tree ba89830a7f59019799eea92389a1a31f927c05df
parent b240021823c260d3ebd67feb2f950355a3dc7b3c
author Todd Kjos <tkjos@google.com> 1636585236 -0800
committer Todd Kjos <tkjos@google.com> 1641516926 -0800

BACKPORT: binder: use cred instead of task for getsecid

commit 4d5b5539742d2554591751b4248b0204d20dcc9d upstream.

Use the 'struct cred' saved at binder_open() to lookup
the security ID via security_cred_getsecid(). This
ensures that the security context that opened binder
is the one used to generate the secctx.

Cc: stable@vger.kernel.org # 5.4+
Fixes: ec74136ded79 ("binder: create node flag to request sender's security context")
Signed-off-by: Todd Kjos <tkjos@google.com>
Suggested-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Reported-by: kernel test robot <lkp@intel.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>
Change-Id: Ib37f1b1d6bc4da214887e3305a9c348c25904c2a