[lttng-dev] [PATCH lttng-tools] Fix: run_as gid/uid test should return result to parent

[David Goulet]

Merged!

David

Mathieu Desnoyers:
> Failure to do so could cause the parent to hang on read() waiting for
> the return value from the child.
> 
> Targets: 2.3-rc and stable-2.2 branches.
>  
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
> ---
> diff --git a/src/common/runas.c b/src/common/runas.c
> index bd51cd4..6979ad3 100644
> --- a/src/common/runas.c
> +++ b/src/common/runas.c
> @@ -130,14 +130,16 @@ int child_run_as(void *_data)
>  		ret = setegid(data->gid);
>  		if (ret < 0) {
>  			PERROR("setegid");
> -			return EXIT_FAILURE;
> +			sendret.i = -1;
> +			goto write_return;
>  		}
>  	}
>  	if (data->uid != geteuid()) {
>  		ret = seteuid(data->uid);
>  		if (ret < 0) {
>  			PERROR("seteuid");
> -			return EXIT_FAILURE;
> +			sendret.i = -1;
> +			goto write_return;
>  		}
>  	}
>  	/*
> @@ -145,6 +147,8 @@ int child_run_as(void *_data)
>  	 */
>  	umask(0);
>  	sendret.i = (*data->cmd)(data->data);
> +
> +write_return:
>  	/* send back return value */
>  	writeleft = sizeof(sendret);
>  	index = 0;
>