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From: casey@schaufler-ca.com (Casey Schaufler)
To: linux-security-module@vger.kernel.org
Subject: [PATCH 04/11] LSM: manage task security blobs
Date: Tue, 29 Aug 2017 13:58:41 -0700	[thread overview]
Message-ID: <601810ff-d4be-fc64-5514-8dbbdb45e3f5@schaufler-ca.com> (raw)
In-Reply-To: <bbf8bc4a-b56d-e800-4231-60058e4a88bc@schaufler-ca.com>

Subject: [PATCH 04/11] LSM: manage task security blobs

Move management of task security blobs into the security
infrastructure. Modules are required to identify the space
they require. At this time there are no modules that use
task blobs.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/lsm_hooks.h |  1 +
 security/security.c       | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 0603c57726e4..8d6e757e78dc 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1924,6 +1924,7 @@ struct security_hook_list {
 struct lsm_blob_sizes {
 	int	lbs_cred;
 	int	lbs_file;
+	int	lbs_task;
 };
 
 /*
diff --git a/security/security.c b/security/security.c
index b9346db8a2d4..3ab260b6ae96 100644
--- a/security/security.c
+++ b/security/security.c
@@ -92,6 +92,7 @@ int __init security_init(void)
 #ifdef CONFIG_SECURITY_LSM_DEBUG
 	pr_info("LSM: cred blob size       = %d\n", blob_sizes.lbs_cred);
 	pr_info("LSM: file blob size       = %d\n", blob_sizes.lbs_file);
+	pr_info("LSM: task blob size       = %d\n", blob_sizes.lbs_task);
 #endif
 
 	return 0;
@@ -269,6 +270,7 @@ void __init security_add_blobs(struct lsm_blob_sizes *needed)
 {
 	lsm_set_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
 	lsm_set_size(&needed->lbs_file, &blob_sizes.lbs_file);
+	lsm_set_size(&needed->lbs_task, &blob_sizes.lbs_task);
 }
 
 /**
@@ -294,6 +296,29 @@ int lsm_file_alloc(struct file *file)
 	return 0;
 }
 
+/**
+ * lsm_task_alloc - allocate a composite task blob
+ * @task: the task that needs a blob
+ *
+ * Allocate the task blob for all the modules
+ *
+ * Returns 0, or -ENOMEM if memory can't be allocated.
+ */
+int lsm_task_alloc(struct task_struct *task)
+{
+#ifdef CONFIG_SECURITY_LSM_DEBUG
+	if (task->security)
+		pr_info("%s: Inbound task blob is not NULL.\n", __func__);
+#endif
+	if (blob_sizes.lbs_task == 0)
+		return 0;
+
+	task->security = kzalloc(blob_sizes.lbs_task, GFP_KERNEL);
+	if (task->security == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
 /*
  * Hook list operation macros.
  *
@@ -1102,6 +1127,9 @@ int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
 void security_task_free(struct task_struct *task)
 {
 	call_void_hook(task_free, task);
+
+	kfree(task->security);
+	task->security = NULL;
 }
 
 int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
-- 
2.13.0


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  parent reply	other threads:[~2017-08-29 20:58 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-29 20:52 [PATCH RFC 00/11] LSM: Stacking for major security modules Casey Schaufler
2017-08-29 20:55 ` [PATCH 01/11] procfs: add smack subdir to attrs Casey Schaufler
2017-08-31  9:12   ` John Johansen
2017-08-29 20:56 ` Subject: [PATCH 02/11] LSM: manage credential security blobs Casey Schaufler
2017-08-29 20:57 ` [PATCH 03/11] LSM: Manage file " Casey Schaufler
2017-08-31 15:47   ` [Non-DoD Source] " Stephen Smalley
2017-08-31 15:58     ` Casey Schaufler
2017-08-31 18:41       ` Stephen Smalley
2017-08-29 20:58 ` Casey Schaufler [this message]
2017-08-29 20:59 ` [PATCH 05/11] LSM: Infrastructure management of the remaining blobs Casey Schaufler
2017-08-31 16:09   ` [Non-DoD Source] " Stephen Smalley
2017-08-29 21:00 ` [PATCH 06/11] LSM: general but not extreme module stacking Casey Schaufler
2017-08-30  7:28   ` James Morris
2017-08-29 21:01 ` [PATCH 07/11] LSM: Shared secids by token Casey Schaufler
2017-08-31 16:30   ` [Non-DoD Source] " Stephen Smalley
2017-08-31 18:37     ` Stephen Smalley
2017-08-31 22:43       ` Casey Schaufler
2017-08-29 21:02 ` [PATCH 08/11] LSM: Complete abstraction of superblock blob in Smack Casey Schaufler
2017-08-29 21:03 ` [PATCH 09/11] LSM: Multiple security mount option support Casey Schaufler
2017-08-29 21:03 ` [PATCH 10/11] LSM: Complete task_alloc hook Casey Schaufler
2017-08-29 21:05 ` [PATCH 11/11] LSM: Allow stacking of all existing security Casey Schaufler

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