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Re: [libvirt] [PATCH] dont't crash in virsh dominfo <domain>



On Wed, Mar 17, 2010 at 09:11:07PM +0100, Guido Günther wrote:
> Hi,
> 
> virsh dominfo domain crashes with:
> 
> #0  strlen () at ../sysdeps/i386/i486/strlen.S:69
> #1  0x080891c9 in qemudNodeGetSecurityModel (conn=0x8133940, secmodel=0xb5676ede) at qemu/qemu_driver.c:4911
> #2  0xb7eb5623 in virNodeGetSecurityModel (conn=0x8133940, secmodel=0x0) at libvirt.c:5118
> #3  0x0806767a in remoteDispatchNodeGetSecurityModel (server=0x8118888, client=0x8134080, conn=0x8133940, hdr=0x81a8388, rerr=0xb56771d8, args=0xb56771a0, ret=0xb5677144) at remote.c:1306
> #4  0x08068acc in remoteDispatchClientCall (server=0x8118888, client=0x8134080, msg=0x8168378) at dispatch.c:506
> #5  0x08068ee3 in remoteDispatchClientRequest (server=0x8118888, client=0x8134080, msg=0x8168378) at dispatch.c:388
> #6  0x0805baba in qemudWorker (data=0x811de2c) at libvirtd.c:1528
> #7  0xb7bb8585 in start_thread (arg=0xb5677b70) at pthread_create.c:300
> #8  0xb7b3a29e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
> 
> if there's no primary security driver set since we only intialize the
> secmodel.model and secmodel.doi if we have one. Attached patch checks
> for primarySecurityDriver instead of securityDriver since the later is
> always set in qemudSecurityInit().
> Cheers,
>  -- Guido

> >From 1d26ec760739b0ea17d1b29730dbdb5632d3565c Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?Guido=20G=C3=BCnther?= <agx sigxcpu org>
> Date: Wed, 17 Mar 2010 21:04:11 +0100
> Subject: [PATCH] Don't crash without a security driver
> 
> "virsh dominfo <vm>" crashes if there's no primary security driver set
> since we only intialize the secmodel.model and secmodel.doi if we have
> one. Attached patch checks for securityPrimaryDriver instead of
> securityDriver since the later is always set in qemudSecurityInit().
> 
> Closes: http://bugs.debian.org/574359
> ---
>  src/qemu/qemu_driver.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 67d9ade..e26c591 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -4956,7 +4956,7 @@ static int qemudNodeGetSecurityModel(virConnectPtr conn,
>      int ret = 0;
>  
>      qemuDriverLock(driver);
> -    if (!driver->securityDriver) {
> +    if (!driver->securityPrimaryDriver) {
>          memset(secmodel, 0, sizeof (*secmodel));
>          goto cleanup;
>      }
> -- 
> 1.7.0

  That looks fine to me, but I would prefer if Dan can double check :-)

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel veillard com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/


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