Release 4.7 crypto/api.c

/*
 * Scatterlist Cryptographic API.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
 * and Nettle, by Niels Möller.
 *
 * 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.
 *
 */

#include <linux/err.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "internal.h"


LIST_HEAD(crypto_alg_list);

EXPORT_SYMBOL_GPL(crypto_alg_list);

DECLARE_RWSEM(crypto_alg_sem);

EXPORT_SYMBOL_GPL(crypto_alg_sem);


BLOCKING_NOTIFIER_HEAD(crypto_chain);

EXPORT_SYMBOL_GPL(crypto_chain);

static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);



struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
{
	return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
}
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james morris
15
55.56%
2
40.00%
herbert xu
herbert xu
11
40.74%
2
40.00%
christoph hellwig
christoph hellwig
1
3.70%
1
20.00%
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27
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(crypto_mod_get);



void crypto_mod_put(struct crypto_alg *alg)
{
	struct module *module = alg->cra_module;

	crypto_alg_put(alg);
	module_put(module);
}
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james morris
12
41.38%
2
33.33%
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christoph hellwig
1
3.45%
1
16.67%
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29
100.00%
6
100.00%


EXPORT_SYMBOL_GPL(crypto_mod_put);



static inline int crypto_is_test_larval(struct crypto_larval *larval)
{
	return larval->alg.cra_driver_name[0];
}

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static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
					      u32 mask)
{
	struct crypto_alg *q, *alg = NULL;
	int best = -2;

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
		int exact, fuzzy;

		if (crypto_is_moribund(q))
			continue;

		if ((q->cra_flags ^ type) & mask)
			continue;

		if (crypto_is_larval(q) &&
		    !crypto_is_test_larval((struct crypto_larval *)q) &&
		    ((struct crypto_larval *)q)->mask != mask)
			continue;

		exact = !strcmp(q->cra_driver_name, name);
		fuzzy = !strcmp(q->cra_name, name);
		if (!exact && !(fuzzy && q->cra_priority > best))
			continue;

		if (unlikely(!crypto_mod_get(q)))
			continue;

		best = q->cra_priority;
		if (alg)
			crypto_mod_put(alg);
		alg = q;

		if (exact)
			break;
	}

	return alg;
}

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james morris
52
28.42%
5
41.67%
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183
100.00%
12
100.00%



static void crypto_larval_destroy(struct crypto_alg *alg)
{
	struct crypto_larval *larval = (void *)alg;

	BUG_ON(!crypto_is_larval(alg));
	if (larval->adult)
		crypto_mod_put(larval->adult);
	kfree(larval);
}

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49
100.00%
1
100.00%



struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
{
	struct crypto_larval *larval;

	larval = kzalloc(sizeof(*larval), GFP_KERNEL);
	if (!larval)
		return ERR_PTR(-ENOMEM);

	larval->mask = mask;
	larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
	larval->alg.cra_priority = -1;
	larval->alg.cra_destroy = crypto_larval_destroy;

	strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
	init_completion(&larval->completion);

	return larval;
}
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4
100.00%


EXPORT_SYMBOL_GPL(crypto_larval_alloc);



static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
					    u32 mask)
{
	struct crypto_alg *alg;
	struct crypto_larval *larval;

	larval = crypto_larval_alloc(name, type, mask);
	if (IS_ERR(larval))
		return ERR_CAST(larval);

	atomic_set(&larval->alg.cra_refcnt, 2);

	down_write(&crypto_alg_sem);
	alg = __crypto_alg_lookup(name, type, mask);
	if (!alg) {
		alg = &larval->alg;
		list_add(&alg->cra_list, &crypto_alg_list);
	}
	up_write(&crypto_alg_sem);

	if (alg != &larval->alg) {
		kfree(larval);
		if (crypto_is_larval(alg))
			alg = crypto_larval_wait(alg);
	}

	return alg;
}

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4
100.00%



void crypto_larval_kill(struct crypto_alg *alg)
{
	struct crypto_larval *larval = (void *)alg;

	down_write(&crypto_alg_sem);
	list_del(&alg->cra_list);
	up_write(&crypto_alg_sem);
	complete_all(&larval->completion);
	crypto_alg_put(alg);
}
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2
100.00%


EXPORT_SYMBOL_GPL(crypto_larval_kill);



static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
{
	struct crypto_larval *larval = (void *)alg;
	long timeout;

	timeout = wait_for_completion_killable_timeout(
		&larval->completion, 60 * HZ);

	alg = larval->adult;
	if (timeout < 0)
		alg = ERR_PTR(-EINTR);
	else if (!timeout)
		alg = ERR_PTR(-ETIMEDOUT);
	else if (!alg)
		alg = ERR_PTR(-ENOENT);
	else if (crypto_is_test_larval(larval) &&
		 !(alg->cra_flags & CRYPTO_ALG_TESTED))
		alg = ERR_PTR(-EAGAIN);
	else if (!crypto_mod_get(alg))
		alg = ERR_PTR(-EAGAIN);
	crypto_mod_put(&larval->alg);

	return alg;
}

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herbert xu
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4
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142
100.00%
4
100.00%



struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask)
{
	struct crypto_alg *alg;

	down_read(&crypto_alg_sem);
	alg = __crypto_alg_lookup(name, type, mask);
	up_read(&crypto_alg_sem);

	return alg;
}
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herbert xu
39
79.59%
2
50.00%
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james morris
10
20.41%
2
50.00%
Total
49
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(crypto_alg_lookup);



struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
{
	struct crypto_alg *alg;

	if (!name)
		return ERR_PTR(-ENOENT);

	mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
	type &= mask;

	alg = crypto_alg_lookup(name, type, mask);
	if (!alg) {
		request_module("crypto-%s", name);

		if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
		      CRYPTO_ALG_NEED_FALLBACK))
			request_module("crypto-%s-all", name);

		alg = crypto_alg_lookup(name, type, mask);
	}

	if (alg)
		return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;

	return crypto_larval_add(name, type, mask);
}
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herbert xu
herbert xu
111
83.46%
7
70.00%
adrian bunk
adrian bunk
17
12.78%
1
10.00%
alex riesen
alex riesen
3
2.26%
1
10.00%
kees cook
kees cook
2
1.50%
1
10.00%
Total
133
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(crypto_larval_lookup);



int crypto_probing_notify(unsigned long val, void *v)
{
	int ok;

	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	if (ok == NOTIFY_DONE) {
		request_module("cryptomgr");
		ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	}

	return ok;
}
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herbert xu
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100.00%
1
100.00%


EXPORT_SYMBOL_GPL(crypto_probing_notify);



struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
{
	struct crypto_alg *alg;
	struct crypto_alg *larval;
	int ok;

	if (!((type | mask) & CRYPTO_ALG_TESTED)) {
		type |= CRYPTO_ALG_TESTED;
		mask |= CRYPTO_ALG_TESTED;
	}

	/*
         * If the internal flag is set for a cipher, require a caller to
         * to invoke the cipher with the internal flag to use that cipher.
         * Also, if a caller wants to allocate a cipher that may or may
         * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
         * !(mask & CRYPTO_ALG_INTERNAL).
         */
	if (!((type | mask) & CRYPTO_ALG_INTERNAL))
		mask |= CRYPTO_ALG_INTERNAL;

	larval = crypto_larval_lookup(name, type, mask);
	if (IS_ERR(larval) || !crypto_is_larval(larval))
		return larval;

	ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);

	if (ok == NOTIFY_STOP)
		alg = crypto_larval_wait(larval);
	else {
		crypto_mod_put(larval);
		alg = ERR_PTR(-ENOENT);
	}
	crypto_larval_kill(larval);
	return alg;
}
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herbert xu
herbert xu
125
86.21%
7
77.78%
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stephan mueller
18
12.41%
1
11.11%
adrian bunk
adrian bunk
2
1.38%
1
11.11%
Total
145
100.00%
9
100.00%


EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);



static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;

	if (type_obj)
		return type_obj->init(tfm, type, mask);

	switch (crypto_tfm_alg_type(tfm)) {
	case CRYPTO_ALG_TYPE_CIPHER:
		return crypto_init_cipher_ops(tfm);

	case CRYPTO_ALG_TYPE_COMPRESS:
		return crypto_init_compress_ops(tfm);

	default:
		break;
	}

	BUG();
	return -EINVAL;
}

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james morris
47
58.02%
5
71.43%
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herbert xu
34
41.98%
2
28.57%
Total
81
100.00%
7
100.00%



static void crypto_exit_ops(struct crypto_tfm *tfm)
{
	const struct crypto_type *type = tfm->__crt_alg->cra_type;

	if (type) {
		if (tfm->exit)
			tfm->exit(tfm);
		return;
	}

	switch (crypto_tfm_alg_type(tfm)) {
	case CRYPTO_ALG_TYPE_CIPHER:
		crypto_exit_cipher_ops(tfm);
		break;

	case CRYPTO_ALG_TYPE_COMPRESS:
		crypto_exit_compress_ops(tfm);
		break;

	default:
		BUG();
	}
}

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james morris
41
55.41%
3
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herbert xu
32
43.24%
2
33.33%
david s. miller
david s. miller
1
1.35%
1
16.67%
Total
74
100.00%
6
100.00%



static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
{
	const struct crypto_type *type_obj = alg->cra_type;
	unsigned int len;

	len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	if (type_obj)
		return len + type_obj->ctxsize(alg, type, mask);

	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
	default:
		BUG();

	case CRYPTO_ALG_TYPE_CIPHER:
		len += crypto_cipher_ctxsize(alg);
		break;

	case CRYPTO_ALG_TYPE_COMPRESS:
		len += crypto_compress_ctxsize(alg);
		break;
	}

	return len;
}

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herbert xu
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103
100.00%
3
100.00%



void crypto_shoot_alg(struct crypto_alg *alg)
{
	down_write(&crypto_alg_sem);
	alg->cra_flags |= CRYPTO_ALG_DYING;
	up_write(&crypto_alg_sem);
}
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28
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(crypto_shoot_alg);



struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
				      u32 mask)
{
	struct crypto_tfm *tfm = NULL;
	unsigned int tfm_size;
	int err = -ENOMEM;

	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
	tfm = kzalloc(tfm_size, GFP_KERNEL);
	if (tfm == NULL)
		goto out_err;

	tfm->__crt_alg = alg;

	err = crypto_init_ops(tfm, type, mask);
	if (err)
		goto out_free_tfm;

	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
		goto cra_init_failed;

	goto out;

cra_init_failed:
	crypto_exit_ops(tfm);
out_free_tfm:
	if (err == -EAGAIN)
		crypto_shoot_alg(alg);
	kfree(tfm);
out_err:
	tfm = ERR_PTR(err);
out:
	return tfm;
}
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herbert xu
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35.71%
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james morris
58
35.80%
5
35.71%
david s. miller
david s. miller
3
1.85%
1
7.14%
adam richter
adam richter
3
1.85%
1
7.14%
akinobu mita
akinobu mita
3
1.85%
1
7.14%
eric sesterhenn
eric sesterhenn
1
0.62%
1
7.14%
Total
162
100.00%
14
100.00%


EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);

/*
 *      crypto_alloc_base - Locate algorithm and allocate transform
 *      @alg_name: Name of algorithm
 *      @type: Type of algorithm
 *      @mask: Mask for type comparison
 *
 *      This function should not be used by new algorithm types.
 *      Please use crypto_alloc_tfm instead.
 *
 *      crypto_alloc_base() will first attempt to locate an already loaded
 *      algorithm.  If that fails and the kernel supports dynamically loadable
 *      modules, it will then attempt to load a module of the same name or
 *      alias.  If that fails it will send a query to any loaded crypto manager
 *      to construct an algorithm on the fly.  A refcount is grabbed on the
 *      algorithm which is then associated with the new transform.
 *
 *      The returned transform is of a non-determinate type.  Most people
 *      should use one of the more specific allocation functions such as
 *      crypto_alloc_blkcipher.
 *
 *      In case of error the return value is an error pointer.
 */


struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
{
	struct crypto_tfm *tfm;
	int err;

	for (;;) {
		struct crypto_alg *alg;

		alg = crypto_alg_mod_lookup(alg_name, type, mask);
		if (IS_ERR(alg)) {
			err = PTR_ERR(alg);
			goto err;
		}

		tfm = __crypto_alloc_tfm(alg, type, mask);
		if (!IS_ERR(tfm))
			return tfm;

		crypto_mod_put(alg);
		err = PTR_ERR(tfm);

err:
		if (err != -EAGAIN)
			break;
		if (fatal_signal_pending(current)) {
			err = -EINTR;
			break;
		}
	}

	return ERR_PTR(err);
}
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12.03%
1
25.00%
Total
133
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(crypto_alloc_base);



void *crypto_create_tfm(struct crypto_alg *alg,
			const struct crypto_type *frontend)
{
	char *mem;
	struct crypto_tfm *tfm = NULL;
	unsigned int tfmsize;
	unsigned int total;
	int err = -ENOMEM;

	tfmsize = frontend->tfmsize;
	total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);

	mem = kzalloc(total, GFP_KERNEL);
	if (mem == NULL)
		goto out_err;

	tfm = (struct crypto_tfm *)(mem + tfmsize);
	tfm->__crt_alg = alg;

	err = frontend->init_tfm(tfm);
	if (err)
		goto out_free_tfm;

	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
		goto cra_init_failed;

	goto out;

cra_init_failed:
	crypto_exit_ops(tfm);
out_free_tfm:
	if (err == -EAGAIN)
		crypto_shoot_alg(alg);
	kfree(mem);
out_err:
	mem = ERR_PTR(err);
out:
	return mem;
}
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EXPORT_SYMBOL_GPL(crypto_create_tfm);



struct crypto_alg *crypto_find_alg(const char *alg_name,
				   const struct crypto_type *frontend,
				   u32 type, u32 mask)
{
	struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
		crypto_alg_mod_lookup;

	if (frontend) {
		type &= frontend->maskclear;
		mask &= frontend->maskclear;
		type |= frontend->type;
		mask |= frontend->maskset;

		if (frontend->lookup)
			lookup = frontend->lookup;
	}

	return lookup(alg_name, type, mask);
}
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2
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98
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(crypto_find_alg);

/*
 *      crypto_alloc_tfm - Locate algorithm and allocate transform
 *      @alg_name: Name of algorithm
 *      @frontend: Frontend algorithm type
 *      @type: Type of algorithm
 *      @mask: Mask for type comparison
 *
 *      crypto_alloc_tfm() will first attempt to locate an already loaded
 *      algorithm.  If that fails and the kernel supports dynamically loadable
 *      modules, it will then attempt to load a module of the same name or
 *      alias.  If that fails it will send a query to any loaded crypto manager
 *      to construct an algorithm on the fly.  A refcount is grabbed on the
 *      algorithm which is then associated with the new transform.
 *
 *      The returned transform is of a non-determinate type.  Most people
 *      should use one of the more specific allocation functions such as
 *      crypto_alloc_blkcipher.
 *
 *      In case of error the return value is an error pointer.
 */


void *crypto_alloc_tfm(const char *alg_name,
		       const struct crypto_type *frontend, u32 type, u32 mask)
{
	void *tfm;
	int err;

	for (;;) {
		struct crypto_alg *alg;

		alg = crypto_find_alg(alg_name, frontend, type, mask);
		if (IS_ERR(alg)) {
			err = PTR_ERR(alg);
			goto err;
		}

		tfm = crypto_create_tfm(alg, frontend);
		if (!IS_ERR(tfm))
			return tfm;

		crypto_mod_put(alg);
		err = PTR_ERR(tfm);

err:
		if (err != -EAGAIN)
			break;
		if (fatal_signal_pending(current)) {
			err = -EINTR;
			break;
		}
	}

	return ERR_PTR(err);
}
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EXPORT_SYMBOL_GPL(crypto_alloc_tfm);

/*
 *      crypto_destroy_tfm - Free crypto transform
 *      @mem: Start of tfm slab
 *      @tfm: Transform to free
 *
 *      This function frees up the transform and any associated resources,
 *      then drops the refcount on the associated algorithm.
 */


void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
{
	struct crypto_alg *alg;

	if (unlikely(!mem))
		return;

	alg = tfm->__crt_alg;

	if (!tfm->exit && alg->cra_exit)
		alg->cra_exit(tfm);
	crypto_exit_ops(tfm);
	crypto_mod_put(alg);
	kzfree(mem);
}
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18
26.87%
4
36.36%
jesper juhl
jesper juhl
12
17.91%
1
9.09%
david s. miller
david s. miller
10
14.93%
1
9.09%
johannes weiner
johannes weiner
1
1.49%
1
9.09%
Total
67
100.00%
11
100.00%


EXPORT_SYMBOL_GPL(crypto_destroy_tfm);



int crypto_has_alg(const char *name, u32 type, u32 mask)
{
	int ret = 0;
	struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);

	if (!IS_ERR(alg)) {
		crypto_mod_put(alg);
		ret = 1;
	}

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
57
100.00%
1
100.00%
Total
57
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(crypto_has_alg);

MODULE_DESCRIPTION("Cryptographic core API");
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
herbert xu
herbert xu
2047
84.17%
29
50.00%
james morris
james morris
273
11.23%
11
18.97%
adrian bunk
adrian bunk
22
0.90%
1
1.72%
akinobu mita
akinobu mita
19
0.78%
1
1.72%
stephan mueller
stephan mueller
18
0.74%
1
1.72%
david s. miller
david s. miller
17
0.70%
4
6.90%
jesper juhl
jesper juhl
12
0.49%
1
1.72%
sebastian andrzej siewior
sebastian andrzej siewior
10
0.41%
1
1.72%
alex riesen
alex riesen
3
0.12%
1
1.72%
adam richter
adam richter
3
0.12%
1
1.72%
christoph hellwig
christoph hellwig
2
0.08%
2
3.45%
kees cook
kees cook
2
0.08%
1
1.72%
johannes weiner
johannes weiner
1
0.04%
1
1.72%
cristian stoica
cristian stoica
1
0.04%
1
1.72%
richard hartmann
richard hartmann
1
0.04%
1
1.72%
eric sesterhenn
eric sesterhenn
1
0.04%
1
1.72%
Total
2432
100.00%
58
100.00%
  
Directory: crypto

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