From: Vivek Goyal <vgoyal@redhat.com>
To: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, ebiederm@xmission.com,
pjones@redhat.com, hpa@zytor.com, dhowells@redhat.com,
jwboyer@redhat.com, Dmitry Kasatkin <dmitry.kasatkin@intel.com>,
linux-security-module <linux-security-module@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 2/3] binfmt_elf: Verify signature of signed elf binary
Date: Wed, 16 Jan 2013 17:51:42 -0500 [thread overview]
Message-ID: <20130116225141.GC4222@redhat.com> (raw)
In-Reply-To: <1358375723.4593.206.camel@falcor1>
On Wed, Jan 16, 2013 at 05:35:23PM -0500, Mimi Zohar wrote:
> On Tue, 2013-01-15 at 16:34 -0500, Vivek Goyal wrote:
> > If a binary is signed, verify its signature. If signature is not valid, do
> > not allow execution. If binary is not signed, execution is allowed
> > unconditionally.
>
> Basically you're building the policy into the executable. Anyone can
> rebuild the executable and, without signing it, install/replace an
> existing one. How is this safe? The signature verification policy
> needs to be defined independently of the executable.
Upon signature verification this executable will also acquire a new
capability(say CAP_SIGNED). And some of the services can be allowed only
if process has that new capability. (TODO item)
So if somebody removes the signature and launches same executable, sure
it will run but it will fail to get some of the kernel services. For
example, in this case it should not be able to call sys_kexec() system
call.
Right now my goal is to not run anything which is not signed. For that
we will need a fully signed user space. And I am not sure that's going
to happen in near future, atleast for the generic case.
Thanks
Vivek
next prev parent reply other threads:[~2013-01-16 22:51 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-15 21:34 [PATCH 0/3] ELF executable signing and verification Vivek Goyal
2013-01-15 21:34 ` [PATCH 1/3] module: export couple of functions for use in process signature verification Vivek Goyal
2013-01-15 21:34 ` [PATCH 2/3] binfmt_elf: Verify signature of signed elf binary Vivek Goyal
2013-01-16 4:30 ` Eric W. Biederman
2013-01-16 4:55 ` Mimi Zohar
2013-01-16 7:10 ` Eric W. Biederman
2013-01-16 14:00 ` Mimi Zohar
2013-01-16 14:48 ` Vivek Goyal
2013-01-16 15:33 ` Mimi Zohar
2013-01-16 15:54 ` Vivek Goyal
2013-01-16 17:24 ` Mimi Zohar
2013-01-16 18:21 ` Vivek Goyal
2013-01-16 18:45 ` Mimi Zohar
2013-01-16 18:57 ` Vivek Goyal
2013-01-16 19:37 ` Mimi Zohar
2013-01-16 19:47 ` Vivek Goyal
2013-01-16 20:25 ` Mimi Zohar
2013-01-16 21:55 ` Vivek Goyal
2013-01-17 8:37 ` Elena Reshetova
2013-01-17 14:39 ` Kasatkin, Dmitry
2013-01-17 14:35 ` Kasatkin, Dmitry
2013-01-16 16:34 ` Vivek Goyal
2013-01-16 18:08 ` Mimi Zohar
2013-01-16 18:28 ` Vivek Goyal
2013-01-16 19:24 ` Mimi Zohar
2013-01-16 21:53 ` Vivek Goyal
2013-01-17 14:58 ` Kasatkin, Dmitry
2013-01-17 15:06 ` Kasatkin, Dmitry
2013-01-17 15:21 ` Vivek Goyal
2013-01-17 15:18 ` Vivek Goyal
2013-01-17 16:27 ` Kasatkin, Dmitry
2013-01-17 20:33 ` Frank Ch. Eigler
2013-01-17 20:55 ` Vivek Goyal
2013-01-17 21:46 ` Kasatkin, Dmitry
2013-01-17 21:52 ` Vivek Goyal
2013-01-20 16:36 ` Mimi Zohar
2013-01-21 16:42 ` Vivek Goyal
2013-01-21 18:30 ` Mimi Zohar
2013-01-16 22:35 ` Mimi Zohar
2013-01-16 22:51 ` Vivek Goyal [this message]
2013-01-16 23:16 ` Eric W. Biederman
2013-01-17 15:37 ` Mimi Zohar
2013-01-17 15:51 ` Vivek Goyal
2013-01-17 16:32 ` Mimi Zohar
2013-01-17 17:01 ` Kasatkin, Dmitry
2013-01-17 17:03 ` Kasatkin, Dmitry
2013-01-17 17:42 ` Vivek Goyal
2013-01-17 17:36 ` Vivek Goyal
2013-01-20 17:20 ` Mimi Zohar
2013-01-21 15:45 ` Vivek Goyal
2013-01-21 18:44 ` Mimi Zohar
2013-01-20 16:17 ` H. Peter Anvin
2013-01-20 16:55 ` Mimi Zohar
2013-01-20 17:00 ` H. Peter Anvin
2013-01-15 21:34 ` [PATCH 3/3] binfmt_elf: Do not allow exec() if signed binary has intepreter Vivek Goyal
2013-01-15 21:37 ` [PATCH 4/3] User space utility "signelf" to sign elf executable Vivek Goyal
2013-01-15 22:27 ` [PATCH 0/3] ELF executable signing and verification richard -rw- weinberger
2013-01-15 23:15 ` Vivek Goyal
2013-01-15 23:17 ` richard -rw- weinberger
2013-01-17 16:22 ` Kasatkin, Dmitry
2013-01-17 17:25 ` Vivek Goyal
2013-01-22 4:22 ` Rusty Russell
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=20130116225141.GC4222@redhat.com \
--to=vgoyal@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=dhowells@redhat.com \
--cc=dmitry.kasatkin@intel.com \
--cc=ebiederm@xmission.com \
--cc=hpa@zytor.com \
--cc=jwboyer@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=pjones@redhat.com \
--cc=zohar@linux.vnet.ibm.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).