76c956be5c
Some packages don’t work correctly with pie. Here I disable it for: - busybox - linux kernel - kexectools I also get rid of the Musl conditional for disabling pie in GCC and Binutils. Some day we might want to enable PIE without Musl and it will be useful to have the *just* work with our compiler and linkers.
285 lines
10 KiB
Nix
285 lines
10 KiB
Nix
{ buildPackages, runCommand, nettools, bc, bison, flex, perl, rsync, gmp, libmpc, mpfr, openssl
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, pkgconfig ? null, ncurses ? null
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, libelf
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, utillinux
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, writeTextFile
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}:
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let
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readConfig = configfile: import (runCommand "config.nix" {} ''
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echo "{" > "$out"
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while IFS='=' read key val; do
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[ "x''${key#CONFIG_}" != "x$key" ] || continue
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no_firstquote="''${val#\"}";
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echo ' "'"$key"'" = "'"''${no_firstquote%\"}"'";' >> "$out"
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done < "${configfile}"
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echo "}" >> $out
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'').outPath;
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in {
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# Allow overriding stdenv on each buildLinux call
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stdenv,
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# The kernel version
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version,
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# The version of the kernel module directory
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modDirVersion ? version,
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# The kernel source (tarball, git checkout, etc.)
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src,
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# a list of { name=..., patch=..., extraConfig=...} patches
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kernelPatches ? [],
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# The kernel .config file
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configfile,
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# Manually specified nixexpr representing the config
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# If unspecified, this will be autodetected from the .config
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config ? stdenv.lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
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# Use defaultMeta // extraMeta
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extraMeta ? {},
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# Whether to utilize the controversial import-from-derivation feature to parse the config
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allowImportFromDerivation ? false,
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# ignored
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features ? null,
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}:
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let
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inherit (stdenv.lib)
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hasAttr getAttr optional optionals optionalString optionalAttrs maintainers platforms;
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# Dependencies that are required to build kernel modules
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moduleBuildDependencies = optional (stdenv.lib.versionAtLeast version "4.14") libelf;
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installkernel = writeTextFile { name = "installkernel"; executable=true; text = ''
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#!${stdenv.shell} -e
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mkdir -p $4
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cp -av $2 $4
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cp -av $3 $4
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''; };
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commonMakeFlags = [
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"O=$(buildRoot)"
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] ++ stdenv.lib.optionals (stdenv.hostPlatform.platform ? kernelMakeFlags)
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stdenv.hostPlatform.platform.kernelMakeFlags;
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drvAttrs = config_: platform: kernelPatches: configfile:
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let
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config = let attrName = attr: "CONFIG_" + attr; in {
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isSet = attr: hasAttr (attrName attr) config;
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getValue = attr: if config.isSet attr then getAttr (attrName attr) config else null;
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isYes = attr: (config.getValue attr) == "y";
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isNo = attr: (config.getValue attr) == "n";
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isModule = attr: (config.getValue attr) == "m";
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isEnabled = attr: (config.isModule attr) || (config.isYes attr);
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isDisabled = attr: (!(config.isSet attr)) || (config.isNo attr);
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} // config_;
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isModular = config.isYes "MODULES";
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installsFirmware = (config.isEnabled "FW_LOADER") &&
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(isModular || (config.isDisabled "FIRMWARE_IN_KERNEL")) &&
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(stdenv.lib.versionOlder version "4.14");
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in (optionalAttrs isModular { outputs = [ "out" "dev" ]; }) // {
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passthru = {
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inherit version modDirVersion config kernelPatches configfile
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moduleBuildDependencies stdenv;
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};
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inherit src;
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patches = map (p: p.patch) kernelPatches;
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prePatch = ''
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for mf in $(find -name Makefile -o -name Makefile.include -o -name install.sh); do
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echo "stripping FHS paths in \`$mf'..."
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sed -i "$mf" -e 's|/usr/bin/||g ; s|/bin/||g ; s|/sbin/||g'
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done
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sed -i Makefile -e 's|= depmod|= ${buildPackages.kmod}/bin/depmod|'
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sed -i scripts/ld-version.sh -e "s|/usr/bin/awk|${buildPackages.gawk}/bin/awk|"
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'';
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configurePhase = ''
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runHook preConfigure
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mkdir build
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export buildRoot="$(pwd)/build"
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echo "manual-config configurePhase buildRoot=$buildRoot pwd=$PWD"
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if [ -f "$buildRoot/.config" ]; then
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echo "Could not link $buildRoot/.config : file exists"
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exit 1
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fi
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ln -sv ${configfile} $buildRoot/.config
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# reads the existing .config file and prompts the user for options in
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# the current kernel source that are not found in the file.
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make $makeFlags "''${makeFlagsArray[@]}" oldconfig
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runHook postConfigure
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make $makeFlags "''${makeFlagsArray[@]}" prepare
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actualModDirVersion="$(cat $buildRoot/include/config/kernel.release)"
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if [ "$actualModDirVersion" != "${modDirVersion}" ]; then
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echo "Error: modDirVersion ${modDirVersion} specified in the Nix expression is wrong, it should be: $actualModDirVersion"
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exit 1
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fi
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# Note: we can get rid of this once http://permalink.gmane.org/gmane.linux.kbuild.devel/13800 is merged.
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buildFlagsArray+=("KBUILD_BUILD_TIMESTAMP=$(date -u -d @$SOURCE_DATE_EPOCH)")
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cd $buildRoot
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'';
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buildFlags = [
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"KBUILD_BUILD_VERSION=1-NixOS"
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platform.kernelTarget
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"vmlinux" # for "perf" and things like that
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] ++ optional isModular "modules";
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installFlags = [
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"INSTALLKERNEL=${installkernel}"
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"INSTALL_PATH=$(out)"
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] ++ (optional isModular "INSTALL_MOD_PATH=$(out)")
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++ optional installsFirmware "INSTALL_FW_PATH=$(out)/lib/firmware";
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# Some image types need special install targets (e.g. uImage is installed with make uinstall)
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installTargets = [ (
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if platform ? kernelInstallTarget then platform.kernelInstallTarget
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else if platform.kernelTarget == "uImage" then "uinstall"
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else if platform.kernelTarget == "zImage" || platform.kernelTarget == "Image.gz" then "zinstall"
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else "install"
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) ];
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postInstall = (optionalString installsFirmware ''
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mkdir -p $out/lib/firmware
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'') + (if (platform ? kernelDTB && platform.kernelDTB) then ''
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make $makeFlags "''${makeFlagsArray[@]}" dtbs dtbs_install INSTALL_DTBS_PATH=$out/dtbs
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'' else "") + (if isModular then ''
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mkdir -p $dev
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cp vmlinux $dev/
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if [ -z "$dontStrip" ]; then
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installFlagsArray+=("INSTALL_MOD_STRIP=1")
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fi
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make modules_install $makeFlags "''${makeFlagsArray[@]}" \
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$installFlags "''${installFlagsArray[@]}"
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unlink $out/lib/modules/${modDirVersion}/build
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unlink $out/lib/modules/${modDirVersion}/source
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mkdir -p $dev/lib/modules/${modDirVersion}/{build,source}
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# To save space, exclude a bunch of unneeded stuff when copying.
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(cd .. && rsync --archive --prune-empty-dirs \
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--exclude='/build/' \
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--exclude='/Documentation/' \
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* $dev/lib/modules/${modDirVersion}/source/)
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cd $dev/lib/modules/${modDirVersion}/source
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cp $buildRoot/{.config,Module.symvers} $dev/lib/modules/${modDirVersion}/build
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make modules_prepare $makeFlags "''${makeFlagsArray[@]}" O=$dev/lib/modules/${modDirVersion}/build
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# Keep some extra files on some arches (powerpc, aarch64)
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for f in arch/powerpc/lib/crtsavres.o arch/arm64/kernel/ftrace-mod.o; do
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if [ -f "$buildRoot/$f" ]; then
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cp $buildRoot/$f $dev/lib/modules/${modDirVersion}/build/$f
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fi
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done
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# !!! No documentation on how much of the source tree must be kept
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# If/when kernel builds fail due to missing files, you can add
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# them here. Note that we may see packages requiring headers
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# from drivers/ in the future; it adds 50M to keep all of its
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# headers on 3.10 though.
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chmod u+w -R ..
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arch=$(cd $dev/lib/modules/${modDirVersion}/build/arch; ls)
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# Remove unused arches
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for d in $(cd arch/; ls); do
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if [ "$d" = "$arch" ]; then continue; fi
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if [ "$arch" = arm64 ] && [ "$d" = arm ]; then continue; fi
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rm -rf arch/$d
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done
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# Remove all driver-specific code (50M of which is headers)
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rm -fR drivers
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# Keep all headers
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find . -type f -name '*.h' -print0 | xargs -0 chmod u-w
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# Keep linker scripts (they are required for out-of-tree modules on aarch64)
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find . -type f -name '*.lds' -print0 | xargs -0 chmod u-w
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# Keep root and arch-specific Makefiles
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chmod u-w Makefile
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chmod u-w arch/$arch/Makefile*
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# Keep whole scripts dir
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chmod u-w -R scripts
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# Delete everything not kept
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find . -type f -perm -u=w -print0 | xargs -0 rm
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# Delete empty directories
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find -empty -type d -delete
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# Remove reference to kmod
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sed -i Makefile -e 's|= ${buildPackages.kmod}/bin/depmod|= depmod|'
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'' else optionalString installsFirmware ''
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make firmware_install $makeFlags "''${makeFlagsArray[@]}" \
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$installFlags "''${installFlagsArray[@]}"
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'');
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requiredSystemFeatures = [ "big-parallel" ];
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meta = {
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description =
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"The Linux kernel" +
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(if kernelPatches == [] then "" else
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" (with patches: "
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+ stdenv.lib.concatStringsSep ", " (map (x: x.name) kernelPatches)
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+ ")");
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license = stdenv.lib.licenses.gpl2;
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homepage = https://www.kernel.org/;
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repositories.git = https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git;
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maintainers = [
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maintainers.thoughtpolice
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];
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platforms = platforms.linux;
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timeout = 14400; # 4 hours
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} // extraMeta;
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};
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in
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assert stdenv.lib.versionAtLeast version "4.14" -> libelf != null;
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assert stdenv.lib.versionAtLeast version "4.15" -> utillinux != null;
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stdenv.mkDerivation ((drvAttrs config stdenv.hostPlatform.platform kernelPatches configfile) // {
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name = "linux-${version}";
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enableParallelBuilding = true;
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depsBuildBuild = [ buildPackages.stdenv.cc ];
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nativeBuildInputs = [ perl bc nettools openssl rsync gmp libmpc mpfr ]
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++ optional (stdenv.hostPlatform.platform.kernelTarget == "uImage") buildPackages.ubootTools
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++ optional (stdenv.lib.versionAtLeast version "4.14") libelf
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++ optional (stdenv.lib.versionAtLeast version "4.15") utillinux
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++ optionals (stdenv.lib.versionAtLeast version "4.16") [ bison flex ]
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++ optionals stdenv.lib.inNixShell [ pkgconfig ncurses ]
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;
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hardeningDisable = [ "bindnow" "format" "fortify" "stackprotector" "pic" "pie" ];
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# Absolute paths for compilers avoid any PATH-clobbering issues.
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makeFlags = commonMakeFlags ++ [
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"CC=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
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"HOSTCC=${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}cc"
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"ARCH=${stdenv.hostPlatform.platform.kernelArch}"
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] ++ stdenv.lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
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"CROSS_COMPILE=${stdenv.cc.targetPrefix}"
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];
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karch = stdenv.hostPlatform.platform.kernelArch;
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})
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