drivers: KernelSU: Add KernelSU

drivers/kernelsu/Kconfig

@@ -0,0 +1,17 @@
+menu "KernelSU"
+
+config KSU
+	tristate "KernelSU function support"
+	select OVERLAY_FS
+	default y
+	help
+	Enable kernel-level root privileges on Android System.
+
+config KSU_DEBUG
+	bool "KernelSU debug mode"
+	depends on KSU
+	default n
+	help
+	Enable KernelSU debug mode
+
+endmenu

drivers/kernelsu/Makefile

@@ -0,0 +1,41 @@
+obj-y += ksu.o
+obj-y += allowlist.o
+kernelsu-objs := apk_sign.o
+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/
+# .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)
+# ksu_version: major * 10000 + git version + 200 for historical reasons
+$(eval KSU_VERSION=$(shell expr 10000 + $(KSU_GIT_VERSION) + 200))
+$(info -- KernelSU version: $(KSU_VERSION))
+ccflags-y += -DKSU_VERSION=$(KSU_VERSION)
+else # If there is no .git file, the default version will be passed.
+$(warning "KSU_GIT_VERSION not defined! It is better to make KernelSU a git submodule!")
+ccflags-y += -DKSU_VERSION=16
+endif
+
+ifndef KSU_EXPECTED_SIZE
+KSU_EXPECTED_SIZE := 0x033b
+endif
+
+ifndef KSU_EXPECTED_HASH
+KSU_EXPECTED_HASH := 0xb0b91415
+endif
+
+$(info -- KernelSU Manager signature size: $(KSU_EXPECTED_SIZE))
+$(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