/*
 * AppArmor security module
 *
 * This file contains AppArmor policy loading interface function definitions.
 *
 * Copyright 2013 Canonical Ltd.
 *
 * 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.
 *
 * Fns to provide a checksum of policy that has been loaded this can be
 * compared to userspace policy compiles to check loaded policy is what
 * it should be.
 */

#include <crypto/hash.h>

#include "include/apparmor.h"
#include "include/crypto.h"

static unsigned int apparmor_hash_size;

static struct crypto_shash *apparmor_tfm;

unsigned int aa_hash_size(void)
{
	return apparmor_hash_size;
}

int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
			 size_t len)
{
	struct {
		struct shash_desc shash;
		char ctx[crypto_shash_descsize(apparmor_tfm)];
	} desc;
	int error = -ENOMEM;
	u32 le32_version = cpu_to_le32(version);

	if (!aa_g_hash_policy)
		return 0;

	if (!apparmor_tfm)
		return 0;

	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
	if (!profile->hash)
		goto fail;

	desc.shash.tfm = apparmor_tfm;
	desc.shash.flags = 0;

	error = crypto_shash_init(&desc.shash);
	if (error)
		goto fail;
	error = crypto_shash_update(&desc.shash, (u8 *) &le32_version, 4);
	if (error)
		goto fail;
	error = crypto_shash_update(&desc.shash, (u8 *) start, len);
	if (error)
		goto fail;
	error = crypto_shash_final(&desc.shash, profile->hash);
	if (error)
		goto fail;

	return 0;

fail:
	kfree(profile->hash);
	profile->hash = NULL;

	return error;
}

static int __init init_profile_hash(void)
{
	struct crypto_shash *tfm;

	if (!apparmor_initialized)
		return 0;

	tfm = crypto_alloc_shash("sha1", 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(tfm)) {
		int error = PTR_ERR(tfm);
		AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);
		return error;
	}
	apparmor_tfm = tfm;
	apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm);

	aa_info_message("AppArmor sha1 policy hashing enabled");

	return 0;
}

late_initcall(init_profile_hash);
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>uapi</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>asm-generic</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/Kbuild?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>Kbuild</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='35eeacf1820a08305c2b0960febfa190f5a6dd63'/><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><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-11 02:31:11 -0500</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-02-11 02:31:11 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/Kbuild?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>35eeacf1820a08305c2b0960febfa190f5a6dd63</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/uapi/asm-generic/Kbuild?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>f1227c7384ee01d3f029cc5f82223234e6456c5f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/uapi/asm-generic/Kbuild?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>include/uapi/asm-generic/Kbuild</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/Kbuild?id=bed45f79a2afc9d7c279b880dfcac8f27d513b50'>bed45f79a2afc9d7c279b880dfcac8f27d513b50</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/uapi/asm-generic/Kbuild?id=35eeacf1820a08305c2b0960febfa190f5a6dd63&amp;id2=bed45f79a2afc9d7c279b880dfcac8f27d513b50'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/asm-generic/Kbuild?id=1ee18329fae936089c6c599250ae92482ff2b81f'>1ee18329fae936089c6c599250ae92482ff2b81f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/uapi/asm-generic/Kbuild?id=35eeacf1820a08305c2b0960febfa190f5a6dd63&amp;id2=1ee18329fae936089c6c599250ae92482ff2b81f'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</div><div class='commit-msg'></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=35eeacf1820a08305c2b0960febfa190f5a6dd63'>Diffstat</a> (limited to 'include/uapi/asm-generic/Kbuild')</div><table summary='diffstat' class='diffstat'>