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-rw-r--r--security/lsm_audit.c124
1 files changed, 58 insertions, 66 deletions
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index f84001019356..7d623b00495c 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -1,14 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* common LSM auditing functions
*
* Based on code written for SELinux by :
- * Stephen Smalley, <sds@tycho.nsa.gov>
+ * Stephen Smalley
* James Morris <jmorris@redhat.com>
* Author : Etienne Basset, <etienne.basset@ensta.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2,
- * as published by the Free Software Foundation.
*/
#include <linux/types.h>
@@ -27,9 +24,9 @@
#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>
+#include <linux/security.h>
/**
* ipv4_skb_to_auditdata : fill auditdata from skb
@@ -46,9 +43,6 @@ int ipv4_skb_to_auditdata(struct sk_buff *skb,
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;
@@ -61,8 +55,6 @@ int ipv4_skb_to_auditdata(struct sk_buff *skb,
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;
@@ -70,26 +62,14 @@ int ipv4_skb_to_auditdata(struct sk_buff *skb,
}
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;
@@ -117,11 +97,8 @@ int ipv6_skb_to_auditdata(struct sk_buff *skb,
__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);
@@ -155,17 +132,6 @@ int ipv6_skb_to_auditdata(struct sk_buff *skb,
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;
@@ -185,8 +151,8 @@ int ipv6_skb_to_auditdata(struct sk_buff *skb,
static inline void print_ipv6_addr(struct audit_buffer *ab,
- struct in6_addr *addr, __be16 port,
- char *name1, char *name2)
+ const struct in6_addr *addr, __be16 port,
+ const char *name1, const char *name2)
{
if (!ipv6_addr_any(addr))
audit_log_format(ab, " %s=%pI6c", name1, addr);
@@ -195,7 +161,7 @@ static inline void print_ipv6_addr(struct audit_buffer *ab,
}
static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
- __be16 port, char *name1, char *name2)
+ __be16 port, const char *name1, const char *name2)
{
if (addr)
audit_log_format(ab, " %s=%pI4", name1, &addr);
@@ -204,30 +170,25 @@ static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
}
/**
- * dump_common_audit_data - helper to dump common audit data
+ * audit_log_lsm_data - helper to log common LSM audit data
+ * @ab : the audit buffer
* @a : common audit data
- *
*/
-static void dump_common_audit_data(struct audit_buffer *ab,
- struct common_audit_data *a)
+void audit_log_lsm_data(struct audit_buffer *ab,
+ const struct common_audit_data *a)
{
- char comm[sizeof(current->comm)];
-
/*
- * To keep stack sizes in check force programers to notice if they
+ * To keep stack sizes in check force programmers 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);
+ audit_log_format(ab, " ipc_key=%d ", a->u.ipc_id);
break;
case LSM_AUDIT_DATA_CAP:
audit_log_format(ab, " capability=%d ", a->u.cap);
@@ -277,7 +238,9 @@ static void dump_common_audit_data(struct audit_buffer *ab,
struct inode *inode;
audit_log_format(ab, " name=");
+ spin_lock(&a->u.dentry->d_lock);
audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
+ spin_unlock(&a->u.dentry->d_lock);
inode = d_backing_inode(a->u.dentry);
if (inode) {
@@ -291,17 +254,19 @@ static void dump_common_audit_data(struct audit_buffer *ab,
struct dentry *dentry;
struct inode *inode;
+ rcu_read_lock();
inode = a->u.inode;
- dentry = d_find_alias(inode);
+ dentry = d_find_alias_rcu(inode);
if (dentry) {
audit_log_format(ab, " name=");
- audit_log_untrustedstring(ab,
- dentry->d_name.name);
- dput(dentry);
+ spin_lock(&dentry->d_lock);
+ audit_log_untrustedstring(ab, dentry->d_name.name);
+ spin_unlock(&dentry->d_lock);
}
audit_log_format(ab, " dev=");
audit_log_untrustedstring(ab, inode->i_sb->s_id);
audit_log_format(ab, " ino=%lu", inode->i_ino);
+ rcu_read_unlock();
break;
}
case LSM_AUDIT_DATA_TASK: {
@@ -309,24 +274,25 @@ static void dump_common_audit_data(struct audit_buffer *ab,
if (tsk) {
pid_t pid = task_tgid_nr(tsk);
if (pid) {
- char comm[sizeof(tsk->comm)];
+ char tskcomm[sizeof(tsk->comm)];
audit_log_format(ab, " opid=%d ocomm=", pid);
audit_log_untrustedstring(ab,
- memcpy(comm, tsk->comm, sizeof(comm)));
+ get_task_comm(tskcomm, tsk));
}
}
break;
}
case LSM_AUDIT_DATA_NET:
if (a->u.net->sk) {
- struct sock *sk = a->u.net->sk;
- struct unix_sock *u;
+ const struct sock *sk = a->u.net->sk;
+ const 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);
+ const struct inet_sock *inet = inet_sk(sk);
print_ipv4_addr(ab, inet->inet_rcv_saddr,
inet->inet_sport,
@@ -338,7 +304,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
}
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6: {
- struct inet_sock *inet = inet_sk(sk);
+ const struct inet_sock *inet = inet_sk(sk);
print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
inet->inet_sport,
@@ -351,14 +317,15 @@ static void dump_common_audit_data(struct audit_buffer *ab,
#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;
}
- if (!u->addr)
- break;
- len = u->addr->len-sizeof(short);
- p = &u->addr->name->sun_path[0];
+ len = addr->len-sizeof(short);
+ p = &addr->name->sun_path[0];
audit_log_format(ab, " path=");
if (*p)
audit_log_untrustedstring(ab, p);
@@ -426,10 +393,35 @@ static void dump_common_audit_data(struct audit_buffer *ab,
a->u.ibendport->dev_name,
a->u.ibendport->port);
break;
+ case LSM_AUDIT_DATA_LOCKDOWN:
+ audit_log_format(ab, " lockdown_reason=\"%s\"",
+ lockdown_reasons[a->u.reason]);
+ break;
+ case LSM_AUDIT_DATA_ANONINODE:
+ audit_log_format(ab, " anonclass=%s", a->u.anonclass);
+ break;
+ case LSM_AUDIT_DATA_NLMSGTYPE:
+ audit_log_format(ab, " nl-msgtype=%hu", a->u.nlmsg_type);
+ break;
} /* switch (a->type) */
}
/**
+ * dump_common_audit_data - helper to dump common audit data
+ * @ab : the audit buffer
+ * @a : common audit data
+ */
+static void dump_common_audit_data(struct audit_buffer *ab,
+ const struct common_audit_data *a)
+{
+ char comm[sizeof(current->comm)];
+
+ audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
+ audit_log_untrustedstring(ab, get_task_comm(comm, current));
+ audit_log_lsm_data(ab, a);
+}
+
+/**
* common_lsm_audit - generic LSM auditing function
* @a: auxiliary audit data
* @pre_audit: lsm-specific pre-audit callback
generated by cgit (git 2.34.1) at 2025-12-24 19:33:31 +0000