On Tue, Jun 15, 2021 at 12:33 AM Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx> wrote: > > The shm cache could contain invalid addresses if > optee_disable_shm_cache() was not called from the .shutdown hook of the > previous kernel before a kexec. These addresses could be unmapped or > they could point to mapped but unintended locations in memory. > > Clear the shared memory cache, while being careful to not translate the > addresses returned from OPTEE_SMC_DISABLE_SHM_CACHE, during driver > initialization. Once all pre-cache shm objects are removed, proceed with > enabling the cache so that we know that we can handle cached shm objects > with confidence later in the .shutdown hook. > > Cc: stable@xxxxxxxxxxxxxxx > Signed-off-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx> > --- > drivers/tee/optee/call.c | 36 ++++++++++++++++++++++++++++--- > drivers/tee/optee/core.c | 9 ++++++++ > drivers/tee/optee/optee_private.h | 1 + > 3 files changed, 43 insertions(+), 3 deletions(-) Reviewed-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
