(2010/06/03 22:10), Nick Piggin wrote:
On Thu, Jun 03, 2010 at 02:38:03PM +0200, Eric Dumazet wrote:
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 think it's been like that since first introduced. Some functions
do need to know in order to do partial copies.
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;
}
It would be unfortunate if it adds more confusion. I'd prefer to have
a sufficiently different name. memcpy_to_user/memcpy_from_user
perhaps?
Then, and memclear_user() ?
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