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Commit cabca8c0 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

MIPS: Enable hardened usercopy 



Enable CONFIG_HARDENED_USERCOPY checks for MIPS, calling check_object
size in all of copy_{to,from}_user(), __copy_{to,from}_user() &
__copy_{to,from}_user_inatomic().

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14371/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 3f5f0a44

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ config MIPS 
	select HANDLE_DOMAIN_IRQ

	select HAVE_EXIT_THREAD

	select HAVE_REGS_AND_STACK_ACCESS_API

	select HAVE_ARCH_HARDENED_USERCOPY



menu "Machine selection"

arch/mips/include/asm/uaccess.h

+18 −0
Original line number Diff line number Diff line
@@ -858,7 +858,10 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n); 
	__cu_to = (to);							\

	__cu_from = (from);						\

	__cu_len = (n);							\

									\

	check_object_size(__cu_from, __cu_len, true);			\

	might_fault();							\

									\

	if (eva_kernel_access())					\

		__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from,	\

						   __cu_len);		\
@@ -879,6 +882,9 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n); 
	__cu_to = (to);							\

	__cu_from = (from);						\

	__cu_len = (n);							\

									\

	check_object_size(__cu_from, __cu_len, true);			\

									\

	if (eva_kernel_access())					\

		__cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from,	\

						   __cu_len);		\
@@ -897,6 +903,9 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n); 
	__cu_to = (to);							\

	__cu_from = (from);						\

	__cu_len = (n);							\

									\

	check_object_size(__cu_to, __cu_len, false);			\

									\

	if (eva_kernel_access())					\

		__cu_len = __invoke_copy_from_kernel_inatomic(__cu_to,	\

							      __cu_from,\
@@ -931,6 +940,9 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n); 
	__cu_to = (to);							\

	__cu_from = (from);						\

	__cu_len = (n);							\

									\

	check_object_size(__cu_from, __cu_len, true);			\

									\

	if (eva_kernel_access()) {					\

		__cu_len = __invoke_copy_to_kernel(__cu_to,		\

						   __cu_from,		\
@@ -1123,6 +1135,9 @@ extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n); 
	__cu_to = (to);							\

	__cu_from = (from);						\

	__cu_len = (n);							\

									\

	check_object_size(__cu_to, __cu_len, false);			\

									\

	if (eva_kernel_access()) {					\

		__cu_len = __invoke_copy_from_kernel(__cu_to,		\

						     __cu_from,		\
@@ -1161,6 +1176,9 @@ extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n); 
	__cu_to = (to);							\

	__cu_from = (from);						\

	__cu_len = (n);							\

									\

	check_object_size(__cu_to, __cu_len, false);			\

									\

	if (eva_kernel_access()) {					\

		__cu_len = __invoke_copy_from_kernel(__cu_to,		\

						     __cu_from,		\