88e32095e1
Linux has a few PowerPC-specific symbols which are marked as GPL exports; these symbols wound up being exposed in Linux 5.12 and are needed by OpenZFS. The symbol licensing was fixed in mainline 5.19; this commit backports the fix to all previous affected kernels. This commit is required in order to build the NixOS ISO for PowerPC64.
402 lines
16 KiB
Nix
402 lines
16 KiB
Nix
{ lib, stdenv, buildPackages, runCommand, nettools, bc, bison, flex, perl, rsync, gmp, libmpc, mpfr, openssl
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, libelf, cpio, elfutils, zstd, python3Minimal, zlib, pahole
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, fetchpatch
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}:
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let
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lib_ = lib;
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stdenv_ = stdenv;
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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 lib.makeOverridable ({
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# The kernel version
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version,
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# Position of the Linux build expression
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pos ? null,
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# Additional kernel make flags
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extraMakeFlags ? [],
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# The name of the kernel module directory
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# Needs to be X.Y.Z[-extra], so pad with zeros if needed.
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modDirVersion ? lib.versions.pad 3 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 ? lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
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# Custom seed used for CONFIG_GCC_PLUGIN_RANDSTRUCT if enabled. This is
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# automatically extended with extra per-version and per-config values.
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randstructSeed ? "",
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# Extra meta attributes
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extraMeta ? {},
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# for module compatibility
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isZen ? false,
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isLibre ? false,
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isHardened ? false,
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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, lib ? lib_, stdenv ? stdenv_,
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}:
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let
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inherit (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 = [ perl libelf ]
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++ optional (lib.versionAtLeast version "5.13") zstd;
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drvAttrs = config_: kernelConf: 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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buildDTBs = kernelConf.DTB or false;
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installsFirmware = (config.isEnabled "FW_LOADER") &&
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(isModular || (config.isDisabled "FIRMWARE_IN_KERNEL")) &&
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(lib.versionOlder version "4.14");
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in (optionalAttrs isModular { outputs = [ "out" "dev" ]; }) // {
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passthru = rec {
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inherit version modDirVersion config kernelPatches configfile
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moduleBuildDependencies stdenv;
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inherit isZen isHardened isLibre;
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isXen = lib.warn "The isXen attribute is deprecated. All Nixpkgs kernels that support it now have Xen enabled." true;
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baseVersion = lib.head (lib.splitString "-rc" version);
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kernelOlder = lib.versionOlder baseVersion;
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kernelAtLeast = lib.versionAtLeast baseVersion;
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};
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inherit src;
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patches =
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map (p: p.patch) kernelPatches
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# Required for deterministic builds along with some postPatch magic.
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++ optional (lib.versionOlder version "5.19") ./randstruct-provide-seed.patch
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++ optional (lib.versionAtLeast version "5.19") ./randstruct-provide-seed-5.19.patch
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# Fixes determinism by normalizing metadata for the archive of kheaders
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++ optional (lib.versionAtLeast version "5.2" && lib.versionOlder version "5.4") ./gen-kheaders-metadata.patch
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# Linux 5.12 marked certain PowerPC-only symbols as GPL, which breaks
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# OpenZFS; this was fixed in Linux 5.19 so we backport the fix
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# https://github.com/openzfs/zfs/pull/13367
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++ optional (lib.versionAtLeast version "5.12" &&
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lib.versionOlder version "5.19" &&
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stdenv.hostPlatform.isPower)
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(fetchpatch {
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url = "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/patch/?id=d9e5c3e9e75162f845880535957b7fd0b4637d23";
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hash = "sha256-bBOyJcP6jUvozFJU0SPTOf3cmnTQ6ZZ4PlHjiniHXLU=";
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});
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postPatch = ''
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sed -i Makefile -e 's|= depmod|= ${buildPackages.kmod}/bin/depmod|'
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# fixup for pre-5.4 kernels using the $(cd $foo && /bin/pwd) pattern
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# FIXME: remove when no longer needed
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substituteInPlace Makefile tools/scripts/Makefile.include --replace /bin/pwd pwd
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# Don't include a (random) NT_GNU_BUILD_ID, to make the build more deterministic.
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# This way kernels can be bit-by-bit reproducible depending on settings
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# (e.g. MODULE_SIG and SECURITY_LOCKDOWN_LSM need to be disabled).
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# See also https://kernelnewbies.org/BuildId
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sed -i Makefile -e 's|--build-id=[^ ]*|--build-id=none|'
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# Some linux-hardened patches now remove certain files in the scripts directory, so the file may not exist.
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[[ -f scripts/ld-version.sh ]] && patchShebangs scripts/ld-version.sh
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# Set randstruct seed to a deterministic but diversified value. Note:
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# we could have instead patched gen-random-seed.sh to take input from
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# the buildFlags, but that would require also patching the kernel's
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# toplevel Makefile to add a variable export. This would be likely to
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# cause future patch conflicts.
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for file in scripts/gen-randstruct-seed.sh scripts/gcc-plugins/gen-random-seed.sh; do
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if [ -f "$file" ]; then
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substituteInPlace "$file" \
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--replace NIXOS_RANDSTRUCT_SEED \
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$(echo ${randstructSeed}${src} ${placeholder "configfile"} | sha256sum | cut -d ' ' -f 1 | tr -d '\n')
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break
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fi
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done
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patchShebangs scripts
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# also patch arch-specific install scripts
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for i in $(find arch -name install.sh); do
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patchShebangs "$i"
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done
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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 $buildRoot
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'';
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buildFlags = [
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"KBUILD_BUILD_VERSION=1-NixOS"
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kernelConf.target
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"vmlinux" # for "perf" and things like that
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] ++ optional isModular "modules"
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++ optionals buildDTBs ["dtbs" "DTC_FLAGS=-@"]
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++ extraMakeFlags;
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installFlags = [
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"INSTALL_PATH=$(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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++ optionals buildDTBs ["dtbs_install" "INSTALL_DTBS_PATH=$(out)/dtbs"];
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preInstall = let
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# All we really need to do here is copy the final image and System.map to $out,
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# and use the kernel's modules_install, firmware_install, dtbs_install, etc. targets
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# for the rest. Easy, right?
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#
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# Unfortunately for us, the obvious way of getting the built image path,
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# make -s image_name, does not work correctly, because some architectures
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# (*cough* aarch64 *cough*) change KBUILD_IMAGE on the fly in their install targets,
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# so we end up attempting to install the thing we didn't actually build.
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#
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# Thankfully, there's a way out that doesn't involve just hardcoding everything.
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#
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# The kernel has an install target, which runs a pretty simple shell script
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# (located at scripts/install.sh or arch/$arch/boot/install.sh, depending on
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# which kernel version you're looking at) that tries to do something sensible.
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#
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# (it would be great to hijack this script immediately, as it has all the
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# information we need passed to it and we don't need it to try and be smart,
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# but unfortunately, the exact location of the scripts differs between kernel
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# versions, and they're seemingly not considered to be public API at all)
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#
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# One of the ways it tries to discover what "something sensible" actually is
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# is by delegating to what's supposed to be a user-provided install script
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# located at ~/bin/installkernel.
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#
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# (the other options are:
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# - a distribution-specific script at /sbin/installkernel,
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# which we can't really create in the sandbox easily
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# - an architecture-specific script at arch/$arch/boot/install.sh,
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# which attempts to guess _something_ and usually guesses very wrong)
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#
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# More specifically, the install script exec's into ~/bin/installkernel, if one
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# exists, with the following arguments:
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#
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# $1: $KERNELRELEASE - full kernel version string
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# $2: $KBUILD_IMAGE - the final image path
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# $3: System.map - path to System.map file, seemingly hardcoded everywhere
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# $4: $INSTALL_PATH - path to the destination directory as specified in installFlags
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#
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# $2 is exactly what we want, so hijack the script and use the knowledge given to it
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# by the makefile overlords for our own nefarious ends.
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#
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# Note that the makefiles specifically look in ~/bin/installkernel, and
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# writeShellScriptBin writes the script to <store path>/bin/installkernel,
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# so HOME needs to be set to just the store path.
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#
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# FIXME: figure out a less roundabout way of doing this.
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installkernel = buildPackages.writeShellScriptBin "installkernel" ''
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cp -av $2 $4
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cp -av $3 $4
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'';
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in ''
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installFlagsArray+=("-j$NIX_BUILD_CORES")
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export HOME=${installkernel}
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'';
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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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(kernelConf.installTarget or (
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/**/ if kernelConf.target == "uImage" then "uinstall"
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else if kernelConf.target == "zImage" || kernelConf.target == "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 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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* $dev/lib/modules/${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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# For reproducibility, removes accidental leftovers from a `cc1` call
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# from a `try-run` call from the Makefile
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rm -f $dev/lib/modules/${modDirVersion}/build/.[0-9]*.d
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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 -r 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 -r chmod u-w
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# Keep root and arch-specific Makefiles
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chmod u-w Makefile 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 -r 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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+ lib.concatStringsSep ", " (map (x: x.name) kernelPatches)
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+ ")");
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license = lib.licenses.gpl2Only;
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homepage = "https://www.kernel.org/";
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maintainers = lib.teams.linux-kernel.members ++ [
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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 lib.versionOlder version "5.8" -> libelf != null;
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assert lib.versionAtLeast version "5.8" -> elfutils != null;
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stdenv.mkDerivation ((drvAttrs config stdenv.hostPlatform.linux-kernel kernelPatches configfile) // {
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pname = "linux";
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inherit 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 zstd python3Minimal ]
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++ optional (stdenv.hostPlatform.linux-kernel.target == "uImage") buildPackages.ubootTools
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++ optional (lib.versionOlder version "5.8") libelf
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# Removed util-linuxMinimal since it should not be a dependency.
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++ optionals (lib.versionAtLeast version "4.16") [ bison flex ]
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++ optionals (lib.versionAtLeast version "5.2") [ cpio pahole zlib ]
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++ optional (lib.versionAtLeast version "5.8") elfutils
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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 = [
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"O=$(buildRoot)"
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"CC=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
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"HOSTCC=${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}cc"
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"HOSTLD=${buildPackages.stdenv.cc.bintools}/bin/${buildPackages.stdenv.cc.targetPrefix}ld"
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"ARCH=${stdenv.hostPlatform.linuxArch}"
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] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
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"CROSS_COMPILE=${stdenv.cc.targetPrefix}"
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] ++ (stdenv.hostPlatform.linux-kernel.makeFlags or [])
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++ extraMakeFlags;
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karch = stdenv.hostPlatform.linuxArch;
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} // (optionalAttrs (pos != null) { inherit pos; })))
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