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initial buildability of full libwolfssl.ko loadable kernel module for Linux via ./configure --enable-linuxkm && make.
This commit is contained in:
Daniel Pouzzner
29
linuxkm/Kbuild
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29
linuxkm/Kbuild
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@@ -0,0 +1,29 @@
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# libwolfssl Kbuild
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# wolfcrypto asm provokes many objtool complaints:
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# "call without frame pointer save/setup",
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# "BP used as a scratch register",
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# "indirect jump found in RETPOLINE build",
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# and "is missing an ELF size annotation"
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# see /usr/src/linux/tools/objtool/Documentation/stack-validation.txt
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OBJECT_FILES_NON_STANDARD := y
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obj-m := libwolfssl.o
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ifeq "$(WOLFSSL_OBJ_FILES)" ""
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$(error $$WOLFSSL_OBJ_FILES is unset.)
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endif
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ifeq "$(WOLFSSL_CFLAGS)" ""
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$(error $$WOLFSSL_CFLAGS is unset.)
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endif
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ifeq "$(WOLFSSL_ASFLAGS)" ""
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$(error $$WOLFSSL_ASFLAGS is unset.)
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endif
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libwolfssl-y := $(WOLFSSL_OBJ_FILES)
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ccflags-y := $(WOLFSSL_CFLAGS)
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asflags-y := $(WOLFSSL_ASFLAGS)
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38
linuxkm/Makefile
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38
linuxkm/Makefile
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all: libwolfssl.ko
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.PHONY: libwolfssl.ko
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ifndef MODULE_TOP
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MODULE_TOP=$(CURDIR)
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endif
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ifndef SRC_TOP
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SRC_TOP=$(shell dirname $(MODULE_TOP))
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endif
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ifeq "$(KROOT)" ""
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$(error $$KROOT is unset.)
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endif
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ifeq "$(AM_CFLAGS)$(CFLAGS)" ""
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$(error $$AM_CFLAGS and $$CFLAGS are both unset.)
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endif
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ifeq "$(AM_CCASFLAGS)$(CCASFLAGS)" ""
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$(error $$AM_CCASFLAGS and $$CCASFLAGS are both unset.)
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endif
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ifeq "$(src_libwolfssl_la_OBJECTS)" ""
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$(error $$src_libwolfssl_la_OBJECTS is unset.)
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endif
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WOLFSSL_CFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CFLAGS) $(CFLAGS) -Wframe-larger-than=262144
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WOLFSSL_ASFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CCASFLAGS) $(CCASFLAGS)
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WOLFSSL_OBJ_FILES=linuxkm/module_hooks.o $(patsubst %.lo, %.o, $(patsubst src/libwolfssl_la-%, src/%, $(patsubst wolfcrypt/src/src_libwolfssl_la-%, wolfcrypt/src/%, $(src_libwolfssl_la_OBJECTS))))
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export WOLFSSL_CFLAGS WOLFSSL_ASFLAGS WOLFSSL_OBJ_FILES
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libwolfssl.ko:
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@mkdir -p linuxkm src wolfcrypt/src
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@if [[ ! -h $(SRC_TOP)/Kbuild ]]; then ln -s $(MODULE_TOP)/Kbuild $(SRC_TOP)/Kbuild; fi
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make -C $(KROOT) M=$(MODULE_TOP) src=$(SRC_TOP)
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@@ -1,5 +0,0 @@
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EXTRA_PROGRAMS = automake_dummy
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automake_dummy_SOURCES = wolfssl_linuxkm.c
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module_DATA = wolfssl_linuxkm.o
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#include ../Makefile.common
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include Makefile.common
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@@ -1,20 +0,0 @@
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# Makefile.common
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moduledir = @moduledir@
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KERNEL_LOCATION=@kerneldir@
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KBUILD_VERBOSE = 1
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MOD_DEVDIR = $(PWD)
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export module_DATA
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$(module_DATA): $(automake_dummy_SOURCES)
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echo "not building kernel module yet"
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# mv Makefile Makefile.automake
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# cp $(srcdir)/../Makefile.kernel Makefile
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# CPPFLAGS="" CFLAGS="" LDFLAGS="" \
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# $(MAKE) -C $(KROOT) \
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# ARCH="$KARCH" CC="gcc" M=$(PWD) modules\
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# KBUILD_VERBOSE=$(KBUILD_VERBOSE)
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# mv Makefile.automake Makefile
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CLEANFILES = $(module_DATA) .$(module_DATA).flags $(module_DATA:.o=.mod.c) $(module_DATA:.o=.@kernelext@) *~
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43
linuxkm/module_hooks.c
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43
linuxkm/module_hooks.c
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@@ -0,0 +1,43 @@
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/* http://h-wrt.com/en/mini-how-to/autotoolsSimpleModule */
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/* src/module_hello.c */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <wolfssl/wolfcrypt/settings.h>
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#include <wolfssl/wolfcrypt/error-crypt.h>
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#include <wolfssl/ssl.h>
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static int __init wolfssl_init(void)
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{
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int ret = wolfSSL_Init();
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if (ret != WOLFSSL_SUCCESS) {
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pr_err("wolfSSL_Init() failed: %s", wc_GetErrorString(ret));
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return -ENOTRECOVERABLE;
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}
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pr_info("wolfSSL " LIBWOLFSSL_VERSION_STRING " loaded. See https://www.wolfssl.com/ for information.\n");
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pr_info("Copyright (C) 2006-2020 wolfSSL Inc. All Rights Reserved.\n");
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return 0;
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}
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module_init(wolfssl_init);
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static void __exit wolfssl_exit(void)
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{
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int ret = wolfSSL_Cleanup();
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if (ret != WOLFSSL_SUCCESS)
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pr_err("wolfSSL_Cleanup() failed: %s", wc_GetErrorString(ret));
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return;
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}
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module_exit(wolfssl_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("https://www.wolfssl.com/");
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MODULE_DESCRIPTION("libwolfssl cryptographic and protocol facilities");
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MODULE_VERSION(LIBWOLFSSL_VERSION_STRING);
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@@ -1,28 +0,0 @@
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/* http://h-wrt.com/en/mini-how-to/autotoolsSimpleModule */
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/* src/module_hello.c */
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#include <linux/init.h>
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#include <linux/module.h>
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static int __init
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hello_init(void)
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{
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printk("Hello, world!\n");
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return 0;
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}
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module_init(hello_init);
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static void __exit
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hello_exit(void)
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{
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printk("Goodbye, world!\n");
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}
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module_exit(hello_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("noname ");
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MODULE_DESCRIPTION("\"Hello, world!\" test module");
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MODULE_VERSION("printk");
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