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vm.mmap_rnd_bits: Fix ppc64le

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Probably fixes a bunch of other non-x86_64 arches too.
This commit is contained in:
Jeremy Rand 2023-03-24 12:32:58 +00:00
parent 5c6db28881
commit 61f63255ac
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GPG key ID: EB03139A459DD06E
5 changed files with 58 additions and 4 deletions
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50
usr/libexec/security-misc/mmap-rnd-bits Executable file
View file

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#!/usr/bin/env bash
set -euo pipefail
shopt -s failglob
## Copyright (C) 2019 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## See the file COPYING for copying conditions.
## This script enforces the maximum ASLR hardening settings for mmap, given the
## installed Linux config.
## Defaults in case Linux config detection fails. These are likely to work fine
## on x86_64, probably not elsewhere.
BITS_MAX_DEFAULT=32
COMPAT_BITS_MAX_DEFAULT=16
## Find the most recently modified Linux config file.
if CONFIG=$(ls -1 -t /boot/config-* | head -n 1)
then
## Find the relevant config options.
if ! BITS_MAX=$(grep "CONFIG_ARCH_MMAP_RND_BITS_MAX" "${CONFIG}" | cut -d "=" -f 2)
then
echo "Error detecting CONFIG_ARCH_MMAP_RND_BITS_MAX"
BITS_MAX="${BITS_MAX_DEFAULT}"
fi
if ! COMPAT_BITS_MAX=$(grep "CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX" "${CONFIG}" | cut -d "=" -f 2)
then
echo "Error detecting CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX"
COMPAT_BITS_MAX="${COMPAT_BITS_MAX_DEFAULT}"
fi
else
echo "Error detecting Linux config"
BITS_MAX="${BITS_MAX_DEFAULT}"
COMPAT_BITS_MAX="${COMPAT_BITS_MAX_DEFAULT}"
fi
## Generate a sysctl.d conf file.
SYSCTL="## Copyright (C) 2019 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## See the file COPYING for copying conditions.
## This file is automatically generated, do not edit!
## Improves ASLR effectiveness for mmap.
vm.mmap_rnd_bits=${BITS_MAX}
vm.mmap_rnd_compat_bits=${COMPAT_BITS_MAX}"
## Write the sysctl.d conf file.
echo "${SYSCTL}" > /etc/sysctl.d/30_security-misc_aslr-mmap.conf
exit 0