Makefile changes for building as a module

kernel/Kconfig

@@ -14,4 +14,11 @@ config KSU_DEBUG
 	help
 	Enable KernelSU debug mode
 
+config KSU_MODULE
+	bool "Build KernelSU as a module"
+	depends on KSU
+	default n
+	help
+	Build KernelSU as a loadable kernel module
+
 endmenu

kernel/Makefile

@@ -1,17 +1,27 @@
-obj-y += ksu.o
-obj-y += allowlist.o
-kernelsu-objs := apk_sign.o
+kernelsu-objs := ksu.o
+kernelsu-objs += allowlist.o
+kernelsu-objs += apk_sign.o
+kernelsu-objs += module_api.o
+kernelsu-objs += sucompat.o
+kernelsu-objs += uid_observer.o
+kernelsu-objs += manager.o
+kernelsu-objs += core_hook.o
+kernelsu-objs += ksud.o
+kernelsu-objs += embed_ksud.o
+kernelsu-objs += kernel_compat.o
+
+kernelsu-objs += selinux/selinux.o
+kernelsu-objs += selinux/sepolicy.o
+kernelsu-objs += selinux/rules.o
+ccflags-y += -I$(srctree)/security/selinux -I$(srctree)/security/selinux/include
+ccflags-y += -I$(objtree)/security/selinux -include $(srctree)/include/uapi/asm-generic/errno.h
+
+ifndef KSU_MODULE
 obj-y += kernelsu.o
-obj-y += module_api.o
-obj-y += sucompat.o
-obj-y += uid_observer.o
-obj-y += manager.o
-obj-y += core_hook.o
-obj-y += ksud.o
-obj-y += embed_ksud.o
-obj-y += kernel_compat.o
-
-obj-y += selinux/
+else
+obj-m += kernelsu.o
+endif
+
 # .git is a text file while the module is imported by 'git submodule add'.
 ifeq ($(shell test -e $(srctree)/$(src)/../.git; echo $$?),0)
 KSU_GIT_VERSION := $(shell cd $(srctree)/$(src); /usr/bin/env PATH="$$PATH":/usr/bin:/usr/local/bin git rev-list --count HEAD)
@@ -24,6 +34,14 @@ $(warning "KSU_GIT_VERSION not defined! It is better to make KernelSU a git subm
 ccflags-y += -DKSU_VERSION=16
 endif
 
+ifeq ($(shell grep -q " current_sid(void)" $(srctree)/security/selinux/include/objsec.h; echo $$?),0)
+ccflags-y += -DKSU_COMPAT_HAS_CURRENT_SID
+endif
+
+ifeq ($(shell grep -q "struct selinux_state " $(srctree)/security/selinux/include/security.h; echo $$?),0)
+ccflags-y += -DKSU_COMPAT_HAS_SELINUX_STATE
+endif
+
 ifndef KSU_EXPECTED_SIZE
 KSU_EXPECTED_SIZE := 0x033b
 endif
@@ -42,5 +60,6 @@ $(info -- KernelSU Manager signature hash: $(KSU_EXPECTED_HASH))
 
 ccflags-y += -DEXPECTED_SIZE=$(KSU_EXPECTED_SIZE)
 ccflags-y += -DEXPECTED_HASH=\"$(KSU_EXPECTED_HASH)\"
+
 ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat
-ccflags-y += -Wno-declaration-after-statement
+ccflags-y += -Wno-declaration-after-statement -Wno-unused-function