Re: [LTP] [PATCH] userns02: always set/check GID mapping

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> From: "Yuan Sun" <sunyuan3@huawei.com>
> To: jstancek@redhat.com
> Cc: ltp-list@lists.sourceforge.net
> Sent: Monday, 20 July, 2015 2:10:21 PM
> Subject: [PATCH] userns02: always set/check GID mapping
> 
> Signed-off-by: Yuan Sun <sunyuan3@huawei.com>

Pushed with following text added to commit message:
    The test previously relied on fact that it can always set GID mapping.
    To allow this for unprivileged users on kernels >= 3.19, we have to
    disable setgroups first.

Thanks,
Jan

> ---
>  testcases/kernel/containers/userns/userns02.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/testcases/kernel/containers/userns/userns02.c
> b/testcases/kernel/containers/userns/userns02.c
> index 3bcb97d..e1677b6 100644
> --- a/testcases/kernel/containers/userns/userns02.c
> +++ b/testcases/kernel/containers/userns/userns02.c
> @@ -62,7 +62,6 @@ static int child_fn1(void)
>  static void setup(void)
>  {
>  	check_newuser();
> -
>  	tst_tmpdir();
>  	TST_CHECKPOINT_INIT(NULL);
>  }
> @@ -96,6 +95,14 @@ int main(int argc, char *argv[])
>  		fd = SAFE_OPEN(cleanup, path, O_WRONLY, 0644);
>  		SAFE_WRITE(cleanup, 1, fd, content, strlen(content));
>  		SAFE_CLOSE(cleanup, fd);
> +
> +		if (access("/proc/self/setgroups", F_OK) == 0) {
> +			sprintf(path, "/proc/%d/setgroups", childpid);
> +			fd = SAFE_OPEN(cleanup, path, O_WRONLY, 0644);
> +			SAFE_WRITE(cleanup, 1, fd, "deny", 4);
> +			SAFE_CLOSE(cleanup, fd);
> +		}
> +
>  		sprintf(path, "/proc/%d/gid_map", childpid);
>  		sprintf(content, "100 %d 1", parentgid);
>  		fd = SAFE_OPEN(cleanup, path, O_WRONLY, 0644);
> --
> 1.9.1
> 
> 

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