Release 4.15 kernel/params.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 : &param_lock)
#else

#define KPARAM_MUTEX(mod)	(&param_lock)
#endif



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


static inline void check_kparam_locked(struct module *mod)
{
}
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#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;
}

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/* 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);
}

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

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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;
}

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

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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);
	}
}

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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(&params[i]);
			err = params[i].ops->set(val, &params[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;
}

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25
9.77%
2
13.33%
Dan Streetman
14
5.47%
1
6.67%
Luis R. Rodriguez
10
3.91%
1
6.67%
Steven Rostedt
5
1.95%
1
6.67%
Andrew Morton
1
0.39%
1
6.67%
Lucas De Marchi
1
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1
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Jani Nikula
1
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/* 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, &param, &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;
}

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2
18.18%
Ard van Breemen
21
8.30%
1
9.09%
Oleg Nesterov
19
7.51%
1
9.09%
Luis R. Rodriguez
10
3.95%
1
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Pawel Moll
10
3.95%
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Peter Oberparleiter
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/* 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);



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;
}
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130
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6
100.00%


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));
}
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EXPORT_SYMBOL(param_get_charp);



void param_free_charp(void *arg)
{
	maybe_kfree_parameter(*((char **)arg));
}
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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);
}
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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');
}
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100.00%


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;
}
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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;
}
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3
4.69%
1
20.00%
Total
64
100.00%
5
100.00%


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');
}
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31.58%
1
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Jean Delvare
1
2.63%
1
20.00%
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38
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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;
}
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2
100.00%


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;
}

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18
7.89%
1
8.33%
Dan Streetman
6
2.63%
1
8.33%
Pawel Moll
4
1.75%
1
8.33%
Jim Cromie
2
0.88%
1
8.33%
Richard Knutsson
1
0.44%
1
8.33%
Adrian Bunk
1
0.44%
1
8.33%
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228
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12
100.00%



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);
}

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42
54.55%
4
44.44%
Andrew Morton
23
29.87%
1
11.11%
Bert Wesarg
5
6.49%
1
11.11%
Dan Streetman
4
5.19%
1
11.11%
Jan Beulich
2
2.60%
1
11.11%
Pawel Moll
1
1.30%
1
11.11%
Total
77
100.00%
9
100.00%



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;
}

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54.86%
1
10.00%
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55
38.19%
5
50.00%
Dan Streetman
5
3.47%
2
20.00%
Jean Delvare
3
2.08%
1
10.00%
Jan Beulich
2
1.39%
1
10.00%
Total
144
100.00%
10
100.00%



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);
}

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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;
}
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69
95.83%
2
50.00%
Jan Beulich
2
2.78%
1
25.00%
Jim Cromie
1
1.39%
1
25.00%
Total
72
100.00%
4
100.00%


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);
}
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Arnd Bergmann
31
79.49%
1
25.00%
Jean Delvare
5
12.82%
1
25.00%
Jan Beulich
2
5.13%
1
25.00%
Rusty Russell
1
2.56%
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25.00%
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39
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4
100.00%


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);
	return count;
}

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6
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/* 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;
}
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7
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#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));
}

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

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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