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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include "module-util.h"
#include "proc-cmdline.h"
#include "strv.h"
#if HAVE_KMOD
static void *libkmod_dl = NULL;
DLSYM_PROTOTYPE(kmod_list_next) = NULL;
DLSYM_PROTOTYPE(kmod_load_resources) = NULL;
DLSYM_PROTOTYPE(kmod_module_get_initstate) = NULL;
DLSYM_PROTOTYPE(kmod_module_get_module) = NULL;
DLSYM_PROTOTYPE(kmod_module_get_name) = NULL;
DLSYM_PROTOTYPE(kmod_module_new_from_lookup) = NULL;
DLSYM_PROTOTYPE(kmod_module_probe_insert_module) = NULL;
DLSYM_PROTOTYPE(kmod_module_unref) = NULL;
DLSYM_PROTOTYPE(kmod_module_unref_list) = NULL;
DLSYM_PROTOTYPE(kmod_new) = NULL;
DLSYM_PROTOTYPE(kmod_set_log_fn) = NULL;
DLSYM_PROTOTYPE(kmod_unref) = NULL;
DLSYM_PROTOTYPE(kmod_validate_resources) = NULL;
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 parse_proc_cmdline_item(const char *key, const char *value, void *data) {
char ***denylist = ASSERT_PTR(data);
int r;
if (proc_cmdline_key_streq(key, "module_blacklist")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = strv_split_and_extend(denylist, value, ",", /* filter_duplicates = */ true);
if (r < 0)
return r;
}
return 0;
}
int module_load_and_warn(struct kmod_ctx *ctx, const char *module, bool verbose) {
_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 = 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);
if (!modlist)
return log_full_errno(verbose ? LOG_ERR : LOG_DEBUG,
SYNTHETIC_ERRNO(ENOENT),
"Failed to find module '%s'", module);
sym_kmod_list_foreach(itr, modlist) {
_cleanup_(sym_kmod_module_unrefp) struct kmod_module *mod = NULL;
int state, err;
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", sym_kmod_module_get_name(mod));
break;
case KMOD_MODULE_LIVE:
log_debug("Module '%s' is already loaded", sym_kmod_module_get_name(mod));
break;
default:
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'", 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)", sym_kmod_module_get_name(mod));
else {
assert(err < 0);
if (err == -EPERM) {
if (!denylist_parsed) {
r = proc_cmdline_parse(parse_proc_cmdline_item, &denylist, 0);
if (r < 0)
log_full_errno(!verbose ? LOG_DEBUG : LOG_WARNING,
r,
"Failed to parse kernel command line, ignoring: %m");
denylist_parsed = true;
}
if (strv_contains(denylist, sym_kmod_module_get_name(mod))) {
log_full(verbose ? LOG_INFO : LOG_DEBUG,
"Module '%s' is deny-listed (by kernel)", sym_kmod_module_get_name(mod));
continue;
}
}
log_full_errno(!verbose ? LOG_DEBUG :
err == -ENODEV ? LOG_NOTICE :
err == -ENOENT ? LOG_WARNING :
LOG_ERR,
err,
"Failed to insert module '%s': %m",
sym_kmod_module_get_name(mod));
if (!IN_SET(err, -ENODEV, -ENOENT))
r = err;
}
}
}
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
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