/*
 * Copyright (C) 2011 Intel Corporation
 *
 * Author:
 * Dmitry Kasatkin <dmitry.kasatkin@intel.com>
 *
 * 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, version 2 of the License.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/err.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/key-type.h>
#include <linux/digsig.h>
#include <crypto/public_key.h>
#include <keys/system_keyring.h>

#include "integrity.h"

static struct key *keyring[INTEGRITY_KEYRING_MAX];

static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
#ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
	"_evm",
	"_ima",
#else
	".evm",
	".ima",
#endif
	"_module",
};

#ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING
static bool init_keyring __initdata = true;
#else
static bool init_keyring __initdata;
#endif

#ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
#define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted
#else
#define restrict_link_to_ima restrict_link_by_builtin_trusted
#endif

int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
			    const char *digest, int digestlen)
{
	if (id >= INTEGRITY_KEYRING_MAX || siglen < 2)
		return -EINVAL;

	if (!keyring[id]) {
		keyring[id] =
			request_key(&key_type_keyring, keyring_name[id], NULL);
		if (IS_ERR(keyring[id])) {
			int err = PTR_ERR(keyring[id]);
			pr_err("no %s keyring: %d\n", keyring_name[id], err);
			keyring[id] = NULL;
			return err;
		}
	}

	switch (sig[1]) {
	case 1:
		/* v1 API expect signature without xattr type */
		return digsig_verify(keyring[id], sig + 1, siglen - 1,
				     digest, digestlen);
	case 2:
		return asymmetric_verify(keyring[id], sig, siglen,
					 digest, digestlen);
	}

	return -EOPNOTSUPP;
}

int __init integrity_init_keyring(const unsigned int id)
{
	const struct cred *cred = current_cred();
	int err = 0;

	if (!init_keyring)
		return 0;

	keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
				    KGIDT_INIT(0), cred,
				    ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
				     KEY_USR_VIEW | KEY_USR_READ |
				     KEY_USR_WRITE | KEY_USR_SEARCH),
				    KEY_ALLOC_NOT_IN_QUOTA,
				    restrict_link_to_ima, NULL);
	if (IS_ERR(keyring[id])) {
		err = PTR_ERR(keyring[id]);
		pr_info("Can't allocate %s keyring (%d)\n",
			keyring_name[id], err);
		keyring[id] = NULL;
	}
	return err;
}

int __init integrity_load_x509(const unsigned int id, const char *path)
{
	key_ref_t key;
	char *data;
	int rc;

	if (!keyring[id])
		return -EINVAL;

	rc = integrity_read_file(path, &data);
	if (rc < 0)
		return rc;

	key = key_create_or_update(make_key_ref(keyring[id], 1),
				   "asymmetric",
				   NULL,
				   data,
				   rc,
				   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
				    KEY_USR_VIEW | KEY_USR_READ),
				   KEY_ALLOC_NOT_IN_QUOTA);
	if (IS_ERR(key)) {
		rc = PTR_ERR(key);
		pr_err("Problem loading X.509 certificate (%d): %s\n",
		       rc, path);
	} else {
		pr_notice("Loaded X.509 cert '%s': %s\n",
			  key_ref_to_ptr(key)->description, path);
		key_ref_put(key);
	}
	kfree(data);
	return 0;
}
0a019a28e0ca0af7dc2691d1a9527960b07ad2bb'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/diff/include/sound/dmaengine_pcm.h?h=nds-private-remove&amp;id=0a019a28e0ca0af7dc2691d1a9527960b07ad2bb'>dmaengine_pcm.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='0a019a28e0ca0af7dc2691d1a9527960b07ad2bb'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=0a019a28e0ca0af7dc2691d1a9527960b07ad2bb'>Diffstat</a> (limited to 'include/sound/dmaengine_pcm.h')</div><table summary='diffstat' class='diffstat'>