linux-kernel - [RFC 02/11] ima: qualify pathname in audit measurement record

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Date:   Thu, 11 May 2017 10:59:54 -0300
From:   Guilherme Magalhaes <guilherme.magalhaes@....com>
To:     dmitry.kasatkin@...il.com, zohar@...ux.vnet.ibm.com
Cc:     viro@...iv.linux.org.uk, james.l.morris@...cle.com,
        serge@...lyn.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-ima-devel@...ts.sourceforge.net,
        linux-ima-user@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org, tycho@...ker.com,
        joaquims@....com, nigel.edwards@....com,
        Guilherme Magalhaes <guilherme.magalhaes@....com>
Subject: [RFC 02/11] ima: qualify pathname in audit measurement record

Adding new fields (mount namespace id, file inode and device name) to
uniquely identify a pathname considering different mount namespaces.
The file inode on a given device is unique and these fields are
required to identify a namespace id since this id can be released
and later reused by a different namespace.

Signed-off-by: Guilherme Magalhaes <guilherme.magalhaes@....com>
---
 security/integrity/ima/ima_api.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index c2edba8..b05c1fd 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -18,6 +18,7 @@
 #include <linux/fs.h>
 #include <linux/xattr.h>
 #include <linux/evm.h>
+#include <linux/proc_ns.h>
 
 #include "ima.h"
 
@@ -293,6 +294,7 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
 	char hash[(iint->ima_hash->length * 2) + 1];
 	const char *algo_name = hash_algo_name[iint->ima_hash->algo];
 	char algo_hash[sizeof(hash) + strlen(algo_name) + 2];
+	struct ns_common *ns;
 	int i;
 
 	if (iint->flags & IMA_AUDITED)
@@ -312,6 +314,12 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
 	audit_log_format(ab, " hash=");
 	snprintf(algo_hash, sizeof(algo_hash), "%s:%s", algo_name, hash);
 	audit_log_untrustedstring(ab, algo_hash);
+	ns = mntns_operations.get(current);
+	audit_log_format(ab, " mnt_ns=%u", ns->inum);
+	mntns_operations.put(ns);
+	audit_log_format(ab, " dev=");
+	audit_log_untrustedstring(ab, iint->inode->i_sb->s_id);
+	audit_log_format(ab, " ino=%lu", iint->inode->i_ino);
 
 	audit_log_task_info(ab, current);
 	audit_log_end(ab);
-- 
2.7.4