diff --git a/kernel/module.c b/kernel/module.c
index 6746c85..ff2d735 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1,24 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
    Copyright (C) 2002 Richard Henderson
    Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
 
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 #include <linux/export.h>
 #include <linux/extable.h>
 #include <linux/moduleloader.h>
+#include <linux/module_signature.h>
 #include <linux/trace_events.h>
 #include <linux/init.h>
 #include <linux/kallsyms.h>
@@ -77,9 +66,9 @@
 /*
  * Modules' sections will be aligned on page boundaries
  * to ensure complete separation of code and data, but
- * only when CONFIG_STRICT_MODULE_RWX=y
+ * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
  */
-#ifdef CONFIG_STRICT_MODULE_RWX
+#ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX
 # define debug_align(X) ALIGN(X, PAGE_SIZE)
 #else
 # define debug_align(X) (X)
@@ -98,6 +87,10 @@
 EXPORT_SYMBOL_GPL(module_mutex);
 static LIST_HEAD(modules);
 
+/* Work queue for freeing init sections in success case */
+static struct work_struct init_free_wq;
+static struct llist_head init_free_list;
+
 #ifdef CONFIG_MODULES_TREE_LOOKUP
 
 /*
@@ -286,6 +279,11 @@
 }
 EXPORT_SYMBOL(is_module_sig_enforced);
 
+void set_module_sig_enforced(void)
+{
+	sig_enforce = true;
+}
+
 /* Block module loading/unloading? */
 int modules_disabled = 0;
 core_param(nomodule, modules_disabled, bint, 0);
@@ -495,9 +493,9 @@
 	const struct kernel_symbol *sym;
 };
 
-static bool check_symbol(const struct symsearch *syms,
-				 struct module *owner,
-				 unsigned int symnum, void *data)
+static bool check_exported_symbol(const struct symsearch *syms,
+				  struct module *owner,
+				  unsigned int symnum, void *data)
 {
 	struct find_symbol_arg *fsa = data;
 
@@ -547,17 +545,25 @@
 #endif
 }
 
-static int cmp_name(const void *va, const void *vb)
+static const char *kernel_symbol_namespace(const struct kernel_symbol *sym)
 {
-	const char *a;
-	const struct kernel_symbol *b;
-	a = va; b = vb;
-	return strcmp(a, kernel_symbol_name(b));
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+	if (!sym->namespace_offset)
+		return NULL;
+	return offset_to_ptr(&sym->namespace_offset);
+#else
+	return sym->namespace;
+#endif
 }
 
-static bool find_symbol_in_section(const struct symsearch *syms,
-				   struct module *owner,
-				   void *data)
+static int cmp_name(const void *name, const void *sym)
+{
+	return strcmp(name, kernel_symbol_name(sym));
+}
+
+static bool find_exported_symbol_in_section(const struct symsearch *syms,
+					    struct module *owner,
+					    void *data)
 {
 	struct find_symbol_arg *fsa = data;
 	struct kernel_symbol *sym;
@@ -565,13 +571,14 @@
 	sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
 			sizeof(struct kernel_symbol), cmp_name);
 
-	if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
+	if (sym != NULL && check_exported_symbol(syms, owner,
+						 sym - syms->start, data))
 		return true;
 
 	return false;
 }
 
-/* Find a symbol and return it, along with, (optional) crc and
+/* Find an exported symbol and return it, along with, (optional) crc and
  * (optional) module which owns it.  Needs preempt disabled or module_mutex. */
 const struct kernel_symbol *find_symbol(const char *name,
 					struct module **owner,
@@ -585,7 +592,7 @@
 	fsa.gplok = gplok;
 	fsa.warn = warn;
 
-	if (each_symbol_section(find_symbol_in_section, &fsa)) {
+	if (each_symbol_section(find_exported_symbol_in_section, &fsa)) {
 		if (owner)
 			*owner = fsa.owner;
 		if (crc)
@@ -1207,8 +1214,10 @@
 			    struct module_kobject *mk,
 			    const char *buffer, size_t count)
 {
-	kobject_synth_uevent(&mk->kobj, buffer, count);
-	return count;
+	int rc;
+
+	rc = kobject_synth_uevent(&mk->kobj, buffer, count);
+	return rc ? rc : count;
 }
 
 struct module_attribute module_uevent =
@@ -1379,6 +1388,41 @@
 }
 #endif /* CONFIG_MODVERSIONS */
 
+static char *get_modinfo(const struct load_info *info, const char *tag);
+static char *get_next_modinfo(const struct load_info *info, const char *tag,
+			      char *prev);
+
+static int verify_namespace_is_imported(const struct load_info *info,
+					const struct kernel_symbol *sym,
+					struct module *mod)
+{
+	const char *namespace;
+	char *imported_namespace;
+
+	namespace = kernel_symbol_namespace(sym);
+	if (namespace) {
+		imported_namespace = get_modinfo(info, "import_ns");
+		while (imported_namespace) {
+			if (strcmp(namespace, imported_namespace) == 0)
+				return 0;
+			imported_namespace = get_next_modinfo(
+				info, "import_ns", imported_namespace);
+		}
+#ifdef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
+		pr_warn(
+#else
+		pr_err(
+#endif
+			"%s: module uses symbol (%s) from namespace %s, but does not import it.\n",
+			mod->name, kernel_symbol_name(sym), namespace);
+#ifndef CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS
+		return -EINVAL;
+#endif
+	}
+	return 0;
+}
+
+
 /* Resolve a symbol for this module.  I.e. if we find one, record usage. */
 static const struct kernel_symbol *resolve_symbol(struct module *mod,
 						  const struct load_info *info,
@@ -1407,6 +1451,12 @@
 		goto getname;
 	}
 
+	err = verify_namespace_is_imported(info, sym, mod);
+	if (err) {
+		sym = ERR_PTR(err);
+		goto getname;
+	}
+
 	err = ref_module(mod, owner);
 	if (err) {
 		sym = ERR_PTR(err);
@@ -1492,8 +1542,7 @@
 	for (i = 0; i < info->hdr->e_shnum; i++)
 		if (!sect_empty(&info->sechdrs[i]))
 			nloaded++;
-	size[0] = ALIGN(sizeof(*sect_attrs)
-			+ nloaded * sizeof(sect_attrs->attrs[0]),
+	size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded),
 			sizeof(sect_attrs->grp.attrs[0]));
 	size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
 	sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
@@ -1697,6 +1746,8 @@
 	return ret;
 }
 
+static void module_remove_modinfo_attrs(struct module *mod, int end);
+
 static int module_add_modinfo_attrs(struct module *mod)
 {
 	struct module_attribute *attr;
@@ -1711,24 +1762,34 @@
 		return -ENOMEM;
 
 	temp_attr = mod->modinfo_attrs;
-	for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
+	for (i = 0; (attr = modinfo_attrs[i]); i++) {
 		if (!attr->test || attr->test(mod)) {
 			memcpy(temp_attr, attr, sizeof(*temp_attr));
 			sysfs_attr_init(&temp_attr->attr);
 			error = sysfs_create_file(&mod->mkobj.kobj,
 					&temp_attr->attr);
+			if (error)
+				goto error_out;
 			++temp_attr;
 		}
 	}
+
+	return 0;
+
+error_out:
+	if (i > 0)
+		module_remove_modinfo_attrs(mod, --i);
 	return error;
 }
 
-static void module_remove_modinfo_attrs(struct module *mod)
+static void module_remove_modinfo_attrs(struct module *mod, int end)
 {
 	struct module_attribute *attr;
 	int i;
 
 	for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
+		if (end >= 0 && i > end)
+			break;
 		/* pick a field to test for end of list */
 		if (!attr->attr.name)
 			break;
@@ -1816,7 +1877,7 @@
 	return 0;
 
 out_unreg_modinfo_attrs:
-	module_remove_modinfo_attrs(mod);
+	module_remove_modinfo_attrs(mod, -1);
 out_unreg_param:
 	module_param_sysfs_remove(mod);
 out_unreg_holders:
@@ -1852,7 +1913,7 @@
 {
 }
 
-static void module_remove_modinfo_attrs(struct module *mod)
+static void module_remove_modinfo_attrs(struct module *mod, int end)
 {
 }
 
@@ -1868,14 +1929,14 @@
 static void mod_sysfs_teardown(struct module *mod)
 {
 	del_usage_links(mod);
-	module_remove_modinfo_attrs(mod);
+	module_remove_modinfo_attrs(mod, -1);
 	module_param_sysfs_remove(mod);
 	kobject_put(mod->mkobj.drivers_dir);
 	kobject_put(mod->holders_dir);
 	mod_sysfs_fini(mod);
 }
 
-#ifdef CONFIG_STRICT_MODULE_RWX
+#ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX
 /*
  * LKM RO/NX protection: protect module's text/ro-data
  * from modification and any data from execution.
@@ -1898,6 +1959,7 @@
 		   layout->text_size >> PAGE_SHIFT);
 }
 
+#ifdef CONFIG_STRICT_MODULE_RWX
 static void frob_rodata(const struct module_layout *layout,
 			int (*set_memory)(unsigned long start, int num_pages))
 {
@@ -1946,7 +2008,10 @@
 	if (!rodata_enabled)
 		return;
 
+	set_vm_flush_reset_perms(mod->core_layout.base);
+	set_vm_flush_reset_perms(mod->init_layout.base);
 	frob_text(&mod->core_layout, set_memory_ro);
+
 	frob_rodata(&mod->core_layout, set_memory_ro);
 	frob_text(&mod->init_layout, set_memory_ro);
 	frob_rodata(&mod->init_layout, set_memory_ro);
@@ -1964,15 +2029,6 @@
 	frob_writable_data(&mod->init_layout, set_memory_nx);
 }
 
-static void module_disable_nx(const struct module *mod)
-{
-	frob_rodata(&mod->core_layout, set_memory_x);
-	frob_ro_after_init(&mod->core_layout, set_memory_x);
-	frob_writable_data(&mod->core_layout, set_memory_x);
-	frob_rodata(&mod->init_layout, set_memory_x);
-	frob_writable_data(&mod->init_layout, set_memory_x);
-}
-
 /* Iterate through all modules and set each module's text as RW */
 void set_all_modules_text_rw(void)
 {
@@ -2016,24 +2072,19 @@
 	}
 	mutex_unlock(&module_mutex);
 }
-
-static void disable_ro_nx(const struct module_layout *layout)
-{
-	if (rodata_enabled) {
-		frob_text(layout, set_memory_rw);
-		frob_rodata(layout, set_memory_rw);
-		frob_ro_after_init(layout, set_memory_rw);
-	}
-	frob_rodata(layout, set_memory_x);
-	frob_ro_after_init(layout, set_memory_x);
-	frob_writable_data(layout, set_memory_x);
-}
-
-#else
-static void disable_ro_nx(const struct module_layout *layout) { }
+#else /* !CONFIG_STRICT_MODULE_RWX */
 static void module_enable_nx(const struct module *mod) { }
-static void module_disable_nx(const struct module *mod) { }
-#endif
+#endif /*  CONFIG_STRICT_MODULE_RWX */
+static void module_enable_x(const struct module *mod)
+{
+	frob_text(&mod->core_layout, set_memory_x);
+	frob_text(&mod->init_layout, set_memory_x);
+}
+#else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */
+static void module_enable_nx(const struct module *mod) { }
+static void module_enable_x(const struct module *mod) { }
+#endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */
+
 
 #ifdef CONFIG_LIVEPATCH
 /*
@@ -2112,6 +2163,11 @@
 
 void __weak module_memfree(void *module_region)
 {
+	/*
+	 * This memory may be RO, and freeing RO memory in an interrupt is not
+	 * supported by vmalloc.
+	 */
+	WARN_ON(in_interrupt());
 	vfree(module_region);
 }
 
@@ -2159,11 +2215,10 @@
 	/* Remove this module from bug list, this uses list_del_rcu */
 	module_bug_cleanup(mod);
 	/* Wait for RCU-sched synchronizing before releasing mod->list and buglist. */
-	synchronize_sched();
+	synchronize_rcu();
 	mutex_unlock(&module_mutex);
 
 	/* This may be empty, but that's OK */
-	disable_ro_nx(&mod->init_layout);
 	module_arch_freeing_init(mod);
 	module_memfree(mod->init_layout.base);
 	kfree(mod->args);
@@ -2173,7 +2228,6 @@
 	lockdep_free_key_range(mod->core_layout.base, mod->core_layout.size);
 
 	/* Finally, free the core (containing the module structure) */
-	disable_ro_nx(&mod->core_layout);
 	module_memfree(mod->core_layout.base);
 }
 
@@ -2198,7 +2252,7 @@
  *
  * You must hold the module_mutex.
  */
-static int verify_export_symbols(struct module *mod)
+static int verify_exported_symbols(struct module *mod)
 {
 	unsigned int i;
 	struct module *owner;
@@ -2477,7 +2531,8 @@
 	return string;
 }
 
-static char *get_modinfo(struct load_info *info, const char *tag)
+static char *get_next_modinfo(const struct load_info *info, const char *tag,
+			      char *prev)
 {
 	char *p;
 	unsigned int taglen = strlen(tag);
@@ -2488,13 +2543,25 @@
 	 * get_modinfo() calls made before rewrite_section_headers()
 	 * must use sh_offset, as sh_addr isn't set!
 	 */
-	for (p = (char *)info->hdr + infosec->sh_offset; p; p = next_string(p, &size)) {
+	char *modinfo = (char *)info->hdr + infosec->sh_offset;
+
+	if (prev) {
+		size -= prev - modinfo;
+		modinfo = next_string(prev, &size);
+	}
+
+	for (p = modinfo; p; p = next_string(p, &size)) {
 		if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
 			return p + taglen + 1;
 	}
 	return NULL;
 }
 
+static char *get_modinfo(const struct load_info *info, const char *tag)
+{
+	return get_next_modinfo(info, tag, NULL);
+}
+
 static void setup_modinfo(struct module *mod, struct load_info *info)
 {
 	struct module_attribute *attr;
@@ -2519,10 +2586,10 @@
 
 #ifdef CONFIG_KALLSYMS
 
-/* lookup symbol in given range of kernel_symbols */
-static const struct kernel_symbol *lookup_symbol(const char *name,
-	const struct kernel_symbol *start,
-	const struct kernel_symbol *stop)
+/* Lookup exported symbol in given range of kernel_symbols */
+static const struct kernel_symbol *lookup_exported_symbol(const char *name,
+							  const struct kernel_symbol *start,
+							  const struct kernel_symbol *stop)
 {
 	return bsearch(name, start, stop - start,
 			sizeof(struct kernel_symbol), cmp_name);
@@ -2533,9 +2600,10 @@
 {
 	const struct kernel_symbol *ks;
 	if (!mod)
-		ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
+		ks = lookup_exported_symbol(name, __start___ksymtab, __stop___ksymtab);
 	else
-		ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
+		ks = lookup_exported_symbol(name, mod->syms, mod->syms + mod->num_syms);
+
 	return ks != NULL && kernel_symbol_value(ks) == value;
 }
 
@@ -2643,6 +2711,8 @@
 	info->symoffs = ALIGN(mod->core_layout.size, symsect->sh_addralign ?: 1);
 	info->stroffs = mod->core_layout.size = info->symoffs + ndst * sizeof(Elf_Sym);
 	mod->core_layout.size += strtab_size;
+	info->core_typeoffs = mod->core_layout.size;
+	mod->core_layout.size += ndst * sizeof(char);
 	mod->core_layout.size = debug_align(mod->core_layout.size);
 
 	/* Put string table section at end of init part of module. */
@@ -2656,6 +2726,8 @@
 				      __alignof__(struct mod_kallsyms));
 	info->mod_kallsyms_init_off = mod->init_layout.size;
 	mod->init_layout.size += sizeof(struct mod_kallsyms);
+	info->init_typeoffs = mod->init_layout.size;
+	mod->init_layout.size += nsrc * sizeof(char);
 	mod->init_layout.size = debug_align(mod->init_layout.size);
 }
 
@@ -2679,20 +2751,23 @@
 	mod->kallsyms->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
 	/* Make sure we get permanent strtab: don't use info->strtab. */
 	mod->kallsyms->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
+	mod->kallsyms->typetab = mod->init_layout.base + info->init_typeoffs;
 
-	/* Set types up while we still have access to sections. */
-	for (i = 0; i < mod->kallsyms->num_symtab; i++)
-		mod->kallsyms->symtab[i].st_info
-			= elf_type(&mod->kallsyms->symtab[i], info);
-
-	/* Now populate the cut down core kallsyms for after init. */
+	/*
+	 * Now populate the cut down core kallsyms for after init
+	 * and set types up while we still have access to sections.
+	 */
 	mod->core_kallsyms.symtab = dst = mod->core_layout.base + info->symoffs;
 	mod->core_kallsyms.strtab = s = mod->core_layout.base + info->stroffs;
+	mod->core_kallsyms.typetab = mod->core_layout.base + info->core_typeoffs;
 	src = mod->kallsyms->symtab;
 	for (ndst = i = 0; i < mod->kallsyms->num_symtab; i++) {
+		mod->kallsyms->typetab[i] = elf_type(src + i, info);
 		if (i == 0 || is_livepatch_module(mod) ||
 		    is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum,
 				   info->index.pcpu)) {
+			mod->core_kallsyms.typetab[ndst] =
+			    mod->kallsyms->typetab[i];
 			dst[ndst] = src[i];
 			dst[ndst++].st_name = s - mod->core_kallsyms.strtab;
 			s += strlcpy(s, &mod->kallsyms->strtab[src[i].st_name],
@@ -2715,11 +2790,7 @@
 {
 	if (!debug)
 		return;
-#ifdef CONFIG_DYNAMIC_DEBUG
-	if (ddebug_add_module(debug, num, mod->name))
-		pr_err("dynamic debug error adding module: %s\n",
-			debug->modname);
-#endif
+	ddebug_add_module(debug, num, mod->name);
 }
 
 static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug)
@@ -2733,6 +2804,11 @@
 	return vmalloc_exec(size);
 }
 
+bool __weak module_exit_section(const char *name)
+{
+	return strstarts(name, ".exit");
+}
+
 #ifdef CONFIG_DEBUG_KMEMLEAK
 static void kmemleak_load_module(const struct module *mod,
 				 const struct load_info *info)
@@ -2763,8 +2839,9 @@
 #ifdef CONFIG_MODULE_SIG
 static int module_sig_check(struct load_info *info, int flags)
 {
-	int err = -ENOKEY;
+	int err = -ENODATA;
 	const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
+	const char *reason;
 	const void *mod = info->hdr;
 
 	/*
@@ -2779,16 +2856,38 @@
 		err = mod_verify_sig(mod, info);
 	}
 
-	if (!err) {
+	switch (err) {
+	case 0:
 		info->sig_ok = true;
 		return 0;
+
+		/* We don't permit modules to be loaded into trusted kernels
+		 * without a valid signature on them, but if we're not
+		 * enforcing, certain errors are non-fatal.
+		 */
+	case -ENODATA:
+		reason = "Loading of unsigned module";
+		goto decide;
+	case -ENOPKG:
+		reason = "Loading of module with unsupported crypto";
+		goto decide;
+	case -ENOKEY:
+		reason = "Loading of module with unavailable key";
+	decide:
+		if (is_module_sig_enforced()) {
+			pr_notice("%s is rejected\n", reason);
+			return -EKEYREJECTED;
+		}
+
+		return security_locked_down(LOCKDOWN_MODULE_SIGNATURE);
+
+		/* All other errors are fatal, including nomem, unparseable
+		 * signatures and signature check failures - even if signatures
+		 * aren't required.
+		 */
+	default:
+		return err;
 	}
-
-	/* Not having a signature is only an error if we're strict. */
-	if (err == -ENOKEY && !is_module_sig_enforced())
-		err = 0;
-
-	return err;
 }
 #else /* !CONFIG_MODULE_SIG */
 static int module_sig_check(struct load_info *info, int flags)
@@ -2922,7 +3021,7 @@
 
 #ifndef CONFIG_MODULE_UNLOAD
 		/* Don't load .exit sections */
-		if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
+		if (module_exit_section(info->secstrings+shdr->sh_name))
 			shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
 #endif
 	}
@@ -3093,7 +3192,17 @@
 					     sizeof(*mod->tracepoints_ptrs),
 					     &mod->num_tracepoints);
 #endif
-#ifdef HAVE_JUMP_LABEL
+#ifdef CONFIG_TREE_SRCU
+	mod->srcu_struct_ptrs = section_objs(info, "___srcu_struct_ptrs",
+					     sizeof(*mod->srcu_struct_ptrs),
+					     &mod->num_srcu_structs);
+#endif
+#ifdef CONFIG_BPF_EVENTS
+	mod->bpf_raw_events = section_objs(info, "__bpf_raw_tp_map",
+					   sizeof(*mod->bpf_raw_events),
+					   &mod->num_bpf_raw_events);
+#endif
+#ifdef CONFIG_JUMP_LABEL
 	mod->jump_entries = section_objs(info, "__jump_table",
 					sizeof(*mod->jump_entries),
 					&mod->num_jump_entries);
@@ -3317,6 +3426,15 @@
 	ndx = find_sec(info, ".data..ro_after_init");
 	if (ndx)
 		info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
+	/*
+	 * Mark the __jump_table section as ro_after_init as well: these data
+	 * structures are never modified, with the exception of entries that
+	 * refer to code in the __init section, which are annotated as such
+	 * at module load time.
+	 */
+	ndx = find_sec(info, "__jump_table");
+	if (ndx)
+		info->sechdrs[ndx].sh_flags |= SHF_RO_AFTER_INIT;
 
 	/* Determine total sizes, and put offsets in sh_entsize.  For now
 	   this is done generically; there doesn't appear to be any
@@ -3381,8 +3499,7 @@
 	sched_annotate_sleep();
 	mutex_lock(&module_mutex);
 	mod = find_module_all(name, strlen(name), true);
-	ret = !mod || mod->state == MODULE_STATE_LIVE
-		|| mod->state == MODULE_STATE_GOING;
+	ret = !mod || mod->state == MODULE_STATE_LIVE;
 	mutex_unlock(&module_mutex);
 
 	return ret;
@@ -3401,17 +3518,34 @@
 
 /* For freeing module_init on success, in case kallsyms traversing */
 struct mod_initfree {
-	struct rcu_head rcu;
+	struct llist_node node;
 	void *module_init;
 };
 
-static void do_free_init(struct rcu_head *head)
+static void do_free_init(struct work_struct *w)
 {
-	struct mod_initfree *m = container_of(head, struct mod_initfree, rcu);
-	module_memfree(m->module_init);
-	kfree(m);
+	struct llist_node *pos, *n, *list;
+	struct mod_initfree *initfree;
+
+	list = llist_del_all(&init_free_list);
+
+	synchronize_rcu();
+
+	llist_for_each_safe(pos, n, list) {
+		initfree = container_of(pos, struct mod_initfree, node);
+		module_memfree(initfree->module_init);
+		kfree(initfree);
+	}
 }
 
+static int __init modules_wq_init(void)
+{
+	INIT_WORK(&init_free_wq, do_free_init);
+	init_llist_head(&init_free_list);
+	return 0;
+}
+module_init(modules_wq_init);
+
 /*
  * This is where the real work happens.
  *
@@ -3488,7 +3622,6 @@
 #endif
 	module_enable_ro(mod, true);
 	mod_tree_remove_init(mod);
-	disable_ro_nx(&mod->init_layout);
 	module_arch_freeing_init(mod);
 	mod->init_layout.base = NULL;
 	mod->init_layout.size = 0;
@@ -3498,15 +3631,19 @@
 	/*
 	 * We want to free module_init, but be aware that kallsyms may be
 	 * walking this with preempt disabled.  In all the failure paths, we
-	 * call synchronize_sched(), but we don't want to slow down the success
-	 * path, so use actual RCU here.
+	 * call synchronize_rcu(), but we don't want to slow down the success
+	 * path. module_memfree() cannot be called in an interrupt, so do the
+	 * work and call synchronize_rcu() in a work queue.
+	 *
 	 * Note that module_alloc() on most architectures creates W+X page
 	 * mappings which won't be cleaned up until do_free_init() runs.  Any
 	 * code such as mark_rodata_ro() which depends on those mappings to
 	 * be cleaned up needs to sync with the queued work - ie
-	 * rcu_barrier_sched()
+	 * rcu_barrier()
 	 */
-	call_rcu_sched(&freeinit->rcu, do_free_init);
+	if (llist_add(&freeinit->node, &init_free_list))
+		schedule_work(&init_free_wq);
+
 	mutex_unlock(&module_mutex);
 	wake_up_all(&module_wq);
 
@@ -3517,7 +3654,7 @@
 fail:
 	/* Try to protect us from buggy refcounters. */
 	mod->state = MODULE_STATE_GOING;
-	synchronize_sched();
+	synchronize_rcu();
 	module_put(mod);
 	blocking_notifier_call_chain(&module_notify_list,
 				     MODULE_STATE_GOING, mod);
@@ -3552,8 +3689,7 @@
 	mutex_lock(&module_mutex);
 	old = find_module_all(mod->name, strlen(mod->name), true);
 	if (old != NULL) {
-		if (old->state == MODULE_STATE_COMING
-		    || old->state == MODULE_STATE_UNFORMED) {
+		if (old->state != MODULE_STATE_LIVE) {
 			/* Wait in case it fails to load. */
 			mutex_unlock(&module_mutex);
 			err = wait_event_interruptible(module_wq,
@@ -3583,7 +3719,7 @@
 	mutex_lock(&module_mutex);
 
 	/* Find duplicate symbols (must be called under lock). */
-	err = verify_export_symbols(mod);
+	err = verify_exported_symbols(mod);
 	if (err < 0)
 		goto out;
 
@@ -3592,6 +3728,7 @@
 
 	module_enable_ro(mod, false);
 	module_enable_nx(mod);
+	module_enable_x(mod);
 
 	/* Mark state as coming so strong_try_module_get() ignores us,
 	 * but kallsyms etc. can see us. */
@@ -3803,14 +3940,10 @@
 	module_bug_cleanup(mod);
 	mutex_unlock(&module_mutex);
 
-	/* we can't deallocate the module until we clear memory protection */
-	module_disable_ro(mod);
-	module_disable_nx(mod);
-
  ddebug_cleanup:
 	ftrace_release_mod(mod);
 	dynamic_debug_remove(mod, info->debug);
-	synchronize_sched();
+	synchronize_rcu();
 	kfree(mod->args);
  free_arch_cleanup:
 	module_arch_cleanup(mod);
@@ -3825,7 +3958,7 @@
 	mod_tree_remove(mod);
 	wake_up_all(&module_wq);
 	/* Wait for RCU-sched synchronizing before releasing mod->list. */
-	synchronize_sched();
+	synchronize_rcu();
 	mutex_unlock(&module_mutex);
  free_module:
 	/* Free lock-classes; relies on the preceding sync_rcu() */
@@ -3902,18 +4035,22 @@
 	       && (str[2] == '\0' || str[2] == '.');
 }
 
-static const char *symname(struct mod_kallsyms *kallsyms, unsigned int symnum)
+static const char *kallsyms_symbol_name(struct mod_kallsyms *kallsyms, unsigned int symnum)
 {
 	return kallsyms->strtab + kallsyms->symtab[symnum].st_name;
 }
 
-static const char *get_ksymbol(struct module *mod,
-			       unsigned long addr,
-			       unsigned long *size,
-			       unsigned long *offset)
+/*
+ * Given a module and address, find the corresponding symbol and return its name
+ * while providing its size and offset if needed.
+ */
+static const char *find_kallsyms_symbol(struct module *mod,
+					unsigned long addr,
+					unsigned long *size,
+					unsigned long *offset)
 {
 	unsigned int i, best = 0;
-	unsigned long nextval;
+	unsigned long nextval, bestval;
 	struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms);
 
 	/* At worse, next value is at end of module */
@@ -3922,34 +4059,40 @@
 	else
 		nextval = (unsigned long)mod->core_layout.base+mod->core_layout.text_size;
 
+	bestval = kallsyms_symbol_value(&kallsyms->symtab[best]);
+
 	/* Scan for closest preceding symbol, and next symbol. (ELF
 	   starts real symbols at 1). */
 	for (i = 1; i < kallsyms->num_symtab; i++) {
-		if (kallsyms->symtab[i].st_shndx == SHN_UNDEF)
+		const Elf_Sym *sym = &kallsyms->symtab[i];
+		unsigned long thisval = kallsyms_symbol_value(sym);
+
+		if (sym->st_shndx == SHN_UNDEF)
 			continue;
 
 		/* We ignore unnamed symbols: they're uninformative
 		 * and inserted at a whim. */
-		if (*symname(kallsyms, i) == '\0'
-		    || is_arm_mapping_symbol(symname(kallsyms, i)))
+		if (*kallsyms_symbol_name(kallsyms, i) == '\0'
+		    || is_arm_mapping_symbol(kallsyms_symbol_name(kallsyms, i)))
 			continue;
 
-		if (kallsyms->symtab[i].st_value <= addr
-		    && kallsyms->symtab[i].st_value > kallsyms->symtab[best].st_value)
+		if (thisval <= addr && thisval > bestval) {
 			best = i;
-		if (kallsyms->symtab[i].st_value > addr
-		    && kallsyms->symtab[i].st_value < nextval)
-			nextval = kallsyms->symtab[i].st_value;
+			bestval = thisval;
+		}
+		if (thisval > addr && thisval < nextval)
+			nextval = thisval;
 	}
 
 	if (!best)
 		return NULL;
 
 	if (size)
-		*size = nextval - kallsyms->symtab[best].st_value;
+		*size = nextval - bestval;
 	if (offset)
-		*offset = addr - kallsyms->symtab[best].st_value;
-	return symname(kallsyms, best);
+		*offset = addr - bestval;
+
+	return kallsyms_symbol_name(kallsyms, best);
 }
 
 void * __weak dereference_module_function_descriptor(struct module *mod,
@@ -3974,7 +4117,8 @@
 	if (mod) {
 		if (modname)
 			*modname = mod->name;
-		ret = get_ksymbol(mod, addr, size, offset);
+
+		ret = find_kallsyms_symbol(mod, addr, size, offset);
 	}
 	/* Make a copy in here where it's safe */
 	if (ret) {
@@ -3997,9 +4141,10 @@
 		if (within_module(addr, mod)) {
 			const char *sym;
 
-			sym = get_ksymbol(mod, addr, NULL, NULL);
+			sym = find_kallsyms_symbol(mod, addr, NULL, NULL);
 			if (!sym)
 				goto out;
+
 			strlcpy(symname, sym, KSYM_NAME_LEN);
 			preempt_enable();
 			return 0;
@@ -4022,7 +4167,7 @@
 		if (within_module(addr, mod)) {
 			const char *sym;
 
-			sym = get_ksymbol(mod, addr, size, offset);
+			sym = find_kallsyms_symbol(mod, addr, size, offset);
 			if (!sym)
 				goto out;
 			if (modname)
@@ -4051,9 +4196,11 @@
 			continue;
 		kallsyms = rcu_dereference_sched(mod->kallsyms);
 		if (symnum < kallsyms->num_symtab) {
-			*value = kallsyms->symtab[symnum].st_value;
-			*type = kallsyms->symtab[symnum].st_info;
-			strlcpy(name, symname(kallsyms, symnum), KSYM_NAME_LEN);
+			const Elf_Sym *sym = &kallsyms->symtab[symnum];
+
+			*value = kallsyms_symbol_value(sym);
+			*type = kallsyms->typetab[symnum];
+			strlcpy(name, kallsyms_symbol_name(kallsyms, symnum), KSYM_NAME_LEN);
 			strlcpy(module_name, mod->name, MODULE_NAME_LEN);
 			*exported = is_exported(name, *value, mod);
 			preempt_enable();
@@ -4065,15 +4212,19 @@
 	return -ERANGE;
 }
 
-static unsigned long mod_find_symname(struct module *mod, const char *name)
+/* Given a module and name of symbol, find and return the symbol's value */
+static unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name)
 {
 	unsigned int i;
 	struct mod_kallsyms *kallsyms = rcu_dereference_sched(mod->kallsyms);
 
-	for (i = 0; i < kallsyms->num_symtab; i++)
-		if (strcmp(name, symname(kallsyms, i)) == 0 &&
-		    kallsyms->symtab[i].st_shndx != SHN_UNDEF)
-			return kallsyms->symtab[i].st_value;
+	for (i = 0; i < kallsyms->num_symtab; i++) {
+		const Elf_Sym *sym = &kallsyms->symtab[i];
+
+		if (strcmp(name, kallsyms_symbol_name(kallsyms, i)) == 0 &&
+		    sym->st_shndx != SHN_UNDEF)
+			return kallsyms_symbol_value(sym);
+	}
 	return 0;
 }
 
@@ -4088,12 +4239,12 @@
 	preempt_disable();
 	if ((colon = strnchr(name, MODULE_NAME_LEN, ':')) != NULL) {
 		if ((mod = find_module_all(name, colon - name, false)) != NULL)
-			ret = mod_find_symname(mod, colon+1);
+			ret = find_kallsyms_symbol_value(mod, colon+1);
 	} else {
 		list_for_each_entry_rcu(mod, &modules, list) {
 			if (mod->state == MODULE_STATE_UNFORMED)
 				continue;
-			if ((ret = mod_find_symname(mod, name)) != 0)
+			if ((ret = find_kallsyms_symbol_value(mod, name)) != 0)
 				break;
 		}
 	}
@@ -4118,12 +4269,13 @@
 		if (mod->state == MODULE_STATE_UNFORMED)
 			continue;
 		for (i = 0; i < kallsyms->num_symtab; i++) {
+			const Elf_Sym *sym = &kallsyms->symtab[i];
 
-			if (kallsyms->symtab[i].st_shndx == SHN_UNDEF)
+			if (sym->st_shndx == SHN_UNDEF)
 				continue;
 
-			ret = fn(data, symname(kallsyms, i),
-				 mod, kallsyms->symtab[i].st_value);
+			ret = fn(data, kallsyms_symbol_name(kallsyms, i),
+				 mod, kallsyms_symbol_value(sym));
 			if (ret != 0)
 				return ret;
 		}