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minor mmap-rnd-bits improvements

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Patrick Schleizer 2023-05-05 14:44:29 +00:00
parent 15d0ee1008
commit d6d79e96c9
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3 changed files with 21 additions and 18 deletions
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33
usr/libexec/security-misc/mmap-rnd-bits
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@ -1,41 +1,39 @@
#!/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.
set -euo pipefail
shopt -s failglob
## 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 compgen -G "/boot/config-*" > /dev/null && CONFIG=$(ls -1 -t /boot/config-* | head -n 1)
then
if compgen -G "/boot/config-*" > /dev/null && CONFIG=$(ls -1 -t /boot/config-* | head -n 1) ; then
## Find the relevant config options.
if ! BITS_MAX=$(grep -E '^CONFIG_ARCH_MMAP_RND_BITS_MAX=[0-9]+$' "${CONFIG}" | cut -d "=" -f 2)
then
echo "Error detecting CONFIG_ARCH_MMAP_RND_BITS_MAX"
if ! BITS_MAX=$(grep -E '^CONFIG_ARCH_MMAP_RND_BITS_MAX=[0-9]+$' "${CONFIG}" | cut -d "=" -f 2) ; then
echo "$0: ERROR: Error detecting CONFIG_ARCH_MMAP_RND_BITS_MAXQ Using built-in default." >&2
BITS_MAX="${BITS_MAX_DEFAULT}"
fi
if ! COMPAT_BITS_MAX=$(grep -E '^CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=[0-9]+$' "${CONFIG}" | cut -d "=" -f 2)
then
echo "Error detecting CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX"
if ! COMPAT_BITS_MAX=$(grep -E '^CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=[0-9]+$' "${CONFIG}" | cut -d "=" -f 2) ; then
echo "$0: ERROR: Error detecting CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX! Using built-in default." >&2
COMPAT_BITS_MAX="${COMPAT_BITS_MAX_DEFAULT}"
fi
else
echo "Error detecting Linux config"
echo "$0: ERROR: Error detecting Linux config! Using built-in defaults." >&2
BITS_MAX="${BITS_MAX_DEFAULT}"
COMPAT_BITS_MAX="${COMPAT_BITS_MAX_DEFAULT}"
fi
## Generate a sysctl.d conf file.
SYSCTL="## Copyright (C) 2019 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
SYSCTL="\
## Copyright (C) 2019 - 2023 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## See the file COPYING for copying conditions.
## This file is automatically generated, do not edit!
@ -45,9 +43,10 @@ vm.mmap_rnd_bits=${BITS_MAX}
vm.mmap_rnd_compat_bits=${COMPAT_BITS_MAX}"
## Write the sysctl.d conf file.
if ! echo "${SYSCTL}" | tee /etc/sysctl.d/30_security-misc_aslr-mmap.conf > /dev/null
then
echo "Error writing ASLR map config"
if echo "${SYSCTL}" | tee /etc/sysctl.d/30_security-misc_aslr-mmap.conf > /dev/null ; then
exit 0
fi
exit 0
echo "$0: ERROR: Error writing ASLR map config file '/etc/sysctl.d/30_security-misc_aslr-mmap.conf'!" >&2
exit 1