[PATCH V2 2/6] audit: log namespace serial numbers

[Richard Guy Briggs]

Log the namespace serial numbers of a task in audit_log_task_info() which
is used by syscall audits, among others..

Idea first presented:
	https://www.redhat.com/archives/linux-audit/2013-March/msg00020.html

Typical output format would look something like:
	        type=SYSCALL msg=audit(1399651071.433:72): arch=c000003e syscall=272 success=yes exit=0 a0=40000000 a1=ffffffffffffffff a2=0 a3=22 items=0 ppid=1 pid=483 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="(t-daemon)" exe="/usr/lib/systemd/systemd" netns=97 utsns=2 ipcns=1 pidns=4 userns=3 mntns=5 subj=system_u:system_r:init_t:s0 key=(null)

The serial numbers are printed in hex.

Suggested-by: Aristeu Rozanski <arozansk@xxxxxxxxxx>
Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
---
 include/linux/audit.h |    7 +++++++
 kernel/audit.c        |   38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 22cfddb..0ef404a 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -101,6 +101,13 @@ extern int __weak audit_classify_compat_syscall(int abi, unsigned syscall);
 struct filename;
 
 extern void audit_log_session_info(struct audit_buffer *ab);
+#ifdef CONFIG_NAMESPACES
+extern void audit_log_namespace_info(struct audit_buffer *ab, struct task_struct *tsk);
+#else
+void audit_log_namespace_info(struct audit_buffer *ab, struct task_struct *tsk)
+{
+}
+#endif
 
 #ifdef CONFIG_AUDIT_COMPAT_GENERIC
 #define audit_is_compat(arch)  (!((arch) & __AUDIT_ARCH_64BIT))
diff --git a/kernel/audit.c b/kernel/audit.c
index 59c0bbe..fe783ad 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -64,7 +64,15 @@
 #endif
 #include <linux/freezer.h>
 #include <linux/tty.h>
+#include <linux/nsproxy.h>
+#include <linux/utsname.h>
+#include <linux/ipc_namespace.h>
+#include "../fs/mount.h"
+#include <linux/mount.h>
+#include <linux/mnt_namespace.h>
 #include <linux/pid_namespace.h>
+#include <net/net_namespace.h>
+#include <linux/user_namespace.h>
 #include <net/netns/generic.h>
 
 #include "audit.h"
@@ -1617,6 +1625,35 @@ void audit_log_session_info(struct audit_buffer *ab)
 	audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
 }
 
+#ifdef CONFIG_NAMESPACES
+void audit_log_namespace_info(struct audit_buffer *ab, struct task_struct *tsk)
+{
+	struct nsproxy *nsproxy;
+
+	rcu_read_lock();
+	nsproxy = task_nsproxy(tsk);
+	if (nsproxy != NULL) {
+		audit_log_format(ab, " mntns=%llx", nsproxy->mnt_ns->serial_num);
+#ifdef CONFIG_NET_NS
+		audit_log_format(ab, " netns=%llx", nsproxy->net_ns->serial_num);
+#endif
+#ifdef CONFIG_UTS_NS
+		audit_log_format(ab, " utsns=%llx", nsproxy->uts_ns->serial_num);
+#endif
+#ifdef CONFIG_IPC_NS
+		audit_log_format(ab, " ipcns=%llx", nsproxy->ipc_ns->serial_num);
+#endif
+	}
+#ifdef CONFIG_PID_NS
+	audit_log_format(ab, " pidns=%llx", task_active_pid_ns(tsk)->serial_num);
+#endif
+#ifdef CONFIG_USER_NS
+	audit_log_format(ab, " userns=%llx", task_cred_xxx(tsk, user_ns)->serial_num);
+#endif
+	rcu_read_unlock();
+}
+#endif /* CONFIG_NAMESPACES */
+
 void audit_log_key(struct audit_buffer *ab, char *key)
 {
 	audit_log_format(ab, " key=");
@@ -1861,6 +1898,7 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
 		up_read(&mm->mmap_sem);
 	} else
 		audit_log_format(ab, " exe=(null)");
+	audit_log_namespace_info(ab, tsk);
 	audit_log_task_context(ab);
 }
 EXPORT_SYMBOL(audit_log_task_info);
-- 
1.7.1

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