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Re: [Qemu-devel] [PATCH] linux-user/syscall.c: Let lv always match val i
From: |
Laurent Vivier |
Subject: |
Re: [Qemu-devel] [PATCH] linux-user/syscall.c: Let lv always match val in do_getsockopt() |
Date: |
Thu, 14 Jan 2016 10:41:25 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 |
Le 14/01/2016 10:37, Chen Gang a écrit :
>
> On 2016年01月14日 17:10, Laurent Vivier wrote:
>>
>> Le 14/01/2016 10:01, Chen Gang a écrit :
>>>
>>> I am not quite sure whether kernel always returns sizeof(int) (I guess,
>>> it should be).
>>
>> it can be 1 only if len is 1, but this is managed below.
>>
>
> Excuse me, I do not quite understand your meaning.
>
> For me, if we are sure lv is always 4 for SO_TYPE, we don't need this
> patch.
>
> If lv may be 1 for SO_TYPE (it means val >> 8 may be zero), after call
> host_to_target_sock_type, val >> 8 may be non-zero, theoretically. In
> this case, we need modify lv to 4.
>
>>> For me, if you are sure, we can skip this patch.
>>
>> Does it fix something ?
>>
>
> It is only theoretical, not real world, at present.
So I think we can skip it.
Laurent