/security/selinux/ss/services.c

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/*
 * Implementation of the security services.
 *
 * Authors : Stephen Smalley, <sds@epoch.ncsc.mil>
 *	     James Morris <jmorris@redhat.com>
 *
 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
 *
 *	Support for enhanced MLS infrastructure.
 *	Support for context based audit filters.
 *
 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
 *
 *	Added conditional policy language extensions
 *
 * Updated: Hewlett-Packard <paul@paul-moore.com>
 *
 *      Added support for NetLabel
 *      Added support for the policy capability bitmap
 *
 * Updated: Chad Sellers <csellers@tresys.com>
 *
 *  Added validation of kernel classes and permissions
 *
 * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 *  Added support for bounds domain and audit messaged on masked permissions
 *
 * Updated: Guido Trentalancia <guido@trentalancia.com>
 *
 *  Added support for runtime switching of the policy type
 *
 * Copyright (C) 2008, 2009 NEC Corporation
 * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
 * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
 * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
 * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.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.
 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/sched.h>
#include <linux/audit.h>
#include <linux/mutex.h>
#include <linux/selinux.h>
#include <linux/flex_array.h>
#include <linux/vmalloc.h>
#include <net/netlabel.h>

#include "flask.h"
#include "avc.h"
#include "avc_ss.h"
#include "security.h"
#include "context.h"
#include "policydb.h"
#include "sidtab.h"
#include "services.h"
#include "conditional.h"
#include "mls.h"
#include "objsec.h"
#include "netlabel.h"
#include "xfrm.h"
#include "ebitmap.h"
#include "audit.h"

int selinux_policycap_netpeer;
int selinux_policycap_openperm;

static DEFINE_RWLOCK(policy_rwlock);

static struct sidtab sidtab;
struct policydb policydb;
int ss_initialized;

static u32 latest_granting;

static int context_struct_to_string(struct context *context, char **scontext,
				    u32 *scontext_len);

static void context_struct_compute_av(struct context *scontext,
				      struct context *tcontext,
				      u16 tclass,
				      struct av_decision *avd);

struct selinux_mapping {
	u16 value; 
	unsigned num_perms;
	u32 perms[sizeof(u32) * 8];
};

static struct selinux_mapping *current_mapping;
static u16 current_mapping_size;

static int selinux_set_mapping(struct policydb *pol,
			       struct security_class_mapping *map,
			       struct selinux_mapping **out_map_p,
			       u16 *out_map_size)
{
	struct selinux_mapping *out_map = NULL;
	size_t size = sizeof(struct selinux_mapping);
	u16 i, j;
	unsigned k;
	bool print_unknown_handle = false;

	
	if (!map)
		return -EINVAL;
	i = 0;
	while (map[i].name)
		i++;

	
	out_map = kcalloc(++i, size, GFP_ATOMIC);
	if (!out_map)
		return -ENOMEM;

	
	j = 0;
	while (map[j].name) {
		struct security_class_mapping *p_in = map + (j++);
		struct selinux_mapping *p_out = out_map + j;

		
		if (!strcmp(p_in->name, "")) {
			p_out->num_perms = 0;
			continue;
		}

		p_out->value = string_to_security_class(pol, p_in->name);
		if (!p_out->value) {
			printk(KERN_INFO
			       "SELinux:  Class %s not defined in policy.\n",
			       p_in->name);
			if (pol->reject_unknown)
				goto err;
			p_out->num_perms = 0;
			print_unknown_handle = true;
			continue;
		}

		k = 0;
		while (p_in->perms && p_in->perms[k]) {
			
			if (!*p_in->perms[k]) {
				k++;
				continue;
			}
			p_out->perms[k] = string_to_av_perm(pol, p_out->value,
							    p_in->perms[k]);
			if (!p_out->perms[k]) {
				printk(KERN_INFO
				       "SELinux:  Permission %s in class %s not defined in policy.\n",
				       p_in->perms[k], p_in->name);
				if (pol->reject_unknown)
					goto err;
				print_unknown_handle = true;
			}

			k++;
		}
		p_out->num_perms = k;
	}

	if (print_unknown_handle)
		printk(KERN_INFO "SELinux: the above unknown classes and permissions will be %s\n",
		       pol->allow_unknown ? "allowed" : "denied");

	*out_map_p = out_map;
	*out_map_size = i;
	return 0;
err:
	kfree(out_map);
	return -EINVAL;
}


static u16 unmap_class(u16 tclass)
{
	if (tclass < current_mapping_size)
		return current_mapping[tclass].value;

	return tclass;
}

static u16 map_class(u16 pol_value)
{
	u16 i;

	for (i = 1; i < current_mapping_size; i++) {
		if (current_mapping[i].value == pol_value)
			return i;
	}

	return SECCLASS_NULL;
}

static void map_decision(u16 tclass, struct av_decision *avd,
			 int allow_unknown)
{
	if (tclass < current_mapping_size) {
		unsigned i, n = current_mapping[tclass].num_perms;
		u32 result;

		for (i = 0, result = 0; i < n; i++) {
			if (avd->allowed & current_mapping[tclass].perms[i])
				result |= 1<<i;
			if (allow_unknown && !current_mapping[tclass].perms[i])
				result |= 1<<i;
		}
		avd->allowed = result;

		for (i = 0, result = 0; i < n; i++)
			if (avd->auditallow & current_mapping[tclass].perms[i])
				result |= 1<<i;
		avd->auditallow = result;

		for (i = 0, result = 0; i < n; i++) {
			if (avd->auditdeny & current_mapping[tclass].perms[i])
				result |= 1<<i;
			if (!allow_unknown && !current_mapping[tclass].perms[i])
				result |= 1<<i;
		}
		for (; i < (sizeof(u32)*8); i++)
			result |= 1<<i;
		avd->auditdeny = result;
	}
}

int security_mls_enabled(void)
{
	return policydb.mls_enabled;
}

static int constraint_expr_eval(struct context *scontext,
				struct context *tcontext,
				struct context *xcontext,
				struct constraint_expr *cexpr)
{
	u32 val1, val2;
	struct context *c;
	struct role_datum *r1, *r2;
	struct mls_level *l1, *l2;
	struct constraint_expr *e;
	int s[CEXPR_MAXDEPTH] = {0};
	int sp = -1;

	for (e = cexpr; e; e = e->next) {
		switch (e->expr_type) {
		case CEXPR_NOT:
			BUG_ON(sp < 0);
			s[sp] = !s[sp];
			break;
		case CEXPR_AND:
			BUG_ON(sp < 1);
			sp--;
			s[sp] &= s[sp + 1];
			break;
		case CEXPR_OR:
			BUG_ON(sp < 1);
			sp--;
			s[sp] |= s[sp + 1];
			break;
		case CEXPR_ATTR:
			if (sp == (CEXPR_MAXDEPTH - 1))
				return 0;
			switch (e->attr) {
			case CEXPR_USER:
				val1 = scontext->user;
				val2 = tcontext->user;
				break;
			case CEXPR_TYPE:
				val1 = scontext->type;
				val2 = tcontext->type;
				break;
			case CEXPR_ROLE:
				val1 = scontext->role;
				val2 = tcontext->role;
				r1 = policydb.role_val_to_struct[val1 - 1];
				r2 = policydb.role_val_to_struct[val2 - 1];
				switch (e->op) {
				case CEXPR_DOM:
					s[++sp] = ebitmap_get_bit(&r1->dominates,
								  val2 - 1);
					continue;
				case CEXPR_DOMBY:
					s[++sp] = ebitmap_get_bit(&r2->dominates,
								  val1 - 1);
					continue;
				case CEXPR_INCOMP:
					s[++sp] = (!ebitmap_get_bit(&r1->dominates,
								    val2 - 1) &&
						   !ebitmap_get_bit(&r2->dominates,
								    val1 - 1));
					continue;
				default:
					break;
				}
				break;
			case CEXPR_L1L2:
				l1 = &(scontext->range.level[0]);
				l2 = &(tcontext->range.level[0]);
				goto mls_ops;
			case CEXPR_L1H2:
				l1 = &(scontext->range.level[0]);
				l2 = &(tcontext->range.level[1]);
				goto mls_ops;
			case CEXPR_H1L2:
				l1 = &(scontext->range.level[1]);
				l2 = &(tcontext->range.level[0]);
				goto mls_ops;
			case CEXPR_H1H2:
				l1 = &(scontext->range.level[1]);
				l2 = &(tcontext->range.level[1]);
				goto mls_ops;
			case CEXPR_L1H1:
				l1 = &(scontext->range.level[0]);
				l2 = &(scontext->range.level[1]);
				goto mls_ops;
			case CEXPR_L2H2:
				l1 = &(tcontext->range.level[0]);
				l2 = &(tcontext->range.level[1]);
				goto mls_ops;
mls_ops:
			switch (e->op) {
			case CEXPR_EQ:
				s[++sp] = mls_level_eq(l1, l2);
				continue;
			case CEXPR_NEQ:
				s[++sp] = !mls_level_eq(l1, l2);
				continue;
			case CEXPR_DOM:
				s[++sp] = mls_level_dom(l1, l2);
				continue;
			case CEXPR_DOMBY:
				s[++sp] = mls_level_dom(l2, l1);
				continue;
			case CEXPR_INCOMP:
				s[++sp] = mls_level_incomp(l2, l1);
				continue;
			default:
				BUG();
				return 0;
			}
			break;
			default:
				BUG();
				return 0;
			}

			switch (e->op) {
			case CEXPR_EQ:
				s[++sp] = (val1 == val2);
				break;
			case CEXPR_NEQ:
				s[++sp] = (val1 != val2);
				break;
			default:
				BUG();
				return 0;
			}
			break;
		case CEXPR_NAMES:
			if (sp == (CEXPR_MAXDEPTH-1))
				return 0;
			c = scontext;
			if (e->attr & CEXPR_TARGET)
				c = tcontext;
			else if (e->attr & CEXPR_XTARGET) {
				c = xcontext;
				if (!c) {
					BUG();
					return 0;
				}
			}
			if (e->attr & CEXPR_USER)
				val1 = c->user;
			else if (e->attr & CEXPR_ROLE)
				val1 = c->role;
			else if (e->attr & CEXPR_TYPE)
				val1 = c->type;
			else {
				BUG();
				return 0;
			}

			switch (e->op) {
			case CEXPR_EQ:
				s[++sp] = ebitmap_get_bit(&e->names, val1 - 1);
				break;
			case CEXPR_NEQ:
				s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1);
				break;
			default:
				BUG();
				return 0;
			}
			break;
		default:
			BUG();
			return 0;
		}
	}

	BUG_ON(sp != 0);
	return s[0];
}

static int dump_masked_av_helper(void *k, void *d, void *args)
{
	struct perm_datum *pdatum = d;
	char **permission_names = args;

	BUG_ON(pdatum->value < 1 || pdatum->value > 32);

	permission_names[pdatum->value - 1] = (char *)k;

	return 0;
}

static void security_dump_masked_av(struct context *scontext,
				    struct context *tcontext,
				    u16 tclass,
				    u32 permissions,
				    const char *reason)
{
	struct common_datum *common_dat;
	struct class_datum *tclass_dat;
	struct audit_buffer *ab;
	char *tclass_name;
	char *scontext_name = NULL;
	char *tcontext_name = NULL;
	char *permission_names[32];
	int index;
	u32 length;
	bool need_comma = false;

	if (!permissions)
		return;

	tclass_name = sym_name(&policydb, SYM_CLASSES, tclass - 1);
	tclass_dat = policydb.class_val_to_struct[tclass - 1];
	common_dat = tclass_dat->comdatum;

	
	if (common_dat &&
	    hashtab_map(common_dat->permissions.table,
			dump_masked_av_helper, permission_names) < 0)
		goto out;

	if (hashtab_map(tclass_dat->permissions.table,
			dump_masked_av_helper, permission_names) < 0)
		goto out;

	
	if (context_struct_to_string(scontext,
				     &scontext_name, &length) < 0)
		goto out;

	if (context_struct_to_string(tcontext,
				     &tcontext_name, &length) < 0)
		goto out;

	
	ab = audit_log_start(current->audit_context,
			     GFP_ATOMIC, AUDIT_SELINUX_ERR);
	if (!ab)
		goto out;

	audit_log_format(ab, "op=security_compute_av reason=%s "
			 "scontext=%s tcontext=%s tclass=%s perms=",
			 reason, scontext_name, tcontext_name, tclass_name);

	for (index = 0; index < 32; index++) {
		u32 mask = (1 << index);

		if ((mask & permissions) == 0)
			continue;

		audit_log_format(ab, "%s%s",
				 need_comma ? "," : "",
				 permission_names[index]
				 ? permission_names[index] : "????");
		need_comma = true;
	}
	audit_log_end(ab);
out:
	
	kfree(tcontext_name);
	kfree(scontext_name);

	return;
}

static void type_attribute_bounds_av(struct context *scontext,
				     struct context *tcontext,
				     u16 tclass,
				     struct av_decision *avd)
{
	struct context lo_scontext;
	struct context lo_tcontext;
	struct av_decision lo_avd;
	struct type_datum *source;
	struct type_datum *target;
	u32 masked = 0;

	source = flex_array_get_ptr(policydb.type_val_to_struct_array,
				    scontext->type - 1);
	BUG_ON(!source);

	target = flex_array_get_ptr(policydb.type_val_to_struct_array,
				    tcontext->type - 1);
	BUG_ON(!target);

	if (source->bounds) {
		memset(&lo_avd, 0, sizeof(lo_avd));

		memcpy(&lo_scontext, scontext, sizeof(lo_scontext));
		lo_scontext.type = source->bounds;

		context_struct_compute_av(&lo_scontext,
					  tcontext,
					  tclass,
					  &lo_avd);
		if ((lo_avd.allowed & avd->allowed) == avd->allowed)
			return;		
		masked = ~lo_avd.allowed & avd->allowed;
	}

	if (target->bounds) {
		memset(&lo_avd, 0, sizeof(lo_avd));

		memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext));
		lo_tcontext.type = target->bounds;

		context_struct_compute_av(scontext,
					  &lo_tcontext,
					  tclass,
					  &lo_avd);
		if ((lo_avd.allowed & avd->allowed) == avd->allowed)
			return;		
		masked = ~lo_avd.allowed & avd->allowed;
	}

	if (source->bounds && target->bounds) {
		memset(&lo_avd, 0, sizeof(lo_avd));

		context_struct_compute_av(&lo_scontext,
					  &lo_tcontext,
					  tclass,
					  &lo_avd);
		if ((lo_avd.allowed & avd->allowed) == avd->allowed)
			return;		
		masked = ~lo_avd.allowed & avd->allowed;
	}

	if (masked) {
		
		avd->allowed &= ~masked;

		
		security_dump_masked_av(scontext, tcontext,
					tclass, masked, "bounds");
	}
}

static void context_struct_compute_av(struct context *scontext,
				      struct context *tcontext,
				      u16 tclass,
				      struct av_decision *avd)
{
	struct constraint_node *constraint;
	struct role_allow *ra;
	struct avtab_key avkey;
	struct avtab_node *node;
	struct class_datum *tclass_datum;
	struct ebitmap *sattr, *tattr;
	struct ebitmap_node *snode, *tnode;
	unsigned int i, j;

	avd->allowed = 0;
	avd->auditallow = 0;
	avd->auditdeny = 0xffffffff;

	if (unlikely(!tclass || tclass > policydb.p_classes.nprim)) {
		if (printk_ratelimit())
			printk(KERN_WARNING "SELinux:  Invalid class %hu\n", tclass);
		return;
	}

	tclass_datum = policydb.class_val_to_struct[tclass - 1];

	avkey.target_class = tclass;
	avkey.specified = AVTAB_AV;
	sattr = flex_array_get(policydb.type_attr_map_array, scontext->type - 1);
	BUG_ON(!sattr);
	tattr = flex_array_get(policydb.type_attr_map_array, tcontext->type - 1);
	BUG_ON(!tattr);
	ebitmap_for_each_positive_bit(sattr, snode, i) {
		ebitmap_for_each_positive_bit(tattr, tnode, j) {
			avkey.source_type = i + 1;
			avkey.target_type = j + 1;
			for (node = avtab_search_node(&policydb.te_avtab, &avkey);
			     node;
			     node = avtab_search_node_next(node, avkey.specified)) {
				if (node->key.specified == AVTAB_ALLOWED)
					avd->allowed |= node->datum.data;
				else if (node->key.specified == AVTAB_AUDITALLOW)
					avd->auditallow |= node->datum.data;
				else if (node->key.specified == AVTAB_AUDITDENY)
					avd->auditdeny &= node->datum.data;
			}

			
			cond_compute_av(&policydb.te_cond_avtab, &avkey, avd);

		}
	}

	constraint = tclass_datum->constraints;
	while (constraint) {
		if ((constraint->permissions & (avd->allowed)) &&
		    !constraint_expr_eval(scontext, tcontext, NULL,
					  constraint->expr)) {
			avd->allowed &= ~(constraint->permissions);
		}
		constraint = constraint->next;
	}

	if (tclass == policydb.process_class &&
	    (avd->allowed & policydb.process_trans_perms) &&
	    scontext->role != tcontext->role) {
		for (ra = policydb.role_allow; ra; ra = ra->next) {
			if (scontext->role == ra->role &&
			    tcontext->role == ra->new_role)
				break;
		}
		if (!ra)
			avd->allowed &= ~policydb.process_trans_perms;
	}

	type_attribute_bounds_av(scontext, tcontext,
				 tclass, avd);
}

static int security_validtrans_handle_fail(struct context *ocontext,
					   struct context *ncontext,
					   struct context *tcontext,
					   u16 tclass)
{
	char *o = NULL, *n = NULL, *t = NULL;
	u32 olen, nlen, tlen;

	if (context_struct_to_string(ocontext, &o, &olen))
		goto out;
	if (context_struct_to_string(ncontext, &n, &nlen))
		goto out;
	if (context_struct_to_string(tcontext, &t, &tlen))
		goto out;
	audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
		  "security_validate_transition:  denied for"
		  " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
		  o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
out:
	kfree(o);
	kfree(n);
	kfree(t);

	if (!selinux_enforcing)
		return 0;
	return -EPERM;
}

int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
				 u16 orig_tclass)
{
	struct context *ocontext;
	struct context *ncontext;
	struct context *tcontext;
	struct class_datum *tclass_datum;
	struct constraint_node *constraint;
	u16 tclass;
	int rc = 0;

	if (!ss_initialized)
		return 0;

	read_lock(&policy_rwlock);

	tclass = unmap_class(orig_tclass);

	if (!tclass || tclass > policydb.p_classes.nprim) {
		printk(KERN_ERR "SELinux: %s:  unrecognized class %d\n",
			__func__, tclass);
		rc = -EINVAL;
		goto out;
	}
	tclass_datum = policydb.class_val_to_struct[tclass - 1];

	ocontext = sidtab_search(&sidtab, oldsid);
	if (!ocontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
			__func__, oldsid);
		rc = -EINVAL;
		goto out;
	}

	ncontext = sidtab_search(&sidtab, newsid);
	if (!ncontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
			__func__, newsid);
		rc = -EINVAL;
		goto out;
	}

	tcontext = sidtab_search(&sidtab, tasksid);
	if (!tcontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
			__func__, tasksid);
		rc = -EINVAL;
		goto out;
	}

	constraint = tclass_datum->validatetrans;
	while (constraint) {
		if (!constraint_expr_eval(ocontext, ncontext, tcontext,
					  constraint->expr)) {
			rc = security_validtrans_handle_fail(ocontext, ncontext,
							     tcontext, tclass);
			goto out;
		}
		constraint = constraint->next;
	}

out:
	read_unlock(&policy_rwlock);
	return rc;
}

int security_bounded_transition(u32 old_sid, u32 new_sid)
{
	struct context *old_context, *new_context;
	struct type_datum *type;
	int index;
	int rc;

	read_lock(&policy_rwlock);

	rc = -EINVAL;
	old_context = sidtab_search(&sidtab, old_sid);
	if (!old_context) {
		printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
		       __func__, old_sid);
		goto out;
	}

	rc = -EINVAL;
	new_context = sidtab_search(&sidtab, new_sid);
	if (!new_context) {
		printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n",
		       __func__, new_sid);
		goto out;
	}

	rc = 0;
	
	if (old_context->type == new_context->type)
		goto out;

	index = new_context->type;
	while (true) {
		type = flex_array_get_ptr(policydb.type_val_to_struct_array,
					  index - 1);
		BUG_ON(!type);

		
		rc = -EPERM;
		if (!type->bounds)
			break;

		
		rc = 0;
		if (type->bounds == old_context->type)
			break;

		index = type->bounds;
	}

	if (rc) {
		char *old_name = NULL;
		char *new_name = NULL;
		u32 length;

		if (!context_struct_to_string(old_context,
					      &old_name, &length) &&
		    !context_struct_to_string(new_context,
					      &new_name, &length)) {
			audit_log(current->audit_context,
				  GFP_ATOMIC, AUDIT_SELINUX_ERR,
				  "op=security_bounded_transition "
				  "result=denied "
				  "oldcontext=%s newcontext=%s",
				  old_name, new_name);
		}
		kfree(new_name);
		kfree(old_name);
	}
out:
	read_unlock(&policy_rwlock);

	return rc;
}

static void avd_init(struct av_decision *avd)
{
	avd->allowed = 0;
	avd->auditallow = 0;
	avd->auditdeny = 0xffffffff;
	avd->seqno = latest_granting;
	avd->flags = 0;
}


void security_compute_av(u32 ssid,
			 u32 tsid,
			 u16 orig_tclass,
			 struct av_decision *avd)
{
	u16 tclass;
	struct context *scontext = NULL, *tcontext = NULL;

	read_lock(&policy_rwlock);
	avd_init(avd);
	if (!ss_initialized)
		goto allow;

	scontext = sidtab_search(&sidtab, ssid);
	if (!scontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, ssid);
		goto out;
	}

	
	if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
		avd->flags |= AVD_FLAGS_PERMISSIVE;

	tcontext = sidtab_search(&sidtab, tsid);
	if (!tcontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, tsid);
		goto out;
	}

	tclass = unmap_class(orig_tclass);
	if (unlikely(orig_tclass && !tclass)) {
		if (policydb.allow_unknown)
			goto allow;
		goto out;
	}
	context_struct_compute_av(scontext, tcontext, tclass, avd);
	map_decision(orig_tclass, avd, policydb.allow_unknown);
out:
	read_unlock(&policy_rwlock);
	return;
allow:
	avd->allowed = 0xffffffff;
	goto out;
}

void security_compute_av_user(u32 ssid,
			      u32 tsid,
			      u16 tclass,
			      struct av_decision *avd)
{
	struct context *scontext = NULL, *tcontext = NULL;

	read_lock(&policy_rwlock);
	avd_init(avd);
	if (!ss_initialized)
		goto allow;

	scontext = sidtab_search(&sidtab, ssid);
	if (!scontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, ssid);
		goto out;
	}

	
	if (ebitmap_get_bit(&policydb.permissive_map, scontext->type))
		avd->flags |= AVD_FLAGS_PERMISSIVE;

	tcontext = sidtab_search(&sidtab, tsid);
	if (!tcontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, tsid);
		goto out;
	}

	if (unlikely(!tclass)) {
		if (policydb.allow_unknown)
			goto allow;
		goto out;
	}

	context_struct_compute_av(scontext, tcontext, tclass, avd);
 out:
	read_unlock(&policy_rwlock);
	return;
allow:
	avd->allowed = 0xffffffff;
	goto out;
}

static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len)
{
	char *scontextp;

	if (scontext)
		*scontext = NULL;
	*scontext_len = 0;

	if (context->len) {
		*scontext_len = context->len;
		if (scontext) {
			*scontext = kstrdup(context->str, GFP_ATOMIC);
			if (!(*scontext))
				return -ENOMEM;
		}
		return 0;
	}

	
	*scontext_len += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) + 1;
	*scontext_len += strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) + 1;
	*scontext_len += strlen(sym_name(&policydb, SYM_TYPES, context->type - 1)) + 1;
	*scontext_len += mls_compute_context_len(context);

	if (!scontext)
		return 0;

	
	scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
	if (!scontextp)
		return -ENOMEM;
	*scontext = scontextp;

	snprintf(scontextp, *scontext_len, "%s:%s:%s",
		sym_name(&policydb, SYM_USERS, context->user - 1),
		sym_name(&policydb, SYM_ROLES, context->role - 1),
		sym_name(&policydb, SYM_TYPES, context->type - 1));
	scontextp += strlen(sym_name(&policydb, SYM_USERS, context->user - 1)) +
		     1 + strlen(sym_name(&policydb, SYM_ROLES, context->role - 1)) +
		     1 + strlen(sym_name(&policydb, SYM_TYPES, context->type - 1));

	mls_sid_to_context(context, &scontextp);

	*scontextp = 0;

	return 0;
}

#include "initial_sid_to_string.h"

const char *security_get_initial_sid_context(u32 sid)
{
	if (unlikely(sid > SECINITSID_NUM))
		return NULL;
	return initial_sid_to_string[sid];
}

static int security_sid_to_context_core(u32 sid, char **scontext,
					u32 *scontext_len, int force)
{
	struct context *context;
	int rc = 0;

	if (scontext)
		*scontext = NULL;
	*scontext_len  = 0;

	if (!ss_initialized) {
		if (sid <= SECINITSID_NUM) {
			char *scontextp;

			*scontext_len = strlen(initial_sid_to_string[sid]) + 1;
			if (!scontext)
				goto out;
			scontextp = kmalloc(*scontext_len, GFP_ATOMIC);
			if (!scontextp) {
				rc = -ENOMEM;
				goto out;
			}
			strcpy(scontextp, initial_sid_to_string[sid]);
			*scontext = scontextp;
			goto out;
		}
		printk(KERN_ERR "SELinux: %s:  called before initial "
		       "load_policy on unknown SID %d\n", __func__, sid);
		rc = -EINVAL;
		goto out;
	}
	read_lock(&policy_rwlock);
	if (force)
		context = sidtab_search_force(&sidtab, sid);
	else
		context = sidtab_search(&sidtab, sid);
	if (!context) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
			__func__, sid);
		rc = -EINVAL;
		goto out_unlock;
	}
	rc = context_struct_to_string(context, scontext, scontext_len);
out_unlock:
	read_unlock(&policy_rwlock);
out:
	return rc;

}

int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len)
{
	return security_sid_to_context_core(sid, scontext, scontext_len, 0);
}

int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len)
{
	return security_sid_to_context_core(sid, scontext, scontext_len, 1);
}

static int string_to_context_struct(struct policydb *pol,
				    struct sidtab *sidtabp,
				    char *scontext,
				    u32 scontext_len,
				    struct context *ctx,
				    u32 def_sid)
{
	struct role_datum *role;
	struct type_datum *typdatum;
	struct user_datum *usrdatum;
	char *scontextp, *p, oldc;
	int rc = 0;

	context_init(ctx);

	

	rc = -EINVAL;
	scontextp = (char *) scontext;

	
	p = scontextp;
	while (*p && *p != ':')
		p++;

	if (*p == 0)
		goto out;

	*p++ = 0;

	usrdatum = hashtab_search(pol->p_users.table, scontextp);
	if (!usrdatum)
		goto out;

	ctx->user = usrdatum->value;

	
	scontextp = p;
	while (*p && *p != ':')
		p++;

	if (*p == 0)
		goto out;

	*p++ = 0;

	role = hashtab_search(pol->p_roles.table, scontextp);
	if (!role)
		goto out;
	ctx->role = role->value;

	
	scontextp = p;
	while (*p && *p != ':')
		p++;
	oldc = *p;
	*p++ = 0;

	typdatum = hashtab_search(pol->p_types.table, scontextp);
	if (!typdatum || typdatum->attribute)
		goto out;

	ctx->type = typdatum->value;

	rc = mls_context_to_sid(pol, oldc, &p, ctx, sidtabp, def_sid);
	if (rc)
		goto out;

	rc = -EINVAL;
	if ((p - scontext) < scontext_len)
		goto out;

	
	if (!policydb_context_isvalid(pol, ctx))
		goto out;
	rc = 0;
out:
	if (rc)
		context_destroy(ctx);
	return rc;
}

static int security_context_to_sid_core(const char *scontext, u32 scontext_len,
					u32 *sid, u32 def_sid, gfp_t gfp_flags,
					int force)
{
	char *scontext2, *str = NULL;
	struct context context;
	int rc = 0;

	
	if (!scontext_len)
		return -EINVAL;

	if (!ss_initialized) {
		int i;

		for (i = 1; i < SECINITSID_NUM; i++) {
			if (!strcmp(initial_sid_to_string[i], scontext)) {
				*sid = i;
				return 0;
			}
		}
		*sid = SECINITSID_KERNEL;
		return 0;
	}
	*sid = SECSID_NULL;

	
	scontext2 = kmalloc(scontext_len + 1, gfp_flags);
	if (!scontext2)
		return -ENOMEM;
	memcpy(scontext2, scontext, scontext_len);
	scontext2[scontext_len] = 0;

	if (force) {
		
		rc = -ENOMEM;
		str = kstrdup(scontext2, gfp_flags);
		if (!str)
			goto out;
	}

	read_lock(&policy_rwlock);
	rc = string_to_context_struct(&policydb, &sidtab, scontext2,
				      scontext_len, &context, def_sid);
	if (rc == -EINVAL && force) {
		context.str = str;
		context.len = scontext_len;
		str = NULL;
	} else if (rc)
		goto out_unlock;
	rc = sidtab_context_to_sid(&sidtab, &context, sid);
	context_destroy(&context);
out_unlock:
	read_unlock(&policy_rwlock);
out:
	kfree(scontext2);
	kfree(str);
	return rc;
}

int security_context_to_sid(const char *scontext, u32 scontext_len, u32 *sid)
{
	return security_context_to_sid_core(scontext, scontext_len,
					    sid, SECSID_NULL, GFP_KERNEL, 0);
}

int security_context_to_sid_default(const char *scontext, u32 scontext_len,
				    u32 *sid, u32 def_sid, gfp_t gfp_flags)
{
	return security_context_to_sid_core(scontext, scontext_len,
					    sid, def_sid, gfp_flags, 1);
}

int security_context_to_sid_force(const char *scontext, u32 scontext_len,
				  u32 *sid)
{
	return security_context_to_sid_core(scontext, scontext_len,
					    sid, SECSID_NULL, GFP_KERNEL, 1);
}

static int compute_sid_handle_invalid_context(
	struct context *scontext,
	struct context *tcontext,
	u16 tclass,
	struct context *newcontext)
{
	char *s = NULL, *t = NULL, *n = NULL;
	u32 slen, tlen, nlen;

	if (context_struct_to_string(scontext, &s, &slen))
		goto out;
	if (context_struct_to_string(tcontext, &t, &tlen))
		goto out;
	if (context_struct_to_string(newcontext, &n, &nlen))
		goto out;
	audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
		  "security_compute_sid:  invalid context %s"
		  " for scontext=%s"
		  " tcontext=%s"
		  " tclass=%s",
		  n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
out:
	kfree(s);
	kfree(t);
	kfree(n);
	if (!selinux_enforcing)
		return 0;
	return -EACCES;
}

static void filename_compute_type(struct policydb *p, struct context *newcontext,
				  u32 stype, u32 ttype, u16 tclass,
				  const char *objname)
{
	struct filename_trans ft;
	struct filename_trans_datum *otype;

	if (!ebitmap_get_bit(&p->filename_trans_ttypes, ttype))
		return;

	ft.stype = stype;
	ft.ttype = ttype;
	ft.tclass = tclass;
	ft.name = objname;

	otype = hashtab_search(p->filename_trans, &ft);
	if (otype)
		newcontext->type = otype->otype;
}

static int security_compute_sid(u32 ssid,
				u32 tsid,
				u16 orig_tclass,
				u32 specified,
				const char *objname,
				u32 *out_sid,
				bool kern)
{
	struct context *scontext = NULL, *tcontext = NULL, newcontext;
	struct role_trans *roletr = NULL;
	struct avtab_key avkey;
	struct avtab_datum *avdatum;
	struct avtab_node *node;
	u16 tclass;
	int rc = 0;
	bool sock;

	if (!ss_initialized) {
		switch (orig_tclass) {
		case SECCLASS_PROCESS: 
			*out_sid = ssid;
			break;
		default:
			*out_sid = tsid;
			break;
		}
		goto out;
	}

	context_init(&newcontext);

	read_lock(&policy_rwlock);

	if (kern) {
		tclass = unmap_class(orig_tclass);
		sock = security_is_socket_class(orig_tclass);
	} else {
		tclass = orig_tclass;
		sock = security_is_socket_class(map_class(tclass));
	}

	scontext = sidtab_search(&sidtab, ssid);
	if (!scontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, ssid);
		rc = -EINVAL;
		goto out_unlock;
	}
	tcontext = sidtab_search(&sidtab, tsid);
	if (!tcontext) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, tsid);
		rc = -EINVAL;
		goto out_unlock;
	}

	
	switch (specified) {
	case AVTAB_TRANSITION:
	case AVTAB_CHANGE:
		
		newcontext.user = scontext->user;
		break;
	case AVTAB_MEMBER:
		
		newcontext.user = tcontext->user;
		break;
	}

	
	if ((tclass == policydb.process_class) || (sock == true)) {
		
		newcontext.role = scontext->role;
		newcontext.type = scontext->type;
	} else {
		
		newcontext.role = OBJECT_R_VAL;
		
		newcontext.type = tcontext->type;
	}

	
	avkey.source_type = scontext->type;
	avkey.target_type = tcontext->type;
	avkey.target_class = tclass;
	avkey.specified = specified;
	avdatum = avtab_search(&policydb.te_avtab, &avkey);

	
	if (!avdatum) {
		node = avtab_search_node(&policydb.te_cond_avtab, &avkey);
		for (; node; node = avtab_search_node_next(node, specified)) {
			if (node->key.specified & AVTAB_ENABLED) {
				avdatum = &node->datum;
				break;
			}
		}
	}

	if (avdatum) {
		
		newcontext.type = avdatum->data;
	}

	
	if (objname)
		filename_compute_type(&policydb, &newcontext, scontext->type,
				      tcontext->type, tclass, objname);

	
	if (specified & AVTAB_TRANSITION) {
		
		for (roletr = policydb.role_tr; roletr; roletr = roletr->next) {
			if ((roletr->role == scontext->role) &&
			    (roletr->type == tcontext->type) &&
			    (roletr->tclass == tclass)) {
				
				newcontext.role = roletr->new_role;
				break;
			}
		}
	}

	rc = mls_compute_sid(scontext, tcontext, tclass, specified,
			     &newcontext, sock);
	if (rc)
		goto out_unlock;

	
	if (!policydb_context_isvalid(&policydb, &newcontext)) {
		rc = compute_sid_handle_invalid_context(scontext,
							tcontext,
							tclass,
							&newcontext);
		if (rc)
			goto out_unlock;
	}
	
	rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid);
out_unlock:
	read_unlock(&policy_rwlock);
	context_destroy(&newcontext);
out:
	return rc;
}

int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
			    const struct qstr *qstr, u32 *out_sid)
{
	return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
				    qstr ? qstr->name : NULL, out_sid, true);
}

int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
				 const char *objname, u32 *out_sid)
{
	return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,
				    objname, out_sid, false);
}

int security_member_sid(u32 ssid,
			u32 tsid,
			u16 tclass,
			u32 *out_sid)
{
	return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, NULL,
				    out_sid, false);
}

int security_change_sid(u32 ssid,
			u32 tsid,
			u16 tclass,
			u32 *out_sid)
{
	return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, NULL,
				    out_sid, false);
}

static int clone_sid(u32 sid,
		     struct context *context,
		     void *arg)
{
	struct sidtab *s = arg;

	if (sid > SECINITSID_NUM)
		return sidtab_insert(s, sid, context);
	else
		return 0;
}

static inline int convert_context_handle_invalid_context(struct context *context)
{
	char *s;
	u32 len;

	if (selinux_enforcing)
		return -EINVAL;

	if (!context_struct_to_string(context, &s, &len)) {
		printk(KERN_WARNING "SELinux:  Context %s would be invalid if enforcing\n", s);
		kfree(s);
	}
	return 0;
}

struct convert_context_args {
	struct policydb *oldp;
	struct policydb *newp;
};

static int convert_context(u32 key,
			   struct context *c,
			   void *p)
{
	struct convert_context_args *args;
	struct context oldc;
	struct ocontext *oc;
	struct mls_range *range;
	struct role_datum *role;
	struct type_datum *typdatum;
	struct user_datum *usrdatum;
	char *s;
	u32 len;
	int rc = 0;

	if (key <= SECINITSID_NUM)
		goto out;

	args = p;

	if (c->str) {
		struct context ctx;

		rc = -ENOMEM;
		s = kstrdup(c->str, GFP_KERNEL);
		if (!s)
			goto out;

		rc = string_to_context_struct(args->newp, NULL, s,
					      c->len, &ctx, SECSID_NULL);
		kfree(s);
		if (!rc) {
			printk(KERN_INFO "SELinux:  Context %s became valid (mapped).\n",
			       c->str);
			
			kfree(c->str);
			memcpy(c, &ctx, sizeof(*c));
			goto out;
		} else if (rc == -EINVAL) {
			
			rc = 0;
			goto out;
		} else {
			
			printk(KERN_ERR "SELinux:   Unable to map context %s, rc = %d.\n",
			       c->str, -rc);
			goto out;
		}
	}

	rc = context_cpy(&oldc, c);
	if (rc)
		goto out;

	
	rc = -EINVAL;
	usrdatum = hashtab_search(args->newp->p_users.table,
				  sym_name(args->oldp, SYM_USERS, c->user - 1));
	if (!usrdatum)
		goto bad;
	c->user = usrdatum->value;

	
	rc = -EINVAL;
	role = hashtab_search(args->newp->p_roles.table,
			      sym_name(args->oldp, SYM_ROLES, c->role - 1));
	if (!role)
		goto bad;
	c->role = role->value;

	
	rc = -EINVAL;
	typdatum = hashtab_search(args->newp->p_types.table,
				  sym_name(args->oldp, SYM_TYPES, c->type - 1));
	if (!typdatum)
		goto bad;
	c->type = typdatum->value;

	
	if (args->oldp->mls_enabled && args->newp->mls_enabled) {
		rc = mls_convert_context(args->oldp, args->newp, c);
		if (rc)
			goto bad;
	} else if (args->oldp->mls_enabled && !args->newp->mls_enabled) {
		mls_context_destroy(c);
	} else if (!args->oldp->mls_enabled && args->newp->mls_enabled) {
		oc = args->newp->ocontexts[OCON_ISID];
		while (oc && oc->sid[0] != SECINITSID_UNLABELED)
			oc = oc->next;
		rc = -EINVAL;
		if (!oc) {
			printk(KERN_ERR "SELinux:  unable to look up"
				" the initial SIDs list\n");
			goto bad;
		}
		range = &oc->context[0].range;
		rc = mls_range_set(c, range);
		if (rc)
			goto bad;
	}

	
	if (!policydb_context_isvalid(args->newp, c)) {
		rc = convert_context_handle_invalid_context(&oldc);
		if (rc)
			goto bad;
	}

	context_destroy(&oldc);

	rc = 0;
out:
	return rc;
bad:
	
	rc = context_struct_to_string(&oldc, &s, &len);
	if (rc)
		return rc;
	context_destroy(&oldc);
	context_destroy(c);
	c->str = s;
	c->len = len;
	printk(KERN_INFO "SELinux:  Context %s became invalid (unmapped).\n",
	       c->str);
	rc = 0;
	goto out;
}

static void security_load_policycaps(void)
{
	selinux_policycap_netpeer = ebitmap_get_bit(&policydb.policycaps,
						  POLICYDB_CAPABILITY_NETPEER);
	selinux_policycap_openperm = ebitmap_get_bit(&policydb.policycaps,
						  POLICYDB_CAPABILITY_OPENPERM);
}

static int security_preserve_bools(struct policydb *p);

int security_load_policy(void *data, size_t len)
{
	struct policydb oldpolicydb, newpolicydb;
	struct sidtab oldsidtab, newsidtab;
	struct selinux_mapping *oldmap, *map = NULL;
	struct convert_context_args args;
	u32 seqno;
	u16 map_size;
	int rc = 0;
	struct policy_file file = { data, len }, *fp = &file;

	if (!ss_initialized) {
		avtab_cache_init();
		rc = policydb_read(&policydb, fp);
		if (rc) {
			avtab_cache_destroy();
			return rc;
		}

		policydb.len = len;
		rc = selinux_set_mapping(&policydb, secclass_map,
					 &current_mapping,
					 &current_mapping_size);
		if (rc) {
			policydb_destroy(&policydb);
			avtab_cache_destroy();
			return rc;
		}

		rc = policydb_load_isids(&policydb, &sidtab);
		if (rc) {
			policydb_destroy(&policydb);
			avtab_cache_destroy();
			return rc;
		}

		security_load_policycaps();
		ss_initialized = 1;
		seqno = ++latest_granting;
		selinux_complete_init();
		avc_ss_reset(seqno);
		selnl_notify_policyload(seqno);
		selinux_status_update_policyload(seqno);
		selinux_netlbl_cache_invalidate();
		selinux_xfrm_notify_policyload();
		return 0;
	}

#if 0
	sidtab_hash_eval(&sidtab, "sids");
#endif

	rc = policydb_read(&newpolicydb, fp);
	if (rc)
		return rc;

	newpolicydb.len = len;
	
	if (policydb.mls_enabled && !newpolicydb.mls_enabled)
		printk(KERN_INFO "SELinux: Disabling MLS support...\n");
	else if (!policydb.mls_enabled && newpolicydb.mls_enabled)
		printk(KERN_INFO "SELinux: Enabling MLS support...\n");

	rc = policydb_load_isids(&newpolicydb, &newsidtab);
	if (rc) {
		printk(KERN_ERR "SELinux:  unable to load the initial SIDs\n");
		policydb_destroy(&newpolicydb);
		return rc;
	}

	rc = selinux_set_mapping(&newpolicydb, secclass_map, &map, &map_size);
	if (rc)
		goto err;

	rc = security_preserve_bools(&newpolicydb);
	if (rc) {
		printk(KERN_ERR "SELinux:  unable to preserve booleans\n");
		goto err;
	}

	
	sidtab_shutdown(&sidtab);

	rc = sidtab_map(&sidtab, clone_sid, &newsidtab);
	if (rc)
		goto err;

	args.oldp = &policydb;
	args.newp = &newpolicydb;
	rc = sidtab_map(&newsidtab, convert_context, &args);
	if (rc) {
		printk(KERN_ERR "SELinux:  unable to convert the internal"
			" representation of contexts in the new SID"
			" table\n");
		goto err;
	}

	
	memcpy(&oldpolicydb, &policydb, sizeof policydb);
	sidtab_set(&oldsidtab, &sidtab);

	
	write_lock_irq(&policy_rwlock);
	memcpy(&policydb, &newpolicydb, sizeof policydb);
	sidtab_set(&sidtab, &newsidtab);
	security_load_policycaps();
	oldmap = current_mapping;
	current_mapping = map;
	current_mapping_size = map_size;
	seqno = ++latest_granting;
	write_unlock_irq(&policy_rwlock);

	
	policydb_destroy(&oldpolicydb);
	sidtab_destroy(&oldsidtab);
	kfree(oldmap);

	avc_ss_reset(seqno);
	selnl_notify_policyload(seqno);
	selinux_status_update_policyload(seqno);
	selinux_netlbl_cache_invalidate();
	selinux_xfrm_notify_policyload();

	return 0;

err:
	kfree(map);
	sidtab_destroy(&newsidtab);
	policydb_destroy(&newpolicydb);
	return rc;

}

size_t security_policydb_len(void)
{
	size_t len;

	read_lock(&policy_rwlock);
	len = policydb.len;
	read_unlock(&policy_rwlock);

	return len;
}

int security_port_sid(u8 protocol, u16 port, u32 *out_sid)
{
	struct ocontext *c;
	int rc = 0;

	read_lock(&policy_rwlock);

	c = policydb.ocontexts[OCON_PORT];
	while (c) {
		if (c->u.port.protocol == protocol &&
		    c->u.port.low_port <= port &&
		    c->u.port.high_port >= port)
			break;
		c = c->next;
	}

	if (c) {
		if (!c->sid[0]) {
			rc = sidtab_context_to_sid(&sidtab,
						   &c->context[0],
						   &c->sid[0]);
			if (rc)
				goto out;
		}
		*out_sid = c->sid[0];
	} else {
		*out_sid = SECINITSID_PORT;
	}

out:
	read_unlock(&policy_rwlock);
	return rc;
}

int security_netif_sid(char *name, u32 *if_sid)
{
	int rc = 0;
	struct ocontext *c;

	read_lock(&policy_rwlock);

	c = policydb.ocontexts[OCON_NETIF];
	while (c) {
		if (strcmp(name, c->u.name) == 0)
			break;
		c = c->next;
	}

	if (c) {
		if (!c->sid[0] || !c->sid[1]) {
			rc = sidtab_context_to_sid(&sidtab,
						  &c->context[0],
						  &c->sid[0]);
			if (rc)
				goto out;
			rc = sidtab_context_to_sid(&sidtab,
						   &c->context[1],
						   &c->sid[1]);
			if (rc)
				goto out;
		}
		*if_sid = c->sid[0];
	} else
		*if_sid = SECINITSID_NETIF;

out:
	read_unlock(&policy_rwlock);
	return rc;
}

static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask)
{
	int i, fail = 0;

	for (i = 0; i < 4; i++)
		if (addr[i] != (input[i] & mask[i])) {
			fail = 1;
			break;
		}

	return !fail;
}

int security_node_sid(u16 domain,
		      void *addrp,
		      u32 addrlen,
		      u32 *out_sid)
{
	int rc;
	struct ocontext *c;

	read_lock(&policy_rwlock);

	switch (domain) {
	case AF_INET: {
		u32 addr;

		rc = -EINVAL;
		if (addrlen != sizeof(u32))
			goto out;

		addr = *((u32 *)addrp);

		c = policydb.ocontexts[OCON_NODE];
		while (c) {
			if (c->u.node.addr == (addr & c->u.node.mask))
				break;
			c = c->next;
		}
		break;
	}

	case AF_INET6:
		rc = -EINVAL;
		if (addrlen != sizeof(u64) * 2)
			goto out;
		c = policydb.ocontexts[OCON_NODE6];
		while (c) {
			if (match_ipv6_addrmask(addrp, c->u.node6.addr,
						c->u.node6.mask))
				break;
			c = c->next;
		}
		break;

	default:
		rc = 0;
		*out_sid = SECINITSID_NODE;
		goto out;
	}

	if (c) {
		if (!c->sid[0]) {
			rc = sidtab_context_to_sid(&sidtab,
						   &c->context[0],
						   &c->sid[0]);
			if (rc)
				goto out;
		}
		*out_sid = c->sid[0];
	} else {
		*out_sid = SECINITSID_NODE;
	}

	rc = 0;
out:
	read_unlock(&policy_rwlock);
	return rc;
}

#define SIDS_NEL 25


int security_get_user_sids(u32 fromsid,
			   char *username,
			   u32 **sids,
			   u32 *nel)
{
	struct context *fromcon, usercon;
	u32 *mysids = NULL, *mysids2, sid;
	u32 mynel = 0, maxnel = SIDS_NEL;
	struct user_datum *user;
	struct role_datum *role;
	struct ebitmap_node *rnode, *tnode;
	int rc = 0, i, j;

	*sids = NULL;
	*nel = 0;

	if (!ss_initialized)
		goto out;

	read_lock(&policy_rwlock);

	context_init(&usercon);

	rc = -EINVAL;
	fromcon = sidtab_search(&sidtab, fromsid);
	if (!fromcon)
		goto out_unlock;

	rc = -EINVAL;
	user = hashtab_search(policydb.p_users.table, username);
	if (!user)
		goto out_unlock;

	usercon.user = user->value;

	rc = -ENOMEM;
	mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC);
	if (!mysids)
		goto out_unlock;

	ebitmap_for_each_positive_bit(&user->roles, rnode, i) {
		role = policydb.role_val_to_struct[i];
		usercon.role = i + 1;
		ebitmap_for_each_positive_bit(&role->types, tnode, j) {
			usercon.type = j + 1;

			if (mls_setup_user_range(fromcon, user, &usercon))
				continue;

			rc = sidtab_context_to_sid(&sidtab, &usercon, &sid);
			if (rc)
				goto out_unlock;
			if (mynel < maxnel) {
				mysids[mynel++] = sid;
			} else {
				rc = -ENOMEM;
				maxnel += SIDS_NEL;
				mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC);
				if (!mysids2)
					goto out_unlock;
				memcpy(mysids2, mysids, mynel * sizeof(*mysids2));
				kfree(mysids);
				mysids = mysids2;
				mysids[mynel++] = sid;
			}
		}
	}
	rc = 0;
out_unlock:
	read_unlock(&policy_rwlock);
	if (rc || !mynel) {
		kfree(mysids);
		goto out;
	}

	rc = -ENOMEM;
	mysids2 = kcalloc(mynel, sizeof(*mysids2), GFP_KERNEL);
	if (!mysids2) {
		kfree(mysids);
		goto out;
	}
	for (i = 0, j = 0; i < mynel; i++) {
		struct av_decision dummy_avd;
		rc = avc_has_perm_noaudit(fromsid, mysids[i],
					  SECCLASS_PROCESS, 
					  PROCESS__TRANSITION, AVC_STRICT,
					  &dummy_avd);
		if (!rc)
			mysids2[j++] = mysids[i];
		cond_resched();
	}
	rc = 0;
	kfree(mysids);
	*sids = mysids2;
	*nel = j;
out:
	return rc;
}

int security_genfs_sid(const char *fstype,
		       char *path,
		       u16 orig_sclass,
		       u32 *sid)
{
	int len;
	u16 sclass;
	struct genfs *genfs;
	struct ocontext *c;
	int rc, cmp = 0;

	while (path[0] == '/' && path[1] == '/')
		path++;

	read_lock(&policy_rwlock);

	sclass = unmap_class(orig_sclass);
	*sid = SECINITSID_UNLABELED;

	for (genfs = policydb.genfs; genfs; genfs = genfs->next) {
		cmp = strcmp(fstype, genfs->fstype);
		if (cmp <= 0)
			break;
	}

	rc = -ENOENT;
	if (!genfs || cmp)
		goto out;

	for (c = genfs->head; c; c = c->next) {
		len = strlen(c->u.name);
		if ((!c->v.sclass || sclass == c->v.sclass) &&
		    (strncmp(c->u.name, path, len) == 0))
			break;
	}

	rc = -ENOENT;
	if (!c)
		goto out;

	if (!c->sid[0]) {
		rc = sidtab_context_to_sid(&sidtab, &c->context[0], &c->sid[0]);
		if (rc)
			goto out;
	}

	*sid = c->sid[0];
	rc = 0;
out:
	read_unlock(&policy_rwlock);
	return rc;
}

int security_fs_use(
	const char *fstype,
	unsigned int *behavior,
	u32 *sid)
{
	int rc = 0;
	struct ocontext *c;

	read_lock(&policy_rwlock);

	c = policydb.ocontexts[OCON_FSUSE];
	while (c) {
		if (strcmp(fstype, c->u.name) == 0)
			break;
		c = c->next;
	}

	if (c) {
		*behavior = c->v.behavior;
		if (!c->sid[0]) {
			rc = sidtab_context_to_sid(&sidtab, &c->context[0],
						   &c->sid[0]);
			if (rc)
				goto out;
		}
		*sid = c->sid[0];
	} else {
		rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid);
		if (rc) {
			*behavior = SECURITY_FS_USE_NONE;
			rc = 0;
		} else {
			*behavior = SECURITY_FS_USE_GENFS;
		}
	}

out:
	read_unlock(&policy_rwlock);
	return rc;
}

int security_get_bools(int *len, char ***names, int **values)
{
	int i, rc;

	read_lock(&policy_rwlock);
	*names = NULL;
	*values = NULL;

	rc = 0;
	*len = policydb.p_bools.nprim;
	if (!*len)
		goto out;

	rc = -ENOMEM;
	*names = kcalloc(*len, sizeof(char *), GFP_ATOMIC);
	if (!*names)
		goto err;

	rc = -ENOMEM;
	*values = kcalloc(*len, sizeof(int), GFP_ATOMIC);
	if (!*values)
		goto err;

	for (i = 0; i < *len; i++) {
		size_t name_len;

		(*values)[i] = policydb.bool_val_to_struct[i]->state;
		name_len = strlen(sym_name(&policydb, SYM_BOOLS, i)) + 1;

		rc = -ENOMEM;
		(*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC);
		if (!(*names)[i])
			goto err;

		strncpy((*names)[i], sym_name(&policydb, SYM_BOOLS, i), name_len);
		(*names)[i][name_len - 1] = 0;
	}
	rc = 0;
out:
	read_unlock(&policy_rwlock);
	return rc;
err:
	if (*names) {
		for (i = 0; i < *len; i++)
			kfree((*names)[i]);
	}
	kfree(*values);
	goto out;
}


int security_set_bools(int len, int *values)
{
	int i, rc;
	int lenp, seqno = 0;
	struct cond_node *cur;

	write_lock_irq(&policy_rwlock);

	rc = -EFAULT;
	lenp = policydb.p_bools.nprim;
	if (len != lenp)
		goto out;

	for (i = 0; i < len; i++) {
		if (!!values[i] != policydb.bool_val_to_struct[i]->state) {
			audit_log(current->audit_context, GFP_ATOMIC,
				AUDIT_MAC_CONFIG_CHANGE,
				"bool=%s val=%d old_val=%d auid=%u ses=%u",
				sym_name(&policydb, SYM_BOOLS, i),
				!!values[i],
				policydb.bool_val_to_struct[i]->state,
				audit_get_loginuid(current),
				audit_get_sessionid(current));
		}
		if (values[i])
			policydb.bool_val_to_struct[i]->state = 1;
		else
			policydb.bool_val_to_struct[i]->state = 0;
	}

	for (cur = policydb.cond_list; cur; cur = cur->next) {
		rc = evaluate_cond_node(&policydb, cur);
		if (rc)
			goto out;
	}

	seqno = ++latest_granting;
	rc = 0;
out:
	write_unlock_irq(&policy_rwlock);
	if (!rc) {
		avc_ss_reset(seqno);
		selnl_notify_policyload(seqno);
		selinux_status_update_policyload(seqno);
		selinux_xfrm_notify_policyload();
	}
	return rc;
}

int security_get_bool_value(int bool)
{
	int rc;
	int len;

	read_lock(&policy_rwlock);

	rc = -EFAULT;
	len = policydb.p_bools.nprim;
	if (bool >= len)
		goto out;

	rc = policydb.bool_val_to_struct[bool]->state;
out:
	read_unlock(&policy_rwlock);
	return rc;
}

static int security_preserve_bools(struct policydb *p)
{
	int rc, nbools = 0, *bvalues = NULL, i;
	char **bnames = NULL;
	struct cond_bool_datum *booldatum;
	struct cond_node *cur;

	rc = security_get_bools(&nbools, &bnames, &bvalues);
	if (rc)
		goto out;
	for (i = 0; i < nbools; i++) {
		booldatum = hashtab_search(p->p_bools.table, bnames[i]);
		if (booldatum)
			booldatum->state = bvalues[i];
	}
	for (cur = p->cond_list; cur; cur = cur->next) {
		rc = evaluate_cond_node(p, cur);
		if (rc)
			goto out;
	}

out:
	if (bnames) {
		for (i = 0; i < nbools; i++)
			kfree(bnames[i]);
	}
	kfree(bnames);
	kfree(bvalues);
	return rc;
}

int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
{
	struct context *context1;
	struct context *context2;
	struct context newcon;
	char *s;
	u32 len;
	int rc;

	rc = 0;
	if (!ss_initialized || !policydb.mls_enabled) {
		*new_sid = sid;
		goto out;
	}

	context_init(&newcon);

	read_lock(&policy_rwlock);

	rc = -EINVAL;
	context1 = sidtab_search(&sidtab, sid);
	if (!context1) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
			__func__, sid);
		goto out_unlock;
	}

	rc = -EINVAL;
	context2 = sidtab_search(&sidtab, mls_sid);
	if (!context2) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
			__func__, mls_sid);
		goto out_unlock;
	}

	newcon.user = context1->user;
	newcon.role = context1->role;
	newcon.type = context1->type;
	rc = mls_context_cpy(&newcon, context2);
	if (rc)
		goto out_unlock;

	
	if (!policydb_context_isvalid(&policydb, &newcon)) {
		rc = convert_context_handle_invalid_context(&newcon);
		if (rc) {
			if (!context_struct_to_string(&newcon, &s, &len)) {
				audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
					  "security_sid_mls_copy: invalid context %s", s);
				kfree(s);
			}
			goto out_unlock;
		}
	}

	rc = sidtab_context_to_sid(&sidtab, &newcon, new_sid);
out_unlock:
	read_unlock(&policy_rwlock);
	context_destroy(&newcon);
out:
	return rc;
}

int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
				 u32 xfrm_sid,
				 u32 *peer_sid)
{
	int rc;
	struct context *nlbl_ctx;
	struct context *xfrm_ctx;

	*peer_sid = SECSID_NULL;

	if (xfrm_sid == SECSID_NULL) {
		*peer_sid = nlbl_sid;
		return 0;
	}
	if (nlbl_sid == SECSID_NULL || nlbl_type == NETLBL_NLTYPE_UNLABELED) {
		*peer_sid = xfrm_sid;
		return 0;
	}

	if (!policydb.mls_enabled)
		return 0;

	read_lock(&policy_rwlock);

	rc = -EINVAL;
	nlbl_ctx = sidtab_search(&sidtab, nlbl_sid);
	if (!nlbl_ctx) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, nlbl_sid);
		goto out;
	}
	rc = -EINVAL;
	xfrm_ctx = sidtab_search(&sidtab, xfrm_sid);
	if (!xfrm_ctx) {
		printk(KERN_ERR "SELinux: %s:  unrecognized SID %d\n",
		       __func__, xfrm_sid);
		goto out;
	}
	rc = (mls_context_cmp(nlbl_ctx, xfrm_ctx) ? 0 : -EACCES);
	if (rc)
		goto out;

	*peer_sid = xfrm_sid;
out:
	read_unlock(&policy_rwlock);
	return rc;
}

static int get_classes_callback(void *k, void *d, void *args)
{
	struct class_datum *datum = d;
	char *name = k, **classes = args;
	int value = datum->value - 1;

	classes[value] = kstrdup(n…