
 #endif /* !__ASSEMBLY__ */
 #endif /* __ASM_BARRIER_H */
-- 
2.17.1

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