LSM: Infrastructure management of the file security

Move management of the file->f_security blob out of the
individual security modules and into the infrastructure.
The modules no longer allocate or free the data, instead
they tell the infrastructure how much space they require.

Signed-off-by: Casey Schaufler <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
[kees: adjusted for ordered init series]
Signed-off-by: Kees Cook <[e-mail]>

include/linux/lsm_hooks.h

···
  */
 struct lsm_blob_sizes {
 	int	lbs_cred;
+	int	lbs_file;
 };
 
 /*

security/apparmor/include/file.h

···
 				 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
 				 AA_EXEC_MMAP | AA_MAY_LINK)
 
-#define file_ctx(X) ((struct aa_file_ctx *)(X)->f_security)
+static inline struct aa_file_ctx *file_ctx(struct file *file)
+{
+	return file->f_security + apparmor_blob_sizes.lbs_file;
+}
 
 /* struct aa_file_ctx - the AppArmor context the file was opened in
  * @lock: lock to update the ctx

security/apparmor/lsm.c

···
 
 static int apparmor_file_alloc_security(struct file *file)
 {
-	int error = 0;
-
-	/* freed by apparmor_file_free_security */
+	struct aa_file_ctx *ctx = file_ctx(file);
 	struct aa_label *label = begin_current_label_crit_section();
-	file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL);
-	if (!file_ctx(file))
-		error = -ENOMEM;
-	end_current_label_crit_section(label);
 
-	return error;
+	spin_lock_init(&ctx->lock);
+	rcu_assign_pointer(ctx->label, aa_get_label(label));
+	end_current_label_crit_section(label);
+	return 0;
 }
 
 static void apparmor_file_free_security(struct file *file)
 {
-	aa_free_file_ctx(file_ctx(file));
+	struct aa_file_ctx *ctx = file_ctx(file);
+
+	if (ctx)
+		aa_put_label(rcu_access_pointer(ctx->label));
 }
 
 static int common_file_perm(const char *op, struct file *file, u32 mask)
···
  */
 struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
 	.lbs_cred = sizeof(struct aa_task_ctx *),
+	.lbs_file = sizeof(struct aa_file_ctx),
 };
 
 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {

security/security.c

···
 struct security_hook_heads security_hook_heads __lsm_ro_after_init;
 static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
 
+static struct kmem_cache *lsm_file_cache;
+
 char *lsm_names;
 static struct lsm_blob_sizes blob_sizes __lsm_ro_after_init;
 
···
 		return;
 
 	lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
+	lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
 }
 
 /* Prepare LSM for initialization. */
···
 		prepare_lsm(*lsm);
 
 	init_debug("cred blob size     = %d\n", blob_sizes.lbs_cred);
+	init_debug("file blob size     = %d\n", blob_sizes.lbs_file);
+
+	/*
+	 * Create any kmem_caches needed for blobs
+	 */
+	if (blob_sizes.lbs_file)
+		lsm_file_cache = kmem_cache_create("lsm_file_cache",
+						   blob_sizes.lbs_file, 0,
+						   SLAB_PANIC, NULL);
 
 	for (lsm = ordered_lsms; *lsm; lsm++)
 		initialize_lsm(*lsm);
···
 	rc = lsm_cred_alloc(cred, GFP_KERNEL);
 	if (rc)
 		panic("%s: Early cred alloc failed.\n", __func__);
+}
+
+/**
+ * lsm_file_alloc - allocate a composite file blob
+ * @file: the file that needs a blob
+ *
+ * Allocate the file blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+static int lsm_file_alloc(struct file *file)
+{
+	if (!lsm_file_cache) {
+		file->f_security = NULL;
+		return 0;
+	}
+
+	file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
+	if (file->f_security == NULL)
+		return -ENOMEM;
+	return 0;
 }
 
 /*
···
 
 int security_file_alloc(struct file *file)
 {
-	return call_int_hook(file_alloc_security, 0, file);
+	int rc = lsm_file_alloc(file);
+
+	if (rc)
+		return rc;
+	rc = call_int_hook(file_alloc_security, 0, file);
+	if (unlikely(rc))
+		security_file_free(file);
+	return rc;
 }
 
 void security_file_free(struct file *file)
 {
+	void *blob;
+
 	call_void_hook(file_free_security, file);
+
+	blob = file->f_security;
+	if (blob) {
+		file->f_security = NULL;
+		kmem_cache_free(lsm_file_cache, blob);
+	}
 }
 
 int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
···
 		return rc;
 
 	rc = call_int_hook(cred_alloc_blank, 0, cred, gfp);
-	if (rc)
+	if (unlikely(rc))
 		security_cred_free(cred);
 	return rc;
 }
···
 		return rc;
 
 	rc = call_int_hook(cred_prepare, 0, new, old, gfp);
-	if (rc)
+	if (unlikely(rc))
 		security_cred_free(new);
 	return rc;
 }

security/selinux/hooks.c

···
 __setup("checkreqprot=", checkreqprot_setup);
 
 static struct kmem_cache *sel_inode_cache;
-static struct kmem_cache *file_security_cache;
 
 /**
  * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
···
 
 static int file_alloc_security(struct file *file)
 {
-	struct file_security_struct *fsec;
+	struct file_security_struct *fsec = selinux_file(file);
 	u32 sid = current_sid();
-
-	fsec = kmem_cache_zalloc(file_security_cache, GFP_KERNEL);
-	if (!fsec)
-		return -ENOMEM;
 
 	fsec->sid = sid;
 	fsec->fown_sid = sid;
-	file->f_security = fsec;
 
 	return 0;
-}
-
-static void file_free_security(struct file *file)
-{
-	struct file_security_struct *fsec = selinux_file(file);
-	file->f_security = NULL;
-	kmem_cache_free(file_security_cache, fsec);
 }
 
 static int superblock_alloc_security(struct super_block *sb)
···
 static int selinux_file_alloc_security(struct file *file)
 {
 	return file_alloc_security(file);
-}
-
-static void selinux_file_free_security(struct file *file)
-{
-	file_free_security(file);
 }
 
 /*
···
 
 struct lsm_blob_sizes selinux_blob_sizes __lsm_ro_after_init = {
 	.lbs_cred = sizeof(struct task_security_struct),
+	.lbs_file = sizeof(struct file_security_struct),
 };
 
 static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
···
 
 	LSM_HOOK_INIT(file_permission, selinux_file_permission),
 	LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),
-	LSM_HOOK_INIT(file_free_security, selinux_file_free_security),
 	LSM_HOOK_INIT(file_ioctl, selinux_file_ioctl),
 	LSM_HOOK_INIT(mmap_file, selinux_mmap_file),
 	LSM_HOOK_INIT(mmap_addr, selinux_mmap_addr),
···
 
 	sel_inode_cache = kmem_cache_create("selinux_inode_security",
 					    sizeof(struct inode_security_struct),
-					    0, SLAB_PANIC, NULL);
-	file_security_cache = kmem_cache_create("selinux_file_security",
-					    sizeof(struct file_security_struct),
 					    0, SLAB_PANIC, NULL);
 	avc_init();
 

security/selinux/include/objsec.h

···
 
 static inline struct file_security_struct *selinux_file(const struct file *file)
 {
-	return file->f_security;
+	return file->f_security + selinux_blob_sizes.lbs_file;
 }
 
 #endif /* _SELINUX_OBJSEC_H_ */

security/smack/smack.h

···
 
 static inline struct smack_known **smack_file(const struct file *file)
 {
-	return (struct smack_known **)&file->f_security;
+	return (struct smack_known **)(file->f_security +
+				       smack_blob_sizes.lbs_file);
 }
 
 /*

security/smack/smack_lsm.c

···
 }
 
 /**
- * smack_file_free_security - clear a file security blob
- * @file: the object
- *
- * The security blob for a file is a pointer to the master
- * label list, so no memory is freed.
- */
-static void smack_file_free_security(struct file *file)
-{
-	file->f_security = NULL;
-}
-
-/**
  * smack_file_ioctl - Smack check on ioctls
  * @file: the object
  * @cmd: what to do
···
 
 struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = {
 	.lbs_cred = sizeof(struct task_smack),
+	.lbs_file = sizeof(struct smack_known *),
 };
 
 static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
···
 	LSM_HOOK_INIT(inode_getsecid, smack_inode_getsecid),
 
 	LSM_HOOK_INIT(file_alloc_security, smack_file_alloc_security),
-	LSM_HOOK_INIT(file_free_security, smack_file_free_security),
 	LSM_HOOK_INIT(file_ioctl, smack_file_ioctl),
 	LSM_HOOK_INIT(file_lock, smack_file_lock),
 	LSM_HOOK_INIT(file_fcntl, smack_file_fcntl),