diff options
Diffstat (limited to 'arch/x86/include/asm/uaccess_64.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess_64.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h index db24b215fc50..ce6fec7ce38d 100644 --- a/arch/x86/include/asm/uaccess_64.h +++ b/arch/x86/include/asm/uaccess_64.h @@ -21,10 +21,27 @@ copy_user_generic(void *to, const void *from, unsigned len); __must_check unsigned long copy_to_user(void __user *to, const void *from, unsigned len); __must_check unsigned long -copy_from_user(void *to, const void __user *from, unsigned len); +_copy_from_user(void *to, const void __user *from, unsigned len); __must_check unsigned long copy_in_user(void __user *to, const void __user *from, unsigned len); +static inline unsigned long __must_check copy_from_user(void *to, + const void __user *from, + unsigned long n) +{ + int sz = __compiletime_object_size(to); + int ret = -EFAULT; + + if (likely(sz == -1 || sz >= n)) + ret = _copy_from_user(to, from, n); +#ifdef CONFIG_DEBUG_VM + else + WARN(1, "Buffer overflow detected!\n"); +#endif + return ret; +} + + static __always_inline __must_check int __copy_from_user(void *dst, const void __user *src, unsigned size) { |