Date: Wed, 3 May 1995 07:21:15 +0200 (MET DST) From: J Wunsch <j@uriah.heep.sax.de> To: dufault@hda.com (Peter Dufault) Cc: hackers@FreeBSD.org Subject: Re: what's in ioctl flag arg? Message-ID: <199505030521.HAA18020@uriah.heep.sax.de> In-Reply-To: <199505022207.SAA00880@hda.com> from "Peter Dufault" at May 2, 95 06:07:12 pm
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As Peter Dufault wrote:
>
> What's in the ioctl flag arg? I hope it is a copy of the
> flag passed in to the open(), but I can't find where it gets
> set up and I'm not sure if it gets translated into an "F_"
> thing instead.
Somewhere in the generic ioctl code.
> Is this how I verify that you can't write to a file in the ioctl call:
case FD_FORM:
if((flag & FWRITE) == 0)
error = EBADF; /* must be opened for writing */
...
Perhaps you'd need this, too:
case FD_STYPE: /* set drive type */
/* this is considered harmful; only allow for superuser */
if(suser(p->p_ucred, &p->p_acflag) != 0)
return EPERM;
...
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)
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