Commit 6b6bc620 authored by Stephen Smalley's avatar Stephen Smalley Committed by Paul Moore
Browse files

selinux: wrap AVC state 



Wrap the AVC state within the selinux_state structure and
pass it explicitly to all AVC functions.  The AVC private state
is encapsulated in a selinux_avc structure that is referenced
from the selinux_state.

This change should have no effect on SELinux behavior or
APIs (userspace or LSM).

Signed-off-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Reviewed-by: default avatarJames Morris <james.morris@microsoft.com>
Signed-off-by: default avatarPaul Moore <paul@paul-moore.com>
parent 0619f0f5

security/selinux/avc.c

+162 −122
Original line number Diff line number Diff line
@@ -82,14 +82,42 @@ struct avc_callback_node { 
	struct avc_callback_node *next;

};



/* Exported via selinufs */

unsigned int avc_cache_threshold = AVC_DEF_CACHE_THRESHOLD;



#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS

DEFINE_PER_CPU(struct avc_cache_stats, avc_cache_stats) = { 0 };

#endif



static struct avc_cache avc_cache;

struct selinux_avc {

	unsigned int avc_cache_threshold;

	struct avc_cache avc_cache;

};



static struct selinux_avc selinux_avc;



void selinux_avc_init(struct selinux_avc **avc)

{

	int i;



	selinux_avc.avc_cache_threshold = AVC_DEF_CACHE_THRESHOLD;

	for (i = 0; i < AVC_CACHE_SLOTS; i++) {

		INIT_HLIST_HEAD(&selinux_avc.avc_cache.slots[i]);

		spin_lock_init(&selinux_avc.avc_cache.slots_lock[i]);

	}

	atomic_set(&selinux_avc.avc_cache.active_nodes, 0);

	atomic_set(&selinux_avc.avc_cache.lru_hint, 0);

	*avc = &selinux_avc;

}



unsigned int avc_get_cache_threshold(struct selinux_avc *avc)

{

	return avc->avc_cache_threshold;

}



void avc_set_cache_threshold(struct selinux_avc *avc,

			     unsigned int cache_threshold)

{

	avc->avc_cache_threshold = cache_threshold;

}



static struct avc_callback_node *avc_callbacks;

static struct kmem_cache *avc_node_cachep;

static struct kmem_cache *avc_xperms_data_cachep;
@@ -143,14 +171,14 @@ static void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av) 
 * @tsid: target security identifier

 * @tclass: target security class

 */

static void avc_dump_query(struct audit_buffer *ab, u32 ssid, u32 tsid, u16 tclass)

static void avc_dump_query(struct audit_buffer *ab, struct selinux_state *state,

			   u32 ssid, u32 tsid, u16 tclass)

{

	int rc;

	char *scontext;

	u32 scontext_len;



	rc = security_sid_to_context(&selinux_state, ssid,

				     &scontext, &scontext_len);

	rc = security_sid_to_context(state, ssid, &scontext, &scontext_len);

	if (rc)

		audit_log_format(ab, "ssid=%d", ssid);

	else {
@@ -158,8 +186,7 @@ static void avc_dump_query(struct audit_buffer *ab, u32 ssid, u32 tsid, u16 tcla 
		kfree(scontext);

	}



	rc = security_sid_to_context(&selinux_state, tsid,

				     &scontext, &scontext_len);

	rc = security_sid_to_context(state, tsid, &scontext, &scontext_len);

	if (rc)

		audit_log_format(ab, " tsid=%d", tsid);

	else {
@@ -178,15 +205,6 @@ static void avc_dump_query(struct audit_buffer *ab, u32 ssid, u32 tsid, u16 tcla 
 */

void __init avc_init(void)

{

	int i;



	for (i = 0; i < AVC_CACHE_SLOTS; i++) {

		INIT_HLIST_HEAD(&avc_cache.slots[i]);

		spin_lock_init(&avc_cache.slots_lock[i]);

	}

	atomic_set(&avc_cache.active_nodes, 0);

	atomic_set(&avc_cache.lru_hint, 0);



	avc_node_cachep = kmem_cache_create("avc_node", sizeof(struct avc_node),

					0, SLAB_PANIC, NULL);

	avc_xperms_cachep = kmem_cache_create("avc_xperms_node",
@@ -201,7 +219,7 @@ void __init avc_init(void) 
					0, SLAB_PANIC, NULL);

}



int avc_get_hash_stats(char *page)

int avc_get_hash_stats(struct selinux_avc *avc, char *page)

{

	int i, chain_len, max_chain_len, slots_used;

	struct avc_node *node;
@@ -212,7 +230,7 @@ int avc_get_hash_stats(char *page) 
	slots_used = 0;

	max_chain_len = 0;

	for (i = 0; i < AVC_CACHE_SLOTS; i++) {

		head = &avc_cache.slots[i];

		head = &avc->avc_cache.slots[i];

		if (!hlist_empty(head)) {

			slots_used++;

			chain_len = 0;
@@ -227,7 +245,7 @@ int avc_get_hash_stats(char *page) 


	return scnprintf(page, PAGE_SIZE, "entries: %d\nbuckets used: %d/%d\n"

			 "longest chain: %d\n",

			 atomic_read(&avc_cache.active_nodes),

			 atomic_read(&avc->avc_cache.active_nodes),

			 slots_used, AVC_CACHE_SLOTS, max_chain_len);

}
@@ -464,7 +482,8 @@ static inline u32 avc_xperms_audit_required(u32 requested, 
	return audited;

}



static inline int avc_xperms_audit(u32 ssid, u32 tsid, u16 tclass,

static inline int avc_xperms_audit(struct selinux_state *state,

				   u32 ssid, u32 tsid, u16 tclass,

				   u32 requested, struct av_decision *avd,

				   struct extended_perms_decision *xpd,

				   u8 perm, int result,
@@ -476,7 +495,7 @@ static inline int avc_xperms_audit(u32 ssid, u32 tsid, u16 tclass, 
			requested, avd, xpd, perm, result, &denied);

	if (likely(!audited))

		return 0;

	return slow_avc_audit(ssid, tsid, tclass, requested,

	return slow_avc_audit(state, ssid, tsid, tclass, requested,

			audited, denied, result, ad, 0);

}
@@ -488,29 +507,30 @@ static void avc_node_free(struct rcu_head *rhead) 
	avc_cache_stats_incr(frees);

}



static void avc_node_delete(struct avc_node *node)

static void avc_node_delete(struct selinux_avc *avc, struct avc_node *node)

{

	hlist_del_rcu(&node->list);

	call_rcu(&node->rhead, avc_node_free);

	atomic_dec(&avc_cache.active_nodes);

	atomic_dec(&avc->avc_cache.active_nodes);

}



static void avc_node_kill(struct avc_node *node)

static void avc_node_kill(struct selinux_avc *avc, struct avc_node *node)

{

	avc_xperms_free(node->ae.xp_node);

	kmem_cache_free(avc_node_cachep, node);

	avc_cache_stats_incr(frees);

	atomic_dec(&avc_cache.active_nodes);

	atomic_dec(&avc->avc_cache.active_nodes);

}



static void avc_node_replace(struct avc_node *new, struct avc_node *old)

static void avc_node_replace(struct selinux_avc *avc,

			     struct avc_node *new, struct avc_node *old)

{

	hlist_replace_rcu(&old->list, &new->list);

	call_rcu(&old->rhead, avc_node_free);

	atomic_dec(&avc_cache.active_nodes);

	atomic_dec(&avc->avc_cache.active_nodes);

}



static inline int avc_reclaim_node(void)

static inline int avc_reclaim_node(struct selinux_avc *avc)

{

	struct avc_node *node;

	int hvalue, try, ecx;
@@ -519,16 +539,17 @@ static inline int avc_reclaim_node(void) 
	spinlock_t *lock;



	for (try = 0, ecx = 0; try < AVC_CACHE_SLOTS; try++) {

		hvalue = atomic_inc_return(&avc_cache.lru_hint) & (AVC_CACHE_SLOTS - 1);

		head = &avc_cache.slots[hvalue];

		lock = &avc_cache.slots_lock[hvalue];

		hvalue = atomic_inc_return(&avc->avc_cache.lru_hint) &

			(AVC_CACHE_SLOTS - 1);

		head = &avc->avc_cache.slots[hvalue];

		lock = &avc->avc_cache.slots_lock[hvalue];



		if (!spin_trylock_irqsave(lock, flags))

			continue;



		rcu_read_lock();

		hlist_for_each_entry(node, head, list) {

			avc_node_delete(node);

			avc_node_delete(avc, node);

			avc_cache_stats_incr(reclaims);

			ecx++;

			if (ecx >= AVC_CACHE_RECLAIM) {
@@ -544,7 +565,7 @@ out: 
	return ecx;

}



static struct avc_node *avc_alloc_node(void)

static struct avc_node *avc_alloc_node(struct selinux_avc *avc)

{

	struct avc_node *node;
@@ -555,8 +576,9 @@ static struct avc_node *avc_alloc_node(void) 
	INIT_HLIST_NODE(&node->list);

	avc_cache_stats_incr(allocations);



	if (atomic_inc_return(&avc_cache.active_nodes) > avc_cache_threshold)

		avc_reclaim_node();

	if (atomic_inc_return(&avc->avc_cache.active_nodes) >

	    avc->avc_cache_threshold)

		avc_reclaim_node(avc);



out:

	return node;
@@ -570,14 +592,15 @@ static void avc_node_populate(struct avc_node *node, u32 ssid, u32 tsid, u16 tcl 
	memcpy(&node->ae.avd, avd, sizeof(node->ae.avd));

}



static inline struct avc_node *avc_search_node(u32 ssid, u32 tsid, u16 tclass)

static inline struct avc_node *avc_search_node(struct selinux_avc *avc,

					       u32 ssid, u32 tsid, u16 tclass)

{

	struct avc_node *node, *ret = NULL;

	int hvalue;

	struct hlist_head *head;



	hvalue = avc_hash(ssid, tsid, tclass);

	head = &avc_cache.slots[hvalue];

	head = &avc->avc_cache.slots[hvalue];

	hlist_for_each_entry_rcu(node, head, list) {

		if (ssid == node->ae.ssid &&

		    tclass == node->ae.tclass &&
@@ -602,12 +625,13 @@ static inline struct avc_node *avc_search_node(u32 ssid, u32 tsid, u16 tclass) 
 * then this function returns the avc_node.

 * Otherwise, this function returns NULL.

 */

static struct avc_node *avc_lookup(u32 ssid, u32 tsid, u16 tclass)

static struct avc_node *avc_lookup(struct selinux_avc *avc,

				   u32 ssid, u32 tsid, u16 tclass)

{

	struct avc_node *node;



	avc_cache_stats_incr(lookups);

	node = avc_search_node(ssid, tsid, tclass);

	node = avc_search_node(avc, ssid, tsid, tclass);



	if (node)

		return node;
@@ -616,7 +640,8 @@ static struct avc_node *avc_lookup(u32 ssid, u32 tsid, u16 tclass) 
	return NULL;

}



static int avc_latest_notif_update(int seqno, int is_insert)

static int avc_latest_notif_update(struct selinux_avc *avc,

				   int seqno, int is_insert)

{

	int ret = 0;

	static DEFINE_SPINLOCK(notif_lock);
@@ -624,14 +649,14 @@ static int avc_latest_notif_update(int seqno, int is_insert) 


	spin_lock_irqsave(&notif_lock, flag);

	if (is_insert) {

		if (seqno < avc_cache.latest_notif) {

		if (seqno < avc->avc_cache.latest_notif) {

			printk(KERN_WARNING "SELinux: avc:  seqno %d < latest_notif %d\n",

			       seqno, avc_cache.latest_notif);

			       seqno, avc->avc_cache.latest_notif);

			ret = -EAGAIN;

		}

	} else {

		if (seqno > avc_cache.latest_notif)

			avc_cache.latest_notif = seqno;

		if (seqno > avc->avc_cache.latest_notif)

			avc->avc_cache.latest_notif = seqno;

	}

	spin_unlock_irqrestore(&notif_lock, flag);
@@ -656,7 +681,8 @@ static int avc_latest_notif_update(int seqno, int is_insert) 
 * the access vectors into a cache entry, returns

 * avc_node inserted. Otherwise, this function returns NULL.

 */

static struct avc_node *avc_insert(u32 ssid, u32 tsid, u16 tclass,

static struct avc_node *avc_insert(struct selinux_avc *avc,

				   u32 ssid, u32 tsid, u16 tclass,

				   struct av_decision *avd,

				   struct avc_xperms_node *xp_node)

{
@@ -664,10 +690,10 @@ static struct avc_node *avc_insert(u32 ssid, u32 tsid, u16 tclass, 
	int hvalue;

	unsigned long flag;



	if (avc_latest_notif_update(avd->seqno, 1))

	if (avc_latest_notif_update(avc, avd->seqno, 1))

		goto out;



	node = avc_alloc_node();

	node = avc_alloc_node(avc);

	if (node) {

		struct hlist_head *head;

		spinlock_t *lock;
@@ -680,15 +706,15 @@ static struct avc_node *avc_insert(u32 ssid, u32 tsid, u16 tclass, 
			kmem_cache_free(avc_node_cachep, node);

			return NULL;

		}

		head = &avc_cache.slots[hvalue];

		lock = &avc_cache.slots_lock[hvalue];

		head = &avc->avc_cache.slots[hvalue];

		lock = &avc->avc_cache.slots_lock[hvalue];



		spin_lock_irqsave(lock, flag);

		hlist_for_each_entry(pos, head, list) {

			if (pos->ae.ssid == ssid &&

			    pos->ae.tsid == tsid &&

			    pos->ae.tclass == tclass) {

				avc_node_replace(node, pos);

				avc_node_replace(avc, node, pos);

				goto found;

			}

		}
@@ -726,7 +752,8 @@ static void avc_audit_post_callback(struct audit_buffer *ab, void *a) 
{

	struct common_audit_data *ad = a;

	audit_log_format(ab, " ");

	avc_dump_query(ab, ad->selinux_audit_data->ssid,

	avc_dump_query(ab, ad->selinux_audit_data->state,

		       ad->selinux_audit_data->ssid,

		       ad->selinux_audit_data->tsid,

		       ad->selinux_audit_data->tclass);

	if (ad->selinux_audit_data->denied) {
@@ -736,10 +763,11 @@ static void avc_audit_post_callback(struct audit_buffer *ab, void *a) 
}



/* This is the slow part of avc audit with big stack footprint */

noinline int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,

noinline int slow_avc_audit(struct selinux_state *state,

			    u32 ssid, u32 tsid, u16 tclass,

			    u32 requested, u32 audited, u32 denied, int result,

			    struct common_audit_data *a,

		unsigned flags)

			    unsigned int flags)

{

	struct common_audit_data stack_data;

	struct selinux_audit_data sad;
@@ -767,6 +795,7 @@ noinline int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass, 
	sad.audited = audited;

	sad.denied = denied;

	sad.result = result;

	sad.state = state;



	a->selinux_audit_data = &sad;
@@ -815,7 +844,8 @@ out: 
 * otherwise, this function updates the AVC entry. The original AVC-entry object

 * will release later by RCU.

 */

static int avc_update_node(u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid,

static int avc_update_node(struct selinux_avc *avc,

			   u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid,

			   u32 tsid, u16 tclass, u32 seqno,

			   struct extended_perms_decision *xpd,

			   u32 flags)
@@ -826,7 +856,7 @@ static int avc_update_node(u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid, 
	struct hlist_head *head;

	spinlock_t *lock;



	node = avc_alloc_node();

	node = avc_alloc_node(avc);

	if (!node) {

		rc = -ENOMEM;

		goto out;
@@ -835,8 +865,8 @@ static int avc_update_node(u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid, 
	/* Lock the target slot */

	hvalue = avc_hash(ssid, tsid, tclass);



	head = &avc_cache.slots[hvalue];

	lock = &avc_cache.slots_lock[hvalue];

	head = &avc->avc_cache.slots[hvalue];

	lock = &avc->avc_cache.slots_lock[hvalue];



	spin_lock_irqsave(lock, flag);
@@ -852,7 +882,7 @@ static int avc_update_node(u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid, 


	if (!orig) {

		rc = -ENOENT;

		avc_node_kill(node);

		avc_node_kill(avc, node);

		goto out_unlock;

	}
@@ -896,7 +926,7 @@ static int avc_update_node(u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid, 
		avc_add_xperms_decision(node, xpd);

		break;

	}

	avc_node_replace(node, orig);

	avc_node_replace(avc, node, orig);

out_unlock:

	spin_unlock_irqrestore(lock, flag);

out:
@@ -906,7 +936,7 @@ out: 
/**

 * avc_flush - Flush the cache

 */

static void avc_flush(void)

static void avc_flush(struct selinux_avc *avc)

{

	struct hlist_head *head;

	struct avc_node *node;
@@ -915,8 +945,8 @@ static void avc_flush(void) 
	int i;



	for (i = 0; i < AVC_CACHE_SLOTS; i++) {

		head = &avc_cache.slots[i];

		lock = &avc_cache.slots_lock[i];

		head = &avc->avc_cache.slots[i];

		lock = &avc->avc_cache.slots_lock[i];



		spin_lock_irqsave(lock, flag);

		/*
@@ -925,7 +955,7 @@ static void avc_flush(void) 
		 */

		rcu_read_lock();

		hlist_for_each_entry(node, head, list)

			avc_node_delete(node);

			avc_node_delete(avc, node);

		rcu_read_unlock();

		spin_unlock_irqrestore(lock, flag);

	}
@@ -935,12 +965,12 @@ static void avc_flush(void) 
 * avc_ss_reset - Flush the cache and revalidate migrated permissions.

 * @seqno: policy sequence number

 */

int avc_ss_reset(u32 seqno)

int avc_ss_reset(struct selinux_avc *avc, u32 seqno)

{

	struct avc_callback_node *c;

	int rc = 0, tmprc;



	avc_flush();

	avc_flush(avc);



	for (c = avc_callbacks; c; c = c->next) {

		if (c->events & AVC_CALLBACK_RESET) {
@@ -952,7 +982,7 @@ int avc_ss_reset(u32 seqno) 
		}

	}



	avc_latest_notif_update(seqno, 0);

	avc_latest_notif_update(avc, seqno, 0);

	return rc;

}
@@ -965,32 +995,34 @@ int avc_ss_reset(u32 seqno) 
 * Don't inline this, since it's the slow-path and just

 * results in a bigger stack frame.

 */

static noinline struct avc_node *avc_compute_av(u32 ssid, u32 tsid,

static noinline

struct avc_node *avc_compute_av(struct selinux_state *state,

				u32 ssid, u32 tsid,

				u16 tclass, struct av_decision *avd,

				struct avc_xperms_node *xp_node)

{

	rcu_read_unlock();

	INIT_LIST_HEAD(&xp_node->xpd_head);

	security_compute_av(&selinux_state, ssid, tsid, tclass,

			    avd, &xp_node->xp);

	security_compute_av(state, ssid, tsid, tclass, avd, &xp_node->xp);

	rcu_read_lock();

	return avc_insert(ssid, tsid, tclass, avd, xp_node);

	return avc_insert(state->avc, ssid, tsid, tclass, avd, xp_node);

}



static noinline int avc_denied(u32 ssid, u32 tsid,

static noinline int avc_denied(struct selinux_state *state,

			       u32 ssid, u32 tsid,

			       u16 tclass, u32 requested,

				u8 driver, u8 xperm, unsigned flags,

			       u8 driver, u8 xperm, unsigned int flags,

			       struct av_decision *avd)

{

	if (flags & AVC_STRICT)

		return -EACCES;



	if (enforcing_enabled(&selinux_state) &&

	if (enforcing_enabled(state) &&

	    !(avd->flags & AVD_FLAGS_PERMISSIVE))

		return -EACCES;



	avc_update_node(AVC_CALLBACK_GRANT, requested, driver, xperm, ssid,

				tsid, tclass, avd->seqno, NULL, flags);

	avc_update_node(state->avc, AVC_CALLBACK_GRANT, requested, driver,

			xperm, ssid, tsid, tclass, avd->seqno, NULL, flags);

	return 0;

}
@@ -1001,7 +1033,8 @@ static noinline int avc_denied(u32 ssid, u32 tsid, 
 * as-is the case with ioctls, then multiple may be chained together and the

 * driver field is used to specify which set contains the permission.

 */

int avc_has_extended_perms(u32 ssid, u32 tsid, u16 tclass, u32 requested,

int avc_has_extended_perms(struct selinux_state *state,

			   u32 ssid, u32 tsid, u16 tclass, u32 requested,

			   u8 driver, u8 xperm, struct common_audit_data *ad)

{

	struct avc_node *node;
@@ -1021,9 +1054,9 @@ int avc_has_extended_perms(u32 ssid, u32 tsid, u16 tclass, u32 requested, 


	rcu_read_lock();



	node = avc_lookup(ssid, tsid, tclass);

	node = avc_lookup(state->avc, ssid, tsid, tclass);

	if (unlikely(!node)) {

		node = avc_compute_av(ssid, tsid, tclass, &avd, xp_node);

		node = avc_compute_av(state, ssid, tsid, tclass, &avd, xp_node);

	} else {

		memcpy(&avd, &node->ae.avd, sizeof(avd));

		xp_node = node->ae.xp_node;
@@ -1047,11 +1080,12 @@ int avc_has_extended_perms(u32 ssid, u32 tsid, u16 tclass, u32 requested, 
			goto decision;

		}

		rcu_read_unlock();

		security_compute_xperms_decision(&selinux_state, ssid, tsid,

						 tclass, driver, &local_xpd);

		security_compute_xperms_decision(state, ssid, tsid, tclass,

						 driver, &local_xpd);

		rcu_read_lock();

		avc_update_node(AVC_CALLBACK_ADD_XPERMS, requested, driver, xperm,

				ssid, tsid, tclass, avd.seqno, &local_xpd, 0);

		avc_update_node(state->avc, AVC_CALLBACK_ADD_XPERMS, requested,

				driver, xperm, ssid, tsid, tclass, avd.seqno,

				&local_xpd, 0);

	} else {

		avc_quick_copy_xperms_decision(xperm, &local_xpd, xpd);

	}
@@ -1063,12 +1097,12 @@ int avc_has_extended_perms(u32 ssid, u32 tsid, u16 tclass, u32 requested, 
decision:

	denied = requested & ~(avd.allowed);

	if (unlikely(denied))

		rc = avc_denied(ssid, tsid, tclass, requested, driver, xperm,

				AVC_EXTENDED_PERMS, &avd);

		rc = avc_denied(state, ssid, tsid, tclass, requested,

				driver, xperm, AVC_EXTENDED_PERMS, &avd);



	rcu_read_unlock();



	rc2 = avc_xperms_audit(ssid, tsid, tclass, requested,

	rc2 = avc_xperms_audit(state, ssid, tsid, tclass, requested,

			&avd, xpd, xperm, rc, ad);

	if (rc2)

		return rc2;
@@ -1095,9 +1129,10 @@ decision: 
 * auditing, e.g. in cases where a lock must be held for the check but

 * should be released for the auditing.

 */

inline int avc_has_perm_noaudit(u32 ssid, u32 tsid,

inline int avc_has_perm_noaudit(struct selinux_state *state,

				u32 ssid, u32 tsid,

				u16 tclass, u32 requested,

			 unsigned flags,

				unsigned int flags,

				struct av_decision *avd)

{

	struct avc_node *node;
@@ -1109,15 +1144,16 @@ inline int avc_has_perm_noaudit(u32 ssid, u32 tsid, 


	rcu_read_lock();



	node = avc_lookup(ssid, tsid, tclass);

	node = avc_lookup(state->avc, ssid, tsid, tclass);

	if (unlikely(!node))

		node = avc_compute_av(ssid, tsid, tclass, avd, &xp_node);

		node = avc_compute_av(state, ssid, tsid, tclass, avd, &xp_node);

	else

		memcpy(avd, &node->ae.avd, sizeof(*avd));



	denied = requested & ~(avd->allowed);

	if (unlikely(denied))

		rc = avc_denied(ssid, tsid, tclass, requested, 0, 0, flags, avd);

		rc = avc_denied(state, ssid, tsid, tclass, requested, 0, 0,

				flags, avd);



	rcu_read_unlock();

	return rc;
@@ -1139,39 +1175,43 @@ inline int avc_has_perm_noaudit(u32 ssid, u32 tsid, 
 * permissions are granted, -%EACCES if any permissions are denied, or

 * another -errno upon other errors.

 */

int avc_has_perm(u32 ssid, u32 tsid, u16 tclass,

int avc_has_perm(struct selinux_state *state, u32 ssid, u32 tsid, u16 tclass,

		 u32 requested, struct common_audit_data *auditdata)

{

	struct av_decision avd;

	int rc, rc2;



	rc = avc_has_perm_noaudit(ssid, tsid, tclass, requested, 0, &avd);

	rc = avc_has_perm_noaudit(state, ssid, tsid, tclass, requested, 0,

				  &avd);



	rc2 = avc_audit(ssid, tsid, tclass, requested, &avd, rc, auditdata, 0);

	rc2 = avc_audit(state, ssid, tsid, tclass, requested, &avd, rc,

			auditdata, 0);

	if (rc2)

		return rc2;

	return rc;

}



int avc_has_perm_flags(u32 ssid, u32 tsid, u16 tclass,

		       u32 requested, struct common_audit_data *auditdata,

int avc_has_perm_flags(struct selinux_state *state,

		       u32 ssid, u32 tsid, u16 tclass, u32 requested,

		       struct common_audit_data *auditdata,

		       int flags)

{

	struct av_decision avd;

	int rc, rc2;



	rc = avc_has_perm_noaudit(ssid, tsid, tclass, requested, 0, &avd);

	rc = avc_has_perm_noaudit(state, ssid, tsid, tclass, requested, 0,

				  &avd);



	rc2 = avc_audit(ssid, tsid, tclass, requested, &avd, rc,

	rc2 = avc_audit(state, ssid, tsid, tclass, requested, &avd, rc,

			auditdata, flags);

	if (rc2)

		return rc2;

	return rc;

}



u32 avc_policy_seqno(void)

u32 avc_policy_seqno(struct selinux_state *state)

{

	return avc_cache.latest_notif;

	return state->avc->avc_cache.latest_notif;

}



void avc_disable(void)
@@ -1188,7 +1228,7 @@ void avc_disable(void) 
	 * the cache and get that memory back.

	 */

	if (avc_node_cachep) {

		avc_flush();

		avc_flush(selinux_state.avc);

		/* kmem_cache_destroy(avc_node_cachep); */

	}

}

security/selinux/hooks.c

+265 −133

File changed.

Preview size limit exceeded, changes collapsed.

security/selinux/include/avc.h

+21 −11
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ struct selinux_audit_data { 
	u32 audited;

	u32 denied;

	int result;

	struct selinux_state *state;

};



/*
@@ -96,7 +97,8 @@ static inline u32 avc_audit_required(u32 requested, 
	return audited;

}



int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,

int slow_avc_audit(struct selinux_state *state,

		   u32 ssid, u32 tsid, u16 tclass,

		   u32 requested, u32 audited, u32 denied, int result,

		   struct common_audit_data *a,

		   unsigned flags);
@@ -121,7 +123,8 @@ int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass, 
 * be performed under a lock, to allow the lock to be released

 * before calling the auditing code.

 */

static inline int avc_audit(u32 ssid, u32 tsid,

static inline int avc_audit(struct selinux_state *state,

			    u32 ssid, u32 tsid,

			    u16 tclass, u32 requested,

			    struct av_decision *avd,

			    int result,
@@ -132,31 +135,35 @@ static inline int avc_audit(u32 ssid, u32 tsid, 
	audited = avc_audit_required(requested, avd, result, 0, &denied);

	if (likely(!audited))

		return 0;

	return slow_avc_audit(ssid, tsid, tclass,

	return slow_avc_audit(state, ssid, tsid, tclass,

			      requested, audited, denied, result,

			      a, flags);

}



#define AVC_STRICT 1 /* Ignore permissive mode. */

#define AVC_EXTENDED_PERMS 2	/* update extended permissions */

int avc_has_perm_noaudit(u32 ssid, u32 tsid,

int avc_has_perm_noaudit(struct selinux_state *state,

			 u32 ssid, u32 tsid,

			 u16 tclass, u32 requested,

			 unsigned flags,

			 struct av_decision *avd);



int avc_has_perm(u32 ssid, u32 tsid,

int avc_has_perm(struct selinux_state *state,

		 u32 ssid, u32 tsid,

		 u16 tclass, u32 requested,

		 struct common_audit_data *auditdata);

int avc_has_perm_flags(u32 ssid, u32 tsid,

int avc_has_perm_flags(struct selinux_state *state,

		       u32 ssid, u32 tsid,

		       u16 tclass, u32 requested,

		       struct common_audit_data *auditdata,

		       int flags);



int avc_has_extended_perms(u32 ssid, u32 tsid, u16 tclass, u32 requested,

int avc_has_extended_perms(struct selinux_state *state,

			   u32 ssid, u32 tsid, u16 tclass, u32 requested,

			   u8 driver, u8 perm, struct common_audit_data *ad);





u32 avc_policy_seqno(void);

u32 avc_policy_seqno(struct selinux_state *state);



#define AVC_CALLBACK_GRANT		1

#define AVC_CALLBACK_TRY_REVOKE		2
@@ -171,8 +178,11 @@ u32 avc_policy_seqno(void); 
int avc_add_callback(int (*callback)(u32 event), u32 events);



/* Exported to selinuxfs */

int avc_get_hash_stats(char *page);

extern unsigned int avc_cache_threshold;

struct selinux_avc;

int avc_get_hash_stats(struct selinux_avc *avc, char *page);

unsigned int avc_get_cache_threshold(struct selinux_avc *avc);

void avc_set_cache_threshold(struct selinux_avc *avc,

			     unsigned int cache_threshold);



/* Attempt to free avc node cache */

void avc_disable(void);

security/selinux/include/avc_ss.h

+2 −1
Original line number Diff line number Diff line
@@ -9,7 +9,8 @@ 


#include "flask.h"



int avc_ss_reset(u32 seqno);

struct selinux_avc;

int avc_ss_reset(struct selinux_avc *avc, u32 seqno);



/* Class/perm mapping support */

struct security_class_mapping {

security/selinux/include/security.h

+3 −0
Original line number Diff line number Diff line
@@ -93,6 +93,7 @@ extern char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX]; 
/* limitation of boundary depth  */

#define POLICYDB_BOUNDS_MAXDEPTH	4



struct selinux_avc;

struct selinux_ss;



struct selinux_state {
@@ -103,10 +104,12 @@ struct selinux_state { 
	bool checkreqprot;

	bool initialized;

	bool policycap[__POLICYDB_CAPABILITY_MAX];

	struct selinux_avc *avc;

	struct selinux_ss *ss;

};



void selinux_ss_init(struct selinux_ss **ss);

void selinux_avc_init(struct selinux_avc **avc);



extern struct selinux_state selinux_state;

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