Re: [Qemu-devel] [PATCH v2 03/45] ivhsmem: read do not accept more than sizeof(long)

[Paolo Bonzini <pbonzini@redhat.com>]

On 28/07/2015 02:32, Marc-André Lureau wrote:
> From: Marc-André Lureau <marcandre.lureau@gmail.com>
> 
> ivshmem_read() only reads sizeof(long) from the input buffer.  Accepting
> more could lead to fifo8 abort() on x86 if it's not empty.
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>  hw/misc/ivshmem.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
> index cc76989..fb53b3f 100644
> --- a/hw/misc/ivshmem.c
> +++ b/hw/misc/ivshmem.c
> @@ -272,7 +272,7 @@ static void ivshmem_receive(void *opaque, const uint8_t *buf, int size)
>  
>  static int ivshmem_can_receive(void * opaque)
>  {
> -    return 8;
> +    return sizeof(long);
>  }
>  
>  static void ivshmem_event(void *opaque, int event)
> -- 2.4.3

I would prefer to change all longs to uint64_t, to avoid a dependency on
the host long size.  Even better one could have uint32_t for the id plus
a flags value that for now would always be zero.

Paolo