Re: [LTP] [PATCH] syscalls/getgroups/getgroups01: set supplementary groups to prevent TCONF

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> From: "Han Pingtian" <hanpt@linux.vnet.ibm.com>
> To: ltp-list@lists.sourceforge.net
> Sent: Friday, 5 December, 2014 2:37:22 AM
> Subject: Re: [LTP] [PATCH] syscalls/getgroups/getgroups01: set supplementary groups to prevent TCONF
> 
> On Thu, Dec 04, 2014 at 05:44:14AM -0500, Jan Stancek wrote:
> > ----- Original Message -----
> > > From: "Cyril Hrubis" <chrubis@suse.cz>
> > > To: ltp-list@lists.sourceforge.net
> > > Sent: Thursday, 4 December, 2014 11:17:41 AM
> > > Subject: Re: [LTP] [PATCH] syscalls/getgroups/getgroups01: set
> > > supplementary groups to prevent TCONF
> > > 
> > > Hi!
> > > > Signed-off-by: Han Pingtian <hanpt@linux.vnet.ibm.com>
> > > > ---
> > > >  testcases/kernel/syscalls/getgroups/getgroups01.c | 5 +++--
> > > >  1 file changed, 3 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/testcases/kernel/syscalls/getgroups/getgroups01.c
> > > > b/testcases/kernel/syscalls/getgroups/getgroups01.c
> > > > index 9fb4c98..28559d3 100644
> > > > --- a/testcases/kernel/syscalls/getgroups/getgroups01.c
> > > > +++ b/testcases/kernel/syscalls/getgroups/getgroups01.c
> > > > @@ -74,8 +74,6 @@ int main(int ac, char **av)
> > > >  	int i;
> > > >  	int entries;
> > > >  
> > > > -	initgroups("root", 0);
> > > > -
> > > >  	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
> > > >  		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
> > > >  
> > > > @@ -183,6 +181,9 @@ static void setup(void)
> > 
> > I'd add tst_require_root() to setup, since setgroups() requires CAP_SETGID.
> 
> I think getgroups() doesn't need privileged power, so we shouldn't limit
> this case with tst_require_root, because this case is testing
> getgroups(). With this patch applied, if run by unprivileged user, 3#
> will fail by TCONF, but other tests will pass.

OK, looks like initgroups is implemented via setgroups, so this
was failing silently before as well.

Regards,
Jan

> 
> Thanks.
> 
> 
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