diff options
Diffstat (limited to 'arch/x86/include/asm/uaccess_32.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess_32.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/include/asm/uaccess_32.h b/arch/x86/include/asm/uaccess_32.h index 582d6aef7417..952f9e793c3e 100644 --- a/arch/x86/include/asm/uaccess_32.h +++ b/arch/x86/include/asm/uaccess_32.h @@ -191,6 +191,13 @@ unsigned long __must_check _copy_from_user(void *to, const void __user *from, unsigned long n); + +extern void copy_from_user_overflow(void) +#ifdef CONFIG_DEBUG_STACKOVERFLOW + __compiletime_warning("copy_from_user() buffer size is not provably correct") +#endif +; + static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) @@ -200,10 +207,9 @@ static inline unsigned long __must_check copy_from_user(void *to, 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 + copy_from_user_overflow(); + return ret; } |