Re: [PATCH v1 5/6] tests: only run ipmi-bt-test if CONFIG_LINUX

[Corey Minyard <cminyard@mvista.com>]

On Mon, Nov 04, 2019 at 05:36:53PM +0000, Alex Bennée wrote:
> This test has been unstable on NetBSD for awhile. It seems the
> mechanism used to listen to a random port is a Linux-ism (although a
> received wisdom Linux-ism rather than a well documented one). As

Hmm.  I got reports of this issue and tried to reproduce, but I was
never able to.  I thought I had fixed it via other means, but I had no
idea this was the cause of the issue.

It's not a Linux-ism, I don't think, Richard Steven's "Unix Network
Programming" mentions that is how this works (at least on UDP), and that
is pre-Linux.  That's probably where I got this technique.  I've saw
some web pages mention that Solaris and Windows do it this way.

However, it's not specified, so it's probably a bad idea.  The only way
I can think to do it another way is to remove the bind() call, then it
should randomly assign the port (per the spec, I think).  The trouble
with that is the address will be INADDR_ANY, so it will be bound on
other interfaces besides the loopback, which make me slightly worried
from a security point of view.

I'm ok with this being linux-only, but I'd like to fix it so it works
everywhere.

-corey

> working around would add more hard to test complexity to the test I've
> gone for the easier option of making it CONFIG_LINUX only.
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Cc: Corey Minyard <cminyard@mvista.com>
> Cc: Kamil Rytarowski <kamil@netbsd.org>
> ---
>  tests/Makefile.include | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tests/Makefile.include b/tests/Makefile.include
> index 534ee487436..8566f5f119d 100644
> --- a/tests/Makefile.include
> +++ b/tests/Makefile.include
> @@ -177,7 +177,9 @@ check-qtest-i386-$(CONFIG_SGA) += tests/boot-serial-test$(EXESUF)
>  check-qtest-i386-$(CONFIG_SLIRP) += tests/pxe-test$(EXESUF)
>  check-qtest-i386-y += tests/rtc-test$(EXESUF)
>  check-qtest-i386-$(CONFIG_ISA_IPMI_KCS) += tests/ipmi-kcs-test$(EXESUF)
> +ifdef CONFIG_LINUX
>  check-qtest-i386-$(CONFIG_ISA_IPMI_BT) += tests/ipmi-bt-test$(EXESUF)
> +endif
>  check-qtest-i386-y += tests/i440fx-test$(EXESUF)
>  check-qtest-i386-y += tests/fw_cfg-test$(EXESUF)
>  check-qtest-i386-y += tests/device-plug-test$(EXESUF)
> -- 
> 2.20.1
>