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usercopy: fold builtin_const check into inline function

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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 <keescook@chromium.org>
This commit is contained in:
Kees Cook 2016-08-31 16:04:21 -07:00
parent e6971009a9
commit 81409e9e28
5 changed files with 19 additions and 31 deletions
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9
arch/sparc/include/asm/uaccess_32.h
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@ -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;