linux-kernel - Re: [PATCH net-next 2/3] xen-netback: switch state to InitWait at the end of netback

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:   Tue, 17 Dec 2019 15:23:15 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Paul Durrant <pdurrant@...zon.com>
Cc:     xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Wei Liu <wei.liu@...nel.org>,
        Paul Durrant <paul@....org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 2/3] xen-netback: switch state to InitWait at
 the end of netback_probe()...

On Tue, Dec 17, 2019 at 01:32:17PM +0000, Paul Durrant wrote:
> ...as the comment above the function states.
> 
> The switch to Initialising at the start of the function is somewhat bogus
> as the toolstack will have set that initial state anyway. To behave
> correctly, a backend should switch to InitWait once it has set up all
> xenstore values that may be required by a initialising frontend. This
> patch calls backend_switch_state() to make the transition at the
> appropriate point.
> 
> NOTE: backend_switch_state() ignores errors from xenbus_switch_state()
>       and so this patch removes an error path from netback_probe(). This
>       means a failure to change state at this stage (in the absence of
>       other failures) will leave the device instantiated. This is highly
>       unlikley to happen as a failure to change state would indicate a
>       failure to write to xenstore, and that will trigger other error
>       paths. Also, a 'stuck' device can still be cleaned up using 'unbind'
>       in any case.
> 
> Signed-off-by: Paul Durrant <pdurrant@...zon.com>

Acked-by: Wei Liu <wei.liu@...nel.org>