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-rw-r--r--security/selinux/hooks.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 91b06f2aa963..520f82ab3fbf 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3277,6 +3277,50 @@ static void selinux_cred_commit(struct cred *new, const struct cred *old)
secondary_ops->cred_commit(new, old);
}
+/*
+ * set the security data for a kernel service
+ * - all the creation contexts are set to unlabelled
+ */
+static int selinux_kernel_act_as(struct cred *new, u32 secid)
+{
+ struct task_security_struct *tsec = new->security;
+ u32 sid = current_sid();
+ int ret;
+
+ ret = avc_has_perm(sid, secid,
+ SECCLASS_KERNEL_SERVICE,
+ KERNEL_SERVICE__USE_AS_OVERRIDE,
+ NULL);
+ if (ret == 0) {
+ tsec->sid = secid;
+ tsec->create_sid = 0;
+ tsec->keycreate_sid = 0;
+ tsec->sockcreate_sid = 0;
+ }
+ return ret;
+}
+
+/*
+ * set the file creation context in a security record to the same as the
+ * objective context of the specified inode
+ */
+static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
+{
+ struct inode_security_struct *isec = inode->i_security;
+ struct task_security_struct *tsec = new->security;
+ u32 sid = current_sid();
+ int ret;
+
+ ret = avc_has_perm(sid, isec->sid,
+ SECCLASS_KERNEL_SERVICE,
+ KERNEL_SERVICE__CREATE_FILES_AS,
+ NULL);
+
+ if (ret == 0)
+ tsec->create_sid = isec->sid;
+ return 0;
+}
+
static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
{
/* Since setuid only affects the current process, and
@@ -5593,6 +5637,8 @@ static struct security_operations selinux_ops = {
.cred_free = selinux_cred_free,
.cred_prepare = selinux_cred_prepare,
.cred_commit = selinux_cred_commit,
+ .kernel_act_as = selinux_kernel_act_as,
+ .kernel_create_files_as = selinux_kernel_create_files_as,
.task_setuid = selinux_task_setuid,
.task_fix_setuid = selinux_task_fix_setuid,
.task_setgid = selinux_task_setgid,