From: "Serge E. Hallyn" <serge@hallyn.com>
To: crocket <crockabiscuit@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Linux capabilities shouldn't be lost during setuid to non-root from root or to another non-root uid from a non-root uid.
Date: Mon, 18 Apr 2011 17:02:32 -0500 [thread overview]
Message-ID: <20110418220232.GA15967@hallyn.com> (raw)
In-Reply-To: <BANLkTi=kxpFkQ86ZGd2_q+XFRm-nVWzw4g@mail.gmail.com>
Quoting crocket (crockabiscuit@gmail.com):
> I have several questions.
>
> 1) How do I set SECBIT_NO_SETUID_FIXUP?
prctl(PR_SET_SECUREBITS, SECBIT_NO_SETUID_FIXUP | SECBIT_NO_SETUID_FIXUP_LOCKED)
see capabilities(7) for details.
> 2) Is there any reason to unset SECBIT_NO_SETUID_FIXUP by default?
Yes, because it's what userspace expects. If you prefer to run in
a full POSIX capabilities environment with unprivileged root, you
can have init set SECBIT_NO_SETUID_FIXUP and SECBIT_NOROOT and
tune userspace to do the right thing, but it's not trivial.
-serge
next prev parent reply other threads:[~2011-04-18 22:02 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-17 14:05 Linux capabilities shouldn't be lost during setuid to non-root from root or to another non-root uid from a non-root uid crocket
2011-04-17 18:07 ` Serge E. Hallyn
2011-04-18 1:20 ` crocket
2011-04-18 2:05 ` Serge E. Hallyn
2011-04-18 7:21 ` crocket
2011-04-18 8:28 ` Serge E. Hallyn
2011-04-18 15:02 ` crocket
2011-04-18 22:02 ` Serge E. Hallyn [this message]
2011-04-19 1:14 ` crocket
2011-04-19 1:29 ` Serge E. Hallyn
2011-04-19 14:27 ` crocket
2011-04-19 14:35 ` Serge E. Hallyn
2011-04-20 23:51 ` crocket
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