Re: [LTP] [PATCH V2] containers: new testcase userns02

[Yuan Sun <sunyuan3@huawei.com>]

Hi Jan,
     Excellent. Many thanks for your help.
I am creating a new testcase userns03 to cover the following. I will 
send the
patch soon.

(1) If the process opening the file is in the same user namespace as the 
process
PID, then ID-outside-ns is defined with respect to the parent user 
namespace.
(2) If the process opening the file is in a different user namespace, then
ID-outside-ns is defined with respect to the user namespace of the process
opening the file.

Thanks. Regards.
     Yuan


On 2015/6/2 16:09, Jan Stancek wrote:
>
>
> ----- Original Message -----
>> From: "Jan Stancek" <jstancek@redhat.com>
>> To: "Yuan Sun" <sunyuan3@huawei.com>
>> Cc: ltp-list@lists.sourceforge.net, pleasuresun@sina.com
>> Sent: Thursday, 28 May, 2015 2:33:53 PM
>> Subject: Re: [LTP] [PATCH V2] containers: new testcase userns02
>>
>>
>>
>>
>>
>> ----- Original Message -----
>>> From: "Yuan Sun" <sunyuan3@huawei.com>
>>> To: jstancek@redhat.com
>>> Cc: ltp-list@lists.sourceforge.net, pleasuresun@sina.com,
>>> sunyuan3@huawei.com
>>> Sent: Wednesday, 27 May, 2015 11:00:21 PM
>>> Subject: [PATCH V2] containers: new testcase userns02
>>>
>>> The user ID and group ID, which are inside a container, can
>>> be modified by its parent process.
>>>
>>> Signed-off-by: Yuan Sun <sunyuan3@huawei.com>
> Pushed with these changes:
>    global variables moved to main()
>    added cleanup() and tmp dir so we don't leave futex base file behind
>    don't print TPASS unconditionally
>
> Regards,
> Jan
>
>> Hi,
>>
>> couple comments inline, but overall it looks good to me.
>> Unless someone points out other issues, I can fix these before commit.
>>
>>> ---
>>>   runtest/containers                            |   1 +
>>>   testcases/kernel/containers/.gitignore        |   1 +
>>>   testcases/kernel/containers/userns/userns02.c | 113
>>>   ++++++++++++++++++++++++++
>>>   3 files changed, 115 insertions(+)
>>>   create mode 100644 testcases/kernel/containers/userns/userns02.c
>>>
>>> diff --git a/runtest/containers b/runtest/containers
>>> index ca10372..bb1beb6 100644
>>> --- a/runtest/containers
>>> +++ b/runtest/containers
>>> @@ -69,3 +69,4 @@ mountns03 mountns03
>>>   mountns04 mountns04
>>>   
>>>   userns01 userns01
>>> +userns02 userns02
>>> diff --git a/testcases/kernel/containers/.gitignore
>>> b/testcases/kernel/containers/.gitignore
>>> index 4478b53..e3c92c9 100644
>>> --- a/testcases/kernel/containers/.gitignore
>>> +++ b/testcases/kernel/containers/.gitignore
>>> @@ -4,3 +4,4 @@ mountns/mountns02
>>>   mountns/mountns03
>>>   mountns/mountns04
>>>   userns/userns01
>>> +userns/userns02
>>> diff --git a/testcases/kernel/containers/userns/userns02.c
>>> b/testcases/kernel/containers/userns/userns02.c
>>> new file mode 100644
>>> index 0000000..6a4b36d
>>> --- /dev/null
>>> +++ b/testcases/kernel/containers/userns/userns02.c
>>> @@ -0,0 +1,113 @@
>>> +/*
>>> + * Copyright (c) Huawei Technologies Co., Ltd., 2015
>>> + * This program is free software; you can redistribute it and/or modify
>>> + * it under the terms of the GNU General Public License as published by
>>> + * the Free Software Foundation; either version 2 of the License, or
>>> + *  (at your option) any later version.
>>> + *
>>> + * This program is distributed in the hope that it will be useful,
>>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
>>> + * the GNU General Public License for more details.
>>> + */
>>> +
>>> +/*
>>> + * Verify that:
>>> + *  The user ID and group ID, which are inside a container, can be
>>> modified
>>> + * by its parent process.
>>> + */
>>> +
>>> +#define _GNU_SOURCE
>>> +#include <sys/wait.h>
>>> +#include <assert.h>
>>> +#include <stdio.h>
>>> +#include <stdlib.h>
>>> +#include <unistd.h>
>>> +#include <string.h>
>>> +#include <errno.h>
>>> +#include "test.h"
>>> +#include "userns_helper.h"
>>> +
>>> +char *TCID = "user_namespace2";
>>> +int TST_TOTAL = 1;
>>> +
>>> +int childpid;
>>> +int parentuid;
>>> +int parentgid;
>>> +char path[BUFSIZ];
>>> +char content[BUFSIZ];
>>> +static int fd;
>> No need for these to be global, all can be in main.
>>
>>> +/*
>>> + * child_fn1() - Inside a new user namespace
>>> + */
>>> +static int child_fn1(void)
>>> +{
>>> +	int exit_val;
>>> +	int uid, gid;
>>> +
>>> +	TST_SAFE_CHECKPOINT_WAIT(NULL, 0);
>>> +	uid = geteuid();
>>> +	gid = getegid();
>>> +
>>> +	printf("USERNS test is running in a new user namespace.\n");
>>> +	if (uid == 100 && gid == 100) {
>>> +		printf("Got expected uid and gid.\n");
>>> +		exit_val = 0;
>>> +	} else {
>>> +		printf("Got unexpected result of uid=%d gid=%d\n", uid, gid);
>>> +		exit_val = 1;
>>> +	}
>>> +
>>> +	return exit_val;
>>> +}
>>> +
>>> +static void setup(void)
>>> +{
>>> +	TST_CHECKPOINT_INIT(NULL);
>>> +	check_newuser();
>>> +}
>>> +
>>> +int main(int argc, char *argv[])
>>> +{
>>> +	int status;
>>> +	int lc;
>>> +
>>> +	tst_parse_opts(argc, argv, NULL, NULL);
>>> +	setup();
>>> +
>>> +	for (lc = 0; TEST_LOOPING(lc); lc++) {
>>> +		tst_count = 0;
>>> +		childpid = ltp_clone_quick(CLONE_NEWUSER | SIGCHLD,
>>> +			(void *)child_fn1, NULL);
>>> +
>>> +		if (childpid < 0)
>>> +			tst_brkm(TFAIL | TERRNO, NULL, "clone failed");
>>> +
>>> +		parentuid = geteuid();
>>> +		parentgid = getegid();
>>> +		sprintf(path, "/proc/%d/uid_map", childpid);
>>> +		sprintf(content, "100 %d 1", parentuid);
>>> +		fd = SAFE_OPEN(NULL, path, O_WRONLY, 0644);
>>> +		SAFE_WRITE(NULL, 1, fd, content, strlen(content));
>>> +		sprintf(path, "/proc/%d/gid_map", childpid);
>>> +		sprintf(content, "100 %d 1", parentgid);
>>> +		fd = SAFE_OPEN(NULL, path, O_WRONLY, 0644);
>>> +		SAFE_WRITE(NULL, 1, fd, content, strlen(content));
>>> +
>>> +		TST_SAFE_CHECKPOINT_WAKE(NULL, 0);
>>> +
>>> +		if (waitpid(childpid, &status, 0) < 0)
>>> +			tst_resm(TBROK | TERRNO, "parent: waitpid failed.");
>>> +
>>> +		if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
>>> +			tst_resm(TFAIL, "child exited abnormally");
>>> +		else if (WIFSIGNALED(status)) {
>>> +			tst_resm(TFAIL, "child was killed with signal = %d",
>>> +				WTERMSIG(status));
>>> +		}
>>> +
>>> +	}
>>> +	tst_resm(TPASS, "the uid and the gid are right inside the container");
>> It will print TPASS even when it fails - not a big issue since T_exitval
>> will carry any previous TFAIL.
>>
>> Regards,
>> Jan
>>
>>> +	tst_exit();
>>> +}
>>> +
>>> --
>>> 1.9.1
>>>
>>>
>> ------------------------------------------------------------------------------
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>>
> .
>


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