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From: Casey Schaufler <casey@schaufler-ca.com>
To: casey.schaufler@intel.com, jmorris@namei.org,
	linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc: casey@schaufler-ca.com, keescook@chromium.org,
	john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp,
	paul@paul-moore.com, sds@tycho.nsa.gov
Subject: [PATCH v7 01/16] LSM: Single hook called in secmark refcounting
Date: Wed,  7 Aug 2019 15:42:30 -0700
Message-ID: <20190807224245.10798-3-casey@schaufler-ca.com> (raw)
In-Reply-To: <20190807224245.10798-1-casey@schaufler-ca.com>

Restrict the secmark_refcount_dec and secmark_refcount_inc
interfaces to a single module. The secmark is too small to
share, and this allows the modules a way to detect if the
secmark is theirs to use.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/security.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/security/security.c b/security/security.c
index e9f579483d12..0467f194d87d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2564,13 +2564,25 @@ EXPORT_SYMBOL(security_secmark_relabel_packet);
 
 void security_secmark_refcount_inc(void)
 {
-	call_void_hook(secmark_refcount_inc);
+	struct security_hook_list *hp;
+
+	hlist_for_each_entry(hp, &security_hook_heads.secmark_refcount_inc,
+			     list) {
+		hp->hook.secmark_refcount_inc();
+		break;
+	}
 }
 EXPORT_SYMBOL(security_secmark_refcount_inc);
 
 void security_secmark_refcount_dec(void)
 {
-	call_void_hook(secmark_refcount_dec);
+	struct security_hook_list *hp;
+
+	hlist_for_each_entry(hp, &security_hook_heads.secmark_refcount_dec,
+			     list) {
+		hp->hook.secmark_refcount_dec();
+		break;
+	}
 }
 EXPORT_SYMBOL(security_secmark_refcount_dec);
 
-- 
2.20.1


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-07 22:42 [PATCH v7 00/16] LSM: Full module stacking Casey Schaufler
2019-08-07 22:42 ` Casey Schaufler
2019-08-07 22:42 ` Casey Schaufler [this message]
2019-08-07 22:42 ` [PATCH v7 02/16] Smack: Detect if secmarks can be safely used Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 03/16] LSM: Support multiple LSMs using inode_init_security Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 04/16] LSM: List multiple security attributes in security_inode_listsecurity Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 05/16] LSM: Multiple modules using security_ismaclabel Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 06/16] LSM: Make multiple MAC modules safe in nfs and kernfs Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 07/16] LSM: Correct handling of ENOSYS in inode_setxattr Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 08/16] LSM: Infrastructure security blobs for mount options Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 09/16] LSM: Fix for security_init_inode_security Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 10/16] LSM: Change error detection for UDP peer security Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 11/16] Netlabel: Add a secattr comparison API function Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 12/16] Netlabel: Provide labeling type to security modules Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 13/16] LSM: Remember the NLTYPE of netlabel sockets Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 14/16] LSM: Hook for netlabel reconciliation Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 15/16] LSM: Avoid network conflicts in SELinux and Smack Casey Schaufler
2019-08-07 22:42 ` [PATCH v7 16/16] Smack: Remove the exclusive flag Casey Schaufler

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