diff options
Diffstat (limited to 'src/shared/module-util.c')
| -rw-r--r-- | src/shared/module-util.c | 125 |
1 files changed, 106 insertions, 19 deletions
diff --git a/src/shared/module-util.c b/src/shared/module-util.c index 951701d..fa1e0f8 100644 --- a/src/shared/module-util.c +++ b/src/shared/module-util.c @@ -6,8 +6,52 @@ #include "proc-cmdline.h" #include "strv.h" +#if HAVE_KMOD + +static void *libkmod_dl = NULL; + +DLSYM_FUNCTION(kmod_list_next); +DLSYM_FUNCTION(kmod_load_resources); +DLSYM_FUNCTION(kmod_module_get_initstate); +DLSYM_FUNCTION(kmod_module_get_module); +DLSYM_FUNCTION(kmod_module_get_name); +DLSYM_FUNCTION(kmod_module_new_from_lookup); +DLSYM_FUNCTION(kmod_module_probe_insert_module); +DLSYM_FUNCTION(kmod_module_unref); +DLSYM_FUNCTION(kmod_module_unref_list); +DLSYM_FUNCTION(kmod_new); +DLSYM_FUNCTION(kmod_set_log_fn); +DLSYM_FUNCTION(kmod_unref); +DLSYM_FUNCTION(kmod_validate_resources); + +int dlopen_libkmod(void) { + ELF_NOTE_DLOPEN("kmod", + "Support for loading kernel modules", + ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED, + "libkmod.so.2"); + + return dlopen_many_sym_or_warn( + &libkmod_dl, + "libkmod.so.2", + LOG_DEBUG, + DLSYM_ARG(kmod_list_next), + DLSYM_ARG(kmod_load_resources), + DLSYM_ARG(kmod_module_get_initstate), + DLSYM_ARG(kmod_module_get_module), + DLSYM_ARG(kmod_module_get_name), + DLSYM_ARG(kmod_module_new_from_lookup), + DLSYM_ARG(kmod_module_probe_insert_module), + DLSYM_ARG(kmod_module_unref), + DLSYM_ARG(kmod_module_unref_list), + DLSYM_ARG(kmod_new), + DLSYM_ARG(kmod_set_log_fn), + DLSYM_ARG(kmod_unref), + DLSYM_ARG(kmod_validate_resources)); +} + static int denylist_modules(const char *p, char ***denylist) { _cleanup_strv_free_ char **k = NULL; + int r; assert(p); assert(denylist); @@ -16,8 +60,9 @@ static int denylist_modules(const char *p, char ***denylist) { if (!k) return -ENOMEM; - if (strv_extend_strv(denylist, k, true) < 0) - return -ENOMEM; + r = strv_extend_strv(denylist, k, /* filter_duplicates= */ true); + if (r < 0) + return r; return 0; } @@ -39,19 +84,21 @@ static int parse_proc_cmdline_item(const char *key, const char *value, void *dat } int module_load_and_warn(struct kmod_ctx *ctx, const char *module, bool verbose) { - const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST; - struct kmod_list *itr; - _cleanup_(kmod_module_unref_listp) struct kmod_list *modlist = NULL; + _cleanup_(sym_kmod_module_unref_listp) struct kmod_list *modlist = NULL; _cleanup_strv_free_ char **denylist = NULL; bool denylist_parsed = false; + struct kmod_list *itr; int r; + assert(ctx); + assert(module); + /* verbose==true means we should log at non-debug level if we * fail to find or load the module. */ log_debug("Loading module: %s", module); - r = kmod_module_new_from_lookup(ctx, module, &modlist); + r = sym_kmod_module_new_from_lookup(ctx, module, &modlist); if (r < 0) return log_full_errno(verbose ? LOG_ERR : LOG_DEBUG, r, "Failed to look up module alias '%s': %m", module); @@ -61,32 +108,37 @@ int module_load_and_warn(struct kmod_ctx *ctx, const char *module, bool verbose) SYNTHETIC_ERRNO(ENOENT), "Failed to find module '%s'", module); - kmod_list_foreach(itr, modlist) { - _cleanup_(kmod_module_unrefp) struct kmod_module *mod = NULL; + sym_kmod_list_foreach(itr, modlist) { + _cleanup_(sym_kmod_module_unrefp) struct kmod_module *mod = NULL; int state, err; - mod = kmod_module_get_module(itr); - state = kmod_module_get_initstate(mod); + mod = sym_kmod_module_get_module(itr); + state = sym_kmod_module_get_initstate(mod); switch (state) { case KMOD_MODULE_BUILTIN: log_full(verbose ? LOG_INFO : LOG_DEBUG, - "Module '%s' is built in", kmod_module_get_name(mod)); + "Module '%s' is built in", sym_kmod_module_get_name(mod)); break; case KMOD_MODULE_LIVE: - log_debug("Module '%s' is already loaded", kmod_module_get_name(mod)); + log_debug("Module '%s' is already loaded", sym_kmod_module_get_name(mod)); break; default: - err = kmod_module_probe_insert_module(mod, probe_flags, - NULL, NULL, NULL, NULL); + err = sym_kmod_module_probe_insert_module( + mod, + KMOD_PROBE_APPLY_BLACKLIST, + /* extra_options= */ NULL, + /* run_install= */ NULL, + /* data= */ NULL, + /* print_action= */ NULL); if (err == 0) log_full(verbose ? LOG_INFO : LOG_DEBUG, - "Inserted module '%s'", kmod_module_get_name(mod)); + "Inserted module '%s'", sym_kmod_module_get_name(mod)); else if (err == KMOD_PROBE_APPLY_BLACKLIST) log_full(verbose ? LOG_INFO : LOG_DEBUG, - "Module '%s' is deny-listed (by kmod)", kmod_module_get_name(mod)); + "Module '%s' is deny-listed (by kmod)", sym_kmod_module_get_name(mod)); else { assert(err < 0); @@ -100,9 +152,9 @@ int module_load_and_warn(struct kmod_ctx *ctx, const char *module, bool verbose) denylist_parsed = true; } - if (strv_contains(denylist, kmod_module_get_name(mod))) { + if (strv_contains(denylist, sym_kmod_module_get_name(mod))) { log_full(verbose ? LOG_INFO : LOG_DEBUG, - "Module '%s' is deny-listed (by kernel)", kmod_module_get_name(mod)); + "Module '%s' is deny-listed (by kernel)", sym_kmod_module_get_name(mod)); continue; } } @@ -113,7 +165,7 @@ int module_load_and_warn(struct kmod_ctx *ctx, const char *module, bool verbose) LOG_ERR, err, "Failed to insert module '%s': %m", - kmod_module_get_name(mod)); + sym_kmod_module_get_name(mod)); if (!IN_SET(err, -ENODEV, -ENOENT)) r = err; } @@ -122,3 +174,38 @@ int module_load_and_warn(struct kmod_ctx *ctx, const char *module, bool verbose) return r; } + +_printf_(6,0) static void systemd_kmod_log( + void *data, + int priority, + const char *file, + int line, + const char *fn, + const char *format, + va_list args) { + + log_internalv(priority, 0, file, line, fn, format, args); +} + +int module_setup_context(struct kmod_ctx **ret) { + _cleanup_(sym_kmod_unrefp) struct kmod_ctx *ctx = NULL; + int r; + + assert(ret); + + r = dlopen_libkmod(); + if (r < 0) + return r; + + ctx = sym_kmod_new(NULL, NULL); + if (!ctx) + return -ENOMEM; + + (void) sym_kmod_load_resources(ctx); + sym_kmod_set_log_fn(ctx, systemd_kmod_log, NULL); + + *ret = TAKE_PTR(ctx); + return 0; +} + +#endif |