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[PATCH] Add __must_check to copy_*_user

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Following i386.

And also fix the two occurrences that caused warnings in arch/x86_64/*

Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andi Kleen 2006-09-26 10:52:39 +02:00 • committed by Andi Kleen
parent 3022d734a5
commit 95912008ba
3 changed files with 30 additions and 20 deletions
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6
arch/x86_64/ia32/ptrace32.c
View file

@ -375,8 +375,10 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
ret = -EIO; ret = -EIO;
if (!access_ok(VERIFY_READ, u, sizeof(*u))) if (!access_ok(VERIFY_READ, u, sizeof(*u)))
break; break;
/* no checking to be bug-to-bug compatible with i386 */ /* no checking to be bug-to-bug compatible with i386. */
__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)); /* but silence warning */
if (__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u)))
;
set_stopped_child_used_math(child); set_stopped_child_used_math(child);
child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask; child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
ret = 0; ret = 0;

4
include/asm-x86_64/i387.h
View file

@ -137,8 +137,8 @@ static inline int save_i387_checking(struct i387_fxsave_struct __user *fx)
#else #else
: [fx] "cdaSDb" (fx), "0" (0)); : [fx] "cdaSDb" (fx), "0" (0));
#endif #endif
if (unlikely(err)) if (unlikely(err) && __clear_user(fx, sizeof(struct i387_fxsave_struct)))
__clear_user(fx, sizeof(struct i387_fxsave_struct)); err = -EFAULT;
/* No need to clear here because the caller clears USED_MATH */ /* No need to clear here because the caller clears USED_MATH */
return err; return err;
} }

40
include/asm-x86_64/uaccess.h
View file

@ -237,14 +237,18 @@ do { \
*/ */
/* Handles exceptions in both to and from, but doesn't do access_ok */ /* Handles exceptions in both to and from, but doesn't do access_ok */
extern unsigned long copy_user_generic(void *to, const void *from, unsigned len); __must_check unsigned long
extern unsigned long copy_user_generic_dontzero(void *to, const void *from, unsigned len); copy_user_generic(void *to, const void *from, unsigned len);
extern unsigned long copy_to_user(void __user *to, const void *from, unsigned len); __must_check unsigned long
extern unsigned long copy_from_user(void *to, const void __user *from, unsigned len); copy_to_user(void __user *to, const void *from, unsigned len);
extern unsigned long copy_in_user(void __user *to, const void __user *from, unsigned len); __must_check unsigned long
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 __always_inline int __copy_from_user(void *dst, const void __user *src, unsigned size) static __always_inline __must_check
int __copy_from_user(void *dst, const void __user *src, unsigned size)
{ {
int ret = 0; int ret = 0;
if (!__builtin_constant_p(size)) if (!__builtin_constant_p(size))
@ -273,7 +277,8 @@ static __always_inline int __copy_from_user(void *dst, const void __user *src, u
} }
} }
static __always_inline int __copy_to_user(void __user *dst, const void *src, unsigned size) static __always_inline __must_check
int __copy_to_user(void __user *dst, const void *src, unsigned size)
{ {
int ret = 0; int ret = 0;
if (!__builtin_constant_p(size)) if (!__builtin_constant_p(size))
@ -304,7 +309,8 @@ static __always_inline int __copy_to_user(void __user *dst, const void *src, uns
} }
} }
static __always_inline int __copy_in_user(void __user *dst, const void __user *src, unsigned size) static __always_inline __must_check
int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
{ {
int ret = 0; int ret = 0;
if (!__builtin_constant_p(size)) if (!__builtin_constant_p(size))
@ -344,15 +350,17 @@ static __always_inline int __copy_in_user(void __user *dst, const void __user *s
} }
} }
long strncpy_from_user(char *dst, const char __user *src, long count); __must_check long
long __strncpy_from_user(char *dst, const char __user *src, long count); strncpy_from_user(char *dst, const char __user *src, long count);
long strnlen_user(const char __user *str, long n); __must_check long
long __strnlen_user(const char __user *str, long n); __strncpy_from_user(char *dst, const char __user *src, long count);
long strlen_user(const char __user *str); __must_check long strnlen_user(const char __user *str, long n);
unsigned long clear_user(void __user *mem, unsigned long len); __must_check long __strnlen_user(const char __user *str, long n);
unsigned long __clear_user(void __user *mem, unsigned long len); __must_check long strlen_user(const char __user *str);
__must_check unsigned long clear_user(void __user *mem, unsigned long len);
__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
extern long __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size); __must_check long __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size);
#define __copy_to_user_inatomic copy_user_generic #define __copy_to_user_inatomic copy_user_generic
#endif /* __X86_64_UACCESS_H */ #endif /* __X86_64_UACCESS_H */