/* vi: set sw=4 ts=4: */ /* * simplified modprobe * * Copyright (c) 2008 Vladimir Dronnikov * Copyright (c) 2008 Bernhard Reutner-Fischer (initial depmod code) * * Licensed under GPLv2, see file LICENSE in this source tree. */ /* modprobe-small configs are defined in Config.src to ensure better * "make config" order */ //applet:IF_LSMOD( IF_MODPROBE_SMALL(APPLET_NOEXEC( lsmod, lsmod, BB_DIR_SBIN, BB_SUID_DROP, lsmod ))) //applet:IF_MODPROBE(IF_MODPROBE_SMALL(APPLET_NOEXEC( modprobe, modprobe, BB_DIR_SBIN, BB_SUID_DROP, modprobe))) // APPLET_ODDNAME:name main location suid_type help //applet:IF_DEPMOD( IF_MODPROBE_SMALL(APPLET_ODDNAME(depmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, depmod ))) //applet:IF_INSMOD( IF_MODPROBE_SMALL(APPLET_NOEXEC( insmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, insmod ))) //applet:IF_RMMOD( IF_MODPROBE_SMALL(APPLET_NOEXEC( rmmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, rmmod ))) /* noexec speeds up boot with many modules loaded (need SH_STANDALONE=y) */ /* I measured about ~5 times faster insmod */ /* depmod is not noexec, it runs longer and benefits from memory trimming via exec */ //kbuild:lib-$(CONFIG_MODPROBE_SMALL) += modprobe-small.o #include "libbb.h" /* After libbb.h, since it needs sys/types.h on some systems */ #include /* uname() */ #include #include #define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts) #define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags) #ifdef __NR_finit_module # define finit_module(fd, uargs, flags) syscall(__NR_finit_module, fd, uargs, flags) #endif /* linux/include/linux/module.h has limit of 64 chars on module names */ #undef MODULE_NAME_LEN #define MODULE_NAME_LEN 64 #if 1 # define dbg1_error_msg(...) ((void)0) # define dbg2_error_msg(...) ((void)0) #else # define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__) # define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__) #endif #define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb" //usage:#if ENABLE_MODPROBE_SMALL //usage:#define lsmod_trivial_usage //usage: "" //usage:#define lsmod_full_usage "\n\n" //usage: "List loaded kernel modules" //usage:#endif #if ENABLE_LSMOD int lsmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int lsmod_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) { xprint_and_close_file(xfopen_for_read("/proc/modules")); return EXIT_SUCCESS; } #endif /* Num of applets that use modprobe_main() entry point. */ /* lsmod is not here. */ #define MOD_APPLET_CNT (ENABLE_MODPROBE + ENABLE_DEPMOD + ENABLE_INSMOD + ENABLE_RMMOD) /* Do not bother if MODPROBE_SMALL=y but no applets selected. */ /* The rest of the file is in this if block. */ #if MOD_APPLET_CNT > 0 #define ONLY_APPLET (MOD_APPLET_CNT == 1) #define is_modprobe (ENABLE_MODPROBE && (ONLY_APPLET || applet_name[0] == 'm')) #define is_depmod (ENABLE_DEPMOD && (ONLY_APPLET || applet_name[0] == 'd')) #define is_insmod (ENABLE_INSMOD && (ONLY_APPLET || applet_name[0] == 'i')) #define is_rmmod (ENABLE_RMMOD && (ONLY_APPLET || applet_name[0] == 'r')) enum { DEPMOD_OPT_n = (1 << 0), /* dry-run, print to stdout */ OPT_q = (1 << 0), /* be quiet */ OPT_r = (1 << 1), /* module removal instead of loading */ }; typedef struct module_info { char *pathname; char *aliases; char *deps; smallint open_read_failed; } module_info; /* * GLOBALS */ struct globals { module_info *modinfo; char *module_load_options; smallint dep_bb_seen; smallint wrote_dep_bb_ok; unsigned module_count; int module_found_idx; unsigned stringbuf_idx; unsigned stringbuf_size; char *stringbuf; /* some modules have lots of stuff */ /* for example, drivers/media/video/saa7134/saa7134.ko */ /* therefore having a fixed biggish buffer is not wise */ }; #define G (*ptr_to_globals) #define modinfo (G.modinfo ) #define dep_bb_seen (G.dep_bb_seen ) #define wrote_dep_bb_ok (G.wrote_dep_bb_ok ) #define module_count (G.module_count ) #define module_found_idx (G.module_found_idx ) #define module_load_options (G.module_load_options) #define stringbuf_idx (G.stringbuf_idx ) #define stringbuf_size (G.stringbuf_size ) #define stringbuf (G.stringbuf ) #define INIT_G() do { \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ } while (0) static void append(const char *s) { unsigned len = strlen(s); if (stringbuf_idx + len + 15 > stringbuf_size) { stringbuf_size = stringbuf_idx + len + 127; dbg2_error_msg("grow stringbuf to %u", stringbuf_size); stringbuf = xrealloc(stringbuf, stringbuf_size); } memcpy(stringbuf + stringbuf_idx, s, len); stringbuf_idx += len; } static void appendc(char c) { /* We appendc() only after append(), + 15 trick in append() * makes it unnecessary to check for overflow here */ stringbuf[stringbuf_idx++] = c; } static void bksp(void) { if (stringbuf_idx) stringbuf_idx--; } static void reset_stringbuf(void) { stringbuf_idx = 0; } static char* copy_stringbuf(void) { char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */ return memcpy(copy, stringbuf, stringbuf_idx); } static char* find_keyword(char *ptr, size_t len, const char *word) { if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */ return NULL; len -= strlen(word) - 1; while ((ssize_t)len > 0) { char *old = ptr; char *after_word; /* search for the first char in word */ ptr = memchr(ptr, word[0], len); if (ptr == NULL) /* no occurrence left, done */ break; after_word = is_prefixed_with(ptr, word); if (after_word) return after_word; /* found, return ptr past it */ ++ptr; len -= (ptr - old); } return NULL; } static void replace(char *s, char what, char with) { while (*s) { if (what == *s) *s = with; ++s; } } static char *filename2modname(const char *filename, char *modname) { int i; const char *from; // Disabled since otherwise "modprobe dir/name" would work // as if it is "modprobe name". It is unclear why // 'basenamization' was here in the first place. //from = bb_get_last_path_component_nostrip(filename); from = filename; for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++) modname[i] = (from[i] == '-') ? '_' : from[i]; modname[i] = '\0'; return modname; } static int pathname_matches_modname(const char *pathname, const char *modname) { int r; char name[MODULE_NAME_LEN]; filename2modname(bb_get_last_path_component_nostrip(pathname), name); r = (strcmp(name, modname) == 0); return r; } /* Take "word word", return malloced "word",NUL,"word",NUL,NUL */ static char* str_2_list(const char *str) { int len = strlen(str) + 1; char *dst = xmalloc(len + 1); dst[len] = '\0'; memcpy(dst, str, len); //TODO: protect against 2+ spaces: "word word" replace(dst, ' ', '\0'); return dst; } /* We use error numbers in a loose translation... */ static const char *moderror(int err) { switch (err) { case ENOEXEC: return "invalid module format"; case ENOENT: return "unknown symbol in module or invalid parameter"; case ESRCH: return "module has wrong symbol version"; case EINVAL: /* "invalid parameter" */ return "unknown symbol in module or invalid parameter" + sizeof("unknown symbol in module or"); default: return strerror(err); } } static int load_module(const char *fname, const char *options) { #if 1 int r; size_t len = MAXINT(ssize_t); char *module_image; if (!options) options = ""; dbg1_error_msg("load_module('%s','%s')", fname, options); /* * First we try finit_module if available. Some kernels are configured * to only allow loading of modules off of secure storage (like a read- * only rootfs) which needs the finit_module call. If it fails, we fall * back to normal module loading to support compressed modules. */ r = 1; # ifdef __NR_finit_module { int fd = open(fname, O_RDONLY | O_CLOEXEC); if (fd >= 0) { r = finit_module(fd, options, 0) != 0; close(fd); } } # endif if (r != 0) { module_image = xmalloc_open_zipped_read_close(fname, &len); r = (!module_image || init_module(module_image, len, options) != 0); free(module_image); } dbg1_error_msg("load_module:%d", r); return r; /* 0 = success */ #else /* For testing */ dbg1_error_msg("load_module('%s','%s')", fname, options); return 1; #endif } /* Returns !0 if open/read was unsuccessful */ static int parse_module(module_info *info, const char *pathname) { char *module_image; char *ptr; size_t len; size_t pos; dbg1_error_msg("parse_module('%s')", pathname); /* Read (possibly compressed) module */ errno = 0; len = 64 * 1024 * 1024; /* 64 Mb at most */ module_image = xmalloc_open_zipped_read_close(pathname, &len); /* module_image == NULL is ok here, find_keyword handles it */ //TODO: optimize redundant module body reads /* "alias1 symbol:sym1 alias2 symbol:sym2" */ reset_stringbuf(); pos = 0; while (1) { unsigned start = stringbuf_idx; ptr = find_keyword(module_image + pos, len - pos, "alias="); if (!ptr) { ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_"); if (!ptr) break; /* DOCME: __ksymtab_gpl and __ksymtab_strings occur * in many modules. What do they mean? */ if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0) goto skip; dbg2_error_msg("alias:'symbol:%s'", ptr); append("symbol:"); } else { dbg2_error_msg("alias:'%s'", ptr); } append(ptr); appendc(' '); /* * Don't add redundant aliases, such as: * libcrc32c.ko symbol:crc32c symbol:crc32c */ if (start) { /* "if we aren't the first alias" */ char *found, *last; stringbuf[stringbuf_idx] = '\0'; last = stringbuf + start; /* * String at last-1 is " symbol:crc32c " * (with both leading and trailing spaces). */ if (strncmp(stringbuf, last, stringbuf_idx - start) == 0) /* First alias matches us */ found = stringbuf; else /* Does any other alias match? */ found = strstr(stringbuf, last-1); if (found < last-1) { /* There is absolutely the same string before us */ dbg2_error_msg("redundant:'%s'", last); stringbuf_idx = start; goto skip; } } skip: pos = (ptr - module_image); } bksp(); /* remove last ' ' */ info->aliases = copy_stringbuf(); replace(info->aliases, '-', '_'); /* "dependency1 depandency2" */ reset_stringbuf(); ptr = find_keyword(module_image, len, "depends="); if (ptr && *ptr) { replace(ptr, ',', ' '); replace(ptr, '-', '_'); dbg2_error_msg("dep:'%s'", ptr); append(ptr); } free(module_image); info->deps = copy_stringbuf(); info->open_read_failed = (module_image == NULL); return info->open_read_failed; } static FAST_FUNC int fileAction(struct recursive_state *state, const char *pathname, struct stat *sb UNUSED_PARAM) { const char *modname_to_match = state->userData; int cur; const char *fname; bool is_remove = (ENABLE_RMMOD && ONLY_APPLET) || ((ENABLE_RMMOD || ENABLE_MODPROBE) && (option_mask32 & OPT_r)); pathname += 2; /* skip "./" */ fname = bb_get_last_path_component_nostrip(pathname); if (!strrstr(fname, ".ko")) { dbg1_error_msg("'%s' is not a module", pathname); return TRUE; /* not a module, continue search */ } cur = module_count++; modinfo = xrealloc_vector(modinfo, 12, cur); modinfo[cur].pathname = xstrdup(pathname); /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */ /*modinfo[cur+1].pathname = NULL;*/ if (!pathname_matches_modname(fname, modname_to_match)) { dbg1_error_msg("'%s' module name doesn't match", pathname); return TRUE; /* module name doesn't match, continue search */ } dbg1_error_msg("'%s' module name matches", pathname); module_found_idx = cur; if (parse_module(&modinfo[cur], pathname) != 0) return TRUE; /* failed to open/read it, no point in trying loading */ if (!is_remove) { if (load_module(pathname, module_load_options) == 0) { /* Load was successful, there is nothing else to do. * This can happen ONLY for "top-level" module load, * not a dep, because deps don't do dirscan. */ exit(EXIT_SUCCESS); } } return TRUE; } static int load_dep_bb(void) { char *line; FILE *fp = fopen_for_read(DEPFILE_BB); if (!fp) return 0; dep_bb_seen = 1; dbg1_error_msg("loading "DEPFILE_BB); /* Why? There is a rare scenario: we did not find modprobe.dep.bb, * we scanned the dir and found no module by name, then we search * for alias (full scan), and we decided to generate modprobe.dep.bb. * But we see modprobe.dep.bb.new! Other modprobe is at work! * We wait and other modprobe renames it to modprobe.dep.bb. * Now we can use it. * But we already have modinfo[] filled, and "module_count = 0" * makes us start anew. Yes, we leak modinfo[].xxx pointers - * there is not much of data there anyway. */ module_count = 0; memset(&modinfo[0], 0, sizeof(modinfo[0])); while ((line = xmalloc_fgetline(fp)) != NULL) { char* space; char* linebuf; int cur; if (!line[0]) { free(line); continue; } space = strchrnul(line, ' '); cur = module_count++; modinfo = xrealloc_vector(modinfo, 12, cur); /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */ modinfo[cur].pathname = line; /* we take ownership of malloced block here */ if (*space) *space++ = '\0'; modinfo[cur].aliases = space; linebuf = xmalloc_fgetline(fp); modinfo[cur].deps = linebuf ? linebuf : xzalloc(1); if (modinfo[cur].deps[0]) { /* deps are not "", so next line must be empty */ line = xmalloc_fgetline(fp); /* Refuse to work with damaged config file */ if (line && line[0]) bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line); free(line); } } return 1; } static int start_dep_bb_writeout(void) { int fd; /* depmod -n: write result to stdout */ if (is_depmod && (option_mask32 & DEPMOD_OPT_n)) return STDOUT_FILENO; fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644); if (fd < 0) { if (errno == EEXIST) { int count = 5 * 20; dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB); while (1) { usleep(1000*1000 / 20); if (load_dep_bb()) { dbg1_error_msg(DEPFILE_BB" appeared"); return -2; /* magic number */ } if (!--count) break; } bb_error_msg("deleting stale %s", DEPFILE_BB".new"); fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC); } } dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd); return fd; } static void write_out_dep_bb(int fd) { int i; FILE *fp; /* We want good error reporting. fdprintf is not good enough. */ fp = xfdopen_for_write(fd); i = 0; while (modinfo[i].pathname) { fprintf(fp, "%s%s%s\n" "%s%s\n", modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases, modinfo[i].deps, modinfo[i].deps[0] ? "\n" : ""); i++; } /* Badly formatted depfile is a no-no. Be paranoid. */ errno = 0; if (ferror(fp) | fclose(fp)) /* | instead of || is intended */ goto err; if (fd == STDOUT_FILENO) /* it was depmod -n */ goto ok; if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) { err: bb_perror_msg("can't create '%s'", DEPFILE_BB); unlink(DEPFILE_BB".new"); } else { ok: wrote_dep_bb_ok = 1; dbg1_error_msg("created "DEPFILE_BB); } } static module_info** find_alias(const char *alias) { int i; int dep_bb_fd; int infoidx; module_info **infovec; dbg1_error_msg("find_alias('%s')", alias); try_again: /* First try to find by name (cheaper) */ i = 0; while (modinfo[i].pathname) { if (pathname_matches_modname(modinfo[i].pathname, alias)) { dbg1_error_msg("found '%s' in module '%s'", alias, modinfo[i].pathname); if (!modinfo[i].aliases) { parse_module(&modinfo[i], modinfo[i].pathname); } infovec = xzalloc(2 * sizeof(infovec[0])); infovec[0] = &modinfo[i]; return infovec; } i++; } /* Ok, we definitely have to scan module bodies. This is a good * moment to generate modprobe.dep.bb, if it does not exist yet */ dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout(); if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */ goto try_again; /* Scan all module bodies, extract modinfo (it contains aliases) */ i = 0; infoidx = 0; infovec = NULL; while (modinfo[i].pathname) { char *desc, *s; if (!modinfo[i].aliases) { parse_module(&modinfo[i], modinfo[i].pathname); } /* "alias1 symbol:sym1 alias2 symbol:sym2" */ desc = str_2_list(modinfo[i].aliases); /* Does matching substring exist? */ for (s = desc; *s; s += strlen(s) + 1) { /* Aliases in module bodies can be defined with * shell patterns. Example: * "pci:v000010DEd000000D9sv*sd*bc*sc*i*". * Plain strcmp() won't catch that */ if (fnmatch(s, alias, 0) == 0) { dbg1_error_msg("found alias '%s' in module '%s'", alias, modinfo[i].pathname); infovec = xrealloc_vector(infovec, 1, infoidx); infovec[infoidx++] = &modinfo[i]; break; } } free(desc); i++; } /* Create module.dep.bb if needed */ if (dep_bb_fd >= 0) { write_out_dep_bb(dep_bb_fd); } dbg1_error_msg("find_alias '%s' returns %d results", alias, infoidx); return infovec; } #if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED // TODO: open only once, invent config_rewind() static int already_loaded(const char *name) { int ret; char *line; FILE *fp; ret = 5 * 2; again: fp = fopen_for_read("/proc/modules"); if (!fp) return 0; while ((line = xmalloc_fgetline(fp)) != NULL) { char *live; char *after_name; // Examples from kernel 3.14.6: //pcspkr 12718 0 - Live 0xffffffffa017e000 //snd_timer 28690 2 snd_seq,snd_pcm, Live 0xffffffffa025e000 //i915 801405 2 - Live 0xffffffffa0096000 after_name = is_prefixed_with(line, name); if (!after_name || *after_name != ' ') { free(line); continue; } live = strstr(line, " Live"); free(line); if (!live) { /* State can be Unloading, Loading, or Live. * modprobe must not return prematurely if we see "Loading": * it can cause further programs to assume load completed, * but it did not (yet)! * Wait up to 5*20 ms for it to resolve. */ ret -= 2; if (ret == 0) break; /* huh? report as "not loaded" */ fclose(fp); usleep(20*1000); goto again; } ret = 1; break; } fclose(fp); return ret & 1; } #else #define already_loaded(name) 0 #endif static int rmmod(const char *filename) { int r; char modname[MODULE_NAME_LEN]; filename2modname(filename, modname); r = delete_module(modname, O_NONBLOCK | O_EXCL); dbg1_error_msg("delete_module('%s', O_NONBLOCK | O_EXCL):%d", modname, r); if (r != 0 && !(option_mask32 & OPT_q)) { bb_perror_msg("remove '%s'", modname); } return r; } /* * Given modules definition and module name (or alias, or symbol) * load/remove the module respecting dependencies. * NB: also called by depmod with bogus name "/", * just in order to force modprobe.dep.bb creation. */ #if !ENABLE_FEATURE_CMDLINE_MODULE_OPTIONS #define process_module(a,b) process_module(a) #define cmdline_options "" #endif static int process_module(char *name, const char *cmdline_options) { char *s, *deps, *options; module_info **infovec; module_info *info; int infoidx; bool is_remove = (ENABLE_RMMOD && ONLY_APPLET) || ((ENABLE_RMMOD || ENABLE_MODPROBE) && (option_mask32 & OPT_r)); int exitcode = EXIT_SUCCESS; dbg1_error_msg("process_module('%s','%s')", name, cmdline_options); replace(name, '-', '_'); dbg1_error_msg("already_loaded:%d is_remove:%d", already_loaded(name), is_remove); if (is_rmmod) { /* Does not remove dependencies, no need to scan, just remove. * (compat note: this allows and strips .ko suffix) */ rmmod(name); return EXIT_SUCCESS; } /* * We used to have "is_remove != already_loaded(name)" check here, but * modprobe -r pci:v00008086d00007010sv00000000sd00000000bc01sc01i80 * won't unload modules (there are more than one) * which have this alias. */ if (!is_remove && already_loaded(name)) { dbg1_error_msg("nothing to do for '%s'", name); return EXIT_SUCCESS; } options = NULL; if (!is_remove) { char *opt_filename = xasprintf("/etc/modules/%s", name); options = xmalloc_open_read_close(opt_filename, NULL); if (options) replace(options, '\n', ' '); #if ENABLE_FEATURE_CMDLINE_MODULE_OPTIONS if (cmdline_options) { /* NB: cmdline_options always have one leading ' ' * (see main()), we remove it here */ char *op = xasprintf(options ? "%s %s" : "%s %s" + 3, cmdline_options + 1, options); free(options); options = op; } #endif free(opt_filename); module_load_options = options; dbg1_error_msg("process_module('%s'): options:'%s'", name, options); } if (!module_count) { /* Scan module directory. This is done only once. * It will attempt module load, and will exit(EXIT_SUCCESS) * on success. */ module_found_idx = -1; recursive_action(".", ACTION_RECURSE, /* flags */ fileAction, /* file action */ NULL, /* dir action */ name /* user data */ ); dbg1_error_msg("dirscan complete"); /* Module was not found, or load failed, or is_remove */ if (module_found_idx >= 0) { /* module was found */ infovec = xzalloc(2 * sizeof(infovec[0])); infovec[0] = &modinfo[module_found_idx]; } else { /* search for alias, not a plain module name */ infovec = find_alias(name); } } else { infovec = find_alias(name); } if (!infovec) { /* both dirscan and find_alias found nothing */ if (!is_remove && !is_depmod) { /* it wasn't rmmod or depmod */ bb_error_msg("module '%s' not found", name); //TODO: _and_die()? or should we continue (un)loading modules listed on cmdline? /* "modprobe non-existing-module; echo $?" must print 1 */ exitcode = EXIT_FAILURE; } goto ret; } /* There can be more than one module for the given alias. For example, * "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches * ata_piix because it has alias "pci:v00008086d00007010sv*sd*bc*sc*i*" * and ata_generic, it has alias "pci:v*d*sv*sd*bc01sc01i*" * Standard modprobe loads them both. We achieve it by returning * a *list* of modinfo pointers from find_alias(). */ /* modprobe -r? unload module(s) */ if (is_remove) { infoidx = 0; while ((info = infovec[infoidx++]) != NULL) { int r = rmmod(bb_get_last_path_component_nostrip(info->pathname)); if (r != 0) { goto ret; /* error */ } } /* modprobe -r: we do not stop here - * continue to unload modules on which the module depends: * "-r --remove: option causes modprobe to remove a module. * If the modules it depends on are also unused, modprobe * will try to remove them, too." */ } infoidx = 0; while ((info = infovec[infoidx++]) != NULL) { /* Iterate thru dependencies, trying to (un)load them */ deps = str_2_list(info->deps); for (s = deps; *s; s += strlen(s) + 1) { //if (strcmp(name, s) != 0) // N.B. do loops exist? dbg1_error_msg("recurse on dep '%s'", s); process_module(s, NULL); dbg1_error_msg("recurse on dep '%s' done", s); } free(deps); if (is_remove) continue; /* We are modprobe: load it */ if (options && strstr(options, "blacklist")) { dbg1_error_msg("'%s': blacklisted", info->pathname); continue; } if (info->open_read_failed) { /* We already tried it, didn't work. Don't try load again */ exitcode = EXIT_FAILURE; continue; } errno = 0; if (load_module(info->pathname, options) != 0) { if (EEXIST != errno) { bb_error_msg("'%s': %s", info->pathname, moderror(errno)); } else { dbg1_error_msg("'%s': %s", info->pathname, moderror(errno)); } exitcode = EXIT_FAILURE; } } ret: free(infovec); free(options); return exitcode; } #undef cmdline_options /* For reference, module-init-tools v3.4 options: # insmod Usage: insmod filename [args] # rmmod --help Usage: rmmod [-fhswvV] modulename ... -f (or --force) forces a module unload, and may crash your machine. This requires the Forced Module Removal option when the kernel was compiled. -h (or --help) prints this help text -s (or --syslog) says use syslog, not stderr -v (or --verbose) enables more messages -V (or --version) prints the version code -w (or --wait) begins module removal even if it is used and will stop new users from accessing the module (so it should eventually fall to zero). # modprobe Usage: modprobe [-v] [-V] [-C config-file] [-d ] [-n] [-i] [-q] [-b] [-o ] [ --dump-modversions ] [parameters...] modprobe -r [-n] [-i] [-v] ... modprobe -l -t [ -a ...] # depmod --help depmod 3.13 -- part of module-init-tools depmod -[aA] [-n -e -v -q -V -r -u -w -m] [-b basedirectory] [forced_version] depmod [-n -e -v -q -r -u -w] [-F kernelsyms] module1.ko module2.ko ... If no arguments (except options) are given, "depmod -a" is assumed. depmod will output a dependency list suitable for the modprobe utility. Options: -a, --all Probe all modules -A, --quick Only does the work if there's a new module -e, --errsyms Report not supplied symbols -m, --map Create the legacy map files -n, --show Write the dependency file on stdout only -P, --symbol-prefix Architecture symbol prefix -V, --version Print the release version -v, --verbose Enable verbose mode -w, --warn Warn on duplicates -h, --help Print this usage message The following options are useful for people managing distributions: -b basedirectory --basedir basedirectory Use an image of a module tree -F kernelsyms --filesyms kernelsyms Use the file instead of the current kernel symbols -E Module.symvers --symvers Module.symvers Use Module.symvers file to check symbol versions */ //usage:#if ENABLE_MODPROBE_SMALL //usage:#define depmod_trivial_usage "[-n]" //usage:#define depmod_full_usage "\n\n" //usage: "Generate modules.dep.bb" //usage: "\n" //usage: "\n -n Dry run: print file to stdout" //usage:#define insmod_trivial_usage //usage: "FILE" IF_FEATURE_CMDLINE_MODULE_OPTIONS(" [SYMBOL=VALUE]...") //usage:#define insmod_full_usage "\n\n" //usage: "Load kernel module" //usage:#define rmmod_trivial_usage //usage: "MODULE..." //usage:#define rmmod_full_usage "\n\n" //usage: "Unload kernel modules" //usage:#define modprobe_trivial_usage //usage: "[-rq] MODULE" IF_FEATURE_CMDLINE_MODULE_OPTIONS(" [SYMBOL=VALUE]...") //usage:#define modprobe_full_usage "\n\n" //usage: " -r Remove MODULE" //usage: "\n -q Quiet" //usage:#endif int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int modprobe_main(int argc UNUSED_PARAM, char **argv) { #if ENABLE_MODPROBE || ENABLE_INSMOD || ENABLE_RMMOD int exitcode; #endif struct utsname uts; IF_FEATURE_CMDLINE_MODULE_OPTIONS(char *options = NULL;) INIT_G(); /* Prevent ugly corner cases with no modules at all */ modinfo = xzalloc(sizeof(modinfo[0])); if ((MOD_APPLET_CNT == 2 && ENABLE_DEPMOD && ENABLE_MODPROBE) || is_depmod || is_modprobe ) { /* Goto modules directory */ xchdir(CONFIG_DEFAULT_MODULES_DIR); uname(&uts); /* never fails */ } /* depmod? */ if (is_depmod) { /* Supported: * -n: print result to stdout * -a: process all modules (default) * optional VERSION parameter * Ignored: * -A: do work only if a module is newer than depfile * -e: report any symbols which a module needs * which are not supplied by other modules or the kernel * -F FILE: System.map (symbols for -e) * -q, -r, -u: noop * Not supported: * -b BASEDIR: (TODO!) modules are in * $BASEDIR/lib/modules/$VERSION * -m: create legacy "modules.*map" files (deprecated; in * kmod's depmod, prints a warning message and continues) * -v: human readable deps to stdout * -V: version (don't want to support it - people may depend * on it as an indicator of "standard" depmod) * -h: help (well duh) * module1.o module2.o parameters (just ignored for now) */ getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL); argv += optind; /* if (argv[0] && argv[1]) bb_show_usage(); */ /* Goto $VERSION directory */ xchdir(argv[0] ? argv[0] : uts.release); /* Force full module scan by asking to find a bogus module. * This will generate modules.dep.bb as a side effect. */ process_module((char*)"/", NULL); return !wrote_dep_bb_ok; } #if ENABLE_MODPROBE || ENABLE_INSMOD || ENABLE_RMMOD /* modprobe, insmod, rmmod require at least one argument */ /* only -q (quiet) and -r (rmmod), * the rest are accepted and ignored (compat) */ getopt32(argv, "^" "qrfsvwb" "\0" "-1"); argv += optind; if (is_modprobe) { /* Goto $VERSION directory */ xchdir(uts.release); } /* are we rmmod? -> simulate modprobe -r, but don't bother the flag if * there're no other applets here */ if (is_rmmod) { if (!ONLY_APPLET) option_mask32 |= OPT_r; } else if (!ENABLE_MODPROBE || !(option_mask32 & OPT_r)) { # if ENABLE_FEATURE_CMDLINE_MODULE_OPTIONS /* If not rmmod/-r, parse possible module options given on command line. * insmod/modprobe takes one module name, the rest are parameters. */ char **arg = argv; while (*++arg) { /* Enclose options in quotes */ char *s = options; options = xasprintf("%s \"%s\"", s ? s : "", *arg); free(s); *arg = NULL; } # else argv[1] = NULL; # endif } if (is_insmod) { size_t len; void *map; len = MAXINT(ssize_t); map = xmalloc_open_zipped_read_close(*argv, &len); if (!map) bb_perror_msg_and_die("can't read '%s'", *argv); if (init_module(map, len, (IF_FEATURE_CMDLINE_MODULE_OPTIONS(options ? options : ) "") ) != 0 ) { bb_error_msg_and_die("can't insert '%s': %s", *argv, moderror(errno)); } return EXIT_SUCCESS; } /* Try to load modprobe.dep.bb */ if (!is_rmmod) { load_dep_bb(); } /* Load/remove modules. * Only rmmod/modprobe -r loops here, insmod/modprobe has only argv[0] */ exitcode = EXIT_SUCCESS; do { exitcode |= process_module(*argv, options); } while (*++argv); if (ENABLE_FEATURE_CLEAN_UP) { IF_FEATURE_CMDLINE_MODULE_OPTIONS(free(options);) } return exitcode; #endif /* MODPROBE || INSMOD || RMMOD */ } #endif /* MOD_APPLET_CNT > 0 */