From 9d9208a15800f9f06f102f9aac1e8b323c3b8575 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Thu, 23 Jun 2016 15:10:13 -0700 Subject: sparc/uaccess: Enable hardened usercopy Enables CONFIG_HARDENED_USERCOPY checks on sparc. Based on code from PaX and grsecurity. Signed-off-by: Kees Cook --- arch/sparc/include/asm/uaccess_32.h | 14 ++++++++++---- arch/sparc/include/asm/uaccess_64.h | 11 +++++++++-- 2 files changed, 19 insertions(+), 6 deletions(-) (limited to 'arch/sparc/include') diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h index 57aca2792d29..341a5a133f48 100644 --- a/arch/sparc/include/asm/uaccess_32.h +++ b/arch/sparc/include/asm/uaccess_32.h @@ -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; } diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index e9a51d64974d..8bda94fab8e8 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h @@ -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; -- cgit From 81409e9e28058811c9ea865345e1753f8f677e44 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 31 Aug 2016 16:04:21 -0700 Subject: usercopy: fold builtin_const check into inline function Instead of having each caller of check_object_size() need to remember to check for a const size parameter, move the check into check_object_size() itself. This actually matches the original implementation in PaX, though this commit cleans up the now-redundant builtin_const() calls in the various architectures. Signed-off-by: Kees Cook --- arch/sparc/include/asm/uaccess_32.h | 9 +++------ arch/sparc/include/asm/uaccess_64.h | 7 +++---- 2 files changed, 6 insertions(+), 10 deletions(-) (limited to 'arch/sparc/include') diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h index 341a5a133f48..e722c510bb1b 100644 --- a/arch/sparc/include/asm/uaccess_32.h +++ b/arch/sparc/include/asm/uaccess_32.h @@ -249,8 +249,7 @@ 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 (!__builtin_constant_p(n)) - check_object_size(from, n, true); + check_object_size(from, n, true); return __copy_user(to, (__force void __user *) from, n); } else return n; @@ -258,16 +257,14 @@ static inline unsigned long copy_to_user(void __user *to, const void *from, unsi 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); + 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 (!__builtin_constant_p(n)) - check_object_size(to, n, false); + check_object_size(to, n, false); return __copy_user((__force void __user *) to, from, n); } else return n; diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index 8bda94fab8e8..37a315d0ddd4 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h @@ -212,8 +212,7 @@ copy_from_user(void *to, const void __user *from, unsigned long size) { unsigned long ret; - if (!__builtin_constant_p(size)) - check_object_size(to, size, false); + check_object_size(to, size, false); ret = ___copy_from_user(to, from, size); if (unlikely(ret)) @@ -233,8 +232,8 @@ copy_to_user(void __user *to, const void *from, unsigned long size) { unsigned long ret; - if (!__builtin_constant_p(size)) - check_object_size(from, size, true); + check_object_size(from, size, true); + ret = ___copy_to_user(to, from, size); if (unlikely(ret)) ret = copy_to_user_fixup(to, from, size); -- cgit From 917400cecb4b52b5cde5417348322bb9c8272fa6 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Mon, 22 Aug 2016 00:23:07 -0400 Subject: sparc32: fix copy_from_user() Cc: stable@vger.kernel.org Acked-by: David S. Miller Signed-off-by: Al Viro --- arch/sparc/include/asm/uaccess_32.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/sparc/include') diff --git a/arch/sparc/include/asm/uaccess_32.h b/arch/sparc/include/asm/uaccess_32.h index 341a5a133f48..035c89b7df5d 100644 --- a/arch/sparc/include/asm/uaccess_32.h +++ b/arch/sparc/include/asm/uaccess_32.h @@ -269,8 +269,10 @@ static inline unsigned long copy_from_user(void *to, const void __user *from, un if (!__builtin_constant_p(n)) check_object_size(to, n, false); return __copy_user((__force void __user *) to, from, n); - } else + } else { + memset(to, 0, n); return n; + } } static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n) -- cgit