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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>,
        Julien Thierry <julien.thierry@arm.com>,
        Tony Lindgren <tony@atomide.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Greg KH <gregkh@linuxfoundation.org>,
        Mark Rutland <mark.rutland@arm.com>
Cc:     Will Deacon <will.deacon@arm.com>, Mark Brown <broonie@kernel.org>,
        linux-kernel@vger.kernel.org
Subject: [PATCH 4.9 05/16] ARM: 8794/1: uaccess: Prevent speculative use of the current addr_limit
Date:   Thu, 14 Feb 2019 09:49:19 -0500
Message-Id: <20190214144930.27539-6-dave.long@linaro.org>
In-Reply-To: <20190214144930.27539-1-dave.long@linaro.org>
References: <20190214144930.27539-1-dave.long@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Julien Thierry <julien.thierry@arm.com>

Commit 621afc677465db231662ed126ae1f355bf8eac47 upstream.

A mispredicted conditional call to set_fs could result in the wrong
addr_limit being forwarded under speculation to a subsequent access_ok
check, potentially forming part of a spectre-v1 attack using uaccess
routines.

This patch prevents this forwarding from taking place, but putting heavy
barriers in set_fs after writing the addr_limit.

Porting commit c2f0ad4fc089cff8 ("arm64: uaccess: Prevent speculative use
of the current addr_limit").

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David A. Long <dave.long@linaro.org>
---
 arch/arm/include/asm/uaccess.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 7b17460127fd..9ae888775743 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -99,6 +99,14 @@ extern int __put_user_bad(void);
 static inline void set_fs(mm_segment_t fs)
 {
 	current_thread_info()->addr_limit = fs;
+
+	/*
+	 * Prevent a mispredicted conditional call to set_fs from forwarding
+	 * the wrong address limit to access_ok under speculation.
+	 */
+	dsb(nsh);
+	isb();
+
 	modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
 }
 
-- 
2.17.1