328 lines
14 KiB
Nix
328 lines
14 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) mkOption mkDefault types optionalString stringAfter;
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cfg = config.boot.binfmt;
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makeBinfmtLine = name: { recognitionType, offset, magicOrExtension
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, mask, preserveArgvZero, openBinary
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, matchCredentials, fixBinary, ...
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}: let
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type = if recognitionType == "magic" then "M" else "E";
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offset' = toString offset;
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mask' = toString mask;
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interpreter = "/run/binfmt/${name}";
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flags = if !(matchCredentials -> openBinary)
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then throw "boot.binfmt.registrations.${name}: you can't specify openBinary = false when matchCredentials = true."
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else optionalString preserveArgvZero "P" +
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optionalString (openBinary && !matchCredentials) "O" +
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optionalString matchCredentials "C" +
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optionalString fixBinary "F";
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in ":${name}:${type}:${offset'}:${magicOrExtension}:${mask'}:${interpreter}:${flags}";
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activationSnippet = name: { interpreter, wrapInterpreterInShell, ... }: if wrapInterpreterInShell then ''
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rm -f /run/binfmt/${name}
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cat > /run/binfmt/${name} << 'EOF'
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#!${pkgs.bash}/bin/sh
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exec -- ${interpreter} "$@"
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EOF
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chmod +x /run/binfmt/${name}
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'' else ''
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rm -f /run/binfmt/${name}
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ln -s ${interpreter} /run/binfmt/${name}
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'';
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getEmulator = system: (lib.systems.elaborate { inherit system; }).emulator pkgs;
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getQemuArch = system: (lib.systems.elaborate { inherit system; }).qemuArch;
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# Mapping of systems to “magicOrExtension” and “mask”. Mostly taken from:
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# - https://github.com/cleverca22/nixos-configs/blob/master/qemu.nix
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# and
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# - https://github.com/qemu/qemu/blob/master/scripts/qemu-binfmt-conf.sh
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# TODO: maybe put these in a JSON file?
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magics = {
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armv6l-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff'';
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};
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armv7l-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff'';
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};
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aarch64-linux = {
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magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\x00\xff\xfe\xff\xff\xff'';
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};
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aarch64_be-linux = {
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magicOrExtension = ''\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'';
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};
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i386-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'';
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mask = ''\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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i486-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'';
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mask = ''\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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i586-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'';
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mask = ''\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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i686-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'';
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mask = ''\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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x86_64-linux = {
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magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x3e\x00'';
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mask = ''\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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alpha-linux = {
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magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'';
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mask = ''\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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sparc64-linux = {
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magicOrExtension = ''\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'';
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};
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sparc-linux = {
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magicOrExtension = ''\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'';
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};
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powerpc-linux = {
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magicOrExtension = ''\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'';
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};
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powerpc64-linux = {
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magicOrExtension = ''\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'';
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};
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powerpc64le-linux = {
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magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'';
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};
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mips-linux = {
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magicOrExtension = ''\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'';
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};
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mipsel-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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mips64-linux = {
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magicOrExtension = ''\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'';
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};
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mips64el-linux = {
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magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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riscv32-linux = {
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magicOrExtension = ''\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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riscv64-linux = {
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magicOrExtension = ''\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'';
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mask = ''\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'';
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};
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wasm32-wasi = {
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magicOrExtension = ''\x00asm'';
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mask = ''\xff\xff\xff\xff'';
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};
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wasm64-wasi = {
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magicOrExtension = ''\x00asm'';
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mask = ''\xff\xff\xff\xff'';
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};
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x86_64-windows = {
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magicOrExtension = ".exe";
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recognitionType = "extension";
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};
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i686-windows = {
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magicOrExtension = ".exe";
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recognitionType = "extension";
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};
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};
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in {
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imports = [
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(lib.mkRenamedOptionModule [ "boot" "binfmtMiscRegistrations" ] [ "boot" "binfmt" "registrations" ])
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];
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options = {
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boot.binfmt = {
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registrations = mkOption {
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default = {};
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description = lib.mdDoc ''
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Extra binary formats to register with the kernel.
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See https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html for more details.
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'';
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type = types.attrsOf (types.submodule ({ config, ... }: {
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options = {
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recognitionType = mkOption {
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default = "magic";
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description = lib.mdDoc "Whether to recognize executables by magic number or extension.";
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type = types.enum [ "magic" "extension" ];
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};
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offset = mkOption {
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default = null;
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description = lib.mdDoc "The byte offset of the magic number used for recognition.";
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type = types.nullOr types.int;
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};
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magicOrExtension = mkOption {
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description = lib.mdDoc "The magic number or extension to match on.";
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type = types.str;
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};
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mask = mkOption {
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default = null;
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description =
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lib.mdDoc "A mask to be ANDed with the byte sequence of the file before matching";
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type = types.nullOr types.str;
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};
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interpreter = mkOption {
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description = lib.mdDoc ''
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The interpreter to invoke to run the program.
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Note that the actual registration will point to
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/run/binfmt/''${name}, so the kernel interpreter length
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limit doesn't apply.
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'';
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type = types.path;
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};
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preserveArgvZero = mkOption {
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default = false;
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description = lib.mdDoc ''
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Whether to pass the original argv[0] to the interpreter.
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See the description of the 'P' flag in the kernel docs
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for more details;
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'';
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type = types.bool;
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};
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openBinary = mkOption {
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default = config.matchCredentials;
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description = lib.mdDoc ''
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Whether to pass the binary to the interpreter as an open
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file descriptor, instead of a path.
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'';
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type = types.bool;
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};
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matchCredentials = mkOption {
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default = false;
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description = lib.mdDoc ''
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Whether to launch with the credentials and security
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token of the binary, not the interpreter (e.g. setuid
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bit).
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See the description of the 'C' flag in the kernel docs
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for more details.
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Implies/requires openBinary = true.
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'';
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type = types.bool;
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};
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fixBinary = mkOption {
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default = false;
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description = lib.mdDoc ''
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Whether to open the interpreter file as soon as the
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registration is loaded, rather than waiting for a
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relevant file to be invoked.
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See the description of the 'F' flag in the kernel docs
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for more details.
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'';
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type = types.bool;
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};
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wrapInterpreterInShell = mkOption {
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default = true;
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description = lib.mdDoc ''
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Whether to wrap the interpreter in a shell script.
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This allows a shell command to be set as the interpreter.
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'';
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type = types.bool;
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};
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interpreterSandboxPath = mkOption {
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internal = true;
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default = null;
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description = lib.mdDoc ''
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Path of the interpreter to expose in the build sandbox.
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'';
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type = types.nullOr types.path;
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};
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};
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}));
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};
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emulatedSystems = mkOption {
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default = [];
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example = [ "wasm32-wasi" "x86_64-windows" "aarch64-linux" ];
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description = lib.mdDoc ''
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List of systems to emulate. Will also configure Nix to
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support your new systems.
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Warning: the builder can execute all emulated systems within the same build, which introduces impurities in the case of cross compilation.
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'';
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type = types.listOf types.str;
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};
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};
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};
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config = {
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boot.binfmt.registrations = builtins.listToAttrs (map (system: {
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name = system;
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value = { config, ... }: let
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interpreter = getEmulator system;
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qemuArch = getQemuArch system;
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preserveArgvZero = "qemu-${qemuArch}" == baseNameOf interpreter;
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interpreterReg = let
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wrapperName = "qemu-${qemuArch}-binfmt-P";
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wrapper = pkgs.wrapQemuBinfmtP wrapperName interpreter;
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in
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if preserveArgvZero then "${wrapper}/bin/${wrapperName}"
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else interpreter;
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in ({
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preserveArgvZero = mkDefault preserveArgvZero;
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interpreter = mkDefault interpreterReg;
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wrapInterpreterInShell = mkDefault (!config.preserveArgvZero);
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interpreterSandboxPath = mkDefault (dirOf (dirOf config.interpreter));
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} // (magics.${system} or (throw "Cannot create binfmt registration for system ${system}")));
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}) cfg.emulatedSystems);
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nix.settings = lib.mkIf (cfg.emulatedSystems != []) {
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extra-platforms = cfg.emulatedSystems ++ lib.optional pkgs.stdenv.hostPlatform.isx86_64 "i686-linux";
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extra-sandbox-paths = let
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ruleFor = system: cfg.registrations.${system};
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hasWrappedRule = lib.any (system: (ruleFor system).wrapInterpreterInShell) cfg.emulatedSystems;
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in [ "/run/binfmt" ]
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++ lib.optional hasWrappedRule "${pkgs.bash}"
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++ (map (system: (ruleFor system).interpreterSandboxPath) cfg.emulatedSystems);
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};
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environment.etc."binfmt.d/nixos.conf".source = builtins.toFile "binfmt_nixos.conf"
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(lib.concatStringsSep "\n" (lib.mapAttrsToList makeBinfmtLine config.boot.binfmt.registrations));
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system.activationScripts.binfmt = stringAfter [ "specialfs" ] ''
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mkdir -p -m 0755 /run/binfmt
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${lib.concatStringsSep "\n" (lib.mapAttrsToList activationSnippet config.boot.binfmt.registrations)}
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'';
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systemd = lib.mkIf (config.boot.binfmt.registrations != {}) {
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additionalUpstreamSystemUnits = [
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"proc-sys-fs-binfmt_misc.automount"
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"proc-sys-fs-binfmt_misc.mount"
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"systemd-binfmt.service"
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];
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services.systemd-binfmt.restartTriggers = [ (builtins.toJSON config.boot.binfmt.registrations) ];
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};
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};
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}
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