openwrt-xburst/package/busybox/patches/470-insmod_search.patch

--- a/modutils/insmod.c
+++ b/modutils/insmod.c
@@ -61,21 +61,117 @@
 #include "libbb.h"
 #include <libgen.h>
 #include <sys/utsname.h>
+#if ENABLE_FEATURE_2_6_MODULES
+#include <sys/mman.h>
+#include <asm/unistd.h>
+#include <sys/syscall.h>
+#endif
 
 #if !ENABLE_FEATURE_2_4_MODULES && !ENABLE_FEATURE_2_6_MODULES
 #undef ENABLE_FEATURE_2_4_MODULES
 #define ENABLE_FEATURE_2_4_MODULES 1
 #endif
 
-/*
- * Big piece of 2.4-specific code
- */
 #if ENABLE_FEATURE_2_4_MODULES
-
+int insmod_main_24(int argc, char **argv);
+#endif
 #if ENABLE_FEATURE_2_6_MODULES
-static int insmod_ng_main(int argc, char **argv);
+int insmod_main_26(int argc, char **argv);
 #endif
+int insmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 
+static char *g_filename = NULL;
+#define _PATH_MODULES	"/lib/modules"
+
+static int check_module_name_match(const char *filename, struct stat *statbuf,
+				   void *userdata, int depth)
+{
+	char *fullname = (char *) userdata;
+	char *tmp;
+
+	if (fullname[0] == '\0')
+		return FALSE;
+
+	tmp = bb_get_last_path_component_nostrip(filename);
+	if (strcmp(tmp, fullname) == 0) {
+		/* Stop searching if we find a match */
+		g_filename = xstrdup(filename);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static int find_module(char *filename)
+{
+	char *module_dir, real_module_dir[FILENAME_MAX];
+	int len, slen, ret = ENOENT, k_version;
+	struct utsname myuname;
+	const char *suffix;
+	struct stat st;
+
+	/* check the kernel version */
+	if ((uname(&myuname) != 0) || (myuname.release[0] != '2'))
+		return EINVAL;
+
+	k_version = myuname.release[2] - '0';
+#if ENABLE_FEATURE_2_4_MODULES
+	if (k_version <= 4)
+		suffix = ".o";
+	else
+#endif
+		suffix = ".ko";
+
+	len = strlen(filename);
+	slen = strlen(suffix);
+
+	/* check for suffix and absolute path first */
+	if ((len < slen + 2) || (strcmp(filename + len - slen, suffix) != 0)) {
+		filename = xasprintf("%s%s", filename, suffix);
+	} else {
+		filename = strdup(filename);
+		if ((stat(filename, &st) == 0) && S_ISREG(st.st_mode)) {
+			g_filename = filename;
+			return 0;
+		}
+		free(filename);
+		return ENOENT;
+	}
+
+	/* next: scan /lib/modules/<release> */
+	/* Jump through hoops in case /lib/modules/`uname -r`
+	* is a symlink.  We do not want recursive_action to
+	* follow symlinks, but we do want to follow the
+	* /lib/modules/`uname -r` dir, So resolve it ourselves
+	* if it is a link... */
+	module_dir = concat_path_file(_PATH_MODULES, myuname.release);
+	if (realpath(module_dir, real_module_dir) != NULL) {
+		free(module_dir);
+		module_dir = real_module_dir;
+	}
+
+	recursive_action(module_dir, ACTION_RECURSE,
+		check_module_name_match, 0, filename, 0);
+
+	/* Check if we have a complete path */
+	if (g_filename == NULL)
+		goto done;
+
+	if ((stat(g_filename, &st) == 0) && S_ISREG(st.st_mode))
+		ret = 0;
+	else
+		free(g_filename);
+
+done:
+	free(filename);
+
+	return ret;
+}
+
+/*
+ * Big piece of 2.4-specific code
+ */
+#if ENABLE_FEATURE_2_4_MODULES
 #if ENABLE_FEATURE_INSMOD_LOADINKMEM
 #define LOADBITS 0
 #else
@@ -184,7 +280,6 @@
 /* Microblaze */
 #if defined(__microblaze__)
 #define USE_SINGLE
-#include <linux/elf-em.h>
 #define MATCH_MACHINE(x) (x == EM_XILINX_MICROBLAZE)
 #define SHT_RELM	SHT_RELA
 #define Elf32_RelM	Elf32_Rela
@@ -452,7 +547,7 @@
 /* The system calls unchanged between 2.0 and 2.1.  */
 
 unsigned long create_module(const char *, size_t);
-int delete_module(const char *module, unsigned int flags);
+int delete_module(const char *);
 
 
 #endif /* module.h */
@@ -652,7 +747,7 @@
 
 static enum obj_reloc arch_apply_relocation(struct obj_file *f,
 				      struct obj_section *targsec,
-				      /*struct obj_section *symsec,*/
+				      struct obj_section *symsec,
 				      struct obj_symbol *sym,
 				      ElfW(RelM) *rel, ElfW(Addr) value);
 
@@ -673,6 +768,7 @@
 #define SPFX	""
 #endif
 
+
 enum { STRVERSIONLEN = 64 };
 
 /*======================================================================*/
@@ -788,28 +884,6 @@
 static char *m_fullName;
 
 
-/*======================================================================*/
-
-
-static int check_module_name_match(const char *filename,
-		struct stat *statbuf ATTRIBUTE_UNUSED,
-		void *userdata, int depth ATTRIBUTE_UNUSED)
-{
-	char *fullname = (char *) userdata;
-	char *tmp;
-
-	if (fullname[0] == '\0')
-		return FALSE;
-
-	tmp = bb_get_last_path_component_nostrip(filename);
-	if (strcmp(tmp, fullname) == 0) {
-		/* Stop searching if we find a match */
-		m_filename = xstrdup(filename);
-		return FALSE;
-	}
-	return TRUE;
-}
-
 
 /*======================================================================*/
 
@@ -835,27 +909,18 @@
 static enum obj_reloc
 arch_apply_relocation(struct obj_file *f,
 				struct obj_section *targsec,
-				/*struct obj_section *symsec,*/
+				struct obj_section *symsec,
 				struct obj_symbol *sym,
 				ElfW(RelM) *rel, ElfW(Addr) v)
 {
-#if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \
- || defined(__sh__) || defined(__s390__) || defined(__x86_64__)
 	struct arch_file *ifile = (struct arch_file *) f;
-#endif
 	enum obj_reloc ret = obj_reloc_ok;
 	ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset);
-#if defined(__arm__) || defined(__H8300H__) || defined(__H8300S__) \
- || defined(__i386__) || defined(__mc68000__) || defined(__microblaze__) \
- || defined(__mips__) || defined(__nios2__) || defined(__powerpc__) \
- || defined(__s390__) || defined(__sh__) || defined(__x86_64__)
 	ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset;
-#endif
 #if defined(USE_GOT_ENTRIES) || defined(USE_PLT_ENTRIES)
 	struct arch_symbol *isym = (struct arch_symbol *) sym;
 #endif
-#if defined(__arm__) || defined(__i386__) || defined(__mc68000__) \
- || defined(__sh__) || defined(__s390__)
+#if defined(__arm__) || defined(__i386__) || defined(__mc68000__) || defined(__sh__) || defined(__s390__)
 #if defined(USE_GOT_ENTRIES)
 	ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0;
 #endif
@@ -953,7 +1018,6 @@
 
 		case R_386_PLT32:
 		case R_386_PC32:
-		case R_386_GOTOFF:
 			*loc += v - dot;
 			break;
 
@@ -972,6 +1036,9 @@
 
 		case R_386_GOT32:
 			goto bb_use_got;
+
+		case R_386_GOTOFF:
+			*loc += v - got;
 			break;
 
 #elif defined(__microblaze__)
@@ -1758,7 +1825,7 @@
 
 #if defined(USE_SINGLE)
 
-static int arch_single_init(/*ElfW(RelM) *rel,*/ struct arch_single_entry *single,
+static int arch_single_init(ElfW(RelM) *rel, struct arch_single_entry *single,
 			     int offset, int size)
 {
 	if (single->allocated == 0) {
@@ -1906,7 +1973,7 @@
 #if defined(USE_GOT_ENTRIES)
 			if (got_allocate) {
 				got_offset += arch_single_init(
-						/*rel,*/ &intsym->gotent,
+						rel, &intsym->gotent,
 						got_offset, GOT_ENTRY_SIZE);
 
 				got_needed = 1;
@@ -1920,7 +1987,7 @@
 						plt_offset, PLT_ENTRY_SIZE);
 #else
 				plt_offset += arch_single_init(
-						/*rel,*/ &intsym->pltent,
+						rel, &intsym->pltent,
 						plt_offset, PLT_ENTRY_SIZE);
 #endif
 				plt_needed = 1;
@@ -1958,8 +2025,7 @@
 	while (n > 0) {
 		ch = *name++;
 		h = (h << 4) + ch;
-		g = (h & 0xf0000000);
-		if (g != 0) {
+		if ((g = (h & 0xf0000000)) != 0) {
 			h ^= g >> 24;
 			h &= ~g;
 		}
@@ -2038,7 +2104,7 @@
 	int n_type = ELF_ST_TYPE(info);
 	int n_binding = ELF_ST_BIND(info);
 
-	for (sym = f->symtab[hash]; sym; sym = sym->next) {
+	for (sym = f->symtab[hash]; sym; sym = sym->next)
 		if (f->symbol_cmp(sym->name, name) == 0) {
 			int o_secidx = sym->secidx;
 			int o_info = sym->info;
@@ -2097,14 +2163,14 @@
 				return sym;
 			}
 		}
-	}
 
 	/* Completely new symbol.  */
 	sym = arch_new_symbol();
 	sym->next = f->symtab[hash];
 	f->symtab[hash] = sym;
 	sym->ksymidx = -1;
-	if (ELF_ST_BIND(info) == STB_LOCAL && symidx != (unsigned long)(-1)) {
+
+	if (ELF_ST_BIND(info) == STB_LOCAL && symidx != -1) {
 		if (symidx >= f->local_symtab_size)
 			bb_error_msg("local symbol %s with index %ld exceeds local_symtab_size %ld",
 					name, (long) symidx, (long) f->local_symtab_size);
@@ -3227,7 +3293,7 @@
 
 			/* Do it! */
 			switch (arch_apply_relocation
-					(f, targsec, /*symsec,*/ intsym, rel, value)
+					(f, targsec, symsec, intsym, rel, value)
 			) {
 			case obj_reloc_ok:
 				break;
@@ -3306,11 +3372,11 @@
 
 /*======================================================================*/
 
-static struct obj_file *obj_load(FILE * fp, int loadprogbits ATTRIBUTE_UNUSED)
+static struct obj_file *obj_load(FILE * fp, int loadprogbits)
 {
 	struct obj_file *f;
 	ElfW(Shdr) * section_headers;
-	size_t shnum, i;
+	int shnum, i;
 	char *shstrtab;
 
 	/* Read the file header.  */
@@ -3582,7 +3648,7 @@
 		while (ptr < endptr) {
 			value = strchr(ptr, '=');
 			if (value && strncmp(ptr, "license", value-ptr) == 0) {
-				unsigned i;
+				int i;
 				if (license)
 					*license = value+1;
 				for (i = 0; i < ARRAY_SIZE(gpl_licenses); ++i) {
@@ -3686,9 +3752,6 @@
  * start of some sections.  this info is used by ksymoops to do better
  * debugging.
  */
-#if !ENABLE_FEATURE_INSMOD_VERSION_CHECKING
-#define get_module_version(f, str) get_module_version(str)
-#endif
 static int
 get_module_version(struct obj_file *f, char str[STRVERSIONLEN])
 {
@@ -3721,8 +3784,7 @@
 	struct obj_symbol *sym;
 	char *name, *absolute_filename;
 	char str[STRVERSIONLEN];
-	unsigned i;
-	int l, lm_name, lfilename, use_ksymtab, version;
+	int i, l, lm_name, lfilename, use_ksymtab, version;
 	struct stat statbuf;
 
 	/* WARNING: was using realpath, but replaced by readlink to stop using
@@ -3909,145 +3971,57 @@
 void print_load_map(struct obj_file *f);
 #endif
 
-int insmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int insmod_main(int argc, char **argv)
+int insmod_main_24( int argc, char **argv)
 {
 	char *opt_o, *arg1;
-	int len;
 	int k_crcs;
-	char *tmp, *tmp1;
 	unsigned long m_size;
 	ElfW(Addr) m_addr;
 	struct obj_file *f;
-	struct stat st;
-	char *m_name = NULL;
-	int exit_status = EXIT_FAILURE;
+	char *tmp = NULL, *m_name = NULL;
+	int ret = EINVAL;
 	int m_has_modinfo;
 #if ENABLE_FEATURE_INSMOD_VERSION_CHECKING
 	struct utsname uts_info;
 	char m_strversion[STRVERSIONLEN];
 	int m_version, m_crcs;
 #endif
-#if ENABLE_FEATURE_CLEAN_UP
 	FILE *fp = NULL;
-#else
-	FILE *fp;
-#endif
-	int k_version = 0;
+	int k_version;
 	struct utsname myuname;
 
+	/* check the kernel version */
+	if ((uname(&myuname) != 0) || (myuname.release[0] != '2'))
+		return EINVAL;
+
+	k_version = myuname.release[2] - '0';
+	if (k_version > 4)
+		return ENOTSUP;
+
 	/* Parse any options */
 	getopt32(argv, OPTION_STR, &opt_o);
 	arg1 = argv[optind];
 	if (option_mask32 & OPT_o) { // -o /* name the output module */
-		free(m_name);
 		m_name = xstrdup(opt_o);
 	}
 
-	if (arg1 == NULL) {
+	if (arg1 == NULL)
 		bb_show_usage();
-	}
-
-	/* Grab the module name */
-	tmp1 = xstrdup(arg1);
-	tmp = basename(tmp1);
-	len = strlen(tmp);
-
-	if (uname(&myuname) == 0) {
-		if (myuname.release[0] == '2') {
-			k_version = myuname.release[2] - '0';
-		}
-	}
-
-#if ENABLE_FEATURE_2_6_MODULES
-	if (k_version > 4 && len > 3 && tmp[len - 3] == '.'
-	 && tmp[len - 2] == 'k' && tmp[len - 1] == 'o'
-	) {
-		len -= 3;
-		tmp[len] = '\0';
-	} else
-#endif
-		if (len > 2 && tmp[len - 2] == '.' && tmp[len - 1] == 'o') {
-			len -= 2;
-			tmp[len] = '\0';
-		}
 
-
-#if ENABLE_FEATURE_2_6_MODULES
-	if (k_version > 4)
-		m_fullName = xasprintf("%s.ko", tmp);
-	else
-#endif
-		m_fullName = xasprintf("%s.o", tmp);
+	ret = find_module(arg1);
+	if (ret)
+		goto out;
 
 	if (!m_name) {
-		m_name = tmp;
-	} else {
-		free(tmp1);
-		tmp1 = NULL;       /* flag for free(m_name) before exit() */
-	}
-
-	/* Get a filedesc for the module.  Check that we have a complete path */
-	if (stat(arg1, &st) < 0 || !S_ISREG(st.st_mode)
-	 || (fp = fopen(arg1, "r")) == NULL
-	) {
-		/* Hmm.  Could not open it.  First search under /lib/modules/`uname -r`,
-		 * but do not error out yet if we fail to find it... */
-		if (k_version) {	/* uname succeedd */
-			char *module_dir;
-			char *tmdn;
-
-			tmdn = concat_path_file(CONFIG_DEFAULT_MODULES_DIR, myuname.release);
-			/* Jump through hoops in case /lib/modules/`uname -r`
-			 * is a symlink.  We do not want recursive_action to
-			 * follow symlinks, but we do want to follow the
-			 * /lib/modules/`uname -r` dir, So resolve it ourselves
-			 * if it is a link... */
-			module_dir = xmalloc_readlink(tmdn);
-			if (!module_dir)
-				module_dir = xstrdup(tmdn);
-			recursive_action(module_dir, ACTION_RECURSE,
-					check_module_name_match, NULL, m_fullName, 0);
-			free(module_dir);
-			free(tmdn);
-		}
-
-		/* Check if we have found anything yet */
-		if (!m_filename || ((fp = fopen(m_filename, "r")) == NULL)) {
-			int r;
-			char *module_dir;
-
-			free(m_filename);
-			m_filename = NULL;
-			module_dir = xmalloc_readlink(CONFIG_DEFAULT_MODULES_DIR);
-			if (!module_dir)
-				module_dir = xstrdup(CONFIG_DEFAULT_MODULES_DIR);
-			/* No module found under /lib/modules/`uname -r`, this
-			 * time cast the net a bit wider.  Search /lib/modules/ */
-			r = recursive_action(module_dir, ACTION_RECURSE,
-					check_module_name_match, NULL, m_fullName, 0);
-			if (r)
-				bb_error_msg_and_die("%s: module not found", m_fullName);
-			free(module_dir);
-			if (m_filename == NULL
-			 || ((fp = fopen(m_filename, "r")) == NULL)
-			) {
-				bb_error_msg_and_die("%s: module not found", m_fullName);
-			}
+		tmp = xstrdup(arg1);
+		m_name = basename(tmp);
 		}
-	} else
-		m_filename = xstrdup(arg1);
 
-	if (flag_verbose)
-		printf("Using %s\n", m_filename);
-
-#if ENABLE_FEATURE_2_6_MODULES
-	if (k_version > 4) {
-		argv[optind] = m_filename;
-		optind--;
-		return insmod_ng_main(argc - optind, argv + optind);
+	fp = fopen(g_filename, "r");
+	if (!fp) {
+		ret = errno;
+		goto out;
 	}
-#endif
 
 	f = obj_load(fp, LOADBITS);
 
@@ -4074,7 +4048,7 @@
 				"\t%s was compiled for kernel version %s\n"
 				"\twhile this kernel is version %s",
 				flag_force_load ? "warning: " : "",
-				m_filename, m_strversion, uts_info.release);
+				g_filename, m_strversion, uts_info.release);
 			if (!flag_force_load)
 				goto out;
 		}
@@ -4116,7 +4090,7 @@
 	hide_special_symbols(f);
 
 #if ENABLE_FEATURE_INSMOD_KSYMOOPS_SYMBOLS
-	add_ksymoops_symbols(f, m_filename, m_name);
+	add_ksymoops_symbols(f, g_filename, m_name);
 #endif /* FEATURE_INSMOD_KSYMOOPS_SYMBOLS */
 
 	new_create_module_ksymtab(f);
@@ -4125,7 +4099,7 @@
 	m_size = obj_load_size(f);
 
 	m_addr = create_module(m_name, m_size);
-	if (m_addr == (ElfW(Addr))(-1)) switch (errno) {
+	if (m_addr == -1) switch (errno) {
 		case EEXIST:
 			bb_error_msg_and_die("a module named %s already exists", m_name);
 		case ENOMEM:
@@ -4141,36 +4115,37 @@
 	 * now we can load them directly into the kernel memory
 	 */
 	if (!obj_load_progbits(fp, f, (char*)m_addr)) {
-		delete_module(m_name, 0);
+		delete_module(m_name);
 		goto out;
 	}
 #endif
 
 	if (!obj_relocate(f, m_addr)) {
-		delete_module(m_name, 0);
+		delete_module(m_name);
 		goto out;
 	}
 
 	if (!new_init_module(m_name, f, m_size)) {
-		delete_module(m_name, 0);
+		delete_module(m_name);
 		goto out;
 	}
 
 	if (flag_print_load_map)
 		print_load_map(f);
 
-	exit_status = EXIT_SUCCESS;
+	ret = EXIT_SUCCESS;
 
  out:
 #if ENABLE_FEATURE_CLEAN_UP
 	if (fp)
 		fclose(fp);
-	free(tmp1);
-	if (!tmp1)
+	if (tmp)
+		free(tmp);
+	else if (m_name)
 		free(m_name);
-	free(m_filename);
+	free(g_filename);
 #endif
-	return exit_status;
+	return ret;
 }
 
 #endif /* ENABLE_FEATURE_2_4_MODULES */
@@ -4182,15 +4157,8 @@
 #if ENABLE_FEATURE_2_6_MODULES
 
 #include <sys/mman.h>
-
-#if defined __UCLIBC__ && !ENABLE_FEATURE_2_4_MODULES
-/* big time suckage. The old prototype above renders our nice fwd-decl wrong */
-extern int init_module(void *module, unsigned long len, const char *options);
-#else
 #include <asm/unistd.h>
 #include <sys/syscall.h>
-#define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts)
-#endif
 
 /* We use error numbers in a loose translation... */
 static const char *moderror(int err)
@@ -4209,22 +4177,32 @@
 	}
 }
 
-#if !ENABLE_FEATURE_2_4_MODULES
-int insmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int insmod_main(int argc ATTRIBUTE_UNUSED, char **argv)
-#else
-static int insmod_ng_main(int argc ATTRIBUTE_UNUSED, char **argv)
-#endif
+int insmod_main_26(int argc, char **argv)
 {
-	size_t len;
+	char *filename, *options;
+	struct utsname myuname;
+	int k_version;
 	int optlen;
+	size_t len;
 	void *map;
-	char *filename, *options;
+	long ret = 0;
+
+	/* check the kernel version */
+	if ((uname(&myuname) != 0) || (myuname.release[0] != '2'))
+		return EINVAL;
+
+	k_version = myuname.release[2] - '0';
+	if (k_version <= 4)
+		return ENOTSUP;
 
 	filename = *++argv;
 	if (!filename)
 		bb_show_usage();
 
+	ret = find_module(filename);
+	if (ret || (g_filename == NULL))
+		goto done;
+
 	/* Rest is options */
 	options = xzalloc(1);
 	optlen = 0;
@@ -4234,41 +4212,47 @@
 		optlen += sprintf(options + optlen, (strchr(*argv,' ') ? "\"%s\" " : "%s "), *argv);
 	}
 
-#if 0
-	/* Any special reason why mmap? It isn't performance critical. -vda */
-	/* Yes, xmalloc'ing can use *alot* of RAM. Don't forget that there are
-	 * modules out there that are half a megabyte! mmap()ing is way nicer
-	 * for small mem boxes, i guess. */
-	/* But after load, these modules will take up that 0.5mb in kernel
-	 * anyway. Using malloc here causes only a transient spike to 1mb,
-	 * after module is loaded, we go back to normal 0.5mb usage
-	 * (in kernel). Also, mmap isn't magic - when we touch mapped data,
-	 * we use memory. -vda */
-	int fd;
-	struct stat st;
-	unsigned long len;
-	fd = xopen(filename, O_RDONLY);
-	fstat(fd, &st);
-	len = st.st_size;
-	map = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
-	if (map == MAP_FAILED) {
-		bb_perror_msg_and_die("cannot mmap '%s'", filename);
-	}
-
-	/* map == NULL on Blackfin, probably on other MMU-less systems too. Workaround. */
-	if (map == NULL) {
-		map = xmalloc(len);
-		xread(fd, map, len);
-	}
-#else
 	len = MAXINT(ssize_t);
-	map = xmalloc_open_read_close(filename, &len);
-#endif
+	map = xmalloc_open_read_close(g_filename, &len);
+	ret = syscall(__NR_init_module, map, len, options);
+	if (ret != 0) {
+		bb_perror_msg_and_die("cannot insert '%s': %s (%li)",
+				g_filename, moderror(errno), ret);
+	}
+done:
+	if (g_filename && (g_filename != filename))
+		free(g_filename);
 
-	if (init_module(map, len, options) != 0)
-		bb_error_msg_and_die("cannot insert '%s': %s",
-				filename, moderror(errno));
-	return 0;
+	return ret;
 }
 
 #endif
+
+int insmod_main(int argc, char **argv)
+{
+	int ret;
+
+	g_filename = NULL;
+#if ENABLE_FEATURE_2_6_MODULES
+	ret = insmod_main_26(argc, argv);
+	if (ret != ENOTSUP)
+		goto done;
+#endif
+
+#if ENABLE_FEATURE_2_4_MODULES
+	ret = insmod_main_24(argc, argv);
+	if (ret != ENOTSUP)
+		goto done;
+#endif
+
+	fprintf(stderr, "Error: Kernel version not supported\n");
+	return 1;
+
+done:
+	if (ret) {
+		errno = ret;
+		bb_perror_msg("Loading module failed");
+		return ret;
+	} else
+		return 0;
+}