linux-kernel - [PATCH 11/20] ima: added kernel parameter for disabling IMA

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-id: <50e70cb35c9fe517031db23565828c3e98bfcaf9.1398259638.git.d.kasatkin@samsung.com>
Date:	Wed, 23 Apr 2014 16:30:29 +0300
From:	Dmitry Kasatkin <d.kasatkin@...sung.com>
To:	zohar@...ux.vnet.ibm.com, dhowells@...hat.com, jmorris@...ei.org
Cc:	roberto.sassu@...ito.it, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dmitry Kasatkin <d.kasatkin@...sung.com>
Subject: [PATCH 11/20] ima: added kernel parameter for disabling IMA

If ima_tcb and ima_appraise_tcb are not specified on the kernel command
line, IMA policy remains empty and IMA functionality is disabled.

When policy is loaded from the kernel, IMA becomes enabled without specifying
ima_tcb and ima_appraise_tcb. There should be a possibiliy to disable IMA.
Distributions might want to compile IMA support, but leave for the user
to decide if to enable or disable IMA functionality.

This patch provides kernel parameter 'ima=off' that allows to disable IMA.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@...sung.com>
---
 security/integrity/ima/ima_main.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index c0aaed8..6af4966 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -67,6 +67,15 @@ out:
 }
 __setup("ima_hash=", hash_setup);
 
+static int ima_mode = 1;
+static int __init ima_setup(char *str)
+{
+	if (strncmp(str, "off", 3) == 0)
+		ima_mode = 0;
+	return 1;
+}
+__setup("ima=", ima_setup);
+
 /*
  * ima_rdwr_violation_check
  *
@@ -324,8 +333,9 @@ static int __init init_ima(void)
 	int error;
 
 	hash_setup(CONFIG_IMA_DEFAULT_HASH);
+
 	error = ima_init();
-	if (!error)
+	if (!error && ima_mode)
 		ima_initialized = 1;
 	return error;
 }
-- 
1.8.3.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/