mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-16 18:53:17 +00:00
64 lines
1.7 KiB
Nix
64 lines
1.7 KiB
Nix
# Based on recommendations from:
|
|
# http://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project#Recommended_settings
|
|
# https://wiki.gentoo.org/wiki/Hardened/Hardened_Kernel_Project
|
|
#
|
|
# Dangerous features that can be permanently (for the boot session) disabled at
|
|
# boot via sysctl or kernel cmdline are left enabled here, for improved
|
|
# flexibility.
|
|
|
|
{ stdenv, version }:
|
|
|
|
with stdenv.lib;
|
|
|
|
assert (versionAtLeast version "4.9");
|
|
|
|
''
|
|
GCC_PLUGINS y # Enable gcc plugin options
|
|
|
|
${optionalString (versionAtLeast version "4.11") ''
|
|
GCC_PLUGIN_STRUCTLEAK y # A port of the PaX structleak plugin
|
|
''}
|
|
|
|
DEBUG_WX y # A one-time check for W+X mappings at boot; doesn't do anything beyond printing a warning
|
|
|
|
${optionalString (versionAtLeast version "4.10") ''
|
|
BUG_ON_DATA_CORRUPTION y # BUG if kernel struct validation detects corruption
|
|
''}
|
|
|
|
# Additional validation of commonly targetted structures
|
|
DEBUG_CREDENTIALS y
|
|
DEBUG_NOTIFIERS y
|
|
DEBUG_LIST y
|
|
DEBUG_SG y
|
|
|
|
HARDENED_USERCOPY y # Bounds check usercopy
|
|
|
|
# Wipe on free with page_poison=1
|
|
PAGE_POISONING y
|
|
PAGE_POISONING_NO_SANITY y
|
|
PAGE_POISONING_ZERO y
|
|
|
|
CC_STACKPROTECTOR_REGULAR n
|
|
CC_STACKPROTECTOR_STRONG y
|
|
|
|
# Stricter /dev/mem
|
|
STRICT_DEVMEM y
|
|
IO_STRICT_DEVMEM y
|
|
|
|
# Disable various dangerous settings
|
|
ACPI_CUSTOM_METHOD n # Allows writing directly to physical memory
|
|
PROC_KCORE n # Exposes kernel text image layout
|
|
INET_DIAG n # Has been used for heap based attacks in the past
|
|
|
|
${optionalString (stdenv.system == "x86_64-linux") ''
|
|
DEFAULT_MMAP_MIN_ADDR 65536 # Prevent allocation of first 64K of memory
|
|
|
|
# Reduce attack surface by disabling various emulations
|
|
IA32_EMULATION n
|
|
X86_X32 n
|
|
|
|
VMAP_STACK y # Catch kernel stack overflows
|
|
''}
|
|
|
|
''
|