Le jeudi 03 juin 2010 à 21:16 +0900, Takuya Yoshikawa a écrit :
> (2010/06/03 20:59), Jens Axboe wrote:
> > On 2010-06-03 12:35, Dan Carpenter wrote:
> >> copy_to_user() returns the number of bytes remaining, but we want to
> >> return -EFAULT.
> >> ret = fcntl(fd, F_SETOWN_EX, NULL);
> >> With the original code ret would be 8 here.
> >>
> >> V2: Takuya Yoshikawa pointed out a similar issue in f_getown_ex()
> >
> > Pretty basic bug, how long has this been there?
>
> IIUC, from the beginning, when these were introduced.
Maybe copy_to_user() was changed sometime to return a partial count
instead of EFAULT ?
I do think we should have a set of helper functions, instead of
spreading special EFAULT cases in one housand places...
This is really ugly.
static inline int sec_copy_to_user(arg1, arg2, arg3)
{
int res = copy_to_user(arg1, arg2, arg3);
return (res > 0) ? -EFAULT : res;
}
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