Commit d7ec435f (X.509: Fix certificate gathering) fixed the issue of
changing .x509.list, but in the CONFIG_MODULE_SIG=y case, it assumed
that $(objtree) is an absolute path. Commit 7e1c0477 (kbuild: Use
relative path for $(objtree)) broke this assumption and we get
uncecessary rebuilds again. Instead of prepending the absolute path and
stripping it again, just check if $(srctree) and $(objtree) are
different directories and add $(srctree)/*.x509 only in such case.
Fixes: 7e1c047 (kbuild: Use relative path for $(objtree))
Cc: [email protected]
Signed-off-by: Michal Marek <[email protected]>
---
kernel/Makefile | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/kernel/Makefile b/kernel/Makefile
index dc5c775..7cf32cf 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -123,11 +123,12 @@ $(obj)/config_data.h: $(obj)/config_data.gz FORCE
#
###############################################################################
ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
-X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
-X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += $(objtree)/signing_key.x509
-X509_CERTIFICATES-raw := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
- $(or $(realpath $(CERT)),$(CERT))))
-X509_CERTIFICATES := $(subst $(realpath $(objtree))/,,$(X509_CERTIFICATES-raw))
+X509_CERTIFICATES-y := $(wildcard *.x509)
+ifneq ($(objtree),$(srctree))
+X509_CERTIFICATES-y += $(wildcard $(srctree)/*.x509)
+endif
+X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
+X509_CERTIFICATES := $(sort $(X509_CERTIFICATES-y))
ifeq ($(X509_CERTIFICATES),)
$(warning *** No X.509 certificates found ***)
--
1.8.4.5
Michal Marek <[email protected]> wrote:
> +X509_CERTIFICATES-y := $(wildcard *.x509)
> +ifneq ($(objtree),$(srctree))
> +X509_CERTIFICATES-y += $(wildcard $(srctree)/*.x509)
> +endif
> +X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
> +X509_CERTIFICATES := $(sort $(X509_CERTIFICATES-y))
What will happen if there's a "signing_key.x509" in the source tree when O= is
used?
David
On 2015-02-19 13:26, David Howells wrote:
> Michal Marek <[email protected]> wrote:
>
>> +X509_CERTIFICATES-y := $(wildcard *.x509)
>> +ifneq ($(objtree),$(srctree))
>> +X509_CERTIFICATES-y += $(wildcard $(srctree)/*.x509)
>> +endif
>> +X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
>> +X509_CERTIFICATES := $(sort $(X509_CERTIFICATES-y))
>
> What will happen if there's a "signing_key.x509" in the source tree when O= is
> used?
It will fail. So the patch needs more work, thanks for the review.
Michal
On Fri, Feb 20, 2015 at 02:52:14PM +0100, Michal Marek wrote:
> On 2015-02-19 13:26, David Howells wrote:
> > Michal Marek <[email protected]> wrote:
> >
> >> +X509_CERTIFICATES-y := $(wildcard *.x509)
> >> +ifneq ($(objtree),$(srctree))
> >> +X509_CERTIFICATES-y += $(wildcard $(srctree)/*.x509)
> >> +endif
> >> +X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
> >> +X509_CERTIFICATES := $(sort $(X509_CERTIFICATES-y))
> >
> > What will happen if there's a "signing_key.x509" in the source tree when O= is
> > used?
>
> It will fail. So the patch needs more work, thanks for the review.
OK, this works for me and I finally understand why :). The problem is
that whatever file make sees (as a target or dependency) first, it will
prefer it for the purpose of VPATH search, so the right signing_key.x509
must come first. Unfortunately, using 'vpath %.x509' does not do the
trick, because this merely says not to use any special VPATH for files
matching this pattern, but it does not avoid the global VPATH.
>From 1774298ef0fa770cd7e8810ed57ceb4e8a7c5def Mon Sep 17 00:00:00 2001
From: Michal Marek <[email protected]>
Date: Wed, 8 Oct 2014 13:15:28 +0200
Subject: [PATCH] X.509: Fix certificate gathering again
Commit d7ec435f (X.509: Fix certificate gathering) fixed the issue of
changing .x509.list, but in the CONFIG_MODULE_SIG=y case, it assumed
that $(objtree) was an absolute path. Commit 7e1c0477 (kbuild: Use
relative path for $(objtree)) broke this assumption and we get
uncecessary rebuilds again, due to ./signing_key.x509 changing to
signing_key.x509. Instead of prepending the absolute path and
stripping it again, just check if $(srctree) and $(objtree) are
different directories and add $(srctree)/*.x509 only in such case.
However, such fix causes a different issue, namely that a potential
$(srctree)/signing_key.x509 appears before the to-be-generated
signing_key.x509 in the sorted list, and make remembers this file for
the purpose of VPATH search. It worked previously, because
./signing_key.x509 sorts before any absolute path. Solve this by sorting
the $(objtree) and $(srctree) files separately, to ensure that
signing_key.x509 appears before anything from $(srctree).
Signed-off-by: Michal Marek <[email protected]>
---
kernel/Makefile | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/kernel/Makefile b/kernel/Makefile
index 1408b33..792e043 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -117,17 +117,18 @@ $(obj)/config_data.h: $(obj)/config_data.gz FORCE
# boot.
#
# We look in the source root and the build root for all files whose name ends
-# in ".x509". Unfortunately, this will generate duplicate filenames, so we
-# have make canonicalise the pathnames and then sort them to discard the
-# duplicates.
+# in ".x509". We put the $(objtree) certificates before those from $(srctree),
+# so that a potential signing_key.x509 file from $(srctree) does not take
+# precedence.
#
###############################################################################
ifeq ($(CONFIG_SYSTEM_TRUSTED_KEYRING),y)
-X509_CERTIFICATES-y := $(wildcard *.x509) $(wildcard $(srctree)/*.x509)
-X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += $(objtree)/signing_key.x509
-X509_CERTIFICATES-raw := $(sort $(foreach CERT,$(X509_CERTIFICATES-y), \
- $(or $(realpath $(CERT)),$(CERT))))
-X509_CERTIFICATES := $(subst $(realpath $(objtree))/,,$(X509_CERTIFICATES-raw))
+X509_CERTIFICATES-y := $(wildcard *.x509)
+X509_CERTIFICATES-$(CONFIG_MODULE_SIG) += signing_key.x509
+X509_CERTIFICATES := $(sort $(X509_CERTIFICATES-y))
+ifneq ($(objtree),$(srctree))
+X509_CERTIFICATES += $(sort $(wildcard $(srctree)/*.x509))
+endif
ifeq ($(X509_CERTIFICATES),)
$(warning *** No X.509 certificates found ***)
--
1.9.2