linux-kernel - [PATCH 3/6] ima: remove unneeded size_limit argument from ima_eventdigest_init

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Date:	Fri, 15 Nov 2013 14:45:41 +0100
From:	Roberto Sassu <roberto.sassu@...ito.it>
To:	linux-security-module@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	linux-ima-devel@...ts.sourceforge.net, zohar@...ibm.com,
	d.kasatkin@...sung.com, james.l.morris@...cle.com,
	Roberto Sassu <roberto.sassu@...ito.it>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Subject: [PATCH 3/6] ima: remove unneeded size_limit argument from ima_eventdigest_init_common()

This patch removes the 'size_limit' argument
from ima_eventdigest_init_common(). Since the 'd' field will never include
the hash algorithm as prefix and the 'd-ng' will always have it, we can
use the hash algorithm to differentiate the two cases in the modified
function (it is equal to HASH_ALGO__LAST in the first case, the opposite
in the second).

Signed-off-by: Roberto Sassu <roberto.sassu@...ito.it>
Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
---
 security/integrity/ima/ima_template_lib.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c
index 4752a53..6d01c69 100644
--- a/security/integrity/ima/ima_template_lib.c
+++ b/security/integrity/ima/ima_template_lib.c
@@ -158,8 +158,7 @@ void ima_show_template_sig(struct seq_file *m, enum ima_show_type show,
 }
 
 static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
-				       struct ima_field_data *field_data,
-				       bool size_limit)
+				       struct ima_field_data *field_data)
 {
 	/*
 	 * digest formats:
@@ -172,11 +171,10 @@ static int ima_eventdigest_init_common(u8 *digest, u32 digestsize, u8 hash_algo,
 	enum data_formats fmt = DATA_FMT_DIGEST;
 	u32 offset = 0;
 
-	if (!size_limit) {
+	if (hash_algo < HASH_ALGO__LAST) {
 		fmt = DATA_FMT_DIGEST_WITH_ALGO;
-		if (hash_algo < HASH_ALGO__LAST)
-			offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1,
-					   "%s", hash_algo_name[hash_algo]);
+		offset += snprintf(buffer, CRYPTO_MAX_ALG_NAME + 1, "%s",
+				   hash_algo_name[hash_algo]);
 		buffer[offset] = ':';
 		offset += 2;
 	}
@@ -240,7 +238,7 @@ int ima_eventdigest_init(struct integrity_iint_cache *iint, struct file *file,
 	cur_digestsize = hash.hdr.length;
 out:
 	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
-					   HASH_ALGO__LAST, field_data, true);
+					   HASH_ALGO__LAST, field_data);
 }
 
 /*
@@ -264,7 +262,7 @@ int ima_eventdigest_ng_init(struct integrity_iint_cache *iint,
 	hash_algo = iint->ima_hash->algo;
 out:
 	return ima_eventdigest_init_common(cur_digest, cur_digestsize,
-					   hash_algo, field_data, false);
+					   hash_algo, field_data);
 }
 
 static int ima_eventname_init_common(struct integrity_iint_cache *iint,
-- 
1.8.1.4


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