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 08/16] ARM: 8797/1: spectre-v1.1: harden __copy_to_user
Date: Thu, 14 Feb 2019 09:49:22 -0500 [thread overview]
Message-ID: <20190214144930.27539-9-dave.long@linaro.org> (raw)
In-Reply-To: <20190214144930.27539-1-dave.long@linaro.org>
From: Julien Thierry <julien.thierry@arm.com>
Commit a1d09e074250fad24f1b993f327b18cc6812eb7a upstream.
Sanitize user pointer given to __copy_to_user, both for standard version
and memcopy version of the user accessor.
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/lib/copy_to_user.S | 6 +++++-
arch/arm/lib/uaccess_with_memcpy.c | 3 ++-
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/arm/lib/copy_to_user.S b/arch/arm/lib/copy_to_user.S
index caf5019d8161..970abe521197 100644
--- a/arch/arm/lib/copy_to_user.S
+++ b/arch/arm/lib/copy_to_user.S
@@ -94,6 +94,11 @@
ENTRY(__copy_to_user_std)
WEAK(arm_copy_to_user)
+#ifdef CONFIG_CPU_SPECTRE
+ get_thread_info r3
+ ldr r3, [r3, #TI_ADDR_LIMIT]
+ uaccess_mask_range_ptr r0, r2, r3, ip
+#endif
#include "copy_template.S"
@@ -108,4 +113,3 @@ ENDPROC(__copy_to_user_std)
rsb r0, r0, r2
copy_abort_end
.popsection
-
diff --git a/arch/arm/lib/uaccess_with_memcpy.c b/arch/arm/lib/uaccess_with_memcpy.c
index 6bd1089b07e0..f598d792bace 100644
--- a/arch/arm/lib/uaccess_with_memcpy.c
+++ b/arch/arm/lib/uaccess_with_memcpy.c
@@ -152,7 +152,8 @@ arm_copy_to_user(void __user *to, const void *from, unsigned long n)
n = __copy_to_user_std(to, from, n);
uaccess_restore(ua_flags);
} else {
- n = __copy_to_user_memcpy(to, from, n);
+ n = __copy_to_user_memcpy(uaccess_mask_range_ptr(to, n),
+ from, n);
}
return n;
}
--
2.17.1
next prev parent reply other threads:[~2019-02-14 14:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 14:49 [PATCH 4.9 00/16] V4.9 backport of more 32-bit arm spectre patches David Long
2019-02-14 14:49 ` [PATCH 4.9 01/16] ARM: 8789/1: signal: copy registers using __copy_to_user() David Long
2019-02-14 14:49 ` [PATCH 4.9 02/16] ARM: 8791/1: vfp: use __copy_to_user() when saving VFP state David Long
2019-02-14 14:49 ` [PATCH 4.9 03/16] ARM: 8792/1: oabi-compat: copy oabi events using __copy_to_user() David Long
2019-02-14 14:49 ` [PATCH 4.9 04/16] ARM: 8793/1: signal: replace __put_user_error with __put_user David Long
2019-02-14 14:49 ` [PATCH 4.9 05/16] ARM: 8794/1: uaccess: Prevent speculative use of the current addr_limit David Long
2019-02-14 14:49 ` [PATCH 4.9 06/16] ARM: 8795/1: spectre-v1.1: use put_user() for __put_user() David Long
2019-02-14 14:49 ` [PATCH 4.9 07/16] ARM: 8796/1: spectre-v1,v1.1: provide helpers for address sanitization David Long
2019-02-14 14:49 ` David Long [this message]
2019-02-14 14:49 ` [PATCH 4.9 09/16] ARM: 8810/1: vfp: Fix wrong assignement to ufp_exc David Long
2019-02-14 14:49 ` [PATCH 4.9 10/16] ARM: make lookup_processor_type() non-__init David Long
2019-02-14 14:49 ` [PATCH 4.9 11/16] ARM: split out processor lookup David Long
2019-02-14 14:49 ` [PATCH 4.9 12/16] ARM: clean up per-processor check_bugs method call David Long
2019-02-14 14:49 ` [PATCH 4.9 13/16] ARM: add PROC_VTABLE and PROC_TABLE macros David Long
2019-02-14 14:49 ` [PATCH 4.9 14/16] ARM: spectre-v2: per-CPU vtables to work around big.Little systems David Long
2019-02-14 14:49 ` [PATCH 4.9 15/16] ARM: ensure that processor vtables is not lost after boot David Long
2019-02-14 14:49 ` [PATCH 4.9 16/16] ARM: fix the cockup in the previous patch David Long
2019-02-14 18:02 ` [PATCH 4.9 00/16] V4.9 backport of more 32-bit arm spectre patches Julien Thierry
2019-02-17 19:09 ` Sasha Levin
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