mips: make copy_from_user() zero tail explicitly (ab0aca27) · Commits · 戴 / test

arch/mips/include/asm/uaccess.h

+7 −7

Original line number	Diff line number	Diff line
		@@ -1080,29 +1080,29 @@ extern size_t __copy_user_inatomic(void __to, const void __from, size_t __n);
		({ \
		void *__cu_to; \
		const void __user *__cu_from; \
		long __cu_len; \
		long __cu_len, __cu_res; \
		\
		__cu_to = (to); \
		__cu_from = (from); \
		__cu_len = (n); \
		__cu_res = __cu_len = (n); \
		\
		check_object_size(__cu_to, __cu_len, false); \
		\
		if (eva_kernel_access()) { \
		__cu_len = __invoke_copy_from_kernel(__cu_to, \
		__cu_res = __invoke_copy_from_kernel(__cu_to, \
		__cu_from, \
		__cu_len); \
		} else { \
		if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
		might_fault(); \
		__cu_len = __invoke_copy_from_user(__cu_to, \
		__cu_res = __invoke_copy_from_user(__cu_to, \
		__cu_from, \
		__cu_len); \
		} else { \
		memset(__cu_to, 0, __cu_len); \
		} \
		} \
		__cu_len; \
		if (unlikely(__cu_res)) \
		memset(__cu_to + __cu_len - __cu_res, 0, __cu_res); \
		__cu_res; \
		})

		#define __copy_in_user(to, from, n) \