x86/speculation/mds: Add mitigation control for MDS

[mirror_ubuntu-bionic-kernel.git] / debian / scripts / retpoline-extract

#!/bin/bash

cd "$1" || exit 1

# Find all valid retpoline information, collate the detected and
# safe information together.  Join the result to find the detected
# but non-safe elements.  These are our concern.
ur_detected=$(mktemp --tmpdir "retpoline-check-XXXXXX.ur-detected")
ur_safe=$(mktemp --tmpdir "retpoline-check-XXXXXX.ur-safe")

find "." -path './drivers/firmware/efi/libstub' -prune -o \
	 -path './arch/x86/boot' -prune -o \
	 -path './arch/x86/purgatory' -prune -o \
	 -name \*.ur-detected -print0 | xargs -0 cat | \
	sed -e "s@^$1@@" -e "s@ $2/@ @" -e "s@^/@@" | \
	sort -k 1b,1 >"$ur_detected"
find "." -name \*.ur-safe -print0 | xargs -0 cat | \
	sed -e "s@^$1@@" -e "s@^/@@" | \
	sort -k 1b,1 >"$ur_safe"

join -v 1 -j 1 "$ur_detected" "$ur_safe" | sed -s 's/[^ ]*  *//'

rm -f "$ur_detected" "$ur_safe"