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Date: Fri, 15 Jun 2018 17:40:09 +0100
From: Al Viro <>
To: Jann Horn <>
Cc: Jens Axboe <>,
	FUJITA Tomonori <>,
	Doug Gilbert <>,
	"James E.J. Bottomley" <>,
	"Martin K. Petersen" <>,,,,,
Subject: Re: [PATCH] sg, bsg: mitigate read/write abuse, block uaccess in

On Fri, Jun 15, 2018 at 05:23:35PM +0200, Jann Horn wrote:

> I've mostly copypasted ib_safe_file_access() over as
> scsi_safe_file_access() because I couldn't find a good common header -
> please tell me if you know a better way.
> The duplicate pr_err_once() calls are so that each of them fires once;
> otherwise, this would probably have to be a macro.
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Cc: <>
> Signed-off-by: Jann Horn <>
> ---

WTF do you mean, in ->release()?  That makes no sense whatsoever -
what kind of copy_{to,from}_user() would be possible in there?

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