[PATCH v2] buildsystem: add CONFIG_SECCOMP

[Florian Eckert]

Until now, this feature was switched on via the kernel configuration
option KERNEL_SECCOMP.

The follwing change a7f794cd2aa104fdbd4c6e38f9b76373bf9b96e1 now requires that
the package procd-seccomp must also enabled for buildinmg.

However, this is not the case we have no dependency and the imagebuilder
cannot build the image, because of the implicit package selection.

This change adds a new configuration option CONFIG_SECCOMP.
The new option  has the same behaviour as the configuration
option CONFIG_SELINUX.

If the CONFIG_SECCOMP is selected then the package procd-seccomp and
KERNEL_SECCOMP is enabled for this build.

Signed-off-by: Florian Eckert <fe at dev.tdt.de>
---
v2: Enable CONFIG_SECCOMP by default
 config/Config-build.in        | 12 ++++++++++++
 include/target.mk             |  2 +-
 package/system/procd/Makefile |  3 +--
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/config/Config-build.in b/config/Config-build.in
index f0e1aaa695..ca6f513450 100644
--- a/config/Config-build.in
+++ b/config/Config-build.in
@@ -386,4 +386,16 @@ menu "Global build settings"
 
 	endchoice
 
+	config SECCOMP
+		bool "Enable SECCOMP"
+		select KERNEL_SECCOMP
+		select PACKAGE_procd-seccomp
+		depends on (aarch64 || arm || armeb || mips || mipsel || i386 || powerpc || x86_64)
+		depends on !TARGET_uml
+		default y
+		help
+		  This option enables seccomp kernel features to safely
+		  execute untrusted bytecode and selects the seccomp-variants
+		  of procd
+
 endmenu
diff --git a/include/target.mk b/include/target.mk
index 03192d3ebe..60760bf602 100644
--- a/include/target.mk
+++ b/include/target.mk
@@ -39,7 +39,7 @@ DEFAULT_PACKAGES+=procd-ujail
 endif
 
 # include seccomp ld-preload hooks if kernel supports it
-ifneq ($(CONFIG_KERNEL_SECCOMP),)
+ifneq ($(CONFIG_SECCOMP),)
 DEFAULT_PACKAGES+=procd-seccomp
 endif
 
diff --git a/package/system/procd/Makefile b/package/system/procd/Makefile
index 6f506423f8..4c76045062 100644
--- a/package/system/procd/Makefile
+++ b/package/system/procd/Makefile
@@ -82,8 +82,7 @@ endef
 define Package/procd-seccomp
   SECTION:=base
   CATEGORY:=Base system
-  DEPENDS:=@(aarch64||arm||armeb||mips||mipsel||i386||powerpc||x86_64) @!TARGET_uml \
-	  @KERNEL_SECCOMP +libubox +libblobmsg-json
+  DEPENDS:=@SECCOMP +libubox +libblobmsg-json
   TITLE:=OpenWrt process seccomp helper + utrace
 endef
 
-- 
2.20.1