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Re: [Qemu-devel] [Nbd] [PATCH] nbd: fix trim/discard commands with a len

From: Alex Bligh
Subject: Re: [Qemu-devel] [Nbd] [PATCH] nbd: fix trim/discard commands with a length bigger than NBD_MAX_BUFFER_SIZE
Date: Thu, 12 May 2016 16:33:25 +0100

On 11 May 2016, at 22:12, Wouter Verhelst <address@hidden> wrote:

> On Tue, May 10, 2016 at 04:38:29PM +0100, Alex Bligh wrote:
>> On 10 May 2016, at 16:29, Eric Blake <address@hidden> wrote:
>>> So the kernel is currently one of the clients that does NOT honor block
>>> sizes, and as such, servers should be prepared for ANY size up to
>>> UINT_MAX (other than DoS handling).
>> Or not to permit a connection.
> Right -- and this is why I was recommending against making this a MUST in the
> first place.

Indeed, and it currently is a 'MAY':

> except that if a server believes a client's behaviour constitutes
> a denial of service, it MAY initiate a hard disconnect.

Alex Bligh

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