linux-kernel - next-20190705 - problems generating certs/x509_certificate

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Date:   Fri, 05 Jul 2019 23:44:18 -0400
From:   "Valdis Klētnieks" <valdis.kletnieks@...edu>
To:     David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>
Cc:     keyrings@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: next-20190705 - problems generating certs/x509_certificate_list

This worked fine in next-20190618, but in next-20190701 I'm seeing dmesg
entries at boot:

dmesg | grep -i x.509
[    8.345699] Loading compiled-in X.509 certificates
[    8.366137] Problem loading in-kernel X.509 certificate (-13)
[    8.507348] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[    8.526556] cfg80211: Problem loading in-kernel X.509 certificate (-13)

I start debugging, and discover that certs/x509_certificate_list is a zero-length file.
I rm it, and 'make V=1 certs/system_certificates.o', which tells me:

(....)
make -f ./scripts/Makefile.headersinst obj=include/uapi
make -f ./scripts/Makefile.headersinst obj=arch/x86/include/uapi
make -f ./scripts/Makefile.build obj=certs certs/system_certificates.o
---- smoking gun alert
  scripts/extract-cert "" certs/x509_certificate_list
----
  gcc -Wp,-MD,certs/.system_certificates.o.d  -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/9/include -I./arch/x86/include -I./arch/x86/include/generated  -I./include -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/kconfig.h -D__KERNEL__ -D__ASSEMBLY__ -fno-PIE -m64 -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_SSSE3=1 -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 -DCONFIG_AS_AVX512=1 -DCONFIG_AS_SHA1_NI=1 -DCONFIG_AS_SHA256_NI=1 -Wa,-gdwarf-2 -DCC_USING_FENTRY -I.   -c -o certs/system_certificates.o certs/system_certificates.S

I go look at extract-cert.c, and sure enough, if the first parameter is a null string
it just goes and creates an empty file.

The Makefile says:

quiet_cmd_extract_certs  = EXTRACT_CERTS   $(patsubst "%",%,$(2))
      cmd_extract_certs  = scripts/extract-cert $(2) $@

and damned if I know why $(2) is "". Diffed the config files from -0618 and -0705,
not seeing anything relevant difference.

Any ideas?


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