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Commit 9d9208a1 authored by Kees Cook's avatar Kees Cook
Browse files

sparc/uaccess: Enable hardened usercopy 



Enables CONFIG_HARDENED_USERCOPY checks on sparc.

Based on code from PaX and grsecurity.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 1d3c1324

arch/sparc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ config SPARC 
	select OLD_SIGSUSPEND

	select ARCH_HAS_SG_CHAIN

	select CPU_NO_EFFICIENT_FFS

	select HAVE_ARCH_HARDENED_USERCOPY



config SPARC32

	def_bool !64BIT

arch/sparc/include/asm/uaccess_32.h

+10 −4
Original line number Diff line number Diff line
@@ -248,22 +248,28 @@ unsigned long __copy_user(void __user *to, const void __user *from, unsigned lon 


static inline unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)

{

	if (n && __access_ok((unsigned long) to, n))

	if (n && __access_ok((unsigned long) to, n)) {

		if (!__builtin_constant_p(n))

			check_object_size(from, n, true);

		return __copy_user(to, (__force void __user *) from, n);

	else

	} else

		return n;

}



static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)

{

	if (!__builtin_constant_p(n))

		check_object_size(from, n, true);

	return __copy_user(to, (__force void __user *) from, n);

}



static inline unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)

{

	if (n && __access_ok((unsigned long) from, n))

	if (n && __access_ok((unsigned long) from, n)) {

		if (!__builtin_constant_p(n))

			check_object_size(to, n, false);

		return __copy_user((__force void __user *) to, from, n);

	else

	} else

		return n;

}

arch/sparc/include/asm/uaccess_64.h

+9 −2
Original line number Diff line number Diff line
@@ -210,8 +210,12 @@ unsigned long copy_from_user_fixup(void *to, const void __user *from, 
static inline unsigned long __must_check

copy_from_user(void *to, const void __user *from, unsigned long size)

{

	unsigned long ret = ___copy_from_user(to, from, size);

	unsigned long ret;



	if (!__builtin_constant_p(size))

		check_object_size(to, size, false);



	ret = ___copy_from_user(to, from, size);

	if (unlikely(ret))

		ret = copy_from_user_fixup(to, from, size);
@@ -227,8 +231,11 @@ unsigned long copy_to_user_fixup(void __user *to, const void *from, 
static inline unsigned long __must_check

copy_to_user(void __user *to, const void *from, unsigned long size)

{

	unsigned long ret = ___copy_to_user(to, from, size);

	unsigned long ret;



	if (!__builtin_constant_p(size))

		check_object_size(from, size, true);

	ret = ___copy_to_user(to, from, size);

	if (unlikely(ret))

		ret = copy_to_user_fixup(to, from, size);

	return ret;