Re: fcntl F_SETOWN correct?
Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 28 May 1999 17:39:09 +0100 (BST)
> filp->f_owner.pid = arg;
> filp->f_owner.uid = current->uid;
> filp->f_owner.euid = current->euid;
> if (S_ISSOCK (filp->f_dentry->d_inode->i_mode))
> err = sock_fcntl (filp, F_SETOWN, arg);
> break;
>
> It looks like no validation is done when setting the 'pid' field.
>
> Is this correct, or should it check to make sure the pid is valid, and
> owned by the current user?
You have to do the signal checks at delivery time. A pid is only a temporary
cookie. The pid may get recycled
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