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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255// SPDX-License-Identifier: GPL-2.0-or-later/* * Create default crypto algorithm instances. * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> */
#include <crypto/internal/aead.h>#include <linux/completion.h>#include <linux/ctype.h>#include <linux/err.h>#include <linux/init.h>#include <linux/kthread.h>#include <linux/module.h>#include <linux/notifier.h>#include <linux/rtnetlink.h>#include <linux/sched/signal.h>#include <linux/slab.h>#include <linux/string.h>
#include "internal.h"
struct cryptomgr_param { struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
struct { struct rtattr attr; struct crypto_attr_type data; } type;
struct { struct rtattr attr; struct crypto_attr_alg data; } attrs[CRYPTO_MAX_ATTRS];
char template[CRYPTO_MAX_ALG_NAME];
struct crypto_larval *larval;
u32 otype; u32 omask;};
struct crypto_test_param { char driver[CRYPTO_MAX_ALG_NAME]; char alg[CRYPTO_MAX_ALG_NAME]; u32 type;};
static int cryptomgr_probe(void *data){ struct cryptomgr_param *param = data; struct crypto_template *tmpl; int err = -ENOENT;
tmpl = crypto_lookup_template(param->template); if (!tmpl) goto out;
do { err = tmpl->create(tmpl, param->tb); } while (err == -EAGAIN && !signal_pending(current));
crypto_tmpl_put(tmpl);
out: param->larval->adult = ERR_PTR(err); param->larval->alg.cra_flags |= CRYPTO_ALG_DEAD; complete_all(¶m->larval->completion); crypto_alg_put(¶m->larval->alg); kfree(param); module_put_and_kthread_exit(0);}
static int cryptomgr_schedule_probe(struct crypto_larval *larval){ struct task_struct *thread; struct cryptomgr_param *param; const char *name = larval->alg.cra_name; const char *p; unsigned int len; int i;
if (!try_module_get(THIS_MODULE)) goto err;
param = kzalloc_obj(*param); if (!param) goto err_put_module;
for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) ;
len = p - name; if (!len || *p != '(') goto err_free_param;
memcpy(param->template, name, len);
i = 0; for (;;) { name = ++p;
for (; isalnum(*p) || *p == '-' || *p == '_'; p++) ;
if (*p == '(') { int recursion = 0;
for (;;) { if (!*++p) goto err_free_param; if (*p == '(') recursion++; else if (*p == ')' && !recursion--) break; }
p++; }
len = p - name; if (!len) goto err_free_param;
param->attrs[i].attr.rta_len = sizeof(param->attrs[i]); param->attrs[i].attr.rta_type = CRYPTOA_ALG; memcpy(param->attrs[i].data.name, name, len);
param->tb[i + 1] = ¶m->attrs[i].attr; i++;
if (i >= CRYPTO_MAX_ATTRS) goto err_free_param;
if (*p == ')') break;
if (*p != ',') goto err_free_param; }
param->tb[i + 1] = NULL;
param->type.attr.rta_len = sizeof(param->type); param->type.attr.rta_type = CRYPTOA_TYPE; param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; param->tb[0] = ¶m->type.attr;
param->otype = larval->alg.cra_flags; param->omask = larval->mask;
crypto_alg_get(&larval->alg); param->larval = larval;
thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); if (IS_ERR(thread)) goto err_put_larval;
return NOTIFY_STOP;
err_put_larval: crypto_alg_put(&larval->alg);err_free_param: kfree(param);err_put_module: module_put(THIS_MODULE);err: return NOTIFY_OK;}
static int cryptomgr_test(void *data){ struct crypto_test_param *param = data; u32 type = param->type; int err;
err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
crypto_alg_tested(param->driver, err);
kfree(param); module_put_and_kthread_exit(0);}
static int cryptomgr_schedule_test(struct crypto_alg *alg){ struct task_struct *thread; struct crypto_test_param *param;
if (!IS_ENABLED(CONFIG_CRYPTO_SELFTESTS)) return NOTIFY_DONE;
if (!try_module_get(THIS_MODULE)) goto err;
param = kzalloc_obj(*param); if (!param) goto err_put_module;
memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); memcpy(param->alg, alg->cra_name, sizeof(param->alg)); param->type = alg->cra_flags;
thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); if (IS_ERR(thread)) goto err_free_param;
return NOTIFY_STOP;
err_free_param: kfree(param);err_put_module: module_put(THIS_MODULE);err: return NOTIFY_OK;}
static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, void *data){ switch (msg) { case CRYPTO_MSG_ALG_REQUEST: return cryptomgr_schedule_probe(data); case CRYPTO_MSG_ALG_REGISTER: return cryptomgr_schedule_test(data); case CRYPTO_MSG_ALG_LOADED: break; }
return NOTIFY_DONE;}
static struct notifier_block cryptomgr_notifier = { .notifier_call = cryptomgr_notify,};
static int __init cryptomgr_init(void){ return crypto_register_notifier(&cryptomgr_notifier);}
static void __exit cryptomgr_exit(void){ int err = crypto_unregister_notifier(&cryptomgr_notifier); BUG_ON(err);}
module_init(cryptomgr_init);module_exit(cryptomgr_exit);
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Crypto Algorithm Manager");