mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Cheers, Rusty. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJWP91+AAoJENkgDmzRrbjxBAAQAJDFEKrMmdhyX56R058RFW1q pYK3XrHrVMCrJRa80UH6MStvCzkR5yYU7q81XAOfl+/9TR3IIi6EPMIC6wYSyiXC JpfnUISEJAuDMYOT19xeFDt2c7oknJnkOM7QWQt6ypY5sGWVHQ3KQUmkqlzaxQ5C Oen9CfFttugmmpO6KDCfIxtMvxkQ1LM6SoTAKTu7LamcVsBCp5It2Me9UwGUxADj 1Phq14U8heJ9ScNYkroutEkWgyZLFJOZExUuNEIMwyooXmWQmZzBiwVwQ72WjstG 2jj3ZiLucVYvBM4k8qnGnlMR4IkymcYlXD1YJ0X7tvBFnp7UGXFKLt2NSqfOskLC 2fRPETf4PLHebZeNN/J/WKJ7qKzsBsS49KjFjJ2vm4+P6sScmcDGXw4eMyLTYfnJ dRbuRtZpnJV4S1vss/STjehOA8A8/fURXQwb80AUzzEEfmjujZWCMYVhfqO91+kx XsbtSciek+Abxyh9Ow9xHgVnMcsXgmZMkpODv4Gjc/4R6Uu6XRSVK04jvkuoLVi5 t4VC00NK0WY2PFVK3qGYE5ZejPTOu59UGRLwxDqZ0QmXF36Yun9f//hSDWpM10BO Ah92OybEnny4tij7/0xz7Krg7u8BQ+at0TAmxrw4Xu9VqbnRqcpJy9Q04e52mwTu G6ztYV2tOGMEh5lK2k0S =WtDm -----END PGP SIGNATURE----- Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull module updates from Rusty Russell: "Nothing exciting, minor tweaks and cleanups" * tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: scripts: [modpost] add new sections to white list modpost: Add flag -E for making section mismatches fatal params: don't ignore the rest of cmdline if parse_one() fails modpost: abort if a module symbol is too long
1015 lines
24 KiB
C
1015 lines
24 KiB
C
/* Helpers for initial module or kernel cmdline parsing
|
|
Copyright (C) 2001 Rusty Russell.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ctype.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(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 void param_check_unsafe(const struct kernel_param *kp)
|
|
{
|
|
if (kp->flags & KERNEL_PARAM_FL_UNSAFE) {
|
|
pr_warn("Setting dangerous option %s - tainting kernel\n",
|
|
kp->name);
|
|
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
|
|
}
|
|
}
|
|
|
|
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,
|
|
int (*handle_unknown)(char *param, char *val,
|
|
const char *doing, void *arg))
|
|
{
|
|
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);
|
|
param_check_unsafe(¶ms[i]);
|
|
err = params[i].ops->set(val, ¶ms[i]);
|
|
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;
|
|
}
|
|
|
|
/* You can use " around spaces, but can't escape ". */
|
|
/* Hyphens and underscores equivalent in parameter names. */
|
|
static char *next_arg(char *args, char **param, char **val)
|
|
{
|
|
unsigned int i, equals = 0;
|
|
int in_quote = 0, quoted = 0;
|
|
char *next;
|
|
|
|
if (*args == '"') {
|
|
args++;
|
|
in_quote = 1;
|
|
quoted = 1;
|
|
}
|
|
|
|
for (i = 0; args[i]; i++) {
|
|
if (isspace(args[i]) && !in_quote)
|
|
break;
|
|
if (equals == 0) {
|
|
if (args[i] == '=')
|
|
equals = i;
|
|
}
|
|
if (args[i] == '"')
|
|
in_quote = !in_quote;
|
|
}
|
|
|
|
*param = args;
|
|
if (!equals)
|
|
*val = NULL;
|
|
else {
|
|
args[equals] = '\0';
|
|
*val = args + equals + 1;
|
|
|
|
/* Don't include quotes in value. */
|
|
if (**val == '"') {
|
|
(*val)++;
|
|
if (args[i-1] == '"')
|
|
args[i-1] = '\0';
|
|
}
|
|
}
|
|
if (quoted && args[i-1] == '"')
|
|
args[i-1] = '\0';
|
|
|
|
if (args[i]) {
|
|
args[i] = '\0';
|
|
next = args + i + 1;
|
|
} else
|
|
next = args + i;
|
|
|
|
/* Chew up trailing spaces. */
|
|
return skip_spaces(next);
|
|
}
|
|
|
|
/* 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,
|
|
int (*unknown)(char *param, char *val,
|
|
const char *doing, void *arg))
|
|
{
|
|
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, \
|
|
*((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);
|
|
|
|
int param_set_charp(const char *val, const struct kernel_param *kp)
|
|
{
|
|
if (strlen(val) > 1024) {
|
|
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(strlen(val)+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", *((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 strtobool(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", *(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 = 0;
|
|
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", (*(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++) {
|
|
if (i)
|
|
buffer[off++] = ',';
|
|
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;
|
|
|
|
if (strlen(val)+1 > kps->maxlen) {
|
|
pr_err("%s: string doesn't fit in %u chars.\n",
|
|
kp->name, kps->maxlen-1);
|
|
return -ENOSPC;
|
|
}
|
|
strcpy(kps->string, val);
|
|
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 strlcpy(buffer, kps->string, kps->maxlen);
|
|
}
|
|
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(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[0];
|
|
};
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
#define to_param_attr(n) container_of(n, struct param_attribute, mattr)
|
|
|
|
static ssize_t param_attr_show(struct module_attribute *mattr,
|
|
struct module_kobject *mk, char *buf)
|
|
{
|
|
int count;
|
|
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);
|
|
if (count > 0) {
|
|
strcat(buf, "\n");
|
|
++count;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/* sysfs always hands a nul-terminated string in buf. We rely on that. */
|
|
static ssize_t param_attr_store(struct module_attribute *mattr,
|
|
struct module_kobject *mk,
|
|
const char *buf, size_t len)
|
|
{
|
|
int err;
|
|
struct param_attribute *attribute = to_param_attr(mattr);
|
|
|
|
if (!attribute->param->ops->set)
|
|
return -EPERM;
|
|
|
|
kernel_param_lock(mk->mod);
|
|
param_check_unsafe(attribute->param);
|
|
err = attribute->param->ops->set(buf, attribute->param);
|
|
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
|
|
* @kparam: 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,
|
|
sizeof(*mk->mp) +
|
|
sizeof(mk->mp->attrs[0]) * (mk->mp->num + 1),
|
|
GFP_KERNEL);
|
|
if (!new_mp)
|
|
return -ENOMEM;
|
|
mk->mp = new_mp;
|
|
|
|
/* Extra pointer for NULL terminator */
|
|
new_attrs = krealloc(mk->mp->grp.attrs,
|
|
sizeof(mk->mp->grp.attrs[0]) * (mk->mp->num + 2),
|
|
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], 0, sizeof(mk->mp->attrs[0]));
|
|
sysfs_attr_init(&mk->mp->attrs[mk->mp->num].mattr.attr);
|
|
mk->mp->attrs[mk->mp->num].param = kp;
|
|
mk->mp->attrs[mk->mp->num].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].mattr.store = param_attr_store;
|
|
else
|
|
mk->mp->attrs[mk->mp->num].mattr.store = NULL;
|
|
mk->mp->attrs[mk->mp->num].mattr.attr.name = (char *)name;
|
|
mk->mp->attrs[mk->mp->num].mattr.attr.mode = kp->perm;
|
|
mk->mp->num++;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
static struct module_kobject * __init locate_module_kobject(const char *name)
|
|
{
|
|
struct module_kobject *mk;
|
|
struct kobject *kobj;
|
|
int err;
|
|
|
|
kobj = kset_find_obj(module_kset, name);
|
|
if (kobj) {
|
|
mk = to_module_kobject(kobj);
|
|
} else {
|
|
mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
|
|
BUG_ON(!mk);
|
|
|
|
mk->mod = THIS_MODULE;
|
|
mk->kobj.kset = module_kset;
|
|
err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
|
|
"%s", name);
|
|
#ifdef CONFIG_MODULES
|
|
if (!err)
|
|
err = sysfs_create_file(&mk->kobj, &module_uevent.attr);
|
|
#endif
|
|
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 = locate_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() */
|
|
strcpy(modname, "kernel");
|
|
name_len = 0;
|
|
} else {
|
|
name_len = dot - kp->name + 1;
|
|
strlcpy(modname, kp->name, name_len);
|
|
}
|
|
kernel_add_sysfs_param(modname, kp, name_len);
|
|
}
|
|
}
|
|
|
|
ssize_t __modver_version_show(struct module_attribute *mattr,
|
|
struct module_kobject *mk, char *buf)
|
|
{
|
|
struct module_version_attribute *vattr =
|
|
container_of(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 **p;
|
|
struct module_kobject *mk;
|
|
int err;
|
|
|
|
for (p = __start___modver; p < __stop___modver; p++) {
|
|
const struct module_version_attribute *vattr = *p;
|
|
|
|
mk = locate_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)
|
|
{
|
|
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)
|
|
{
|
|
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(struct kset *kset, struct kobject *kobj)
|
|
{
|
|
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;
|
|
int module_sysfs_initialized;
|
|
|
|
static void module_kobj_release(struct kobject *kobj)
|
|
{
|
|
struct module_kobject *mk = to_module_kobject(kobj);
|
|
complete(mk->kobj_completion);
|
|
}
|
|
|
|
struct kobj_type module_ktype = {
|
|
.release = module_kobj_release,
|
|
.sysfs_ops = &module_sysfs_ops,
|
|
};
|
|
|
|
/*
|
|
* param_sysfs_init - wrapper for built-in params support
|
|
*/
|
|
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;
|
|
}
|
|
module_sysfs_initialized = 1;
|
|
|
|
version_sysfs_builtin();
|
|
param_sysfs_builtin();
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(param_sysfs_init);
|
|
|
|
#endif /* CONFIG_SYSFS */
|