Re: [PATCH v2] uacce: unmap remaining mmapping from user space

[zhangfei]

On 2020/3/6 äå9:51, Herbert Xu wrote:
> On Wed, Feb 26, 2020 at 03:12:06PM +0800, Zhangfei Gao wrote:
> > When uacce parent device module is removed, user app may
> > still keep the mmaped area, which can be accessed unsafely.
> > When rmmod, Parent device driver will call uacce_remove,
> > which unmap all remaining mapping from user space for safety.
> > VM_FAULT_SIGBUS is also reported to user space accordingly.
> >
> > Suggested-by: Dave Jiang <dave.jiang@xxxxxxxxx>
> > Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
> > ---
> >   v2: Unmap before put_queue, where memory is freed, commented from Zaibo.
> >
> >   drivers/misc/uacce/uacce.c | 16 ++++++++++++++++
> >   include/linux/uacce.h      |  2 ++
> >   2 files changed, 18 insertions(+)
> Patch applied.  Thanks.
Thanks Herbert for the help.