Re: [kernel-hardening] Re: [PATCH v3 -resend] move RLIMIT_NPROCcheck from set_user() to do_execve_common()

[Vasiliy Kulikov]

Hi Linus,

On Tue, Aug 09, 2011 at 12:16 +1000, NeilBrown wrote:
> On Mon, 8 Aug 2011 19:02:04 +0400 Vasiliy Kulikov <segoon@xxxxxxxxxxxx> wrote:
> 
> > The patch http://lkml.org/lkml/2003/7/13/226 introduced an RLIMIT_NPROC
> > check in set_user() to check for NPROC exceeding via setuid() and
> > similar functions.  Before the check there was a possibility to greatly
> > exceed the allowed number of processes by an unprivileged user if the
> > program relied on rlimit only.  But the check created new security
> > threat: many poorly written programs simply don't check setuid() return
> > code and believe it cannot fail if executed with root privileges.  So,
> > the check is removed in this patch because of too often privilege
> > escalations related to buggy programs.
...
> > Reviewed-by: James Morris <jmorris@xxxxxxxxx>
> Acked-by: NeilBrown <neilb@xxxxxxx>

It got 2 positive feedbacks and seems nobody has better solution.
Is it possible to see it in 3.1?

Thanks!

-- 
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
--
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/