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From:   Roberto Sassu <roberto.sassu@huawei.com>
To:     <zohar@linux.ibm.com>, <dmitry.kasatkin@huawei.com>,
        <mjg59@google.com>
CC:     <linux-integrity@vger.kernel.org>,
        <linux-security-module@vger.kernel.org>,
        <linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <silviu.vlasceanu@huawei.com>,
        Roberto Sassu <roberto.sassu@huawei.com>,
        <stable@vger.kernel.org>
Subject: [PATCH v2 3/3] ima: show rules with IMA_INMASK correctly
Date:   Wed, 29 May 2019 15:30:35 +0200
Message-ID: <20190529133035.28724-4-roberto.sassu@huawei.com>
In-Reply-To: <20190529133035.28724-1-roberto.sassu@huawei.com>
References: <20190529133035.28724-1-roberto.sassu@huawei.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Show the '^' character when a policy rule has flag IMA_INMASK.

Fixes: 80eae209d63ac ("IMA: allow reading back the current IMA policy")
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Cc: stable@vger.kernel.org
---
 security/integrity/ima/ima_policy.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index e0cc323f948f..ae4034f041c4 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -1146,10 +1146,10 @@ enum {
 };
 
 static const char *const mask_tokens[] = {
-	"MAY_EXEC",
-	"MAY_WRITE",
-	"MAY_READ",
-	"MAY_APPEND"
+	"^MAY_EXEC",
+	"^MAY_WRITE",
+	"^MAY_READ",
+	"^MAY_APPEND"
 };
 
 #define __ima_hook_stringify(str)	(#str),
@@ -1209,6 +1209,7 @@ int ima_policy_show(struct seq_file *m, void *v)
 	struct ima_rule_entry *entry = v;
 	int i;
 	char tbuf[64] = {0,};
+	int offset = 0;
 
 	rcu_read_lock();
 
@@ -1232,15 +1233,17 @@ int ima_policy_show(struct seq_file *m, void *v)
 	if (entry->flags & IMA_FUNC)
 		policy_func_show(m, entry->func);
 
-	if (entry->flags & IMA_MASK) {
+	if ((entry->flags & IMA_MASK) || (entry->flags & IMA_INMASK)) {
+		if (entry->flags & IMA_MASK)
+			offset = 1;
 		if (entry->mask & MAY_EXEC)
-			seq_printf(m, pt(Opt_mask), mt(mask_exec));
+			seq_printf(m, pt(Opt_mask), mt(mask_exec) + offset);
 		if (entry->mask & MAY_WRITE)
-			seq_printf(m, pt(Opt_mask), mt(mask_write));
+			seq_printf(m, pt(Opt_mask), mt(mask_write) + offset);
 		if (entry->mask & MAY_READ)
-			seq_printf(m, pt(Opt_mask), mt(mask_read));
+			seq_printf(m, pt(Opt_mask), mt(mask_read) + offset);
 		if (entry->mask & MAY_APPEND)
-			seq_printf(m, pt(Opt_mask), mt(mask_append));
+			seq_printf(m, pt(Opt_mask), mt(mask_append) + offset);
 		seq_puts(m, " ");
 	}
 
-- 
2.17.1