linux-kernel - [PATCH 08/12] ima: Shallow copy the args_p member of ima_rule

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Message-Id: <20200623003236.830149-9-tyhicks@linux.microsoft.com>
Date:   Mon, 22 Jun 2020 19:32:32 -0500
From:   Tyler Hicks <tyhicks@...ux.microsoft.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>
Cc:     James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        Prakhar Srivastava <prsriva02@...il.com>,
        linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: [PATCH 08/12] ima: Shallow copy the args_p member of ima_rule_entry.lsm elements

The args_p member is a simple string that is allocated by
ima_rule_init(). Shallow copy it like other non-LSM references in
ima_rule_entry structs.

There are no longer any necessary error path cleanups to do in
ima_lsm_copy_rule() so reference ownership from entry to nentry becomes
easier.

Signed-off-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
---
 security/integrity/ima/ima_policy.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index e33347148aa9..e9c7d318fdd4 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -306,10 +306,8 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
 			continue;
 
 		nentry->lsm[i].type = entry->lsm[i].type;
-		nentry->lsm[i].args_p = kstrdup(entry->lsm[i].args_p,
-						GFP_KERNEL);
-		if (!nentry->lsm[i].args_p)
-			goto out_err;
+		nentry->lsm[i].args_p = entry->lsm[i].args_p;
+		entry->lsm[i].args_p = NULL;
 
 		security_filter_rule_init(nentry->lsm[i].type,
 					  Audit_equal,
@@ -325,13 +323,6 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
 	entry->keyrings = NULL;
 	entry->template = NULL;
 	return nentry;
-
-out_err:
-	nentry->fsname = NULL;
-	nentry->keyrings = NULL;
-	nentry->template = NULL;
-	ima_free_rule(nentry);
-	return NULL;
 }
 
 static int ima_lsm_update_rule(struct ima_rule_entry *entry)
-- 
2.25.1