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Message-Id: <1467843928-29351-4-git-send-email-keescook@chromium.org>
Date: Wed, 6 Jul 2016 15:25:22 -0700
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
Rik van Riel <riel@...hat.com>,
Casey Schaufler <casey@...aufler-ca.com>,
PaX Team <pageexec@...email.hu>,
Brad Spengler <spender@...ecurity.net>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Michael Ellerman <mpe@...erman.id.au>,
Tony Luck <tony.luck@...el.com>,
Fenghua Yu <fenghua.yu@...el.com>,
"David S. Miller" <davem@...emloft.net>,
x86@...nel.org,
Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
Borislav Petkov <bp@...e.de>,
Mathias Krause <minipli@...glemail.com>,
Jan Kara <jack@...e.cz>,
Vitaly Wool <vitalywool@...il.com>,
Andrea Arcangeli <aarcange@...hat.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Laura Abbott <labbott@...oraproject.org>,
linux-arm-kernel@...ts.infradead.org,
linux-ia64@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
sparclinux@...r.kernel.org,
linux-arch@...r.kernel.org,
linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH 3/9] ARM: uaccess: Enable hardened usercopy
Enables CONFIG_HARDENED_USERCOPY checks on arm.
Based on code from PaX and grsecurity.
Signed-off-by: Kees Cook <keescook@...omium.org>
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/uaccess.h | 11 +++++++++--
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 90542db1220d..f56b29b3f57e 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -35,6 +35,7 @@ config ARM
select HARDIRQS_SW_RESEND
select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
+ select HAVE_ARCH_HARDENED_USERCOPY
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
select HAVE_ARCH_MMAP_RND_BITS if MMU
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 35c9db857ebe..7fb59199c6bb 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -496,7 +496,10 @@ arm_copy_from_user(void *to, const void __user *from, unsigned long n);
static inline unsigned long __must_check
__copy_from_user(void *to, const void __user *from, unsigned long n)
{
- unsigned int __ua_flags = uaccess_save_and_enable();
+ unsigned int __ua_flags;
+
+ check_object_size(to, n, false);
+ __ua_flags = uaccess_save_and_enable();
n = arm_copy_from_user(to, from, n);
uaccess_restore(__ua_flags);
return n;
@@ -511,11 +514,15 @@ static inline unsigned long __must_check
__copy_to_user(void __user *to, const void *from, unsigned long n)
{
#ifndef CONFIG_UACCESS_WITH_MEMCPY
- unsigned int __ua_flags = uaccess_save_and_enable();
+ unsigned int __ua_flags;
+
+ check_object_size(from, n, true);
+ __ua_flags = uaccess_save_and_enable();
n = arm_copy_to_user(to, from, n);
uaccess_restore(__ua_flags);
return n;
#else
+ check_object_size(from, n, true);
return arm_copy_to_user(to, from, n);
#endif
}
--
2.7.4
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