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Date:   Mon, 13 Jun 2022 20:06:04 +0200
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To:     Masahiro Yamada <masahiroy@kernel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        David Howells <dhowells@redhat.com>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        David Woodhouse <dwmw2@infradead.org>,
        keyrings@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Eric Snowberg <eric.snowberg@oracle.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Tyler Hicks <tyhicks@linux.microsoft.com>
References: <20220611172233.1494073-1-masahiroy@kernel.org>
 <20220611172233.1494073-2-masahiroy@kernel.org>
 <58a20890-557e-f31c-ed59-7e256445a26c@digikod.net>
 <CAK7LNAQ3p2XiLO7tJSJ9JWnqRomCwjYeQy-Z3j0m904Yn6Av_g@mail.gmail.com>
From:   =?UTF-8?Q?Micka=c3=abl_Sala=c3=bcn?= <mic@digikod.net>
Subject: Re: [PATCH 2/4] certs: fix and refactor
 CONFIG_SYSTEM_BLACKLIST_HASH_LIST build
In-Reply-To: <CAK7LNAQ3p2XiLO7tJSJ9JWnqRomCwjYeQy-Z3j0m904Yn6Av_g@mail.gmail.com>
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On 13/06/2022 16:55, Masahiro Yamada wrote:
> On Mon, Jun 13, 2022 at 9:34 PM Mickaël Salaün <mic@digikod.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@kernel.org>
>>
>> Reviewed-by: Mickaël Salaün <mic@linux.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.

blacklist_hashes_checked is the file you replaced with 
blacklist_hash_list, and is then not used in any Makefile anymore. There 
is then no timestamp issue. I just wanted to mention that it is normal 
that a git status will show it on build directories also used as source 
directories that were already using such feature.


> 
> 
> 
>> 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