linux-kernel - Re: [PATCH 2/2] KVM, Fix QEMU-KVM is killed by guest SRAO MCE

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: <4BD80449.4010700@redhat.com>
Date:	Wed, 28 Apr 2010 12:47:53 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Huang Ying <ying.huang@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"masbock@...ux.vnet.ibm.com" <masbock@...ux.vnet.ibm.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/2] KVM, Fix QEMU-KVM is killed by guest SRAO MCE

On 04/28/2010 05:56 AM, Huang Ying wrote:
>    
>>>
>>> Just want to use the side effect of copy_from_user, SIGBUS will be sent
>>> to current process because the page touched is marked as poisoned. That
>>> is, failure is expected, so the return value is not checked.
>>>
>>>        
>> What if the failure doesn't happen?  Say, someone mmap()ed over the page.
>>      
> Sorry, not get your idea clearly. hva is re-mmap()ed? We just read the
> hva, not write, so I think it should be OK here.
>
>    

We don't generate a signal in this case.  Does the code continue to work 
correctly (not sure what correctly is in this case... should probably 
just continue).

There's also the possibility of -EFAULT.

-- 
error compiling committee.c: too many arguments to function

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/