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nixos/hardened: don't set vm.mmap_rnd{,_compat}_bits

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Upstreamed in anthraxx/linux-hardened@ae6d85f437.
This commit is contained in:
Emily 2020-04-05 04:07:51 +01:00
parent af4f57b2c4
commit 46d12cca56
1 changed files with 0 additions and 6 deletions
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6
nixos/modules/profiles/hardened.nix
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@ -82,12 +82,6 @@ with lib;
# Disable bpf() JIT (to eliminate spray attacks)
boot.kernel.sysctl."net.core.bpf_jit_enable" = mkDefault false;
# Raise ASLR entropy for 64bit & 32bit, respectively.
#
# Note: mmap_rnd_compat_bits may not exist on 64bit.
boot.kernel.sysctl."vm.mmap_rnd_bits" = mkDefault 32;
boot.kernel.sysctl."vm.mmap_rnd_compat_bits" = mkDefault 16;
# Allowing users to mmap() memory starting at virtual address 0 can turn a
# NULL dereference bug in the kernel into code execution with elevated
# privilege. Mitigate by enforcing a minimum base addr beyond the NULL memory