From: zhangfei <zhangfei.gao@linaro.org>
To: Xu Zaibo <xuzaibo@huawei.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>,
Herbert Xu <herbert@gondor.apana.org.au>,
jonathan.cameron@huawei.com, dave.jiang@intel.com,
grant.likely@arm.com, jean-philippe <jean-philippe@linaro.org>,
Jerome Glisse <jglisse@redhat.com>,
ilias.apalodimas@linaro.org, francois.ozog@linaro.org,
kenneth-lee-2012@foxmail.com, Wangzhou <wangzhou1@hisilicon.com>,
"haojian . zhuang" <haojian.zhuang@linaro.org>,
guodong.xu@linaro.org
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
linux-accelerators@lists.ozlabs.org,
linux-crypto@vger.kernel.org
Subject: Re: [PATCH] uacce: unmap remaining mmapping from user space
Date: Tue, 25 Feb 2020 16:33:37 +0800 [thread overview]
Message-ID: <cf1f7ec2-7181-63fd-598d-b74d5a3efa15@linaro.org> (raw)
In-Reply-To: <a4716453-0607-d613-e632-173d1ebc424e@huawei.com>
Hi, Zaibo
On 2020/2/24 下午3:17, Xu Zaibo wrote:
>> @@ -585,6 +595,13 @@ void uacce_remove(struct uacce_device *uacce)
>> cdev_device_del(uacce->cdev, &uacce->dev);
>> xa_erase(&uacce_xa, uacce->dev_id);
>> put_device(&uacce->dev);
>> +
>> + /*
>> + * unmap remainning mapping from user space, preventing user still
>> + * access the mmaped area while parent device is already removed
>> + */
>> + if (uacce->inode)
>> + unmap_mapping_range(uacce->inode->i_mapping, 0, 0, 1);
> Should we unmap them at the first of 'uacce_remove', and before
> 'uacce_put_queue'?
>
We can do this,
Though it does not matter, since user space can not interrupt kernel
function uacce_remove.
Thanks
WARNING: multiple messages have this Message-ID (diff)
From: zhangfei <zhangfei.gao@linaro.org>
To: Xu Zaibo <xuzaibo@huawei.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>,
Herbert Xu <herbert@gondor.apana.org.au>,
jonathan.cameron@huawei.com, dave.jiang@intel.com,
grant.likely@arm.com, jean-philippe <jean-philippe@linaro.org>,
Jerome Glisse <jglisse@redhat.com>,
ilias.apalodimas@linaro.org, francois.ozog@linaro.org,
kenneth-lee-2012@foxmail.com, Wangzhou <wangzhou1@hisilicon.com>,
"haojian . zhuang" <haojian.zhuang@linaro.org>,
guodong.xu@linaro.org
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
linux-accelerators@lists.ozlabs.org,
linux-crypto@vger.kernel.org
Subject: Re: [PATCH] uacce: unmap remaining mmapping from user space
Date: Tue, 25 Feb 2020 16:33:37 +0800 [thread overview]
Message-ID: <cf1f7ec2-7181-63fd-598d-b74d5a3efa15@linaro.org> (raw)
In-Reply-To: <a4716453-0607-d613-e632-173d1ebc424e@huawei.com>
Hi, Zaibo
On 2020/2/24 下午3:17, Xu Zaibo wrote:
>> @@ -585,6 +595,13 @@ void uacce_remove(struct uacce_device *uacce)
>> cdev_device_del(uacce->cdev, &uacce->dev);
>> xa_erase(&uacce_xa, uacce->dev_id);
>> put_device(&uacce->dev);
>> +
>> + /*
>> + * unmap remainning mapping from user space, preventing user still
>> + * access the mmaped area while parent device is already removed
>> + */
>> + if (uacce->inode)
>> + unmap_mapping_range(uacce->inode->i_mapping, 0, 0, 1);
> Should we unmap them at the first of 'uacce_remove', and before
> 'uacce_put_queue'?
>
We can do this,
Though it does not matter, since user space can not interrupt kernel
function uacce_remove.
Thanks
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iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-02-25 8:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-24 7:06 [PATCH] uacce: unmap remaining mmapping from user space Zhangfei Gao
2020-02-24 7:06 ` Zhangfei Gao
2020-02-24 7:17 ` Xu Zaibo
2020-02-24 7:17 ` Xu Zaibo
2020-02-25 8:33 ` zhangfei [this message]
2020-02-25 8:33 ` zhangfei
2020-02-25 9:13 ` Xu Zaibo
2020-02-25 9:13 ` Xu Zaibo
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