[libvirt] [PATCH] lxc_container: Don't call virGetGroupList during exec

[Daniel P. Berrange]

On Wed, Jul 17, 2013 at 11:28:42AM +0200, Michal Privoznik wrote:
> Commit 75c1256 states that virGetGroupList must not be called
> between fork and exec, then commit ee777e99 promptly violated
> that for lxc.
> 
> Patch originally posted by Eric Blake <eblake at redhat.com>.
> ---
>  src/lxc/lxc_container.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
> index b51d7a2..37d2ba6 100644
> --- a/src/lxc/lxc_container.c
> +++ b/src/lxc/lxc_container.c
> @@ -351,24 +351,18 @@ int lxcContainerWaitForContinue(int control)
>   */
>  static int lxcContainerSetID(virDomainDefPtr def)
>  {
> -    gid_t *groups;
> -    int ngroups;
> -
>      /* Only call virSetUIDGID when user namespace is enabled
>       * for this container. And user namespace is only enabled
>       * when nuidmap&ngidmap is not zero */
>  
>      VIR_DEBUG("Set UID/GID to 0/0");
>      if (def->idmap.nuidmap &&
> -        ((ngroups = virGetGroupList(0, 0, &groups) < 0) ||
> -         virSetUIDGID(0, 0, groups, ngroups) < 0)) {
> +        virSetUIDGID(0, 0, groups, ngroups) < 0) {

How does this compile ? You're removing the 'groups' and 'ngroups'
variables but still referencing them here. Don't you mean to use
NULL, 0 as the args for virSetUIDGID }

Daniel
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