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

Herbert Xu herbert at gondor.apana.org.au
Fri Mar 6 12:51:21 AEDT 2020

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 at intel.com>
> Signed-off-by: Zhangfei Gao <zhangfei.gao at linaro.org>
> ---
>  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.
Email: Herbert Xu <herbert at gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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