linuxkm: add linuxkm/module_exports.c.template, and autogenerate linuxkm/module_exports.c.

linuxkm/Kbuild

@@ -1,16 +1,6 @@
-SHELL=/bin/bash
-
 # 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
+SHELL=/bin/bash
 
 ifeq "$(WOLFSSL_OBJ_FILES)" ""
 $(error $$WOLFSSL_OBJ_FILES is unset.)
@@ -20,6 +10,12 @@ ifeq "$(WOLFSSL_CFLAGS)" ""
 $(error $$WOLFSSL_CFLAGS is unset.)
 endif
 
+obj-m := libwolfssl.o
+
+WOLFSSL_OBJ_TARGETS=$(patsubst %, $(obj)/%, $(WOLFSSL_OBJ_FILES))
+
+$(obj)/linuxkm/module_exports.o: $(WOLFSSL_OBJ_TARGETS)
+
 # this mechanism only works in kernel 5.x+ (fallback to hardcoded value)
 hostprogs := linuxkm/get_thread_size
 always-y := $(hostprogs)
@@ -28,16 +24,16 @@ HOST_EXTRACFLAGS += $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CFLAGS) -static
 # this rule is needed to get build to succeed in 4.x (get_thread_size still doesn't get built)
 $(obj)/linuxkm/get_thread_size: $(src)/linuxkm/get_thread_size.c
 
-$(patsubst %, $(obj)/%, $(WOLFSSL_OBJ_FILES)): | $(obj)/linuxkm/get_thread_size
+$(WOLFSSL_OBJ_TARGETS): | $(obj)/linuxkm/get_thread_size
 KERNEL_THREAD_STACK_SIZE=$(shell test -x $(obj)/linuxkm/get_thread_size && $(obj)/linuxkm/get_thread_size || echo 16384)
 MAX_STACK_FRAME_SIZE=$(shell echo $$(( $(KERNEL_THREAD_STACK_SIZE) / 4)))
 
-libwolfssl-y := $(WOLFSSL_OBJ_FILES)
+libwolfssl-y := $(WOLFSSL_OBJ_FILES) linuxkm/module_hooks.o linuxkm/module_exports.o
 
 ccflags-y = $(WOLFSSL_CFLAGS) -Wframe-larger-than=$(MAX_STACK_FRAME_SIZE) -mpreferred-stack-boundary=4
 
 %/libwolfssl.mod.o: ccflags-y :=
-%/lkm_testcrypto.o: ccflags-y += -DNO_MAIN_DRIVER
+%/test.o: ccflags-y += -DNO_MAIN_DRIVER
 
 asflags-y := $(WOLFSSL_ASFLAGS)
 
@@ -45,3 +41,12 @@ asflags-y := $(WOLFSSL_ASFLAGS)
 # but they still irritate objtool: "unannotated intra-function call" and "BP used as a scratch register"
 %/aes_asm.o: OBJECT_FILES_NON_STANDARD := y
 %/aes_gcm_asm.o: OBJECT_FILES_NON_STANDARD := y
+
+# auto-generate the exported symbol list, leveraging the WOLFSSL_API visibility tags.
+# exclude symbols that don't match wc_* or wolf*.
+$(src)/linuxkm/module_exports.c: $(src)/linuxkm/module_exports.c.template $(WOLFSSL_OBJ_TARGETS)
+	@cp $< $@
+	@readelf --symbols --wide $(WOLFSSL_OBJ_TARGETS) | awk '/^ *[0-9]+: /{if ($$8 !~ /^(wc_|wolf)/){next;} if (($$4 == "FUNC") && ($$5 == "GLOBAL") && ($$6 == "DEFAULT")) { print "EXPORT_SYMBOL(" $$8 ");"; }}' >> $@
+	@echo 'EXPORT_SYMBOL(wolfcrypt_test);' >> $@
+
+clean-files := module_exports.c

linuxkm/Makefile

@@ -10,14 +10,14 @@ ifndef SRC_TOP
 SRC_TOP=$(shell dirname $(MODULE_TOP))
 endif
 
-WOLFSSL_CFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CFLAGS) $(CFLAGS) -Wno-declaration-after-statement
+WOLFSSL_CFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CFLAGS) $(CFLAGS) -Wno-declaration-after-statement -Wno-redundant-decls
 ifeq "$(KARCH)" "x86"
 WOLFSSL_CFLAGS+=-msse -mmmx -msse2 -mavx -mavx2
 endif
 
 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/src_libwolfssl_la-%, src/%, $(patsubst src/libwolfssl_la-%, src/%, $(patsubst wolfcrypt/src/src_libwolfssl_la-%, wolfcrypt/src/%, $(src_libwolfssl_la_OBJECTS)))))
+WOLFSSL_OBJ_FILES=$(patsubst %.lo, %.o, $(patsubst src/src_libwolfssl_la-%, src/%, $(patsubst src/libwolfssl_la-%, src/%, $(patsubst wolfcrypt/src/src_libwolfssl_la-%, wolfcrypt/src/%, $(src_libwolfssl_la_OBJECTS)))))
 
 ifeq "$(ENABLED_CRYPT_TESTS)" "yes"
 WOLFSSL_OBJ_FILES+=wolfcrypt/test/test.o

linuxkm/module_exports.c.template

@@ -0,0 +1,138 @@
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
+#include <wolfssl/wolfcrypt/settings.h>
+#include <wolfssl/wolfcrypt/error-crypt.h>
+#include <wolfssl/ssl.h>
+#include <wolfssl/internal.h>
+#ifndef NO_CRYPT_TEST
+#include <wolfcrypt/test/test.h>
+#include <linux/delay.h>
+#endif
+
+#include <wolfssl/wolfcrypt/memory.h>
+#include <wolfssl/wolfcrypt/wc_port.h>
+#include <wolfssl/wolfcrypt/logging.h>
+#include <wolfssl/wolfcrypt/types.h>
+#include <wolfssl/wolfcrypt/asn.h>
+#include <wolfssl/wolfcrypt/md2.h>
+#include <wolfssl/wolfcrypt/md5.h>
+#include <wolfssl/wolfcrypt/md4.h>
+#include <wolfssl/wolfcrypt/sha.h>
+#include <wolfssl/wolfcrypt/sha256.h>
+#include <wolfssl/wolfcrypt/sha512.h>
+#include <wolfssl/wolfcrypt/arc4.h>
+#if defined(WC_NO_RNG)
+    #include <wolfssl/wolfcrypt/integer.h>
+#else
+    #include <wolfssl/wolfcrypt/random.h>
+#endif
+#include <wolfssl/wolfcrypt/coding.h>
+#include <wolfssl/wolfcrypt/signature.h>
+#include <wolfssl/wolfcrypt/rsa.h>
+#include <wolfssl/wolfcrypt/des3.h>
+#include <wolfssl/wolfcrypt/aes.h>
+#include <wolfssl/wolfcrypt/wc_encrypt.h>
+#include <wolfssl/wolfcrypt/cmac.h>
+#include <wolfssl/wolfcrypt/poly1305.h>
+#include <wolfssl/wolfcrypt/camellia.h>
+#include <wolfssl/wolfcrypt/hmac.h>
+#include <wolfssl/wolfcrypt/dh.h>
+#include <wolfssl/wolfcrypt/dsa.h>
+#include <wolfssl/wolfcrypt/srp.h>
+#include <wolfssl/wolfcrypt/idea.h>
+#include <wolfssl/wolfcrypt/hc128.h>
+#include <wolfssl/wolfcrypt/rabbit.h>
+#include <wolfssl/wolfcrypt/chacha.h>
+#include <wolfssl/wolfcrypt/chacha20_poly1305.h>
+#include <wolfssl/wolfcrypt/pwdbased.h>
+#include <wolfssl/wolfcrypt/ripemd.h>
+#include <wolfssl/wolfcrypt/error-crypt.h>
+#ifdef HAVE_ECC
+    #include <wolfssl/wolfcrypt/ecc.h>
+#endif
+#ifdef HAVE_CURVE25519
+    #include <wolfssl/wolfcrypt/curve25519.h>
+#endif
+#ifdef HAVE_ED25519
+    #include <wolfssl/wolfcrypt/ed25519.h>
+#endif
+#ifdef HAVE_CURVE448
+    #include <wolfssl/wolfcrypt/curve448.h>
+#endif
+#ifdef HAVE_ED448
+    #include <wolfssl/wolfcrypt/ed448.h>
+#endif
+#if defined(HAVE_BLAKE2) || defined(HAVE_BLAKE2S)
+    #include <wolfssl/wolfcrypt/blake2.h>
+#endif
+#ifdef WOLFSSL_SHA3
+    #include <wolfssl/wolfcrypt/sha3.h>
+#endif
+#ifdef HAVE_LIBZ
+    #include <wolfssl/wolfcrypt/compress.h>
+#endif
+#ifdef HAVE_PKCS7
+    #include <wolfssl/wolfcrypt/pkcs7.h>
+#endif
+#ifdef HAVE_FIPS
+    #include <wolfssl/wolfcrypt/fips_test.h>
+#endif
+#ifdef HAVE_SELFTEST
+    #include <wolfssl/wolfcrypt/selftest.h>
+#endif
+#ifdef WOLFSSL_ASYNC_CRYPT
+    #include <wolfssl/wolfcrypt/async.h>
+#endif
+#if defined(OPENSSL_EXTRA) || defined(DEBUG_WOLFSSL_VERBOSE)
+    #include <wolfssl/wolfcrypt/logging.h>
+#endif
+#ifdef WOLFSSL_IMX6_CAAM_BLOB
+    #include <wolfssl/wolfcrypt/port/caam/wolfcaam.h>
+#endif
+#ifdef WOLF_CRYPTO_CB
+    #include <wolfssl/wolfcrypt/cryptocb.h>
+    #ifdef HAVE_INTEL_QA_SYNC
+        #include <wolfssl/wolfcrypt/port/intel/quickassist_sync.h>
+    #endif
+    #ifdef HAVE_CAVIUM_OCTEON_SYNC
+        #include <wolfssl/wolfcrypt/port/cavium/cavium_octeon_sync.h>
+    #endif
+#endif
+
+#ifdef _MSC_VER
+    /* 4996 warning to use MS extensions e.g., strcpy_s instead of strncpy */
+    #pragma warning(disable: 4996)
+#endif
+
+#ifdef OPENSSL_EXTRA
+  #ifndef WOLFCRYPT_ONLY
+    #include <wolfssl/openssl/evp.h>
+  #endif
+    #include <wolfssl/openssl/rand.h>
+    #include <wolfssl/openssl/hmac.h>
+    #include <wolfssl/openssl/aes.h>
+    #include <wolfssl/openssl/des.h>
+#endif
+
+#if defined(NO_FILESYSTEM)
+    #if !defined(USE_CERT_BUFFERS_1024) && !defined(USE_CERT_BUFFERS_2048) && \
+        !defined(USE_CERT_BUFFERS_3072) && !defined(USE_CERT_BUFFERS_4096)
+        #define USE_CERT_BUFFERS_2048
+    #endif
+    #if !defined(USE_CERT_BUFFERS_256)
+        #define USE_CERT_BUFFERS_256
+    #endif
+#endif
+
+#if defined(WOLFSSL_CERT_GEN) && (defined(HAVE_ECC384) || defined(HAVE_ALL_CURVES))
+    #define ENABLE_ECC384_CERT_GEN_TEST
+#endif
+
+#include <wolfssl/certs_test.h>
+
+#ifdef HAVE_NTRU
+    #include "libntruencrypt/ntru_crypto.h"
+#endif
+