kmodloader: fix endianess check

[project/ubox.git] / kmodloader.c

diff --git a/kmodloader.c b/kmodloader.c
index 465d3de84206337d7f18799c93d7e3a15ba90090..a4d492d42348c2fe3c08e3ed02df0e297ba61c93 100644 (file)
--- a/kmodloader.c
+++ b/kmodloader.c
@@ -48,8 +48,6 @@ struct module {
        char *name;
        char *depends;
        char *opts;
-       char **aliases;
-       int naliases;
 
        int size;
        int usage;
@@ -157,10 +155,10 @@ static char* get_module_path(char *name)
 
 static char* get_module_name(char *path)
 {
-       static char name[32];
+       static char name[33];
        char *t;
 
-       strncpy(name, basename(path), sizeof(name));
+       strncpy(name, basename(path), sizeof(name) - 1);
 
        t = strstr(name, ".ko");
        if (t)
@@ -216,6 +214,19 @@ static int elf32_find_section(char *map, const char *section, unsigned int *offs
 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 {
        int clazz = map[EI_CLASS];
+       int endian = map[EI_DATA];
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+       if (endian != ELFDATA2LSB)
+#elif __BYTE_ORDER == __BIG_ENDIAN
+       if (endian != ELFDATA2MSB)
+#else
+#error "unsupported endian"
+#endif
+       {
+               ULOG_ERR("invalid endianess: %d\n", endian);
+               return -1;
+       }
 
        if (clazz == ELFCLASS32)
                return elf32_find_section(map, section, offset, size);
@@ -250,16 +261,11 @@ alloc_module(const char *name, const char * const *aliases, int naliases, const
 {
        struct module *m;
        char *_name, *_dep;
-       char **_aliases;
-       int i, len_aliases;
+       int i;
 
-       len_aliases = naliases * sizeof(aliases[0]);
-       for (i = 0; i < naliases; i++)
-               len_aliases += strlen(aliases[i]) + 1;
        m = calloc_a(sizeof(*m),
                &_name, strlen(name) + 1,
-               &_dep, depends ? strlen(depends) + 2 : 0,
-               &_aliases, len_aliases);
+               &_dep, depends ? strlen(depends) + 2 : 0);
        if (!m)
                return NULL;
 
@@ -275,28 +281,11 @@ alloc_module(const char *name, const char * const *aliases, int naliases, const
                }
        }
        m->size = size;
-       m->naliases = naliases;
-       if (naliases == 0)
-               m->aliases = NULL;
-       else {
-               char *ptr = (char *)_aliases + naliases * sizeof(_aliases[0]);
-               int len;
-
-               i = 0;
-               do {
-                       len = strlen(aliases[i]) + 1;
-                       memcpy(ptr, aliases[i], len);
-                       _aliases[i] = ptr;
-                       ptr += len;
-                       i++;
-               } while (i < naliases);
-               m->aliases = _aliases;
-       }
 
        m->refcnt = 0;
        alloc_module_node(m->name, m, false);
-       for (i = 0; i < m->naliases; i++)
-               alloc_module_node(m->aliases[i], m, true);
+       for (i = 0; i < naliases; i++)
+               alloc_module_node(aliases[i], m, true);
 
        return m;
 }
@@ -351,7 +340,7 @@ static struct module* get_module_info(const char *module, const char *name)
        int fd = open(module, O_RDONLY);
        unsigned int offset, size;
        char *map = MAP_FAILED, *strings, *dep = NULL;
-       const char *aliases[32];
+       const char *aliases[32] = { 0 };
        int naliases = 0;
        struct module *m = NULL;
        struct stat s;
@@ -715,22 +704,24 @@ static int main_insmod(int argc, char **argv)
 
        if (init_module_folders()) {
                fprintf(stderr, "Failed to find the folder holding the modules\n");
-               return -1;
+               ret = -1;
+               goto err;
        }
 
        if (get_module_path(argv[1])) {
                name = argv[1];
        } else if (!get_module_path(name)) {
                fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
-               return -1;
+               ret = -1;
+               goto err;
        }
 
        ret = insert_module(get_module_path(name), options);
-       free(options);
-
        if (ret)
                ULOG_ERR("failed to insert %s\n", get_module_path(name));
 
+err:
+       free(options);
        return ret;
 }
 
@@ -861,7 +852,7 @@ static int main_modprobe(int argc, char **argv)
        if (m && m->state == LOADED) {
                if (!quiet)
                        ULOG_ERR("%s is already loaded\n", name);
-               return -1;
+               return 0;
        } else if (!m) {
                if (!quiet)
                        ULOG_ERR("failed to find a module named %s\n", name);
@@ -985,20 +976,23 @@ out:
        return 0;
 }
 
+static inline char weight(char c)
+{
+       return c == '_' ? '-' : c;
+}
+
 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
 {
        const char *s1 = k1;
        const char *s2 = k2;
 
-       while (*s1 && ((*s1 == *s2) ||
-                      ((*s1 == '_') && (*s2 == '-')) ||
-                      ((*s1 == '-') && (*s2 == '_'))))
+       while (*s1 && (weight(*s1) == weight(*s2)))
        {
                s1++;
                s2++;
        }
 
-       return *(const unsigned char *)s1 - *(const unsigned char *)s2;
+       return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
 }
 
 int main(int argc, char **argv)