[3320] | 1 | /*
|
---|
| 2 | * Common modutils related functions for busybox
|
---|
| 3 | *
|
---|
| 4 | * Copyright (C) 2008 by Timo Teras <timo.teras@iki.fi>
|
---|
| 5 | *
|
---|
| 6 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
| 7 | */
|
---|
| 8 | #include "modutils.h"
|
---|
| 9 |
|
---|
| 10 | #ifdef __UCLIBC__
|
---|
| 11 | extern int init_module(void *module, unsigned long len, const char *options);
|
---|
| 12 | extern int delete_module(const char *module, unsigned int flags);
|
---|
| 13 | #else
|
---|
| 14 | # include <sys/syscall.h>
|
---|
| 15 | # define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts)
|
---|
| 16 | # define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags)
|
---|
| 17 | #endif
|
---|
| 18 |
|
---|
| 19 | void FAST_FUNC replace(char *s, char what, char with)
|
---|
| 20 | {
|
---|
| 21 | while (*s) {
|
---|
| 22 | if (what == *s)
|
---|
| 23 | *s = with;
|
---|
| 24 | ++s;
|
---|
| 25 | }
|
---|
| 26 | }
|
---|
| 27 |
|
---|
| 28 | char* FAST_FUNC replace_underscores(char *s)
|
---|
| 29 | {
|
---|
| 30 | replace(s, '-', '_');
|
---|
| 31 | return s;
|
---|
| 32 | }
|
---|
| 33 |
|
---|
| 34 | int FAST_FUNC string_to_llist(char *string, llist_t **llist, const char *delim)
|
---|
| 35 | {
|
---|
| 36 | char *tok;
|
---|
| 37 | int len = 0;
|
---|
| 38 |
|
---|
| 39 | while ((tok = strsep(&string, delim)) != NULL) {
|
---|
| 40 | if (tok[0] == '\0')
|
---|
| 41 | continue;
|
---|
| 42 | llist_add_to_end(llist, xstrdup(tok));
|
---|
| 43 | len += strlen(tok);
|
---|
| 44 | }
|
---|
| 45 | return len;
|
---|
| 46 | }
|
---|
| 47 |
|
---|
| 48 | char* FAST_FUNC filename2modname(const char *filename, char *modname)
|
---|
| 49 | {
|
---|
| 50 | int i;
|
---|
| 51 | char *from;
|
---|
| 52 |
|
---|
| 53 | if (filename == NULL)
|
---|
| 54 | return NULL;
|
---|
| 55 | if (modname == NULL)
|
---|
| 56 | modname = xmalloc(MODULE_NAME_LEN);
|
---|
| 57 | from = bb_get_last_path_component_nostrip(filename);
|
---|
| 58 | for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++)
|
---|
| 59 | modname[i] = (from[i] == '-') ? '_' : from[i];
|
---|
| 60 | modname[i] = '\0';
|
---|
| 61 |
|
---|
| 62 | return modname;
|
---|
| 63 | }
|
---|
| 64 |
|
---|
| 65 | char* FAST_FUNC parse_cmdline_module_options(char **argv)
|
---|
| 66 | {
|
---|
| 67 | char *options;
|
---|
| 68 | int optlen;
|
---|
| 69 |
|
---|
| 70 | options = xzalloc(1);
|
---|
| 71 | optlen = 0;
|
---|
| 72 | while (*++argv) {
|
---|
| 73 | options = xrealloc(options, optlen + 2 + strlen(*argv) + 2);
|
---|
| 74 | /* Spaces handled by "" pairs, but no way of escaping quotes */
|
---|
| 75 | //TODO: module-init-tools version 3.11.1 quotes only value:
|
---|
| 76 | //it generates var="val with spaces", not "var=val with spaces"
|
---|
| 77 | //(and it won't quote var *name* even if it has spaces)
|
---|
| 78 | optlen += sprintf(options + optlen, (strchr(*argv, ' ') ? "\"%s\" " : "%s "), *argv);
|
---|
| 79 | }
|
---|
| 80 | return options;
|
---|
| 81 | }
|
---|
| 82 |
|
---|
| 83 | #if ENABLE_FEATURE_INSMOD_TRY_MMAP
|
---|
| 84 | void* FAST_FUNC try_to_mmap_module(const char *filename, size_t *image_size_p)
|
---|
| 85 | {
|
---|
| 86 | /* We have user reports of failure to load 3MB module
|
---|
| 87 | * on a 16MB RAM machine. Apparently even a transient
|
---|
| 88 | * memory spike to 6MB during module load
|
---|
| 89 | * is too big for that system. */
|
---|
| 90 | void *image;
|
---|
| 91 | struct stat st;
|
---|
| 92 | int fd;
|
---|
| 93 |
|
---|
| 94 | fd = xopen(filename, O_RDONLY);
|
---|
| 95 | fstat(fd, &st);
|
---|
| 96 | image = NULL;
|
---|
| 97 | /* st.st_size is off_t, we can't just pass it to mmap */
|
---|
| 98 | if (st.st_size <= *image_size_p) {
|
---|
| 99 | size_t image_size = st.st_size;
|
---|
| 100 | image = mmap(NULL, image_size, PROT_READ, MAP_PRIVATE, fd, 0);
|
---|
| 101 | if (image == MAP_FAILED) {
|
---|
| 102 | image = NULL;
|
---|
| 103 | } else if (*(uint32_t*)image != SWAP_BE32(0x7f454C46)) {
|
---|
| 104 | /* No ELF signature. Compressed module? */
|
---|
| 105 | munmap(image, image_size);
|
---|
| 106 | image = NULL;
|
---|
| 107 | } else {
|
---|
| 108 | /* Success. Report the size */
|
---|
| 109 | *image_size_p = image_size;
|
---|
| 110 | }
|
---|
| 111 | }
|
---|
| 112 | close(fd);
|
---|
| 113 | return image;
|
---|
| 114 | }
|
---|
| 115 | #endif
|
---|
| 116 |
|
---|
| 117 | /* Return:
|
---|
| 118 | * 0 on success,
|
---|
| 119 | * -errno on open/read error,
|
---|
| 120 | * errno on init_module() error
|
---|
| 121 | */
|
---|
| 122 | int FAST_FUNC bb_init_module(const char *filename, const char *options)
|
---|
| 123 | {
|
---|
| 124 | size_t image_size;
|
---|
| 125 | char *image;
|
---|
| 126 | int rc;
|
---|
| 127 | bool mmaped;
|
---|
| 128 |
|
---|
| 129 | if (!options)
|
---|
| 130 | options = "";
|
---|
| 131 |
|
---|
| 132 | //TODO: audit bb_init_module_24 to match error code convention
|
---|
| 133 | #if ENABLE_FEATURE_2_4_MODULES
|
---|
| 134 | if (get_linux_version_code() < KERNEL_VERSION(2,6,0))
|
---|
| 135 | return bb_init_module_24(filename, options);
|
---|
| 136 | #endif
|
---|
| 137 |
|
---|
| 138 | image_size = INT_MAX - 4095;
|
---|
| 139 | mmaped = 0;
|
---|
| 140 | image = try_to_mmap_module(filename, &image_size);
|
---|
| 141 | if (image) {
|
---|
| 142 | mmaped = 1;
|
---|
| 143 | } else {
|
---|
| 144 | errno = ENOMEM; /* may be changed by e.g. open errors below */
|
---|
| 145 | image = xmalloc_open_zipped_read_close(filename, &image_size);
|
---|
| 146 | if (!image)
|
---|
| 147 | return -errno;
|
---|
| 148 | }
|
---|
| 149 |
|
---|
| 150 | errno = 0;
|
---|
| 151 | init_module(image, image_size, options);
|
---|
| 152 | rc = errno;
|
---|
| 153 | if (mmaped)
|
---|
| 154 | munmap(image, image_size);
|
---|
| 155 | else
|
---|
| 156 | free(image);
|
---|
| 157 | return rc;
|
---|
| 158 | }
|
---|
| 159 |
|
---|
| 160 | int FAST_FUNC bb_delete_module(const char *module, unsigned int flags)
|
---|
| 161 | {
|
---|
| 162 | errno = 0;
|
---|
| 163 | delete_module(module, flags);
|
---|
| 164 | return errno;
|
---|
| 165 | }
|
---|
| 166 |
|
---|
| 167 | const char* FAST_FUNC moderror(int err)
|
---|
| 168 | {
|
---|
| 169 | switch (err) {
|
---|
| 170 | case -1: /* btw: it's -EPERM */
|
---|
| 171 | return "no such module";
|
---|
| 172 | case ENOEXEC:
|
---|
| 173 | return "invalid module format";
|
---|
| 174 | case ENOENT:
|
---|
| 175 | return "unknown symbol in module, or unknown parameter";
|
---|
| 176 | case ESRCH:
|
---|
| 177 | return "module has wrong symbol version";
|
---|
| 178 | case ENOSYS:
|
---|
| 179 | return "kernel does not support requested operation";
|
---|
| 180 | }
|
---|
| 181 | if (err < 0) /* should always be */
|
---|
| 182 | err = -err;
|
---|
| 183 | return strerror(err);
|
---|
| 184 | }
|
---|