From ba2c3f3cce27b87d7798e83f2df998b60432ad4c Mon Sep 17 00:00:00 2001
From: Andreas Schultz <andreas.schultz@travelping.com>
Date: Wed, 3 Jul 2024 11:55:39 +0200
Subject: [PATCH] make SCTP in images work older Linux kernels

Linux SCTP ioctls argument length checking is not forward compatible
with newer kernel headers.

The length of the SCTP ioctl argument is based on the size of some
SCTP structs. If code compiled with newer kernel headers, where the
SCTP structs are larger, is running on an older kernel and tries to
pass the a SCTP struct that is larger than what the running kernel
supports, then the ioctl results in an error.

Erlangs SCTP code does excatly that. That means that SCTP in a Erlang
VM that has been compiled with recent kernel headers will not work on
older kernels.

This change pulls in Linux 5.4.5 kernel headers (and only the kernel
headers) from Alpine 3.12. The resulting images will have working SCTP
support when running on Linux 5.4.5 and newer.
---
 24/alpine/Dockerfile     | 3 ++-
 25/alpine/Dockerfile     | 3 ++-
 26/alpine/Dockerfile     | 3 ++-
 27/alpine/Dockerfile     | 3 ++-
 master/alpine/Dockerfile | 3 ++-
 5 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/24/alpine/Dockerfile b/24/alpine/Dockerfile
index ccd5ef1c..870d5bc0 100644
--- a/24/alpine/Dockerfile
+++ b/24/alpine/Dockerfile
@@ -15,11 +15,12 @@ RUN set -xe \
 	&& curl -fSL -o otp-src.tar.gz "$OTP_DOWNLOAD_URL" \
 	&& echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
 	&& apk add --no-cache --virtual .build-deps \
+		   --repository=http://dl-cdn.alpinelinux.org/alpine/v3.12/main \
 		dpkg-dev dpkg \
 		gcc \
 		g++ \
 		libc-dev \
-		linux-headers \
+		linux-headers=5.4.5-r1 \
 		make \
 		autoconf \
 		ncurses-dev \
diff --git a/25/alpine/Dockerfile b/25/alpine/Dockerfile
index 546d475a..a8a9de96 100644
--- a/25/alpine/Dockerfile
+++ b/25/alpine/Dockerfile
@@ -15,11 +15,12 @@ RUN set -xe \
 	&& curl -fSL -o otp-src.tar.gz "$OTP_DOWNLOAD_URL" \
 	&& echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
 	&& apk add --no-cache --virtual .build-deps \
+		   --repository=http://dl-cdn.alpinelinux.org/alpine/v3.12/main \
 		dpkg-dev dpkg \
 		gcc \
 		g++ \
 		libc-dev \
-		linux-headers \
+		linux-headers=5.4.5-r1 \
 		make \
 		autoconf \
 		ncurses-dev \
diff --git a/26/alpine/Dockerfile b/26/alpine/Dockerfile
index 1a6f56a4..b4206227 100644
--- a/26/alpine/Dockerfile
+++ b/26/alpine/Dockerfile
@@ -15,11 +15,12 @@ RUN set -xe \
 	&& curl -fSL -o otp-src.tar.gz "$OTP_DOWNLOAD_URL" \
 	&& echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
 	&& apk add --no-cache --virtual .build-deps \
+		   --repository=http://dl-cdn.alpinelinux.org/alpine/v3.12/main \
 		dpkg-dev dpkg \
 		gcc \
 		g++ \
 		libc-dev \
-		linux-headers \
+		linux-headers=5.4.5-r1 \
 		make \
 		autoconf \
 		ncurses-dev \
diff --git a/27/alpine/Dockerfile b/27/alpine/Dockerfile
index 8b3185d2..2204886b 100644
--- a/27/alpine/Dockerfile
+++ b/27/alpine/Dockerfile
@@ -15,11 +15,12 @@ RUN set -xe \
 	&& curl -fSL -o otp-src.tar.gz "$OTP_DOWNLOAD_URL" \
 	&& echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
 	&& apk add --no-cache --virtual .build-deps \
+		   --repository=http://dl-cdn.alpinelinux.org/alpine/v3.12/main \
 		dpkg-dev dpkg \
 		gcc \
 		g++ \
 		libc-dev \
-		linux-headers \
+		linux-headers=5.4.5-r1 \
 		make \
 		autoconf \
 		ncurses-dev \
diff --git a/master/alpine/Dockerfile b/master/alpine/Dockerfile
index 2e1debf8..5755154f 100644
--- a/master/alpine/Dockerfile
+++ b/master/alpine/Dockerfile
@@ -15,11 +15,12 @@ RUN set -xe \
 	&& curl -fSL -o otp-src.tar.gz "$OTP_DOWNLOAD_URL" \
 	&& echo "$OTP_DOWNLOAD_SHA256  otp-src.tar.gz" | sha256sum -c - \
 	&& apk add --no-cache --virtual .build-deps \
+		   --repository=http://dl-cdn.alpinelinux.org/alpine/v3.12/main \
 		dpkg-dev dpkg \
 		gcc \
 		g++ \
 		libc-dev \
-		linux-headers \
+		linux-headers=5.4.5-r1 \
 		make \
 		autoconf \
 		ncurses-dev \