Date: Fri, 11 Feb 2005 15:06:55 -0800 From: "David G. Lawrence" <dg@dglawrence.com> To: Kris Kennaway <kris@obsecurity.org> Cc: current@freeBSD.org Subject: Re: do_execve() finding vmspace_destroyed set under load Message-ID: <20050211230655.GL2146@opteron.dglawrence.com> In-Reply-To: <20050211225017.GA58711@xor.obsecurity.org> References: <20050130025217.GA32612@xor.obsecurity.org> <20050130075422.GL48777@opteron.dglawrence.com> <20050130093527.GA89923@xor.obsecurity.org> <20050130101403.GM48777@opteron.dglawrence.com> <20050211225017.GA58711@xor.obsecurity.org>
next in thread | previous in thread | raw e-mail | index | archive | help
> > The first thing to do is to add some kernel printf's to do_execve()
> > in each of the 'if (error)' cases to determine where the error is occuring.
> > It's probably not worth putting them in cases prior to the 'loop through
> > the list of image activators', since the vmspace isn't destroyed until
> > then.
> > Once you've done that, the cause of the problem should become obvious.
>
> It's the error branch here:
>
> for (i = 0; error == -1 && execsw[i]; ++i) {
> if (execsw[i]->ex_imgact == NULL ||
> execsw[i]->ex_imgact == img_first) {
> continue;
> }
> error = (*execsw[i]->ex_imgact)(imgp);
> }
>
> if (error) {
> if (error == -1) {
> if (textset == 0)
> imgp->vp->v_vflag &= ~VV_TEXT;
> error = ENOEXEC;
> }
> goto exec_fail_dealloc;
> }
>
> But I forgot to print the value of error..duh :-(
This tells us that the failure is coming from the image activator.
Assuming it's an ELF binary that is failing, you'll need to add some
printf's to the imgact_elf.c as well in order to narrow the problem
down further.
-DG
David G. Lawrence
President
Download Technologies, Inc. - http://www.downloadtech.com - (866) 399 8500
TeraSolutions, Inc. - http://www.terasolutions.com - (888) 346 7175
The FreeBSD Project - http://www.freebsd.org
Pave the road of life with opportunities.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050211230655.GL2146>