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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"
static int denylist_modules(const char *p, char ***denylist) {
_cleanup_strv_free_ char **k = NULL;
assert(p);
assert(denylist);
k = strv_split(p, ",");
if (!k)
return -ENOMEM;
if (strv_extend_strv(denylist, k, true) < 0)
return -ENOMEM;
return 0;
}
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
int r;
if (proc_cmdline_key_streq(key, "module_blacklist")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = denylist_modules(value, data);
if (r < 0)
return r;
}
return 0;
}
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_strv_free_ char **denylist = NULL;
bool denylist_parsed = false;
int r;
/* 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);
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);
kmod_list_foreach(itr, modlist) {
_cleanup_(kmod_module_unrefp) struct kmod_module *mod = NULL;
int state, err;
mod = kmod_module_get_module(itr);
state = 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));
break;
case KMOD_MODULE_LIVE:
log_debug("Module '%s' is already loaded", kmod_module_get_name(mod));
break;
default:
err = kmod_module_probe_insert_module(mod, probe_flags,
NULL, NULL, NULL, NULL);
if (err == 0)
log_full(verbose ? LOG_INFO : LOG_DEBUG,
"Inserted module '%s'", 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));
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, kmod_module_get_name(mod))) {
log_full(verbose ? LOG_INFO : LOG_DEBUG,
"Module '%s' is deny-listed (by kernel)", 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",
kmod_module_get_name(mod));
if (!IN_SET(err, -ENODEV, -ENOENT))
r = err;
}
}
}
return r;
}
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