LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Christoph Lameter <cl@linux.com>
To: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Jonathan Corbet <corbet@lwn.net>,
	Aaron Jones <aaronmdjones@gmail.com>,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, akpm@linuxfoundation.org,
	"Andrew G. Morgan" <morgan@kernel.org>,
	Mimi Zohar <zohar@linux.vnet.ibm.com>,
	Austin S Hemmelgarn <ahferroin7@gmail.com>,
	Markku Savela <msa@moth.iki.fi>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	linux-api@vger.kernel.org,
	Michael Kerrisk <mtk.manpages@gmail.com>
Subject: Re: [PATCH] capabilities: Ambient capability set V2
Date: Fri, 6 Mar 2015 12:53:26 -0600 (CST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1503061244130.9804@gentwo.org> (raw)
In-Reply-To: <20150306163443.GA28386@mail.hallyn.com>

On Fri, 6 Mar 2015, Serge E. Hallyn wrote:

> Sorry, something about that patch-patch didn't make sense to me, but I
> need to look more closely.  My objection was that you were able to get the
> pA capabilities into pP without them being in your pI.  Your proposed
> change didn't seem like it would fix that.

Just tried to fix that. Could it be that cap_inherited is never set even
for a binary that has

christoph@fujitsu-haswell:~$ getcap ambient_test

ambient_test = cap_setpcap,cap_net_admin,cap_net_raw,cap_sys_nice+eip


I added some printks and it seems that current_cred()->cap_inherited is
not set when running ambient_test.

Index: linux/security/commoncap.c
===================================================================
--- linux.orig/security/commoncap.c     2015-03-06 11:05:10.802218196
-0600
+++ linux/security/commoncap.c  2015-03-06 12:50:38.424330679 -0600
@@ -456,6 +456,10 @@ static int get_file_caps(struct linux_bi
                        kernel_cap_t relevant_ambient = cap_intersect(
                                current_cred()->cap_ambient,
                                current_cred()->cap_inheritable);
+                       printk("task->comm %s: Amb=%x Inh=%x relevant=%x\n",
+                               current->comm, current_cred()->cap_ambient.cap[0],
+                                               current_cred()->cap_inheritable.cap[0],
+                                               relevant_ambient.cap[0]);
                        rc = 0;
                        if (!cap_isclear(relevant_ambient)) {
                                /*



Mar  6 12:42:18 fujitsu-haswell kernel: [  284.715051] task->comm ambient_test: Amb=803000 Inh=0 relevant=0



  reply	other threads:[~2015-03-06 18:53 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-26 22:14 Christoph Lameter
2015-03-01  4:44 ` Serge E. Hallyn
2015-03-02 15:43   ` Christoph Lameter
2015-03-01 23:33 ` Serge E. Hallyn
2015-03-05 15:26   ` Christoph Lameter
2015-03-05 17:13     ` Serge E. Hallyn
2015-03-05 18:41       ` Christoph Lameter
2015-03-05 23:07         ` Andy Lutomirski
2015-03-06 15:47           ` Christoph Lameter
2015-03-06 15:50       ` Christoph Lameter
2015-03-06 16:34         ` Serge E. Hallyn
2015-03-06 18:53           ` Christoph Lameter [this message]
2015-03-06 19:02             ` Andy Lutomirski
2015-03-06 20:08               ` Serge E. Hallyn
2015-03-07 15:09                 ` Christoph Lameter
2015-03-07 21:35                   ` Serge E. Hallyn
2015-03-09 12:05                     ` Christoph Lameter
2015-03-09 14:36                       ` Serge E. Hallyn
     [not found]                         ` <CALQRfL4uG2v7SJWZhN2o=ARnSNLR9JAX6MMsCCsGaAz6JcZTsA@mail.gmail.com>
2015-03-10 15:47                           ` Christoph Lameter
2015-03-07 15:06               ` Christoph Lameter
2015-03-07 21:35                 ` Serge E. Hallyn
2015-03-14 19:04 ` Pavel Machek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=alpine.DEB.2.11.1503061244130.9804@gentwo.org \
    --to=cl@linux.com \
    --cc=aaronmdjones@gmail.com \
    --cc=ahferroin7@gmail.com \
    --cc=akpm@linuxfoundation.org \
    --cc=corbet@lwn.net \
    --cc=jarkko.sakkinen@linux.intel.com \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=luto@amacapital.net \
    --cc=morgan@kernel.org \
    --cc=msa@moth.iki.fi \
    --cc=mtk.manpages@gmail.com \
    --cc=serge.hallyn@canonical.com \
    --cc=serge@hallyn.com \
    --cc=zohar@linux.vnet.ibm.com \
    --subject='Re: [PATCH] capabilities: Ambient capability set V2' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).