linux-kernel - [PATCH 4.4 51/75] ARM: spectre-v1: add array_index_mask

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Date:   Fri,  8 Nov 2019 19:50:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linus.walleij@...aro.org, rmk+kernel@...linux.org.uk, Ard Biesheuvel" 
        <ardb@...nel.org>, Russell King <rmk+kernel@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Tony Lindgren <tony@...mide.com>,
        "David A. Long" <dave.long@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH 4.4 51/75] ARM: spectre-v1: add array_index_mask_nospec() implementation

From: Russell King <rmk+kernel@...linux.org.uk>

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 <rmk+kernel@...linux.org.uk>
Acked-by: Mark Rutland <mark.rutland@....com>
Boot-tested-by: Tony Lindgren <tony@...mide.com>
Reviewed-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: David A. Long <dave.long@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm/include/asm/barrier.h |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

--- 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 */