Commit 81409e9e authored by Kees Cook's avatar Kees Cook

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: default avatarKees Cook <keescook@chromium.org>
parent e6971009
......@@ -241,7 +241,6 @@ 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);
......@@ -250,7 +249,6 @@ __copy_to_user (void __user *to, const void *from, unsigned long 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);
......@@ -265,7 +263,6 @@ __copy_from_user (void *to, const void __user *from, unsigned long count)
long __cu_len = (n); \
\
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); \
} \
......@@ -280,7 +277,6 @@ __copy_from_user (void *to, const void __user *from, unsigned long count)
\
__chk_user_ptr(__cu_from); \
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); \
} \
......
......@@ -311,13 +311,11 @@ static inline unsigned long copy_from_user(void *to,
unsigned long over;
if (access_ok(VERIFY_READ, from, n)) {
if (!__builtin_constant_p(n))
check_object_size(to, n, false);
return __copy_tofrom_user((__force void __user *)to, from, n);
}
if ((unsigned long)from < TASK_SIZE) {
over = (unsigned long)from + n - TASK_SIZE;
if (!__builtin_constant_p(n - over))
check_object_size(to, n - over, false);
return __copy_tofrom_user((__force void __user *)to, from,
n - over) + over;
......@@ -331,13 +329,11 @@ static inline unsigned long copy_to_user(void __user *to,
unsigned long over;
if (access_ok(VERIFY_WRITE, to, n)) {
if (!__builtin_constant_p(n))
check_object_size(from, n, true);
return __copy_tofrom_user(to, (__force void __user *)from, n);
}
if ((unsigned long)to < TASK_SIZE) {
over = (unsigned long)to + n - TASK_SIZE;
if (!__builtin_constant_p(n))
check_object_size(from, n - over, true);
return __copy_tofrom_user(to, (__force void __user *)from,
n - over) + over;
......@@ -383,7 +379,6 @@ static inline unsigned long __copy_from_user_inatomic(void *to,
return 0;
}
if (!__builtin_constant_p(n))
check_object_size(to, n, false);
return __copy_tofrom_user((__force void __user *)to, from, n);
......@@ -412,7 +407,7 @@ static inline unsigned long __copy_to_user_inatomic(void __user *to,
if (ret == 0)
return 0;
}
if (!__builtin_constant_p(n))
check_object_size(from, n, true);
return __copy_tofrom_user(to, (__force const void __user *)from, n);
......
......@@ -249,7 +249,6 @@ 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);
return __copy_user(to, (__force void __user *) from, n);
} else
......@@ -258,7 +257,6 @@ 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);
return __copy_user(to, (__force void __user *) from, n);
}
......@@ -266,7 +264,6 @@ static inline unsigned long __copy_to_user(void __user *to, const void *from, un
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);
return __copy_user((__force void __user *) to, from, n);
} else
......
......@@ -212,7 +212,6 @@ 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);
ret = ___copy_from_user(to, from, size);
......@@ -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);
ret = ___copy_to_user(to, from, size);
if (unlikely(ret))
ret = copy_to_user_fixup(to, from, size);
......
......@@ -121,6 +121,7 @@ extern void __check_object_size(const void *ptr, unsigned long n,
static inline void check_object_size(const void *ptr, unsigned long n,
bool to_user)
{
if (!__builtin_constant_p(n))
__check_object_size(ptr, n, to_user);
}
#else
......
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