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-rw-r--r--src/shared/module-util.c125
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