[linux-2.6-block.git] / security / lsm_audit.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * common LSM auditing functions
 *
 * Based on code written for SELinux by :
 *			Stephen Smalley, <sds@tycho.nsa.gov>
 * 			James Morris <jmorris@redhat.com>
 * Author : Etienne Basset, <etienne.basset@ensta.org>
 */

#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <net/sock.h>
#include <linux/un.h>
#include <net/af_unix.h>
#include <linux/audit.h>
#include <linux/ipv6.h>
#include <linux/ip.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/dccp.h>
#include <linux/sctp.h>
#include <linux/lsm_audit.h>

/**
 * ipv4_skb_to_auditdata : fill auditdata from skb
 * @skb : the skb
 * @ad : the audit data to fill
 * @proto : the layer 4 protocol
 *
 * return  0 on success
 */
int ipv4_skb_to_auditdata(struct sk_buff *skb,
		struct common_audit_data *ad, u8 *proto)
{
	int ret = 0;
	struct iphdr *ih;

	ih = ip_hdr(skb);
	if (ih == NULL)
		return -EINVAL;

	ad->u.net->v4info.saddr = ih->saddr;
	ad->u.net->v4info.daddr = ih->daddr;

	if (proto)
		*proto = ih->protocol;
	/* non initial fragment */
	if (ntohs(ih->frag_off) & IP_OFFSET)
		return 0;

	switch (ih->protocol) {
	case IPPROTO_TCP: {
		struct tcphdr *th = tcp_hdr(skb);
		if (th == NULL)
			break;

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}
	case IPPROTO_UDP: {
		struct udphdr *uh = udp_hdr(skb);
		if (uh == NULL)
			break;

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}
	case IPPROTO_DCCP: {
		struct dccp_hdr *dh = dccp_hdr(skb);
		if (dh == NULL)
			break;

		ad->u.net->sport = dh->dccph_sport;
		ad->u.net->dport = dh->dccph_dport;
		break;
	}
	case IPPROTO_SCTP: {
		struct sctphdr *sh = sctp_hdr(skb);
		if (sh == NULL)
			break;
		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
	default:
		ret = -EINVAL;
	}
	return ret;
}
#if IS_ENABLED(CONFIG_IPV6)
/**
 * ipv6_skb_to_auditdata : fill auditdata from skb
 * @skb : the skb
 * @ad : the audit data to fill
 * @proto : the layer 4 protocol
 *
 * return  0 on success
 */
int ipv6_skb_to_auditdata(struct sk_buff *skb,
		struct common_audit_data *ad, u8 *proto)
{
	int offset, ret = 0;
	struct ipv6hdr *ip6;
	u8 nexthdr;
	__be16 frag_off;

	ip6 = ipv6_hdr(skb);
	if (ip6 == NULL)
		return -EINVAL;
	ad->u.net->v6info.saddr = ip6->saddr;
	ad->u.net->v6info.daddr = ip6->daddr;
	ret = 0;
	/* IPv6 can have several extension header before the Transport header
	 * skip them */
	offset = skb_network_offset(skb);
	offset += sizeof(*ip6);
	nexthdr = ip6->nexthdr;
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	if (offset < 0)
		return 0;
	if (proto)
		*proto = nexthdr;
	switch (nexthdr) {
	case IPPROTO_TCP: {
		struct tcphdr _tcph, *th;

		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th == NULL)
			break;

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}
	case IPPROTO_UDP: {
		struct udphdr _udph, *uh;

		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh == NULL)
			break;

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}
	case IPPROTO_DCCP: {
		struct dccp_hdr _dccph, *dh;

		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh == NULL)
			break;

		ad->u.net->sport = dh->dccph_sport;
		ad->u.net->dport = dh->dccph_dport;
		break;
	}
	case IPPROTO_SCTP: {
		struct sctphdr _sctph, *sh;

		sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
		if (sh == NULL)
			break;
		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
	default:
		ret = -EINVAL;
	}
	return ret;
}
#endif


static inline void print_ipv6_addr(struct audit_buffer *ab,
				   struct in6_addr *addr, __be16 port,
				   char *name1, char *name2)
{
	if (!ipv6_addr_any(addr))
		audit_log_format(ab, " %s=%pI6c", name1, addr);
	if (port)
		audit_log_format(ab, " %s=%d", name2, ntohs(port));
}

static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
				   __be16 port, char *name1, char *name2)
{
	if (addr)
		audit_log_format(ab, " %s=%pI4", name1, &addr);
	if (port)
		audit_log_format(ab, " %s=%d", name2, ntohs(port));
}

/**
 * dump_common_audit_data - helper to dump common audit data
 * @a : common audit data
 *
 */
static void dump_common_audit_data(struct audit_buffer *ab,
				   struct common_audit_data *a)
{
	char comm[sizeof(current->comm)];

	/*
	 * To keep stack sizes in check force programers to notice if they
	 * start making this union too large!  See struct lsm_network_audit
	 * as an example of how to deal with large data.
	 */
	BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);

	audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
	audit_log_untrustedstring(ab, memcpy(comm, current->comm, sizeof(comm)));

	switch (a->type) {
	case LSM_AUDIT_DATA_NONE:
		return;
	case LSM_AUDIT_DATA_IPC:
		audit_log_format(ab, " key=%d ", a->u.ipc_id);
		break;
	case LSM_AUDIT_DATA_CAP:
		audit_log_format(ab, " capability=%d ", a->u.cap);
		break;
	case LSM_AUDIT_DATA_PATH: {
		struct inode *inode;

		audit_log_d_path(ab, " path=", &a->u.path);

		inode = d_backing_inode(a->u.path.dentry);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_FILE: {
		struct inode *inode;

		audit_log_d_path(ab, " path=", &a->u.file->f_path);

		inode = file_inode(a->u.file);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_IOCTL_OP: {
		struct inode *inode;

		audit_log_d_path(ab, " path=", &a->u.op->path);

		inode = a->u.op->path.dentry->d_inode;
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}

		audit_log_format(ab, " ioctlcmd=0x%hx", a->u.op->cmd);
		break;
	}
	case LSM_AUDIT_DATA_DENTRY: {
		struct inode *inode;

		audit_log_format(ab, " name=");
		audit_log_untrustedstring(ab, a->u.dentry->d_name.name);

		inode = d_backing_inode(a->u.dentry);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_INODE: {
		struct dentry *dentry;
		struct inode *inode;

		inode = a->u.inode;
		dentry = d_find_alias(inode);
		if (dentry) {
			audit_log_format(ab, " name=");
			audit_log_untrustedstring(ab,
					 dentry->d_name.name);
			dput(dentry);
		}
		audit_log_format(ab, " dev=");
		audit_log_untrustedstring(ab, inode->i_sb->s_id);
		audit_log_format(ab, " ino=%lu", inode->i_ino);
		break;
	}
	case LSM_AUDIT_DATA_TASK: {
		struct task_struct *tsk = a->u.tsk;
		if (tsk) {
			pid_t pid = task_tgid_nr(tsk);
			if (pid) {
				char comm[sizeof(tsk->comm)];
				audit_log_format(ab, " opid=%d ocomm=", pid);
				audit_log_untrustedstring(ab,
				    memcpy(comm, tsk->comm, sizeof(comm)));
			}
		}
		break;
	}
	case LSM_AUDIT_DATA_NET:
		if (a->u.net->sk) {
			struct sock *sk = a->u.net->sk;
			struct unix_sock *u;
			struct unix_address *addr;
			int len = 0;
			char *p = NULL;

			switch (sk->sk_family) {
			case AF_INET: {
				struct inet_sock *inet = inet_sk(sk);

				print_ipv4_addr(ab, inet->inet_rcv_saddr,
						inet->inet_sport,
						"laddr", "lport");
				print_ipv4_addr(ab, inet->inet_daddr,
						inet->inet_dport,
						"faddr", "fport");
				break;
			}
#if IS_ENABLED(CONFIG_IPV6)
			case AF_INET6: {
				struct inet_sock *inet = inet_sk(sk);

				print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
						inet->inet_sport,
						"laddr", "lport");
				print_ipv6_addr(ab, &sk->sk_v6_daddr,
						inet->inet_dport,
						"faddr", "fport");
				break;
			}
#endif
			case AF_UNIX:
				u = unix_sk(sk);
				addr = smp_load_acquire(&u->addr);
				if (!addr)
					break;
				if (u->path.dentry) {
					audit_log_d_path(ab, " path=", &u->path);
					break;
				}
				len = addr->len-sizeof(short);
				p = &addr->name->sun_path[0];
				audit_log_format(ab, " path=");
				if (*p)
					audit_log_untrustedstring(ab, p);
				else
					audit_log_n_hex(ab, p, len);
				break;
			}
		}

		switch (a->u.net->family) {
		case AF_INET:
			print_ipv4_addr(ab, a->u.net->v4info.saddr,
					a->u.net->sport,
					"saddr", "src");
			print_ipv4_addr(ab, a->u.net->v4info.daddr,
					a->u.net->dport,
					"daddr", "dest");
			break;
		case AF_INET6:
			print_ipv6_addr(ab, &a->u.net->v6info.saddr,
					a->u.net->sport,
					"saddr", "src");
			print_ipv6_addr(ab, &a->u.net->v6info.daddr,
					a->u.net->dport,
					"daddr", "dest");
			break;
		}
		if (a->u.net->netif > 0) {
			struct net_device *dev;

			/* NOTE: we always use init's namespace */
			dev = dev_get_by_index(&init_net, a->u.net->netif);
			if (dev) {
				audit_log_format(ab, " netif=%s", dev->name);
				dev_put(dev);
			}
		}
		break;
#ifdef CONFIG_KEYS
	case LSM_AUDIT_DATA_KEY:
		audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
		if (a->u.key_struct.key_desc) {
			audit_log_format(ab, " key_desc=");
			audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
		}
		break;
#endif
	case LSM_AUDIT_DATA_KMOD:
		audit_log_format(ab, " kmod=");
		audit_log_untrustedstring(ab, a->u.kmod_name);
		break;
	case LSM_AUDIT_DATA_IBPKEY: {
		struct in6_addr sbn_pfx;

		memset(&sbn_pfx.s6_addr, 0,
		       sizeof(sbn_pfx.s6_addr));
		memcpy(&sbn_pfx.s6_addr, &a->u.ibpkey->subnet_prefix,
		       sizeof(a->u.ibpkey->subnet_prefix));
		audit_log_format(ab, " pkey=0x%x subnet_prefix=%pI6c",
				 a->u.ibpkey->pkey, &sbn_pfx);
		break;
	}
	case LSM_AUDIT_DATA_IBENDPORT:
		audit_log_format(ab, " device=%s port_num=%u",
				 a->u.ibendport->dev_name,
				 a->u.ibendport->port);
		break;
	} /* switch (a->type) */
}

/**
 * common_lsm_audit - generic LSM auditing function
 * @a:  auxiliary audit data
 * @pre_audit: lsm-specific pre-audit callback
 * @post_audit: lsm-specific post-audit callback
 *
 * setup the audit buffer for common security information
 * uses callback to print LSM specific information
 */
void common_lsm_audit(struct common_audit_data *a,
	void (*pre_audit)(struct audit_buffer *, void *),
	void (*post_audit)(struct audit_buffer *, void *))
{
	struct audit_buffer *ab;

	if (a == NULL)
		return;
	/* we use GFP_ATOMIC so we won't sleep */
	ab = audit_log_start(audit_context(), GFP_ATOMIC | __GFP_NOWARN,
			     AUDIT_AVC);

	if (ab == NULL)
		return;

	if (pre_audit)
		pre_audit(ab, a);

	dump_common_audit_data(ab, a);

	if (post_audit)
		post_audit(ab, a);

	audit_log_end(ab);
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* common LSM auditing functions
	4	*
	5	* Based on code written for SELinux by :
	6	* Stephen Smalley, <sds@tycho.nsa.gov>
	7	* James Morris <jmorris@redhat.com>
	8	* Author : Etienne Basset, <etienne.basset@ensta.org>
	9	*/
	10
	11	#include <linux/types.h>
	12	#include <linux/stddef.h>
	13	#include <linux/kernel.h>
	14	#include <linux/gfp.h>
	15	#include <linux/fs.h>
	16	#include <linux/init.h>
	17	#include <net/sock.h>
	18	#include <linux/un.h>
	19	#include <net/af_unix.h>
	20	#include <linux/audit.h>
	21	#include <linux/ipv6.h>
	22	#include <linux/ip.h>
	23	#include <net/ip.h>
	24	#include <net/ipv6.h>
	25	#include <linux/tcp.h>
	26	#include <linux/udp.h>
	27	#include <linux/dccp.h>
	28	#include <linux/sctp.h>
	29	#include <linux/lsm_audit.h>
	30
	31	/**
	32	* ipv4_skb_to_auditdata : fill auditdata from skb
	33	* @skb : the skb
	34	* @ad : the audit data to fill
	35	* @proto : the layer 4 protocol
	36	*
	37	* return 0 on success
	38	*/
	39	int ipv4_skb_to_auditdata(struct sk_buff *skb,
	40	struct common_audit_data ad, u8 proto)
	41	{
	42	int ret = 0;
	43	struct iphdr *ih;
	44
	45	ih = ip_hdr(skb);
	46	if (ih == NULL)
	47	return -EINVAL;
	48
	49	ad->u.net->v4info.saddr = ih->saddr;
	50	ad->u.net->v4info.daddr = ih->daddr;
	51
	52	if (proto)
	53	*proto = ih->protocol;
	54	/* non initial fragment */
	55	if (ntohs(ih->frag_off) & IP_OFFSET)
	56	return 0;
	57
	58	switch (ih->protocol) {
	59	case IPPROTO_TCP: {
	60	struct tcphdr *th = tcp_hdr(skb);
	61	if (th == NULL)
	62	break;
	63
	64	ad->u.net->sport = th->source;
	65	ad->u.net->dport = th->dest;
	66	break;
	67	}
	68	case IPPROTO_UDP: {
	69	struct udphdr *uh = udp_hdr(skb);
	70	if (uh == NULL)
	71	break;
	72
	73	ad->u.net->sport = uh->source;
	74	ad->u.net->dport = uh->dest;
	75	break;
	76	}
	77	case IPPROTO_DCCP: {
	78	struct dccp_hdr *dh = dccp_hdr(skb);
	79	if (dh == NULL)
	80	break;
	81
	82	ad->u.net->sport = dh->dccph_sport;
	83	ad->u.net->dport = dh->dccph_dport;
	84	break;
	85	}
	86	case IPPROTO_SCTP: {
	87	struct sctphdr *sh = sctp_hdr(skb);
	88	if (sh == NULL)
	89	break;
	90	ad->u.net->sport = sh->source;
	91	ad->u.net->dport = sh->dest;
	92	break;
	93	}
	94	default:
	95	ret = -EINVAL;
	96	}
	97	return ret;
	98	}
	99	#if IS_ENABLED(CONFIG_IPV6)
	100	/**
	101	* ipv6_skb_to_auditdata : fill auditdata from skb
	102	* @skb : the skb
	103	* @ad : the audit data to fill
	104	* @proto : the layer 4 protocol
	105	*
	106	* return 0 on success
	107	*/
	108	int ipv6_skb_to_auditdata(struct sk_buff *skb,
	109	struct common_audit_data ad, u8 proto)
	110	{
	111	int offset, ret = 0;
	112	struct ipv6hdr *ip6;
	113	u8 nexthdr;
	114	__be16 frag_off;
	115
	116	ip6 = ipv6_hdr(skb);
	117	if (ip6 == NULL)
	118	return -EINVAL;
	119	ad->u.net->v6info.saddr = ip6->saddr;
	120	ad->u.net->v6info.daddr = ip6->daddr;
	121	ret = 0;
	122	/* IPv6 can have several extension header before the Transport header
	123	* skip them */
	124	offset = skb_network_offset(skb);
	125	offset += sizeof(*ip6);
	126	nexthdr = ip6->nexthdr;
	127	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	128	if (offset < 0)
	129	return 0;
	130	if (proto)
	131	*proto = nexthdr;
	132	switch (nexthdr) {
	133	case IPPROTO_TCP: {
	134	struct tcphdr _tcph, *th;
	135
	136	th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
	137	if (th == NULL)
	138	break;
	139
	140	ad->u.net->sport = th->source;
	141	ad->u.net->dport = th->dest;
	142	break;
	143	}
	144	case IPPROTO_UDP: {
	145	struct udphdr _udph, *uh;
	146
	147	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
	148	if (uh == NULL)
	149	break;
	150
	151	ad->u.net->sport = uh->source;
	152	ad->u.net->dport = uh->dest;
	153	break;
	154	}
	155	case IPPROTO_DCCP: {
	156	struct dccp_hdr _dccph, *dh;
	157
	158	dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
	159	if (dh == NULL)
	160	break;
	161
	162	ad->u.net->sport = dh->dccph_sport;
	163	ad->u.net->dport = dh->dccph_dport;
	164	break;
	165	}
	166	case IPPROTO_SCTP: {
	167	struct sctphdr _sctph, *sh;
	168
	169	sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
	170	if (sh == NULL)
	171	break;
	172	ad->u.net->sport = sh->source;
	173	ad->u.net->dport = sh->dest;
	174	break;
	175	}
	176	default:
	177	ret = -EINVAL;
	178	}
	179	return ret;
	180	}
	181	#endif
	182
	183
	184	static inline void print_ipv6_addr(struct audit_buffer *ab,
	185	struct in6_addr *addr, __be16 port,
	186	char name1, char name2)
	187	{
	188	if (!ipv6_addr_any(addr))
	189	audit_log_format(ab, " %s=%pI6c", name1, addr);
	190	if (port)
	191	audit_log_format(ab, " %s=%d", name2, ntohs(port));
	192	}
	193
	194	static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
	195	__be16 port, char name1, char name2)
	196	{
	197	if (addr)
	198	audit_log_format(ab, " %s=%pI4", name1, &addr);
	199	if (port)
	200	audit_log_format(ab, " %s=%d", name2, ntohs(port));
	201	}
	202
	203	/**
	204	* dump_common_audit_data - helper to dump common audit data
	205	* @a : common audit data
	206	*
	207	*/
	208	static void dump_common_audit_data(struct audit_buffer *ab,
	209	struct common_audit_data *a)
	210	{
	211	char comm[sizeof(current->comm)];
	212
	213	/*
	214	* To keep stack sizes in check force programers to notice if they
	215	* start making this union too large! See struct lsm_network_audit
	216	* as an example of how to deal with large data.
	217	*/
	218	BUILD_BUG_ON(sizeof(a->u) > sizeof(void )2);
	219
	220	audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
	221	audit_log_untrustedstring(ab, memcpy(comm, current->comm, sizeof(comm)));
	222
	223	switch (a->type) {
	224	case LSM_AUDIT_DATA_NONE:
	225	return;
	226	case LSM_AUDIT_DATA_IPC:
	227	audit_log_format(ab, " key=%d ", a->u.ipc_id);
	228	break;
	229	case LSM_AUDIT_DATA_CAP:
	230	audit_log_format(ab, " capability=%d ", a->u.cap);
	231	break;
	232	case LSM_AUDIT_DATA_PATH: {
	233	struct inode *inode;
	234
	235	audit_log_d_path(ab, " path=", &a->u.path);
	236
	237	inode = d_backing_inode(a->u.path.dentry);
	238	if (inode) {
	239	audit_log_format(ab, " dev=");
	240	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	241	audit_log_format(ab, " ino=%lu", inode->i_ino);
	242	}
	243	break;
	244	}
	245	case LSM_AUDIT_DATA_FILE: {
	246	struct inode *inode;
	247
	248	audit_log_d_path(ab, " path=", &a->u.file->f_path);
	249
	250	inode = file_inode(a->u.file);
	251	if (inode) {
	252	audit_log_format(ab, " dev=");
	253	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	254	audit_log_format(ab, " ino=%lu", inode->i_ino);
	255	}
	256	break;
	257	}
	258	case LSM_AUDIT_DATA_IOCTL_OP: {
	259	struct inode *inode;
	260
	261	audit_log_d_path(ab, " path=", &a->u.op->path);
	262
	263	inode = a->u.op->path.dentry->d_inode;
	264	if (inode) {
	265	audit_log_format(ab, " dev=");
	266	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	267	audit_log_format(ab, " ino=%lu", inode->i_ino);
	268	}
	269
	270	audit_log_format(ab, " ioctlcmd=0x%hx", a->u.op->cmd);
	271	break;
	272	}
	273	case LSM_AUDIT_DATA_DENTRY: {
	274	struct inode *inode;
	275
	276	audit_log_format(ab, " name=");
	277	audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
	278
	279	inode = d_backing_inode(a->u.dentry);
	280	if (inode) {
	281	audit_log_format(ab, " dev=");
	282	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	283	audit_log_format(ab, " ino=%lu", inode->i_ino);
	284	}
	285	break;
	286	}
	287	case LSM_AUDIT_DATA_INODE: {
	288	struct dentry *dentry;
	289	struct inode *inode;
	290
	291	inode = a->u.inode;
	292	dentry = d_find_alias(inode);
	293	if (dentry) {
	294	audit_log_format(ab, " name=");
	295	audit_log_untrustedstring(ab,
	296	dentry->d_name.name);
	297	dput(dentry);
	298	}
	299	audit_log_format(ab, " dev=");
	300	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	301	audit_log_format(ab, " ino=%lu", inode->i_ino);
	302	break;
	303	}
	304	case LSM_AUDIT_DATA_TASK: {
	305	struct task_struct *tsk = a->u.tsk;
	306	if (tsk) {
	307	pid_t pid = task_tgid_nr(tsk);
	308	if (pid) {
	309	char comm[sizeof(tsk->comm)];
	310	audit_log_format(ab, " opid=%d ocomm=", pid);
	311	audit_log_untrustedstring(ab,
	312	memcpy(comm, tsk->comm, sizeof(comm)));
	313	}
	314	}
	315	break;
	316	}
	317	case LSM_AUDIT_DATA_NET:
	318	if (a->u.net->sk) {
	319	struct sock *sk = a->u.net->sk;
	320	struct unix_sock *u;
	321	struct unix_address *addr;
	322	int len = 0;
	323	char *p = NULL;
	324
	325	switch (sk->sk_family) {
	326	case AF_INET: {
	327	struct inet_sock *inet = inet_sk(sk);
	328
	329	print_ipv4_addr(ab, inet->inet_rcv_saddr,
	330	inet->inet_sport,
	331	"laddr", "lport");
	332	print_ipv4_addr(ab, inet->inet_daddr,
	333	inet->inet_dport,
	334	"faddr", "fport");
	335	break;
	336	}
	337	#if IS_ENABLED(CONFIG_IPV6)
	338	case AF_INET6: {
	339	struct inet_sock *inet = inet_sk(sk);
	340
	341	print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
	342	inet->inet_sport,
	343	"laddr", "lport");
	344	print_ipv6_addr(ab, &sk->sk_v6_daddr,
	345	inet->inet_dport,
	346	"faddr", "fport");
	347	break;
	348	}
	349	#endif
	350	case AF_UNIX:
	351	u = unix_sk(sk);
	352	addr = smp_load_acquire(&u->addr);
	353	if (!addr)
	354	break;
	355	if (u->path.dentry) {
	356	audit_log_d_path(ab, " path=", &u->path);
	357	break;
	358	}
	359	len = addr->len-sizeof(short);
	360	p = &addr->name->sun_path[0];
	361	audit_log_format(ab, " path=");
	362	if (*p)
	363	audit_log_untrustedstring(ab, p);
	364	else
	365	audit_log_n_hex(ab, p, len);
	366	break;
	367	}
	368	}
	369
	370	switch (a->u.net->family) {
	371	case AF_INET:
	372	print_ipv4_addr(ab, a->u.net->v4info.saddr,
	373	a->u.net->sport,
	374	"saddr", "src");
	375	print_ipv4_addr(ab, a->u.net->v4info.daddr,
	376	a->u.net->dport,
	377	"daddr", "dest");
	378	break;
	379	case AF_INET6:
	380	print_ipv6_addr(ab, &a->u.net->v6info.saddr,
	381	a->u.net->sport,
	382	"saddr", "src");
	383	print_ipv6_addr(ab, &a->u.net->v6info.daddr,
	384	a->u.net->dport,
	385	"daddr", "dest");
	386	break;
	387	}
	388	if (a->u.net->netif > 0) {
	389	struct net_device *dev;
	390
	391	/* NOTE: we always use init's namespace */
	392	dev = dev_get_by_index(&init_net, a->u.net->netif);
	393	if (dev) {
	394	audit_log_format(ab, " netif=%s", dev->name);
	395	dev_put(dev);
	396	}
	397	}
	398	break;
	399	#ifdef CONFIG_KEYS
	400	case LSM_AUDIT_DATA_KEY:
	401	audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
	402	if (a->u.key_struct.key_desc) {
	403	audit_log_format(ab, " key_desc=");
	404	audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
	405	}
	406	break;
	407	#endif
	408	case LSM_AUDIT_DATA_KMOD:
	409	audit_log_format(ab, " kmod=");
	410	audit_log_untrustedstring(ab, a->u.kmod_name);
	411	break;
	412	case LSM_AUDIT_DATA_IBPKEY: {
	413	struct in6_addr sbn_pfx;
	414
	415	memset(&sbn_pfx.s6_addr, 0,
	416	sizeof(sbn_pfx.s6_addr));
	417	memcpy(&sbn_pfx.s6_addr, &a->u.ibpkey->subnet_prefix,
	418	sizeof(a->u.ibpkey->subnet_prefix));
	419	audit_log_format(ab, " pkey=0x%x subnet_prefix=%pI6c",
	420	a->u.ibpkey->pkey, &sbn_pfx);
	421	break;
	422	}
	423	case LSM_AUDIT_DATA_IBENDPORT:
	424	audit_log_format(ab, " device=%s port_num=%u",
	425	a->u.ibendport->dev_name,
	426	a->u.ibendport->port);
	427	break;
	428	} /* switch (a->type) */
	429	}
	430
	431	/**
	432	* common_lsm_audit - generic LSM auditing function
	433	* @a: auxiliary audit data
	434	* @pre_audit: lsm-specific pre-audit callback
	435	* @post_audit: lsm-specific post-audit callback
	436	*
	437	* setup the audit buffer for common security information
	438	* uses callback to print LSM specific information
	439	*/
	440	void common_lsm_audit(struct common_audit_data *a,
	441	void (pre_audit)(struct audit_buffer , void *),
	442	void (post_audit)(struct audit_buffer , void *))
	443	{
	444	struct audit_buffer *ab;
	445
	446	if (a == NULL)
	447	return;
	448	/* we use GFP_ATOMIC so we won't sleep */
	449	ab = audit_log_start(audit_context(), GFP_ATOMIC \| __GFP_NOWARN,
	450	AUDIT_AVC);
	451
	452	if (ab == NULL)
	453	return;
	454
	455	if (pre_audit)
	456	pre_audit(ab, a);
	457
	458	dump_common_audit_data(ab, a);
	459
	460	if (post_audit)
	461	post_audit(ab, a);
	462
	463	audit_log_end(ab);
	464	}