linux-kernel - [PATCH 1/3] tomoyo: fix broken dependency on *.conf.default

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Date:   Sat,  7 Jan 2023 16:47:41 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kernel@...r.kernel.org,
        Kentaro Takeda <takedakn@...data.co.jp>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     linux-kbuild@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        James Morris <jmorris@...ei.org>,
        Michal Marek <mmarek@...e.cz>,
        Paul Moore <paul@...l-moore.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org
Subject: [PATCH 1/3] tomoyo: fix broken dependency on *.conf.default

If *.conf.default is updated, builtin-policy.h should be rebuilt,
but this does not work when compiled with O= option.

[Without this commit]

  $ touch security/tomoyo/policy/exception_policy.conf.default
  $ make O=/tmp security/tomoyo/
  make[1]: Entering directory '/tmp'
    GEN     Makefile
    CALL    /home/masahiro/ref/linux/scripts/checksyscalls.sh
    DESCEND objtool
  make[1]: Leaving directory '/tmp'

[With this commit]

  $ touch security/tomoyo/policy/exception_policy.conf.default
  $ make O=/tmp security/tomoyo/
  make[1]: Entering directory '/tmp'
    GEN     Makefile
    CALL    /home/masahiro/ref/linux/scripts/checksyscalls.sh
    DESCEND objtool
    POLICY  security/tomoyo/builtin-policy.h
    CC      security/tomoyo/common.o
    AR      security/tomoyo/built-in.a
  make[1]: Leaving directory '/tmp'

$(srctree)/ is essential because $(wildcard ) does not follow VPATH.

Fixes: f02dee2d148b ("tomoyo: Do not generate empty policy files")
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 security/tomoyo/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/tomoyo/Makefile b/security/tomoyo/Makefile
index cca5a3012fee..221eaadffb09 100644
--- a/security/tomoyo/Makefile
+++ b/security/tomoyo/Makefile
@@ -10,7 +10,7 @@ endef
 quiet_cmd_policy  = POLICY  $@
       cmd_policy  = ($(call do_policy,profile); $(call do_policy,exception_policy); $(call do_policy,domain_policy); $(call do_policy,manager); $(call do_policy,stat)) >$@
 
-$(obj)/builtin-policy.h: $(wildcard $(obj)/policy/*.conf $(src)/policy/*.conf.default) FORCE
+$(obj)/builtin-policy.h: $(wildcard $(obj)/policy/*.conf $(srctree)/$(src)/policy/*.conf.default) FORCE
 	$(call if_changed,policy)
 
 $(obj)/common.o: $(obj)/builtin-policy.h
-- 
2.34.1