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authorStephen Smalley <sds@tycho.nsa.gov>2015-01-21 10:54:10 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-25 09:17:57 -0800
commit79af73079d753b2d04e46f7445716d3b5f914dbd (patch)
tree565ce3d58ccae8765fe13e20064b3ba48eaa0ebc /security/capability.c
parent79563db9ddd37908343103debf20da716ccc5ce4 (diff)
downloadlinux-79af73079d753b2d04e46f7445716d3b5f914dbd.tar.gz
Add security hooks to binder and implement the hooks for SELinux.
Add security hooks to the binder and implement the hooks for SELinux. The security hooks enable security modules such as SELinux to implement controls over binder IPC. The security hooks include support for controlling what process can become the binder context manager (binder_set_context_mgr), controlling the ability of a process to invoke a binder transaction/IPC to another process (binder_transaction), controlling the ability of a process to transfer a binder reference to another process (binder_transfer_binder), and controlling the ability of a process to transfer an open file to another process (binder_transfer_file). These hooks have been included in the Android kernel trees since Android 4.3. (Updated to reflect upstream relocation and changes to the binder driver, changes to the LSM audit data structures, coding style cleanups, and to add inline documentation for the hooks). Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Nick Kralevich <nnk@google.com> Acked-by: Jeffrey Vander Stoep <jeffv@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'security/capability.c')
-rw-r--r--security/capability.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/security/capability.c b/security/capability.c
index d68c57a62bcf..070dd46f62f4 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -12,6 +12,29 @@
#include <linux/security.h>
+static int cap_binder_set_context_mgr(struct task_struct *mgr)
+{
+ return 0;
+}
+
+static int cap_binder_transaction(struct task_struct *from,
+ struct task_struct *to)
+{
+ return 0;
+}
+
+static int cap_binder_transfer_binder(struct task_struct *from,
+ struct task_struct *to)
+{
+ return 0;
+}
+
+static int cap_binder_transfer_file(struct task_struct *from,
+ struct task_struct *to, struct file *file)
+{
+ return 0;
+}
+
static int cap_syslog(int type)
{
return 0;
@@ -930,6 +953,10 @@ static void cap_audit_rule_free(void *lsmrule)
void __init security_fixup_ops(struct security_operations *ops)
{
+ set_to_cap_if_null(ops, binder_set_context_mgr);
+ set_to_cap_if_null(ops, binder_transaction);
+ set_to_cap_if_null(ops, binder_transfer_binder);
+ set_to_cap_if_null(ops, binder_transfer_file);
set_to_cap_if_null(ops, ptrace_access_check);
set_to_cap_if_null(ops, ptrace_traceme);
set_to_cap_if_null(ops, capget);