linux-kernel - [PATCH 3.16 067/136] ima: fix hash algorithm initialization

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Message-ID: <lsq.1518323471.653661116@decadent.org.uk>
Date:   Sun, 11 Feb 2018 04:31:11 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Mimi Zohar" <zohar@...ux.vnet.ibm.com>,
        "Boshi Wang" <wangboshi@...wei.com>
Subject: [PATCH 3.16 067/136] ima: fix hash algorithm initialization

3.16.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Boshi Wang <wangboshi@...wei.com>

commit ebe7c0a7be92bbd34c6ff5b55810546a0ee05bee upstream.

The hash_setup function always sets the hash_setup_done flag, even
when the hash algorithm is invalid.  This prevents the default hash
algorithm defined as CONFIG_IMA_DEFAULT_HASH from being used.

This patch sets hash_setup_done flag only for valid hash algorithms.

Fixes: e7a2ad7eb6f4 "ima: enable support for larger default filedata hash
	algorithms"
Signed-off-by: Boshi Wang <wangboshi@...wei.com>
Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 security/integrity/ima/ima_main.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -52,6 +52,8 @@ static int __init hash_setup(char *str)
 			ima_hash_algo = HASH_ALGO_SHA1;
 		else if (strncmp(str, "md5", 3) == 0)
 			ima_hash_algo = HASH_ALGO_MD5;
+		else
+			return 1;
 		goto out;
 	}
 
@@ -61,6 +63,8 @@ static int __init hash_setup(char *str)
 			break;
 		}
 	}
+	if (i == HASH_ALGO__LAST)
+		return 1;
 out:
 	hash_setup_done = 1;
 	return 1;