Re: [Scrollkeeper-devel] scrollkeeper-update segfaults or behaves weird.

[Malcolm T. <ma...@co...>]

On Mon, Apr 21, 2003 at 06:41:25AM +0200, Dag Wieers wrote:
> I'm the author of soapbox, which is a program that tricks processes ;) =
And=20
> it seems that scrollkeeper-update doesn't like this and eithers segfaul=
ts=20
> or gets involved in a recursive bug and then segfaults.
>=20
> First of all, soapbox fakes succesful completion of libc functions, so =
I=20
> can understand that this isn't in itself a bug in scrollkeeper-update
> that would occur in real world situations, but it is bugging me a lot a=
nd=20
> should obviously be fixed.
>=20
> More information about soapbox at:
>=20
> 	http://dag.wieers.com/home-made/soapbox/
>=20
>=20
> BTW These problems occur on scrollkeeper-0.3.10-7 on RH8 and on =20
> scrollkeeper-0.3.11-3 on RH9.

The symptoms you are reporting seem to indicate real problems. So thanks
for the report.

> Problem 1: segfault
> =EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=
=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=
=BF=BD=EF=BF=BD=EF=BF=BD
> If you install soapbox, and you do:
>=20
> 	soapbox scrollkeeper-update -p /var/scrollkeeper
>=20
> you trigger the bug where it segfaults.
>=20
> 	[dag@lisse ~]# soapbox scrollkeeper-update -p=20
> 	/var/scrollkeeper -o /usr/share/omf/eog/
> 	soapbox: Attempt to open64("/dev/tty", O_NONBLOCK, 0000).
> 	soapbox: Attempt to open64("/dev/tty", O_NONBLOCK, 0000).
> 	soapbox: Attempt to mkdir("/var/scrollkeeper", 0755).
> 	Segmentation fault
>=20
> Probably because mkdir("/var/scrollkeeper") seemed to have worked and t=
he=20
> following function-call isn't safe. (Beware that a directory can be gon=
e=20
> after it is created)

Segfaulting =3D=3D generally bad, I agree.

>=20
> Problem 2: recursive error
> =EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=
=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=
=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=
=BD=EF=BF=BD
> If I build programs that use scrollkeeper-update in the make install=20
> phase, it does something like:
>=20
> 	scrollkeeper-update -p /var/tmp/root-netspeed_applet-0.8/var/scrollkee=
per -o /var/tmp/root-netspeed_applet-0.8/usr/share/omf/netspeed_applet
> 	Could not create directory /var/tmp/root-netspeed_applet-0.8/var/scrol=
lkeeper/dev:/dev:/dev:/dev:/dev:/dev:/dev:/dev:/dev:dev:/dev:/dev:/dev:/d=
ev:/dev:/dev:/dev:/dev:/dev:/dev:/dev:/dev:/:/dev:/dev: : File name too l=
ong
> 	make[4]: *** [install-data-hook-omf] Segmentation fault
>=20
> And segfaults eventually. The cause of this might be due the same=20
> or a very similar problem.

I cannot think why this is happening. All those repeated /dev entries
look pretty bad. Looks like I'm going to have to download soapbox and
play around with it to try and repeat this.

Malcolm


--=20
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