1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* Copyright (C) 2002 Richard Henderson
4	* Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
5	* Copyright (C) 2023 Luis Chamberlain <mcgrof@kernel.org>
6	*/
7
8	#define INCLUDE_VERMAGIC
9
10	#include <linux/export.h>
11	#include <linux/extable.h>
12	#include <linux/moduleloader.h>
13	#include <linux/module_signature.h>
14	#include <linux/trace_events.h>
15	#include <linux/init.h>
16	#include <linux/kallsyms.h>
17	#include <linux/buildid.h>
18	#include <linux/fs.h>
19	#include <linux/kernel.h>
20	#include <linux/kernel_read_file.h>
21	#include <linux/kstrtox.h>
22	#include <linux/slab.h>
23	#include <linux/vmalloc.h>
24	#include <linux/elf.h>
25	#include <linux/seq_file.h>
26	#include <linux/syscalls.h>
27	#include <linux/fcntl.h>
28	#include <linux/rcupdate.h>
29	#include <linux/capability.h>
30	#include <linux/cpu.h>
31	#include <linux/moduleparam.h>
32	#include <linux/errno.h>
33	#include <linux/err.h>
34	#include <linux/vermagic.h>
35	#include <linux/notifier.h>
36	#include <linux/sched.h>
37	#include <linux/device.h>
38	#include <linux/string.h>
39	#include <linux/mutex.h>
40	#include <linux/rculist.h>
41	#include <linux/uaccess.h>
42	#include <asm/cacheflush.h>
43	#include <linux/set_memory.h>
44	#include <asm/mmu_context.h>
45	#include <linux/license.h>
46	#include <asm/sections.h>
47	#include <linux/tracepoint.h>
48	#include <linux/ftrace.h>
49	#include <linux/livepatch.h>
50	#include <linux/async.h>
51	#include <linux/percpu.h>
52	#include <linux/kmemleak.h>
53	#include <linux/jump_label.h>
54	#include <linux/pfn.h>
55	#include <linux/bsearch.h>
56	#include <linux/dynamic_debug.h>
57	#include <linux/audit.h>
58	#include <linux/cfi.h>
59	#include <linux/debugfs.h>
60	#include <uapi/linux/module.h>
61	#include "internal.h"
62
63	#define CREATE_TRACE_POINTS
64	#include <trace/events/module.h>
65
66	/*
67	* Mutex protects:
68	* 1) List of modules (also safely readable with preempt_disable),
69	* 2) module_use links,
70	* 3) mod_tree.addr_min/mod_tree.addr_max.
71	* (delete and add uses RCU list operations).
72	*/
73	DEFINE_MUTEX(module_mutex);
74	LIST_HEAD(modules);
75
76	/* Work queue for freeing init sections in success case */
77	static void do_free_init(struct work_struct *w);
78	static DECLARE_WORK(init_free_wq, do_free_init);
79	static LLIST_HEAD(init_free_list);
80
81	struct mod_tree_root mod_tree __cacheline_aligned = {
82	.addr_min = -1UL,
83	};
84
85	struct symsearch {
86	const struct kernel_symbol *start, *stop;
87	const s32 *crcs;
88	enum mod_license license;
89	};
90
91	/*
92	* Bounds of module memory, for speeding up __module_address.
93	* Protected by module_mutex.
94	*/
95	static void __mod_update_bounds(enum mod_mem_type type __maybe_unused, void *base,
96	unsigned int size, struct mod_tree_root *tree)
97	{
98	unsigned long min = (unsigned long)base;
99	unsigned long max = min + size;
100
101	#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
102	if (mod_mem_type_is_core_data(type)) {
103	if (min < tree->data_addr_min)
104	tree->data_addr_min = min;
105	if (max > tree->data_addr_max)
106	tree->data_addr_max = max;
107	return;
108	}
109	#endif
110	if (min < tree->addr_min)
111	tree->addr_min = min;
112	if (max > tree->addr_max)
113	tree->addr_max = max;
114	}
115
116	static void mod_update_bounds(struct module *mod)
117	{
118	for_each_mod_mem_type(type) {
119	struct module_memory *mod_mem = &mod->mem[type];
120
121	if (mod_mem->size)
122	__mod_update_bounds(type, base: mod_mem->base, size: mod_mem->size, tree: &mod_tree);
123	}
124	}
125
126	/* Block module loading/unloading? */
127	int modules_disabled;
128	core_param(nomodule, modules_disabled, bint, 0);
129
130	/* Waiting for a module to finish initializing? */
131	static DECLARE_WAIT_QUEUE_HEAD(module_wq);
132
133	static BLOCKING_NOTIFIER_HEAD(module_notify_list);
134
135	int register_module_notifier(struct notifier_block *nb)
136	{
137	return blocking_notifier_chain_register(nh: &module_notify_list, nb);
138	}
139	EXPORT_SYMBOL(register_module_notifier);
140
141	int unregister_module_notifier(struct notifier_block *nb)
142	{
143	return blocking_notifier_chain_unregister(nh: &module_notify_list, nb);
144	}
145	EXPORT_SYMBOL(unregister_module_notifier);
146
147	/*
148	* We require a truly strong try_module_get(): 0 means success.
149	* Otherwise an error is returned due to ongoing or failed
150	* initialization etc.
151	*/
152	static inline int strong_try_module_get(struct module *mod)
153	{
154	BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
155	if (mod && mod->state == MODULE_STATE_COMING)
156	return -EBUSY;
157	if (try_module_get(module: mod))
158	return 0;
159	else
160	return -ENOENT;
161	}
162
163	static inline void add_taint_module(struct module *mod, unsigned flag,
164	enum lockdep_ok lockdep_ok)
165	{
166	add_taint(flag, lockdep_ok);
167	set_bit(nr: flag, addr: &mod->taints);
168	}
169
170	/*
171	* A thread that wants to hold a reference to a module only while it
172	* is running can call this to safely exit.
173	*/
174	void __noreturn __module_put_and_kthread_exit(struct module *mod, long code)
175	{
176	module_put(module: mod);
177	kthread_exit(result: code);
178	}
179	EXPORT_SYMBOL(__module_put_and_kthread_exit);
180
181	/* Find a module section: 0 means not found. */
182	static unsigned int find_sec(const struct load_info *info, const char *name)
183	{
184	unsigned int i;
185
186	for (i = 1; i < info->hdr->e_shnum; i++) {
187	Elf_Shdr *shdr = &info->sechdrs[i];
188	/* Alloc bit cleared means "ignore it." */
189	if ((shdr->sh_flags & SHF_ALLOC)
190	&& strcmp(info->secstrings + shdr->sh_name, name) == 0)
191	return i;
192	}
193	return 0;
194	}
195
196	/* Find a module section, or NULL. */
197	static void *section_addr(const struct load_info *info, const char *name)
198	{
199	/* Section 0 has sh_addr 0. */
200	return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
201	}
202
203	/* Find a module section, or NULL. Fill in number of "objects" in section. */
204	static void *section_objs(const struct load_info *info,
205	const char *name,
206	size_t object_size,
207	unsigned int *num)
208	{
209	unsigned int sec = find_sec(info, name);
210
211	/* Section 0 has sh_addr 0 and sh_size 0. */
212	*num = info->sechdrs[sec].sh_size / object_size;
213	return (void *)info->sechdrs[sec].sh_addr;
214	}
215
216	/* Find a module section: 0 means not found. Ignores SHF_ALLOC flag. */
217	static unsigned int find_any_sec(const struct load_info *info, const char *name)
218	{
219	unsigned int i;
220
221	for (i = 1; i < info->hdr->e_shnum; i++) {
222	Elf_Shdr *shdr = &info->sechdrs[i];
223	if (strcmp(info->secstrings + shdr->sh_name, name) == 0)
224	return i;
225	}
226	return 0;
227	}
228
229	/*
230	* Find a module section, or NULL. Fill in number of "objects" in section.
231	* Ignores SHF_ALLOC flag.
232	*/
233	static __maybe_unused void *any_section_objs(const struct load_info *info,
234	const char *name,
235	size_t object_size,
236	unsigned int *num)
237	{
238	unsigned int sec = find_any_sec(info, name);
239
240	/* Section 0 has sh_addr 0 and sh_size 0. */
241	*num = info->sechdrs[sec].sh_size / object_size;
242	return (void *)info->sechdrs[sec].sh_addr;
243	}
244
245	#ifndef CONFIG_MODVERSIONS
246	#define symversion(base, idx) NULL
247	#else
248	#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
249	#endif
250
251	static const char *kernel_symbol_name(const struct kernel_symbol *sym)
252	{
253	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
254	return offset_to_ptr(off: &sym->name_offset);
255	#else
256	return sym->name;
257	#endif
258	}
259
260	static const char *kernel_symbol_namespace(const struct kernel_symbol *sym)
261	{
262	#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
263	if (!sym->namespace_offset)
264	return NULL;
265	return offset_to_ptr(off: &sym->namespace_offset);
266	#else
267	return sym->namespace;
268	#endif
269	}
270
271	int cmp_name(const void *name, const void *sym)
272	{
273	return strcmp(name, kernel_symbol_name(sym));
274	}
275
276	static bool find_exported_symbol_in_section(const struct symsearch *syms,
277	struct module *owner,
278	struct find_symbol_arg *fsa)
279	{
280	struct kernel_symbol *sym;
281
282	if (!fsa->gplok && syms->license == GPL_ONLY)
283	return false;
284
285	sym = bsearch(key: fsa->name, base: syms->start, num: syms->stop - syms->start,
286	size: sizeof(struct kernel_symbol), cmp: cmp_name);
287	if (!sym)
288	return false;
289
290	fsa->owner = owner;
291	fsa->crc = symversion(syms->crcs, sym - syms->start);
292	fsa->sym = sym;
293	fsa->license = syms->license;
294
295	return true;
296	}
297
298	/*
299	* Find an exported symbol and return it, along with, (optional) crc and
300	* (optional) module which owns it. Needs preempt disabled or module_mutex.
301	*/
302	bool find_symbol(struct find_symbol_arg *fsa)
303	{
304	static const struct symsearch arr[] = {
305	{ __start___ksymtab, __stop___ksymtab, __start___kcrctab,
306	NOT_GPL_ONLY },
307	{ __start___ksymtab_gpl, __stop___ksymtab_gpl,
308	__start___kcrctab_gpl,
309	GPL_ONLY },
310	};
311	struct module *mod;
312	unsigned int i;
313
314	module_assert_mutex_or_preempt();
315
316	for (i = 0; i < ARRAY_SIZE(arr); i++)
317	if (find_exported_symbol_in_section(syms: &arr[i], NULL, fsa))
318	return true;
319
320	list_for_each_entry_rcu(mod, &modules, list,
321	lockdep_is_held(&module_mutex)) {
322	struct symsearch arr[] = {
323	{ mod->syms, mod->syms + mod->num_syms, mod->crcs,
324	NOT_GPL_ONLY },
325	{ mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
326	mod->gpl_crcs,
327	GPL_ONLY },
328	};
329
330	if (mod->state == MODULE_STATE_UNFORMED)
331	continue;
332
333	for (i = 0; i < ARRAY_SIZE(arr); i++)
334	if (find_exported_symbol_in_section(syms: &arr[i], owner: mod, fsa))
335	return true;
336	}
337
338	pr_debug("Failed to find symbol %s\n", fsa->name);
339	return false;
340	}
341
342	/*
343	* Search for module by name: must hold module_mutex (or preempt disabled
344	* for read-only access).
345	*/
346	struct module *find_module_all(const char *name, size_t len,
347	bool even_unformed)
348	{
349	struct module *mod;
350
351	module_assert_mutex_or_preempt();
352
353	list_for_each_entry_rcu(mod, &modules, list,
354	lockdep_is_held(&module_mutex)) {
355	if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
356	continue;
357	if (strlen(mod->name) == len && !memcmp(p: mod->name, q: name, size: len))
358	return mod;
359	}
360	return NULL;
361	}
362
363	struct module *find_module(const char *name)
364	{
365	return find_module_all(name, strlen(name), even_unformed: false);
366	}
367
368	#ifdef CONFIG_SMP
369
370	static inline void __percpu *mod_percpu(struct module *mod)
371	{
372	return mod->percpu;
373	}
374
375	static int percpu_modalloc(struct module *mod, struct load_info *info)
376	{
377	Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu];
378	unsigned long align = pcpusec->sh_addralign;
379
380	if (!pcpusec->sh_size)
381	return 0;
382
383	if (align > PAGE_SIZE) {
384	pr_warn("%s: per-cpu alignment %li > %li\n",
385	mod->name, align, PAGE_SIZE);
386	align = PAGE_SIZE;
387	}
388
389	mod->percpu = __alloc_reserved_percpu(size: pcpusec->sh_size, align);
390	if (!mod->percpu) {
391	pr_warn("%s: Could not allocate %lu bytes percpu data\n",
392	mod->name, (unsigned long)pcpusec->sh_size);
393	return -ENOMEM;
394	}
395	mod->percpu_size = pcpusec->sh_size;
396	return 0;
397	}
398
399	static void percpu_modfree(struct module *mod)
400	{
401	free_percpu(pdata: mod->percpu);
402	}
403
404	static unsigned int find_pcpusec(struct load_info *info)
405	{
406	return find_sec(info, name: ".data..percpu");
407	}
408
409	static void percpu_modcopy(struct module *mod,
410	const void *from, unsigned long size)
411	{
412	int cpu;
413
414	for_each_possible_cpu(cpu)
415	memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
416	}
417
418	bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
419	{
420	struct module *mod;
421	unsigned int cpu;
422
423	preempt_disable();
424
425	list_for_each_entry_rcu(mod, &modules, list) {
426	if (mod->state == MODULE_STATE_UNFORMED)
427	continue;
428	if (!mod->percpu_size)
429	continue;
430	for_each_possible_cpu(cpu) {
431	void *start = per_cpu_ptr(mod->percpu, cpu);
432	void *va = (void *)addr;
433
434	if (va >= start && va < start + mod->percpu_size) {
435	if (can_addr) {
436	*can_addr = (unsigned long) (va - start);
437	*can_addr += (unsigned long)
438	per_cpu_ptr(mod->percpu,
439	get_boot_cpu_id());
440	}
441	preempt_enable();
442	return true;
443	}
444	}
445	}
446
447	preempt_enable();
448	return false;
449	}
450
451	/**
452	* is_module_percpu_address() - test whether address is from module static percpu
453	* @addr: address to test
454	*
455	* Test whether @addr belongs to module static percpu area.
456	*
457	* Return: %true if @addr is from module static percpu area
458	*/
459	bool is_module_percpu_address(unsigned long addr)
460	{
461	return __is_module_percpu_address(addr, NULL);
462	}
463
464	#else /* ... !CONFIG_SMP */
465
466	static inline void __percpu *mod_percpu(struct module *mod)
467	{
468	return NULL;
469	}
470	static int percpu_modalloc(struct module *mod, struct load_info *info)
471	{
472	/* UP modules shouldn't have this section: ENOMEM isn't quite right */
473	if (info->sechdrs[info->index.pcpu].sh_size != 0)
474	return -ENOMEM;
475	return 0;
476	}
477	static inline void percpu_modfree(struct module *mod)
478	{
479	}
480	static unsigned int find_pcpusec(struct load_info *info)
481	{
482	return 0;
483	}
484	static inline void percpu_modcopy(struct module *mod,
485	const void *from, unsigned long size)
486	{
487	/* pcpusec should be 0, and size of that section should be 0. */
488	BUG_ON(size != 0);
489	}
490	bool is_module_percpu_address(unsigned long addr)
491	{
492	return false;
493	}
494
495	bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
496	{
497	return false;
498	}
499
500	#endif /* CONFIG_SMP */
501
502	#define MODINFO_ATTR(field) \
503	static void setup_modinfo_##field(struct module *mod, const char *s) \
504	{ \
505	mod->field = kstrdup(s, GFP_KERNEL); \
506	} \
507	static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
508	struct module_kobject *mk, char *buffer) \
509	{ \
510	return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
511	} \
512	static int modinfo_##field##_exists(struct module *mod) \
513	{ \
514	return mod->field != NULL; \
515	} \
516	static void free_modinfo_##field(struct module *mod) \
517	{ \
518	kfree(mod->field); \
519	mod->field = NULL; \
520	} \
521	static struct module_attribute modinfo_##field = { \
522	.attr = { .name = __stringify(field), .mode = 0444 }, \
523	.show = show_modinfo_##field, \
524	.setup = setup_modinfo_##field, \
525	.test = modinfo_##field##_exists, \
526	.free = free_modinfo_##field, \
527	};
528
529	MODINFO_ATTR(version);
530	MODINFO_ATTR(srcversion);
531
532	static struct {
533	char name[MODULE_NAME_LEN + 1];
534	char taints[MODULE_FLAGS_BUF_SIZE];
535	} last_unloaded_module;
536
537	#ifdef CONFIG_MODULE_UNLOAD
538
539	EXPORT_TRACEPOINT_SYMBOL(module_get);
540
541	/* MODULE_REF_BASE is the base reference count by kmodule loader. */
542	#define MODULE_REF_BASE 1
543
544	/* Init the unload section of the module. */
545	static int module_unload_init(struct module *mod)
546	{
547	/*
548	* Initialize reference counter to MODULE_REF_BASE.
549	* refcnt == 0 means module is going.
550	*/
551	atomic_set(v: &mod->refcnt, MODULE_REF_BASE);
552
553	INIT_LIST_HEAD(list: &mod->source_list);
554	INIT_LIST_HEAD(list: &mod->target_list);
555
556	/* Hold reference count during initialization. */
557	atomic_inc(v: &mod->refcnt);
558
559	return 0;
560	}
561
562	/* Does a already use b? */
563	static int already_uses(struct module *a, struct module *b)
564	{
565	struct module_use *use;
566
567	list_for_each_entry(use, &b->source_list, source_list) {
568	if (use->source == a)
569	return 1;
570	}
571	pr_debug("%s does not use %s!\n", a->name, b->name);
572	return 0;
573	}
574
575	/*
576	* Module a uses b
577	* - we add 'a' as a "source", 'b' as a "target" of module use
578	* - the module_use is added to the list of 'b' sources (so
579	* 'b' can walk the list to see who sourced them), and of 'a'
580	* targets (so 'a' can see what modules it targets).
581	*/
582	static int add_module_usage(struct module *a, struct module *b)
583	{
584	struct module_use *use;
585
586	pr_debug("Allocating new usage for %s.\n", a->name);
587	use = kmalloc(size: sizeof(*use), GFP_ATOMIC);
588	if (!use)
589	return -ENOMEM;
590
591	use->source = a;
592	use->target = b;
593	list_add(new: &use->source_list, head: &b->source_list);
594	list_add(new: &use->target_list, head: &a->target_list);
595	return 0;
596	}
597
598	/* Module a uses b: caller needs module_mutex() */
599	static int ref_module(struct module *a, struct module *b)
600	{
601	int err;
602
603	if (b == NULL || already_uses(a, b))
604	return 0;
605
606	/* If module isn't available, we fail. */
607	err = strong_try_module_get(mod: b);
608	if (err)
609	return err;
610
611	err = add_module_usage(a, b);
612	if (err) {
613	module_put(module: b);
614	return err;
615	}
616	return 0;
617	}
618
619	/* Clear the unload stuff of the module. */
620	static void module_unload_free(struct module *mod)
621	{
622	struct module_use *use, *tmp;
623
624	mutex_lock(&module_mutex);
625	list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
626	struct module *i = use->target;
627	pr_debug("%s unusing %s\n", mod->name, i->name);
628	module_put(module: i);
629	list_del(entry: &use->source_list);
630	list_del(entry: &use->target_list);
631	kfree(objp: use);
632	}
633	mutex_unlock(lock: &module_mutex);
634	}
635
636	#ifdef CONFIG_MODULE_FORCE_UNLOAD
637	static inline int try_force_unload(unsigned int flags)
638	{
639	int ret = (flags & O_TRUNC);
640	if (ret)
641	add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
642	return ret;
643	}
644	#else
645	static inline int try_force_unload(unsigned int flags)
646	{
647	return 0;
648	}
649	#endif /* CONFIG_MODULE_FORCE_UNLOAD */
650
651	/* Try to release refcount of module, 0 means success. */
652	static int try_release_module_ref(struct module *mod)
653	{
654	int ret;
655
656	/* Try to decrement refcnt which we set at loading */
657	ret = atomic_sub_return(MODULE_REF_BASE, v: &mod->refcnt);
658	BUG_ON(ret < 0);
659	if (ret)
660	/* Someone can put this right now, recover with checking */
661	ret = atomic_add_unless(v: &mod->refcnt, MODULE_REF_BASE, u: 0);
662
663	return ret;
664	}
665
666	static int try_stop_module(struct module *mod, int flags, int *forced)
667	{
668	/* If it's not unused, quit unless we're forcing. */
669	if (try_release_module_ref(mod) != 0) {
670	*forced = try_force_unload(flags);
671	if (!(*forced))
672	return -EWOULDBLOCK;
673	}
674
675	/* Mark it as dying. */
676	mod->state = MODULE_STATE_GOING;
677
678	return 0;
679	}
680
681	/**
682	* module_refcount() - return the refcount or -1 if unloading
683	* @mod: the module we're checking
684	*
685	* Return:
686	* -1 if the module is in the process of unloading
687	* otherwise the number of references in the kernel to the module
688	*/
689	int module_refcount(struct module *mod)
690	{
691	return atomic_read(v: &mod->refcnt) - MODULE_REF_BASE;
692	}
693	EXPORT_SYMBOL(module_refcount);
694
695	/* This exists whether we can unload or not */
696	static void free_module(struct module *mod);
697
698	SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
699	unsigned int, flags)
700	{
701	struct module *mod;
702	char name[MODULE_NAME_LEN];
703	char buf[MODULE_FLAGS_BUF_SIZE];
704	int ret, forced = 0;
705
706	if (!capable(CAP_SYS_MODULE) || modules_disabled)
707	return -EPERM;
708
709	if (strncpy_from_user(dst: name, src: name_user, MODULE_NAME_LEN-1) < 0)
710	return -EFAULT;
711	name[MODULE_NAME_LEN-1] = '\0';
712
713	audit_log_kern_module(name);
714
715	if (mutex_lock_interruptible(&module_mutex) != 0)
716	return -EINTR;
717
718	mod = find_module(name);
719	if (!mod) {
720	ret = -ENOENT;
721	goto out;
722	}
723
724	if (!list_empty(head: &mod->source_list)) {
725	/* Other modules depend on us: get rid of them first. */
726	ret = -EWOULDBLOCK;
727	goto out;
728	}
729
730	/* Doing init or already dying? */
731	if (mod->state != MODULE_STATE_LIVE) {
732	/* FIXME: if (force), slam module count damn the torpedoes */
733	pr_debug("%s already dying\n", mod->name);
734	ret = -EBUSY;
735	goto out;
736	}
737
738	/* If it has an init func, it must have an exit func to unload */
739	if (mod->init && !mod->exit) {
740	forced = try_force_unload(flags);
741	if (!forced) {
742	/* This module can't be removed */
743	ret = -EBUSY;
744	goto out;
745	}
746	}
747
748	ret = try_stop_module(mod, flags, forced: &forced);
749	if (ret != 0)
750	goto out;
751
752	mutex_unlock(lock: &module_mutex);
753	/* Final destruction now no one is using it. */
754	if (mod->exit != NULL)
755	mod->exit();
756	blocking_notifier_call_chain(nh: &module_notify_list,
757	val: MODULE_STATE_GOING, v: mod);
758	klp_module_going(mod);
759	ftrace_release_mod(mod);
760
761	async_synchronize_full();
762
763	/* Store the name and taints of the last unloaded module for diagnostic purposes */
764	strscpy(last_unloaded_module.name, mod->name, sizeof(last_unloaded_module.name));
765	strscpy(last_unloaded_module.taints, module_flags(mod, buf, false), sizeof(last_unloaded_module.taints));
766
767	free_module(mod);
768	/* someone could wait for the module in add_unformed_module() */
769	wake_up_all(&module_wq);
770	return 0;
771	out:
772	mutex_unlock(lock: &module_mutex);
773	return ret;
774	}
775
776	void __symbol_put(const char *symbol)
777	{
778	struct find_symbol_arg fsa = {
779	.name = symbol,
780	.gplok = true,
781	};
782
783	preempt_disable();
784	BUG_ON(!find_symbol(&fsa));
785	module_put(module: fsa.owner);
786	preempt_enable();
787	}
788	EXPORT_SYMBOL(__symbol_put);
789
790	/* Note this assumes addr is a function, which it currently always is. */
791	void symbol_put_addr(void *addr)
792	{
793	struct module *modaddr;
794	unsigned long a = (unsigned long)dereference_function_descriptor(addr);
795
796	if (core_kernel_text(addr: a))
797	return;
798
799	/*
800	* Even though we hold a reference on the module; we still need to
801	* disable preemption in order to safely traverse the data structure.
802	*/
803	preempt_disable();
804	modaddr = __module_text_address(addr: a);
805	BUG_ON(!modaddr);
806	module_put(module: modaddr);
807	preempt_enable();
808	}
809	EXPORT_SYMBOL_GPL(symbol_put_addr);
810
811	static ssize_t show_refcnt(struct module_attribute *mattr,
812	struct module_kobject *mk, char *buffer)
813	{
814	return sprintf(buf: buffer, fmt: "%i\n", module_refcount(mk->mod));
815	}
816
817	static struct module_attribute modinfo_refcnt =
818	__ATTR(refcnt, 0444, show_refcnt, NULL);
819
820	void __module_get(struct module *module)
821	{
822	if (module) {
823	atomic_inc(v: &module->refcnt);
824	trace_module_get(mod: module, _RET_IP_);
825	}
826	}
827	EXPORT_SYMBOL(__module_get);
828
829	bool try_module_get(struct module *module)
830	{
831	bool ret = true;
832
833	if (module) {
834	/* Note: here, we can fail to get a reference */
835	if (likely(module_is_live(module) &&
836	atomic_inc_not_zero(&module->refcnt) != 0))
837	trace_module_get(mod: module, _RET_IP_);
838	else
839	ret = false;
840	}
841	return ret;
842	}
843	EXPORT_SYMBOL(try_module_get);
844
845	void module_put(struct module *module)
846	{
847	int ret;
848
849	if (module) {
850	ret = atomic_dec_if_positive(v: &module->refcnt);
851	WARN_ON(ret < 0); /* Failed to put refcount */
852	trace_module_put(mod: module, _RET_IP_);
853	}
854	}
855	EXPORT_SYMBOL(module_put);
856
857	#else /* !CONFIG_MODULE_UNLOAD */
858	static inline void module_unload_free(struct module *mod)
859	{
860	}
861
862	static int ref_module(struct module *a, struct module *b)
863	{
864	return strong_try_module_get(b);
865	}
866
867	static inline int module_unload_init(struct module *mod)
868	{
869	return 0;
870	}
871	#endif /* CONFIG_MODULE_UNLOAD */
872
873	size_t module_flags_taint(unsigned long taints, char *buf)
874	{
875	size_t l = 0;
876	int i;
877
878	for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
879	if (taint_flags[i].module && test_bit(i, &taints))
880	buf[l++] = taint_flags[i].c_true;
881	}
882
883	return l;
884	}
885
886	static ssize_t show_initstate(struct module_attribute *mattr,
887	struct module_kobject *mk, char *buffer)
888	{
889	const char *state = "unknown";
890
891	switch (mk->mod->state) {
892	case MODULE_STATE_LIVE:
893	state = "live";
894	break;
895	case MODULE_STATE_COMING:
896	state = "coming";
897	break;
898	case MODULE_STATE_GOING:
899	state = "going";
900	break;
901	default:
902	BUG();
903	}
904	return sprintf(buf: buffer, fmt: "%s\n", state);
905	}
906
907	static struct module_attribute modinfo_initstate =
908	__ATTR(initstate, 0444, show_initstate, NULL);
909
910	static ssize_t store_uevent(struct module_attribute *mattr,
911	struct module_kobject *mk,
912	const char *buffer, size_t count)
913	{
914	int rc;
915
916	rc = kobject_synth_uevent(kobj: &mk->kobj, buf: buffer, count);
917	return rc ? rc : count;
918	}
919
920	struct module_attribute module_uevent =
921	__ATTR(uevent, 0200, NULL, store_uevent);
922
923	static ssize_t show_coresize(struct module_attribute *mattr,
924	struct module_kobject *mk, char *buffer)
925	{
926	unsigned int size = mk->mod->mem[MOD_TEXT].size;
927
928	if (!IS_ENABLED(CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC)) {
929	for_class_mod_mem_type(type, core_data)
930	size += mk->mod->mem[type].size;
931	}
932	return sprintf(buf: buffer, fmt: "%u\n", size);
933	}
934
935	static struct module_attribute modinfo_coresize =
936	__ATTR(coresize, 0444, show_coresize, NULL);
937
938	#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
939	static ssize_t show_datasize(struct module_attribute *mattr,
940	struct module_kobject *mk, char *buffer)
941	{
942	unsigned int size = 0;
943
944	for_class_mod_mem_type(type, core_data)
945	size += mk->mod->mem[type].size;
946	return sprintf(buffer, "%u\n", size);
947	}
948
949	static struct module_attribute modinfo_datasize =
950	__ATTR(datasize, 0444, show_datasize, NULL);
951	#endif
952
953	static ssize_t show_initsize(struct module_attribute *mattr,
954	struct module_kobject *mk, char *buffer)
955	{
956	unsigned int size = 0;
957
958	for_class_mod_mem_type(type, init)
959	size += mk->mod->mem[type].size;
960	return sprintf(buf: buffer, fmt: "%u\n", size);
961	}
962
963	static struct module_attribute modinfo_initsize =
964	__ATTR(initsize, 0444, show_initsize, NULL);
965
966	static ssize_t show_taint(struct module_attribute *mattr,
967	struct module_kobject *mk, char *buffer)
968	{
969	size_t l;
970
971	l = module_flags_taint(taints: mk->mod->taints, buf: buffer);
972	buffer[l++] = '\n';
973	return l;
974	}
975
976	static struct module_attribute modinfo_taint =
977	__ATTR(taint, 0444, show_taint, NULL);
978
979	struct module_attribute *modinfo_attrs[] = {
980	&module_uevent,
981	&modinfo_version,
982	&modinfo_srcversion,
983	&modinfo_initstate,
984	&modinfo_coresize,
985	#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
986	&modinfo_datasize,
987	#endif
988	&modinfo_initsize,
989	&modinfo_taint,
990	#ifdef CONFIG_MODULE_UNLOAD
991	&modinfo_refcnt,
992	#endif
993	NULL,
994	};
995
996	size_t modinfo_attrs_count = ARRAY_SIZE(modinfo_attrs);
997
998	static const char vermagic[] = VERMAGIC_STRING;
999
1000	int try_to_force_load(struct module *mod, const char *reason)
1001	{
1002	#ifdef CONFIG_MODULE_FORCE_LOAD
1003	if (!test_taint(TAINT_FORCED_MODULE))
1004	pr_warn("%s: %s: kernel tainted.\n", mod->name, reason);
1005	add_taint_module(mod, TAINT_FORCED_MODULE, lockdep_ok: LOCKDEP_NOW_UNRELIABLE);
1006	return 0;
1007	#else
1008	return -ENOEXEC;
1009	#endif
1010	}
1011
1012	/* Parse tag=value strings from .modinfo section */
1013	char *module_next_tag_pair(char *string, unsigned long *secsize)
1014	{
1015	/* Skip non-zero chars */
1016	while (string[0]) {
1017	string++;
1018	if ((*secsize)-- <= 1)
1019	return NULL;
1020	}
1021
1022	/* Skip any zero padding. */
1023	while (!string[0]) {
1024	string++;
1025	if ((*secsize)-- <= 1)
1026	return NULL;
1027	}
1028	return string;
1029	}
1030
1031	static char *get_next_modinfo(const struct load_info *info, const char *tag,
1032	char *prev)
1033	{
1034	char *p;
1035	unsigned int taglen = strlen(tag);
1036	Elf_Shdr *infosec = &info->sechdrs[info->index.info];
1037	unsigned long size = infosec->sh_size;
1038
1039	/*
1040	* get_modinfo() calls made before rewrite_section_headers()
1041	* must use sh_offset, as sh_addr isn't set!
1042	*/
1043	char *modinfo = (char *)info->hdr + infosec->sh_offset;
1044
1045	if (prev) {
1046	size -= prev - modinfo;
1047	modinfo = module_next_tag_pair(string: prev, secsize: &size);
1048	}
1049
1050	for (p = modinfo; p; p = module_next_tag_pair(string: p, secsize: &size)) {
1051	if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
1052	return p + taglen + 1;
1053	}
1054	return NULL;
1055	}
1056
1057	static char *get_modinfo(const struct load_info *info, const char *tag)
1058	{
1059	return get_next_modinfo(info, tag, NULL);
1060	}
1061
1062	static int verify_namespace_is_imported(const struct load_info *info,
1063	const struct kernel_symbol *sym,
1064	struct module *mod)
1065	{
1066	const char *namespace;
1067	char *imported_namespace;
1068
1069	namespace = kernel_symbol_namespace(sym);
1070	if (namespace && namespace[0]) {
1071	for_each_modinfo_entry(imported_namespace, info, "import_ns") {
1072	if (strcmp(namespace, imported_namespace) == 0)
1073	return 0;
1074	}
1075	#ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
1076	pr_warn(
1077	#else
1078	pr_err(
1079	#endif
1080	"%s: module uses symbol (%s) from namespace %s, but does not import it.\n",
1081	mod->name, kernel_symbol_name(sym), namespace);
1082	#ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
1083	return -EINVAL;
1084	#endif
1085	}
1086	return 0;
1087	}
1088
1089	static bool inherit_taint(struct module *mod, struct module *owner, const char *name)
1090	{
1091	if (!owner || !test_bit(TAINT_PROPRIETARY_MODULE, &owner->taints))
1092	return true;
1093
1094	if (mod->using_gplonly_symbols) {
1095	pr_err("%s: module using GPL-only symbols uses symbols %s from proprietary module %s.\n",
1096	mod->name, name, owner->name);
1097	return false;
1098	}
1099
1100	if (!test_bit(TAINT_PROPRIETARY_MODULE, &mod->taints)) {
1101	pr_warn("%s: module uses symbols %s from proprietary module %s, inheriting taint.\n",
1102	mod->name, name, owner->name);
1103	set_bit(TAINT_PROPRIETARY_MODULE, addr: &mod->taints);
1104	}
1105	return true;
1106	}
1107
1108	/* Resolve a symbol for this module. I.e. if we find one, record usage. */
1109	static const struct kernel_symbol *resolve_symbol(struct module *mod,
1110	const struct load_info *info,
1111	const char *name,
1112	char ownername[])
1113	{
1114	struct find_symbol_arg fsa = {
1115	.name = name,
1116	.gplok = !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)),
1117	.warn = true,
1118	};
1119	int err;
1120
1121	/*
1122	* The module_mutex should not be a heavily contended lock;
1123	* if we get the occasional sleep here, we'll go an extra iteration
1124	* in the wait_event_interruptible(), which is harmless.
1125	*/
1126	sched_annotate_sleep();
1127	mutex_lock(&module_mutex);
1128	if (!find_symbol(fsa: &fsa))
1129	goto unlock;
1130
1131	if (fsa.license == GPL_ONLY)
1132	mod->using_gplonly_symbols = true;
1133
1134	if (!inherit_taint(mod, owner: fsa.owner, name)) {
1135	fsa.sym = NULL;
1136	goto getname;
1137	}
1138
1139	if (!check_version(info, symname: name, mod, crc: fsa.crc)) {
1140	fsa.sym = ERR_PTR(error: -EINVAL);
1141	goto getname;
1142	}
1143
1144	err = verify_namespace_is_imported(info, sym: fsa.sym, mod);
1145	if (err) {
1146	fsa.sym = ERR_PTR(error: err);
1147	goto getname;
1148	}
1149
1150	err = ref_module(a: mod, b: fsa.owner);
1151	if (err) {
1152	fsa.sym = ERR_PTR(error: err);
1153	goto getname;
1154	}
1155
1156	getname:
1157	/* We must make copy under the lock if we failed to get ref. */
1158	strncpy(p: ownername, module_name(fsa.owner), MODULE_NAME_LEN);
1159	unlock:
1160	mutex_unlock(lock: &module_mutex);
1161	return fsa.sym;
1162	}
1163
1164	static const struct kernel_symbol *
1165	resolve_symbol_wait(struct module *mod,
1166	const struct load_info *info,
1167	const char *name)
1168	{
1169	const struct kernel_symbol *ksym;
1170	char owner[MODULE_NAME_LEN];
1171
1172	if (wait_event_interruptible_timeout(module_wq,
1173	!IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1174	|| PTR_ERR(ksym) != -EBUSY,
1175	30 * HZ) <= 0) {
1176	pr_warn("%s: gave up waiting for init of module %s.\n",
1177	mod->name, owner);
1178	}
1179	return ksym;
1180	}
1181
1182	void __weak module_memfree(void *module_region)
1183	{
1184	/*
1185	* This memory may be RO, and freeing RO memory in an interrupt is not
1186	* supported by vmalloc.
1187	*/
1188	WARN_ON(in_interrupt());
1189	vfree(addr: module_region);
1190	}
1191
1192	void __weak module_arch_cleanup(struct module *mod)
1193	{
1194	}
1195
1196	void __weak module_arch_freeing_init(struct module *mod)
1197	{
1198	}
1199
1200	static bool mod_mem_use_vmalloc(enum mod_mem_type type)
1201	{
1202	return IS_ENABLED(CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC) &&
1203	mod_mem_type_is_core_data(type);
1204	}
1205
1206	static void *module_memory_alloc(unsigned int size, enum mod_mem_type type)
1207	{
1208	if (mod_mem_use_vmalloc(type))
1209	return vzalloc(size);
1210	return module_alloc(size);
1211	}
1212
1213	static void module_memory_free(void *ptr, enum mod_mem_type type)
1214	{
1215	if (mod_mem_use_vmalloc(type))
1216	vfree(addr: ptr);
1217	else
1218	module_memfree(module_region: ptr);
1219	}
1220
1221	static void free_mod_mem(struct module *mod)
1222	{
1223	for_each_mod_mem_type(type) {
1224	struct module_memory *mod_mem = &mod->mem[type];
1225
1226	if (type == MOD_DATA)
1227	continue;
1228
1229	/* Free lock-classes; relies on the preceding sync_rcu(). */
1230	lockdep_free_key_range(start: mod_mem->base, size: mod_mem->size);
1231	if (mod_mem->size)
1232	module_memory_free(ptr: mod_mem->base, type);
1233	}
1234
1235	/* MOD_DATA hosts mod, so free it at last */
1236	lockdep_free_key_range(start: mod->mem[MOD_DATA].base, size: mod->mem[MOD_DATA].size);
1237	module_memory_free(ptr: mod->mem[MOD_DATA].base, type: MOD_DATA);
1238	}
1239
1240	/* Free a module, remove from lists, etc. */
1241	static void free_module(struct module *mod)
1242	{
1243	trace_module_free(mod);
1244
1245	mod_sysfs_teardown(mod);
1246
1247	/*
1248	* We leave it in list to prevent duplicate loads, but make sure
1249	* that noone uses it while it's being deconstructed.
1250	*/
1251	mutex_lock(&module_mutex);
1252	mod->state = MODULE_STATE_UNFORMED;
1253	mutex_unlock(lock: &module_mutex);
1254
1255	/* Arch-specific cleanup. */
1256	module_arch_cleanup(mod);
1257
1258	/* Module unload stuff */
1259	module_unload_free(mod);
1260
1261	/* Free any allocated parameters. */
1262	destroy_params(params: mod->kp, num: mod->num_kp);
1263
1264	if (is_livepatch_module(mod))
1265	free_module_elf(mod);
1266
1267	/* Now we can delete it from the lists */
1268	mutex_lock(&module_mutex);
1269	/* Unlink carefully: kallsyms could be walking list. */
1270	list_del_rcu(entry: &mod->list);
1271	mod_tree_remove(mod);
1272	/* Remove this module from bug list, this uses list_del_rcu */
1273	module_bug_cleanup(mod);
1274	/* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */
1275	synchronize_rcu();
1276	if (try_add_tainted_module(mod))
1277	pr_err("%s: adding tainted module to the unloaded tainted modules list failed.\n",
1278	mod->name);
1279	mutex_unlock(lock: &module_mutex);
1280
1281	/* This may be empty, but that's OK */
1282	module_arch_freeing_init(mod);
1283	kfree(objp: mod->args);
1284	percpu_modfree(mod);
1285
1286	free_mod_mem(mod);
1287	}
1288
1289	void *__symbol_get(const char *symbol)
1290	{
1291	struct find_symbol_arg fsa = {
1292	.name = symbol,
1293	.gplok = true,
1294	.warn = true,
1295	};
1296
1297	preempt_disable();
1298	if (!find_symbol(fsa: &fsa))
1299	goto fail;
1300	if (fsa.license != GPL_ONLY) {
1301	pr_warn("failing symbol_get of non-GPLONLY symbol %s.\n",
1302	symbol);
1303	goto fail;
1304	}
1305	if (strong_try_module_get(mod: fsa.owner))
1306	goto fail;
1307	preempt_enable();
1308	return (void *)kernel_symbol_value(sym: fsa.sym);
1309	fail:
1310	preempt_enable();
1311	return NULL;
1312	}
1313	EXPORT_SYMBOL_GPL(__symbol_get);
1314
1315	/*
1316	* Ensure that an exported symbol [global namespace] does not already exist
1317	* in the kernel or in some other module's exported symbol table.
1318	*
1319	* You must hold the module_mutex.
1320	*/
1321	static int verify_exported_symbols(struct module *mod)
1322	{
1323	unsigned int i;
1324	const struct kernel_symbol *s;
1325	struct {
1326	const struct kernel_symbol *sym;
1327	unsigned int num;
1328	} arr[] = {
1329	{ mod->syms, mod->num_syms },
1330	{ mod->gpl_syms, mod->num_gpl_syms },
1331	};
1332
1333	for (i = 0; i < ARRAY_SIZE(arr); i++) {
1334	for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
1335	struct find_symbol_arg fsa = {
1336	.name = kernel_symbol_name(sym: s),
1337	.gplok = true,
1338	};
1339	if (find_symbol(fsa: &fsa)) {
1340	pr_err("%s: exports duplicate symbol %s"
1341	" (owned by %s)\n",
1342	mod->name, kernel_symbol_name(s),
1343	module_name(fsa.owner));
1344	return -ENOEXEC;
1345	}
1346	}
1347	}
1348	return 0;
1349	}
1350
1351	static bool ignore_undef_symbol(Elf_Half emachine, const char *name)
1352	{
1353	/*
1354	* On x86, PIC code and Clang non-PIC code may have call foo@PLT. GNU as
1355	* before 2.37 produces an unreferenced _GLOBAL_OFFSET_TABLE_ on x86-64.
1356	* i386 has a similar problem but may not deserve a fix.
1357	*
1358	* If we ever have to ignore many symbols, consider refactoring the code to
1359	* only warn if referenced by a relocation.
1360	*/
1361	if (emachine == EM_386 || emachine == EM_X86_64)
1362	return !strcmp(name, "_GLOBAL_OFFSET_TABLE_");
1363	return false;
1364	}
1365
1366	/* Change all symbols so that st_value encodes the pointer directly. */
1367	static int simplify_symbols(struct module *mod, const struct load_info *info)
1368	{
1369	Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1370	Elf_Sym *sym = (void *)symsec->sh_addr;
1371	unsigned long secbase;
1372	unsigned int i;
1373	int ret = 0;
1374	const struct kernel_symbol *ksym;
1375
1376	for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1377	const char *name = info->strtab + sym[i].st_name;
1378
1379	switch (sym[i].st_shndx) {
1380	case SHN_COMMON:
1381	/* Ignore common symbols */
1382	if (!strncmp(name, "__gnu_lto", 9))
1383	break;
1384
1385	/*
1386	* We compiled with -fno-common. These are not
1387	* supposed to happen.
1388	*/
1389	pr_debug("Common symbol: %s\n", name);
1390	pr_warn("%s: please compile with -fno-common\n",
1391	mod->name);
1392	ret = -ENOEXEC;
1393	break;
1394
1395	case SHN_ABS:
1396	/* Don't need to do anything */
1397	pr_debug("Absolute symbol: 0x%08lx %s\n",
1398	(long)sym[i].st_value, name);
1399	break;
1400
1401	case SHN_LIVEPATCH:
1402	/* Livepatch symbols are resolved by livepatch */
1403	break;
1404
1405	case SHN_UNDEF:
1406	ksym = resolve_symbol_wait(mod, info, name);
1407	/* Ok if resolved. */
1408	if (ksym && !IS_ERR(ptr: ksym)) {
1409	sym[i].st_value = kernel_symbol_value(sym: ksym);
1410	break;
1411	}
1412
1413	/* Ok if weak or ignored. */
1414	if (!ksym &&
1415	(ELF_ST_BIND(sym[i].st_info) == STB_WEAK ||
1416	ignore_undef_symbol(emachine: info->hdr->e_machine, name)))
1417	break;
1418
1419	ret = PTR_ERR(ptr: ksym) ?: -ENOENT;
1420	pr_warn("%s: Unknown symbol %s (err %d)\n",
1421	mod->name, name, ret);
1422	break;
1423
1424	default:
1425	/* Divert to percpu allocation if a percpu var. */
1426	if (sym[i].st_shndx == info->index.pcpu)
1427	secbase = (unsigned long)mod_percpu(mod);
1428	else
1429	secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
1430	sym[i].st_value += secbase;
1431	break;
1432	}
1433	}
1434
1435	return ret;
1436	}
1437
1438	static int apply_relocations(struct module *mod, const struct load_info *info)
1439	{
1440	unsigned int i;
1441	int err = 0;
1442
1443	/* Now do relocations. */
1444	for (i = 1; i < info->hdr->e_shnum; i++) {
1445	unsigned int infosec = info->sechdrs[i].sh_info;
1446
1447	/* Not a valid relocation section? */
1448	if (infosec >= info->hdr->e_shnum)
1449	continue;
1450
1451	/* Don't bother with non-allocated sections */
1452	if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
1453	continue;
1454
1455	if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH)
1456	err = klp_apply_section_relocs(pmod: mod, sechdrs: info->sechdrs,
1457	shstrtab: info->secstrings,
1458	strtab: info->strtab,
1459	symindex: info->index.sym, secindex: i,
1460	NULL);
1461	else if (info->sechdrs[i].sh_type == SHT_REL)
1462	err = apply_relocate(sechdrs: info->sechdrs, strtab: info->strtab,
1463	symindex: info->index.sym, relsec: i, me: mod);
1464	else if (info->sechdrs[i].sh_type == SHT_RELA)
1465	err = apply_relocate_add(sechdrs: info->sechdrs, strtab: info->strtab,
1466	symindex: info->index.sym, relsec: i, mod);
1467	if (err < 0)
1468	break;
1469	}
1470	return err;
1471	}
1472
1473	/* Additional bytes needed by arch in front of individual sections */
1474	unsigned int __weak arch_mod_section_prepend(struct module *mod,
1475	unsigned int section)
1476	{
1477	/* default implementation just returns zero */
1478	return 0;
1479	}
1480
1481	long module_get_offset_and_type(struct module *mod, enum mod_mem_type type,
1482	Elf_Shdr *sechdr, unsigned int section)
1483	{
1484	long offset;
1485	long mask = ((unsigned long)(type) & SH_ENTSIZE_TYPE_MASK) << SH_ENTSIZE_TYPE_SHIFT;
1486
1487	mod->mem[type].size += arch_mod_section_prepend(mod, section);
1488	offset = ALIGN(mod->mem[type].size, sechdr->sh_addralign ?: 1);
1489	mod->mem[type].size = offset + sechdr->sh_size;
1490
1491	WARN_ON_ONCE(offset & mask);
1492	return offset | mask;
1493	}
1494
1495	bool module_init_layout_section(const char *sname)
1496	{
1497	#ifndef CONFIG_MODULE_UNLOAD
1498	if (module_exit_section(sname))
1499	return true;
1500	#endif
1501	return module_init_section(name: sname);
1502	}
1503
1504	static void __layout_sections(struct module *mod, struct load_info *info, bool is_init)
1505	{
1506	unsigned int m, i;
1507
1508	static const unsigned long masks[][2] = {
1509	/*
1510	* NOTE: all executable code must be the first section
1511	* in this array; otherwise modify the text_size
1512	* finder in the two loops below
1513	*/
1514	{ SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
1515	{ SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
1516	{ SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL },
1517	{ SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
1518	{ ARCH_SHF_SMALL | SHF_ALLOC, 0 }
1519	};
1520	static const int core_m_to_mem_type[] = {
1521	MOD_TEXT,
1522	MOD_RODATA,
1523	MOD_RO_AFTER_INIT,
1524	MOD_DATA,
1525	MOD_DATA,
1526	};
1527	static const int init_m_to_mem_type[] = {
1528	MOD_INIT_TEXT,
1529	MOD_INIT_RODATA,
1530	MOD_INVALID,
1531	MOD_INIT_DATA,
1532	MOD_INIT_DATA,
1533	};
1534
1535	for (m = 0; m < ARRAY_SIZE(masks); ++m) {
1536	enum mod_mem_type type = is_init ? init_m_to_mem_type[m] : core_m_to_mem_type[m];
1537
1538	for (i = 0; i < info->hdr->e_shnum; ++i) {
1539	Elf_Shdr *s = &info->sechdrs[i];
1540	const char *sname = info->secstrings + s->sh_name;
1541
1542	if ((s->sh_flags & masks[m][0]) != masks[m][0]
1543	|| (s->sh_flags & masks[m][1])
1544	|| s->sh_entsize != ~0UL
1545	|| is_init != module_init_layout_section(sname))
1546	continue;
1547
1548	if (WARN_ON_ONCE(type == MOD_INVALID))
1549	continue;
1550
1551	s->sh_entsize = module_get_offset_and_type(mod, type, sechdr: s, section: i);
1552	pr_debug("\t%s\n", sname);
1553	}
1554	}
1555	}
1556
1557	/*
1558	* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
1559	* might -- code, read-only data, read-write data, small data. Tally
1560	* sizes, and place the offsets into sh_entsize fields: high bit means it
1561	* belongs in init.
1562	*/
1563	static void layout_sections(struct module *mod, struct load_info *info)
1564	{
1565	unsigned int i;
1566
1567	for (i = 0; i < info->hdr->e_shnum; i++)
1568	info->sechdrs[i].sh_entsize = ~0UL;
1569
1570	pr_debug("Core section allocation order for %s:\n", mod->name);
1571	__layout_sections(mod, info, is_init: false);
1572
1573	pr_debug("Init section allocation order for %s:\n", mod->name);
1574	__layout_sections(mod, info, is_init: true);
1575	}
1576
1577	static void module_license_taint_check(struct module *mod, const char *license)
1578	{
1579	if (!license)
1580	license = "unspecified";
1581
1582	if (!license_is_gpl_compatible(license)) {
1583	if (!test_taint(TAINT_PROPRIETARY_MODULE))
1584	pr_warn("%s: module license '%s' taints kernel.\n",
1585	mod->name, license);
1586	add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
1587	lockdep_ok: LOCKDEP_NOW_UNRELIABLE);
1588	}
1589	}
1590
1591	static void setup_modinfo(struct module *mod, struct load_info *info)
1592	{
1593	struct module_attribute *attr;
1594	int i;
1595
1596	for (i = 0; (attr = modinfo_attrs[i]); i++) {
1597	if (attr->setup)
1598	attr->setup(mod, get_modinfo(info, tag: attr->attr.name));
1599	}
1600	}
1601
1602	static void free_modinfo(struct module *mod)
1603	{
1604	struct module_attribute *attr;
1605	int i;
1606
1607	for (i = 0; (attr = modinfo_attrs[i]); i++) {
1608	if (attr->free)
1609	attr->free(mod);
1610	}
1611	}
1612
1613	void * __weak module_alloc(unsigned long size)
1614	{
1615	return __vmalloc_node_range(size, align: 1, VMALLOC_START, VMALLOC_END,
1616	GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
1617	NUMA_NO_NODE, caller: __builtin_return_address(0));
1618	}
1619
1620	bool __weak module_init_section(const char *name)
1621	{
1622	return strstarts(str: name, prefix: ".init");
1623	}
1624
1625	bool __weak module_exit_section(const char *name)
1626	{
1627	return strstarts(str: name, prefix: ".exit");
1628	}
1629
1630	static int validate_section_offset(struct load_info *info, Elf_Shdr *shdr)
1631	{
1632	#if defined(CONFIG_64BIT)
1633	unsigned long long secend;
1634	#else
1635	unsigned long secend;
1636	#endif
1637
1638	/*
1639	* Check for both overflow and offset/size being
1640	* too large.
1641	*/
1642	secend = shdr->sh_offset + shdr->sh_size;
1643	if (secend < shdr->sh_offset || secend > info->len)
1644	return -ENOEXEC;
1645
1646	return 0;
1647	}
1648
1649	/*
1650	* Check userspace passed ELF module against our expectations, and cache
1651	* useful variables for further processing as we go.
1652	*
1653	* This does basic validity checks against section offsets and sizes, the
1654	* section name string table, and the indices used for it (sh_name).
1655	*
1656	* As a last step, since we're already checking the ELF sections we cache
1657	* useful variables which will be used later for our convenience:
1658	*
1659	* o pointers to section headers
1660	* o cache the modinfo symbol section
1661	* o cache the string symbol section
1662	* o cache the module section
1663	*
1664	* As a last step we set info->mod to the temporary copy of the module in
1665	* info->hdr. The final one will be allocated in move_module(). Any
1666	* modifications we make to our copy of the module will be carried over
1667	* to the final minted module.
1668	*/
1669	static int elf_validity_cache_copy(struct load_info *info, int flags)
1670	{
1671	unsigned int i;
1672	Elf_Shdr *shdr, *strhdr;
1673	int err;
1674	unsigned int num_mod_secs = 0, mod_idx;
1675	unsigned int num_info_secs = 0, info_idx;
1676	unsigned int num_sym_secs = 0, sym_idx;
1677
1678	if (info->len < sizeof(*(info->hdr))) {
1679	pr_err("Invalid ELF header len %lu\n", info->len);
1680	goto no_exec;
1681	}
1682
1683	if (memcmp(p: info->hdr->e_ident, ELFMAG, SELFMAG) != 0) {
1684	pr_err("Invalid ELF header magic: != %s\n", ELFMAG);
1685	goto no_exec;
1686	}
1687	if (info->hdr->e_type != ET_REL) {
1688	pr_err("Invalid ELF header type: %u != %u\n",
1689	info->hdr->e_type, ET_REL);
1690	goto no_exec;
1691	}
1692	if (!elf_check_arch(info->hdr)) {
1693	pr_err("Invalid architecture in ELF header: %u\n",
1694	info->hdr->e_machine);
1695	goto no_exec;
1696	}
1697	if (!module_elf_check_arch(hdr: info->hdr)) {
1698	pr_err("Invalid module architecture in ELF header: %u\n",
1699	info->hdr->e_machine);
1700	goto no_exec;
1701	}
1702	if (info->hdr->e_shentsize != sizeof(Elf_Shdr)) {
1703	pr_err("Invalid ELF section header size\n");
1704	goto no_exec;
1705	}
1706
1707	/*
1708	* e_shnum is 16 bits, and sizeof(Elf_Shdr) is
1709	* known and small. So e_shnum * sizeof(Elf_Shdr)
1710	* will not overflow unsigned long on any platform.
1711	*/
1712	if (info->hdr->e_shoff >= info->len
1713	|| (info->hdr->e_shnum * sizeof(Elf_Shdr) >
1714	info->len - info->hdr->e_shoff)) {
1715	pr_err("Invalid ELF section header overflow\n");
1716	goto no_exec;
1717	}
1718
1719	info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
1720
1721	/*
1722	* Verify if the section name table index is valid.
1723	*/
1724	if (info->hdr->e_shstrndx == SHN_UNDEF
1725	|| info->hdr->e_shstrndx >= info->hdr->e_shnum) {
1726	pr_err("Invalid ELF section name index: %d || e_shstrndx (%d) >= e_shnum (%d)\n",
1727	info->hdr->e_shstrndx, info->hdr->e_shstrndx,
1728	info->hdr->e_shnum);
1729	goto no_exec;
1730	}
1731
1732	strhdr = &info->sechdrs[info->hdr->e_shstrndx];
1733	err = validate_section_offset(info, shdr: strhdr);
1734	if (err < 0) {
1735	pr_err("Invalid ELF section hdr(type %u)\n", strhdr->sh_type);
1736	return err;
1737	}
1738
1739	/*
1740	* The section name table must be NUL-terminated, as required
1741	* by the spec. This makes strcmp and pr_* calls that access
1742	* strings in the section safe.
1743	*/
1744	info->secstrings = (void *)info->hdr + strhdr->sh_offset;
1745	if (strhdr->sh_size == 0) {
1746	pr_err("empty section name table\n");
1747	goto no_exec;
1748	}
1749	if (info->secstrings[strhdr->sh_size - 1] != '\0') {
1750	pr_err("ELF Spec violation: section name table isn't null terminated\n");
1751	goto no_exec;
1752	}
1753
1754	/*
1755	* The code assumes that section 0 has a length of zero and
1756	* an addr of zero, so check for it.
1757	*/
1758	if (info->sechdrs[0].sh_type != SHT_NULL
1759	|| info->sechdrs[0].sh_size != 0
1760	|| info->sechdrs[0].sh_addr != 0) {
1761	pr_err("ELF Spec violation: section 0 type(%d)!=SH_NULL or non-zero len or addr\n",
1762	info->sechdrs[0].sh_type);
1763	goto no_exec;
1764	}
1765
1766	for (i = 1; i < info->hdr->e_shnum; i++) {
1767	shdr = &info->sechdrs[i];
1768	switch (shdr->sh_type) {
1769	case SHT_NULL:
1770	case SHT_NOBITS:
1771	continue;
1772	case SHT_SYMTAB:
1773	if (shdr->sh_link == SHN_UNDEF
1774	|| shdr->sh_link >= info->hdr->e_shnum) {
1775	pr_err("Invalid ELF sh_link!=SHN_UNDEF(%d) or (sh_link(%d) >= hdr->e_shnum(%d)\n",
1776	shdr->sh_link, shdr->sh_link,
1777	info->hdr->e_shnum);
1778	goto no_exec;
1779	}
1780	num_sym_secs++;
1781	sym_idx = i;
1782	fallthrough;
1783	default:
1784	err = validate_section_offset(info, shdr);
1785	if (err < 0) {
1786	pr_err("Invalid ELF section in module (section %u type %u)\n",
1787	i, shdr->sh_type);
1788	return err;
1789	}
1790	if (strcmp(info->secstrings + shdr->sh_name,
1791	".gnu.linkonce.this_module") == 0) {
1792	num_mod_secs++;
1793	mod_idx = i;
1794	} else if (strcmp(info->secstrings + shdr->sh_name,
1795	".modinfo") == 0) {
1796	num_info_secs++;
1797	info_idx = i;
1798	}
1799
1800	if (shdr->sh_flags & SHF_ALLOC) {
1801	if (shdr->sh_name >= strhdr->sh_size) {
1802	pr_err("Invalid ELF section name in module (section %u type %u)\n",
1803	i, shdr->sh_type);
1804	return -ENOEXEC;
1805	}
1806	}
1807	break;
1808	}
1809	}
1810
1811	if (num_info_secs > 1) {
1812	pr_err("Only one .modinfo section must exist.\n");
1813	goto no_exec;
1814	} else if (num_info_secs == 1) {
1815	/* Try to find a name early so we can log errors with a module name */
1816	info->index.info = info_idx;
1817	info->name = get_modinfo(info, tag: "name");
1818	}
1819
1820	if (num_sym_secs != 1) {
1821	pr_warn("%s: module has no symbols (stripped?)\n",
1822	info->name ?: "(missing .modinfo section or name field)");
1823	goto no_exec;
1824	}
1825
1826	/* Sets internal symbols and strings. */
1827	info->index.sym = sym_idx;
1828	shdr = &info->sechdrs[sym_idx];
1829	info->index.str = shdr->sh_link;
1830	info->strtab = (char *)info->hdr + info->sechdrs[info->index.str].sh_offset;
1831
1832	/*
1833	* The ".gnu.linkonce.this_module" ELF section is special. It is
1834	* what modpost uses to refer to __this_module and let's use rely
1835	* on THIS_MODULE to point to &__this_module properly. The kernel's
1836	* modpost declares it on each modules's *.mod.c file. If the struct
1837	* module of the kernel changes a full kernel rebuild is required.
1838	*
1839	* We have a few expectaions for this special section, the following
1840	* code validates all this for us:
1841	*
1842	* o Only one section must exist
1843	* o We expect the kernel to always have to allocate it: SHF_ALLOC
1844	* o The section size must match the kernel's run time's struct module
1845	* size
1846	*/
1847	if (num_mod_secs != 1) {
1848	pr_err("module %s: Only one .gnu.linkonce.this_module section must exist.\n",
1849	info->name ?: "(missing .modinfo section or name field)");
1850	goto no_exec;
1851	}
1852
1853	shdr = &info->sechdrs[mod_idx];
1854
1855	/*
1856	* This is already implied on the switch above, however let's be
1857	* pedantic about it.
1858	*/
1859	if (shdr->sh_type == SHT_NOBITS) {
1860	pr_err("module %s: .gnu.linkonce.this_module section must have a size set\n",
1861	info->name ?: "(missing .modinfo section or name field)");
1862	goto no_exec;
1863	}
1864
1865	if (!(shdr->sh_flags & SHF_ALLOC)) {
1866	pr_err("module %s: .gnu.linkonce.this_module must occupy memory during process execution\n",
1867	info->name ?: "(missing .modinfo section or name field)");
1868	goto no_exec;
1869	}
1870
1871	if (shdr->sh_size != sizeof(struct module)) {
1872	pr_err("module %s: .gnu.linkonce.this_module section size must match the kernel's built struct module size at run time\n",
1873	info->name ?: "(missing .modinfo section or name field)");
1874	goto no_exec;
1875	}
1876
1877	info->index.mod = mod_idx;
1878
1879	/* This is temporary: point mod into copy of data. */
1880	info->mod = (void *)info->hdr + shdr->sh_offset;
1881
1882	/*
1883	* If we didn't load the .modinfo 'name' field earlier, fall back to
1884	* on-disk struct mod 'name' field.
1885	*/
1886	if (!info->name)
1887	info->name = info->mod->name;
1888
1889	if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
1890	info->index.vers = 0; /* Pretend no __versions section! */
1891	else
1892	info->index.vers = find_sec(info, name: "__versions");
1893
1894	info->index.pcpu = find_pcpusec(info);
1895
1896	return 0;
1897
1898	no_exec:
1899	return -ENOEXEC;
1900	}
1901
1902	#define COPY_CHUNK_SIZE (16*PAGE_SIZE)
1903
1904	static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len)
1905	{
1906	do {
1907	unsigned long n = min(len, COPY_CHUNK_SIZE);
1908
1909	if (copy_from_user(to: dst, from: usrc, n) != 0)
1910	return -EFAULT;
1911	cond_resched();
1912	dst += n;
1913	usrc += n;
1914	len -= n;
1915	} while (len);
1916	return 0;
1917	}
1918
1919	static int check_modinfo_livepatch(struct module *mod, struct load_info *info)
1920	{
1921	if (!get_modinfo(info, tag: "livepatch"))
1922	/* Nothing more to do */
1923	return 0;
1924
1925	if (set_livepatch_module(mod))
1926	return 0;
1927
1928	pr_err("%s: module is marked as livepatch module, but livepatch support is disabled",
1929	mod->name);
1930	return -ENOEXEC;
1931	}
1932
1933	static void check_modinfo_retpoline(struct module *mod, struct load_info *info)
1934	{
1935	if (retpoline_module_ok(has_retpoline: get_modinfo(info, tag: "retpoline")))
1936	return;
1937
1938	pr_warn("%s: loading module not compiled with retpoline compiler.\n",
1939	mod->name);
1940	}
1941
1942	/* Sets info->hdr and info->len. */
1943	static int copy_module_from_user(const void __user *umod, unsigned long len,
1944	struct load_info *info)
1945	{
1946	int err;
1947
1948	info->len = len;
1949	if (info->len < sizeof(*(info->hdr)))
1950	return -ENOEXEC;
1951
1952	err = security_kernel_load_data(id: LOADING_MODULE, contents: true);
1953	if (err)
1954	return err;
1955
1956	/* Suck in entire file: we'll want most of it. */
1957	info->hdr = __vmalloc(size: info->len, GFP_KERNEL | __GFP_NOWARN);
1958	if (!info->hdr)
1959	return -ENOMEM;
1960
1961	if (copy_chunked_from_user(dst: info->hdr, usrc: umod, len: info->len) != 0) {
1962	err = -EFAULT;
1963	goto out;
1964	}
1965
1966	err = security_kernel_post_load_data(buf: (char *)info->hdr, size: info->len,
1967	id: LOADING_MODULE, description: "init_module");
1968	out:
1969	if (err)
1970	vfree(addr: info->hdr);
1971
1972	return err;
1973	}
1974
1975	static void free_copy(struct load_info *info, int flags)
1976	{
1977	if (flags & MODULE_INIT_COMPRESSED_FILE)
1978	module_decompress_cleanup(info);
1979	else
1980	vfree(addr: info->hdr);
1981	}
1982
1983	static int rewrite_section_headers(struct load_info *info, int flags)
1984	{
1985	unsigned int i;
1986
1987	/* This should always be true, but let's be sure. */
1988	info->sechdrs[0].sh_addr = 0;
1989
1990	for (i = 1; i < info->hdr->e_shnum; i++) {
1991	Elf_Shdr *shdr = &info->sechdrs[i];
1992
1993	/*
1994	* Mark all sections sh_addr with their address in the
1995	* temporary image.
1996	*/
1997	shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
1998
1999	}
2000
2001	/* Track but don't keep modinfo and version sections. */
2002	info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
2003	info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2004
2005	return 0;
2006	}
2007
2008	/*
2009	* These calls taint the kernel depending certain module circumstances */
2010	static void module_augment_kernel_taints(struct module *mod, struct load_info *info)
2011	{
2012	int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE);
2013
2014	if (!get_modinfo(info, tag: "intree")) {
2015	if (!test_taint(TAINT_OOT_MODULE))
2016	pr_warn("%s: loading out-of-tree module taints kernel.\n",
2017	mod->name);
2018	add_taint_module(mod, TAINT_OOT_MODULE, lockdep_ok: LOCKDEP_STILL_OK);
2019	}
2020
2021	check_modinfo_retpoline(mod, info);
2022
2023	if (get_modinfo(info, tag: "staging")) {
2024	add_taint_module(mod, TAINT_CRAP, lockdep_ok: LOCKDEP_STILL_OK);
2025	pr_warn("%s: module is from the staging directory, the quality "
2026	"is unknown, you have been warned.\n", mod->name);
2027	}
2028
2029	if (is_livepatch_module(mod)) {
2030	add_taint_module(mod, TAINT_LIVEPATCH, lockdep_ok: LOCKDEP_STILL_OK);
2031	pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n",
2032	mod->name);
2033	}
2034
2035	module_license_taint_check(mod, license: get_modinfo(info, tag: "license"));
2036
2037	if (get_modinfo(info, tag: "test")) {
2038	if (!test_taint(TAINT_TEST))
2039	pr_warn("%s: loading test module taints kernel.\n",
2040	mod->name);
2041	add_taint_module(mod, TAINT_TEST, lockdep_ok: LOCKDEP_STILL_OK);
2042	}
2043	#ifdef CONFIG_MODULE_SIG
2044	mod->sig_ok = info->sig_ok;
2045	if (!mod->sig_ok) {
2046	pr_notice_once("%s: module verification failed: signature "
2047	"and/or required key missing - tainting "
2048	"kernel\n", mod->name);
2049	add_taint_module(mod, TAINT_UNSIGNED_MODULE, lockdep_ok: LOCKDEP_STILL_OK);
2050	}
2051	#endif
2052
2053	/*
2054	* ndiswrapper is under GPL by itself, but loads proprietary modules.
2055	* Don't use add_taint_module(), as it would prevent ndiswrapper from
2056	* using GPL-only symbols it needs.
2057	*/
2058	if (strcmp(mod->name, "ndiswrapper") == 0)
2059	add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
2060
2061	/* driverloader was caught wrongly pretending to be under GPL */
2062	if (strcmp(mod->name, "driverloader") == 0)
2063	add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2064	lockdep_ok: LOCKDEP_NOW_UNRELIABLE);
2065
2066	/* lve claims to be GPL but upstream won't provide source */
2067	if (strcmp(mod->name, "lve") == 0)
2068	add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2069	lockdep_ok: LOCKDEP_NOW_UNRELIABLE);
2070
2071	if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE))
2072	pr_warn("%s: module license taints kernel.\n", mod->name);
2073
2074	}
2075
2076	static int check_modinfo(struct module *mod, struct load_info *info, int flags)
2077	{
2078	const char *modmagic = get_modinfo(info, tag: "vermagic");
2079	int err;
2080
2081	if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2082	modmagic = NULL;
2083
2084	/* This is allowed: modprobe --force will invalidate it. */
2085	if (!modmagic) {
2086	err = try_to_force_load(mod, reason: "bad vermagic");
2087	if (err)
2088	return err;
2089	} else if (!same_magic(amagic: modmagic, bmagic: vermagic, has_crcs: info->index.vers)) {
2090	pr_err("%s: version magic '%s' should be '%s'\n",
2091	info->name, modmagic, vermagic);
2092	return -ENOEXEC;
2093	}
2094
2095	err = check_modinfo_livepatch(mod, info);
2096	if (err)
2097	return err;
2098
2099	return 0;
2100	}
2101
2102	static int find_module_sections(struct module *mod, struct load_info *info)
2103	{
2104	mod->kp = section_objs(info, name: "__param",
2105	object_size: sizeof(*mod->kp), num: &mod->num_kp);
2106	mod->syms = section_objs(info, name: "__ksymtab",
2107	object_size: sizeof(*mod->syms), num: &mod->num_syms);
2108	mod->crcs = section_addr(info, name: "__kcrctab");
2109	mod->gpl_syms = section_objs(info, name: "__ksymtab_gpl",
2110	object_size: sizeof(*mod->gpl_syms),
2111	num: &mod->num_gpl_syms);
2112	mod->gpl_crcs = section_addr(info, name: "__kcrctab_gpl");
2113
2114	#ifdef CONFIG_CONSTRUCTORS
2115	mod->ctors = section_objs(info, name: ".ctors",
2116	object_size: sizeof(*mod->ctors), num: &mod->num_ctors);
2117	if (!mod->ctors)
2118	mod->ctors = section_objs(info, name: ".init_array",
2119	object_size: sizeof(*mod->ctors), num: &mod->num_ctors);
2120	else if (find_sec(info, name: ".init_array")) {
2121	/*
2122	* This shouldn't happen with same compiler and binutils
2123	* building all parts of the module.
2124	*/
2125	pr_warn("%s: has both .ctors and .init_array.\n",
2126	mod->name);
2127	return -EINVAL;
2128	}
2129	#endif
2130
2131	mod->noinstr_text_start = section_objs(info, name: ".noinstr.text", object_size: 1,
2132	num: &mod->noinstr_text_size);
2133
2134	#ifdef CONFIG_TRACEPOINTS
2135	mod->tracepoints_ptrs = section_objs(info, name: "__tracepoints_ptrs",
2136	object_size: sizeof(*mod->tracepoints_ptrs),
2137	num: &mod->num_tracepoints);
2138	#endif
2139	#ifdef CONFIG_TREE_SRCU
2140	mod->srcu_struct_ptrs = section_objs(info, name: "___srcu_struct_ptrs",
2141	object_size: sizeof(*mod->srcu_struct_ptrs),
2142	num: &mod->num_srcu_structs);
2143	#endif
2144	#ifdef CONFIG_BPF_EVENTS
2145	mod->bpf_raw_events = section_objs(info, name: "__bpf_raw_tp_map",
2146	object_size: sizeof(*mod->bpf_raw_events),
2147	num: &mod->num_bpf_raw_events);
2148	#endif
2149	#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
2150	mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size);
2151	#endif
2152	#ifdef CONFIG_JUMP_LABEL
2153	mod->jump_entries = section_objs(info, name: "__jump_table",
2154	object_size: sizeof(*mod->jump_entries),
2155	num: &mod->num_jump_entries);
2156	#endif
2157	#ifdef CONFIG_EVENT_TRACING
2158	mod->trace_events = section_objs(info, name: "_ftrace_events",
2159	object_size: sizeof(*mod->trace_events),
2160	num: &mod->num_trace_events);
2161	mod->trace_evals = section_objs(info, name: "_ftrace_eval_map",
2162	object_size: sizeof(*mod->trace_evals),
2163	num: &mod->num_trace_evals);
2164	#endif
2165	#ifdef CONFIG_TRACING
2166	mod->trace_bprintk_fmt_start = section_objs(info, name: "__trace_printk_fmt",
2167	object_size: sizeof(*mod->trace_bprintk_fmt_start),
2168	num: &mod->num_trace_bprintk_fmt);
2169	#endif
2170	#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2171	/* sechdrs[0].sh_size is always zero */
2172	mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION,
2173	object_size: sizeof(*mod->ftrace_callsites),
2174	num: &mod->num_ftrace_callsites);
2175	#endif
2176	#ifdef CONFIG_FUNCTION_ERROR_INJECTION
2177	mod->ei_funcs = section_objs(info, name: "_error_injection_whitelist",
2178	object_size: sizeof(*mod->ei_funcs),
2179	num: &mod->num_ei_funcs);
2180	#endif
2181	#ifdef CONFIG_KPROBES
2182	mod->kprobes_text_start = section_objs(info, name: ".kprobes.text", object_size: 1,
2183	num: &mod->kprobes_text_size);
2184	mod->kprobe_blacklist = section_objs(info, name: "_kprobe_blacklist",
2185	object_size: sizeof(unsigned long),
2186	num: &mod->num_kprobe_blacklist);
2187	#endif
2188	#ifdef CONFIG_PRINTK_INDEX
2189	mod->printk_index_start = section_objs(info, name: ".printk_index",
2190	object_size: sizeof(*mod->printk_index_start),
2191	num: &mod->printk_index_size);
2192	#endif
2193	#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
2194	mod->static_call_sites = section_objs(info, name: ".static_call_sites",
2195	object_size: sizeof(*mod->static_call_sites),
2196	num: &mod->num_static_call_sites);
2197	#endif
2198	#if IS_ENABLED(CONFIG_KUNIT)
2199	mod->kunit_suites = section_objs(info, name: ".kunit_test_suites",
2200	object_size: sizeof(*mod->kunit_suites),
2201	num: &mod->num_kunit_suites);
2202	mod->kunit_init_suites = section_objs(info, name: ".kunit_init_test_suites",
2203	object_size: sizeof(*mod->kunit_init_suites),
2204	num: &mod->num_kunit_init_suites);
2205	#endif
2206
2207	mod->extable = section_objs(info, name: "__ex_table",
2208	object_size: sizeof(*mod->extable), num: &mod->num_exentries);
2209
2210	if (section_addr(info, name: "__obsparm"))
2211	pr_warn("%s: Ignoring obsolete parameters\n", mod->name);
2212
2213	#ifdef CONFIG_DYNAMIC_DEBUG_CORE
2214	mod->dyndbg_info.descs = section_objs(info, name: "__dyndbg",
2215	object_size: sizeof(*mod->dyndbg_info.descs),
2216	num: &mod->dyndbg_info.num_descs);
2217	mod->dyndbg_info.classes = section_objs(info, name: "__dyndbg_classes",
2218	object_size: sizeof(*mod->dyndbg_info.classes),
2219	num: &mod->dyndbg_info.num_classes);
2220	#endif
2221
2222	return 0;
2223	}
2224
2225	static int move_module(struct module *mod, struct load_info *info)
2226	{
2227	int i;
2228	void *ptr;
2229	enum mod_mem_type t = 0;
2230	int ret = -ENOMEM;
2231
2232	for_each_mod_mem_type(type) {
2233	if (!mod->mem[type].size) {
2234	mod->mem[type].base = NULL;
2235	continue;
2236	}
2237	mod->mem[type].size = PAGE_ALIGN(mod->mem[type].size);
2238	ptr = module_memory_alloc(size: mod->mem[type].size, type);
2239	/*
2240	* The pointer to these blocks of memory are stored on the module
2241	* structure and we keep that around so long as the module is
2242	* around. We only free that memory when we unload the module.
2243	* Just mark them as not being a leak then. The .init* ELF
2244	* sections *do* get freed after boot so we *could* treat them
2245	* slightly differently with kmemleak_ignore() and only grey
2246	* them out as they work as typical memory allocations which
2247	* *do* eventually get freed, but let's just keep things simple
2248	* and avoid *any* false positives.
2249	*/
2250	kmemleak_not_leak(ptr);
2251	if (!ptr) {
2252	t = type;
2253	goto out_enomem;
2254	}
2255	memset(ptr, 0, mod->mem[type].size);
2256	mod->mem[type].base = ptr;
2257	}
2258
2259	/* Transfer each section which specifies SHF_ALLOC */
2260	pr_debug("Final section addresses for %s:\n", mod->name);
2261	for (i = 0; i < info->hdr->e_shnum; i++) {
2262	void *dest;
2263	Elf_Shdr *shdr = &info->sechdrs[i];
2264	enum mod_mem_type type = shdr->sh_entsize >> SH_ENTSIZE_TYPE_SHIFT;
2265
2266	if (!(shdr->sh_flags & SHF_ALLOC))
2267	continue;
2268
2269	dest = mod->mem[type].base + (shdr->sh_entsize & SH_ENTSIZE_OFFSET_MASK);
2270
2271	if (shdr->sh_type != SHT_NOBITS) {
2272	/*
2273	* Our ELF checker already validated this, but let's
2274	* be pedantic and make the goal clearer. We actually
2275	* end up copying over all modifications made to the
2276	* userspace copy of the entire struct module.
2277	*/
2278	if (i == info->index.mod &&
2279	(WARN_ON_ONCE(shdr->sh_size != sizeof(struct module)))) {
2280	ret = -ENOEXEC;
2281	goto out_enomem;
2282	}
2283	memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
2284	}
2285	/*
2286	* Update the userspace copy's ELF section address to point to
2287	* our newly allocated memory as a pure convenience so that
2288	* users of info can keep taking advantage and using the newly
2289	* minted official memory area.
2290	*/
2291	shdr->sh_addr = (unsigned long)dest;
2292	pr_debug("\t0x%lx 0x%.8lx %s\n", (long)shdr->sh_addr,
2293	(long)shdr->sh_size, info->secstrings + shdr->sh_name);
2294	}
2295
2296	return 0;
2297	out_enomem:
2298	for (t--; t >= 0; t--)
2299	module_memory_free(ptr: mod->mem[t].base, type: t);
2300	return ret;
2301	}
2302
2303	static int check_export_symbol_versions(struct module *mod)
2304	{
2305	#ifdef CONFIG_MODVERSIONS
2306	if ((mod->num_syms && !mod->crcs) ||
2307	(mod->num_gpl_syms && !mod->gpl_crcs)) {
2308	return try_to_force_load(mod,
2309	reason: "no versions for exported symbols");
2310	}
2311	#endif
2312	return 0;
2313	}
2314
2315	static void flush_module_icache(const struct module *mod)
2316	{
2317	/*
2318	* Flush the instruction cache, since we've played with text.
2319	* Do it before processing of module parameters, so the module
2320	* can provide parameter accessor functions of its own.
2321	*/
2322	for_each_mod_mem_type(type) {
2323	const struct module_memory *mod_mem = &mod->mem[type];
2324
2325	if (mod_mem->size) {
2326	flush_icache_range(start: (unsigned long)mod_mem->base,
2327	end: (unsigned long)mod_mem->base + mod_mem->size);
2328	}
2329	}
2330	}
2331
2332	bool __weak module_elf_check_arch(Elf_Ehdr *hdr)
2333	{
2334	return true;
2335	}
2336
2337	int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2338	Elf_Shdr *sechdrs,
2339	char *secstrings,
2340	struct module *mod)
2341	{
2342	return 0;
2343	}
2344
2345	/* module_blacklist is a comma-separated list of module names */
2346	static char *module_blacklist;
2347	static bool blacklisted(const char *module_name)
2348	{
2349	const char *p;
2350	size_t len;
2351
2352	if (!module_blacklist)
2353	return false;
2354
2355	for (p = module_blacklist; *p; p += len) {
2356	len = strcspn(p, ",");
2357	if (strlen(module_name) == len && !memcmp(p: module_name, q: p, size: len))
2358	return true;
2359	if (p[len] == ',')
2360	len++;
2361	}
2362	return false;
2363	}
2364	core_param(module_blacklist, module_blacklist, charp, 0400);
2365
2366	static struct module *layout_and_allocate(struct load_info *info, int flags)
2367	{
2368	struct module *mod;
2369	unsigned int ndx;
2370	int err;
2371
2372	/* Allow arches to frob section contents and sizes. */
2373	err = module_frob_arch_sections(hdr: info->hdr, sechdrs: info->sechdrs,
2374	secstrings: info->secstrings, mod: info->mod);
2375	if (err < 0)
2376	return ERR_PTR(error: err);
2377
2378	err = module_enforce_rwx_sections(hdr: info->hdr, sechdrs: info->sechdrs,
2379	secstrings: info->secstrings, mod: info->mod);
2380	if (err < 0)
2381	return ERR_PTR(error: err);
2382
2383	/* We will do a special allocation for per-cpu sections later. */
2384	info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
2385
2386	/*
2387	* Mark ro_after_init section with SHF_RO_AFTER_INIT so that
2388	* layout_sections() can put it in the right place.
2389	* Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set.
2390	*/
2391	ndx = find_sec(info, name: ".data..ro_after_init");
2392	if (ndx)
2393	info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
2394	/*
2395	* Mark the __jump_table section as ro_after_init as well: these data
2396	* structures are never modified, with the exception of entries that
2397	* refer to code in the __init section, which are annotated as such
2398	* at module load time.
2399	*/
2400	ndx = find_sec(info, name: "__jump_table");
2401	if (ndx)
2402	info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
2403
2404	/*
2405	* Determine total sizes, and put offsets in sh_entsize. For now
2406	* this is done generically; there doesn't appear to be any
2407	* special cases for the architectures.
2408	*/
2409	layout_sections(mod: info->mod, info);
2410	layout_symtab(mod: info->mod, info);
2411
2412	/* Allocate and move to the final place */
2413	err = move_module(mod: info->mod, info);
2414	if (err)
2415	return ERR_PTR(error: err);
2416
2417	/* Module has been copied to its final place now: return it. */
2418	mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2419	kmemleak_load_module(mod, info);
2420	return mod;
2421	}
2422
2423	/* mod is no longer valid after this! */
2424	static void module_deallocate(struct module *mod, struct load_info *info)
2425	{
2426	percpu_modfree(mod);
2427	module_arch_freeing_init(mod);
2428
2429	free_mod_mem(mod);
2430	}
2431
2432	int __weak module_finalize(const Elf_Ehdr *hdr,
2433	const Elf_Shdr *sechdrs,
2434	struct module *me)
2435	{
2436	return 0;
2437	}
2438
2439	static int post_relocation(struct module *mod, const struct load_info *info)
2440	{
2441	/* Sort exception table now relocations are done. */
2442	sort_extable(start: mod->extable, finish: mod->extable + mod->num_exentries);
2443
2444	/* Copy relocated percpu area over. */
2445	percpu_modcopy(mod, from: (void *)info->sechdrs[info->index.pcpu].sh_addr,
2446	size: info->sechdrs[info->index.pcpu].sh_size);
2447
2448	/* Setup kallsyms-specific fields. */
2449	add_kallsyms(mod, info);
2450
2451	/* Arch-specific module finalizing. */
2452	return module_finalize(hdr: info->hdr, sechdrs: info->sechdrs, me: mod);
2453	}
2454
2455	/* Call module constructors. */
2456	static void do_mod_ctors(struct module *mod)
2457	{
2458	#ifdef CONFIG_CONSTRUCTORS
2459	unsigned long i;
2460
2461	for (i = 0; i < mod->num_ctors; i++)
2462	mod->ctors[i]();
2463	#endif
2464	}
2465
2466	/* For freeing module_init on success, in case kallsyms traversing */
2467	struct mod_initfree {
2468	struct llist_node node;
2469	void *init_text;
2470	void *init_data;
2471	void *init_rodata;
2472	};
2473
2474	static void do_free_init(struct work_struct *w)
2475	{
2476	struct llist_node *pos, *n, *list;
2477	struct mod_initfree *initfree;
2478
2479	list = llist_del_all(head: &init_free_list);
2480
2481	synchronize_rcu();
2482
2483	llist_for_each_safe(pos, n, list) {
2484	initfree = container_of(pos, struct mod_initfree, node);
2485	module_memfree(module_region: initfree->init_text);
2486	module_memfree(module_region: initfree->init_data);
2487	module_memfree(module_region: initfree->init_rodata);
2488	kfree(objp: initfree);
2489	}
2490	}
2491
2492	void flush_module_init_free_work(void)
2493	{
2494	flush_work(work: &init_free_wq);
2495	}
2496
2497	#undef MODULE_PARAM_PREFIX
2498	#define MODULE_PARAM_PREFIX "module."
2499	/* Default value for module->async_probe_requested */
2500	static bool async_probe;
2501	module_param(async_probe, bool, 0644);
2502
2503	/*
2504	* This is where the real work happens.
2505	*
2506	* Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
2507	* helper command 'lx-symbols'.
2508	*/
2509	static noinline int do_init_module(struct module *mod)
2510	{
2511	int ret = 0;
2512	struct mod_initfree *freeinit;
2513	#if defined(CONFIG_MODULE_STATS)
2514	unsigned int text_size = 0, total_size = 0;
2515
2516	for_each_mod_mem_type(type) {
2517	const struct module_memory *mod_mem = &mod->mem[type];
2518	if (mod_mem->size) {
2519	total_size += mod_mem->size;
2520	if (type == MOD_TEXT || type == MOD_INIT_TEXT)
2521	text_size += mod_mem->size;
2522	}
2523	}
2524	#endif
2525
2526	freeinit = kmalloc(size: sizeof(*freeinit), GFP_KERNEL);
2527	if (!freeinit) {
2528	ret = -ENOMEM;
2529	goto fail;
2530	}
2531	freeinit->init_text = mod->mem[MOD_INIT_TEXT].base;
2532	freeinit->init_data = mod->mem[MOD_INIT_DATA].base;
2533	freeinit->init_rodata = mod->mem[MOD_INIT_RODATA].base;
2534
2535	do_mod_ctors(mod);
2536	/* Start the module */
2537	if (mod->init != NULL)
2538	ret = do_one_initcall(fn: mod->init);
2539	if (ret < 0) {
2540	goto fail_free_freeinit;
2541	}
2542	if (ret > 0) {
2543	pr_warn("%s: '%s'->init suspiciously returned %d, it should "
2544	"follow 0/-E convention\n"
2545	"%s: loading module anyway...\n",
2546	__func__, mod->name, ret, __func__);
2547	dump_stack();
2548	}
2549
2550	/* Now it's a first class citizen! */
2551	mod->state = MODULE_STATE_LIVE;
2552	blocking_notifier_call_chain(nh: &module_notify_list,
2553	val: MODULE_STATE_LIVE, v: mod);
2554
2555	/* Delay uevent until module has finished its init routine */
2556	kobject_uevent(kobj: &mod->mkobj.kobj, action: KOBJ_ADD);
2557
2558	/*
2559	* We need to finish all async code before the module init sequence
2560	* is done. This has potential to deadlock if synchronous module
2561	* loading is requested from async (which is not allowed!).
2562	*
2563	* See commit 0fdff3ec6d87 ("async, kmod: warn on synchronous
2564	* request_module() from async workers") for more details.
2565	*/
2566	if (!mod->async_probe_requested)
2567	async_synchronize_full();
2568
2569	ftrace_free_mem(mod, start: mod->mem[MOD_INIT_TEXT].base,
2570	end: mod->mem[MOD_INIT_TEXT].base + mod->mem[MOD_INIT_TEXT].size);
2571	mutex_lock(&module_mutex);
2572	/* Drop initial reference. */
2573	module_put(mod);
2574	trim_init_extable(m: mod);
2575	#ifdef CONFIG_KALLSYMS
2576	/* Switch to core kallsyms now init is done: kallsyms may be walking! */
2577	rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms);
2578	#endif
2579	ret = module_enable_rodata_ro(mod, after_init: true);
2580	if (ret)
2581	goto fail_mutex_unlock;
2582	mod_tree_remove_init(mod);
2583	module_arch_freeing_init(mod);
2584	for_class_mod_mem_type(type, init) {
2585	mod->mem[type].base = NULL;
2586	mod->mem[type].size = 0;
2587	}
2588
2589	#ifdef CONFIG_DEBUG_INFO_BTF_MODULES
2590	/* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */
2591	mod->btf_data = NULL;
2592	#endif
2593	/*
2594	* We want to free module_init, but be aware that kallsyms may be
2595	* walking this with preempt disabled. In all the failure paths, we
2596	* call synchronize_rcu(), but we don't want to slow down the success
2597	* path. module_memfree() cannot be called in an interrupt, so do the
2598	* work and call synchronize_rcu() in a work queue.
2599	*
2600	* Note that module_alloc() on most architectures creates W+X page
2601	* mappings which won't be cleaned up until do_free_init() runs. Any
2602	* code such as mark_rodata_ro() which depends on those mappings to
2603	* be cleaned up needs to sync with the queued work by invoking
2604	* flush_module_init_free_work().
2605	*/
2606	if (llist_add(new: &freeinit->node, head: &init_free_list))
2607	schedule_work(work: &init_free_wq);
2608
2609	mutex_unlock(lock: &module_mutex);
2610	wake_up_all(&module_wq);
2611
2612	mod_stat_add_long(text_size, &total_text_size);
2613	mod_stat_add_long(total_size, &total_mod_size);
2614
2615	mod_stat_inc(&modcount);
2616
2617	return 0;
2618
2619	fail_mutex_unlock:
2620	mutex_unlock(lock: &module_mutex);
2621	fail_free_freeinit:
2622	kfree(objp: freeinit);
2623	fail:
2624	/* Try to protect us from buggy refcounters. */
2625	mod->state = MODULE_STATE_GOING;
2626	synchronize_rcu();
2627	module_put(mod);
2628	blocking_notifier_call_chain(nh: &module_notify_list,
2629	val: MODULE_STATE_GOING, v: mod);
2630	klp_module_going(mod);
2631	ftrace_release_mod(mod);
2632	free_module(mod);
2633	wake_up_all(&module_wq);
2634
2635	return ret;
2636	}
2637
2638	static int may_init_module(void)
2639	{
2640	if (!capable(CAP_SYS_MODULE) || modules_disabled)
2641	return -EPERM;
2642
2643	return 0;
2644	}
2645
2646	/* Is this module of this name done loading? No locks held. */
2647	static bool finished_loading(const char *name)
2648	{
2649	struct module *mod;
2650	bool ret;
2651
2652	/*
2653	* The module_mutex should not be a heavily contended lock;
2654	* if we get the occasional sleep here, we'll go an extra iteration
2655	* in the wait_event_interruptible(), which is harmless.
2656	*/
2657	sched_annotate_sleep();
2658	mutex_lock(&module_mutex);
2659	mod = find_module_all(name, strlen(name), even_unformed: true);
2660	ret = !mod || mod->state == MODULE_STATE_LIVE
2661	|| mod->state == MODULE_STATE_GOING;
2662	mutex_unlock(lock: &module_mutex);
2663
2664	return ret;
2665	}
2666
2667	/* Must be called with module_mutex held */
2668	static int module_patient_check_exists(const char *name,
2669	enum fail_dup_mod_reason reason)
2670	{
2671	struct module *old;
2672	int err = 0;
2673
2674	old = find_module_all(name, strlen(name), even_unformed: true);
2675	if (old == NULL)
2676	return 0;
2677
2678	if (old->state == MODULE_STATE_COMING ||
2679	old->state == MODULE_STATE_UNFORMED) {
2680	/* Wait in case it fails to load. */
2681	mutex_unlock(lock: &module_mutex);
2682	err = wait_event_interruptible(module_wq,
2683	finished_loading(name));
2684	mutex_lock(&module_mutex);
2685	if (err)
2686	return err;
2687
2688	/* The module might have gone in the meantime. */
2689	old = find_module_all(name, strlen(name), even_unformed: true);
2690	}
2691
2692	if (try_add_failed_module(name, reason))
2693	pr_warn("Could not add fail-tracking for module: %s\n", name);
2694
2695	/*
2696	* We are here only when the same module was being loaded. Do
2697	* not try to load it again right now. It prevents long delays
2698	* caused by serialized module load failures. It might happen
2699	* when more devices of the same type trigger load of
2700	* a particular module.
2701	*/
2702	if (old && old->state == MODULE_STATE_LIVE)
2703	return -EEXIST;
2704	return -EBUSY;
2705	}
2706
2707	/*
2708	* We try to place it in the list now to make sure it's unique before
2709	* we dedicate too many resources. In particular, temporary percpu
2710	* memory exhaustion.
2711	*/
2712	static int add_unformed_module(struct module *mod)
2713	{
2714	int err;
2715
2716	mod->state = MODULE_STATE_UNFORMED;
2717
2718	mutex_lock(&module_mutex);
2719	err = module_patient_check_exists(name: mod->name, reason: FAIL_DUP_MOD_LOAD);
2720	if (err)
2721	goto out;
2722
2723	mod_update_bounds(mod);
2724	list_add_rcu(new: &mod->list, head: &modules);
2725	mod_tree_insert(mod);
2726	err = 0;
2727
2728	out:
2729	mutex_unlock(lock: &module_mutex);
2730	return err;
2731	}
2732
2733	static int complete_formation(struct module *mod, struct load_info *info)
2734	{
2735	int err;
2736
2737	mutex_lock(&module_mutex);
2738
2739	/* Find duplicate symbols (must be called under lock). */
2740	err = verify_exported_symbols(mod);
2741	if (err < 0)
2742	goto out;
2743
2744	/* These rely on module_mutex for list integrity. */
2745	module_bug_finalize(info->hdr, info->sechdrs, mod);
2746	module_cfi_finalize(hdr: info->hdr, sechdrs: info->sechdrs, mod);
2747
2748	err = module_enable_rodata_ro(mod, after_init: false);
2749	if (err)
2750	goto out_strict_rwx;
2751	err = module_enable_data_nx(mod);
2752	if (err)
2753	goto out_strict_rwx;
2754	err = module_enable_text_rox(mod);
2755	if (err)
2756	goto out_strict_rwx;
2757
2758	/*
2759	* Mark state as coming so strong_try_module_get() ignores us,
2760	* but kallsyms etc. can see us.
2761	*/
2762	mod->state = MODULE_STATE_COMING;
2763	mutex_unlock(lock: &module_mutex);
2764
2765	return 0;
2766
2767	out_strict_rwx:
2768	module_bug_cleanup(mod);
2769	out:
2770	mutex_unlock(lock: &module_mutex);
2771	return err;
2772	}
2773
2774	static int prepare_coming_module(struct module *mod)
2775	{
2776	int err;
2777
2778	ftrace_module_enable(mod);
2779	err = klp_module_coming(mod);
2780	if (err)
2781	return err;
2782
2783	err = blocking_notifier_call_chain_robust(nh: &module_notify_list,
2784	val_up: MODULE_STATE_COMING, val_down: MODULE_STATE_GOING, v: mod);
2785	err = notifier_to_errno(ret: err);
2786	if (err)
2787	klp_module_going(mod);
2788
2789	return err;
2790	}
2791
2792	static int unknown_module_param_cb(char *param, char *val, const char *modname,
2793	void *arg)
2794	{
2795	struct module *mod = arg;
2796	int ret;
2797
2798	if (strcmp(param, "async_probe") == 0) {
2799	if (kstrtobool(s: val, res: &mod->async_probe_requested))
2800	mod->async_probe_requested = true;
2801	return 0;
2802	}
2803
2804	/* Check for magic 'dyndbg' arg */
2805	ret = ddebug_dyndbg_module_param_cb(param, val, modname);
2806	if (ret != 0)
2807	pr_warn("%s: unknown parameter '%s' ignored\n", modname, param);
2808	return 0;
2809	}
2810
2811	/* Module within temporary copy, this doesn't do any allocation */
2812	static int early_mod_check(struct load_info *info, int flags)
2813	{
2814	int err;
2815
2816	/*
2817	* Now that we know we have the correct module name, check
2818	* if it's blacklisted.
2819	*/
2820	if (blacklisted(module_name: info->name)) {
2821	pr_err("Module %s is blacklisted\n", info->name);
2822	return -EPERM;
2823	}
2824
2825	err = rewrite_section_headers(info, flags);
2826	if (err)
2827	return err;
2828
2829	/* Check module struct version now, before we try to use module. */
2830	if (!check_modstruct_version(info, mod: info->mod))
2831	return -ENOEXEC;
2832
2833	err = check_modinfo(mod: info->mod, info, flags);
2834	if (err)
2835	return err;
2836
2837	mutex_lock(&module_mutex);
2838	err = module_patient_check_exists(name: info->mod->name, reason: FAIL_DUP_MOD_BECOMING);
2839	mutex_unlock(lock: &module_mutex);
2840
2841	return err;
2842	}
2843
2844	/*
2845	* Allocate and load the module: note that size of section 0 is always
2846	* zero, and we rely on this for optional sections.
2847	*/
2848	static int load_module(struct load_info *info, const char __user *uargs,
2849	int flags)
2850	{
2851	struct module *mod;
2852	bool module_allocated = false;
2853	long err = 0;
2854	char *after_dashes;
2855
2856	/*
2857	* Do the signature check (if any) first. All that
2858	* the signature check needs is info->len, it does
2859	* not need any of the section info. That can be
2860	* set up later. This will minimize the chances
2861	* of a corrupt module causing problems before
2862	* we even get to the signature check.
2863	*
2864	* The check will also adjust info->len by stripping
2865	* off the sig length at the end of the module, making
2866	* checks against info->len more correct.
2867	*/
2868	err = module_sig_check(info, flags);
2869	if (err)
2870	goto free_copy;
2871
2872	/*
2873	* Do basic sanity checks against the ELF header and
2874	* sections. Cache useful sections and set the
2875	* info->mod to the userspace passed struct module.
2876	*/
2877	err = elf_validity_cache_copy(info, flags);
2878	if (err)
2879	goto free_copy;
2880
2881	err = early_mod_check(info, flags);
2882	if (err)
2883	goto free_copy;
2884
2885	/* Figure out module layout, and allocate all the memory. */
2886	mod = layout_and_allocate(info, flags);
2887	if (IS_ERR(ptr: mod)) {
2888	err = PTR_ERR(ptr: mod);
2889	goto free_copy;
2890	}
2891
2892	module_allocated = true;
2893
2894	audit_log_kern_module(name: mod->name);
2895
2896	/* Reserve our place in the list. */
2897	err = add_unformed_module(mod);
2898	if (err)
2899	goto free_module;
2900
2901	/*
2902	* We are tainting your kernel if your module gets into
2903	* the modules linked list somehow.
2904	*/
2905	module_augment_kernel_taints(mod, info);
2906
2907	/* To avoid stressing percpu allocator, do this once we're unique. */
2908	err = percpu_modalloc(mod, info);
2909	if (err)
2910	goto unlink_mod;
2911
2912	/* Now module is in final location, initialize linked lists, etc. */
2913	err = module_unload_init(mod);
2914	if (err)
2915	goto unlink_mod;
2916
2917	init_param_lock(mod);
2918
2919	/*
2920	* Now we've got everything in the final locations, we can
2921	* find optional sections.
2922	*/
2923	err = find_module_sections(mod, info);
2924	if (err)
2925	goto free_unload;
2926
2927	err = check_export_symbol_versions(mod);
2928	if (err)
2929	goto free_unload;
2930
2931	/* Set up MODINFO_ATTR fields */
2932	setup_modinfo(mod, info);
2933
2934	/* Fix up syms, so that st_value is a pointer to location. */
2935	err = simplify_symbols(mod, info);
2936	if (err < 0)
2937	goto free_modinfo;
2938
2939	err = apply_relocations(mod, info);
2940	if (err < 0)
2941	goto free_modinfo;
2942
2943	err = post_relocation(mod, info);
2944	if (err < 0)
2945	goto free_modinfo;
2946
2947	flush_module_icache(mod);
2948
2949	/* Now copy in args */
2950	mod->args = strndup_user(uargs, ~0UL >> 1);
2951	if (IS_ERR(ptr: mod->args)) {
2952	err = PTR_ERR(ptr: mod->args);
2953	goto free_arch_cleanup;
2954	}
2955
2956	init_build_id(mod, info);
2957
2958	/* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
2959	ftrace_module_init(mod);
2960
2961	/* Finally it's fully formed, ready to start executing. */
2962	err = complete_formation(mod, info);
2963	if (err)
2964	goto ddebug_cleanup;
2965
2966	err = prepare_coming_module(mod);
2967	if (err)
2968	goto bug_cleanup;
2969
2970	mod->async_probe_requested = async_probe;
2971
2972	/* Module is ready to execute: parsing args may do that. */
2973	after_dashes = parse_args(name: mod->name, args: mod->args, params: mod->kp, num: mod->num_kp,
2974	level_min: -32768, level_max: 32767, arg: mod,
2975	unknown: unknown_module_param_cb);
2976	if (IS_ERR(ptr: after_dashes)) {
2977	err = PTR_ERR(ptr: after_dashes);
2978	goto coming_cleanup;
2979	} else if (after_dashes) {
2980	pr_warn("%s: parameters '%s' after `--' ignored\n",
2981	mod->name, after_dashes);
2982	}
2983
2984	/* Link in to sysfs. */
2985	err = mod_sysfs_setup(mod, info, kparam: mod->kp, num_params: mod->num_kp);
2986	if (err < 0)
2987	goto coming_cleanup;
2988
2989	if (is_livepatch_module(mod)) {
2990	err = copy_module_elf(mod, info);
2991	if (err < 0)
2992	goto sysfs_cleanup;
2993	}
2994
2995	/* Get rid of temporary copy. */
2996	free_copy(info, flags);
2997
2998	/* Done! */
2999	trace_module_load(mod);
3000
3001	return do_init_module(mod);
3002
3003	sysfs_cleanup:
3004	mod_sysfs_teardown(mod);
3005	coming_cleanup:
3006	mod->state = MODULE_STATE_GOING;
3007	destroy_params(params: mod->kp, num: mod->num_kp);
3008	blocking_notifier_call_chain(nh: &module_notify_list,
3009	val: MODULE_STATE_GOING, v: mod);
3010	klp_module_going(mod);
3011	bug_cleanup:
3012	mod->state = MODULE_STATE_GOING;
3013	/* module_bug_cleanup needs module_mutex protection */
3014	mutex_lock(&module_mutex);
3015	module_bug_cleanup(mod);
3016	mutex_unlock(lock: &module_mutex);
3017
3018	ddebug_cleanup:
3019	ftrace_release_mod(mod);
3020	synchronize_rcu();
3021	kfree(objp: mod->args);
3022	free_arch_cleanup:
3023	module_arch_cleanup(mod);
3024	free_modinfo:
3025	free_modinfo(mod);
3026	free_unload:
3027	module_unload_free(mod);
3028	unlink_mod:
3029	mutex_lock(&module_mutex);
3030	/* Unlink carefully: kallsyms could be walking list. */
3031	list_del_rcu(entry: &mod->list);
3032	mod_tree_remove(mod);
3033	wake_up_all(&module_wq);
3034	/* Wait for RCU-sched synchronizing before releasing mod->list. */
3035	synchronize_rcu();
3036	mutex_unlock(lock: &module_mutex);
3037	free_module:
3038	mod_stat_bump_invalid(info, flags);
3039	/* Free lock-classes; relies on the preceding sync_rcu() */
3040	for_class_mod_mem_type(type, core_data) {
3041	lockdep_free_key_range(start: mod->mem[type].base,
3042	size: mod->mem[type].size);
3043	}
3044
3045	module_deallocate(mod, info);
3046	free_copy:
3047	/*
3048	* The info->len is always set. We distinguish between
3049	* failures once the proper module was allocated and
3050	* before that.
3051	*/
3052	if (!module_allocated)
3053	mod_stat_bump_becoming(info, flags);
3054	free_copy(info, flags);
3055	return err;
3056	}
3057
3058	SYSCALL_DEFINE3(init_module, void __user *, umod,
3059	unsigned long, len, const char __user *, uargs)
3060	{
3061	int err;
3062	struct load_info info = { };
3063
3064	err = may_init_module();
3065	if (err)
3066	return err;
3067
3068	pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3069	umod, len, uargs);
3070
3071	err = copy_module_from_user(umod, len, info: &info);
3072	if (err) {
3073	mod_stat_inc(&failed_kreads);
3074	mod_stat_add_long(len, &invalid_kread_bytes);
3075	return err;
3076	}
3077
3078	return load_module(info: &info, uargs, flags: 0);
3079	}
3080
3081	struct idempotent {
3082	const void *cookie;
3083	struct hlist_node entry;
3084	struct completion complete;
3085	int ret;
3086	};
3087
3088	#define IDEM_HASH_BITS 8
3089	static struct hlist_head idem_hash[1 << IDEM_HASH_BITS];
3090	static DEFINE_SPINLOCK(idem_lock);
3091
3092	static bool idempotent(struct idempotent *u, const void *cookie)
3093	{
3094	int hash = hash_ptr(ptr: cookie, IDEM_HASH_BITS);
3095	struct hlist_head *head = idem_hash + hash;
3096	struct idempotent *existing;
3097	bool first;
3098
3099	u->ret = 0;
3100	u->cookie = cookie;
3101	init_completion(x: &u->complete);
3102
3103	spin_lock(lock: &idem_lock);
3104	first = true;
3105	hlist_for_each_entry(existing, head, entry) {
3106	if (existing->cookie != cookie)
3107	continue;
3108	first = false;
3109	break;
3110	}
3111	hlist_add_head(n: &u->entry, h: idem_hash + hash);
3112	spin_unlock(lock: &idem_lock);
3113
3114	return !first;
3115	}
3116
3117	/*
3118	* We were the first one with 'cookie' on the list, and we ended
3119	* up completing the operation. We now need to walk the list,
3120	* remove everybody - which includes ourselves - fill in the return
3121	* value, and then complete the operation.
3122	*/
3123	static int idempotent_complete(struct idempotent *u, int ret)
3124	{
3125	const void *cookie = u->cookie;
3126	int hash = hash_ptr(ptr: cookie, IDEM_HASH_BITS);
3127	struct hlist_head *head = idem_hash + hash;
3128	struct hlist_node *next;
3129	struct idempotent *pos;
3130
3131	spin_lock(lock: &idem_lock);
3132	hlist_for_each_entry_safe(pos, next, head, entry) {
3133	if (pos->cookie != cookie)
3134	continue;
3135	hlist_del(n: &pos->entry);
3136	pos->ret = ret;
3137	complete(&pos->complete);
3138	}
3139	spin_unlock(lock: &idem_lock);
3140	return ret;
3141	}
3142
3143	static int init_module_from_file(struct file *f, const char __user * uargs, int flags)
3144	{
3145	struct load_info info = { };
3146	void *buf = NULL;
3147	int len;
3148
3149	len = kernel_read_file(file: f, offset: 0, buf: &buf, INT_MAX, NULL, id: READING_MODULE);
3150	if (len < 0) {
3151	mod_stat_inc(&failed_kreads);
3152	return len;
3153	}
3154
3155	if (flags & MODULE_INIT_COMPRESSED_FILE) {
3156	int err = module_decompress(info: &info, buf, size: len);
3157	vfree(addr: buf); /* compressed data is no longer needed */
3158	if (err) {
3159	mod_stat_inc(&failed_decompress);
3160	mod_stat_add_long(len, &invalid_decompress_bytes);
3161	return err;
3162	}
3163	} else {
3164	info.hdr = buf;
3165	info.len = len;
3166	}
3167
3168	return load_module(info: &info, uargs, flags);
3169	}
3170
3171	static int idempotent_init_module(struct file *f, const char __user * uargs, int flags)
3172	{
3173	struct idempotent idem;
3174
3175	if (!f || !(f->f_mode & FMODE_READ))
3176	return -EBADF;
3177
3178	/* See if somebody else is doing the operation? */
3179	if (idempotent(u: &idem, cookie: file_inode(f))) {
3180	wait_for_completion(&idem.complete);
3181	return idem.ret;
3182	}
3183
3184	/* Otherwise, we'll do it and complete others */
3185	return idempotent_complete(u: &idem,
3186	ret: init_module_from_file(f, uargs, flags));
3187	}
3188
3189	SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
3190	{
3191	int err;
3192	struct fd f;
3193
3194	err = may_init_module();
3195	if (err)
3196	return err;
3197
3198	pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
3199
3200	if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
3201	|MODULE_INIT_IGNORE_VERMAGIC
3202	|MODULE_INIT_COMPRESSED_FILE))
3203	return -EINVAL;
3204
3205	f = fdget(fd);
3206	err = idempotent_init_module(f: f.file, uargs, flags);
3207	fdput(fd: f);
3208	return err;
3209	}
3210
3211	/* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */
3212	char *module_flags(struct module *mod, char *buf, bool show_state)
3213	{
3214	int bx = 0;
3215
3216	BUG_ON(mod->state == MODULE_STATE_UNFORMED);
3217	if (!mod->taints && !show_state)
3218	goto out;
3219	if (mod->taints ||
3220	mod->state == MODULE_STATE_GOING ||
3221	mod->state == MODULE_STATE_COMING) {
3222	buf[bx++] = '(';
3223	bx += module_flags_taint(taints: mod->taints, buf: buf + bx);
3224	/* Show a - for module-is-being-unloaded */
3225	if (mod->state == MODULE_STATE_GOING && show_state)
3226	buf[bx++] = '-';
3227	/* Show a + for module-is-being-loaded */
3228	if (mod->state == MODULE_STATE_COMING && show_state)
3229	buf[bx++] = '+';
3230	buf[bx++] = ')';
3231	}
3232	out:
3233	buf[bx] = '\0';
3234
3235	return buf;
3236	}
3237
3238	/* Given an address, look for it in the module exception tables. */
3239	const struct exception_table_entry *search_module_extables(unsigned long addr)
3240	{
3241	const struct exception_table_entry *e = NULL;
3242	struct module *mod;
3243
3244	preempt_disable();
3245	mod = __module_address(addr);
3246	if (!mod)
3247	goto out;
3248
3249	if (!mod->num_exentries)
3250	goto out;
3251
3252	e = search_extable(base: mod->extable,
3253	num: mod->num_exentries,
3254	value: addr);
3255	out:
3256	preempt_enable();
3257
3258	/*
3259	* Now, if we found one, we are running inside it now, hence
3260	* we cannot unload the module, hence no refcnt needed.
3261	*/
3262	return e;
3263	}
3264
3265	/**
3266	* is_module_address() - is this address inside a module?
3267	* @addr: the address to check.
3268	*
3269	* See is_module_text_address() if you simply want to see if the address
3270	* is code (not data).
3271	*/
3272	bool is_module_address(unsigned long addr)
3273	{
3274	bool ret;
3275
3276	preempt_disable();
3277	ret = __module_address(addr) != NULL;
3278	preempt_enable();
3279
3280	return ret;
3281	}
3282
3283	/**
3284	* __module_address() - get the module which contains an address.
3285	* @addr: the address.
3286	*
3287	* Must be called with preempt disabled or module mutex held so that
3288	* module doesn't get freed during this.
3289	*/
3290	struct module *__module_address(unsigned long addr)
3291	{
3292	struct module *mod;
3293
3294	if (addr >= mod_tree.addr_min && addr <= mod_tree.addr_max)
3295	goto lookup;
3296
3297	#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
3298	if (addr >= mod_tree.data_addr_min && addr <= mod_tree.data_addr_max)
3299	goto lookup;
3300	#endif
3301
3302	return NULL;
3303
3304	lookup:
3305	module_assert_mutex_or_preempt();
3306
3307	mod = mod_find(addr, tree: &mod_tree);
3308	if (mod) {
3309	BUG_ON(!within_module(addr, mod));
3310	if (mod->state == MODULE_STATE_UNFORMED)
3311	mod = NULL;
3312	}
3313	return mod;
3314	}
3315
3316	/**
3317	* is_module_text_address() - is this address inside module code?
3318	* @addr: the address to check.
3319	*
3320	* See is_module_address() if you simply want to see if the address is
3321	* anywhere in a module. See kernel_text_address() for testing if an
3322	* address corresponds to kernel or module code.
3323	*/
3324	bool is_module_text_address(unsigned long addr)
3325	{
3326	bool ret;
3327
3328	preempt_disable();
3329	ret = __module_text_address(addr) != NULL;
3330	preempt_enable();
3331
3332	return ret;
3333	}
3334
3335	/**
3336	* __module_text_address() - get the module whose code contains an address.
3337	* @addr: the address.
3338	*
3339	* Must be called with preempt disabled or module mutex held so that
3340	* module doesn't get freed during this.
3341	*/
3342	struct module *__module_text_address(unsigned long addr)
3343	{
3344	struct module *mod = __module_address(addr);
3345	if (mod) {
3346	/* Make sure it's within the text section. */
3347	if (!within_module_mem_type(addr, mod, type: MOD_TEXT) &&
3348	!within_module_mem_type(addr, mod, type: MOD_INIT_TEXT))
3349	mod = NULL;
3350	}
3351	return mod;
3352	}
3353
3354	/* Don't grab lock, we're oopsing. */
3355	void print_modules(void)
3356	{
3357	struct module *mod;
3358	char buf[MODULE_FLAGS_BUF_SIZE];
3359
3360	printk(KERN_DEFAULT "Modules linked in:");
3361	/* Most callers should already have preempt disabled, but make sure */
3362	preempt_disable();
3363	list_for_each_entry_rcu(mod, &modules, list) {
3364	if (mod->state == MODULE_STATE_UNFORMED)
3365	continue;
3366	pr_cont(" %s%s", mod->name, module_flags(mod, buf, true));
3367	}
3368
3369	print_unloaded_tainted_modules();
3370	preempt_enable();
3371	if (last_unloaded_module.name[0])
3372	pr_cont(" [last unloaded: %s%s]", last_unloaded_module.name,
3373	last_unloaded_module.taints);
3374	pr_cont("\n");
3375	}
3376
3377	#ifdef CONFIG_MODULE_DEBUGFS
3378	struct dentry *mod_debugfs_root;
3379
3380	static int module_debugfs_init(void)
3381	{
3382	mod_debugfs_root = debugfs_create_dir(name: "modules", NULL);
3383	return 0;
3384	}
3385	module_init(module_debugfs_init);
3386	#endif
3387