Quelle params.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Helpers for initial module or kernel cmdline parsing
* Copyright (C) 2001 Rusty Russell.
*/
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kstrtox.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/overflow.h>
#include <linux/security.h>
#include <linux/slab.h>
#include <linux/string.h>

#ifdef CONFIG_SYSFS
/* Protects all built-in parameters, modules use their own param_lock */
static DEFINE_MUTEX(param_lock);

/* Use the module's mutex, or if built-in use the built-in mutex */
#ifdef CONFIG_MODULES
#define KPARAM_MUTEX(mod) ((mod) ? &(mod)->param_lock : ¶m_lock)
#else
#define KPARAM_MUTEX(mod) (¶m_lock)
#endif

static inline void check_kparam_locked(struct module *mod)
{
BUG_ON(!mutex_is_locked(KPARAM_MUTEX(mod)));
}
#else
static inline void check_kparam_locked(struct module *mod)
{
}
#endif /* !CONFIG_SYSFS */

/* This just allows us to keep track of which parameters are kmalloced. */
struct kmalloced_param {
struct list_head list;
char val[];
};
static LIST_HEAD(kmalloced_params);
static DEFINE_SPINLOCK(kmalloced_params_lock);

static void *kmalloc_parameter(unsigned int size)
{
struct kmalloced_param *p;

p = kmalloc(size_add(sizeof(*p), size), GFP_KERNEL);
if (!p)
  return NULL;

spin_lock(&kmalloced_params_lock);
list_add(&p->list, &kmalloced_params);
spin_unlock(&kmalloced_params_lock);

return p->val;
}

/* Does nothing if parameter wasn't kmalloced above. */
static void maybe_kfree_parameter(void *param)
{
struct kmalloced_param *p;

spin_lock(&kmalloced_params_lock);
list_for_each_entry(p, &kmalloced_params, list) {
  if (p->val == param) {
   list_del(&p->list);
   kfree(p);
   break;
  }
}
spin_unlock(&kmalloced_params_lock);
}

static char dash2underscore(char c)
{
if (c == '-')
  return '_';
return c;
}

bool parameqn(const char *a, const char *b, size_t n)
{
size_t i;

for (i = 0; i < n; i++) {
  if (dash2underscore(a[i]) != dash2underscore(b[i]))
   return false;
}
return true;
}

bool parameq(const char *a, const char *b)
{
return parameqn(a, b, strlen(a)+1);
}

static bool param_check_unsafe(const struct kernel_param *kp)
{
if (kp->flags & KERNEL_PARAM_FL_HWPARAM &&
     security_locked_down(LOCKDOWN_MODULE_PARAMETERS))
  return false;

if (kp->flags & KERNEL_PARAM_FL_UNSAFE) {
  pr_notice("Setting dangerous option %s - tainting kernel\n",
     kp->name);
  add_taint(TAINT_USER, LOCKDEP_STILL_OK);
}

return true;
}

static int parse_one(char *param,
       char *val,
       const char *doing,
       const struct kernel_param *params,
       unsigned num_params,
       s16 min_level,
       s16 max_level,
       void *arg, parse_unknown_fn handle_unknown)
{
unsigned int i;
int err;

/* Find parameter */
for (i = 0; i < num_params; i++) {
  if (parameq(param, params[i].name)) {
   if (params[i].level < min_level
       || params[i].level > max_level)
    return 0;
   /* No one handled NULL, so do it here. */
   if (!val &&
       !(params[i].ops->flags & KERNEL_PARAM_OPS_FL_NOARG))
    return -EINVAL;
   pr_debug("handling %s with %p\n", param,
    params[i].ops->set);
   kernel_param_lock(params[i].mod);
   if (param_check_unsafe(¶ms[i]))
    err = params[i].ops->set(val, ¶ms[i]);
   else
    err = -EPERM;
   kernel_param_unlock(params[i].mod);
   return err;
  }
}

if (handle_unknown) {
  pr_debug("doing %s: %s='%s'\n", doing, param, val);
  return handle_unknown(param, val, doing, arg);
}

pr_debug("Unknown argument '%s'\n", param);
return -ENOENT;
}

/* Args looks like "foo=bar,bar2 baz=fuz wiz". */
char *parse_args(const char *doing,
   char *args,
   const struct kernel_param *params,
   unsigned num,
   s16 min_level,
   s16 max_level,
   void *arg, parse_unknown_fn unknown)
{
char *param, *val, *err = NULL;

/* Chew leading spaces */
args = skip_spaces(args);

if (*args)
  pr_debug("doing %s, parsing ARGS: '%s'\n", doing, args);

while (*args) {
  int ret;
  int irq_was_disabled;

  args = next_arg(args, ¶m, &val);
  /* Stop at -- */
  if (!val && strcmp(param, "--") == 0)
   return err ?: args;
  irq_was_disabled = irqs_disabled();
  ret = parse_one(param, val, doing, params, num,
    min_level, max_level, arg, unknown);
  if (irq_was_disabled && !irqs_disabled())
   pr_warn("%s: option '%s' enabled irq's!\n",
    doing, param);

  switch (ret) {
  case 0:
   continue;
  case -ENOENT:
   pr_err("%s: Unknown parameter `%s'\n", doing, param);
   break;
  case -ENOSPC:
   pr_err("%s: `%s' too large for parameter `%s'\n",
          doing, val ?: "", param);
   break;
  default:
   pr_err("%s: `%s' invalid for parameter `%s'\n",
          doing, val ?: "", param);
   break;
  }

  err = ERR_PTR(ret);
}

return err;
}

/* Lazy bastard, eh? */
#define STANDARD_PARAM_DEF(name, type, format, strtolfn)        \
int param_set_##name(const char *val, const struct kernel_param *kp) \
{        \
  return strtolfn(val, 0, (type *)kp->arg);  \
}        \
int param_get_##name(char *buffer, const struct kernel_param *kp) \
{        \
  return scnprintf(buffer, PAGE_SIZE, format "\n", \
    *((type *)kp->arg));   \
}        \
const struct kernel_param_ops param_ops_##name = {   \
  .set = param_set_##name,    \
  .get = param_get_##name,    \
};        \
EXPORT_SYMBOL(param_set_##name);    \
EXPORT_SYMBOL(param_get_##name);    \
EXPORT_SYMBOL(param_ops_##name)

STANDARD_PARAM_DEF(byte, unsigned char,  "%hhu",  kstrtou8);
STANDARD_PARAM_DEF(short, short,   "%hi",  kstrtos16);
STANDARD_PARAM_DEF(ushort, unsigned short,  "%hu",  kstrtou16);
STANDARD_PARAM_DEF(int,  int,   "%i",  kstrtoint);
STANDARD_PARAM_DEF(uint, unsigned int,  "%u",  kstrtouint);
STANDARD_PARAM_DEF(long, long,   "%li",  kstrtol);
STANDARD_PARAM_DEF(ulong, unsigned long,  "%lu",  kstrtoul);
STANDARD_PARAM_DEF(ullong, unsigned long long, "%llu",  kstrtoull);
STANDARD_PARAM_DEF(hexint, unsigned int,  "%#08x",  kstrtouint);

int param_set_uint_minmax(const char *val, const struct kernel_param *kp,
  unsigned int min, unsigned int max)
{
unsigned int num;
int ret;

if (!val)
  return -EINVAL;
ret = kstrtouint(val, 0, &num);
if (ret)
  return ret;
if (num < min || num > max)
  return -EINVAL;
*((unsigned int *)kp->arg) = num;
return 0;
}
EXPORT_SYMBOL_GPL(param_set_uint_minmax);

int param_set_charp(const char *val, const struct kernel_param *kp)
{
size_t len, maxlen = 1024;

len = strnlen(val, maxlen + 1);
if (len == maxlen + 1) {
  pr_err("%s: string parameter too long\n", kp->name);
  return -ENOSPC;
}

maybe_kfree_parameter(*(char **)kp->arg);

/*
* This is a hack. We can't kmalloc() in early boot, and we
* don't need to; this mangled commandline is preserved.
*/
if (slab_is_available()) {
  *(char **)kp->arg = kmalloc_parameter(len + 1);
  if (!*(char **)kp->arg)
   return -ENOMEM;
  strcpy(*(char **)kp->arg, val);
} else
  *(const char **)kp->arg = val;

return 0;
}
EXPORT_SYMBOL(param_set_charp);

int param_get_charp(char *buffer, const struct kernel_param *kp)
{
return scnprintf(buffer, PAGE_SIZE, "%s\n", *((char **)kp->arg));
}
EXPORT_SYMBOL(param_get_charp);

void param_free_charp(void *arg)
{
maybe_kfree_parameter(*((char **)arg));
}
EXPORT_SYMBOL(param_free_charp);

const struct kernel_param_ops param_ops_charp = {
.set = param_set_charp,
.get = param_get_charp,
.free = param_free_charp,
};
EXPORT_SYMBOL(param_ops_charp);

/* Actually could be a bool or an int, for historical reasons. */
int param_set_bool(const char *val, const struct kernel_param *kp)
{
/* No equals means "set"... */
if (!val) val = "1";

/* One of =[yYnN01] */
return kstrtobool(val, kp->arg);
}
EXPORT_SYMBOL(param_set_bool);

int param_get_bool(char *buffer, const struct kernel_param *kp)
{
/* Y and N chosen as being relatively non-coder friendly */
return sprintf(buffer, "%c\n", *(bool *)kp->arg ? 'Y' : 'N');
}
EXPORT_SYMBOL(param_get_bool);

const struct kernel_param_ops param_ops_bool = {
.flags = KERNEL_PARAM_OPS_FL_NOARG,
.set = param_set_bool,
.get = param_get_bool,
};
EXPORT_SYMBOL(param_ops_bool);

int param_set_bool_enable_only(const char *val, const struct kernel_param *kp)
{
int err;
bool new_value;
bool orig_value = *(bool *)kp->arg;
struct kernel_param dummy_kp = *kp;

dummy_kp.arg = &new_value;

err = param_set_bool(val, &dummy_kp);
if (err)
  return err;

/* Don't let them unset it once it's set! */
if (!new_value && orig_value)
  return -EROFS;

if (new_value)
  err = param_set_bool(val, kp);

return err;
}
EXPORT_SYMBOL_GPL(param_set_bool_enable_only);

const struct kernel_param_ops param_ops_bool_enable_only = {
.flags = KERNEL_PARAM_OPS_FL_NOARG,
.set = param_set_bool_enable_only,
.get = param_get_bool,
};
EXPORT_SYMBOL_GPL(param_ops_bool_enable_only);

/* This one must be bool. */
int param_set_invbool(const char *val, const struct kernel_param *kp)
{
int ret;
bool boolval;
struct kernel_param dummy;

dummy.arg = &boolval;
ret = param_set_bool(val, &dummy);
if (ret == 0)
  *(bool *)kp->arg = !boolval;
return ret;
}
EXPORT_SYMBOL(param_set_invbool);

int param_get_invbool(char *buffer, const struct kernel_param *kp)
{
return sprintf(buffer, "%c\n", (*(bool *)kp->arg) ? 'N' : 'Y');
}
EXPORT_SYMBOL(param_get_invbool);

const struct kernel_param_ops param_ops_invbool = {
.set = param_set_invbool,
.get = param_get_invbool,
};
EXPORT_SYMBOL(param_ops_invbool);

int param_set_bint(const char *val, const struct kernel_param *kp)
{
/* Match bool exactly, by re-using it. */
struct kernel_param boolkp = *kp;
bool v;
int ret;

boolkp.arg = &v;

ret = param_set_bool(val, &boolkp);
if (ret == 0)
  *(int *)kp->arg = v;
return ret;
}
EXPORT_SYMBOL(param_set_bint);

const struct kernel_param_ops param_ops_bint = {
.flags = KERNEL_PARAM_OPS_FL_NOARG,
.set = param_set_bint,
.get = param_get_int,
};
EXPORT_SYMBOL(param_ops_bint);

/* We break the rule and mangle the string. */
static int param_array(struct module *mod,
         const char *name,
         const char *val,
         unsigned int min, unsigned int max,
         void *elem, int elemsize,
         int (*set)(const char *, const struct kernel_param *kp),
         s16 level,
         unsigned int *num)
{
int ret;
struct kernel_param kp;
char save;

/* Get the name right for errors. */
kp.name = name;
kp.arg = elem;
kp.level = level;

*num = 0;
/* We expect a comma-separated list of values. */
do {
  int len;

  if (*num == max) {
   pr_err("%s: can only take %i arguments\n", name, max);
   return -EINVAL;
  }
  len = strcspn(val, ",");

  /* nul-terminate and parse */
  save = val[len];
  ((char *)val)[len] = '\0';
  check_kparam_locked(mod);
  ret = set(val, &kp);

  if (ret != 0)
   return ret;
  kp.arg += elemsize;
  val += len+1;
  (*num)++;
} while (save == ',');

if (*num < min) {
  pr_err("%s: needs at least %i arguments\n", name, min);
  return -EINVAL;
}
return 0;
}

static int param_array_set(const char *val, const struct kernel_param *kp)
{
const struct kparam_array *arr = kp->arr;
unsigned int temp_num;

return param_array(kp->mod, kp->name, val, 1, arr->max, arr->elem,
      arr->elemsize, arr->ops->set, kp->level,
      arr->num ?: &temp_num);
}

static int param_array_get(char *buffer, const struct kernel_param *kp)
{
int i, off, ret;
const struct kparam_array *arr = kp->arr;
struct kernel_param p = *kp;

for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
  /* Replace \n with comma */
  if (i)
   buffer[off - 1] = ',';
  p.arg = arr->elem + arr->elemsize * i;
  check_kparam_locked(p.mod);
  ret = arr->ops->get(buffer + off, &p);
  if (ret < 0)
   return ret;
  off += ret;
}
buffer[off] = '\0';
return off;
}

static void param_array_free(void *arg)
{
unsigned int i;
const struct kparam_array *arr = arg;

if (arr->ops->free)
  for (i = 0; i < (arr->num ? *arr->num : arr->max); i++)
   arr->ops->free(arr->elem + arr->elemsize * i);
}

const struct kernel_param_ops param_array_ops = {
.set = param_array_set,
.get = param_array_get,
.free = param_array_free,
};
EXPORT_SYMBOL(param_array_ops);

int param_set_copystring(const char *val, const struct kernel_param *kp)
{
const struct kparam_string *kps = kp->str;
const size_t len = strnlen(val, kps->maxlen);

if (len == kps->maxlen) {
  pr_err("%s: string doesn't fit in %u chars.\n",
         kp->name, kps->maxlen-1);
  return -ENOSPC;
}
memcpy(kps->string, val, len + 1);
return 0;
}
EXPORT_SYMBOL(param_set_copystring);

int param_get_string(char *buffer, const struct kernel_param *kp)
{
const struct kparam_string *kps = kp->str;
return scnprintf(buffer, PAGE_SIZE, "%s\n", kps->string);
}
EXPORT_SYMBOL(param_get_string);

const struct kernel_param_ops param_ops_string = {
.set = param_set_copystring,
.get = param_get_string,
};
EXPORT_SYMBOL(param_ops_string);

/* sysfs output in /sys/modules/XYZ/parameters/ */
#define to_module_attr(n) container_of_const(n, struct module_attribute, attr)
#define to_module_kobject(n) container_of(n, struct module_kobject, kobj)

struct param_attribute
{
struct module_attribute mattr;
const struct kernel_param *param;
};

struct module_param_attrs
{
unsigned int num;
struct attribute_group grp;
struct param_attribute attrs[] __counted_by(num);
};

#ifdef CONFIG_SYSFS
#define to_param_attr(n) container_of_const(n, struct param_attribute, mattr)

static ssize_t param_attr_show(const struct module_attribute *mattr,
          struct module_kobject *mk, char *buf)
{
int count;
const struct param_attribute *attribute = to_param_attr(mattr);

if (!attribute->param->ops->get)
  return -EPERM;

kernel_param_lock(mk->mod);
count = attribute->param->ops->get(buf, attribute->param);
kernel_param_unlock(mk->mod);
return count;
}

/* sysfs always hands a nul-terminated string in buf.  We rely on that. */
static ssize_t param_attr_store(const struct module_attribute *mattr,
    struct module_kobject *mk,
    const char *buf, size_t len)
{
  int err;
const struct param_attribute *attribute = to_param_attr(mattr);

if (!attribute->param->ops->set)
  return -EPERM;

kernel_param_lock(mk->mod);
if (param_check_unsafe(attribute->param))
  err = attribute->param->ops->set(buf, attribute->param);
else
  err = -EPERM;
kernel_param_unlock(mk->mod);
if (!err)
  return len;
return err;
}
#endif

#ifdef CONFIG_MODULES
#define __modinit
#else
#define __modinit __init
#endif

#ifdef CONFIG_SYSFS
void kernel_param_lock(struct module *mod)
{
mutex_lock(KPARAM_MUTEX(mod));
}

void kernel_param_unlock(struct module *mod)
{
mutex_unlock(KPARAM_MUTEX(mod));
}

EXPORT_SYMBOL(kernel_param_lock);
EXPORT_SYMBOL(kernel_param_unlock);

/*
* add_sysfs_param - add a parameter to sysfs
* @mk: struct module_kobject
* @kp: the actual parameter definition to add to sysfs
* @name: name of parameter
*
* Create a kobject if for a (per-module) parameter if mp NULL, and
* create file in sysfs.  Returns an error on out of memory.  Always cleans up
* if there's an error.
*/
static __modinit int add_sysfs_param(struct module_kobject *mk,
         const struct kernel_param *kp,
         const char *name)
{
struct module_param_attrs *new_mp;
struct attribute **new_attrs;
unsigned int i;

/* We don't bother calling this with invisible parameters. */
BUG_ON(!kp->perm);

if (!mk->mp) {
  /* First allocation. */
  mk->mp = kzalloc(sizeof(*mk->mp), GFP_KERNEL);
  if (!mk->mp)
   return -ENOMEM;
  mk->mp->grp.name = "parameters";
  /* NULL-terminated attribute array. */
  mk->mp->grp.attrs = kzalloc(sizeof(mk->mp->grp.attrs[0]),
         GFP_KERNEL);
  /* Caller will cleanup via free_module_param_attrs */
  if (!mk->mp->grp.attrs)
   return -ENOMEM;
}

/* Enlarge allocations. */
new_mp = krealloc(mk->mp, struct_size(mk->mp, attrs, mk->mp->num + 1),
     GFP_KERNEL);
if (!new_mp)
  return -ENOMEM;
mk->mp = new_mp;
mk->mp->num++;

/* Extra pointer for NULL terminator */
new_attrs = krealloc_array(mk->mp->grp.attrs, mk->mp->num + 1,
       sizeof(mk->mp->grp.attrs[0]), GFP_KERNEL);
if (!new_attrs)
  return -ENOMEM;
mk->mp->grp.attrs = new_attrs;

/* Tack new one on the end. */
memset(&mk->mp->attrs[mk->mp->num - 1], 0, sizeof(mk->mp->attrs[0]));
sysfs_attr_init(&mk->mp->attrs[mk->mp->num - 1].mattr.attr);
mk->mp->attrs[mk->mp->num - 1].param = kp;
mk->mp->attrs[mk->mp->num - 1].mattr.show = param_attr_show;
/* Do not allow runtime DAC changes to make param writable. */
if ((kp->perm & (S_IWUSR | S_IWGRP | S_IWOTH)) != 0)
  mk->mp->attrs[mk->mp->num - 1].mattr.store = param_attr_store;
else
  mk->mp->attrs[mk->mp->num - 1].mattr.store = NULL;
mk->mp->attrs[mk->mp->num - 1].mattr.attr.name = (char *)name;
mk->mp->attrs[mk->mp->num - 1].mattr.attr.mode = kp->perm;

/* Fix up all the pointers, since krealloc can move us */
for (i = 0; i < mk->mp->num; i++)
  mk->mp->grp.attrs[i] = &mk->mp->attrs[i].mattr.attr;
mk->mp->grp.attrs[mk->mp->num] = NULL;
return 0;
}

#ifdef CONFIG_MODULES
static void free_module_param_attrs(struct module_kobject *mk)
{
if (mk->mp)
  kfree(mk->mp->grp.attrs);
kfree(mk->mp);
mk->mp = NULL;
}

/*
* module_param_sysfs_setup - setup sysfs support for one module
* @mod: module
* @kparam: module parameters (array)
* @num_params: number of module parameters
*
* Adds sysfs entries for module parameters under
* /sys/module/[mod->name]/parameters/
*/
int module_param_sysfs_setup(struct module *mod,
        const struct kernel_param *kparam,
        unsigned int num_params)
{
int i, err;
bool params = false;

for (i = 0; i < num_params; i++) {
  if (kparam[i].perm == 0)
   continue;
  err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name);
  if (err) {
   free_module_param_attrs(&mod->mkobj);
   return err;
  }
  params = true;
}

if (!params)
  return 0;

/* Create the param group. */
err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
if (err)
  free_module_param_attrs(&mod->mkobj);
return err;
}

/*
* module_param_sysfs_remove - remove sysfs support for one module
* @mod: module
*
* Remove sysfs entries for module parameters and the corresponding
* kobject.
*/
void module_param_sysfs_remove(struct module *mod)
{
if (mod->mkobj.mp) {
  sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp);
  /*
* We are positive that no one is using any param
* attrs at this point. Deallocate immediately.
*/
  free_module_param_attrs(&mod->mkobj);
}
}
#endif

void destroy_params(const struct kernel_param *params, unsigned num)
{
unsigned int i;

for (i = 0; i < num; i++)
  if (params[i].ops->free)
   params[i].ops->free(params[i].arg);
}

struct module_kobject __modinit * lookup_or_create_module_kobject(const char *name)
{
struct module_kobject *mk;
struct kobject *kobj;
int err;

kobj = kset_find_obj(module_kset, name);
if (kobj)
  return to_module_kobject(kobj);

mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
if (!mk)
  return NULL;

mk->mod = THIS_MODULE;
mk->kobj.kset = module_kset;
err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, "%s", name);
if (IS_ENABLED(CONFIG_MODULES) && !err)
  err = sysfs_create_file(&mk->kobj, &module_uevent.attr);
if (err) {
  kobject_put(&mk->kobj);
  pr_crit("Adding module '%s' to sysfs failed (%d), the system may be unstable.\n",
   name, err);
  return NULL;
}

/* So that we hold reference in both cases. */
kobject_get(&mk->kobj);

return mk;
}

static void __init kernel_add_sysfs_param(const char *name,
       const struct kernel_param *kparam,
       unsigned int name_skip)
{
struct module_kobject *mk;
int err;

mk = lookup_or_create_module_kobject(name);
if (!mk)
  return;

/* We need to remove old parameters before adding more. */
if (mk->mp)
  sysfs_remove_group(&mk->kobj, &mk->mp->grp);

/* These should not fail at boot. */
err = add_sysfs_param(mk, kparam, kparam->name + name_skip);
BUG_ON(err);
err = sysfs_create_group(&mk->kobj, &mk->mp->grp);
BUG_ON(err);
kobject_uevent(&mk->kobj, KOBJ_ADD);
kobject_put(&mk->kobj);
}

/*
* param_sysfs_builtin - add sysfs parameters for built-in modules
*
* Add module_parameters to sysfs for "modules" built into the kernel.
*
* The "module" name (KBUILD_MODNAME) is stored before a dot, the
* "parameter" name is stored behind a dot in kernel_param->name. So,
* extract the "module" name for all built-in kernel_param-eters,
* and for all who have the same, call kernel_add_sysfs_param.
*/
static void __init param_sysfs_builtin(void)
{
const struct kernel_param *kp;
unsigned int name_len;
char modname[MODULE_NAME_LEN];

for (kp = __start___param; kp < __stop___param; kp++) {
  char *dot;

  if (kp->perm == 0)
   continue;

  dot = strchr(kp->name, '.');
  if (!dot) {
   /* This happens for core_param() */
   strscpy(modname, "kernel");
   name_len = 0;
  } else {
   name_len = dot - kp->name + 1;
   strscpy(modname, kp->name, name_len);
  }
  kernel_add_sysfs_param(modname, kp, name_len);
}
}

ssize_t __modver_version_show(const struct module_attribute *mattr,
         struct module_kobject *mk, char *buf)
{
const struct module_version_attribute *vattr =
  container_of_const(mattr, struct module_version_attribute, mattr);

return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version);
}

extern const struct module_version_attribute __start___modver[];
extern const struct module_version_attribute __stop___modver[];

static void __init version_sysfs_builtin(void)
{
const struct module_version_attribute *vattr;
struct module_kobject *mk;
int err;

for (vattr = __start___modver; vattr < __stop___modver; vattr++) {
  mk = lookup_or_create_module_kobject(vattr->module_name);
  if (mk) {
   err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
   WARN_ON_ONCE(err);
   kobject_uevent(&mk->kobj, KOBJ_ADD);
   kobject_put(&mk->kobj);
  }
}
}

/* module-related sysfs stuff */

static ssize_t module_attr_show(struct kobject *kobj,
    struct attribute *attr,
    char *buf)
{
const struct module_attribute *attribute;
struct module_kobject *mk;
int ret;

attribute = to_module_attr(attr);
mk = to_module_kobject(kobj);

if (!attribute->show)
  return -EIO;

ret = attribute->show(attribute, mk, buf);

return ret;
}

static ssize_t module_attr_store(struct kobject *kobj,
    struct attribute *attr,
    const char *buf, size_t len)
{
const struct module_attribute *attribute;
struct module_kobject *mk;
int ret;

attribute = to_module_attr(attr);
mk = to_module_kobject(kobj);

if (!attribute->store)
  return -EIO;

ret = attribute->store(attribute, mk, buf, len);

return ret;
}

static const struct sysfs_ops module_sysfs_ops = {
.show = module_attr_show,
.store = module_attr_store,
};

static int uevent_filter(const struct kobject *kobj)
{
const struct kobj_type *ktype = get_ktype(kobj);

if (ktype == &module_ktype)
  return 1;
return 0;
}

static const struct kset_uevent_ops module_uevent_ops = {
.filter = uevent_filter,
};

struct kset *module_kset;

static void module_kobj_release(struct kobject *kobj)
{
struct module_kobject *mk = to_module_kobject(kobj);

if (mk->kobj_completion)
  complete(mk->kobj_completion);
}

const struct kobj_type module_ktype = {
.release   = module_kobj_release,
.sysfs_ops = &module_sysfs_ops,
};

/*
* param_sysfs_init - create "module" kset
*
* This must be done before the initramfs is unpacked and
* request_module() thus becomes possible, because otherwise the
* module load would fail in mod_sysfs_init.
*/
static int __init param_sysfs_init(void)
{
module_kset = kset_create_and_add("module", &module_uevent_ops, NULL);
if (!module_kset) {
  printk(KERN_WARNING "%s (%d): error creating kset\n",
   __FILE__, __LINE__);
  return -ENOMEM;
}

return 0;
}
subsys_initcall(param_sysfs_init);

/*
* param_sysfs_builtin_init - add sysfs version and parameter
* attributes for built-in modules
*/
static int __init param_sysfs_builtin_init(void)
{
if (!module_kset)
  return -ENOMEM;

version_sysfs_builtin();
param_sysfs_builtin();

return 0;
}
late_initcall(param_sysfs_builtin_init);

#endif /* CONFIG_SYSFS */

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