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Subject: [PATCH v5 36/38] Smack: Abstract use of ipc security blobs
To:     James Morris <jmorris@namei.org>,
        LSM <linux-security-module@vger.kernel.org>,
        LKLM <linux-kernel@vger.kernel.org>,
        SE Linux <selinux@tycho.nsa.gov>
Cc:     John Johansen <john.johansen@canonical.com>,
        Kees Cook <keescook@chromium.org>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Paul Moore <paul@paul-moore.com>,
        "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        Stephen Smalley <sds@tycho.nsa.gov>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        =?UTF-8?Q?Micka=c3=abl_Sala=c3=bcn?= <mic@digikod.net>,
        Salvatore Mesoraca <s.mesoraca16@gmail.com>
References: <50db058a-7dde-441b-a7f9-f6837fe8b69f@schaufler-ca.com>
From:   Casey Schaufler <casey@schaufler-ca.com>
Message-ID: <36cc3a88-0982-2b42-be5d-1944fe954c30@schaufler-ca.com>
Date:   Mon, 26 Nov 2018 15:55:17 -0800
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Sender: linux-kernel-owner@vger.kernel.org
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Don't use the ipc->security pointer directly.
Don't use the msg_msg->security pointer directly.
Provide helper functions that provides the security blob pointers.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 security/smack/smack.h     | 11 +++++++++++
 security/smack/smack_lsm.c | 14 +++++++++-----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/security/smack/smack.h b/security/smack/smack.h
index bf0abc35ca1c..0adddbeecc62 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -24,6 +24,7 @@
 #include <linux/list.h>
 #include <linux/rculist.h>
 #include <linux/lsm_audit.h>
+#include <linux/msg.h>
 
 /*
  * Use IPv6 port labeling if IPv6 is enabled and secmarks
@@ -373,6 +374,16 @@ static inline struct inode_smack *smack_inode(const struct inode *inode)
 	return inode->i_security + smack_blob_sizes.lbs_inode;
 }
 
+static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg)
+{
+	return (struct smack_known **)&msg->security;
+}
+
+static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc)
+{
+	return (struct smack_known **)&ipc->security;
+}
+
 /*
  * Is the directory transmuting?
  */
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 9ff185af378a..ceda326a6e47 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2918,7 +2918,9 @@ static void smack_msg_msg_free_security(struct msg_msg *msg)
  */
 static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
 {
-	return (struct smack_known *)isp->security;
+	struct smack_known **blob = smack_ipc(isp);
+
+	return *blob;
 }
 
 /**
@@ -2929,9 +2931,9 @@ static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
  */
 static int smack_ipc_alloc_security(struct kern_ipc_perm *isp)
 {
-	struct smack_known *skp = smk_of_current();
+	struct smack_known **blob = smack_ipc(isp);
 
-	isp->security = skp;
+	*blob = smk_of_current();
 	return 0;
 }
 
@@ -3243,7 +3245,8 @@ static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg
  */
 static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
 {
-	struct smack_known *iskp = ipp->security;
+	struct smack_known **blob = smack_ipc(ipp);
+	struct smack_known *iskp = *blob;
 	int may = smack_flags_to_may(flag);
 	struct smk_audit_info ad;
 	int rc;
@@ -3264,7 +3267,8 @@ static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
  */
 static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
 {
-	struct smack_known *iskp = ipp->security;
+	struct smack_known **blob = smack_ipc(ipp);
+	struct smack_known *iskp = *blob;
 
 	*secid = iskp->smk_secid;
 }
-- 
2.14.5