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Subject[PATCH] BSD Jail LSM (1/3)
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Date
Attached is a patch which introduces a new LSM hook,
security_task_lookup. This hook allows an LSM to mediate visibility of
/proc/<pid> on a per-process level. It applies cleanly to 2.6.8.1 and
has been tested on xSeries, pSeries, and zSeries. The bsdjail lsm which
will be sent next is a user of this hook.

Please apply.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>

-serge

diff -Nru linux-2.6.8.1/fs/proc/base.c linux-2.6.8.1-jail/fs/proc/base.c
--- linux-2.6.8.1/fs/proc/base.c 2004-08-14 05:55:35.000000000 -0500
+++ linux-2.6.8.1-jail/fs/proc/base.c 2004-09-01 04:42:26.000000000 -0500
@@ -1679,6 +1679,8 @@
int tgid = p->pid;
if (!pid_alive(p))
continue;
+ if (security_task_lookup(p))
+ continue;
if (--index >= 0)
continue;
tgids[nr_tgids] = tgid;
diff -Nru linux-2.6.8.1/include/linux/security.h linux-2.6.8.1-jail/include/linux/security.h
--- linux-2.6.8.1/include/linux/security.h 2004-08-14 05:55:48.000000000 -0500
+++ linux-2.6.8.1-jail/include/linux/security.h 2004-09-01 04:42:26.000000000 -0500
@@ -627,6 +627,11 @@
* Set the security attributes in @p->security for a kernel thread that
* is being reparented to the init task.
* @p contains the task_struct for the kernel thread.
+ * @task_lookup:
+ * Check permission to see the /proc/<pid> entry for process @p.
+ * @p contains the task_struct for task <pid> which is being looked
+ * up under /proc
+ * return 0 if permission is granted.
* @task_to_inode:
* Set the security attributes for an inode based on an associated task's
* security attributes, e.g. for /proc/pid inodes.
@@ -1152,6 +1157,7 @@
unsigned long arg3, unsigned long arg4,
unsigned long arg5);
void (*task_reparent_to_init) (struct task_struct * p);
+ int (*task_lookup)(struct task_struct *p);
void (*task_to_inode)(struct task_struct *p, struct inode *inode);

int (*ipc_permission) (struct kern_ipc_perm * ipcp, short flag);
@@ -1751,6 +1757,11 @@
security_ops->task_reparent_to_init (p);
}

+static inline int security_task_lookup(struct task_struct *p)
+{
+ return security_ops->task_lookup(p);
+}
+
static inline void security_task_to_inode(struct task_struct *p, struct inode *inode)
{
security_ops->task_to_inode(p, inode);
@@ -2386,6 +2397,11 @@
cap_task_reparent_to_init (p);
}

+static inline int security_task_lookup(struct task_struct *p)
+{
+ return 0;
+}
+
static inline void security_task_to_inode(struct task_struct *p, struct inode *inode)
{ }

diff -Nru linux-2.6.8.1/security/dummy.c linux-2.6.8.1-jail/security/dummy.c
--- linux-2.6.8.1/security/dummy.c 2004-08-14 05:54:51.000000000 -0500
+++ linux-2.6.8.1-jail/security/dummy.c 2004-09-01 04:42:26.000000000 -0500
@@ -616,6 +616,11 @@
return;
}

+static int dummy_task_lookup(struct task_struct *p)
+{
+ return 0;
+}
+
static void dummy_task_to_inode(struct task_struct *p, struct inode *inode)
{ }

@@ -978,6 +983,7 @@
set_to_dummy_if_null(ops, task_kill);
set_to_dummy_if_null(ops, task_prctl);
set_to_dummy_if_null(ops, task_reparent_to_init);
+ set_to_dummy_if_null(ops, task_lookup);
set_to_dummy_if_null(ops, task_to_inode);
set_to_dummy_if_null(ops, ipc_permission);
set_to_dummy_if_null(ops, msg_msg_alloc_security);
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