Re: [DistroKit] [PATCH v2] v7a: run: really constrain the forwarded SSH port to <= 64000

[Robert Schwebel <r.schwebel@pengutronix.de>]

On Thu, Nov 25, 2021 at 04:22:19PM +0100, Roland Hieber wrote:
> The variable expansion braces should have been arithmetic evaluation
> parentheses, which had the effect that the PPID was always used as a
> port number (which incidentally works fine for PPIDs < 65535).
> 
> Fixes: d975eb8b04087f8606d8 (2021-04-26, "v7a: run: make the SSH forwarding port multiprocess-compatible")
> Reported-by: Jürgen Borleis <jbe@pengutronix.de>
> Signed-off-by: Roland Hieber <rhi@pengutronix.de>
> ---
> v2: rebase after Holger's typo fix, improve log message
> ---
>  configs/platform-v7a/run | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/configs/platform-v7a/run b/configs/platform-v7a/run
> index c1297bbf5537..8de9c13ee8fc 100755
> --- a/configs/platform-v7a/run
> +++ b/configs/platform-v7a/run
> @@ -39,7 +39,7 @@ fi
>  # the port to which an sshd would connect (in the emulated system)
>  SSH_INTERNAL_PORT=22
>  # the port which QEMU opens at the host side to give access to the ${SSH_INTERNAL_PORT}
> -SSH_EXTERNAL_PORT=${QEMU_SSH_PORT:-${PPID%64000+1025}}
> +SSH_EXTERNAL_PORT=${QEMU_SSH_PORT:-$((PPID%64000+1025))}
>  
>  # check if vde is available for networking
>  if [ -z "${VDE_SOCKET}" ]; then
> -- 
> 2.30.2

Thanks, applied for next.

rsc
-- 
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