[lxc-devel] [PATCH] api_start: always close fds 0-2 when daemonized

[Serge Hallyn]

Quoting Serge Hallyn (serge.hallyn at ubuntu.com):

Description should have included:

Closes #548

> commit 507cee3618237d3 moved the close and re-open of fds 0-2 into
> do_start.  But this means that the lxc monitor itself keeps the
> caller's fds 0-2 open, which is wrong for daemonized containers.
> 
> Reported-by: Mathieu Le Marec - Pasquet <kiorky at cryptelium.net>
> Signed-off-by: Serge Hallyn <serge.hallyn at ubuntu.com>
> ---
>  src/lxc/lxccontainer.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/src/lxc/lxccontainer.c b/src/lxc/lxccontainer.c
> index fd56327..916c99c 100644
> --- a/src/lxc/lxccontainer.c
> +++ b/src/lxc/lxccontainer.c
> @@ -722,6 +722,12 @@ static bool do_lxcapi_start(struct lxc_container *c, int useinit, char * const a
>  			return false;
>  		}
>  		lxc_check_inherited(conf, true, -1);
> +		close(0);
> +		close(1);
> +		close(2);
> +		open("/dev/zero", O_RDONLY);
> +		open("/dev/null", O_RDWR);
> +		open("/dev/null", O_RDWR);
>  		setsid();
>  	} else {
>  		if (!am_single_threaded()) {
> -- 
> 2.1.4
> 
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