diff mbox series

[v3,3/3] binder: use euid from cred instead of using task

Message ID 20211006194610.953319-4-tkjos@google.com (mailing list archive)
State New, archived
Headers show
Series binder: use cred instead of task for security context | expand

Commit Message

Todd Kjos Oct. 6, 2021, 7:46 p.m. UTC
Set a transaction's sender_euid from the 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.

Fixes: 457b9a6f09f0 ("Staging: android: add binder driver")
Signed-off-by: Todd Kjos <tkjos@google.com>
Stephen Smalley <stephen.smalley.work@gmail.com>
Cc: stable@vger.kernel.org # 4.4+
---
v3: added this patch to series

 drivers/android/binder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Todd Kjos Oct. 6, 2021, 7:55 p.m. UTC | #1
On Wed, Oct 6, 2021 at 12:46 PM Todd Kjos <tkjos@google.com> wrote:
>
> Set a transaction's sender_euid from the 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.
>
> Fixes: 457b9a6f09f0 ("Staging: android: add binder driver")
> Signed-off-by: Todd Kjos <tkjos@google.com>
> Stephen Smalley <stephen.smalley.work@gmail.com>

This should have been "Suggested-by: Stephen Smalley
<stephen.smalley.work@gmail.com>"

> Cc: stable@vger.kernel.org # 4.4+
> ---
> v3: added this patch to series
>
>  drivers/android/binder.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index 989afd0804ca..26382e982c5e 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -2711,7 +2711,7 @@ 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;
> --
> 2.33.0.800.g4c38ced690-goog
>
Todd Kjos Oct. 6, 2021, 8:38 p.m. UTC | #2
On Wed, Oct 6, 2021 at 12:55 PM Todd Kjos <tkjos@google.com> wrote:
>
> On Wed, Oct 6, 2021 at 12:46 PM Todd Kjos <tkjos@google.com> wrote:
> >
> > Set a transaction's sender_euid from the the 'struct cred'

Sigh...and I forgot to run checkpatch before submitting which would
have caught this "the the"

> > 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.
> >
> > Fixes: 457b9a6f09f0 ("Staging: android: add binder driver")
> > Signed-off-by: Todd Kjos <tkjos@google.com>
> > Stephen Smalley <stephen.smalley.work@gmail.com>
>
> This should have been "Suggested-by: Stephen Smalley
> <stephen.smalley.work@gmail.com>"
>
> > Cc: stable@vger.kernel.org # 4.4+
> > ---
> > v3: added this patch to series
> >
> >  drivers/android/binder.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> > index 989afd0804ca..26382e982c5e 100644
> > --- a/drivers/android/binder.c
> > +++ b/drivers/android/binder.c
> > @@ -2711,7 +2711,7 @@ 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;
> > --
> > 2.33.0.800.g4c38ced690-goog
> >
diff mbox series

Patch

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 989afd0804ca..26382e982c5e 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2711,7 +2711,7 @@  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;