[PATCH] binder: fix possible UAF when freeing buffer
tkjos at google.com
Thu Jun 13 15:43:59 UTC 2019
On Wed, Jun 12, 2019 at 10:41 PM Greg KH <gregkh at linuxfoundation.org> wrote:
> On Wed, Jun 12, 2019 at 01:29:27PM -0700, Todd Kjos wrote:
> > There is a race between the binder driver cleaning
> > up a completed transaction via binder_free_transaction()
> > and a user calling binder_ioctl(BC_FREE_BUFFER) to
> > release a buffer. It doesn't matter which is first but
> > they need to be protected against running concurrently
> > which can result in a UAF.
> > Signed-off-by: Todd Kjos <tkjos at google.com>
> > ---
> > drivers/android/binder.c | 16 ++++++++++++++--
> > 1 file changed, 14 insertions(+), 2 deletions(-)
> Does this also need to go to the stable kernels?
This patch won't apply cleanly to stable kernels so I'll submit a new
patch directly to stable@ (4.14, 4.19) once this one lands.
> greg k-h
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