mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-20 21:17:46 +00:00
3ba99f83a7
Enables previously manually disabled stackprotector and stackguard randomization. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=511811: If glibc is built with the --enable-stackguard-randomization option, each application gets a random canary value (at runtime) from /dev/urandom. If --enable-stackguard-randomization is absent, applications get a static canary value of "0xff0a0000". This is very unfortunate, because the attacker may be able to bypass the stack protection mechanism, by placing those 4 bytes in the canary word, before the actual canary check is performed (for example in memcpy-based buffer overflows).
137 lines
4.3 KiB
Nix
137 lines
4.3 KiB
Nix
{ lib, stdenv, fetchurl, linuxHeaders
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, installLocales ? true
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, profilingLibraries ? false
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, gccCross ? null
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, withGd ? false, gd ? null, libpng ? null
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}:
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assert stdenv.cc.isGNU;
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let
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build = import ./common.nix;
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cross = if gccCross != null then gccCross.target else null;
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in
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build cross ({
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name = "glibc" + lib.optionalString withGd "-gd";
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inherit lib stdenv fetchurl linuxHeaders installLocales
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profilingLibraries gccCross withGd gd libpng;
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NIX_NO_SELF_RPATH = true;
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postConfigure = ''
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# Hack: get rid of the `-static' flag set by the bootstrap stdenv.
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# This has to be done *after* `configure' because it builds some
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# test binaries.
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export NIX_CFLAGS_LINK=
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export NIX_LDFLAGS_BEFORE=
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export NIX_DONT_SET_RPATH=1
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unset CFLAGS
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# Apparently --bindir is not respected.
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makeFlagsArray+=("bindir=$bin/bin" "sbindir=$bin/sbin" "rootsbindir=$bin/sbin")
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'';
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# The stackprotector and fortify hardening flags are autodetected by glibc
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# and enabled by default if supported. Setting it for every gcc invocation
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# does not work.
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hardeningDisable = [ "stackprotector" "fortify" ];
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# When building glibc from bootstrap-tools, we need libgcc_s at RPATH for
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# any program we run, because the gcc will have been placed at a new
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# store path than that determined when built (as a source for the
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# bootstrap-tools tarball)
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# Building from a proper gcc staying in the path where it was installed,
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# libgcc_s will not be at {gcc}/lib, and gcc's libgcc will be found without
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# any special hack.
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preInstall = ''
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if [ -f ${stdenv.cc.cc}/lib/libgcc_s.so.1 ]; then
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mkdir -p $out/lib
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cp ${stdenv.cc.cc}/lib/libgcc_s.so.1 $out/lib/libgcc_s.so.1
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# the .so It used to be a symlink, but now it is a script
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cp -a ${stdenv.cc.cc}/lib/libgcc_s.so $out/lib/libgcc_s.so
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fi
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'';
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postInstall = ''
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if test -n "$installLocales"; then
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make -j''${NIX_BUILD_CORES:-1} -l''${NIX_BUILD_CORES:-1} localedata/install-locales
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fi
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test -f $out/etc/ld.so.cache && rm $out/etc/ld.so.cache
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if test -n "$linuxHeaders"; then
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# Include the Linux kernel headers in Glibc, except the `scsi'
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# subdirectory, which Glibc provides itself.
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(cd $dev/include && \
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ln -sv $(ls -d $linuxHeaders/include/* | grep -v scsi\$) .)
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fi
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# Fix for NIXOS-54 (ldd not working on x86_64). Make a symlink
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# "lib64" to "lib".
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if test -n "$is64bit"; then
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ln -s lib $out/lib64
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fi
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# Get rid of more unnecessary stuff.
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rm -rf $out/var $bin/bin/sln
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# For some reason these aren't stripped otherwise and retain reference
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# to bootstrap-tools; on cross-arm this stripping would break objects.
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if [ -z "$crossConfig" ]; then
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for i in "$out"/lib/*.a; do
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strip -S "$i"
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done
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fi
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# Put libraries for static linking in a separate output. Note
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# that libc_nonshared.a and libpthread_nonshared.a are required
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# for dynamically-linked applications.
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mkdir -p $static/lib
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mv $out/lib/*.a $static/lib
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mv $static/lib/lib*_nonshared.a $out/lib
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# Work around a Nix bug: hard links across outputs cause a build failure.
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cp $bin/bin/getconf $bin/bin/getconf_
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mv $bin/bin/getconf_ $bin/bin/getconf
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'';
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separateDebugInfo = true;
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meta.description = "The GNU C Library";
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}
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//
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(if cross != null
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then {
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preConfigure = ''
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sed -i s/-lgcc_eh//g "../$sourceRoot/Makeconfig"
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cat > config.cache << "EOF"
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libc_cv_forced_unwind=yes
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libc_cv_c_cleanup=yes
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libc_cv_gnu89_inline=yes
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# Only due to a problem in gcc configure scripts:
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libc_cv_sparc64_tls=${if cross.withTLS then "yes" else "no"}
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EOF
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export BUILD_CC=gcc
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export CC="$crossConfig-gcc"
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export AR="$crossConfig-ar"
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export RANLIB="$crossConfig-ranlib"
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dontStrip=1
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'';
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preInstall = null; # clobber the native hook
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separateDebugInfo = false; # this is currently broken for crossDrv
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# To avoid a dependency on the build system 'bash'.
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preFixup = ''
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rm $bin/bin/{ldd,tzselect,catchsegv,xtrace}
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'';
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}
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else {}))
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