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Diffstat (limited to 'security/lsm_audit.c')
-rw-r--r--security/lsm_audit.c196
1 files changed, 120 insertions, 76 deletions
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index 8d8d97dbb389..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@epoch.ncsc.mil>
+ * 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;
@@ -99,7 +79,7 @@ int ipv4_skb_to_auditdata(struct sk_buff *skb,
}
return ret;
}
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+#if IS_ENABLED(CONFIG_IPV6)
/**
* ipv6_skb_to_auditdata : fill auditdata from skb
* @skb : the skb
@@ -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)
{
- struct task_struct *tsk = current;
-
/*
- * 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=", tsk->pid);
- audit_log_untrustedstring(ab, tsk->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);
@@ -237,21 +198,51 @@ static void dump_common_audit_data(struct audit_buffer *ab,
audit_log_d_path(ab, " path=", &a->u.path);
- inode = a->u.path.dentry->d_inode;
+ 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=");
+ 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 = a->u.dentry->d_inode;
+ inode = d_backing_inode(a->u.dentry);
if (inode) {
audit_log_format(ab, " dev=");
audit_log_untrustedstring(ab, inode->i_sb->s_id);
@@ -263,36 +254,45 @@ 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:
- tsk = a->u.tsk;
- if (tsk && tsk->pid) {
- audit_log_format(ab, " pid=%d comm=", tsk->pid);
- audit_log_untrustedstring(ab, tsk->comm);
+ case LSM_AUDIT_DATA_TASK: {
+ struct task_struct *tsk = a->u.tsk;
+ if (tsk) {
+ pid_t pid = task_tgid_nr(tsk);
+ if (pid) {
+ char tskcomm[sizeof(tsk->comm)];
+ audit_log_format(ab, " opid=%d ocomm=", pid);
+ audit_log_untrustedstring(ab,
+ 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,
@@ -302,28 +302,30 @@ static void dump_common_audit_data(struct audit_buffer *ab,
"faddr", "fport");
break;
}
+#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6: {
- struct inet_sock *inet = inet_sk(sk);
- struct ipv6_pinfo *inet6 = inet6_sk(sk);
+ const struct inet_sock *inet = inet_sk(sk);
- print_ipv6_addr(ab, &inet6->rcv_saddr,
+ print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
inet->inet_sport,
"laddr", "lport");
- print_ipv6_addr(ab, &inet6->daddr,
+ 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;
}
- 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);
@@ -375,10 +377,51 @@ static void dump_common_audit_data(struct audit_buffer *ab,
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;
+ 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
@@ -396,7 +439,8 @@ void common_lsm_audit(struct common_audit_data *a,
if (a == NULL)
return;
/* we use GFP_ATOMIC so we won't sleep */
- ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_AVC);
+ ab = audit_log_start(audit_context(), GFP_ATOMIC | __GFP_NOWARN,
+ AUDIT_AVC);
if (ab == NULL)
return;
generated by cgit (git 2.34.1) at 2025-12-21 21:38:41 +0000