linux-kernel - Re: [PATCH 2/2] scsi:target:tcmu: reduce once copy by using uio ioctl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 17 Feb 2022 11:15:11 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Guixin Liu <kanie@...ux.alibaba.com>
Cc:     bostroesser@...il.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, xiaoguang.wang@...ux.alibaba.com,
        xlpang@...ux.alibaba.com
Subject: Re: [PATCH 2/2] scsi:target:tcmu: reduce once copy by using uio ioctl

On Thu, Feb 17, 2022 at 10:29:22AM +0800, Guixin Liu wrote:
> --- a/include/uapi/linux/target_core_user.h
> +++ b/include/uapi/linux/target_core_user.h
> @@ -185,4 +185,13 @@ enum tcmu_genl_attr {
>  };
>  #define TCMU_ATTR_MAX (__TCMU_ATTR_MAX - 1)
>  
> +struct tcmu_data_xfer {
> +	unsigned short cmd_id;
> +	unsigned long iov_cnt;
> +	struct iovec __user *iovec;
> +};

That is no way to define a structure that crosses the user/kernel
boundry, it just will not work at all, even if we wanted it to :(

sorry,

greg k-h