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114 lines
3.3 KiB
Nix
114 lines
3.3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.environment.memoryAllocator;
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# The set of alternative malloc(3) providers.
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providers = {
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graphene-hardened = {
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libPath = "${pkgs.graphene-hardened-malloc}/lib/libhardened_malloc.so";
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description = ''
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An allocator designed to mitigate memory corruption attacks, such as
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those caused by use-after-free bugs.
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'';
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};
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jemalloc = {
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libPath = "${pkgs.jemalloc}/lib/libjemalloc.so";
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description = ''
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A general purpose allocator that emphasizes fragmentation avoidance
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and scalable concurrency support.
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'';
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};
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scudo = let
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platformMap = {
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aarch64-linux = "aarch64";
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x86_64-linux = "x86_64";
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};
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systemPlatform = platformMap.${pkgs.stdenv.hostPlatform.system} or (throw "scudo not supported on ${pkgs.stdenv.hostPlatform.system}");
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in {
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libPath = "${pkgs.llvmPackages_14.compiler-rt}/lib/linux/libclang_rt.scudo-${systemPlatform}.so";
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description = ''
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A user-mode allocator based on LLVM Sanitizer’s CombinedAllocator,
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which aims at providing additional mitigations against heap based
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vulnerabilities, while maintaining good performance.
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'';
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};
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mimalloc = {
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libPath = "${pkgs.mimalloc}/lib/libmimalloc.so";
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description = ''
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A compact and fast general purpose allocator, which may
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optionally be built with mitigations against various heap
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vulnerabilities.
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'';
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};
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};
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providerConf = providers.${cfg.provider};
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# An output that contains only the shared library, to avoid
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# needlessly bloating the system closure
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mallocLib = pkgs.runCommand "malloc-provider-${cfg.provider}"
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rec {
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preferLocalBuild = true;
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allowSubstitutes = false;
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origLibPath = providerConf.libPath;
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libName = baseNameOf origLibPath;
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}
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''
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mkdir -p $out/lib
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cp -L $origLibPath $out/lib/$libName
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'';
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# The full path to the selected provider shlib.
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providerLibPath = "${mallocLib}/lib/${mallocLib.libName}";
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in
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{
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meta = {
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maintainers = [ maintainers.joachifm ];
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};
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options = {
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environment.memoryAllocator.provider = mkOption {
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type = types.enum ([ "libc" ] ++ attrNames providers);
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default = "libc";
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description = lib.mdDoc ''
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The system-wide memory allocator.
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Briefly, the system-wide memory allocator providers are:
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- `libc`: the standard allocator provided by libc
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${concatStringsSep "\n" (mapAttrsToList
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(name: value: "- `${name}`: ${replaceStrings [ "\n" ] [ " " ] value.description}")
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providers)}
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::: {.warning}
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Selecting an alternative allocator (i.e., anything other than
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`libc`) may result in instability, data loss,
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and/or service failure.
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:::
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'';
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};
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};
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config = mkIf (cfg.provider != "libc") {
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environment.etc."ld-nix.so.preload".text = ''
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${providerLibPath}
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'';
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security.apparmor.includes = {
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"abstractions/base" = ''
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r /etc/ld-nix.so.preload,
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r ${config.environment.etc."ld-nix.so.preload".source},
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include "${pkgs.apparmorRulesFromClosure {
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name = "mallocLib";
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baseRules = ["mr $path/lib/**.so*"];
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} [ mallocLib ] }"
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'';
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};
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};
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}
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