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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (C) 2002 Richard Henderson
  * Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
  */
 
 #define INCLUDE_VERMAGIC
 
 #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>
 #include <linux/buildid.h>
 #include <linux/fs.h>
 #include <linux/kernel.h>
 #include <linux/kernel_read_file.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/elf.h>
 #include <linux/seq_file.h>
 #include <linux/syscalls.h>
 #include <linux/fcntl.h>
 #include <linux/rcupdate.h>
 #include <linux/capability.h>
 #include <linux/cpu.h>
 #include <linux/moduleparam.h>
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/vermagic.h>
 #include <linux/notifier.h>
 #include <linux/sched.h>
 #include <linux/device.h>
 #include <linux/string.h>
 #include <linux/mutex.h>
 #include <linux/rculist.h>
 #include <linux/uaccess.h>
 #include <asm/cacheflush.h>
 #include <linux/set_memory.h>
 #include <asm/mmu_context.h>
 #include <linux/license.h>
 #include <asm/sections.h>
 #include <linux/tracepoint.h>
 #include <linux/ftrace.h>
 #include <linux/livepatch.h>
 #include <linux/async.h>
 #include <linux/percpu.h>
 #include <linux/kmemleak.h>
 #include <linux/jump_label.h>
 #include <linux/pfn.h>
 #include <linux/bsearch.h>
 #include <linux/dynamic_debug.h>
 #include <linux/audit.h>
 #include <uapi/linux/module.h>
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/module.h>
 
 /*
  * Mutex protects:
  * 1) List of modules (also safely readable with preempt_disable),
  * 2) module_use links,
  * 3) mod_tree.addr_min/mod_tree.addr_max.
  * (delete and add uses RCU list operations).
  */
 DEFINE_MUTEX(module_mutex);
 LIST_HEAD(modules);
 
 /* Work queue for freeing init sections in success case */
 static void do_free_init(struct work_struct *w);
 static DECLARE_WORK(init_free_wq, do_free_init);
 static LLIST_HEAD(init_free_list);
 
 struct mod_tree_root mod_tree __cacheline_aligned = {
     .addr_min = -1UL,
 };
 
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
 struct mod_tree_root mod_data_tree __cacheline_aligned = {
     .addr_min = -1UL,
 };
 #endif
 
 #define module_addr_min mod_tree.addr_min
 #define module_addr_max mod_tree.addr_max
 
 struct symsearch {
     const struct kernel_symbol *start, *stop;
     const s32 *crcs;
     enum mod_license license;
 };
 
 /*
  * Bounds of module text, for speeding up __module_address.
  * Protected by module_mutex.
  */
 static void __mod_update_bounds(void *base, unsigned int size, struct mod_tree_root *tree)
 {
     unsigned long min = (unsigned long)base;
     unsigned long max = min + size;
 
     if (min < tree->addr_min)
         tree->addr_min = min;
     if (max > tree->addr_max)
         tree->addr_max = max;
 }
 
 static void mod_update_bounds(struct module *mod)
 {
     __mod_update_bounds(mod->core_layout.base, mod->core_layout.size, &mod_tree);
     if (mod->init_layout.size)
         __mod_update_bounds(mod->init_layout.base, mod->init_layout.size, &mod_tree);
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
     __mod_update_bounds(mod->data_layout.base, mod->data_layout.size, &mod_data_tree);
 #endif
 }
 
 /* Block module loading/unloading? */
 int modules_disabled;
 core_param(nomodule, modules_disabled, bint, 0);
 
 /* Waiting for a module to finish initializing? */
 static DECLARE_WAIT_QUEUE_HEAD(module_wq);
 
 static BLOCKING_NOTIFIER_HEAD(module_notify_list);
 
 int register_module_notifier(struct notifier_block *nb)
 {
     return blocking_notifier_chain_register(&module_notify_list, nb);
 }
 EXPORT_SYMBOL(register_module_notifier);
 
 int unregister_module_notifier(struct notifier_block *nb)
 {
     return blocking_notifier_chain_unregister(&module_notify_list, nb);
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
 /*
  * We require a truly strong try_module_get(): 0 means success.
  * Otherwise an error is returned due to ongoing or failed
  * initialization etc.
  */
 static inline int strong_try_module_get(struct module *mod)
 {
     BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
     if (mod && mod->state == MODULE_STATE_COMING)
         return -EBUSY;
     if (try_module_get(mod))
         return 0;
     else
         return -ENOENT;
 }
 
 static inline void add_taint_module(struct module *mod, unsigned flag,
                     enum lockdep_ok lockdep_ok)
 {
     add_taint(flag, lockdep_ok);
     set_bit(flag, &mod->taints);
 }
 
 /*
  * A thread that wants to hold a reference to a module only while it
  * is running can call this to safely exit.
  */
 void __noreturn __module_put_and_kthread_exit(struct module *mod, long code)
 {
     module_put(mod);
     kthread_exit(code);
 }
 EXPORT_SYMBOL(__module_put_and_kthread_exit);
 
 /* Find a module section: 0 means not found. */
 static unsigned int find_sec(const struct load_info *info, const char *name)
 {
     unsigned int i;
 
     for (i = 1; i < info->hdr->e_shnum; i++) {
         Elf_Shdr *shdr = &info->sechdrs[i];
         /* Alloc bit cleared means "ignore it." */
         if ((shdr->sh_flags & SHF_ALLOC)
             && strcmp(info->secstrings + shdr->sh_name, name) == 0)
             return i;
     }
     return 0;
 }
 
 /* Find a module section, or NULL. */
 static void *section_addr(const struct load_info *info, const char *name)
 {
     /* Section 0 has sh_addr 0. */
     return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
 }
 
 /* Find a module section, or NULL.  Fill in number of "objects" in section. */
 static void *section_objs(const struct load_info *info,
               const char *name,
               size_t object_size,
               unsigned int *num)
 {
     unsigned int sec = find_sec(info, name);
 
     /* Section 0 has sh_addr 0 and sh_size 0. */
     *num = info->sechdrs[sec].sh_size / object_size;
     return (void *)info->sechdrs[sec].sh_addr;
 }
 
 /* Find a module section: 0 means not found. Ignores SHF_ALLOC flag. */
 static unsigned int find_any_sec(const struct load_info *info, const char *name)
 {
     unsigned int i;
 
     for (i = 1; i < info->hdr->e_shnum; i++) {
         Elf_Shdr *shdr = &info->sechdrs[i];
         if (strcmp(info->secstrings + shdr->sh_name, name) == 0)
             return i;
     }
     return 0;
 }
 
 /*
  * Find a module section, or NULL. Fill in number of "objects" in section.
  * Ignores SHF_ALLOC flag.
  */
 static __maybe_unused void *any_section_objs(const struct load_info *info,
                          const char *name,
                          size_t object_size,
                          unsigned int *num)
 {
     unsigned int sec = find_any_sec(info, name);
 
     /* Section 0 has sh_addr 0 and sh_size 0. */
     *num = info->sechdrs[sec].sh_size / object_size;
     return (void *)info->sechdrs[sec].sh_addr;
 }
 
 #ifndef CONFIG_MODVERSIONS
 #define symversion(base, idx) NULL
 #else
 #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
 #endif
 
 static const char *kernel_symbol_name(const struct kernel_symbol *sym)
 {
 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
     return offset_to_ptr(&sym->name_offset);
 #else
     return sym->name;
 #endif
 }
 
 static const char *kernel_symbol_namespace(const struct kernel_symbol *sym)
 {
 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
     if (!sym->namespace_offset)
         return NULL;
     return offset_to_ptr(&sym->namespace_offset);
 #else
     return sym->namespace;
 #endif
 }
 
 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,
                         struct find_symbol_arg *fsa)
 {
     struct kernel_symbol *sym;
 
     if (!fsa->gplok && syms->license == GPL_ONLY)
         return false;
 
     sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
             sizeof(struct kernel_symbol), cmp_name);
     if (!sym)
         return false;
 
     fsa->owner = owner;
     fsa->crc = symversion(syms->crcs, sym - syms->start);
     fsa->sym = sym;
     fsa->license = syms->license;
 
     return true;
 }
 
 /*
  * Find an exported symbol and return it, along with, (optional) crc and
  * (optional) module which owns it.  Needs preempt disabled or module_mutex.
  */
 bool find_symbol(struct find_symbol_arg *fsa)
 {
     static const struct symsearch arr[] = {
         { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
           NOT_GPL_ONLY },
         { __start___ksymtab_gpl, __stop___ksymtab_gpl,
           __start___kcrctab_gpl,
           GPL_ONLY },
     };
     struct module *mod;
     unsigned int i;
 
     module_assert_mutex_or_preempt();
 
     for (i = 0; i < ARRAY_SIZE(arr); i++)
         if (find_exported_symbol_in_section(&arr[i], NULL, fsa))
             return true;
 
     list_for_each_entry_rcu(mod, &modules, list,
                 lockdep_is_held(&module_mutex)) {
         struct symsearch arr[] = {
             { mod->syms, mod->syms + mod->num_syms, mod->crcs,
               NOT_GPL_ONLY },
             { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
               mod->gpl_crcs,
               GPL_ONLY },
         };
 
         if (mod->state == MODULE_STATE_UNFORMED)
             continue;
 
         for (i = 0; i < ARRAY_SIZE(arr); i++)
             if (find_exported_symbol_in_section(&arr[i], mod, fsa))
                 return true;
     }
 
     pr_debug("Failed to find symbol %s\n", fsa->name);
     return false;
 }
 
 /*
  * Search for module by name: must hold module_mutex (or preempt disabled
  * for read-only access).
  */
 struct module *find_module_all(const char *name, size_t len,
                    bool even_unformed)
 {
     struct module *mod;
 
     module_assert_mutex_or_preempt();
 
     list_for_each_entry_rcu(mod, &modules, list,
                 lockdep_is_held(&module_mutex)) {
         if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
             continue;
         if (strlen(mod->name) == len && !memcmp(mod->name, name, len))
             return mod;
     }
     return NULL;
 }
 
 struct module *find_module(const char *name)
 {
     return find_module_all(name, strlen(name), false);
 }
 
 #ifdef CONFIG_SMP
 
 static inline void __percpu *mod_percpu(struct module *mod)
 {
     return mod->percpu;
 }
 
 static int percpu_modalloc(struct module *mod, struct load_info *info)
 {
     Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu];
     unsigned long align = pcpusec->sh_addralign;
 
     if (!pcpusec->sh_size)
         return 0;
 
     if (align > PAGE_SIZE) {
         pr_warn("%s: per-cpu alignment %li > %li\n",
             mod->name, align, PAGE_SIZE);
         align = PAGE_SIZE;
     }
 
     mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align);
     if (!mod->percpu) {
         pr_warn("%s: Could not allocate %lu bytes percpu data\n",
             mod->name, (unsigned long)pcpusec->sh_size);
         return -ENOMEM;
     }
     mod->percpu_size = pcpusec->sh_size;
     return 0;
 }
 
 static void percpu_modfree(struct module *mod)
 {
     free_percpu(mod->percpu);
 }
 
 static unsigned int find_pcpusec(struct load_info *info)
 {
     return find_sec(info, ".data..percpu");
 }
 
 static void percpu_modcopy(struct module *mod,
                const void *from, unsigned long size)
 {
     int cpu;
 
     for_each_possible_cpu(cpu)
         memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
 }
 
 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 {
     struct module *mod;
     unsigned int cpu;
 
     preempt_disable();
 
     list_for_each_entry_rcu(mod, &modules, list) {
         if (mod->state == MODULE_STATE_UNFORMED)
             continue;
         if (!mod->percpu_size)
             continue;
         for_each_possible_cpu(cpu) {
             void *start = per_cpu_ptr(mod->percpu, cpu);
             void *va = (void *)addr;
 
             if (va >= start && va < start + mod->percpu_size) {
                 if (can_addr) {
                     *can_addr = (unsigned long) (va - start);
                     *can_addr += (unsigned long)
                         per_cpu_ptr(mod->percpu,
                                 get_boot_cpu_id());
                 }
                 preempt_enable();
                 return true;
             }
         }
     }
 
     preempt_enable();
     return false;
 }
 
 /**
  * is_module_percpu_address() - test whether address is from module static percpu
  * @addr: address to test
  *
  * Test whether @addr belongs to module static percpu area.
  *
  * Return: %true if @addr is from module static percpu area
  */
 bool is_module_percpu_address(unsigned long addr)
 {
     return __is_module_percpu_address(addr, NULL);
 }
 
 #else /* ... !CONFIG_SMP */
 
 static inline void __percpu *mod_percpu(struct module *mod)
 {
     return NULL;
 }
 static int percpu_modalloc(struct module *mod, struct load_info *info)
 {
     /* UP modules shouldn't have this section: ENOMEM isn't quite right */
     if (info->sechdrs[info->index.pcpu].sh_size != 0)
         return -ENOMEM;
     return 0;
 }
 static inline void percpu_modfree(struct module *mod)
 {
 }
 static unsigned int find_pcpusec(struct load_info *info)
 {
     return 0;
 }
 static inline void percpu_modcopy(struct module *mod,
                   const void *from, unsigned long size)
 {
     /* pcpusec should be 0, and size of that section should be 0. */
     BUG_ON(size != 0);
 }
 bool is_module_percpu_address(unsigned long addr)
 {
     return false;
 }
 
 bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 {
     return false;
 }
 
 #endif /* CONFIG_SMP */
 
 #define MODINFO_ATTR(field) \
 static void setup_modinfo_##field(struct module *mod, const char *s)  \
 {                                                                     \
     mod->field = kstrdup(s, GFP_KERNEL);                          \
 }                                                                     \
 static ssize_t show_modinfo_##field(struct module_attribute *mattr,   \
             struct module_kobject *mk, char *buffer)      \
 {                                                                     \
     return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field);  \
 }                                                                     \
 static int modinfo_##field##_exists(struct module *mod)               \
 {                                                                     \
     return mod->field != NULL;                                    \
 }                                                                     \
 static void free_modinfo_##field(struct module *mod)                  \
 {                                                                     \
     kfree(mod->field);                                            \
     mod->field = NULL;                                            \
 }                                                                     \
 static struct module_attribute modinfo_##field = {                    \
     .attr = { .name = __stringify(field), .mode = 0444 },         \
     .show = show_modinfo_##field,                                 \
     .setup = setup_modinfo_##field,                               \
     .test = modinfo_##field##_exists,                             \
     .free = free_modinfo_##field,                                 \
 };
 
 MODINFO_ATTR(version);
 MODINFO_ATTR(srcversion);
 
 static struct {
     char name[MODULE_NAME_LEN + 1];
     char taints[MODULE_FLAGS_BUF_SIZE];
 } last_unloaded_module;
 
 #ifdef CONFIG_MODULE_UNLOAD
 
 EXPORT_TRACEPOINT_SYMBOL(module_get);
 
 /* MODULE_REF_BASE is the base reference count by kmodule loader. */
 #define MODULE_REF_BASE 1
 
 /* Init the unload section of the module. */
 static int module_unload_init(struct module *mod)
 {
     /*
      * Initialize reference counter to MODULE_REF_BASE.
      * refcnt == 0 means module is going.
      */
     atomic_set(&mod->refcnt, MODULE_REF_BASE);
 
     INIT_LIST_HEAD(&mod->source_list);
     INIT_LIST_HEAD(&mod->target_list);
 
     /* Hold reference count during initialization. */
     atomic_inc(&mod->refcnt);
 
     return 0;
 }
 
 /* Does a already use b? */
 static int already_uses(struct module *a, struct module *b)
 {
     struct module_use *use;
 
     list_for_each_entry(use, &b->source_list, source_list) {
         if (use->source == a) {
             pr_debug("%s uses %s!\n", a->name, b->name);
             return 1;
         }
     }
     pr_debug("%s does not use %s!\n", a->name, b->name);
     return 0;
 }
 
 /*
  * Module a uses b
  *  - we add 'a' as a "source", 'b' as a "target" of module use
  *  - the module_use is added to the list of 'b' sources (so
  *    'b' can walk the list to see who sourced them), and of 'a'
  *    targets (so 'a' can see what modules it targets).
  */
 static int add_module_usage(struct module *a, struct module *b)
 {
     struct module_use *use;
 
     pr_debug("Allocating new usage for %s.\n", a->name);
     use = kmalloc(sizeof(*use), GFP_ATOMIC);
     if (!use)
         return -ENOMEM;
 
     use->source = a;
     use->target = b;
     list_add(&use->source_list, &b->source_list);
     list_add(&use->target_list, &a->target_list);
     return 0;
 }
 
 /* Module a uses b: caller needs module_mutex() */
 static int ref_module(struct module *a, struct module *b)
 {
     int err;
 
     if (b == NULL || already_uses(a, b))
         return 0;
 
     /* If module isn't available, we fail. */
     err = strong_try_module_get(b);
     if (err)
         return err;
 
     err = add_module_usage(a, b);
     if (err) {
         module_put(b);
         return err;
     }
     return 0;
 }
 
 /* Clear the unload stuff of the module. */
 static void module_unload_free(struct module *mod)
 {
     struct module_use *use, *tmp;
 
     mutex_lock(&module_mutex);
     list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
         struct module *i = use->target;
         pr_debug("%s unusing %s\n", mod->name, i->name);
         module_put(i);
         list_del(&use->source_list);
         list_del(&use->target_list);
         kfree(use);
     }
     mutex_unlock(&module_mutex);
 }
 
 #ifdef CONFIG_MODULE_FORCE_UNLOAD
 static inline int try_force_unload(unsigned int flags)
 {
     int ret = (flags & O_TRUNC);
     if (ret)
         add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
     return ret;
 }
 #else
 static inline int try_force_unload(unsigned int flags)
 {
     return 0;
 }
 #endif /* CONFIG_MODULE_FORCE_UNLOAD */
 
 /* Try to release refcount of module, 0 means success. */
 static int try_release_module_ref(struct module *mod)
 {
     int ret;
 
     /* Try to decrement refcnt which we set at loading */
     ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt);
     BUG_ON(ret < 0);
     if (ret)
         /* Someone can put this right now, recover with checking */
         ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0);
 
     return ret;
 }
 
 static int try_stop_module(struct module *mod, int flags, int *forced)
 {
     /* If it's not unused, quit unless we're forcing. */
     if (try_release_module_ref(mod) != 0) {
         *forced = try_force_unload(flags);
         if (!(*forced))
             return -EWOULDBLOCK;
     }
 
     /* Mark it as dying. */
     mod->state = MODULE_STATE_GOING;
 
     return 0;
 }
 
 /**
  * module_refcount() - return the refcount or -1 if unloading
  * @mod:    the module we're checking
  *
  * Return:
  *  -1 if the module is in the process of unloading
  *  otherwise the number of references in the kernel to the module
  */
 int module_refcount(struct module *mod)
 {
     return atomic_read(&mod->refcnt) - MODULE_REF_BASE;
 }
 EXPORT_SYMBOL(module_refcount);
 
 /* This exists whether we can unload or not */
 static void free_module(struct module *mod);
 
 SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
         unsigned int, flags)
 {
     struct module *mod;
     char name[MODULE_NAME_LEN];
     char buf[MODULE_FLAGS_BUF_SIZE];
     int ret, forced = 0;
 
     if (!capable(CAP_SYS_MODULE) || modules_disabled)
         return -EPERM;
 
     if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
         return -EFAULT;
     name[MODULE_NAME_LEN-1] = '\0';
 
     audit_log_kern_module(name);
 
     if (mutex_lock_interruptible(&module_mutex) != 0)
         return -EINTR;
 
     mod = find_module(name);
     if (!mod) {
         ret = -ENOENT;
         goto out;
     }
 
     if (!list_empty(&mod->source_list)) {
         /* Other modules depend on us: get rid of them first. */
         ret = -EWOULDBLOCK;
         goto out;
     }
 
     /* Doing init or already dying? */
     if (mod->state != MODULE_STATE_LIVE) {
         /* FIXME: if (force), slam module count damn the torpedoes */
         pr_debug("%s already dying\n", mod->name);
         ret = -EBUSY;
         goto out;
     }
 
     /* If it has an init func, it must have an exit func to unload */
     if (mod->init && !mod->exit) {
         forced = try_force_unload(flags);
         if (!forced) {
             /* This module can't be removed */
             ret = -EBUSY;
             goto out;
         }
     }
 
     ret = try_stop_module(mod, flags, &forced);
     if (ret != 0)
         goto out;
 
     mutex_unlock(&module_mutex);
     /* Final destruction now no one is using it. */
     if (mod->exit != NULL)
         mod->exit();
     blocking_notifier_call_chain(&module_notify_list,
                      MODULE_STATE_GOING, mod);
     klp_module_going(mod);
     ftrace_release_mod(mod);
 
     async_synchronize_full();
 
     /* Store the name and taints of the last unloaded module for diagnostic purposes */
     strscpy(last_unloaded_module.name, mod->name, sizeof(last_unloaded_module.name));
     strscpy(last_unloaded_module.taints, module_flags(mod, buf, false), sizeof(last_unloaded_module.taints));
 
     free_module(mod);
     /* someone could wait for the module in add_unformed_module() */
     wake_up_all(&module_wq);
     return 0;
 out:
     mutex_unlock(&module_mutex);
     return ret;
 }
 
 void __symbol_put(const char *symbol)
 {
     struct find_symbol_arg fsa = {
         .name   = symbol,
         .gplok  = true,
     };
 
     preempt_disable();
     BUG_ON(!find_symbol(&fsa));
     module_put(fsa.owner);
     preempt_enable();
 }
 EXPORT_SYMBOL(__symbol_put);
 
 /* Note this assumes addr is a function, which it currently always is. */
 void symbol_put_addr(void *addr)
 {
     struct module *modaddr;
     unsigned long a = (unsigned long)dereference_function_descriptor(addr);
 
     if (core_kernel_text(a))
         return;
 
     /*
      * Even though we hold a reference on the module; we still need to
      * disable preemption in order to safely traverse the data structure.
      */
     preempt_disable();
     modaddr = __module_text_address(a);
     BUG_ON(!modaddr);
     module_put(modaddr);
     preempt_enable();
 }
 EXPORT_SYMBOL_GPL(symbol_put_addr);
 
 static ssize_t show_refcnt(struct module_attribute *mattr,
                struct module_kobject *mk, char *buffer)
 {
     return sprintf(buffer, "%i\n", module_refcount(mk->mod));
 }
 
 static struct module_attribute modinfo_refcnt =
     __ATTR(refcnt, 0444, show_refcnt, NULL);
 
 void __module_get(struct module *module)
 {
     if (module) {
         preempt_disable();
         atomic_inc(&module->refcnt);
         trace_module_get(module, _RET_IP_);
         preempt_enable();
     }
 }
 EXPORT_SYMBOL(__module_get);
 
 bool try_module_get(struct module *module)
 {
     bool ret = true;
 
     if (module) {
         preempt_disable();
         /* Note: here, we can fail to get a reference */
         if (likely(module_is_live(module) &&
                atomic_inc_not_zero(&module->refcnt) != 0))
             trace_module_get(module, _RET_IP_);
         else
             ret = false;
 
         preempt_enable();
     }
     return ret;
 }
 EXPORT_SYMBOL(try_module_get);
 
 void module_put(struct module *module)
 {
     int ret;
 
     if (module) {
         preempt_disable();
         ret = atomic_dec_if_positive(&module->refcnt);
         WARN_ON(ret < 0);   /* Failed to put refcount */
         trace_module_put(module, _RET_IP_);
         preempt_enable();
     }
 }
 EXPORT_SYMBOL(module_put);
 
 #else /* !CONFIG_MODULE_UNLOAD */
 static inline void module_unload_free(struct module *mod)
 {
 }
 
 static int ref_module(struct module *a, struct module *b)
 {
     return strong_try_module_get(b);
 }
 
 static inline int module_unload_init(struct module *mod)
 {
     return 0;
 }
 #endif /* CONFIG_MODULE_UNLOAD */
 
 size_t module_flags_taint(unsigned long taints, char *buf)
 {
     size_t l = 0;
     int i;
 
     for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
         if (taint_flags[i].module && test_bit(i, &taints))
             buf[l++] = taint_flags[i].c_true;
     }
 
     return l;
 }
 
 static ssize_t show_initstate(struct module_attribute *mattr,
                   struct module_kobject *mk, char *buffer)
 {
     const char *state = "unknown";
 
     switch (mk->mod->state) {
     case MODULE_STATE_LIVE:
         state = "live";
         break;
     case MODULE_STATE_COMING:
         state = "coming";
         break;
     case MODULE_STATE_GOING:
         state = "going";
         break;
     default:
         BUG();
     }
     return sprintf(buffer, "%s\n", state);
 }
 
 static struct module_attribute modinfo_initstate =
     __ATTR(initstate, 0444, show_initstate, NULL);
 
 static ssize_t store_uevent(struct module_attribute *mattr,
                 struct module_kobject *mk,
                 const char *buffer, size_t count)
 {
     int rc;
 
     rc = kobject_synth_uevent(&mk->kobj, buffer, count);
     return rc ? rc : count;
 }
 
 struct module_attribute module_uevent =
     __ATTR(uevent, 0200, NULL, store_uevent);
 
 static ssize_t show_coresize(struct module_attribute *mattr,
                  struct module_kobject *mk, char *buffer)
 {
     return sprintf(buffer, "%u\n", mk->mod->core_layout.size);
 }
 
 static struct module_attribute modinfo_coresize =
     __ATTR(coresize, 0444, show_coresize, NULL);
 
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
 static ssize_t show_datasize(struct module_attribute *mattr,
                  struct module_kobject *mk, char *buffer)
 {
     return sprintf(buffer, "%u\n", mk->mod->data_layout.size);
 }
 
 static struct module_attribute modinfo_datasize =
     __ATTR(datasize, 0444, show_datasize, NULL);
 #endif
 
 static ssize_t show_initsize(struct module_attribute *mattr,
                  struct module_kobject *mk, char *buffer)
 {
     return sprintf(buffer, "%u\n", mk->mod->init_layout.size);
 }
 
 static struct module_attribute modinfo_initsize =
     __ATTR(initsize, 0444, show_initsize, NULL);
 
 static ssize_t show_taint(struct module_attribute *mattr,
               struct module_kobject *mk, char *buffer)
 {
     size_t l;
 
     l = module_flags_taint(mk->mod->taints, buffer);
     buffer[l++] = '\n';
     return l;
 }
 
 static struct module_attribute modinfo_taint =
     __ATTR(taint, 0444, show_taint, NULL);
 
 struct module_attribute *modinfo_attrs[] = {
     &module_uevent,
     &modinfo_version,
     &modinfo_srcversion,
     &modinfo_initstate,
     &modinfo_coresize,
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
     &modinfo_datasize,
 #endif
     &modinfo_initsize,
     &modinfo_taint,
 #ifdef CONFIG_MODULE_UNLOAD
     &modinfo_refcnt,
 #endif
     NULL,
 };
 
 size_t modinfo_attrs_count = ARRAY_SIZE(modinfo_attrs);
 
 static const char vermagic[] = VERMAGIC_STRING;
 
 int try_to_force_load(struct module *mod, const char *reason)
 {
 #ifdef CONFIG_MODULE_FORCE_LOAD
     if (!test_taint(TAINT_FORCED_MODULE))
         pr_warn("%s: %s: kernel tainted.\n", mod->name, reason);
     add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE);
     return 0;
 #else
     return -ENOEXEC;
 #endif
 }
 
 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 && namespace[0]) {
         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;
 }
 
 static bool inherit_taint(struct module *mod, struct module *owner, const char *name)
 {
     if (!owner || !test_bit(TAINT_PROPRIETARY_MODULE, &owner->taints))
         return true;
 
     if (mod->using_gplonly_symbols) {
         pr_err("%s: module using GPL-only symbols uses symbols %s from proprietary module %s.\n",
             mod->name, name, owner->name);
         return false;
     }
 
     if (!test_bit(TAINT_PROPRIETARY_MODULE, &mod->taints)) {
         pr_warn("%s: module uses symbols %s from proprietary module %s, inheriting taint.\n",
             mod->name, name, owner->name);
         set_bit(TAINT_PROPRIETARY_MODULE, &mod->taints);
     }
     return true;
 }
 
 /* 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,
                           const char *name,
                           char ownername[])
 {
     struct find_symbol_arg fsa = {
         .name   = name,
         .gplok  = !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)),
         .warn   = true,
     };
     int err;
 
     /*
      * The module_mutex should not be a heavily contended lock;
      * if we get the occasional sleep here, we'll go an extra iteration
      * in the wait_event_interruptible(), which is harmless.
      */
     sched_annotate_sleep();
     mutex_lock(&module_mutex);
     if (!find_symbol(&fsa))
         goto unlock;
 
     if (fsa.license == GPL_ONLY)
         mod->using_gplonly_symbols = true;
 
     if (!inherit_taint(mod, fsa.owner, name)) {
         fsa.sym = NULL;
         goto getname;
     }
 
     if (!check_version(info, name, mod, fsa.crc)) {
         fsa.sym = ERR_PTR(-EINVAL);
         goto getname;
     }
 
     err = verify_namespace_is_imported(info, fsa.sym, mod);
     if (err) {
         fsa.sym = ERR_PTR(err);
         goto getname;
     }
 
     err = ref_module(mod, fsa.owner);
     if (err) {
         fsa.sym = ERR_PTR(err);
         goto getname;
     }
 
 getname:
     /* We must make copy under the lock if we failed to get ref. */
     strncpy(ownername, module_name(fsa.owner), MODULE_NAME_LEN);
 unlock:
     mutex_unlock(&module_mutex);
     return fsa.sym;
 }
 
 static const struct kernel_symbol *
 resolve_symbol_wait(struct module *mod,
             const struct load_info *info,
             const char *name)
 {
     const struct kernel_symbol *ksym;
     char owner[MODULE_NAME_LEN];
 
     if (wait_event_interruptible_timeout(module_wq,
             !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
             || PTR_ERR(ksym) != -EBUSY,
                          30 * HZ) <= 0) {
         pr_warn("%s: gave up waiting for init of module %s.\n",
             mod->name, owner);
     }
     return ksym;
 }
 
 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);
 }
 
 void __weak module_arch_cleanup(struct module *mod)
 {
 }
 
 void __weak module_arch_freeing_init(struct module *mod)
 {
 }
 
 static void cfi_cleanup(struct module *mod);
 
 /* Free a module, remove from lists, etc. */
 static void free_module(struct module *mod)
 {
     trace_module_free(mod);
 
     mod_sysfs_teardown(mod);
 
     /*
      * We leave it in list to prevent duplicate loads, but make sure
      * that noone uses it while it's being deconstructed.
      */
     mutex_lock(&module_mutex);
     mod->state = MODULE_STATE_UNFORMED;
     mutex_unlock(&module_mutex);
 
     /* Remove dynamic debug info */
     ddebug_remove_module(mod->name);
 
     /* Arch-specific cleanup. */
     module_arch_cleanup(mod);
 
     /* Module unload stuff */
     module_unload_free(mod);
 
     /* Free any allocated parameters. */
     destroy_params(mod->kp, mod->num_kp);
 
     if (is_livepatch_module(mod))
         free_module_elf(mod);
 
     /* Now we can delete it from the lists */
     mutex_lock(&module_mutex);
     /* Unlink carefully: kallsyms could be walking list. */
     list_del_rcu(&mod->list);
     mod_tree_remove(mod);
     /* 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_rcu();
     if (try_add_tainted_module(mod))
         pr_err("%s: adding tainted module to the unloaded tainted modules list failed.\n",
                mod->name);
     mutex_unlock(&module_mutex);
 
     /* Clean up CFI for the module. */
     cfi_cleanup(mod);
 
     /* This may be empty, but that's OK */
     module_arch_freeing_init(mod);
     module_memfree(mod->init_layout.base);
     kfree(mod->args);
     percpu_modfree(mod);
 
     /* Free lock-classes; relies on the preceding sync_rcu(). */
     lockdep_free_key_range(mod->data_layout.base, mod->data_layout.size);
 
     /* Finally, free the core (containing the module structure) */
     module_memfree(mod->core_layout.base);
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
     vfree(mod->data_layout.base);
 #endif
 }
 
 void *__symbol_get(const char *symbol)
 {
     struct find_symbol_arg fsa = {
         .name   = symbol,
         .gplok  = true,
         .warn   = true,
     };
 
     preempt_disable();
     if (!find_symbol(&fsa) || strong_try_module_get(fsa.owner)) {
         preempt_enable();
         return NULL;
     }
     preempt_enable();
     return (void *)kernel_symbol_value(fsa.sym);
 }
 EXPORT_SYMBOL_GPL(__symbol_get);
 
 /*
  * Ensure that an exported symbol [global namespace] does not already exist
  * in the kernel or in some other module's exported symbol table.
  *
  * You must hold the module_mutex.
  */
 static int verify_exported_symbols(struct module *mod)
 {
     unsigned int i;
     const struct kernel_symbol *s;
     struct {
         const struct kernel_symbol *sym;
         unsigned int num;
     } arr[] = {
         { mod->syms, mod->num_syms },
         { mod->gpl_syms, mod->num_gpl_syms },
     };
 
     for (i = 0; i < ARRAY_SIZE(arr); i++) {
         for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
             struct find_symbol_arg fsa = {
                 .name   = kernel_symbol_name(s),
                 .gplok  = true,
             };
             if (find_symbol(&fsa)) {
                 pr_err("%s: exports duplicate symbol %s"
                        " (owned by %s)\n",
                        mod->name, kernel_symbol_name(s),
                        module_name(fsa.owner));
                 return -ENOEXEC;
             }
         }
     }
     return 0;
 }
 
 static bool ignore_undef_symbol(Elf_Half emachine, const char *name)
 {
     /*
      * On x86, PIC code and Clang non-PIC code may have call foo@PLT. GNU as
      * before 2.37 produces an unreferenced _GLOBAL_OFFSET_TABLE_ on x86-64.
      * i386 has a similar problem but may not deserve a fix.
      *
      * If we ever have to ignore many symbols, consider refactoring the code to
      * only warn if referenced by a relocation.
      */
     if (emachine == EM_386 || emachine == EM_X86_64)
         return !strcmp(name, "_GLOBAL_OFFSET_TABLE_");
     return false;
 }
 
 /* Change all symbols so that st_value encodes the pointer directly. */
 static int simplify_symbols(struct module *mod, const struct load_info *info)
 {
     Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
     Elf_Sym *sym = (void *)symsec->sh_addr;
     unsigned long secbase;
     unsigned int i;
     int ret = 0;
     const struct kernel_symbol *ksym;
 
     for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
         const char *name = info->strtab + sym[i].st_name;
 
         switch (sym[i].st_shndx) {
         case SHN_COMMON:
             /* Ignore common symbols */
             if (!strncmp(name, "__gnu_lto", 9))
                 break;
 
             /*
              * We compiled with -fno-common.  These are not
              * supposed to happen.
              */
             pr_debug("Common symbol: %s\n", name);
             pr_warn("%s: please compile with -fno-common\n",
                    mod->name);
             ret = -ENOEXEC;
             break;
 
         case SHN_ABS:
             /* Don't need to do anything */
             pr_debug("Absolute symbol: 0x%08lx\n",
                    (long)sym[i].st_value);
             break;
 
         case SHN_LIVEPATCH:
             /* Livepatch symbols are resolved by livepatch */
             break;
 
         case SHN_UNDEF:
             ksym = resolve_symbol_wait(mod, info, name);
             /* Ok if resolved.  */
             if (ksym && !IS_ERR(ksym)) {
                 sym[i].st_value = kernel_symbol_value(ksym);
                 break;
             }
 
             /* Ok if weak or ignored.  */
             if (!ksym &&
                 (ELF_ST_BIND(sym[i].st_info) == STB_WEAK ||
                  ignore_undef_symbol(info->hdr->e_machine, name)))
                 break;
 
             ret = PTR_ERR(ksym) ?: -ENOENT;
             pr_warn("%s: Unknown symbol %s (err %d)\n",
                 mod->name, name, ret);
             break;
 
         default:
             /* Divert to percpu allocation if a percpu var. */
             if (sym[i].st_shndx == info->index.pcpu)
                 secbase = (unsigned long)mod_percpu(mod);
             else
                 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
             sym[i].st_value += secbase;
             break;
         }
     }
 
     return ret;
 }
 
 static int apply_relocations(struct module *mod, const struct load_info *info)
 {
     unsigned int i;
     int err = 0;
 
     /* Now do relocations. */
     for (i = 1; i < info->hdr->e_shnum; i++) {
         unsigned int infosec = info->sechdrs[i].sh_info;
 
         /* Not a valid relocation section? */
         if (infosec >= info->hdr->e_shnum)
             continue;
 
         /* Don't bother with non-allocated sections */
         if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
             continue;
 
         if (info->sechdrs[i].sh_flags & SHF_RELA_LIVEPATCH)
             err = klp_apply_section_relocs(mod, info->sechdrs,
                                info->secstrings,
                                info->strtab,
                                info->index.sym, i,
                                NULL);
         else if (info->sechdrs[i].sh_type == SHT_REL)
             err = apply_relocate(info->sechdrs, info->strtab,
                          info->index.sym, i, mod);
         else if (info->sechdrs[i].sh_type == SHT_RELA)
             err = apply_relocate_add(info->sechdrs, info->strtab,
                          info->index.sym, i, mod);
         if (err < 0)
             break;
     }
     return err;
 }
 
 /* Additional bytes needed by arch in front of individual sections */
 unsigned int __weak arch_mod_section_prepend(struct module *mod,
                          unsigned int section)
 {
     /* default implementation just returns zero */
     return 0;
 }
 
 /* Update size with this section: return offset. */
 long module_get_offset(struct module *mod, unsigned int *size,
                Elf_Shdr *sechdr, unsigned int section)
 {
     long ret;
 
     *size += arch_mod_section_prepend(mod, section);
     ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
     *size = ret + sechdr->sh_size;
     return ret;
 }
 
 static bool module_init_layout_section(const char *sname)
 {
 #ifndef CONFIG_MODULE_UNLOAD
     if (module_exit_section(sname))
         return true;
 #endif
     return module_init_section(sname);
 }
 
 /*
  * Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
  * might -- code, read-only data, read-write data, small data.  Tally
  * sizes, and place the offsets into sh_entsize fields: high bit means it
  * belongs in init.
  */
 static void layout_sections(struct module *mod, struct load_info *info)
 {
     static unsigned long const masks[][2] = {
         /*
          * NOTE: all executable code must be the first section
          * in this array; otherwise modify the text_size
          * finder in the two loops below
          */
         { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
         { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
         { SHF_RO_AFTER_INIT | SHF_ALLOC, ARCH_SHF_SMALL },
         { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
         { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
     };
     unsigned int m, i;
 
     for (i = 0; i < info->hdr->e_shnum; i++)
         info->sechdrs[i].sh_entsize = ~0UL;
 
     pr_debug("Core section allocation order:\n");
     for (m = 0; m < ARRAY_SIZE(masks); ++m) {
         for (i = 0; i < info->hdr->e_shnum; ++i) {
             Elf_Shdr *s = &info->sechdrs[i];
             const char *sname = info->secstrings + s->sh_name;
             unsigned int *sizep;
 
             if ((s->sh_flags & masks[m][0]) != masks[m][0]
                 || (s->sh_flags & masks[m][1])
                 || s->sh_entsize != ~0UL
                 || module_init_layout_section(sname))
                 continue;
             sizep = m ? &mod->data_layout.size : &mod->core_layout.size;
             s->sh_entsize = module_get_offset(mod, sizep, s, i);
             pr_debug("\t%s\n", sname);
         }
         switch (m) {
         case 0: /* executable */
             mod->core_layout.size = strict_align(mod->core_layout.size);
             mod->core_layout.text_size = mod->core_layout.size;
             break;
         case 1: /* RO: text and ro-data */
             mod->data_layout.size = strict_align(mod->data_layout.size);
             mod->data_layout.ro_size = mod->data_layout.size;
             break;
         case 2: /* RO after init */
             mod->data_layout.size = strict_align(mod->data_layout.size);
             mod->data_layout.ro_after_init_size = mod->data_layout.size;
             break;
         case 4: /* whole core */
             mod->data_layout.size = strict_align(mod->data_layout.size);
             break;
         }
     }
 
     pr_debug("Init section allocation order:\n");
     for (m = 0; m < ARRAY_SIZE(masks); ++m) {
         for (i = 0; i < info->hdr->e_shnum; ++i) {
             Elf_Shdr *s = &info->sechdrs[i];
             const char *sname = info->secstrings + s->sh_name;
 
             if ((s->sh_flags & masks[m][0]) != masks[m][0]
                 || (s->sh_flags & masks[m][1])
                 || s->sh_entsize != ~0UL
                 || !module_init_layout_section(sname))
                 continue;
             s->sh_entsize = (module_get_offset(mod, &mod->init_layout.size, s, i)
                      | INIT_OFFSET_MASK);
             pr_debug("\t%s\n", sname);
         }
         switch (m) {
         case 0: /* executable */
             mod->init_layout.size = strict_align(mod->init_layout.size);
             mod->init_layout.text_size = mod->init_layout.size;
             break;
         case 1: /* RO: text and ro-data */
             mod->init_layout.size = strict_align(mod->init_layout.size);
             mod->init_layout.ro_size = mod->init_layout.size;
             break;
         case 2:
             /*
              * RO after init doesn't apply to init_layout (only
              * core_layout), so it just takes the value of ro_size.
              */
             mod->init_layout.ro_after_init_size = mod->init_layout.ro_size;
             break;
         case 4: /* whole init */
             mod->init_layout.size = strict_align(mod->init_layout.size);
             break;
         }
     }
 }
 
 static void set_license(struct module *mod, const char *license)
 {
     if (!license)
         license = "unspecified";
 
     if (!license_is_gpl_compatible(license)) {
         if (!test_taint(TAINT_PROPRIETARY_MODULE))
             pr_warn("%s: module license '%s' taints kernel.\n",
                 mod->name, license);
         add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
                  LOCKDEP_NOW_UNRELIABLE);
     }
 }
 
 /* Parse tag=value strings from .modinfo section */
 static char *next_string(char *string, unsigned long *secsize)
 {
     /* Skip non-zero chars */
     while (string[0]) {
         string++;
         if ((*secsize)-- <= 1)
             return NULL;
     }
 
     /* Skip any zero padding. */
     while (!string[0]) {
         string++;
         if ((*secsize)-- <= 1)
             return NULL;
     }
     return string;
 }
 
 static char *get_next_modinfo(const struct load_info *info, const char *tag,
                   char *prev)
 {
     char *p;
     unsigned int taglen = strlen(tag);
     Elf_Shdr *infosec = &info->sechdrs[info->index.info];
     unsigned long size = infosec->sh_size;
 
     /*
      * get_modinfo() calls made before rewrite_section_headers()
      * must use sh_offset, as sh_addr isn't set!
      */
     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;
     int i;
 
     for (i = 0; (attr = modinfo_attrs[i]); i++) {
         if (attr->setup)
             attr->setup(mod, get_modinfo(info, attr->attr.name));
     }
 }
 
 static void free_modinfo(struct module *mod)
 {
     struct module_attribute *attr;
     int i;
 
     for (i = 0; (attr = modinfo_attrs[i]); i++) {
         if (attr->free)
             attr->free(mod);
     }
 }
 
 static void dynamic_debug_setup(struct module *mod, struct _ddebug *debug, unsigned int num)
 {
     if (!debug)
         return;
     ddebug_add_module(debug, num, mod->name);
 }
 
 static void dynamic_debug_remove(struct module *mod, struct _ddebug *debug)
 {
     if (debug)
         ddebug_remove_module(mod->name);
 }
 
 void * __weak module_alloc(unsigned long size)
 {
     return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
             GFP_KERNEL, PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS,
             NUMA_NO_NODE, __builtin_return_address(0));
 }
 
 bool __weak module_init_section(const char *name)
 {
     return strstarts(name, ".init");
 }
 
 bool __weak module_exit_section(const char *name)
 {
     return strstarts(name, ".exit");
 }
 
 static int validate_section_offset(struct load_info *info, Elf_Shdr *shdr)
 {
 #if defined(CONFIG_64BIT)
     unsigned long long secend;
 #else
     unsigned long secend;
 #endif
 
     /*
      * Check for both overflow and offset/size being
      * too large.
      */
     secend = shdr->sh_offset + shdr->sh_size;
     if (secend < shdr->sh_offset || secend > info->len)
         return -ENOEXEC;
 
     return 0;
 }
 
 /*
  * Sanity checks against invalid binaries, wrong arch, weird elf version.
  *
  * Also do basic validity checks against section offsets and sizes, the
  * section name string table, and the indices used for it (sh_name).
  */
 static int elf_validity_check(struct load_info *info)
 {
     unsigned int i;
     Elf_Shdr *shdr, *strhdr;
     int err;
 
     if (info->len < sizeof(*(info->hdr))) {
         pr_err("Invalid ELF header len %lu\n", info->len);
         goto no_exec;
     }
 
     if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0) {
         pr_err("Invalid ELF header magic: != %s\n", ELFMAG);
         goto no_exec;
     }
     if (info->hdr->e_type != ET_REL) {
         pr_err("Invalid ELF header type: %u != %u\n",
                info->hdr->e_type, ET_REL);
         goto no_exec;
     }
     if (!elf_check_arch(info->hdr)) {
         pr_err("Invalid architecture in ELF header: %u\n",
                info->hdr->e_machine);
         goto no_exec;
     }
     if (info->hdr->e_shentsize != sizeof(Elf_Shdr)) {
         pr_err("Invalid ELF section header size\n");
         goto no_exec;
     }
 
     /*
      * e_shnum is 16 bits, and sizeof(Elf_Shdr) is
      * known and small. So e_shnum * sizeof(Elf_Shdr)
      * will not overflow unsigned long on any platform.
      */
     if (info->hdr->e_shoff >= info->len
         || (info->hdr->e_shnum * sizeof(Elf_Shdr) >
         info->len - info->hdr->e_shoff)) {
         pr_err("Invalid ELF section header overflow\n");
         goto no_exec;
     }
 
     info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
 
     /*
      * Verify if the section name table index is valid.
      */
     if (info->hdr->e_shstrndx == SHN_UNDEF
         || info->hdr->e_shstrndx >= info->hdr->e_shnum) {
         pr_err("Invalid ELF section name index: %d || e_shstrndx (%d) >= e_shnum (%d)\n",
                info->hdr->e_shstrndx, info->hdr->e_shstrndx,
                info->hdr->e_shnum);
         goto no_exec;
     }
 
     strhdr = &info->sechdrs[info->hdr->e_shstrndx];
     err = validate_section_offset(info, strhdr);
     if (err < 0) {
         pr_err("Invalid ELF section hdr(type %u)\n", strhdr->sh_type);
         return err;
     }
 
     /*
      * The section name table must be NUL-terminated, as required
      * by the spec. This makes strcmp and pr_* calls that access
      * strings in the section safe.
      */
     info->secstrings = (void *)info->hdr + strhdr->sh_offset;
     if (strhdr->sh_size == 0) {
         pr_err("empty section name table\n");
         goto no_exec;
     }
     if (info->secstrings[strhdr->sh_size - 1] != '\0') {
         pr_err("ELF Spec violation: section name table isn't null terminated\n");
         goto no_exec;
     }
 
     /*
      * The code assumes that section 0 has a length of zero and
      * an addr of zero, so check for it.
      */
     if (info->sechdrs[0].sh_type != SHT_NULL
         || info->sechdrs[0].sh_size != 0
         || info->sechdrs[0].sh_addr != 0) {
         pr_err("ELF Spec violation: section 0 type(%d)!=SH_NULL or non-zero len or addr\n",
                info->sechdrs[0].sh_type);
         goto no_exec;
     }
 
     for (i = 1; i < info->hdr->e_shnum; i++) {
         shdr = &info->sechdrs[i];
         switch (shdr->sh_type) {
         case SHT_NULL:
         case SHT_NOBITS:
             continue;
         case SHT_SYMTAB:
             if (shdr->sh_link == SHN_UNDEF
                 || shdr->sh_link >= info->hdr->e_shnum) {
                 pr_err("Invalid ELF sh_link!=SHN_UNDEF(%d) or (sh_link(%d) >= hdr->e_shnum(%d)\n",
                        shdr->sh_link, shdr->sh_link,
                        info->hdr->e_shnum);
                 goto no_exec;
             }
             fallthrough;
         default:
             err = validate_section_offset(info, shdr);
             if (err < 0) {
                 pr_err("Invalid ELF section in module (section %u type %u)\n",
                     i, shdr->sh_type);
                 return err;
             }
 
             if (shdr->sh_flags & SHF_ALLOC) {
                 if (shdr->sh_name >= strhdr->sh_size) {
                     pr_err("Invalid ELF section name in module (section %u type %u)\n",
                            i, shdr->sh_type);
                     return -ENOEXEC;
                 }
             }
             break;
         }
     }
 
     return 0;
 
 no_exec:
     return -ENOEXEC;
 }
 
 #define COPY_CHUNK_SIZE (16*PAGE_SIZE)
 
 static int copy_chunked_from_user(void *dst, const void __user *usrc, unsigned long len)
 {
     do {
         unsigned long n = min(len, COPY_CHUNK_SIZE);
 
         if (copy_from_user(dst, usrc, n) != 0)
             return -EFAULT;
         cond_resched();
         dst += n;
         usrc += n;
         len -= n;
     } while (len);
     return 0;
 }
 
 static int check_modinfo_livepatch(struct module *mod, struct load_info *info)
 {
     if (!get_modinfo(info, "livepatch"))
         /* Nothing more to do */
         return 0;
 
     if (set_livepatch_module(mod)) {
         add_taint_module(mod, TAINT_LIVEPATCH, LOCKDEP_STILL_OK);
         pr_notice_once("%s: tainting kernel with TAINT_LIVEPATCH\n",
                 mod->name);
         return 0;
     }
 
     pr_err("%s: module is marked as livepatch module, but livepatch support is disabled",
            mod->name);
     return -ENOEXEC;
 }
 
 static void check_modinfo_retpoline(struct module *mod, struct load_info *info)
 {
     if (retpoline_module_ok(get_modinfo(info, "retpoline")))
         return;
 
     pr_warn("%s: loading module not compiled with retpoline compiler.\n",
         mod->name);
 }
 
 /* Sets info->hdr and info->len. */
 static int copy_module_from_user(const void __user *umod, unsigned long len,
                   struct load_info *info)
 {
     int err;
 
     info->len = len;
     if (info->len < sizeof(*(info->hdr)))
         return -ENOEXEC;
 
     err = security_kernel_load_data(LOADING_MODULE, true);
     if (err)
         return err;
 
     /* Suck in entire file: we'll want most of it. */
     info->hdr = __vmalloc(info->len, GFP_KERNEL | __GFP_NOWARN);
     if (!info->hdr)
         return -ENOMEM;
 
     if (copy_chunked_from_user(info->hdr, umod, info->len) != 0) {
         err = -EFAULT;
         goto out;
     }
 
     err = security_kernel_post_load_data((char *)info->hdr, info->len,
                          LOADING_MODULE, "init_module");
 out:
     if (err)
         vfree(info->hdr);
 
     return err;
 }
 
 static void free_copy(struct load_info *info, int flags)
 {
     if (flags & MODULE_INIT_COMPRESSED_FILE)
         module_decompress_cleanup(info);
     else
         vfree(info->hdr);
 }
 
 static int rewrite_section_headers(struct load_info *info, int flags)
 {
     unsigned int i;
 
     /* This should always be true, but let's be sure. */
     info->sechdrs[0].sh_addr = 0;
 
     for (i = 1; i < info->hdr->e_shnum; i++) {
         Elf_Shdr *shdr = &info->sechdrs[i];
 
         /*
          * Mark all sections sh_addr with their address in the
          * temporary image.
          */
         shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
 
     }
 
     /* Track but don't keep modinfo and version sections. */
     info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
     info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
 
     return 0;
 }
 
 /*
  * Set up our basic convenience variables (pointers to section headers,
  * search for module section index etc), and do some basic section
  * verification.
  *
  * Set info->mod to the temporary copy of the module in info->hdr. The final one
  * will be allocated in move_module().
  */
 static int setup_load_info(struct load_info *info, int flags)
 {
     unsigned int i;
 
     /* Try to find a name early so we can log errors with a module name */
     info->index.info = find_sec(info, ".modinfo");
     if (info->index.info)
         info->name = get_modinfo(info, "name");
 
     /* Find internal symbols and strings. */
     for (i = 1; i < info->hdr->e_shnum; i++) {
         if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
             info->index.sym = i;
             info->index.str = info->sechdrs[i].sh_link;
             info->strtab = (char *)info->hdr
                 + info->sechdrs[info->index.str].sh_offset;
             break;
         }
     }
 
     if (info->index.sym == 0) {
         pr_warn("%s: module has no symbols (stripped?)\n",
             info->name ?: "(missing .modinfo section or name field)");
         return -ENOEXEC;
     }
 
     info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
     if (!info->index.mod) {
         pr_warn("%s: No module found in object\n",
             info->name ?: "(missing .modinfo section or name field)");
         return -ENOEXEC;
     }
     /* This is temporary: point mod into copy of data. */
     info->mod = (void *)info->hdr + info->sechdrs[info->index.mod].sh_offset;
 
     /*
      * If we didn't load the .modinfo 'name' field earlier, fall back to
      * on-disk struct mod 'name' field.
      */
     if (!info->name)
         info->name = info->mod->name;
 
     if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
         info->index.vers = 0; /* Pretend no __versions section! */
     else
         info->index.vers = find_sec(info, "__versions");
 
     info->index.pcpu = find_pcpusec(info);
 
     return 0;
 }
 
 static int check_modinfo(struct module *mod, struct load_info *info, int flags)
 {
     const char *modmagic = get_modinfo(info, "vermagic");
     int err;
 
     if (flags & MODULE_INIT_IGNORE_VERMAGIC)
         modmagic = NULL;
 
     /* This is allowed: modprobe --force will invalidate it. */
     if (!modmagic) {
         err = try_to_force_load(mod, "bad vermagic");
         if (err)
             return err;
     } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
         pr_err("%s: version magic '%s' should be '%s'\n",
                info->name, modmagic, vermagic);
         return -ENOEXEC;
     }
 
     if (!get_modinfo(info, "intree")) {
         if (!test_taint(TAINT_OOT_MODULE))
             pr_warn("%s: loading out-of-tree module taints kernel.\n",
                 mod->name);
         add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
     }
 
     check_modinfo_retpoline(mod, info);
 
     if (get_modinfo(info, "staging")) {
         add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK);
         pr_warn("%s: module is from the staging directory, the quality "
             "is unknown, you have been warned.\n", mod->name);
     }
 
     err = check_modinfo_livepatch(mod, info);
     if (err)
         return err;
 
     /* Set up license info based on the info section */
     set_license(mod, get_modinfo(info, "license"));
 
     if (get_modinfo(info, "test")) {
         if (!test_taint(TAINT_TEST))
             pr_warn("%s: loading test module taints kernel.\n",
                 mod->name);
         add_taint_module(mod, TAINT_TEST, LOCKDEP_STILL_OK);
     }
 
     return 0;
 }
 
 static int find_module_sections(struct module *mod, struct load_info *info)
 {
     mod->kp = section_objs(info, "__param",
                    sizeof(*mod->kp), &mod->num_kp);
     mod->syms = section_objs(info, "__ksymtab",
                  sizeof(*mod->syms), &mod->num_syms);
     mod->crcs = section_addr(info, "__kcrctab");
     mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
                      sizeof(*mod->gpl_syms),
                      &mod->num_gpl_syms);
     mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
 
 #ifdef CONFIG_CONSTRUCTORS
     mod->ctors = section_objs(info, ".ctors",
                   sizeof(*mod->ctors), &mod->num_ctors);
     if (!mod->ctors)
         mod->ctors = section_objs(info, ".init_array",
                 sizeof(*mod->ctors), &mod->num_ctors);
     else if (find_sec(info, ".init_array")) {
         /*
          * This shouldn't happen with same compiler and binutils
          * building all parts of the module.
          */
         pr_warn("%s: has both .ctors and .init_array.\n",
                mod->name);
         return -EINVAL;
     }
 #endif
 
     mod->noinstr_text_start = section_objs(info, ".noinstr.text", 1,
                         &mod->noinstr_text_size);
 
 #ifdef CONFIG_TRACEPOINTS
     mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
                          sizeof(*mod->tracepoints_ptrs),
                          &mod->num_tracepoints);
 #endif
 #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_DEBUG_INFO_BTF_MODULES
     mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size);
 #endif
 #ifdef CONFIG_JUMP_LABEL
     mod->jump_entries = section_objs(info, "__jump_table",
                     sizeof(*mod->jump_entries),
                     &mod->num_jump_entries);
 #endif
 #ifdef CONFIG_EVENT_TRACING
     mod->trace_events = section_objs(info, "_ftrace_events",
                      sizeof(*mod->trace_events),
                      &mod->num_trace_events);
     mod->trace_evals = section_objs(info, "_ftrace_eval_map",
                     sizeof(*mod->trace_evals),
                     &mod->num_trace_evals);
 #endif
 #ifdef CONFIG_TRACING
     mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
                      sizeof(*mod->trace_bprintk_fmt_start),
                      &mod->num_trace_bprintk_fmt);
 #endif
 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
     /* sechdrs[0].sh_size is always zero */
     mod->ftrace_callsites = section_objs(info, FTRACE_CALLSITE_SECTION,
                          sizeof(*mod->ftrace_callsites),
                          &mod->num_ftrace_callsites);
 #endif
 #ifdef CONFIG_FUNCTION_ERROR_INJECTION
     mod->ei_funcs = section_objs(info, "_error_injection_whitelist",
                         sizeof(*mod->ei_funcs),
                         &mod->num_ei_funcs);
 #endif
 #ifdef CONFIG_KPROBES
     mod->kprobes_text_start = section_objs(info, ".kprobes.text", 1,
                         &mod->kprobes_text_size);
     mod->kprobe_blacklist = section_objs(info, "_kprobe_blacklist",
                         sizeof(unsigned long),
                         &mod->num_kprobe_blacklist);
 #endif
 #ifdef CONFIG_PRINTK_INDEX
     mod->printk_index_start = section_objs(info, ".printk_index",
                            sizeof(*mod->printk_index_start),
                            &mod->printk_index_size);
 #endif
 #ifdef CONFIG_HAVE_STATIC_CALL_INLINE
     mod->static_call_sites = section_objs(info, ".static_call_sites",
                           sizeof(*mod->static_call_sites),
                           &mod->num_static_call_sites);
 #endif
 #if IS_ENABLED(CONFIG_KUNIT)
     mod->kunit_suites = section_objs(info, ".kunit_test_suites",
                           sizeof(*mod->kunit_suites),
                           &mod->num_kunit_suites);
 #endif
 
     mod->extable = section_objs(info, "__ex_table",
                     sizeof(*mod->extable), &mod->num_exentries);
 
     if (section_addr(info, "__obsparm"))
         pr_warn("%s: Ignoring obsolete parameters\n", mod->name);
 
     info->debug = section_objs(info, "__dyndbg",
                    sizeof(*info->debug), &info->num_debug);
 
     return 0;
 }
 
 static int move_module(struct module *mod, struct load_info *info)
 {
     int i;
     void *ptr;
 
     /* Do the allocs. */
     ptr = module_alloc(mod->core_layout.size);
     /*
      * The pointer to this block is stored in the module structure
      * which is inside the block. Just mark it as not being a
      * leak.
      */
     kmemleak_not_leak(ptr);
     if (!ptr)
         return -ENOMEM;
 
     memset(ptr, 0, mod->core_layout.size);
     mod->core_layout.base = ptr;
 
     if (mod->init_layout.size) {
         ptr = module_alloc(mod->init_layout.size);
         /*
          * The pointer to this block is stored in the module structure
          * which is inside the block. This block doesn't need to be
          * scanned as it contains data and code that will be freed
          * after the module is initialized.
          */
         kmemleak_ignore(ptr);
         if (!ptr) {
             module_memfree(mod->core_layout.base);
             return -ENOMEM;
         }
         memset(ptr, 0, mod->init_layout.size);
         mod->init_layout.base = ptr;
     } else
         mod->init_layout.base = NULL;
 
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
     /* Do the allocs. */
     ptr = vzalloc(mod->data_layout.size);
     /*
      * The pointer to this block is stored in the module structure
      * which is inside the block. Just mark it as not being a
      * leak.
      */
     kmemleak_not_leak(ptr);
     if (!ptr) {
         module_memfree(mod->core_layout.base);
         module_memfree(mod->init_layout.base);
         return -ENOMEM;
     }
 
     mod->data_layout.base = ptr;
 #endif
     /* Transfer each section which specifies SHF_ALLOC */
     pr_debug("final section addresses:\n");
     for (i = 0; i < info->hdr->e_shnum; i++) {
         void *dest;
         Elf_Shdr *shdr = &info->sechdrs[i];
 
         if (!(shdr->sh_flags & SHF_ALLOC))
             continue;
 
         if (shdr->sh_entsize & INIT_OFFSET_MASK)
             dest = mod->init_layout.base
                 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
         else if (!(shdr->sh_flags & SHF_EXECINSTR))
             dest = mod->data_layout.base + shdr->sh_entsize;
         else
             dest = mod->core_layout.base + shdr->sh_entsize;
 
         if (shdr->sh_type != SHT_NOBITS)
             memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
         /* Update sh_addr to point to copy in image. */
         shdr->sh_addr = (unsigned long)dest;
         pr_debug("\t0x%lx %s\n",
              (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
     }
 
     return 0;
 }
 
 static int check_module_license_and_versions(struct module *mod)
 {
     int prev_taint = test_taint(TAINT_PROPRIETARY_MODULE);
 
     /*
      * ndiswrapper is under GPL by itself, but loads proprietary modules.
      * Don't use add_taint_module(), as it would prevent ndiswrapper from
      * using GPL-only symbols it needs.
      */
     if (strcmp(mod->name, "ndiswrapper") == 0)
         add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
 
     /* driverloader was caught wrongly pretending to be under GPL */
     if (strcmp(mod->name, "driverloader") == 0)
         add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
                  LOCKDEP_NOW_UNRELIABLE);
 
     /* lve claims to be GPL but upstream won't provide source */
     if (strcmp(mod->name, "lve") == 0)
         add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
                  LOCKDEP_NOW_UNRELIABLE);
 
     if (!prev_taint && test_taint(TAINT_PROPRIETARY_MODULE))
         pr_warn("%s: module license taints kernel.\n", mod->name);
 
 #ifdef CONFIG_MODVERSIONS
     if ((mod->num_syms && !mod->crcs) ||
         (mod->num_gpl_syms && !mod->gpl_crcs)) {
         return try_to_force_load(mod,
                      "no versions for exported symbols");
     }
 #endif
     return 0;
 }
 
 static void flush_module_icache(const struct module *mod)
 {
     /*
      * Flush the instruction cache, since we've played with text.
      * Do it before processing of module parameters, so the module
      * can provide parameter accessor functions of its own.
      */
     if (mod->init_layout.base)
         flush_icache_range((unsigned long)mod->init_layout.base,
                    (unsigned long)mod->init_layout.base
                    + mod->init_layout.size);
     flush_icache_range((unsigned long)mod->core_layout.base,
                (unsigned long)mod->core_layout.base + mod->core_layout.size);
 }
 
 int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
                      Elf_Shdr *sechdrs,
                      char *secstrings,
                      struct module *mod)
 {
     return 0;
 }
 
 /* module_blacklist is a comma-separated list of module names */
 static char *module_blacklist;
 static bool blacklisted(const char *module_name)
 {
     const char *p;
     size_t len;
 
     if (!module_blacklist)
         return false;
 
     for (p = module_blacklist; *p; p += len) {
         len = strcspn(p, ",");
         if (strlen(module_name) == len && !memcmp(module_name, p, len))
             return true;
         if (p[len] == ',')
             len++;
     }
     return false;
 }
 core_param(module_blacklist, module_blacklist, charp, 0400);
 
 static struct module *layout_and_allocate(struct load_info *info, int flags)
 {
     struct module *mod;
     unsigned int ndx;
     int err;
 
     err = check_modinfo(info->mod, info, flags);
     if (err)
         return ERR_PTR(err);
 
     /* Allow arches to frob section contents and sizes.  */
     err = module_frob_arch_sections(info->hdr, info->sechdrs,
                     info->secstrings, info->mod);
     if (err < 0)
         return ERR_PTR(err);
 
     err = module_enforce_rwx_sections(info->hdr, info->sechdrs,
                       info->secstrings, info->mod);
     if (err < 0)
         return ERR_PTR(err);
 
     /* We will do a special allocation for per-cpu sections later. */
     info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
 
     /*
      * Mark ro_after_init section with SHF_RO_AFTER_INIT so that
      * layout_sections() can put it in the right place.
      * Note: ro_after_init sections also have SHF_{WRITE,ALLOC} set.
      */
     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
      * special cases for the architectures.
      */
     layout_sections(info->mod, info);
     layout_symtab(info->mod, info);
 
     /* Allocate and move to the final place */
     err = move_module(info->mod, info);
     if (err)
         return ERR_PTR(err);
 
     /* Module has been copied to its final place now: return it. */
     mod = (void *)info->sechdrs[info->index.mod].sh_addr;
     kmemleak_load_module(mod, info);
     return mod;
 }
 
 /* mod is no longer valid after this! */
 static void module_deallocate(struct module *mod, struct load_info *info)
 {
     percpu_modfree(mod);
     module_arch_freeing_init(mod);
     module_memfree(mod->init_layout.base);
     module_memfree(mod->core_layout.base);
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
     vfree(mod->data_layout.base);
 #endif
 }
 
 int __weak module_finalize(const Elf_Ehdr *hdr,
                const Elf_Shdr *sechdrs,
                struct module *me)
 {
     return 0;
 }
 
 static int post_relocation(struct module *mod, const struct load_info *info)
 {
     /* Sort exception table now relocations are done. */
     sort_extable(mod->extable, mod->extable + mod->num_exentries);
 
     /* Copy relocated percpu area over. */
     percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
                info->sechdrs[info->index.pcpu].sh_size);
 
     /* Setup kallsyms-specific fields. */
     add_kallsyms(mod, info);
 
     /* Arch-specific module finalizing. */
     return module_finalize(info->hdr, info->sechdrs, mod);
 }
 
 /* Is this module of this name done loading?  No locks held. */
 static bool finished_loading(const char *name)
 {
     struct module *mod;
     bool ret;
 
     /*
      * The module_mutex should not be a heavily contended lock;
      * if we get the occasional sleep here, we'll go an extra iteration
      * in the wait_event_interruptible(), which is harmless.
      */
     sched_annotate_sleep();
     mutex_lock(&module_mutex);
     mod = find_module_all(name, strlen(name), true);
     ret = !mod || mod->state == MODULE_STATE_LIVE;
     mutex_unlock(&module_mutex);
 
     return ret;
 }
 
 /* Call module constructors. */
 static void do_mod_ctors(struct module *mod)
 {
 #ifdef CONFIG_CONSTRUCTORS
     unsigned long i;
 
     for (i = 0; i < mod->num_ctors; i++)
         mod->ctors[i]();
 #endif
 }
 
 /* For freeing module_init on success, in case kallsyms traversing */
 struct mod_initfree {
     struct llist_node node;
     void *module_init;
 };
 
 static void do_free_init(struct work_struct *w)
 {
     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);
     }
 }
 
 #undef MODULE_PARAM_PREFIX
 #define MODULE_PARAM_PREFIX "module."
 /* Default value for module->async_probe_requested */
 static bool async_probe;
 module_param(async_probe, bool, 0644);
 
 /*
  * This is where the real work happens.
  *
  * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
  * helper command 'lx-symbols'.
  */
 static noinline int do_init_module(struct module *mod)
 {
     int ret = 0;
     struct mod_initfree *freeinit;
 
     freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL);
     if (!freeinit) {
         ret = -ENOMEM;
         goto fail;
     }
     freeinit->module_init = mod->init_layout.base;
 
     do_mod_ctors(mod);
     /* Start the module */
     if (mod->init != NULL)
         ret = do_one_initcall(mod->init);
     if (ret < 0) {
         goto fail_free_freeinit;
     }
     if (ret > 0) {
         pr_warn("%s: '%s'->init suspiciously returned %d, it should "
             "follow 0/-E convention\n"
             "%s: loading module anyway...\n",
             __func__, mod->name, ret, __func__);
         dump_stack();
     }
 
     /* Now it's a first class citizen! */
     mod->state = MODULE_STATE_LIVE;
     blocking_notifier_call_chain(&module_notify_list,
                      MODULE_STATE_LIVE, mod);
 
     /* Delay uevent until module has finished its init routine */
     kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
 
     /*
      * We need to finish all async code before the module init sequence
      * is done. This has potential to deadlock if synchronous module
      * loading is requested from async (which is not allowed!).
      *
      * See commit 0fdff3ec6d87 ("async, kmod: warn on synchronous
      * request_module() from async workers") for more details.
      */
     if (!mod->async_probe_requested)
         async_synchronize_full();
 
     ftrace_free_mem(mod, mod->init_layout.base, mod->init_layout.base +
             mod->init_layout.size);
     mutex_lock(&module_mutex);
     /* Drop initial reference. */
     module_put(mod);
     trim_init_extable(mod);
 #ifdef CONFIG_KALLSYMS
     /* Switch to core kallsyms now init is done: kallsyms may be walking! */
     rcu_assign_pointer(mod->kallsyms, &mod->core_kallsyms);
 #endif
     module_enable_ro(mod, true);
     mod_tree_remove_init(mod);
     module_arch_freeing_init(mod);
     mod->init_layout.base = NULL;
     mod->init_layout.size = 0;
     mod->init_layout.ro_size = 0;
     mod->init_layout.ro_after_init_size = 0;
     mod->init_layout.text_size = 0;
 #ifdef CONFIG_DEBUG_INFO_BTF_MODULES
     /* .BTF is not SHF_ALLOC and will get removed, so sanitize pointer */
     mod->btf_data = NULL;
 #endif
     /*
      * 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_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()
      */
     if (llist_add(&freeinit->node, &init_free_list))
         schedule_work(&init_free_wq);
 
     mutex_unlock(&module_mutex);
     wake_up_all(&module_wq);
 
     return 0;
 
 fail_free_freeinit:
     kfree(freeinit);
 fail:
     /* Try to protect us from buggy refcounters. */
     mod->state = MODULE_STATE_GOING;
     synchronize_rcu();
     module_put(mod);
     blocking_notifier_call_chain(&module_notify_list,
                      MODULE_STATE_GOING, mod);
     klp_module_going(mod);
     ftrace_release_mod(mod);
     free_module(mod);
     wake_up_all(&module_wq);
     return ret;
 }
 
 static int may_init_module(void)
 {
     if (!capable(CAP_SYS_MODULE) || modules_disabled)
         return -EPERM;
 
     return 0;
 }
 
 /*
  * We try to place it in the list now to make sure it's unique before
  * we dedicate too many resources.  In particular, temporary percpu
  * memory exhaustion.
  */
 static int add_unformed_module(struct module *mod)
 {
     int err;
     struct module *old;
 
     mod->state = MODULE_STATE_UNFORMED;
 
 again:
     mutex_lock(&module_mutex);
     old = find_module_all(mod->name, strlen(mod->name), true);
     if (old != NULL) {
         if (old->state != MODULE_STATE_LIVE) {
             /* Wait in case it fails to load. */
             mutex_unlock(&module_mutex);
             err = wait_event_interruptible(module_wq,
                            finished_loading(mod->name));
             if (err)
                 goto out_unlocked;
             goto again;
         }
         err = -EEXIST;
         goto out;
     }
     mod_update_bounds(mod);
     list_add_rcu(&mod->list, &modules);
     mod_tree_insert(mod);
     err = 0;
 
 out:
     mutex_unlock(&module_mutex);
 out_unlocked:
     return err;
 }
 
 static int complete_formation(struct module *mod, struct load_info *info)
 {
     int err;
 
     mutex_lock(&module_mutex);
 
     /* Find duplicate symbols (must be called under lock). */
     err = verify_exported_symbols(mod);
     if (err < 0)
         goto out;
 
     /* This relies on module_mutex for list integrity. */
     module_bug_finalize(info->hdr, info->sechdrs, mod);
 
     if (module_check_misalignment(mod))
         goto out_misaligned;
 
     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.
      */
     mod->state = MODULE_STATE_COMING;
     mutex_unlock(&module_mutex);
 
     return 0;
 
 out_misaligned:
     err = -EINVAL;
 out:
     mutex_unlock(&module_mutex);
     return err;
 }
 
 static int prepare_coming_module(struct module *mod)
 {
     int err;
 
     ftrace_module_enable(mod);
     err = klp_module_coming(mod);
     if (err)
         return err;
 
     err = blocking_notifier_call_chain_robust(&module_notify_list,
             MODULE_STATE_COMING, MODULE_STATE_GOING, mod);
     err = notifier_to_errno(err);
     if (err)
         klp_module_going(mod);
 
     return err;
 }
 
 static int unknown_module_param_cb(char *param, char *val, const char *modname,
                    void *arg)
 {
     struct module *mod = arg;
     int ret;
 
     if (strcmp(param, "async_probe") == 0) {
         if (strtobool(val, &mod->async_probe_requested))
             mod->async_probe_requested = true;
         return 0;
     }
 
     /* Check for magic 'dyndbg' arg */
     ret = ddebug_dyndbg_module_param_cb(param, val, modname);
     if (ret != 0)
         pr_warn("%s: unknown parameter '%s' ignored\n", modname, param);
     return 0;
 }
 
 static void cfi_init(struct module *mod);
 
 /*
  * Allocate and load the module: note that size of section 0 is always
  * zero, and we rely on this for optional sections.
  */
 static int load_module(struct load_info *info, const char __user *uargs,
                int flags)
 {
     struct module *mod;
     long err = 0;
     char *after_dashes;
 
     /*
      * Do the signature check (if any) first. All that
      * the signature check needs is info->len, it does
      * not need any of the section info. That can be
      * set up later. This will minimize the chances
      * of a corrupt module causing problems before
      * we even get to the signature check.
      *
      * The check will also adjust info->len by stripping
      * off the sig length at the end of the module, making
      * checks against info->len more correct.
      */
     err = module_sig_check(info, flags);
     if (err)
         goto free_copy;
 
     /*
      * Do basic sanity checks against the ELF header and
      * sections.
      */
     err = elf_validity_check(info);
     if (err)
         goto free_copy;
 
     /*
      * Everything checks out, so set up the section info
      * in the info structure.
      */
     err = setup_load_info(info, flags);
     if (err)
         goto free_copy;
 
     /*
      * Now that we know we have the correct module name, check
      * if it's blacklisted.
      */
     if (blacklisted(info->name)) {
         err = -EPERM;
         pr_err("Module %s is blacklisted\n", info->name);
         goto free_copy;
     }
 
     err = rewrite_section_headers(info, flags);
     if (err)
         goto free_copy;
 
     /* Check module struct version now, before we try to use module. */
     if (!check_modstruct_version(info, info->mod)) {
         err = -ENOEXEC;
         goto free_copy;
     }
 
     /* Figure out module layout, and allocate all the memory. */
     mod = layout_and_allocate(info, flags);
     if (IS_ERR(mod)) {
         err = PTR_ERR(mod);
         goto free_copy;
     }
 
     audit_log_kern_module(mod->name);
 
     /* Reserve our place in the list. */
     err = add_unformed_module(mod);
     if (err)
         goto free_module;
 
 #ifdef CONFIG_MODULE_SIG
     mod->sig_ok = info->sig_ok;
     if (!mod->sig_ok) {
         pr_notice_once("%s: module verification failed: signature "
                    "and/or required key missing - tainting "
                    "kernel\n", mod->name);
         add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
     }
 #endif
 
     /* To avoid stressing percpu allocator, do this once we're unique. */
     err = percpu_modalloc(mod, info);
     if (err)
         goto unlink_mod;
 
     /* Now module is in final location, initialize linked lists, etc. */
     err = module_unload_init(mod);
     if (err)
         goto unlink_mod;
 
     init_param_lock(mod);
 
     /*
      * Now we've got everything in the final locations, we can
      * find optional sections.
      */
     err = find_module_sections(mod, info);
     if (err)
         goto free_unload;
 
     err = check_module_license_and_versions(mod);
     if (err)
         goto free_unload;
 
     /* Set up MODINFO_ATTR fields */
     setup_modinfo(mod, info);
 
     /* Fix up syms, so that st_value is a pointer to location. */
     err = simplify_symbols(mod, info);
     if (err < 0)
         goto free_modinfo;
 
     err = apply_relocations(mod, info);
     if (err < 0)
         goto free_modinfo;
 
     err = post_relocation(mod, info);
     if (err < 0)
         goto free_modinfo;
 
     flush_module_icache(mod);
 
     /* Setup CFI for the module. */
     cfi_init(mod);
 
     /* Now copy in args */
     mod->args = strndup_user(uargs, ~0UL >> 1);
     if (IS_ERR(mod->args)) {
         err = PTR_ERR(mod->args);
         goto free_arch_cleanup;
     }
 
     init_build_id(mod, info);
     dynamic_debug_setup(mod, info->debug, info->num_debug);
 
     /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
     ftrace_module_init(mod);
 
     /* Finally it's fully formed, ready to start executing. */
     err = complete_formation(mod, info);
     if (err)
         goto ddebug_cleanup;
 
     err = prepare_coming_module(mod);
     if (err)
         goto bug_cleanup;
 
     mod->async_probe_requested = async_probe;
 
     /* Module is ready to execute: parsing args may do that. */
     after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
                   -32768, 32767, mod,
                   unknown_module_param_cb);
     if (IS_ERR(after_dashes)) {
         err = PTR_ERR(after_dashes);
         goto coming_cleanup;
     } else if (after_dashes) {
         pr_warn("%s: parameters '%s' after `--' ignored\n",
                mod->name, after_dashes);
     }
 
     /* Link in to sysfs. */
     err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
     if (err < 0)
         goto coming_cleanup;
 
     if (is_livepatch_module(mod)) {
         err = copy_module_elf(mod, info);
         if (err < 0)
             goto sysfs_cleanup;
     }
 
     /* Get rid of temporary copy. */
     free_copy(info, flags);
 
     /* Done! */
     trace_module_load(mod);
 
     return do_init_module(mod);
 
  sysfs_cleanup:
     mod_sysfs_teardown(mod);
  coming_cleanup:
     mod->state = MODULE_STATE_GOING;
     destroy_params(mod->kp, mod->num_kp);
     blocking_notifier_call_chain(&module_notify_list,
                      MODULE_STATE_GOING, mod);
     klp_module_going(mod);
  bug_cleanup:
     mod->state = MODULE_STATE_GOING;
     /* module_bug_cleanup needs module_mutex protection */
     mutex_lock(&module_mutex);
     module_bug_cleanup(mod);
     mutex_unlock(&module_mutex);
 
  ddebug_cleanup:
     ftrace_release_mod(mod);
     dynamic_debug_remove(mod, info->debug);
     synchronize_rcu();
     kfree(mod->args);
  free_arch_cleanup:
     cfi_cleanup(mod);
     module_arch_cleanup(mod);
  free_modinfo:
     free_modinfo(mod);
  free_unload:
     module_unload_free(mod);
  unlink_mod:
     mutex_lock(&module_mutex);
     /* Unlink carefully: kallsyms could be walking list. */
     list_del_rcu(&mod->list);
     mod_tree_remove(mod);
     wake_up_all(&module_wq);
     /* Wait for RCU-sched synchronizing before releasing mod->list. */
     synchronize_rcu();
     mutex_unlock(&module_mutex);
  free_module:
     /* Free lock-classes; relies on the preceding sync_rcu() */
     lockdep_free_key_range(mod->data_layout.base, mod->data_layout.size);
 
     module_deallocate(mod, info);
  free_copy:
     free_copy(info, flags);
     return err;
 }
 
 SYSCALL_DEFINE3(init_module, void __user *, umod,
         unsigned long, len, const char __user *, uargs)
 {
     int err;
     struct load_info info = { };
 
     err = may_init_module();
     if (err)
         return err;
 
     pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
            umod, len, uargs);
 
     err = copy_module_from_user(umod, len, &info);
     if (err)
         return err;
 
     return load_module(&info, uargs, 0);
 }
 
 SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
 {
     struct load_info info = { };
     void *buf = NULL;
     int len;
     int err;
 
     err = may_init_module();
     if (err)
         return err;
 
     pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
 
     if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
               |MODULE_INIT_IGNORE_VERMAGIC
               |MODULE_INIT_COMPRESSED_FILE))
         return -EINVAL;
 
     len = kernel_read_file_from_fd(fd, 0, &buf, INT_MAX, NULL,
                        READING_MODULE);
     if (len < 0)
         return len;
 
     if (flags & MODULE_INIT_COMPRESSED_FILE) {
         err = module_decompress(&info, buf, len);
         vfree(buf); /* compressed data is no longer needed */
         if (err)
             return err;
     } else {
         info.hdr = buf;
         info.len = len;
     }
 
     return load_module(&info, uargs, flags);
 }
 
 static inline int within(unsigned long addr, void *start, unsigned long size)
 {
     return ((void *)addr >= start && (void *)addr < start + size);
 }
 
 static void cfi_init(struct module *mod)
 {
 #ifdef CONFIG_CFI_CLANG
     initcall_t *init;
 #ifdef CONFIG_MODULE_UNLOAD
     exitcall_t *exit;
 #endif
 
     rcu_read_lock_sched();
     mod->cfi_check = (cfi_check_fn)
         find_kallsyms_symbol_value(mod, "__cfi_check");
     init = (initcall_t *)
         find_kallsyms_symbol_value(mod, "__cfi_jt_init_module");
     /* Fix init/exit functions to point to the CFI jump table */
     if (init)
         mod->init = *init;
 #ifdef CONFIG_MODULE_UNLOAD
     exit = (exitcall_t *)
         find_kallsyms_symbol_value(mod, "__cfi_jt_cleanup_module");
     if (exit)
         mod->exit = *exit;
 #endif
     rcu_read_unlock_sched();
 
     cfi_module_add(mod, mod_tree.addr_min);
 #endif
 }
 
 static void cfi_cleanup(struct module *mod)
 {
 #ifdef CONFIG_CFI_CLANG
     cfi_module_remove(mod, mod_tree.addr_min);
 #endif
 }
 
 /* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */
 char *module_flags(struct module *mod, char *buf, bool show_state)
 {
     int bx = 0;
 
     BUG_ON(mod->state == MODULE_STATE_UNFORMED);
     if (!mod->taints && !show_state)
         goto out;
     if (mod->taints ||
         mod->state == MODULE_STATE_GOING ||
         mod->state == MODULE_STATE_COMING) {
         buf[bx++] = '(';
         bx += module_flags_taint(mod->taints, buf + bx);
         /* Show a - for module-is-being-unloaded */
         if (mod->state == MODULE_STATE_GOING && show_state)
             buf[bx++] = '-';
         /* Show a + for module-is-being-loaded */
         if (mod->state == MODULE_STATE_COMING && show_state)
             buf[bx++] = '+';
         buf[bx++] = ')';
     }
 out:
     buf[bx] = '\0';
 
     return buf;
 }
 
 /* Given an address, look for it in the module exception tables. */
 const struct exception_table_entry *search_module_extables(unsigned long addr)
 {
     const struct exception_table_entry *e = NULL;
     struct module *mod;
 
     preempt_disable();
     mod = __module_address(addr);
     if (!mod)
         goto out;
 
     if (!mod->num_exentries)
         goto out;
 
     e = search_extable(mod->extable,
                mod->num_exentries,
                addr);
 out:
     preempt_enable();
 
     /*
      * Now, if we found one, we are running inside it now, hence
      * we cannot unload the module, hence no refcnt needed.
      */
     return e;
 }
 
 /**
  * is_module_address() - is this address inside a module?
  * @addr: the address to check.
  *
  * See is_module_text_address() if you simply want to see if the address
  * is code (not data).
  */
 bool is_module_address(unsigned long addr)
 {
     bool ret;
 
     preempt_disable();
     ret = __module_address(addr) != NULL;
     preempt_enable();
 
     return ret;
 }
 
 /**
  * __module_address() - get the module which contains an address.
  * @addr: the address.
  *
  * Must be called with preempt disabled or module mutex held so that
  * module doesn't get freed during this.
  */
 struct module *__module_address(unsigned long addr)
 {
     struct module *mod;
     struct mod_tree_root *tree;
 
     if (addr >= mod_tree.addr_min && addr <= mod_tree.addr_max)
         tree = &mod_tree;
 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
     else if (addr >= mod_data_tree.addr_min && addr <= mod_data_tree.addr_max)
         tree = &mod_data_tree;
 #endif
     else
         return NULL;
 
     module_assert_mutex_or_preempt();
 
     mod = mod_find(addr, tree);
     if (mod) {
         BUG_ON(!within_module(addr, mod));
         if (mod->state == MODULE_STATE_UNFORMED)
             mod = NULL;
     }
     return mod;
 }
 
 /**
  * is_module_text_address() - is this address inside module code?
  * @addr: the address to check.
  *
  * See is_module_address() if you simply want to see if the address is
  * anywhere in a module.  See kernel_text_address() for testing if an
  * address corresponds to kernel or module code.
  */
 bool is_module_text_address(unsigned long addr)
 {
     bool ret;
 
     preempt_disable();
     ret = __module_text_address(addr) != NULL;
     preempt_enable();
 
     return ret;
 }
 
 /**
  * __module_text_address() - get the module whose code contains an address.
  * @addr: the address.
  *
  * Must be called with preempt disabled or module mutex held so that
  * module doesn't get freed during this.
  */
 struct module *__module_text_address(unsigned long addr)
 {
     struct module *mod = __module_address(addr);
     if (mod) {
         /* Make sure it's within the text section. */
         if (!within(addr, mod->init_layout.base, mod->init_layout.text_size)
             && !within(addr, mod->core_layout.base, mod->core_layout.text_size))
             mod = NULL;
     }
     return mod;
 }
 
 /* Don't grab lock, we're oopsing. */
 void print_modules(void)
 {
     struct module *mod;
     char buf[MODULE_FLAGS_BUF_SIZE];
 
     printk(KERN_DEFAULT "Modules linked in:");
     /* Most callers should already have preempt disabled, but make sure */
     preempt_disable();
     list_for_each_entry_rcu(mod, &modules, list) {
         if (mod->state == MODULE_STATE_UNFORMED)
             continue;
         pr_cont(" %s%s", mod->name, module_flags(mod, buf, true));
     }
 
     print_unloaded_tainted_modules();
     preempt_enable();
     if (last_unloaded_module.name[0])
         pr_cont(" [last unloaded: %s%s]", last_unloaded_module.name,
             last_unloaded_module.taints);
     pr_cont("\n");
 }