#!/bin/bash
# US-S5-1 — enable remaining Graphene/AXP-class defconfig knobs on msm-4.14.
#
# Oracle: AXP/Graphene kernel hardening expects Yama + slab freelist random
# (combo4 already ships SLAB_FREELIST_HARDENED). LOS sunfish_defconfig left both
# off; CONFIG_LSM already lists yama but SECURITY_YAMA was unset so the LSM
# never built.
#
# Does NOT apply high-offset CVE leftovers (nf_tables deliberately skipped).
# CVE-2022-49980's one-liner stays on the denylist. The bacon applies
# ports/cve-2022-49980-lock-scope.patch after the CVE lists.
#
# USERFAULTFD: GOLDEN's running 4.14.355 config leaves it unset. LOS 23
# sunfish_defconfig turns it on. This kernel has no UFFDIO_MOVE (that ioctl
# is 6.1+), so ART only opens a fd and times out. Match GOLDEN.
#
# Usage: apply_uss5_1_defconfig.sh <kernel-tree>
set -euo pipefail

K=${1:?kernel tree}
DEF="$K/arch/arm64/configs/sunfish_defconfig"
test -f "$DEF"
test -f "$K/security/yama/Kconfig"

for k in SECURITY_YAMA SLAB_FREELIST_RANDOM USERFAULTFD HAVE_ARCH_USERFAULTFD_MINOR; do
  sed -i "/CONFIG_${k}/d" "$DEF"
done

{
  echo "CONFIG_SECURITY_YAMA=y"
  echo "CONFIG_SLAB_FREELIST_RANDOM=y"
  echo "# CONFIG_USERFAULTFD is not set"
} >> "$DEF"

echo "OK: US-S5-1 defconfig (YAMA + SLAB_FREELIST_RANDOM, USERFAULTFD off) on $K"