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Message-Id: <1467843928-29351-6-git-send-email-keescook@chromium.org>
Date: Wed, 6 Jul 2016 15:25:24 -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 5/9] ia64/uaccess: Enable hardened usercopy
Enables CONFIG_HARDENED_USERCOPY checks on ia64.
Based on code from PaX and grsecurity.
Signed-off-by: Kees Cook <keescook@...omium.org>
---
arch/ia64/Kconfig | 1 +
arch/ia64/include/asm/uaccess.h | 18 +++++++++++++++---
2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index f80758cb7157..32a87ef516a0 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -53,6 +53,7 @@ config IA64
select MODULES_USE_ELF_RELA
select ARCH_USE_CMPXCHG_LOCKREF
select HAVE_ARCH_AUDITSYSCALL
+ select HAVE_ARCH_HARDENED_USERCOPY
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/arch/ia64/include/asm/uaccess.h b/arch/ia64/include/asm/uaccess.h
index 2189d5ddc1ee..465c70982f40 100644
--- a/arch/ia64/include/asm/uaccess.h
+++ b/arch/ia64/include/asm/uaccess.h
@@ -241,12 +241,18 @@ extern unsigned long __must_check __copy_user (void __user *to, const void __use
static inline unsigned long
__copy_to_user (void __user *to, const void *from, unsigned long count)
{
+ if (!__builtin_constant_p(count))
+ check_object_size(from, count, true);
+
return __copy_user(to, (__force void __user *) from, count);
}
static inline unsigned long
__copy_from_user (void *to, const void __user *from, unsigned long count)
{
+ if (!__builtin_constant_p(count))
+ check_object_size(to, count, false);
+
return __copy_user((__force void __user *) to, from, count);
}
@@ -258,8 +264,11 @@ __copy_from_user (void *to, const void __user *from, unsigned long count)
const void *__cu_from = (from); \
long __cu_len = (n); \
\
- if (__access_ok(__cu_to, __cu_len, get_fs())) \
- __cu_len = __copy_user(__cu_to, (__force void __user *) __cu_from, __cu_len); \
+ if (__access_ok(__cu_to, __cu_len, get_fs())) { \
+ if (!__builtin_constant_p(n)) \
+ check_object_size(__cu_from, __cu_len, true); \
+ __cu_len = __copy_user(__cu_to, (__force void __user *) __cu_from, __cu_len); \
+ } \
__cu_len; \
})
@@ -270,8 +279,11 @@ __copy_from_user (void *to, const void __user *from, unsigned long count)
long __cu_len = (n); \
\
__chk_user_ptr(__cu_from); \
- if (__access_ok(__cu_from, __cu_len, get_fs())) \
+ if (__access_ok(__cu_from, __cu_len, get_fs())) { \
+ if (!__builtin_constant_p(n)) \
+ check_object_size(__cu_to, __cu_len, false); \
__cu_len = __copy_user((__force void __user *) __cu_to, __cu_from, __cu_len); \
+ } \
__cu_len; \
})
--
2.7.4
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