23624534405

Committed 26 Mar 2026 07:08PM UTC coverage: 72.113% (-0.2%) from 72.361%

Build # 23624534405

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push

github

Committed by

web-flow

Commit Message

Make imds networking unlocked by default (#41359)

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68.18

/src/shared/module-util.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <syslog.h>

#include "sd-dlopen.h"

#include "log.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) {
        SD_ELF_NOTE_DLOPEN(
                        "kmod",
                        "Support for loading kernel modules",
                        SD_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_(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_(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_(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

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <syslog.h>
4
5	#include "sd-dlopen.h"
6
7	#include "log.h"
8	#include "module-util.h"
9	#include "proc-cmdline.h"
10	#include "strv.h"
11
12	#if HAVE_KMOD
13
14	static void *libkmod_dl = NULL;
15
16	DLSYM_PROTOTYPE(kmod_list_next) = NULL;
17	DLSYM_PROTOTYPE(kmod_load_resources) = NULL;
18	DLSYM_PROTOTYPE(kmod_module_get_initstate) = NULL;
19	DLSYM_PROTOTYPE(kmod_module_get_module) = NULL;
20	DLSYM_PROTOTYPE(kmod_module_get_name) = NULL;
21	DLSYM_PROTOTYPE(kmod_module_new_from_lookup) = NULL;
22	DLSYM_PROTOTYPE(kmod_module_probe_insert_module) = NULL;
23	DLSYM_PROTOTYPE(kmod_module_unref) = NULL;
24	DLSYM_PROTOTYPE(kmod_module_unref_list) = NULL;
25	DLSYM_PROTOTYPE(kmod_new) = NULL;
26	DLSYM_PROTOTYPE(kmod_set_log_fn) = NULL;
27	DLSYM_PROTOTYPE(kmod_unref) = NULL;
28	DLSYM_PROTOTYPE(kmod_validate_resources) = NULL;
29
30	int dlopen_libkmod(void) {	263✔
31	SD_ELF_NOTE_DLOPEN(	263✔
32	"kmod",
33	"Support for loading kernel modules",
34	SD_ELF_NOTE_DLOPEN_PRIORITY_RECOMMENDED,
35	"libkmod.so.2");
36
37	return dlopen_many_sym_or_warn(	263✔
38	&libkmod_dl,
39	"libkmod.so.2",
40	LOG_DEBUG,
41	DLSYM_ARG(kmod_list_next),
42	DLSYM_ARG(kmod_load_resources),
43	DLSYM_ARG(kmod_module_get_initstate),
44	DLSYM_ARG(kmod_module_get_module),
45	DLSYM_ARG(kmod_module_get_name),
46	DLSYM_ARG(kmod_module_new_from_lookup),
47	DLSYM_ARG(kmod_module_probe_insert_module),
48	DLSYM_ARG(kmod_module_unref),
49	DLSYM_ARG(kmod_module_unref_list),
50	DLSYM_ARG(kmod_new),
51	DLSYM_ARG(kmod_set_log_fn),
52	DLSYM_ARG(kmod_unref),
53	DLSYM_ARG(kmod_validate_resources));
54	}
55
56	static int parse_proc_cmdline_item(const char key, const char value, void *data) {	×
57	char ***denylist = ASSERT_PTR(data);	×
58	int r;	×
59
60	if (proc_cmdline_key_streq(key, "module_blacklist")) {	×
61
62	if (proc_cmdline_value_missing(key, value))	×
63	return 0;
64
65	r = strv_split_and_extend(denylist, value, ",", /* filter_duplicates= */ true);	×
66	if (r < 0)	×
67	return r;	×
68	}
69
70	return 0;
71	}
72
73	int module_load_and_warn(struct kmod_ctx ctx, const char module, bool verbose) {	4,096✔
74	_cleanup_(kmod_module_unref_listp) struct kmod_list *modlist = NULL;	4,096✔
75	_cleanup_strv_free_ char **denylist = NULL;	4,096✔
76	bool denylist_parsed = false;	4,096✔
77	struct kmod_list *itr;	4,096✔
78	int r;	4,096✔
79
80	assert(ctx);	4,096✔
81	assert(module);	4,096✔
82
83	/* verbose==true means we should log at non-debug level if we
84	* fail to find or load the module. */
85
86	log_debug("Loading module: %s", module);	4,096✔
87
88	r = sym_kmod_module_new_from_lookup(ctx, module, &modlist);	4,096✔
89	if (r < 0)	4,096✔
90	return log_full_errno(verbose ? LOG_ERR : LOG_DEBUG, r,	×
91	"Failed to look up module alias '%s': %m", module);
92
93	if (!modlist)	4,096✔
94	return log_full_errno(verbose ? LOG_ERR : LOG_DEBUG,	1,533✔
95	SYNTHETIC_ERRNO(ENOENT),
96	"Failed to find module '%s'", module);
97
98	sym_kmod_list_foreach(itr, modlist) {	6,290✔
99	_cleanup_(kmod_module_unrefp) struct kmod_module *mod = NULL;	3,727✔
100	int state, err;	3,727✔
101
102	mod = sym_kmod_module_get_module(itr);	3,727✔
103	state = sym_kmod_module_get_initstate(mod);	3,727✔
104
105	switch (state) {	3,727✔
106	case KMOD_MODULE_BUILTIN:
107	log_full(verbose ? LOG_INFO : LOG_DEBUG,	1,672✔
108	"Module '%s' is built in", sym_kmod_module_get_name(mod));
109	break;
110
111	case KMOD_MODULE_LIVE:
112	log_debug("Module '%s' is already loaded", sym_kmod_module_get_name(mod));	579✔
113	break;
114
115	default:	1,476✔
116	err = sym_kmod_module_probe_insert_module(	1,476✔
117	mod,
118	KMOD_PROBE_APPLY_BLACKLIST,
119	/* extra_options= */ NULL,
120	/* run_install= */ NULL,
121	/* data= */ NULL,
122	/* print_action= */ NULL);
123	if (err == 0)	1,476✔
124	log_full(verbose ? LOG_INFO : LOG_DEBUG,	1,153✔
125	"Inserted module '%s'", sym_kmod_module_get_name(mod));
126	else if (err == KMOD_PROBE_APPLY_BLACKLIST)	323✔
127	log_full(verbose ? LOG_INFO : LOG_DEBUG,	×
128	"Module '%s' is deny-listed (by kmod)", sym_kmod_module_get_name(mod));
129	else {
130	assert(err < 0);	323✔
131
132	if (err == -EPERM) {	323✔
133	if (!denylist_parsed) {	×
134	r = proc_cmdline_parse(parse_proc_cmdline_item, &denylist, 0);	×
135	if (r < 0)	×
136	log_full_errno(!verbose ? LOG_DEBUG : LOG_WARNING,	×
137	r,
138	"Failed to parse kernel command line, ignoring: %m");
139
140	denylist_parsed = true;
141	}
142	if (strv_contains(denylist, sym_kmod_module_get_name(mod))) {	×
143	log_full(verbose ? LOG_INFO : LOG_DEBUG,	×
144	"Module '%s' is deny-listed (by kernel)", sym_kmod_module_get_name(mod));
145	continue;	×
146	}
147	}
148
149	log_full_errno(!verbose ? LOG_DEBUG :	323✔
150	err == -ENODEV ? LOG_NOTICE :
151	err == -ENOENT ? LOG_WARNING :
152	LOG_ERR,
153	err,
154	"Failed to insert module '%s': %m",
155	sym_kmod_module_get_name(mod));
156	if (!IN_SET(err, -ENODEV, -ENOENT))	323✔
157	r = err;	×
158	}
159	}
160	}
161
162	return r;
163	}
164
165	_printf_(6,0) static void systemd_kmod_log(	×
166	void *data,
167	int priority,
168	const char *file,
169	int line,
170	const char *fn,
171	const char *format,
172	va_list args) {
173
174	log_internalv(priority, 0, file, line, fn, format, args);	×
175	}	×
176
177	int module_setup_context(struct kmod_ctx **ret) {	204✔
178	_cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL;	204✔
179	int r;	204✔
180
181	assert(ret);	204✔
182
183	r = dlopen_libkmod();	204✔
184	if (r < 0)	204✔
185	return r;
186
187	ctx = sym_kmod_new(NULL, NULL);	204✔
188	if (!ctx)	204✔
189	return -ENOMEM;
190
191	(void) sym_kmod_load_resources(ctx);	204✔
192	sym_kmod_set_log_fn(ctx, systemd_kmod_log, NULL);	204✔
193
194	*ret = TAKE_PTR(ctx);	204✔
195	return 0;	204✔
196	}
197
198	#endif

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