From: David Long <dave.long@linaro.org>
To: stable@vger.kernel.org,
Russell King - ARM Linux <linux@armlinux.org.uk>,
Florian Fainelli <f.fainelli@gmail.com>,
Tony Lindgren <tony@atomide.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Mark Rutland <mark.rutland@arm.com>
Cc: Greg KH <gregkh@linuxfoundation.org>, Mark Brown <broonie@kernel.org>
Subject: [PATCH 4.9 V2 17/24] ARM: spectre-v1: add array_index_mask_nospec() implementation
Date: Wed, 7 Nov 2018 11:43:55 -0500 [thread overview]
Message-ID: <20181107164402.9380-18-dave.long@linaro.org> (raw)
In-Reply-To: <20181107164402.9380-1-dave.long@linaro.org>
From: Russell King <rmk+kernel@armlinux.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@armlinux.org.uk>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Boot-tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David A. Long <dave.long@linaro.org>
---
arch/arm/include/asm/barrier.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/arch/arm/include/asm/barrier.h b/arch/arm/include/asm/barrier.h
index 6f00dac6ad8e..513e03d138ea 100644
--- a/arch/arm/include/asm/barrier.h
+++ b/arch/arm/include/asm/barrier.h
@@ -75,6 +75,25 @@ extern void arm_heavy_mb(void);
#define __smp_rmb() __smp_mb()
#define __smp_wmb() dmb(ishst)
+#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__ */
--
2.17.1
next prev parent reply other threads:[~2018-11-08 2:15 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-07 16:43 [PATCH 4.9 V2 00/24] V4.9 backport of 32-bit arm spectre patches David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 01/24] ARM: add more CPU part numbers for Cortex and Brahma B15 CPUs David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 02/24] ARM: bugs: prepare processor bug infrastructure David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 03/24] ARM: bugs: hook processor bug checking into SMP and suspend paths David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 04/24] ARM: bugs: add support for per-processor bug checking David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 05/24] ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 06/24] ARM: spectre-v2: harden branch predictor on context switches David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 07/24] ARM: spectre-v2: add Cortex A8 and A15 validation of the IBE bit David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 08/24] ARM: spectre-v2: harden user aborts in kernel space David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 09/24] ARM: spectre-v2: add firmware based hardening David Long
2018-11-12 16:54 ` Russell King - ARM Linux
2018-11-13 14:23 ` Marc Zyngier
2018-11-13 15:16 ` David Long
2018-11-13 17:36 ` Marc Zyngier
2018-11-13 17:54 ` Russell King - ARM Linux
2018-11-13 16:43 ` Tony Lindgren
2018-11-13 18:08 ` Florian Fainelli
2018-11-20 10:59 ` Russell King - ARM Linux
2018-11-20 11:15 ` Greg KH
2018-11-20 15:30 ` David Long
2018-11-20 16:42 ` Marc Zyngier
2018-11-20 16:24 ` David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 10/24] ARM: spectre-v2: warn about incorrect context switching functions David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 11/24] ARM: KVM: invalidate BTB on guest exit for Cortex-A12/A17 David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 12/24] ARM: KVM: invalidate icache on guest exit for Cortex-A15 David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 13/24] ARM: spectre-v2: KVM: invalidate icache on guest exit for Brahma B15 David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 14/24] ARM: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 15/24] ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1 David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 16/24] ARM: spectre-v1: add speculation barrier (csdb) macros David Long
2018-11-07 16:43 ` David Long [this message]
2018-11-07 16:43 ` [PATCH 4.9 V2 18/24] ARM: spectre-v1: fix syscall entry David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 19/24] ARM: signal: copy registers using __copy_from_user() David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 20/24] ARM: vfp: use __copy_from_user() when restoring VFP state David Long
2018-11-07 16:43 ` [PATCH 4.9 V2 21/24] ARM: oabi-compat: copy semops using __copy_from_user() David Long
2018-11-07 16:44 ` [PATCH 4.9 V2 22/24] ARM: use __inttype() in get_user() David Long
2018-11-07 16:44 ` [PATCH 4.9 V2 23/24] ARM: spectre-v1: use get_user() for __get_user() David Long
2018-11-07 16:44 ` [PATCH 4.9 V2 24/24] ARM: spectre-v1: mitigate user accesses David Long
2018-11-12 15:27 ` [PATCH 4.9 V2 00/24] V4.9 backport of 32-bit arm spectre patches Russell King - ARM Linux
2018-11-21 18:27 ` Greg KH
2018-11-21 19:13 ` David Long
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