[PATCH] binder: fix test regression due to sender_euid change

[PATCH] binder: fix test regression due to sender_euid change

[Todd Kjos]

This is a partial revert of commit
29bc22ac5e5b ("binder: use euid from cred instead of using task").
Setting sender_euid using proc->cred caused some Android system test
regressions that need further investigation. It is a partial
reversion because subsequent patches rely on proc->cred.

Cc: stable@vger.kernel.org # 4.4+
Fixes: 29bc22ac5e5b ("binder: use euid from cred instead of using task")
Signed-off-by: Todd Kjos <tkjos@google.com>
Change-Id: I9b1769a3510fed250bb21859ef8beebabe034c66
---
- the issue was introduced in 5.16-rc1, so please apply to 5.16
- this should apply cleanly to all stable branches back to 4.4
  that contain "binder: use euid from cred instead of using task"


 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 49fb74196d02..cffbe57a8e08 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2710,7 +2710,7 @@ static void binder_transaction(struct binder_proc *proc,
 		t->from = thread;
 	else
 		t->from = NULL;
-	t->sender_euid = proc->cred->euid;
+	t->sender_euid = task_euid(proc->tsk);
 	t->to_proc = target_proc;
 	t->to_thread = target_thread;
 	t->code = tr->code;
-- 
2.34.0.rc1.387.gb447b232ab-goog

Re: [PATCH] binder: fix test regression due to sender_euid change

[Christian Brauner]

On Fri, Nov 12, 2021 at 10:07:20AM -0800, Todd Kjos wrote:
> This is a partial revert of commit
> 29bc22ac5e5b ("binder: use euid from cred instead of using task").
> Setting sender_euid using proc->cred caused some Android system test
> regressions that need further investigation. It is a partial
> reversion because subsequent patches rely on proc->cred.
> 
> Cc: stable@vger.kernel.org # 4.4+
> Fixes: 29bc22ac5e5b ("binder: use euid from cred instead of using task")
> Signed-off-by: Todd Kjos <tkjos@google.com>
> Change-Id: I9b1769a3510fed250bb21859ef8beebabe034c66
> ---

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>

Re: [PATCH] binder: fix test regression due to sender_euid change

[Paul Moore]

On Fri, Nov 12, 2021 at 1:07 PM Todd Kjos <tkjos@google.com> wrote:
>
> This is a partial revert of commit
> 29bc22ac5e5b ("binder: use euid from cred instead of using task").
> Setting sender_euid using proc->cred caused some Android system test
> regressions that need further investigation. It is a partial
> reversion because subsequent patches rely on proc->cred.
>
> Cc: stable@vger.kernel.org # 4.4+
> Fixes: 29bc22ac5e5b ("binder: use euid from cred instead of using task")
> Signed-off-by: Todd Kjos <tkjos@google.com>
> Change-Id: I9b1769a3510fed250bb21859ef8beebabe034c66
> ---
> - the issue was introduced in 5.16-rc1, so please apply to 5.16
> - this should apply cleanly to all stable branches back to 4.4
>   that contain "binder: use euid from cred instead of using task"
>
>
>  drivers/android/binder.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

This looks okay to me.  I assume this is going in via GregKH's tree?

Acked-by: Paul Moore <paul@paul-moore.com>

> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index 49fb74196d02..cffbe57a8e08 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -2710,7 +2710,7 @@ static void binder_transaction(struct binder_proc *proc,
>                 t->from = thread;
>         else
>                 t->from = NULL;
> -       t->sender_euid = proc->cred->euid;
> +       t->sender_euid = task_euid(proc->tsk);
>         t->to_proc = target_proc;
>         t->to_thread = target_thread;
>         t->code = tr->code;
> --
> 2.34.0.rc1.387.gb447b232ab-goog

-- 
paul moore
www.paul-moore.com

Re: [PATCH] binder: fix test regression due to sender_euid change

[Todd Kjos]

On Fri, Nov 19, 2021 at 3:00 PM Paul Moore <paul@paul-moore.com> wrote:
>
> On Fri, Nov 12, 2021 at 1:07 PM Todd Kjos <tkjos@google.com> wrote:
> >
> > This is a partial revert of commit
> > 29bc22ac5e5b ("binder: use euid from cred instead of using task").
> > Setting sender_euid using proc->cred caused some Android system test
> > regressions that need further investigation. It is a partial
> > reversion because subsequent patches rely on proc->cred.
> >
> > Cc: stable@vger.kernel.org # 4.4+
> > Fixes: 29bc22ac5e5b ("binder: use euid from cred instead of using task")
> > Signed-off-by: Todd Kjos <tkjos@google.com>
> > Change-Id: I9b1769a3510fed250bb21859ef8beebabe034c66

Greg, I neglected to remove the "Change-Id" from my Android pre-submit
testing. Can you remove that, or would you like me to resubmit without
it?

> > ---
> > - the issue was introduced in 5.16-rc1, so please apply to 5.16
> > - this should apply cleanly to all stable branches back to 4.4
> >   that contain "binder: use euid from cred instead of using task"
> >
> >
> >  drivers/android/binder.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
>
> This looks okay to me.  I assume this is going in via GregKH's tree?
>
> Acked-by: Paul Moore <paul@paul-moore.com>
>
> > diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> > index 49fb74196d02..cffbe57a8e08 100644
> > --- a/drivers/android/binder.c
> > +++ b/drivers/android/binder.c
> > @@ -2710,7 +2710,7 @@ static void binder_transaction(struct binder_proc *proc,
> >                 t->from = thread;
> >         else
> >                 t->from = NULL;
> > -       t->sender_euid = proc->cred->euid;
> > +       t->sender_euid = task_euid(proc->tsk);
> >         t->to_proc = target_proc;
> >         t->to_thread = target_thread;
> >         t->code = tr->code;
> > --
> > 2.34.0.rc1.387.gb447b232ab-goog
>
> --
> paul moore
> www.paul-moore.com

Re: [PATCH] binder: fix test regression due to sender_euid change

[Greg KH]

On Fri, Nov 19, 2021 at 03:39:59PM -0800, Todd Kjos wrote:
> On Fri, Nov 19, 2021 at 3:00 PM Paul Moore <paul@paul-moore.com> wrote:
> >
> > On Fri, Nov 12, 2021 at 1:07 PM Todd Kjos <tkjos@google.com> wrote:
> > >
> > > This is a partial revert of commit
> > > 29bc22ac5e5b ("binder: use euid from cred instead of using task").
> > > Setting sender_euid using proc->cred caused some Android system test
> > > regressions that need further investigation. It is a partial
> > > reversion because subsequent patches rely on proc->cred.
> > >
> > > Cc: stable@vger.kernel.org # 4.4+
> > > Fixes: 29bc22ac5e5b ("binder: use euid from cred instead of using task")
> > > Signed-off-by: Todd Kjos <tkjos@google.com>
> > > Change-Id: I9b1769a3510fed250bb21859ef8beebabe034c66
> 
> Greg, I neglected to remove the "Change-Id" from my Android pre-submit
> testing. Can you remove that, or would you like me to resubmit without
> it?

Sorry, I missed it too.  It's already in my tree, no need to worry about
it.

greg k-h