Re: F_SETOWN...
Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 23 Nov 1998 13:42:57 +0000 (GMT)
> case F_SETOWN:
> err = 0;
> 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;
>
> Does no one else think that's just a little on the brain damaged side? No
> sanity checks what-so-ever in handing a filedesc to an arbitrary process
> number... no permissions check, no pid check, nothing.
Read a little further. In paticular read the send_sigio function and you'll
see the check is done at signal delivery time where it should be done,
otherwise you could set up a SIGIO on a process that then execs a setuid
process you shouldnt be able to signal
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