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linux: enable STRICT_KERNEL_RWX & STRICT_MODULE_RWX

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Enabled in [Arch][1], [Debian][2], [Fedora][3]. Recommended by [Kernel
Self Protection Project][4].

As it is now in common-config, remove from hardened’s extra config.

[1]: 6392fb2bed/config (L914-917)
[2]: 5f6aa5cb48/debian/config/config (L11-12)
[3]: e8025dc0fb/f/kernel-x86_64-fedora.config (_7449)
[4]: https://kernsec.org/wiki/index.php?title=Kernel_Self_Protection_Project/Recommended_Settings&oldid=4078
This commit is contained in:
Andrew Marshall 2024-04-01 11:37:34 -04:00
parent ff5cd23067
commit dd666b86ad
2 changed files with 2 additions and 2 deletions
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2
pkgs/os-specific/linux/kernel/common-config.nix
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@ -674,6 +674,8 @@ let
HARDENED_USERCOPY = yes;
RANDOMIZE_BASE = option yes;
STRICT_KERNEL_RWX = yes;
STRICT_MODULE_RWX = yes;
STRICT_DEVMEM = mkDefault yes; # Filter access to /dev/mem
IO_STRICT_DEVMEM = mkDefault yes;
SECURITY_SELINUX_BOOTPARAM_VALUE = whenOlder "5.1" (freeform "0"); # Disable SELinux by default

2
pkgs/os-specific/linux/kernel/hardened/config.nix
View File

@ -31,8 +31,6 @@ assert (versionAtLeast version "4.9");
SECURITY_SELINUX_DISABLE = whenOlder "6.4" no; # On 6.4: error: unused option: SECURITY_SELINUX_DISABLE
SECURITY_WRITABLE_HOOKS = option no;
STRICT_KERNEL_RWX = yes;
# Perform additional validation of commonly targeted structures.
DEBUG_CREDENTIALS = whenOlder "6.6" yes;
DEBUG_NOTIFIERS = yes;