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

[Michal Privoznik]

On 17.07.2013 11:43, Daniel P. Berrange wrote:
> 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
> 

Ugrh, yes.