On 2020/3/6 上午9:51, 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.
