From: Jason Gunthorpe <jgg@ziepe.ca>
To: Vinit Agnihotri <vinita@ryussi.com>
Cc: linux-rdma@vger.kernel.org
Subject: Re: [question] ibv_reg_mr() returning EACCESS
Date: Fri, 15 Nov 2019 10:12:10 -0400 [thread overview]
Message-ID: <20191115141210.GC4055@ziepe.ca> (raw)
In-Reply-To: <141f4c07-b7f1-1355-7ff7-d62605ee63b5@ryussi.com>
On Fri, Nov 15, 2019 at 09:27:40AM +0530, Vinit Agnihotri wrote:
> Hi,
>
> I am trying to use setfsgid()/setfssid() calls to ensure proper access check
> for linux users.
>
> However if user is non-root then ibv_reg_mr() returns EACCESS. While I am
> sure I am calling ibv_reg_mr()
>
> as root user, not sure why it still returns EACCESS.
>
> While going through libibverbs sources I realize EACCESS might be returned
> by this call:
>
> if (write(pd->context->cmd_fd, cmd, cmd_size) != cmd_size)
> return errno;
>
> Can anyone provide any insight into this behavior? Does calling these
> systems calls in threads can affect
>
> entire process? I checked /dev/infiniband/* has appropriate privileges.
This is a security limitation, if you want do this flow you need a new
enough kernel and rdma-core to support the ioctl() scheme for calling
verbs
Jason
next prev parent reply other threads:[~2019-11-15 14:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 3:57 [question] ibv_reg_mr() returning EACCESS Vinit Agnihotri
2019-11-15 14:12 ` Jason Gunthorpe [this message]
2019-11-18 4:59 ` Vinit Agnihotri
2019-11-19 23:34 ` Jason Gunthorpe
2019-11-20 4:05 ` Vinit Agnihotri
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