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Merge branch 'smack-for-4.11' of git://github.com/cschaufler/smack-next into next

This commit is contained in:
James Morris 2017-01-27 09:23:21 +11:00
parent c659af78eb 83a1e53f39
commit 710584b9da
3 changed files with 95 additions and 27 deletions
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3
security/smack/smack.h
View File

@ -114,6 +114,7 @@ struct inode_smack {
struct smack_known *smk_mmap; /* label of the mmap domain */
struct mutex smk_lock; /* initialization lock */
int smk_flags; /* smack inode flags */
struct rcu_head smk_rcu; /* for freeing inode_smack */
};
struct task_smack {
@ -173,6 +174,8 @@ struct smk_port_label {
unsigned short smk_port; /* the port number */
struct smack_known *smk_in; /* inbound label */
struct smack_known *smk_out; /* outgoing label */
short smk_sock_type; /* Socket type */
short smk_can_reuse;
};
#endif /* SMACK_IPV6_PORT_LABELING */

114
security/smack/smack_lsm.c
View File

@ -52,6 +52,7 @@
#define SMK_SENDING 2
#ifdef SMACK_IPV6_PORT_LABELING
DEFINE_MUTEX(smack_ipv6_lock);
static LIST_HEAD(smk_ipv6_port_list);
#endif
static struct kmem_cache *smack_inode_cache;
@ -347,8 +348,6 @@ static int smk_copy_rules(struct list_head *nhead, struct list_head *ohead,
struct smack_rule *orp;
int rc = 0;
INIT_LIST_HEAD(nhead);
list_for_each_entry_rcu(orp, ohead, list) {
nrp = kzalloc(sizeof(struct smack_rule), gfp);
if (nrp == NULL) {
@ -375,8 +374,6 @@ static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
struct smack_known_list_elem *nklep;
struct smack_known_list_elem *oklep;
INIT_LIST_HEAD(nhead);
list_for_each_entry(oklep, ohead, list) {
nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
if (nklep == NULL) {
@ -1009,15 +1006,39 @@ static int smack_inode_alloc_security(struct inode *inode)
}
/**
* smack_inode_free_security - free an inode blob
* smack_inode_free_rcu - Free inode_smack blob from cache
* @head: the rcu_head for getting inode_smack pointer
*
* Call back function called from call_rcu() to free
* the i_security blob pointer in inode
*/
static void smack_inode_free_rcu(struct rcu_head *head)
{
struct inode_smack *issp;
issp = container_of(head, struct inode_smack, smk_rcu);
kmem_cache_free(smack_inode_cache, issp);
}
/**
* smack_inode_free_security - free an inode blob using call_rcu()
* @inode: the inode with a blob
*
* Clears the blob pointer in inode
* Clears the blob pointer in inode using RCU
*/
static void smack_inode_free_security(struct inode *inode)
{
kmem_cache_free(smack_inode_cache, inode->i_security);
inode->i_security = NULL;
struct inode_smack *issp = inode->i_security;
/*
* The inode may still be referenced in a path walk and
* a call to smack_inode_permission() can be made
* after smack_inode_free_security() is called.
* To avoid race condition free the i_security via RCU
* and leave the current inode->i_security pointer intact.
* The inode will be freed after the RCU grace period too.
*/
call_rcu(&issp->smk_rcu, smack_inode_free_rcu);
}
/**
@ -1626,6 +1647,9 @@ static int smack_file_ioctl(struct file *file, unsigned int cmd,
struct smk_audit_info ad;
struct inode *inode = file_inode(file);
if (unlikely(IS_PRIVATE(inode)))
return 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
@ -1655,6 +1679,9 @@ static int smack_file_lock(struct file *file, unsigned int cmd)
int rc;
struct inode *inode = file_inode(file);
if (unlikely(IS_PRIVATE(inode)))
return 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
@ -1681,6 +1708,9 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
int rc = 0;
struct inode *inode = file_inode(file);
if (unlikely(IS_PRIVATE(inode)))
return 0;
switch (cmd) {
case F_GETLK:
break;
@ -1734,6 +1764,9 @@ static int smack_mmap_file(struct file *file,
if (file == NULL)
return 0;
if (unlikely(IS_PRIVATE(file_inode(file))))
return 0;
isp = file_inode(file)->i_security;
if (isp->smk_mmap == NULL)
return 0;
@ -1934,12 +1967,9 @@ static int smack_file_open(struct file *file, const struct cred *cred)
struct smk_audit_info ad;
int rc;
if (smack_privileged(CAP_MAC_OVERRIDE))
return 0;
smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
smk_ad_setfield_u_fs_path(&ad, file->f_path);
rc = smk_access(tsp->smk_task, smk_of_inode(inode), MAY_READ, &ad);
rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
rc = smk_bu_credfile(cred, file, MAY_READ, rc);
return rc;
@ -2353,6 +2383,20 @@ static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
*/
static void smack_sk_free_security(struct sock *sk)
{
#ifdef SMACK_IPV6_PORT_LABELING
struct smk_port_label *spp;
if (sk->sk_family == PF_INET6) {
rcu_read_lock();
list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
if (spp->smk_sock != sk)
continue;
spp->smk_can_reuse = 1;
break;
}
rcu_read_unlock();
}
#endif
kfree(sk->sk_security);
}
@ -2603,17 +2647,20 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
* on the bound socket. Take the changes to the port
* as well.
*/
list_for_each_entry(spp, &smk_ipv6_port_list, list) {
rcu_read_lock();
list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
if (sk != spp->smk_sock)
continue;
spp->smk_in = ssp->smk_in;
spp->smk_out = ssp->smk_out;
rcu_read_unlock();
return;
}
/*
* A NULL address is only used for updating existing
* bound entries. If there isn't one, it's OK.
*/
rcu_read_unlock();
return;
}
@ -2629,16 +2676,23 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
* Look for an existing port list entry.
* This is an indication that a port is getting reused.
*/
list_for_each_entry(spp, &smk_ipv6_port_list, list) {
if (spp->smk_port != port)
rcu_read_lock();
list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
if (spp->smk_port != port || spp->smk_sock_type != sock->type)
continue;
if (spp->smk_can_reuse != 1) {
rcu_read_unlock();
return;
}
spp->smk_port = port;
spp->smk_sock = sk;
spp->smk_in = ssp->smk_in;
spp->smk_out = ssp->smk_out;
spp->smk_can_reuse = 0;
rcu_read_unlock();
return;
}
rcu_read_unlock();
/*
* A new port entry is required.
*/
@ -2650,8 +2704,12 @@ static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
spp->smk_sock = sk;
spp->smk_in = ssp->smk_in;
spp->smk_out = ssp->smk_out;
spp->smk_sock_type = sock->type;
spp->smk_can_reuse = 0;
list_add(&spp->list, &smk_ipv6_port_list);
mutex_lock(&smack_ipv6_lock);
list_add_rcu(&spp->list, &smk_ipv6_port_list);
mutex_unlock(&smack_ipv6_lock);
return;
}
@ -2702,14 +2760,16 @@ static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
return 0;
port = ntohs(address->sin6_port);
list_for_each_entry(spp, &smk_ipv6_port_list, list) {
if (spp->smk_port != port)
rcu_read_lock();
list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
continue;
object = spp->smk_in;
if (act == SMK_CONNECTING)
ssp->smk_packet = spp->smk_out;
break;
}
rcu_read_unlock();
return smk_ipv6_check(skp, object, address, act);
}
@ -3438,6 +3498,13 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
case PIPEFS_MAGIC:
isp->smk_inode = smk_of_current();
break;
case SOCKFS_MAGIC:
/*
* Socket access is controlled by the socket
* structures associated with the task involved.
*/
isp->smk_inode = &smack_known_star;
break;
default:
isp->smk_inode = sbsp->smk_root;
break;
@ -3454,19 +3521,12 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
switch (sbp->s_magic) {
case SMACK_MAGIC:
case PIPEFS_MAGIC:
case SOCKFS_MAGIC:
case CGROUP_SUPER_MAGIC:
/*
* Casey says that it's a little embarrassing
* that the smack file system doesn't do
* extended attributes.
*
* Casey says pipes are easy (?)
*
* Socket access is controlled by the socket
* structures associated with the task involved.
*
* Cgroupfs is special
*/
final = &smack_known_star;
@ -3849,7 +3909,7 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
* ambient value.
*/
rcu_read_lock();
list_for_each_entry(skp, &smack_known_list, list) {
list_for_each_entry_rcu(skp, &smack_known_list, list) {
if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
continue;
/*

5
security/smack/smackfs.c
View File

@ -67,6 +67,7 @@ enum smk_inos {
/*
* List locks
*/
static DEFINE_MUTEX(smack_master_list_lock);
static DEFINE_MUTEX(smack_cipso_lock);
static DEFINE_MUTEX(smack_ambient_lock);
static DEFINE_MUTEX(smk_net4addr_lock);
@ -262,12 +263,16 @@ static int smk_set_access(struct smack_parsed_rule *srp,
* it needs to get added for reporting.
*/
if (global) {
mutex_unlock(rule_lock);
smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
if (smlp != NULL) {
smlp->smk_rule = sp;
mutex_lock(&smack_master_list_lock);
list_add_rcu(&smlp->list, &smack_rule_list);
mutex_unlock(&smack_master_list_lock);
} else
rc = -ENOMEM;
return rc;
}
}