[lkml]   [2018]   [Sep]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH net V2] vhost-vsock: fix use after free

On 2018年09月28日 01:04, Michael S. Tsirkin wrote:
> On Thu, Sep 27, 2018 at 08:22:04PM +0800, Jason Wang wrote:
>> The access of vsock is not protected by vhost_vsock_lock. This may
>> lead to use after free since vhost_vsock_dev_release() may free the
>> pointer at the same time.
>> Fix this by holding the lock during the access.
>> Fixes: 16320f363ae1 ("vhost-vsock: add pkt cancel capability")
>> Fixes: 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko")
>> Cc: Stefan Hajnoczi<>
>> Signed-off-by: Jason Wang<>
> Wow is that really the best we can do?

For net/stable, probably yes.

> A global lock on a data path
> operation?

It's already there, and the patch only increase the critical section.

> Granted use after free is nasty but Stefan said he sees
> a way to fix it using a per socket refcount. He's on vacation
> until Oct 4 though ...

Stefan has acked the pacth, so I think it's ok? We can do optimization
for -next on top.


 \ /
  Last update: 2018-09-28 01:38    [W:0.066 / U:0.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site