Re: [PATCH][RFC] Make /proc/<pid> chmod'able

[Rene Scharfe]

Albert Cahalan wrote:
> Note that the admin hopefully does not normally run as root.
> The admin should be using a normal user account most of the
> time, to reduce the damage caused by his accidents.

Openwall and GrSecurity solved this by having a special group that can 
see everything, just like root.  E.g. we could add a proc.gid kernel 
boot option for that purpose.

> Even if the admin were not running as a normal user, it is
> expected that normal users can keep tabs on each other.
> The admin may be sleeping. Social pressure is important to
> prevent one user from sucking up all the memory and CPU time.

IANAL, but creating a user profile (who ran what when, used how many 
resources etc.) without the user's consent is illegal at least here in 
Germany.  As an admin I'd like to be able to prevent a user from even 
trying to spy on another user.

> Anything provided by traditional UNIX and BSD systems
> should be available. Users who want privacy can get their
> own computer. So, these need to work:
>
> ps -ef
> ps -el
> ps -ej
> ps axu
> ps axl
> ps axj
> ps axv
> w
> top

If with "work" you mean "show info about all users" then the patch 
becomes pointless.  The programs "work" in the sense that they do *not* 
should "cloaked" processes, which is intended. :)

OK, I understand that you need to be able to turn this feature off and I 
also don't want non-root admins to suddenly go blind.  Would adding a 
proc.gid kernel parameter and an off-switch be sufficient for you?

Thanks,
Rene
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/