From: "Serge E. Hallyn" <serue@us.ibm.com>
To: Chris Boot <bootc@bootc.net>
Cc: Axelle Apvrille <axelle_apvrille@yahoo.fr>,
Nix <nix@esperi.org.uk>, Arjan van de Ven <arjan@infradead.org>,
drepper@gmail.com, linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
disec-devel@lists.sourceforge.net
Subject: Re: [ANNOUNCE] Release Digsig 1.5: kernel module for run-timeauthentication of binaries
Date: Tue, 25 Apr 2006 15:00:13 -0500 [thread overview]
Message-ID: <20060425200013.GA7228@sergelap.austin.ibm.com> (raw)
In-Reply-To: <9C02B13C-8615-440B-A08C-AC463CC2E0AE@bootc.net>
Quoting Chris Boot (bootc@bootc.net):
> On 25 Apr 2006, at 17:11, Axelle Apvrille wrote:
>
> >- finally, note you also have choice not to sign this
> >elf loader of yours. If it isn't signed, it won't ever
> >run ;-)
>
> Wouldn't you need to sign, say, /lib/ld-linux.so? In that case, you
> can simply get it to load an execute almost anything that's ELF, even
It uses dlopen, which does mmap(PROT_EXEC), at which point digsig will
check for a signature.
If you rewrite it to not use mmap(PROT_EXEC), then the signature will
not match. If you resign it, then you presumably know what you're
doing.
I don't see the problem in this case.
> on filesystems marked noexec, if I'm not mistaken...
next prev parent reply other threads:[~2006-04-26 3:41 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-24 16:27 Makan Pourzandi (QB/EMC)
2006-04-24 16:47 ` Arjan van de Ven
2006-04-24 20:32 ` Nix
2006-04-24 20:45 ` Arjan van de Ven
2006-04-24 23:35 ` Nix
2006-04-25 6:30 ` Arjan van de Ven
2006-04-25 7:16 ` Nix
2006-04-25 16:11 ` Axelle Apvrille
2006-04-25 16:56 ` Arjan van de Ven
2006-04-25 18:57 ` Nix
2006-04-25 19:37 ` Arjan van de Ven
2006-04-25 19:52 ` Valdis.Kletnieks
2006-04-26 4:43 ` Kyle Moffett
2006-04-25 19:01 ` Chris Boot
2006-04-25 19:09 ` Valdis.Kletnieks
2006-04-25 20:00 ` Serge E. Hallyn [this message]
2006-04-28 15:33 ` Ulrich Drepper
2006-04-28 16:09 ` Serge E. Hallyn
2006-04-28 16:11 ` Arjan van de Ven
2006-04-28 16:29 ` Serge E. Hallyn
2006-04-28 17:53 ` Arjan van de Ven
2006-04-28 20:48 ` Michael Tokarev
2006-04-28 18:16 ` Christoph Hellwig
2006-04-28 19:22 ` Serge E. Hallyn
2006-04-25 13:00 ` Geert Uytterhoeven
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