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@chromium.org>
(cherry picked from commit 73d35887e24da77e8d1321b2e92bd9b9128e2fc2)
Signed-off-by: Alex Shi <alex.shi@linaro.org>

diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index eb0249e3798112615fd5774d6f30229aa6241e53..2c86a4ef67424c0495c5438854d1794198a74b3f 100644 (file)
--- 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 4f3fb6ccbf2139b3e23798df6615e34ec5e4d09a..3d6b840c5c99aeba08852ab70ce40d1a56a65c0c 100644 (file)
--- 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;                                                                       \
 })