linux-kernel - Re: [PATCH 2/4] certs: fix and refactor CONFIG_SYSTEM_BLACKLIST_HASH

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Date:   Mon, 13 Jun 2022 23:55:21 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Mickaël Salaün <mic@...ikod.net>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        keyrings@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Eric Snowberg <eric.snowberg@...cle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>
Subject: Re: [PATCH 2/4] certs: fix and refactor CONFIG_SYSTEM_BLACKLIST_HASH_LIST
 build

On Mon, Jun 13, 2022 at 9:34 PM Mickaël Salaün <mic@...ikod.net> wrote:
>
>
>
> On 11/06/2022 19:22, Masahiro Yamada wrote:
> > Commit addf466389d9 ("certs: Check that builtin blacklist hashes are
> > valid") was applied 8 months after the submission.
> >
> > In the meantime, the base code had been removed by commit b8c96a6b466c
> > ("certs: simplify $(srctree)/ handling and remove config_filename
> > macro").
> >
> > Fix the Makefile.
> >
> > Create a local copy of $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST). It is
> > included from certs/blacklist_hashes.c and also works as a timestamp.
> >
> > Send error messages from check-blacklist-hashes.awk to stderr instead
> > of stdout.
> >
> > Fixes: addf466389d9 ("certs: Check that builtin blacklist hashes are valid")
> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
>
> Reviewed-by: Mickaël Salaün <mic@...ux.microsoft.com>
>
> As a side note, it may let an orphan certs/blacklist_hashes_checked file
> but we can't really do something about that and it's OK.


GNU Make uses timestamps of files for dependency tracking,
so Kbuild keeps all intermediate files.

Keeping certs/blacklist_hashes_checked
is the right thing to do.



> Thanks!
>
> > ---
> >
> >   certs/.gitignore         |  2 +-
> >   certs/Makefile           | 20 ++++++++++----------
> >   certs/blacklist_hashes.c |  2 +-
> >   3 files changed, 12 insertions(+), 12 deletions(-)
> >
> > diff --git a/certs/.gitignore b/certs/.gitignore
> > index 56637aceaf81..cec5465f31c1 100644
> > --- a/certs/.gitignore
> > +++ b/certs/.gitignore
> > @@ -1,5 +1,5 @@
> >   # SPDX-License-Identifier: GPL-2.0-only
> > -/blacklist_hashes_checked
> > +/blacklist_hash_list
> >   /extract-cert
> >   /x509_certificate_list
> >   /x509_revocation_list
> > diff --git a/certs/Makefile b/certs/Makefile
> > index cb1a9da3fc58..a8d628fd5f7b 100644
> > --- a/certs/Makefile
> > +++ b/certs/Makefile
> > @@ -7,22 +7,22 @@ obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o c
> >   obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
> >   obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
> >   ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),)
> > -quiet_cmd_check_blacklist_hashes = CHECK   $(patsubst "%",%,$(2))
> > -      cmd_check_blacklist_hashes = $(AWK) -f $(srctree)/scripts/check-blacklist-hashes.awk $(2); touch $@
> >
> > -$(eval $(call config_filename,SYSTEM_BLACKLIST_HASH_LIST))
> > +$(obj)/blacklist_hashes.o: $(obj)/blacklist_hash_list
> > +CFLAGS_blacklist_hashes.o := -I $(obj)
> >
> > -$(obj)/blacklist_hashes.o: $(obj)/blacklist_hashes_checked
> > +quiet_cmd_check_and_copy_blacklist_hash_list = GEN     $@
> > +      cmd_check_and_copy_blacklist_hash_list = \
> > +     $(AWK) -f $(srctree)/scripts/check-blacklist-hashes.awk $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) >&2; \
> > +     cat $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) > $@
> >
> > -CFLAGS_blacklist_hashes.o += -I$(srctree)
> > -
> > -targets += blacklist_hashes_checked
> > -$(obj)/blacklist_hashes_checked: $(SYSTEM_BLACKLIST_HASH_LIST_SRCPREFIX)$(SYSTEM_BLACKLIST_HASH_LIST_FILENAME) scripts/check-blacklist-hashes.awk FORCE
> > -     $(call if_changed,check_blacklist_hashes,$(SYSTEM_BLACKLIST_HASH_LIST_SRCPREFIX)$(CONFIG_SYSTEM_BLACKLIST_HASH_LIST))
> > +$(obj)/blacklist_hash_list: $(CONFIG_SYSTEM_BLACKLIST_HASH_LIST) FORCE
> > +     $(call if_changed,check_and_copy_blacklist_hash_list)
> >   obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
> >   else
> >   obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
> >   endif
> > +targets += blacklist_hash_list
> >
> >   quiet_cmd_extract_certs  = CERT    $@
> >         cmd_extract_certs  = $(obj)/extract-cert $(extract-cert-in) $@
> > @@ -33,7 +33,7 @@ $(obj)/system_certificates.o: $(obj)/x509_certificate_list
> >   $(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE
> >       $(call if_changed,extract_certs)
> >
> > -targets += x509_certificate_list blacklist_hashes_checked
> > +targets += x509_certificate_list
> >
> >   # If module signing is requested, say by allyesconfig, but a key has not been
> >   # supplied, then one will need to be generated to make sure the build does not
> > diff --git a/certs/blacklist_hashes.c b/certs/blacklist_hashes.c
> > index d5961aa3d338..86d66fe11348 100644
> > --- a/certs/blacklist_hashes.c
> > +++ b/certs/blacklist_hashes.c
> > @@ -2,6 +2,6 @@
> >   #include "blacklist.h"
> >
> >   const char __initconst *const blacklist_hashes[] = {
> > -#include CONFIG_SYSTEM_BLACKLIST_HASH_LIST
> > +#include "blacklist_hash_list"
> >       , NULL
> >   };



--
Best Regards
Masahiro Yamada