Date: Tue, 9 Oct 2001 00:16:17 -0400 (EDT) From: Robert Watson <rwatson@freebsd.org> To: "Georg-W. Koltermann" <gwk@sgi.com> Cc: current@freebsd.org Subject: Re: VMWare2 permission problems on -current as of Sep 26 Message-ID: <Pine.NEB.3.96L.1011008235047.784F-100000@fledge.watson.org> In-Reply-To: <lthu1xa6q6u.wl@hunter.munich.sgi.com>
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So normally vmware runs setuid root, which means that the 'real' uid and gid will be the normal user, as opposed to the root user. '0x4' on FreeBSD would constitute R_OK -- a=A0quick glance at my local Linux box demonstrates that it has the same meaning there. If you run the 'access' command with similar arguments on /home/hunter/gwk/.Xauthority, what do you get back? An interesting experiment might be to write a short program invoking access(2) with the same arguments, compiled under both ABIs, and then experimented with and without setuid-root. A glance at the linux_access() implementation looks right to me, but maybe there's something going on relating to preserving real/saved uids/gids and the process credential. Or alternatively, maybe your .Xauthority file isn't readable :-) Robert N M Watson FreeBSD Core Team, TrustedBSD Project robert@fledge.watson.org NAI Labs, Safeport Network Services On Mon, 8 Oct 2001, Georg-W. Koltermann wrote: > No, I wan't using linux_kdump, thanks for the education. >=20 > Today I've installed linux_kdump from the package on > jp.current.freebsd.org, and now I get >=20 > 1207 vmware CALL linux_access(0xbfbff759,0x4) > 1207 vmware NAMI "/compat/linux/home/hunter/gwk/.Xauthority" > 1207 vmware NAMI "/home/hunter/gwk/.Xauthority" > 1207 vmware RET linux_access -1 errno 13 Permission denied >=20 > which looks a little more meaningful (no negative errno any more, and > a linux_* syscall is listed). >=20 > Still needs debugging, which I'll attempt to do when I get a little > time. >=20 > -- > Regards, > Georg. >=20 >=20 > At Sun, 7 Oct 2001 > 19:28:35 -0400 (EDT), Robert Watson wrote: > >=20 > >=20 > > On Sun, 7 Oct 2001, Georg-W. Koltermann wrote: > >=20 > > [...] > > > I ran the vmware command through ktrace(1) (had to do that as root si= nce > > > it won't trace a SUID program for a normal user), and it does get an > > > error return from an access(2) on .Xauthority:=20 > > >=20 > > > 1207 vmware CALL access(0xbfbff759,0x4)=20 > > > 1207 vmware NAMI "/compat/linux/home/hunter/gwk/.Xauthority" > > > 1207 vmware NAMI "/home/hunter/gwk/.Xauthority" > > > 1207 vmware RET access -1 errno -13 Unknown error: -13 > > >=20 > > > It seems I am going to debug the access() call next. > >=20 > > I'm a little surprised that they're calling access(). Are you using th= e > > linux_kdump from the ports collection, btw? Otherwise the system calls > > aren't listed right, due to differences in system call number. > >=20 > > Robert N M Watson FreeBSD Core Team, TrustedBSD Project > > robert@fledge.watson.org NAI Labs, Safeport Network Services > >=20 > >=20 >=20 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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