netdev - Re: [PATCH 1/3] tools/virtio: fix READ

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]

Message-ID: <8d6adf36-eff2-f698-8602-b1fe62c9d3bf@redhat.com>
Date:   Fri, 25 Nov 2016 10:38:42 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org
Cc:     dave@...olabs.net, dbueso@...e.de, dvyukov@...gle.com,
        kvm@...r.kernel.org, mst@...hat.com, netdev@...r.kernel.org,
        paulmck@...ux.vnet.ibm.com,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 1/3] tools/virtio: fix READ_ONCE()



On 2016年11月24日 18:25, Mark Rutland wrote:
> The virtio tools implementation of READ_ONCE() has a single parameter called
> 'var', but erroneously refers to 'val' for its cast, and thus won't work unless
> there's a variable of the correct type that happens to be called 'var'.
>
> Fix this with s/var/val/, making READ_ONCE() work as expected regardless.
>
> Fixes: a7c490333df3cff5 ("tools/virtio: use virt_xxx barriers")
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: linux-kernel@...r.kernel.org
> Cc: virtualization@...ts.linux-foundation.org
> ---
>   tools/virtio/linux/compiler.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/virtio/linux/compiler.h b/tools/virtio/linux/compiler.h
> index 845960e..c9ccfd4 100644
> --- a/tools/virtio/linux/compiler.h
> +++ b/tools/virtio/linux/compiler.h
> @@ -4,6 +4,6 @@
>   #define WRITE_ONCE(var, val) \
>   	(*((volatile typeof(val) *)(&(var))) = (val))
>   
> -#define READ_ONCE(var) (*((volatile typeof(val) *)(&(var))))
> +#define READ_ONCE(var) (*((volatile typeof(var) *)(&(var))))
>   
>   #endif

Reviewed-by: Jason Wang <jasowang@...hat.com>