binder: use euid from cred instead of using task

BugLink: https://bugs.launchpad.net/bugs/1953387
commit 29bc22ac5e5bc63275e850f0c8fc549e3d0e306b upstream.

Save the 'struct cred' associated with a binder process
at initial open to avoid potential race conditions
when converting to an euid.

Set a transaction's sender_euid from the 'struct cred'
saved at binder_open() instead of looking up the euid
from the binder proc's 'struct task'. This ensures
the euid is associated with the security context that
of the task that opened binder.

Cc: stable@vger.kernel.org # 4.4+
Fixes: 457b9a6f09f0 ("Staging: android: add binder driver")
Signed-off-by: Todd Kjos <tkjos@google.com>
Suggested-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Suggested-by: Jann Horn <jannh@google.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 88bf3e2d65554e689d88a94740520514350928ae..0039937d2ae4caa234458bef8483558adecf971a 100644 (file)
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -424,6 +424,9 @@ enum binder_deferred_state {
  *                        (invariant after initialized)
  * @tsk                   task_struct for group_leader of process
  *                        (invariant after initialized)
+ * @cred                  struct cred associated with the `struct file`
+ *                        in binder_open()
+ *                        (invariant after initialized)
  * @deferred_work_node:   element for binder_deferred_list
  *                        (protected by binder_deferred_lock)
  * @deferred_work:        bitmap of deferred work to perform
@@ -469,6 +472,7 @@ struct binder_proc {
        struct list_head waiting_threads;
        int pid;
        struct task_struct *tsk;
+       const struct cred *cred;
        struct hlist_node deferred_work_node;
        int deferred_work;
        bool is_dead;
@@ -3091,7 +3095,7 @@ static void binder_transaction(struct binder_proc *proc,
                t->from = thread;
        else
                t->from = NULL;
-       t->sender_euid = task_euid(proc->tsk);
+       t->sender_euid = proc->cred->euid;
        t->to_proc = target_proc;
        t->to_thread = target_thread;
        t->code = tr->code;
@@ -4707,6 +4711,7 @@ static void binder_free_proc(struct binder_proc *proc)
        }
        binder_alloc_deferred_release(&proc->alloc);
        put_task_struct(proc->tsk);
+       put_cred(proc->cred);
        binder_stats_deleted(BINDER_STAT_PROC);
        kfree(proc);
 }
@@ -5234,6 +5239,7 @@ static int binder_open(struct inode *nodp, struct file *filp)
        spin_lock_init(&proc->outer_lock);
        get_task_struct(current->group_leader);
        proc->tsk = current->group_leader;
+       proc->cred = get_cred(filp->f_cred);
        INIT_LIST_HEAD(&proc->todo);
        proc->default_priority = task_nice(current);
        /* binderfs stashes devices in i_private */