[36/59] LSM: Limit calls to certain module hooks

Message ID	20190409213946.1667-37-casey@schaufler-ca.com (mailing list archive)
State	Not Applicable
Headers	show Return-Path: <selinux-owner@kernel.org> 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 Subject: [PATCH 36/59] LSM: Limit calls to certain module hooks Date: Tue, 9 Apr 2019 14:39:23 -0700 Message-Id: <20190409213946.1667-37-casey@schaufler-ca.com> In-Reply-To: <20190409213946.1667-1-casey@schaufler-ca.com> References: <20190409213946.1667-1-casey@schaufler-ca.com> Sender: selinux-owner@vger.kernel.org Precedence: bulk
Series	LSM: Module stacking for AppArmor \| expand [00/59] LSM: Module stacking for AppArmor [01/59] LSM: Infrastructure management of the superblock [02/59] LSM: Infrastructure management of the sock security [03/59] LSM: Infrastructure management of the key security blob [04/59] LSM: Create an lsm_export data structure. [05/59] LSM: Use lsm_export in the inode_getsecid hooks [06/59] LSM: Use lsm_export in the cred_getsecid hooks [07/59] LSM: Use lsm_export in the ipc_getsecid and task_getsecid hooks [08/59] LSM: Use lsm_export in the kernel_ask_as hooks [09/59] LSM: Use lsm_export in the getpeersec_dgram hooks [10/59] LSM: Use lsm_export in the audit_rule_match hooks [11/59] LSM: Fix logical operation in lsm_export checks [12/59] LSM: Use lsm_export in the secid_to_secctx hooks [13/59] LSM: Use lsm_export in the secctx_to_secid hooks [14/59] LSM: Use lsm_export in security_audit_rule_match [15/59] LSM: Use lsm_export in security_kernel_act_as [16/59] LSM: Use lsm_export in security_socket_getpeersec_dgram [17/59] LSM: Use lsm_export in security_secctx_to_secid [18/59] LSM: Use lsm_export in security_secid_to_secctx [19/59] LSM: Use lsm_export in security_ipc_getsecid [20/59] LSM: Use lsm_export in security_task_getsecid [21/59] LSM: Use lsm_export in security_inode_getsecid [22/59] LSM: Use lsm_export in security_cred_getsecid [23/59] Audit: Change audit_sig_sid to audit_sig_lsm [24/59] Audit: Convert target_sid to an lsm_export structure [25/59] Audit: Convert osid to an lsm_export structure [26/59] IMA: Clean out lsm_export scaffolding [27/59] NET: Store LSM access information in the socket blob for UDS [28/59] NET: Remove scaffolding on secmarks [29/59] NET: Remove scaffolding on new secmarks [30/59] NET: Remove netfilter scaffolding for lsm_export [31/59] Netlabel: Replace secids with lsm_export [32/59] LSM: Remove lsm_export scaffolding functions [33/59] IMA: FIXUP prototype using lsm_export [34/59] Smack: Restore the release_secctx hook [35/59] AppArmor: Remove unnecessary hook stub [36/59] LSM: Limit calls to certain module hooks [37/59] LSM: Create a data structure for a security context [38/59] LSM: Use lsm_context in secid_to_secctx hooks [39/59] LSM: Use lsm_context in secctx_to_secid hooks [40/59] LSM: Use lsm_context in inode_getsecctx hooks [41/59] LSM: Use lsm_context in inode_notifysecctx hooks [42/59] LSM: Use lsm_context in dentry_init_security hooks [43/59] LSM: Use lsm_context in security_dentry_init_security [44/59] LSM: Use lsm_context in security_inode_notifysecctx [45/59] LSM: Use lsm_context in security_inode_getsecctx [46/59] LSM: Use lsm_context in security_secctx_to_secid [47/59] LSM: Use lsm_context in release_secctx hooks [48/59] LSM: Use lsm_context in security_release_secctx [49/59] LSM: Use lsm_context in security_secid_to_secctx [50/59] fs: remove lsm_context scaffolding [51/59] LSM: Add the release function to the lsm_context [52/59] LSM: Use lsm_context in inode_setsecctx hooks [53/59] LSM: Use lsm_context in security_inode_setsecctx [54/59] kernfs: remove lsm_context scaffolding [55/59] LSM: Remove unused macro [56/59] LSM: Special handling for secctx lsm hooks [57/59] SELinux: Use blob offset in current_sid [58/59] LSM: Specify which LSM to display with /proc/self/attr/display [59/59] AppArmor: Remove the exclusive flag

Message ID

20190409213946.1667-37-casey@schaufler-ca.com (mailing list archive)

State

Not Applicable

Headers

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
Subject: [PATCH 36/59] LSM: Limit calls to certain module hooks
Date: Tue,  9 Apr 2019 14:39:23 -0700
Message-Id: <20190409213946.1667-37-casey@schaufler-ca.com>
In-Reply-To: <20190409213946.1667-1-casey@schaufler-ca.com>
References: <20190409213946.1667-1-casey@schaufler-ca.com>
Sender: selinux-owner@vger.kernel.org
Precedence: bulk

Series

LSM: Module stacking for AppArmor | expand

Commit Message

Casey Schaufler April 9, 2019, 9:39 p.m. UTC

LSM hooks dealing with security context strings should
only be called for one security module. Add call macros
that invoke a single module hook and us in for those cases.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 security/security.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/security/security.c b/security/security.c
index 015c38c882ba..7bf16c547010 100644
--- a/security/security.c
+++ b/security/security.c
@@ -713,6 +713,16 @@  int lsm_superblock_alloc(struct super_block *sb)
 			P->hook.FUNC(__VA_ARGS__);		\
 	} while (0)
 
+#define call_one_void_hook(FUNC, ...)				\
+	do {							\
+		struct security_hook_list *P;			\
+								\
+		hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
+			P->hook.FUNC(__VA_ARGS__);		\
+			break;					\
+		}						\
+	} while (0)
+
 #define call_int_hook(FUNC, IRC, ...) ({			\
 	int RC = IRC;						\
 	do {							\
@@ -727,6 +737,19 @@  int lsm_superblock_alloc(struct super_block *sb)
 	RC;							\
 })
 
+#define call_one_int_hook(FUNC, IRC, ...) ({			\
+	int RC = IRC;						\
+	do {							\
+		struct security_hook_list *P;			\
+								\
+		hlist_for_each_entry(P, &security_hook_heads.FUNC, list) { \
+			RC = P->hook.FUNC(__VA_ARGS__);		\
+			break;					\
+		}						\
+	} while (0);						\
+	RC;							\
+})
+
 /* Security operations */
 
 int security_binder_set_context_mgr(struct task_struct *mgr)
@@ -1966,7 +1989,8 @@  EXPORT_SYMBOL(security_ismaclabel);
 
 int security_secid_to_secctx(struct lsm_export *l, char **secdata, u32 *seclen)
 {
-	return call_int_hook(secid_to_secctx, -EOPNOTSUPP, l, secdata, seclen);
+	return call_one_int_hook(secid_to_secctx, -EOPNOTSUPP, l, secdata,
+				 seclen);
 }
 EXPORT_SYMBOL(security_secid_to_secctx);
 
@@ -1974,13 +1998,13 @@  int security_secctx_to_secid(const char *secdata, u32 seclen,
 			     struct lsm_export *l)
 {
 	lsm_export_init(l);
-	return call_int_hook(secctx_to_secid, 0, secdata, seclen, l);
+	return call_one_int_hook(secctx_to_secid, 0, secdata, seclen, l);
 }
 EXPORT_SYMBOL(security_secctx_to_secid);
 
 void security_release_secctx(char *secdata, u32 seclen)
 {
-	call_void_hook(release_secctx, secdata, seclen);
+	call_one_void_hook(release_secctx, secdata, seclen);
 }
 EXPORT_SYMBOL(security_release_secctx);
 
@@ -2105,7 +2129,7 @@  EXPORT_SYMBOL(security_sock_rcv_skb);
 int security_socket_getpeersec_stream(struct socket *sock, char __user *optval,
 				      int __user *optlen, unsigned len)
 {
-	return call_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
+	return call_one_int_hook(socket_getpeersec_stream, -ENOPROTOOPT, sock,
 				optval, optlen, len);
 }

[36/59] LSM: Limit calls to certain module hooks

Commit Message

Patch