Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755492AbbHLKXd (ORCPT ); Wed, 12 Aug 2015 06:23:33 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:36127 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752048AbbHLKXa (ORCPT ); Wed, 12 Aug 2015 06:23:30 -0400 Message-ID: <1439375000.3100.70.camel@infradead.org> Subject: Re: [GIT PULL] MODSIGN: Use PKCS#7 for module signatures [ver #7a] From: David Woodhouse To: James Morris Cc: David Howells , mcgrof@gmail.com, Mimi Zohar , linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Date: Wed, 12 Aug 2015 11:23:20 +0100 In-Reply-To: References: <15181.1439323425@warthog.procyon.org.uk> <1439363265.3100.30.camel@infradead.org> <1439370753.3100.58.camel@infradead.org> <1439373041.3100.64.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-cFnna58FfbcjNweHr2eY" X-Mailer: Evolution 3.16.4 (3.16.4-2.fc22) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11027 Lines: 198 --=-cFnna58FfbcjNweHr2eY Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2015-08-12 at 20:08 +1000, James Morris wrote: > make-3.81-20.el6.x86_64 >=20 > The machine is not accessible, sorry. No matter. I have a CentOS 6 VM in which I can attempt to reproduce. > Where is MODULE_SIG_KEY_FILENAME assigned? At about line 243: $(eval $(call config_filename,MODULE_SIG_KEY)) Or, more to the point, somewhere in here... you may now understand why I made a new jug of coffee. I had torture-tested this with fairly much every pathology I could think of. And you've managed to break it with the *default* case. Congratulations. You just made me cry. ###########################################################################= #### # # When a Kconfig string contains a filename, it is suitable for # passing to shell commands. It is surrounded by double-quotes, and # any double-quotes or backslashes within it are escaped by # backslashes. # # This is no use for dependencies or $(wildcard). We need to strip the # surrounding quotes and the escaping from quotes and backslashes, and # we *do* need to escape any spaces in the string. So, for example: # # Usage: $(eval $(call config_filename,FOO)) # # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, # transformed as described above to be suitable for use within the # makefile. # # Also, if the filename is a relative filename and exists in the source # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to # be prefixed to *both* command invocation and dependencies. # # Note: We also print the filenames in the quiet_cmd_foo text, and # perhaps ought to have a version specially escaped for that purpose. # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good # enough. It'll strip the quotes in the common case where there's no # space and it's a simple filename, and it'll retain the quotes when # there's a space. There are some esoteric cases in which it'll print # the wrong thing, but we don't really care. The actual dependencies # and commands *do* get it right, with various combinations of single # and double quotes, backslashes and spaces in the filenames. # ###########################################################################= #### # quote :=3D $(firstword " ") space :=3D space +=3D space_escape :=3D %%%SPACE%%% # define config_filename =3D ifneq ($$(CONFIG_$(1)),"") $(1)_FILENAME :=3D $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(= space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_esca= pe),$$(CONFIG_$(1))))))) ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(= 1)_FILENAME))) else ifeq ($$(wildcard $$($(1)_FILENAME)),) ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) $(1)_SRCPREFIX :=3D $(srctree)/ endif endif endif endif endef --=20 dwmw2 --=-cFnna58FfbcjNweHr2eY Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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