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initial buildability of full libwolfssl.ko loadable kernel module for Linux via ./configure --enable-linuxkm && make.

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This commit is contained in:
Daniel Pouzzner
2020-08-18 14:17:44 -05:00
parent 0e480d1a14
commit 1aa15632ce
10 changed files with 140 additions and 71 deletions
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9
.gitignore vendored
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@ -229,6 +229,15 @@ IDE/MDK-ARM/LPC43xx/LPC43xx/
*.gcno
*.gcda
*.gcov
!linuxkm/Makefile
/Kbuild
linuxkm/*.ko
linuxkm/Module.symvers
linuxkm/built-in.a
linuxkm/modules.order
linuxkm/wolfcrypt
linuxkm/libwolfssl.mod
linuxkm/libwolfssl.mod.c
# MPLAB Generated Files (OS X)
mcapi/wolfcrypt_mcapi.X/nbproject/Makefile-*

3
Makefile.am
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@ -195,7 +195,8 @@ endif
include scripts/include.am
if BUILD_LINUXKM
SUBDIRS = . linuxkm
export KROOT KARCH AM_CFLAGS CFLAGS AM_CCASFLAGS CCASFLAGS src_libwolfssl_la_OBJECTS
SUBDIRS = linuxkm
endif
if USE_VALGRIND

13
configure.ac
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@ -3381,16 +3381,18 @@ then
[AS_HELP_STRING([--with-linux-source=PATH],[PATH to root of Linux kernel build tree])],
[KROOT=$withval],
[KROOT=$DEFAULT_KROOT])
AC_SUBST([KROOT])
AC_DEFAULT_KERNEL_ARCH
AC_ARG_WITH([linux-arch],
[AS_HELP_STRING([--with-linux-arch=arch],[built arch (SRCARCH) of Linux kernel build tree])],
[KARCH=$withval],
[KARCH=$DEFAULT_KARCH])
AC_SUBST([KARCH])
AC_DEFINE_KERNEL_KFLAGS
AM_CPPFLAGS="$KFLAGS $AM_CPPFLAGS"
# AC_DEFINE_KERNEL_KFLAGS
#
# AM_CPPFLAGS="$KFLAGS $AM_CPPFLAGS"
fi
@ -5413,7 +5415,7 @@ AC_SUBST([LIB_STATIC_ADD])
# FINAL
AC_CONFIG_FILES([stamp-h], [echo timestamp > stamp-h])
AC_CONFIG_FILES([Makefile wolfssl/version.h wolfssl/options.h cyassl/options.h support/wolfssl.pc rpm/spec linuxkm/Makefile])
AC_CONFIG_FILES([Makefile wolfssl/version.h wolfssl/options.h cyassl/options.h support/wolfssl.pc rpm/spec])
AX_CREATE_GENERIC_CONFIG
AX_AM_JOBSERVER([yes])
@ -5665,8 +5667,7 @@ echo " * Small Stack: $ENABLED_SMALL_STACK"
echo " * Linux Kernel Module: $ENABLED_LINUXKM"
test "$ENABLED_LINUXKM" = "yes" && \
echo " * Linux Kernel Build Root: $KROOT" && \
echo " * Linux Kernel Build Arch: $KARCH" && \
echo " * Linux Kernel Build Flags: $KFLAGS"
echo " * Linux Kernel Build Arch: $KARCH"
echo " * valgrind unit tests: $ENABLED_VALGRIND"
echo " * LIBZ: $ENABLED_LIBZ"
echo " * Examples: $ENABLED_EXAMPLES"

29
linuxkm/Kbuild Normal file
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@ -0,0 +1,29 @@
# libwolfssl Kbuild
# wolfcrypto asm provokes many objtool complaints:
# "call without frame pointer save/setup",
# "BP used as a scratch register",
# "indirect jump found in RETPOLINE build",
# and "is missing an ELF size annotation"
# see /usr/src/linux/tools/objtool/Documentation/stack-validation.txt
OBJECT_FILES_NON_STANDARD := y
obj-m := libwolfssl.o
ifeq "$(WOLFSSL_OBJ_FILES)" ""
$(error $$WOLFSSL_OBJ_FILES is unset.)
endif
ifeq "$(WOLFSSL_CFLAGS)" ""
$(error $$WOLFSSL_CFLAGS is unset.)
endif
ifeq "$(WOLFSSL_ASFLAGS)" ""
$(error $$WOLFSSL_ASFLAGS is unset.)
endif
libwolfssl-y := $(WOLFSSL_OBJ_FILES)
ccflags-y := $(WOLFSSL_CFLAGS)
asflags-y := $(WOLFSSL_ASFLAGS)

38
linuxkm/Makefile Normal file
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@ -0,0 +1,38 @@
all: libwolfssl.ko
.PHONY: libwolfssl.ko
ifndef MODULE_TOP
MODULE_TOP=$(CURDIR)
endif
ifndef SRC_TOP
SRC_TOP=$(shell dirname $(MODULE_TOP))
endif
ifeq "$(KROOT)" ""
$(error $$KROOT is unset.)
endif
ifeq "$(AM_CFLAGS)$(CFLAGS)" ""
$(error $$AM_CFLAGS and $$CFLAGS are both unset.)
endif
ifeq "$(AM_CCASFLAGS)$(CCASFLAGS)" ""
$(error $$AM_CCASFLAGS and $$CCASFLAGS are both unset.)
endif
ifeq "$(src_libwolfssl_la_OBJECTS)" ""
$(error $$src_libwolfssl_la_OBJECTS is unset.)
endif
WOLFSSL_CFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CFLAGS) $(CFLAGS) -Wframe-larger-than=262144
WOLFSSL_ASFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CCASFLAGS) $(CCASFLAGS)
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))))
export WOLFSSL_CFLAGS WOLFSSL_ASFLAGS WOLFSSL_OBJ_FILES
libwolfssl.ko:
@mkdir -p linuxkm src wolfcrypt/src
@if [[ ! -h $(SRC_TOP)/Kbuild ]]; then ln -s $(MODULE_TOP)/Kbuild $(SRC_TOP)/Kbuild; fi
make -C $(KROOT) M=$(MODULE_TOP) src=$(SRC_TOP)

5
linuxkm/Makefile.am
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@ -1,5 +0,0 @@
EXTRA_PROGRAMS = automake_dummy
automake_dummy_SOURCES = wolfssl_linuxkm.c
module_DATA = wolfssl_linuxkm.o
#include ../Makefile.common
include Makefile.common

20
linuxkm/Makefile.common
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@ -1,20 +0,0 @@
# Makefile.common
moduledir = @moduledir@
KERNEL_LOCATION=@kerneldir@
KBUILD_VERBOSE = 1
MOD_DEVDIR = $(PWD)
export module_DATA
$(module_DATA): $(automake_dummy_SOURCES)
echo "not building kernel module yet"
# mv Makefile Makefile.automake
# cp $(srcdir)/../Makefile.kernel Makefile
# CPPFLAGS="" CFLAGS="" LDFLAGS="" \
# $(MAKE) -C $(KROOT) \
# ARCH="$KARCH" CC="gcc" M=$(PWD) modules\
# KBUILD_VERBOSE=$(KBUILD_VERBOSE)
# mv Makefile.automake Makefile
CLEANFILES = $(module_DATA) .$(module_DATA).flags $(module_DATA:.o=.mod.c) $(module_DATA:.o=.@kernelext@) *~

43
linuxkm/module_hooks.c Normal file
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@ -0,0 +1,43 @@
/* http://h-wrt.com/en/mini-how-to/autotoolsSimpleModule */
/* src/module_hello.c */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <wolfssl/wolfcrypt/settings.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#include <wolfssl/ssl.h>
static int __init wolfssl_init(void)
{
int ret = wolfSSL_Init();
if (ret != WOLFSSL_SUCCESS) {
pr_err("wolfSSL_Init() failed: %s", wc_GetErrorString(ret));
return -ENOTRECOVERABLE;
}
pr_info("wolfSSL " LIBWOLFSSL_VERSION_STRING " loaded. See https://www.wolfssl.com/ for information.\n");
pr_info("Copyright (C) 2006-2020 wolfSSL Inc. All Rights Reserved.\n");
return 0;
}
module_init(wolfssl_init);
static void __exit wolfssl_exit(void)
{
int ret = wolfSSL_Cleanup();
if (ret != WOLFSSL_SUCCESS)
pr_err("wolfSSL_Cleanup() failed: %s", wc_GetErrorString(ret));
return;
}
module_exit(wolfssl_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("https://www.wolfssl.com/");
MODULE_DESCRIPTION("libwolfssl cryptographic and protocol facilities");
MODULE_VERSION(LIBWOLFSSL_VERSION_STRING);

28
linuxkm/wolfssl_linuxkm.c
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@ -1,28 +0,0 @@
/* http://h-wrt.com/en/mini-how-to/autotoolsSimpleModule */
/* src/module_hello.c */
#include <linux/init.h>
#include <linux/module.h>
static int __init
hello_init(void)
{
printk("Hello, world!\n");
return 0;
}
module_init(hello_init);
static void __exit
hello_exit(void)
{
printk("Goodbye, world!\n");
}
module_exit(hello_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("noname ");
MODULE_DESCRIPTION("\"Hello, world!\" test module");
MODULE_VERSION("printk");

23
m4/ax_linuxkm.m4
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@ -28,14 +28,15 @@ else
fi
])
AC_DEFUN([AC_DEFINE_KERNEL_KFLAGS],
[
AC_MSG_CHECKING([flags for compiling objects for kernel module])
if test -z "${KROOT}" || test -z "${KARCH}"; then
AC_MSG_ERROR([Linux kernel configuration incomplete (KROOT=${KROOT}, KARCH=${KARCH}).])
else
GCC_SHORT_VERSION="$($CC -dumpversion)"
KFLAGS="-I${KROOT}/include -I${KROOT}/include/uapi -I${KROOT}/arch/${KARCH}/include -I${KROOT}/arch/${KARCH}/include/generated -I${KROOT}/arch/${KARCH}/include/generated/uapi -I${KROOT}/arch/${KARCH}/include/uapi -I${KROOT}/tools/include -I${KROOT}/tools/arch/${KARCH}/include -I${KROOT}/tools/include/uapi -I/usr/lib/gcc/${host_cpu}-${host_vendor}-${host_os}/${GCC_SHORT_VERSION}/include"
AC_MSG_RESULT([$KFLAGS])
fi
])
dnl AC_DEFUN([AC_DEFINE_KERNEL_KFLAGS],
dnl [
dnl AC_MSG_CHECKING([flags for compiling objects for kernel module])
dnl if test -z "${KROOT}" || test -z "${KARCH}"; then
dnl AC_MSG_ERROR([Linux kernel configuration incomplete (KROOT=${KROOT}, KARCH=${KARCH}).])
dnl else
dnl GCC_SHORT_VERSION="$($CC -dumpversion)"
dnl KFLAGS="-I${KROOT}/include -I${KROOT}/include/uapi -I${KROOT}/arch/${KARCH}/include -I${KROOT}/arch/${KARCH}/include/generated -I${KROOT}/arch/${KARCH}/include/generated/uapi -I${KROOT}/arch/${KARCH}/include/uapi -I${KROOT}/tools/include -I${KROOT}/tools/arch/${KARCH}/include -I${KROOT}/tools/include/uapi -I/usr/lib/gcc/${host_cpu}-${host_vendor}-${host_os}/${GCC_SHORT_VERSION}/include"
dnl AC_MSG_RESULT([$KFLAGS])
dnl fi
dnl ])
dnl