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

From: Vasiliy Kulikov
Date: Thu Aug 11 2011 - 13:18:24 EST

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 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?


Vasiliy Kulikov - bringing security into open computing environments
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