Re: "logical unit communication failure" c2scan NEC ND-4550A 1.07
> The setuid privileges demand w-rights ?
No, these are independent. Many OSs in fact do not check permissions for
privileged users at all, you can read files even after chmod 0.
> I mean, that is an interesting sneak, but isn't it rather
> related to mount -o user,exec,suid ?
Yes, but these options are default.
> Device nodes ... uh oh ... do you mean this :
> a mknod, a chmod with lax permissions, burned to CD,
> CD mounted, cat /dev/zero > /cdrom/my_dev_hda_backdoor
Exactly. It's not a sure way into the system, but something that has to
be taken into account given automount, submount, HAL, whatever.
> w-permission to setuid-cdrecord should be restricted to
> root, of course.
> Since years, i trust Joerg's ability to defend that setuid
There have been problems in the past,
and I haven't audited the code.