path: root/package/busybox/patches/470-insmod_search.patch

Index: busybox-1.8.1/modutils/insmod.c
===================================================================
--- busybox-1.8.1.orig/modutils/insmod.c	2007-11-10 02:40:49.000000000 +0100
+++ busybox-1.8.1/modutils/insmod.c	2007-11-10 17:28:44.391223047 +0100
@@ -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
@@ -673,7 +769,6 @@
 #endif
 
 
-#define _PATH_MODULES	"/lib/modules"
 enum { STRVERSIONLEN = 64 };
 
 /*======================================================================*/
@@ -789,27 +884,6 @@
 static char *m_fullName;
 
 
-/*======================================================================*/
-
-
-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 */
-		m_filename = xstrdup(filename);
-		return FALSE;
-	}
-	return TRUE;
-}
-
 
 /*======================================================================*/
 
@@ -3897,145 +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() */
+		tmp = xstrdup(arg1);
+		m_name = basename(tmp);
 	}
 
-	/* 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(_PATH_MODULES, 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(_PATH_MODULES);
-			if (!module_dir)
-				module_dir = xstrdup(_PATH_MODULES);
-			/* 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);
-			}
-		}
-	} 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);
 
@@ -4062,7 +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;
 		}
@@ -4104,7 +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);
@@ -4147,18 +4133,19 @@
 	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 */
@@ -4190,23 +4177,32 @@
 	}
 }
 
-#if !ENABLE_FEATURE_2_4_MODULES
-int insmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int insmod_main(int argc, char **argv)
-#else
-static int insmod_ng_main(int argc, char **argv)
-#endif
+int insmod_main_26(int argc, char **argv)
 {
-	long ret;
-	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;
@@ -4216,36 +4212,47 @@
 		optlen += sprintf(options + optlen, (strchr(*argv,' ') ? "\"%s\" " : "%s "), *argv);
 	}
 
-#if 0
-	/* Any special reason why mmap? It isn't performace critical... */
-	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)",
-				filename, moderror(errno), ret);
+				g_filename, moderror(errno), ret);
 	}
+done:
+	if (g_filename && (g_filename != filename))
+		free(g_filename);
 
-	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;
+}