linux-kernel - Re: [PATCH 3.2 31/46] IB/security: Restrict use of the write() interface

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Message-ID: <57607309.3000600@gmail.com>
Date:	Tue, 14 Jun 2016 22:11:37 +0100
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Doug Ledford <dledford@...hat.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Jann Horn <jann@...jh.net>
Subject: Re: [PATCH 3.2 31/46] IB/security: Restrict use of the write() interface

On Sunday 12 June 2016 10:34 PM, Ben Hutchings wrote:
> 3.2.81-rc1 review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
>
> commit e6bd18f57aad1a2d1ef40e646d03ed0f2515c9e3 upstream.
>
> The drivers/infiniband stack uses write() as a replacement for
> bi-directional ioctl().  This is not safe. There are ways to
> trigger write calls that result in the return structure that
> is normally written to user space being shunted off to user
> specified kernel memory instead.
>

<snip>

> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
> --- a/drivers/infiniband/core/ucm.c
> +++ b/drivers/infiniband/core/ucm.c
> @@ -48,6 +48,7 @@
>
>   #include <asm/uaccess.h>
>
> +#include <rdma/ib.h>

This is breaking the build. There is no rdma/ib.h . The file was created by:
8d36eb01da5d ("RDMA/cma: Define native IB address")

build log is at: https://gitlab.com/sudipm/linux-next/builds/1771265

Regards
Sudip