From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- build/unix/aix.exp | 5 + .../3A24BC1E8FB409FA9F14371813FCEF89DD9E3C4F.key | 51 + build/unix/build-binutils/build-binutils.sh | 104 ++ .../07F3DBBECC1A39605078094D980C197698C3739D.key | 53 + .../13975A70E63C361C73AE69EF6EEB81F8981C74C7.key | 82 ++ .../33C235A34C46AA3FFB293709A328C3A2C3C45C06.key | 33 + .../343C2FF0FBEE5EC2EDBEF399F3599FF828C67298.key | 35 + .../5ED46A6721D365587791E2AA783FCD8E58BCAFBA.key | 38 + .../7F74F97C103468EE5D750B583AB00996FC26A641.key | 54 + .../AD17A21EF8AED8F1CC02DBD9F7D5C9BF765C61E3.key | 57 + .../D3A93CAD751C2AF4F8C7AD516C35B99309B5FA62.key | 62 + .../DA23579A74D4AD9AF9D3F945CEFAC8EAAF17519D.key | 52 + .../EAF1C276A747E9ED86210CBAC3126D3B4AE55E93.key | 29 + build/unix/build-gcc/build-gcc.sh | 64 + build/unix/build-hfsplus/build-hfsplus.sh | 49 + build/unix/elfhack/Makefile.in | 44 + build/unix/elfhack/README | 28 + build/unix/elfhack/dummy.c | 7 + build/unix/elfhack/elf.cpp | 935 +++++++++++++ build/unix/elfhack/elfhack.cpp | 1450 ++++++++++++++++++++ build/unix/elfhack/elfxx.h | 701 ++++++++++ build/unix/elfhack/inject.c | 136 ++ build/unix/elfhack/inject/copy_source.py | 10 + build/unix/elfhack/inject/moz.build | 40 + build/unix/elfhack/moz.build | 34 + build/unix/elfhack/test-array.c | 8 + build/unix/elfhack/test-ctors.c | 16 + build/unix/elfhack/test.c | 199 +++ build/unix/moz.build | 12 + build/unix/mozconfig.asan | 14 + build/unix/mozconfig.linux | 21 + build/unix/mozconfig.linux32 | 8 + build/unix/mozconfig.stdcxx | 2 + build/unix/mozconfig.tsan | 17 + build/unix/mozconfig.unix | 36 + build/unix/print-non-newline.sh | 35 + build/unix/rewrite_sanitizer_dylib.py | 124 ++ build/unix/run-gprof.sh | 17 + build/unix/run-hiprof.sh | 25 + build/unix/run-mozilla.sh | 356 +++++ build/unix/run-third.sh | 25 + build/unix/stdc++compat/hide_std.ld | 5 + build/unix/stdc++compat/moz.build | 24 + build/unix/stdc++compat/stdc++compat.cpp | 196 +++ 44 files changed, 5293 insertions(+) create mode 100644 build/unix/aix.exp create mode 100644 build/unix/build-binutils/3A24BC1E8FB409FA9F14371813FCEF89DD9E3C4F.key create mode 100755 build/unix/build-binutils/build-binutils.sh create mode 100644 build/unix/build-gcc/07F3DBBECC1A39605078094D980C197698C3739D.key create mode 100644 build/unix/build-gcc/13975A70E63C361C73AE69EF6EEB81F8981C74C7.key create mode 100644 build/unix/build-gcc/33C235A34C46AA3FFB293709A328C3A2C3C45C06.key create mode 100644 build/unix/build-gcc/343C2FF0FBEE5EC2EDBEF399F3599FF828C67298.key create mode 100644 build/unix/build-gcc/5ED46A6721D365587791E2AA783FCD8E58BCAFBA.key create mode 100644 build/unix/build-gcc/7F74F97C103468EE5D750B583AB00996FC26A641.key create mode 100644 build/unix/build-gcc/AD17A21EF8AED8F1CC02DBD9F7D5C9BF765C61E3.key create mode 100644 build/unix/build-gcc/D3A93CAD751C2AF4F8C7AD516C35B99309B5FA62.key create mode 100644 build/unix/build-gcc/DA23579A74D4AD9AF9D3F945CEFAC8EAAF17519D.key create mode 100644 build/unix/build-gcc/EAF1C276A747E9ED86210CBAC3126D3B4AE55E93.key create mode 100755 build/unix/build-gcc/build-gcc.sh create mode 100755 build/unix/build-hfsplus/build-hfsplus.sh create mode 100644 build/unix/elfhack/Makefile.in create mode 100644 build/unix/elfhack/README create mode 100644 build/unix/elfhack/dummy.c create mode 100644 build/unix/elfhack/elf.cpp create mode 100644 build/unix/elfhack/elfhack.cpp create mode 100644 build/unix/elfhack/elfxx.h create mode 100644 build/unix/elfhack/inject.c create mode 100644 build/unix/elfhack/inject/copy_source.py create mode 100644 build/unix/elfhack/inject/moz.build create mode 100644 build/unix/elfhack/moz.build create mode 100644 build/unix/elfhack/test-array.c create mode 100644 build/unix/elfhack/test-ctors.c create mode 100644 build/unix/elfhack/test.c create mode 100644 build/unix/moz.build create mode 100644 build/unix/mozconfig.asan create mode 100644 build/unix/mozconfig.linux create mode 100644 build/unix/mozconfig.linux32 create mode 100644 build/unix/mozconfig.stdcxx create mode 100644 build/unix/mozconfig.tsan create mode 100644 build/unix/mozconfig.unix create mode 100755 build/unix/print-non-newline.sh create mode 100644 build/unix/rewrite_sanitizer_dylib.py create mode 100644 build/unix/run-gprof.sh create mode 100644 build/unix/run-hiprof.sh create mode 100755 build/unix/run-mozilla.sh create mode 100644 build/unix/run-third.sh create mode 100644 build/unix/stdc++compat/hide_std.ld create mode 100644 build/unix/stdc++compat/moz.build create mode 100644 build/unix/stdc++compat/stdc++compat.cpp (limited to 'build/unix') diff --git a/build/unix/aix.exp b/build/unix/aix.exp new file mode 100644 index 0000000000..20f7cb4313 --- /dev/null +++ b/build/unix/aix.exp @@ -0,0 +1,5 @@ +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + +NSGetModule diff --git a/build/unix/build-binutils/3A24BC1E8FB409FA9F14371813FCEF89DD9E3C4F.key b/build/unix/build-binutils/3A24BC1E8FB409FA9F14371813FCEF89DD9E3C4F.key new file mode 100644 index 0000000000..a76485a9fc --- /dev/null +++ b/build/unix/build-binutils/3A24BC1E8FB409FA9F14371813FCEF89DD9E3C4F.key @@ -0,0 +1,51 @@ +-----BEGIN PGP PUBLIC KEY BLOCK----- + +mQINBFm/2cUBEADkvRqMWfAryJ52T4J/640Av5cam9ojdFih9MjcX7QWFxIzJfTF +Yq2z+nb4omdfZosdCJL2zGcn6C0AxpHNvxR9HMDkEyFHKrjDh4xWU+pH4z9azQEq +Jh331X7UzbZldqQo16VkuVavgsTJaHcXm+nGIBTcUbl2oiTtHhmuaYxx6JTMcFjC +7vyO5mLBw78wt52HBYweJ0NjHBvvH/JxbAAULSPRUC61K0exlO49VFbFETQNG1hZ +TKEji95fPbre7PpXQ0ewQShUgttEE/J3UA4jYaF9lOcZgUzbA27xTV//KomP0D30 +yr4e4EJEJYYNKa3hofTEHDXeeNgM25tprhBUMdbVRZpf2Keuk2uDVwc+EiOVri48 +rb1NU+60sOXvoGO6Ks81+mhAGmrBrlgLhAp8K1HPHI4MG4gHnrMqX2rEGUGRPFjC +3qqVVlPm8H05PnosNqDLQ1Pf7C0pVgsCx6hKQB7Y1qBui7aoj9zeFaQgpYef+CEE +RIKEcWwrjaOJwK3pi9HFdxS0NNWYZj8HPzz/AsgTTQdsbulPlVq2SsctmOnL42CZ +OCTppGYwl53CG/EqVY+UQBzFzJBaY8TJRFFYVEy5/HH4H11rMoZwqIkk71EOGU3X +6mWlANRikR3M4GhVITRzuaV69Fed+OeXcCmP94ASLfuhBR2uynmcHpBKpwARAQAB +tDtOaWNrIENsaWZ0b24gKENoaWVmIEJpbnV0aWxzIE1haW50YWluZXIpIDxuaWNr +Y0ByZWRoYXQuY29tPokCOAQTAQIAIgUCWb/ZxQIbAwYLCQgHAwIGFQgCCQoLBBYC +AwECHgECF4AACgkQE/zvid2ePE9cOxAA3cX1bdDaTFttTqukdPXLCtD2aNwJos4v +B4LYPSgugLkYaHIQH9d1NQPhS0TlUeovnFNESLaVsoihv0YmBUCyL4jE52FRoTjE +6fUhYkFNqIWN2HYwkVrSap2UUJFquRVoVbPkbSup8P+D8eydBbdxsY6f+5E8Rtz5 +ibVnPZTib7CyqnFokJITWjzGdIP0Gn+JWVa6jtHTImWx1MtqiuVRDapUhrIoUIjf +98HQn9/N5ylEFYQTw7tzaJNWeGUoGYS8+8n/0sNbuYQUU/zwMVY9wpJcrXaas6yZ +XGpF/tua59t9LFCct+07YAUSWyaBXqBW3PKQz7QP+oE8yje91XrhOQam04eJhPIB +LO88g6/UrdKaY7evBB8bJ76Zpn1yqsYOXwAxifD0gDcRTQcB2s5MYXYmizn2GoUm +1MnCJeAfQCi/YMobR+c8xEEkRU83Tnnw3pmAbRU6OcPihEFuK/+SOMKIuV1QWmjk +bAr4g9XeXvaN+TRJ9Hl/k1k/sj+uOfyGIaFzM/fpaLmFk8vHeej4i2/C6cL4mnah +wYBDHAfHO65ZUIBAssdA6AeJ+PGsYeYhqs6zkpaA2b0wT4f9s7BPSqi0Veky8bUY +YY7WpjzDcHnj1gEeIU55EhOQ42dnEfv7WrIAXanOP8SjhgqAUkb3R88azZCpEMTH +iCE4bFxzOmi5Ag0EWb/ZxQEQALaJE/3u23rTvPLkitaTJFqKkwPVylzkwmKdvd2q +eEFk1qys2J3tACTMyYVnYTSXy5EJH2zJyhUfLnhLp8jJZF4oU5QehOaJPcMmzI/C +ZS1AmH+jnm6pukdZAowTzJyt4IKSapr+7mxcxX1YQ2XewMnFYpLkAA2dHaChLSU/ +EHJXe3+O4DgEURTFMa3SRN/J4GNMBacKXnMSSYylI5DcIOZ/v0IGa5MAXHrP1Hwm +1rBmloIcgmzexczBf+IcWgCLThyFPffv+2pfLK1XaS82OzBC7fS01pB/eDOkjQuK +y16sKZX6Rt57vud40uE5a0lpyItC2P7u7QWL4yT5pMF+oS8bm3YWgEntV380RyZp +qgJGZTZLNq2T4ZgfiaueEV4JzOnG2/QRGjOUrNQaYzKy5V127CTnRg4BYF/uLEmi +zLcI3O3U1+mEz6h48wkAojO1B6AZ8Lm+JuxOW5ouGcrkTEuIG56GcDwMWS/Pw/vN +sDyNmOCjy9eEKWJgmMmLaq59HpfTd8IOeaYyuAQHAsYt/zzKy0giMgjhCQtuc99E +4nQE9KZ44DKsnqRabK9s3zYE3PIkCFIEZcUiJXSXWWOIdJ43j+YyFHU5hqXfECM6 +rzKGBeBUGTzyWcOX6YwRM4LzQDVJwYG8cVfth+v4/ImcXR43D4WVxxBEAjKag02b ++1yfABEBAAGJAh8EGAECAAkFAlm/2cUCGwwACgkQE/zvid2ePE/dqQ/6ApUwgsZz +tps0MOdRddjPwz44pWXS5MG45irMQXELGQyxkrafc8lwHeABYstoK8dpopTcJGE3 +dZGL3JNz1YWxQ5AV4uyqBn5N8RubcA8NzR6DQP+OGPIwzMketvVC/cbbKDZqf0uT +Dy3jP65OFhSkTEIynYv1Mb4JJl3Sq+haUbfWLAV5nboSuHmiZE6Bz2+TjdoVkNwH +Bfpqxu6MlWka+P98SUcmY8iVhPy9QC1XFOGdFDFf1kYgHW27mFwds35NQhNARgft +AVz9FZXruW6tFIIfisjr3rVjD9R8VgL7l5vMr9ylOFpepnI6+wd2X1566HW7F1Zw +1DIrY2NHL7kL5635bHrJY4n7o/n7Elk/Ca/MAqzdIZxz6orfXeImsqZ6ODn4Y47P +ToS3Tr3bMNN9N6tmOPQZkJGHDBExbhAi/Jp8fpWxMmpVCUl6c85cOBCR4s8tZsvG +YOjR3CvqKrX4bb8GElrhOvAJa6DdmZXc7AyoVMaTvhpq3gJYKmC64oqt7zwIHwaC +xTbP6C6oUp9ENRV7nHnXN3BlvIgCo4QEs6HkDzkmgYlCEOKBiDyVMSkPDZdsspa+ +K4GlU2Swi/BDJMjtDxyo+K0M81LXXxOeRfEIfPtZ3ddxBKPva1uSsuz+pbN9d1JY +8Ko5T/h16susi2ReUyNJEJaSnjO5z13TQ1U= +=93P0 +-----END PGP PUBLIC KEY BLOCK----- diff --git a/build/unix/build-binutils/build-binutils.sh b/build/unix/build-binutils/build-binutils.sh new file mode 100755 index 0000000000..3de8d7bc96 --- /dev/null +++ b/build/unix/build-binutils/build-binutils.sh @@ -0,0 +1,104 @@ +#!/bin/bash + +set -x + +make_flags="-j$(nproc)" + +root_dir="$1" + +cd $root_dir/binutils-source + +patch -p1 <<'EOF' +From 4476cc67e657d6b26cd453c555a611f1ab956660 Mon Sep 17 00:00:00 2001 +From: "H.J. Lu" +Date: Thu, 30 Aug 2018 09:21:57 -0700 +Subject: [PATCH] ld: Lookup section in output with the same name + +When there are more than one input sections with the same section name, +SECNAME, linker picks the first one to define __start_SECNAME and +__stop_SECNAME symbols. When the first input section is removed by +comdat group, we need to check if there is still an output section +with section name SECNAME. + + PR ld/23591 + * ldlang.c (undef_start_stop): Lookup section in output with + the same name. +--- + ld/ldlang.c | 18 ++++++++++++++++++ + 1 file changed, 18 insertions(+) + +diff --git a/ld/ldlang.c b/ld/ldlang.c +index 8878ccd..d644b56 100644 +--- a/ld/ldlang.c ++++ b/ld/ldlang.c +@@ -6097,6 +6097,24 @@ undef_start_stop (struct bfd_link_hash_entry *h) + || strcmp (h->u.def.section->name, + h->u.def.section->output_section->name) != 0) + { ++ asection *sec = bfd_get_section_by_name (link_info.output_bfd, ++ h->u.def.section->name); ++ if (sec != NULL) ++ { ++ /* When there are more than one input sections with the same ++ section name, SECNAME, linker picks the first one to define ++ __start_SECNAME and __stop_SECNAME symbols. When the first ++ input section is removed by comdat group, we need to check ++ if there is still an output section with section name ++ SECNAME. */ ++ asection *i; ++ for (i = sec->map_head.s; i != NULL; i = i->map_head.s) ++ if (strcmp (h->u.def.section->name, i->name) == 0) ++ { ++ h->u.def.section = i; ++ return; ++ } ++ } + h->type = bfd_link_hash_undefined; + h->u.undef.abfd = NULL; + } +-- +2.17.1 +EOF + +cd .. + +TARGETS="aarch64-linux-gnu arm-linux-gnueabi i686-w64-mingw32" + +gcc_major=8 +if [ -d $MOZ_FETCHES_DIR/sysroot ]; then + # Don't silently use a non-existing directory for C++ headers. + [ -d $MOZ_FETCHES_DIR/sysroot/usr/include/c++/$gcc_major ] || exit 1 + export CFLAGS="-g -O2 --sysroot=$MOZ_FETCHES_DIR/sysroot" + export CXXFLAGS="$CFLAGS -isystem $MOZ_FETCHES_DIR/sysroot/usr/include/c++/$gcc_major -isystem $MOZ_FETCHES_DIR/sysroot/usr/include/x86_64-linux-gnu/c++/$gcc_major" +fi + +# Build target-specific GNU as ; build them first so that the few documentation +# files they install are overwritten by the full binutils build. + +for target in $TARGETS; do + + mkdir binutils-$target + cd binutils-$target + + ../binutils-source/configure --prefix /tools/binutils/ --disable-gold --disable-ld --disable-binutils --disable-gprof --disable-nls --target=$target $EXTRA_CONFIGURE_FLAGS || exit 1 + make $make_flags || exit 1 + make install $make_flags DESTDIR=$root_dir || exit 1 + + cd .. +done + +# Build binutils +mkdir binutils-objdir +cd binutils-objdir + +# --enable-targets builds extra target support in ld. +# Enabling aarch64 support brings in arm support, so we don't need to specify that too. +../binutils-source/configure --prefix /tools/binutils/ --enable-gold --enable-plugins --disable-nls --enable-targets="$TARGETS" $EXTRA_CONFIGURE_FLAGS || exit 1 +make $make_flags || exit 1 +make install $make_flags DESTDIR=$root_dir || exit 1 + +cd .. + +# Make a package of the built binutils +cd $root_dir/tools +tar caf $root_dir/binutils.tar.zst binutils/ 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binutils will install binaries in a place that gcc will look for them. + binutils_configure_flags="--enable-targets=aarch64-unknown-linux-gnu --build=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --disable-gold --enable-plugins --disable-nls --with-sysroot=/" + fi + + mkdir $root_dir/binutils-objdir + pushd $root_dir/binutils-objdir + ../binutils-source/configure --prefix=${prefix-/tools/gcc}/ $binutils_configure_flags + make $make_flags + make install $make_flags DESTDIR=$root_dir + export PATH=$root_dir/${prefix-/tools/gcc}/bin:$PATH + popd +} + +build_gcc() { + # Be explicit about --build and --target so header and library install + # directories are consistent. + local target="${1:-x86_64-unknown-linux-gnu}" + + mkdir $root_dir/gcc-objdir + pushd $root_dir/gcc-objdir + + if [ -d $MOZ_FETCHES_DIR/sysroot ]; then + EXTRA_CONFIGURE_FLAGS="--with-build-sysroot=$MOZ_FETCHES_DIR/sysroot" + export CFLAGS_FOR_BUILD="--sysroot=$MOZ_FETCHES_DIR/sysroot" + fi + ../gcc-source/configure --prefix=${prefix-/tools/gcc} --build=x86_64-unknown-linux-gnu --target="${target}" --enable-languages=c,c++ --disable-nls --disable-gnu-unique-object --enable-__cxa_atexit --with-arch-32=pentiumpro --with-sysroot=/ $EXTRA_CONFIGURE_FLAGS + make $make_flags + make $make_flags install-strip DESTDIR=$root_dir + + cd $root_dir/tools + ln -s gcc gcc/bin/cc + + tar caf $root_dir/gcc.tar.zst gcc/ + popd +} diff --git a/build/unix/build-hfsplus/build-hfsplus.sh b/build/unix/build-hfsplus/build-hfsplus.sh new file mode 100755 index 0000000000..9e1437002d --- /dev/null +++ b/build/unix/build-hfsplus/build-hfsplus.sh @@ -0,0 +1,49 @@ +#!/bin/bash + +# hfsplus needs to be rebuilt when changing the clang version used to build it. +# Until bug 1471905 is addressed, increase the following number +# when that happens: 1 + +set -e +set -x + +hfplus_version=540.1.linux3 +dirname=diskdev_cmds-${hfplus_version} +make_flags="-j$(nproc)" + +root_dir="$1" +if [ -z "$root_dir" -o ! -d "$root_dir" ]; then + root_dir=$(mktemp -d) +fi +cd $root_dir + +if test -z $TMPDIR; then + TMPDIR=/tmp/ +fi + +# Build +cd $dirname +# We want to statically link against libcrypto. On CentOS, that requires zlib +# and libdl, because of FIPS functions pulling in more than necessary from +# libcrypto (only SHA1 functions are used), but not on Debian, thus +# --as-needed. +patch -p1 << 'EOF' +--- a/newfs_hfs.tproj/Makefile.lnx ++++ b/newfs_hfs.tproj/Makefile.lnx +@@ -6,3 +6,3 @@ + newfs_hfs: $(OFILES) +- ${CC} ${CFLAGS} ${LDFLAGS} -o newfs_hfs ${OFILES} -lcrypto ++ ${CC} ${CFLAGS} ${LDFLAGS} -o newfs_hfs ${OFILES} -Wl,-Bstatic -lcrypto -Wl,-Bdynamic,--as-needed,-lz,-ldl + +EOF +make $make_flags || exit 1 +cd .. + +mkdir hfsplus +cp $dirname/newfs_hfs.tproj/newfs_hfs hfsplus/newfs_hfs +## XXX fsck_hfs is unused, but is small and built from the package. +cp $dirname/fsck_hfs.tproj/fsck_hfs hfsplus/fsck_hfs + +# Make a package of the built utils +cd $root_dir +tar caf $root_dir/hfsplus.tar.zst hfsplus diff --git a/build/unix/elfhack/Makefile.in b/build/unix/elfhack/Makefile.in new file mode 100644 index 0000000000..620f17f3c4 --- /dev/null +++ b/build/unix/elfhack/Makefile.in @@ -0,0 +1,44 @@ +# +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + +include $(topsrcdir)/config/rules.mk + +ifdef COMPILE_ENVIRONMENT +test-array$(DLL_SUFFIX) test-ctors$(DLL_SUFFIX): %$(DLL_SUFFIX): %.$(OBJ_SUFFIX) elfhack + $(MKSHLIB) $(LDFLAGS) $< -nostartfiles + @echo === + @echo === If you get failures below, please file a bug describing the error + @echo === and your environment \(compiler and linker versions\), and + @echo === provide the pre-elfhacked library as an attachment. + @echo === Use --disable-elf-hack until this is fixed. + @echo === + # Fail if the library doesn't have $(DT_TYPE) .dynamic info + $(READELF) -d $@ | grep '($(DT_TYPE))' + @rm -f $@.bak + $(CURDIR)/elfhack -b -f $@ + # Fail if the backup file doesn't exist + [ -f '$@.bak' ] + # Fail if the new library doesn't contain less relocations + [ $$($(READELF) -r $@.bak | wc -l) -gt $$($(READELF) -r $@ | wc -l) ] + +test-array$(DLL_SUFFIX) test-ctors$(DLL_SUFFIX): DSO_SONAME=$@ +test-array$(DLL_SUFFIX): DT_TYPE=INIT_ARRAY +test-ctors$(DLL_SUFFIX): DT_TYPE=INIT + +libs:: test-array$(DLL_SUFFIX) test-ctors$(DLL_SUFFIX) + +.PRECIOUS: test-array$(DLL_SUFFIX) test-ctors$(DLL_SUFFIX) + +ifndef CROSS_COMPILE +dummy: dummy.$(OBJ_SUFFIX) + $(CC) -o $@ $^ $(LDFLAGS) + +libs:: dummy + # Will either crash or return exit code 1 if elfhack is broken + LD_PRELOAD=$(CURDIR)/test-array$(DLL_SUFFIX) $(CURDIR)/dummy + LD_PRELOAD=$(CURDIR)/test-ctors$(DLL_SUFFIX) $(CURDIR)/dummy + +endif +endif diff --git a/build/unix/elfhack/README b/build/unix/elfhack/README new file mode 100644 index 0000000000..8c68031e33 --- /dev/null +++ b/build/unix/elfhack/README @@ -0,0 +1,28 @@ +Elfhack is a program to optimize ELF binaries for size and cold startup +speed. + +Presently, it is quite experimental, though it works well for the target +it was created for: Firefox's libxul.so. + +Elfhack currently only does one thing: packing dynamic relocations ; +which ends up being a quite complex task, that can be summarized this +way: +- Remove RELATIVE relocations from the .rel.dyn/.rela.dyn section. +- Inject a small code able to apply relative relocations "by hand" + after the .rel.dyn/.rela.dyn section. +- Inject a section containing relocative relocations in a different + and more packed format, after the small code. +- Register the small code as DT_INIT function. Make the small code call + what was initially the DT_INIT function, if there was one. +- Remove the hole between the new section containing relative + relocations and the following sections, adjusting offsets and base + addresses accordingly. +- Adjust PT_LOAD entries to fit new offsets, and add an additional + PT_LOAD entry when that is necessary to handle the discrepancy between + offsets and base addresses, meaning the section offsets may yet again + need adjustments. +- Adjust various DT_* dynamic tags to fit the new ELF layout. +- Adjust section headers. +- Adjust ELF headers. + +See http://glandium.org/blog/?p=1177#relocations for some figures. diff --git a/build/unix/elfhack/dummy.c b/build/unix/elfhack/dummy.c new file mode 100644 index 0000000000..2cde16102e --- /dev/null +++ b/build/unix/elfhack/dummy.c @@ -0,0 +1,7 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +extern __attribute__((visibility("default"), weak)) int print_status(); + +int main() { return print_status(); } diff --git a/build/unix/elfhack/elf.cpp b/build/unix/elfhack/elf.cpp new file mode 100644 index 0000000000..b2a21e4901 --- /dev/null +++ b/build/unix/elfhack/elf.cpp @@ -0,0 +1,935 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#undef NDEBUG +#include +#include +#include "elfxx.h" + +template +void Elf_Ehdr_Traits::swap(T& t, R& r) { + memcpy(r.e_ident, t.e_ident, sizeof(r.e_ident)); + r.e_type = endian::swap(t.e_type); + r.e_machine = endian::swap(t.e_machine); + r.e_version = endian::swap(t.e_version); + r.e_entry = endian::swap(t.e_entry); + r.e_phoff = endian::swap(t.e_phoff); + r.e_shoff = endian::swap(t.e_shoff); + r.e_flags = endian::swap(t.e_flags); + r.e_ehsize = endian::swap(t.e_ehsize); + r.e_phentsize = endian::swap(t.e_phentsize); + r.e_phnum = endian::swap(t.e_phnum); + r.e_shentsize = endian::swap(t.e_shentsize); + r.e_shnum = endian::swap(t.e_shnum); + r.e_shstrndx = endian::swap(t.e_shstrndx); +} + +template +void Elf_Phdr_Traits::swap(T& t, R& r) { + r.p_type = endian::swap(t.p_type); + r.p_offset = endian::swap(t.p_offset); + r.p_vaddr = endian::swap(t.p_vaddr); + r.p_paddr = endian::swap(t.p_paddr); + r.p_filesz = endian::swap(t.p_filesz); + r.p_memsz = endian::swap(t.p_memsz); + r.p_flags = endian::swap(t.p_flags); + r.p_align = endian::swap(t.p_align); +} + +template +void Elf_Shdr_Traits::swap(T& t, R& r) { + r.sh_name = endian::swap(t.sh_name); + r.sh_type = endian::swap(t.sh_type); + r.sh_flags = endian::swap(t.sh_flags); + r.sh_addr = endian::swap(t.sh_addr); + r.sh_offset = endian::swap(t.sh_offset); + r.sh_size = endian::swap(t.sh_size); + r.sh_link = endian::swap(t.sh_link); + r.sh_info = endian::swap(t.sh_info); + r.sh_addralign = endian::swap(t.sh_addralign); + r.sh_entsize = endian::swap(t.sh_entsize); +} + +template +void Elf_Dyn_Traits::swap(T& t, R& r) { + r.d_tag = endian::swap(t.d_tag); + r.d_un.d_val = endian::swap(t.d_un.d_val); +} + +template +void Elf_Sym_Traits::swap(T& t, R& r) { + r.st_name = endian::swap(t.st_name); + r.st_value = endian::swap(t.st_value); + r.st_size = endian::swap(t.st_size); + r.st_info = t.st_info; + r.st_other = t.st_other; + r.st_shndx = endian::swap(t.st_shndx); +} + +template +struct _Rel_info { + static inline void swap(Elf32_Word& t, Elf32_Word& r) { r = endian::swap(t); } + static inline void swap(Elf64_Xword& t, Elf64_Xword& r) { + r = endian::swap(t); + } + static inline void swap(Elf64_Xword& t, Elf32_Word& r) { + r = endian::swap(ELF32_R_INFO(ELF64_R_SYM(t), ELF64_R_TYPE(t))); + } + static inline void swap(Elf32_Word& t, Elf64_Xword& r) { + r = endian::swap(ELF64_R_INFO(ELF32_R_SYM(t), ELF32_R_TYPE(t))); + } +}; + +template +void Elf_Rel_Traits::swap(T& t, R& r) { + r.r_offset = endian::swap(t.r_offset); + _Rel_info::swap(t.r_info, r.r_info); +} + +template +void Elf_Rela_Traits::swap(T& t, R& r) { + r.r_offset = endian::swap(t.r_offset); + _Rel_info::swap(t.r_info, r.r_info); + r.r_addend = endian::swap(t.r_addend); +} + +static const Elf64_Shdr null64_section = {0, SHT_NULL, 0, 0, 0, + 0, SHN_UNDEF, 0, 0, 0}; + +Elf_Shdr null_section(null64_section); + +Elf_Ehdr::Elf_Ehdr(std::ifstream& file, unsigned char ei_class, + unsigned char ei_data) + : serializable(file, ei_class, ei_data), + ElfSection(null_section, nullptr, nullptr) { + shdr.sh_size = Elf_Ehdr::size(ei_class); +} + +Elf::Elf(std::ifstream& file) { + if (!file.is_open()) throw std::runtime_error("Error opening file"); + + file.exceptions(std::ifstream::eofbit | std::ifstream::failbit | + std::ifstream::badbit); + // Read ELF magic number and identification information + unsigned char e_ident[EI_VERSION]; + file.seekg(0); + file.read((char*)e_ident, sizeof(e_ident)); + file.seekg(0); + ehdr = new Elf_Ehdr(file, e_ident[EI_CLASS], e_ident[EI_DATA]); + + // ELFOSABI_LINUX is kept unsupported because I haven't looked whether + // STB_GNU_UNIQUE or STT_GNU_IFUNC would need special casing. + if ((ehdr->e_ident[EI_OSABI] != ELFOSABI_NONE) && + (ehdr->e_ident[EI_ABIVERSION] != 0)) + throw std::runtime_error("unsupported ELF ABI"); + + if (ehdr->e_version != 1) throw std::runtime_error("unsupported ELF version"); + + // Sanity checks + if (ehdr->e_shnum == 0) + throw std::runtime_error("sstripped ELF files aren't supported"); + + if (ehdr->e_ehsize != Elf_Ehdr::size(e_ident[EI_CLASS])) + throw std::runtime_error( + "unsupported ELF inconsistency: ehdr.e_ehsize != sizeof(ehdr)"); + + if (ehdr->e_shentsize != Elf_Shdr::size(e_ident[EI_CLASS])) + throw std::runtime_error( + "unsupported ELF inconsistency: ehdr.e_shentsize != sizeof(shdr)"); + + if (ehdr->e_phnum == 0) { + if (ehdr->e_phoff != 0) + throw std::runtime_error( + "unsupported ELF inconsistency: e_phnum == 0 && e_phoff != 0"); + if (ehdr->e_phentsize != 0) + throw std::runtime_error( + "unsupported ELF inconsistency: e_phnum == 0 && e_phentsize != 0"); + } else if (ehdr->e_phoff != ehdr->e_ehsize) + throw std::runtime_error( + "unsupported ELF inconsistency: ehdr->e_phoff != ehdr->e_ehsize"); + else if (ehdr->e_phentsize != Elf_Phdr::size(e_ident[EI_CLASS])) + throw std::runtime_error( + "unsupported ELF inconsistency: ehdr->e_phentsize != sizeof(phdr)"); + + // Read section headers + Elf_Shdr** shdr = new Elf_Shdr*[ehdr->e_shnum]; + file.seekg(ehdr->e_shoff); + for (int i = 0; i < ehdr->e_shnum; i++) + shdr[i] = new Elf_Shdr(file, e_ident[EI_CLASS], e_ident[EI_DATA]); + + // Sanity check in section header for index 0 + if ((shdr[0]->sh_name != 0) || (shdr[0]->sh_type != SHT_NULL) || + (shdr[0]->sh_flags != 0) || (shdr[0]->sh_addr != 0) || + (shdr[0]->sh_offset != 0) || (shdr[0]->sh_size != 0) || + (shdr[0]->sh_link != SHN_UNDEF) || (shdr[0]->sh_info != 0) || + (shdr[0]->sh_addralign != 0) || (shdr[0]->sh_entsize != 0)) + throw std::runtime_error( + "Section header for index 0 contains unsupported values"); + + if ((shdr[ehdr->e_shstrndx]->sh_link != 0) || + (shdr[ehdr->e_shstrndx]->sh_info != 0)) + throw std::runtime_error( + "unsupported ELF content: string table with sh_link != 0 || sh_info != " + "0"); + + // Store these temporarily + tmp_shdr = shdr; + tmp_file = &file; + + // Fill sections list + sections = new ElfSection*[ehdr->e_shnum]; + for (int i = 0; i < ehdr->e_shnum; i++) sections[i] = nullptr; + for (int i = 1; i < ehdr->e_shnum; i++) { + // The .dynamic section is going to have references to other sections, + // so it's better to start with that one and recursively initialize those + // other sections first, to avoid possible infinite recursion (bug 1606739). + if (tmp_shdr[i]->sh_type == SHT_DYNAMIC) { + getSection(i); + } + } + for (int i = 1; i < ehdr->e_shnum; i++) { + if (sections[i] != nullptr) continue; + getSection(i); + } + Elf_Shdr s; + s.sh_name = 0; + s.sh_type = SHT_NULL; + s.sh_flags = 0; + s.sh_addr = 0; + s.sh_offset = ehdr->e_shoff; + s.sh_entsize = Elf_Shdr::size(e_ident[EI_CLASS]); + s.sh_size = s.sh_entsize * ehdr->e_shnum; + s.sh_link = 0; + s.sh_info = 0; + s.sh_addralign = (e_ident[EI_CLASS] == ELFCLASS32) ? 4 : 8; + shdr_section = new ElfSection(s, nullptr, nullptr); + + // Fake section for program headers + s.sh_offset = ehdr->e_phoff; + s.sh_addr = ehdr->e_phoff; + s.sh_entsize = Elf_Phdr::size(e_ident[EI_CLASS]); + s.sh_size = s.sh_entsize * ehdr->e_phnum; + phdr_section = new ElfSection(s, nullptr, nullptr); + + phdr_section->insertAfter(ehdr, false); + + sections[1]->insertAfter(phdr_section, false); + for (int i = 2; i < ehdr->e_shnum; i++) { + // TODO: this should be done in a better way + if ((shdr_section->getPrevious() == nullptr) && + (shdr[i]->sh_offset > ehdr->e_shoff)) { + shdr_section->insertAfter(sections[i - 1], false); + sections[i]->insertAfter(shdr_section, false); + } else + sections[i]->insertAfter(sections[i - 1], false); + } + if (shdr_section->getPrevious() == nullptr) + shdr_section->insertAfter(sections[ehdr->e_shnum - 1], false); + + tmp_file = nullptr; + tmp_shdr = nullptr; + for (int i = 0; i < ehdr->e_shnum; i++) delete shdr[i]; + delete[] shdr; + + eh_shstrndx = (ElfStrtab_Section*)sections[ehdr->e_shstrndx]; + + // Skip reading program headers if there aren't any + if (ehdr->e_phnum == 0) return; + + bool adjusted_phdr_section = false; + // Read program headers + file.seekg(ehdr->e_phoff); + for (int i = 0; i < ehdr->e_phnum; i++) { + Elf_Phdr phdr(file, e_ident[EI_CLASS], e_ident[EI_DATA]); + if (phdr.p_type == PT_LOAD) { + // Default alignment for PT_LOAD on x86-64 prevents elfhack from + // doing anything useful. However, the system doesn't actually + // require such a big alignment, so in order for elfhack to work + // efficiently, reduce alignment when it's originally the default + // one. + if ((ehdr->e_machine == EM_X86_64) && (phdr.p_align == 0x200000)) + phdr.p_align = 0x1000; + } + ElfSegment* segment = new ElfSegment(&phdr); + // Some segments aren't entirely filled (if at all) by sections + // For those, we use fake sections + if ((phdr.p_type == PT_LOAD) && (phdr.p_offset == 0)) { + // Use a fake section for ehdr and phdr + ehdr->getShdr().sh_addr = phdr.p_vaddr; + if (!adjusted_phdr_section) { + phdr_section->getShdr().sh_addr += phdr.p_vaddr; + adjusted_phdr_section = true; + } + segment->addSection(ehdr); + segment->addSection(phdr_section); + } + if (phdr.p_type == PT_PHDR) { + if (!adjusted_phdr_section) { + phdr_section->getShdr().sh_addr = phdr.p_vaddr; + adjusted_phdr_section = true; + } + segment->addSection(phdr_section); + } + for (int j = 1; j < ehdr->e_shnum; j++) + if (phdr.contains(sections[j])) segment->addSection(sections[j]); + // Make sure that our view of segments corresponds to the original + // ELF file. + // GNU gold likes to start some segments before the first section + // they contain. https://sourceware.org/bugzilla/show_bug.cgi?id=19392 + unsigned int gold_adjustment = segment->getAddr() - phdr.p_vaddr; + assert(segment->getFileSize() == phdr.p_filesz - gold_adjustment); + // gold makes TLS segments end on an aligned virtual address, even + // when the underlying section ends before that, while bfd ld + // doesn't. It's fine if we don't keep that alignment. + unsigned int memsize = segment->getMemSize(); + if (phdr.p_type == PT_TLS && memsize != phdr.p_memsz) { + unsigned int align = segment->getAlign(); + memsize = (memsize + align - 1) & ~(align - 1); + } + assert(memsize == phdr.p_memsz - gold_adjustment); + segments.push_back(segment); + } + + new (&eh_entry) ElfLocation(ehdr->e_entry, this); +} + +Elf::~Elf() { + for (std::vector::iterator seg = segments.begin(); + seg != segments.end(); seg++) + delete *seg; + delete[] sections; + ElfSection* section = ehdr; + while (section != nullptr) { + ElfSection* next = section->getNext(); + delete section; + section = next; + } +} + +// TODO: This shouldn't fail after inserting sections +ElfSection* Elf::getSection(int index) { + if ((index < -1) || (index >= ehdr->e_shnum)) + throw std::runtime_error("Section index out of bounds"); + if (index == -1) + index = ehdr->e_shstrndx; // TODO: should be fixed to use the actual + // current number + // Special case: the section at index 0 is void + if (index == 0) return nullptr; + // Infinite recursion guard + if (sections[index] == (ElfSection*)this) return nullptr; + if (sections[index] == nullptr) { + sections[index] = (ElfSection*)this; + switch (tmp_shdr[index]->sh_type) { + case SHT_DYNAMIC: + sections[index] = + new ElfDynamic_Section(*tmp_shdr[index], tmp_file, this); + break; + case SHT_REL: + sections[index] = + new ElfRel_Section(*tmp_shdr[index], tmp_file, this); + break; + case SHT_RELA: + sections[index] = + new ElfRel_Section(*tmp_shdr[index], tmp_file, this); + break; + case SHT_DYNSYM: + case SHT_SYMTAB: + sections[index] = + new ElfSymtab_Section(*tmp_shdr[index], tmp_file, this); + break; + case SHT_STRTAB: + sections[index] = + new ElfStrtab_Section(*tmp_shdr[index], tmp_file, this); + break; + default: + sections[index] = new ElfSection(*tmp_shdr[index], tmp_file, this); + } + } + return sections[index]; +} + +ElfSection* Elf::getSectionAt(Elf64_Off offset) { + for (int i = 1; i < ehdr->e_shnum; i++) { + ElfSection* section = getSection(i); + if ((section != nullptr) && (section->getFlags() & SHF_ALLOC) && + !(section->getFlags() & SHF_TLS) && (offset >= section->getAddr()) && + (offset < section->getAddr() + section->getSize())) + return section; + } + return nullptr; +} + +ElfSegment* Elf::getSegmentByType(unsigned int type, ElfSegment* last) { + std::vector::iterator seg; + if (last) { + seg = std::find(segments.begin(), segments.end(), last); + ++seg; + } else + seg = segments.begin(); + for (; seg != segments.end(); seg++) + if ((*seg)->getType() == type) return *seg; + return nullptr; +} + +void Elf::removeSegment(ElfSegment* segment) { + if (!segment) return; + std::vector::iterator seg; + seg = std::find(segments.begin(), segments.end(), segment); + if (seg == segments.end()) return; + segment->clear(); + segments.erase(seg); +} + +ElfDynamic_Section* Elf::getDynSection() { + for (std::vector::iterator seg = segments.begin(); + seg != segments.end(); seg++) + if (((*seg)->getType() == PT_DYNAMIC) && + ((*seg)->getFirstSection() != nullptr) && + (*seg)->getFirstSection()->getType() == SHT_DYNAMIC) + return (ElfDynamic_Section*)(*seg)->getFirstSection(); + + return nullptr; +} + +void Elf::normalize() { + // fixup section headers sh_name; TODO: that should be done by sections + // themselves + for (ElfSection* section = ehdr; section != nullptr; + section = section->getNext()) { + if (section->getIndex() == 0) + continue; + else + ehdr->e_shnum = section->getIndex() + 1; + section->getShdr().sh_name = eh_shstrndx->getStrIndex(section->getName()); + } + ehdr->markDirty(); + // Check segments consistency + int i = 0; + for (std::vector::iterator seg = segments.begin(); + seg != segments.end(); seg++, i++) { + std::list::iterator it = (*seg)->begin(); + for (ElfSection* last = *(it++); it != (*seg)->end(); last = *(it++)) { + if (((*it)->getType() != SHT_NOBITS) && + ((*it)->getAddr() - last->getAddr()) != + ((*it)->getOffset() - last->getOffset())) { + throw std::runtime_error("Segments inconsistency"); + } + } + } + + ElfSegment* prevLoad = nullptr; + for (auto& it : segments) { + if (it->getType() == PT_LOAD) { + if (prevLoad) { + size_t alignedPrevEnd = (prevLoad->getAddr() + prevLoad->getMemSize() + + prevLoad->getAlign() - 1) & + ~(prevLoad->getAlign() - 1); + size_t alignedStart = it->getAddr() & ~(it->getAlign() - 1); + if (alignedPrevEnd > alignedStart) { + throw std::runtime_error("Segments overlap"); + } + } + prevLoad = it; + } + } + + // fixup ehdr before writing + if (ehdr->e_phnum != segments.size()) { + ehdr->e_phnum = segments.size(); + phdr_section->getShdr().sh_size = + segments.size() * Elf_Phdr::size(ehdr->e_ident[EI_CLASS]); + phdr_section->getNext()->markDirty(); + } + // fixup shdr before writing + if (ehdr->e_shnum != shdr_section->getSize() / shdr_section->getEntSize()) + shdr_section->getShdr().sh_size = + ehdr->e_shnum * Elf_Shdr::size(ehdr->e_ident[EI_CLASS]); + ehdr->e_shoff = shdr_section->getOffset(); + ehdr->e_entry = eh_entry.getValue(); + ehdr->e_shstrndx = eh_shstrndx->getIndex(); + + // Check sections consistency + unsigned int minOffset = 0; + for (ElfSection* section = ehdr; section != nullptr; + section = section->getNext()) { + unsigned int offset = section->getOffset(); + if (offset < minOffset) { + throw std::runtime_error("Sections overlap"); + } + if (section->getType() != SHT_NOBITS) { + minOffset = offset + section->getSize(); + } + } +} + +void Elf::write(std::ofstream& file) { + normalize(); + for (ElfSection* section = ehdr; section != nullptr; + section = section->getNext()) { + file.seekp(section->getOffset()); + if (section == phdr_section) { + for (std::vector::iterator seg = segments.begin(); + seg != segments.end(); seg++) { + Elf_Phdr phdr; + phdr.p_type = (*seg)->getType(); + phdr.p_flags = (*seg)->getFlags(); + phdr.p_offset = (*seg)->getOffset(); + phdr.p_vaddr = (*seg)->getAddr(); + phdr.p_paddr = phdr.p_vaddr + (*seg)->getVPDiff(); + phdr.p_filesz = (*seg)->getFileSize(); + phdr.p_memsz = (*seg)->getMemSize(); + phdr.p_align = (*seg)->getAlign(); + phdr.serialize(file, ehdr->e_ident[EI_CLASS], ehdr->e_ident[EI_DATA]); + } + } else if (section == shdr_section) { + null_section.serialize(file, ehdr->e_ident[EI_CLASS], + ehdr->e_ident[EI_DATA]); + for (ElfSection* sec = ehdr; sec != nullptr; sec = sec->getNext()) { + if (sec->getType() != SHT_NULL) + sec->getShdr().serialize(file, ehdr->e_ident[EI_CLASS], + ehdr->e_ident[EI_DATA]); + } + } else + section->serialize(file, ehdr->e_ident[EI_CLASS], ehdr->e_ident[EI_DATA]); + } +} + +ElfSection::ElfSection(Elf_Shdr& s, std::ifstream* file, Elf* parent) + : shdr(s), + link(shdr.sh_link == SHN_UNDEF ? nullptr + : parent->getSection(shdr.sh_link)), + next(nullptr), + previous(nullptr), + index(-1) { + if ((file == nullptr) || (shdr.sh_type == SHT_NULL) || + (shdr.sh_type == SHT_NOBITS)) + data = nullptr; + else { + data = static_cast(malloc(shdr.sh_size)); + if (!data) { + throw std::runtime_error("Could not malloc ElfSection data"); + } + auto pos = file->tellg(); + file->seekg(shdr.sh_offset); + file->read(data, shdr.sh_size); + file->seekg(pos); + } + if (shdr.sh_name == 0) + name = nullptr; + else { + ElfStrtab_Section* strtab = (ElfStrtab_Section*)parent->getSection(-1); + // Special case (see elfgeneric.cpp): if strtab is nullptr, the + // section being created is the strtab. + if (strtab == nullptr) + name = &data[shdr.sh_name]; + else + name = strtab->getStr(shdr.sh_name); + } + // Only SHT_REL/SHT_RELA sections use sh_info to store a section + // number. + if ((shdr.sh_type == SHT_REL) || (shdr.sh_type == SHT_RELA)) + info.section = shdr.sh_info ? parent->getSection(shdr.sh_info) : nullptr; + else + info.index = shdr.sh_info; +} + +Elf64_Addr ElfSection::getAddr() { + if (shdr.sh_addr != (Elf64_Addr)-1) return shdr.sh_addr; + + // It should be safe to adjust sh_addr for all allocated sections that + // are neither SHT_NOBITS nor SHT_PROGBITS + if ((previous != nullptr) && isRelocatable()) { + unsigned int addr = previous->getAddr(); + if (previous->getType() != SHT_NOBITS) addr += previous->getSize(); + + if (addr & (getAddrAlign() - 1)) addr = (addr | (getAddrAlign() - 1)) + 1; + + return (shdr.sh_addr = addr); + } + return shdr.sh_addr; +} + +Elf64_Off ElfSection::getOffset() { + if (shdr.sh_offset != (Elf64_Off)-1) return shdr.sh_offset; + + if (previous == nullptr) return (shdr.sh_offset = 0); + + Elf64_Off offset = previous->getOffset(); + + ElfSegment* ptload = getSegmentByType(PT_LOAD); + ElfSegment* prev_ptload = previous->getSegmentByType(PT_LOAD); + + if (ptload && (ptload == prev_ptload)) { + offset += getAddr() - previous->getAddr(); + return (shdr.sh_offset = offset); + } + + if (previous->getType() != SHT_NOBITS) offset += previous->getSize(); + + Elf32_Word align = 0x1000; + for (std::vector::iterator seg = segments.begin(); + seg != segments.end(); seg++) + align = std::max(align, (*seg)->getAlign()); + + Elf32_Word mask = align - 1; + // SHF_TLS is used for .tbss which is some kind of special case. + if (((getType() != SHT_NOBITS) || (getFlags() & SHF_TLS)) && + (getFlags() & SHF_ALLOC)) { + if ((getAddr() & mask) < (offset & mask)) + offset = (offset | mask) + (getAddr() & mask) + 1; + else + offset = (offset & ~mask) + (getAddr() & mask); + } + if ((getType() != SHT_NOBITS) && (offset & (getAddrAlign() - 1))) + offset = (offset | (getAddrAlign() - 1)) + 1; + + return (shdr.sh_offset = offset); +} + +int ElfSection::getIndex() { + if (index != -1) return index; + if (getType() == SHT_NULL) return (index = 0); + ElfSection* reference; + for (reference = previous; + (reference != nullptr) && (reference->getType() == SHT_NULL); + reference = reference->getPrevious()) + ; + if (reference == nullptr) return (index = 1); + return (index = reference->getIndex() + 1); +} + +Elf_Shdr& ElfSection::getShdr() { + getOffset(); + if (shdr.sh_link == (Elf64_Word)-1) + shdr.sh_link = getLink() ? getLink()->getIndex() : 0; + if (shdr.sh_info == (Elf64_Word)-1) + shdr.sh_info = ((getType() == SHT_REL) || (getType() == SHT_RELA)) + ? (getInfo().section ? getInfo().section->getIndex() : 0) + : getInfo().index; + + return shdr; +} + +ElfSegment::ElfSegment(Elf_Phdr* phdr) + : type(phdr->p_type), + v_p_diff(phdr->p_paddr - phdr->p_vaddr), + flags(phdr->p_flags), + align(phdr->p_align), + vaddr(phdr->p_vaddr), + filesz(phdr->p_filesz), + memsz(phdr->p_memsz) {} + +void ElfSegment::addSection(ElfSection* section) { + // Make sure all sections in PT_GNU_RELRO won't be moved by elfhack + assert(!((type == PT_GNU_RELRO) && (section->isRelocatable()))); + + // TODO: Check overlapping sections + std::list::iterator i; + for (i = sections.begin(); i != sections.end(); ++i) + if ((*i)->getAddr() > section->getAddr()) break; + sections.insert(i, section); + section->addToSegment(this); +} + +void ElfSegment::removeSection(ElfSection* section) { + sections.remove(section); + section->removeFromSegment(this); +} + +unsigned int ElfSegment::getFileSize() { + if (type == PT_GNU_RELRO) return filesz; + + if (sections.empty()) return 0; + // Search the last section that is not SHT_NOBITS + std::list::reverse_iterator i; + for (i = sections.rbegin(); + (i != sections.rend()) && ((*i)->getType() == SHT_NOBITS); ++i) + ; + // All sections are SHT_NOBITS + if (i == sections.rend()) return 0; + + unsigned int end = (*i)->getAddr() + (*i)->getSize(); + + return end - sections.front()->getAddr(); +} + +unsigned int ElfSegment::getMemSize() { + if (type == PT_GNU_RELRO) return memsz; + + if (sections.empty()) return 0; + + unsigned int end = sections.back()->getAddr() + sections.back()->getSize(); + + return end - sections.front()->getAddr(); +} + +unsigned int ElfSegment::getOffset() { + if ((type == PT_GNU_RELRO) && !sections.empty() && + (sections.front()->getAddr() != vaddr)) + throw std::runtime_error( + "PT_GNU_RELRO segment doesn't start on a section start"); + + return sections.empty() ? 0 : sections.front()->getOffset(); +} + +unsigned int ElfSegment::getAddr() { + if ((type == PT_GNU_RELRO) && !sections.empty() && + (sections.front()->getAddr() != vaddr)) + throw std::runtime_error( + "PT_GNU_RELRO segment doesn't start on a section start"); + + return sections.empty() ? 0 : sections.front()->getAddr(); +} + +void ElfSegment::clear() { + for (std::list::iterator i = sections.begin(); + i != sections.end(); ++i) + (*i)->removeFromSegment(this); + sections.clear(); +} + +ElfValue* ElfDynamic_Section::getValueForType(unsigned int tag) { + for (unsigned int i = 0; i < shdr.sh_size / shdr.sh_entsize; i++) + if (dyns[i].tag == tag) return dyns[i].value; + + return nullptr; +} + +ElfSection* ElfDynamic_Section::getSectionForType(unsigned int tag) { + ElfValue* value = getValueForType(tag); + return value ? value->getSection() : nullptr; +} + +bool ElfDynamic_Section::setValueForType(unsigned int tag, ElfValue* val) { + unsigned int i; + unsigned int shnum = shdr.sh_size / shdr.sh_entsize; + for (i = 0; (i < shnum) && (dyns[i].tag != DT_NULL); i++) + if (dyns[i].tag == tag) { + delete dyns[i].value; + dyns[i].value = val; + return true; + } + // If we get here, this means we didn't match for the given tag + // Most of the time, there are a few DT_NULL entries, that we can + // use to add our value, but if we are on the last entry, we can't. + if (i >= shnum - 1) return false; + + dyns[i].tag = tag; + dyns[i].value = val; + return true; +} + +ElfDynamic_Section::ElfDynamic_Section(Elf_Shdr& s, std::ifstream* file, + Elf* parent) + : ElfSection(s, file, parent) { + auto pos = file->tellg(); + dyns.resize(s.sh_size / s.sh_entsize); + file->seekg(shdr.sh_offset); + // Here we assume tags refer to only one section (e.g. DT_RELSZ accounts + // for .rel.dyn size) + for (unsigned int i = 0; i < s.sh_size / s.sh_entsize; i++) { + Elf_Dyn dyn(*file, parent->getClass(), parent->getData()); + dyns[i].tag = dyn.d_tag; + switch (dyn.d_tag) { + case DT_NULL: + case DT_SYMBOLIC: + case DT_TEXTREL: + case DT_BIND_NOW: + dyns[i].value = new ElfValue(); + break; + case DT_NEEDED: + case DT_SONAME: + case DT_RPATH: + case DT_PLTREL: + case DT_RUNPATH: + case DT_FLAGS: + case DT_RELACOUNT: + case DT_RELCOUNT: + case DT_VERDEFNUM: + case DT_VERNEEDNUM: + dyns[i].value = new ElfPlainValue(dyn.d_un.d_val); + break; + case DT_PLTGOT: + case DT_HASH: + case DT_STRTAB: + case DT_SYMTAB: + case DT_RELA: + case DT_INIT: + case DT_FINI: + case DT_REL: + case DT_JMPREL: + case DT_INIT_ARRAY: + case DT_FINI_ARRAY: + case DT_GNU_HASH: + case DT_VERSYM: + case DT_VERNEED: + case DT_VERDEF: + dyns[i].value = new ElfLocation(dyn.d_un.d_ptr, parent); + break; + default: + dyns[i].value = nullptr; + } + } + // Another loop to get the section sizes + for (unsigned int i = 0; i < s.sh_size / s.sh_entsize; i++) + switch (dyns[i].tag) { + case DT_PLTRELSZ: + dyns[i].value = new ElfSize(getSectionForType(DT_JMPREL)); + break; + case DT_RELASZ: + dyns[i].value = new ElfSize(getSectionForType(DT_RELA)); + break; + case DT_STRSZ: + dyns[i].value = new ElfSize(getSectionForType(DT_STRTAB)); + break; + case DT_RELSZ: + dyns[i].value = new ElfSize(getSectionForType(DT_REL)); + break; + case DT_INIT_ARRAYSZ: + dyns[i].value = new ElfSize(getSectionForType(DT_INIT_ARRAY)); + break; + case DT_FINI_ARRAYSZ: + dyns[i].value = new ElfSize(getSectionForType(DT_FINI_ARRAY)); + break; + case DT_RELAENT: + dyns[i].value = new ElfEntSize(getSectionForType(DT_RELA)); + break; + case DT_SYMENT: + dyns[i].value = new ElfEntSize(getSectionForType(DT_SYMTAB)); + break; + case DT_RELENT: + dyns[i].value = new ElfEntSize(getSectionForType(DT_REL)); + break; + } + + file->seekg(pos); +} + +ElfDynamic_Section::~ElfDynamic_Section() { + for (unsigned int i = 0; i < shdr.sh_size / shdr.sh_entsize; i++) + delete dyns[i].value; +} + +void ElfDynamic_Section::serialize(std::ofstream& file, unsigned char ei_class, + unsigned char ei_data) { + for (unsigned int i = 0; i < shdr.sh_size / shdr.sh_entsize; i++) { + Elf_Dyn dyn; + dyn.d_tag = dyns[i].tag; + dyn.d_un.d_val = (dyns[i].value != nullptr) ? dyns[i].value->getValue() : 0; + dyn.serialize(file, ei_class, ei_data); + } +} + +ElfSymtab_Section::ElfSymtab_Section(Elf_Shdr& s, std::ifstream* file, + Elf* parent) + : ElfSection(s, file, parent) { + auto pos = file->tellg(); + syms.resize(s.sh_size / s.sh_entsize); + ElfStrtab_Section* strtab = (ElfStrtab_Section*)getLink(); + file->seekg(shdr.sh_offset); + for (unsigned int i = 0; i < shdr.sh_size / shdr.sh_entsize; i++) { + Elf_Sym sym(*file, parent->getClass(), parent->getData()); + syms[i].name = strtab->getStr(sym.st_name); + syms[i].info = sym.st_info; + syms[i].other = sym.st_other; + ElfSection* section = + (sym.st_shndx == SHN_ABS) ? nullptr : parent->getSection(sym.st_shndx); + new (&syms[i].value) + ElfLocation(section, sym.st_value, ElfLocation::ABSOLUTE); + syms[i].size = sym.st_size; + syms[i].defined = (sym.st_shndx != SHN_UNDEF); + } + file->seekg(pos); +} + +void ElfSymtab_Section::serialize(std::ofstream& file, unsigned char ei_class, + unsigned char ei_data) { + ElfStrtab_Section* strtab = (ElfStrtab_Section*)getLink(); + for (unsigned int i = 0; i < shdr.sh_size / shdr.sh_entsize; i++) { + Elf_Sym sym; + sym.st_name = strtab->getStrIndex(syms[i].name); + sym.st_info = syms[i].info; + sym.st_other = syms[i].other; + sym.st_value = syms[i].value.getValue(); + ElfSection* section = syms[i].value.getSection(); + if (syms[i].defined) + sym.st_shndx = section ? section->getIndex() : SHN_ABS; + else + sym.st_shndx = SHN_UNDEF; + sym.st_size = syms[i].size; + sym.serialize(file, ei_class, ei_data); + } +} + +Elf_SymValue* ElfSymtab_Section::lookup(const char* name, + unsigned int type_filter) { + for (std::vector::iterator sym = syms.begin(); + sym != syms.end(); sym++) { + if ((type_filter & (1 << ELF32_ST_TYPE(sym->info))) && + (strcmp(sym->name, name) == 0)) { + return &*sym; + } + } + return nullptr; +} + +const char* ElfStrtab_Section::getStr(unsigned int index) { + for (std::vector::iterator t = table.begin(); t != table.end(); + t++) { + if (index < t->used) return t->buf + index; + index -= t->used; + } + assert(1 == 0); + return nullptr; +} + +const char* ElfStrtab_Section::getStr(const char* string) { + if (string == nullptr) return nullptr; + + // If the given string is within the section, return it + for (std::vector::iterator t = table.begin(); t != table.end(); + t++) + if ((string >= t->buf) && (string < t->buf + t->used)) return string; + + // TODO: should scan in the section to find an existing string + + // If not, we need to allocate the string in the section + size_t len = strlen(string) + 1; + + if (table.back().size - table.back().used < len) + table.resize(table.size() + 1); + + char* alloc_str = table.back().buf + table.back().used; + memcpy(alloc_str, string, len); + table.back().used += len; + + shdr.sh_size += len; + markDirty(); + + return alloc_str; +} + +unsigned int ElfStrtab_Section::getStrIndex(const char* string) { + if (string == nullptr) return 0; + + unsigned int index = 0; + string = getStr(string); + for (std::vector::iterator t = table.begin(); t != table.end(); + t++) { + if ((string >= t->buf) && (string < t->buf + t->used)) + return index + (string - t->buf); + index += t->used; + } + + assert(1 == 0); + return 0; +} + +void ElfStrtab_Section::serialize(std::ofstream& file, unsigned char ei_class, + unsigned char ei_data) { + file.seekp(getOffset()); + for (std::vector::iterator t = table.begin(); t != table.end(); + t++) + file.write(t->buf, t->used); +} diff --git a/build/unix/elfhack/elfhack.cpp b/build/unix/elfhack/elfhack.cpp new file mode 100644 index 0000000000..0a056eef19 --- /dev/null +++ b/build/unix/elfhack/elfhack.cpp @@ -0,0 +1,1450 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#undef NDEBUG +#include +#include +#include +#include +#include + +#include "elfxx.h" +#include "mozilla/CheckedInt.h" + +#define ver "1" +#define elfhack_data ".elfhack.data.v" ver +#define elfhack_text ".elfhack.text.v" ver + +#ifndef R_ARM_V4BX +# define R_ARM_V4BX 0x28 +#endif +#ifndef R_ARM_CALL +# define R_ARM_CALL 0x1c +#endif +#ifndef R_ARM_JUMP24 +# define R_ARM_JUMP24 0x1d +#endif +#ifndef R_ARM_THM_JUMP24 +# define R_ARM_THM_JUMP24 0x1e +#endif + +char* rundir = nullptr; + +template +struct wrapped { + T value; +}; + +class Elf_Addr_Traits { + public: + typedef wrapped Type32; + typedef wrapped Type64; + + template + static inline void swap(T& t, R& r) { + r.value = endian::swap(t.value); + } +}; + +typedef serializable Elf_Addr; + +class ElfRelHack_Section : public ElfSection { + public: + ElfRelHack_Section(Elf_Shdr& s) + : ElfSection(s, nullptr, nullptr), + block_size((8 * s.sh_entsize - 1) * s.sh_entsize) { + name = elfhack_data; + }; + + void serialize(std::ofstream& file, unsigned char ei_class, + unsigned char ei_data) { + for (std::vector::iterator i = relr.begin(); i != relr.end(); + ++i) { + Elf_Addr out; + out.value = *i; + out.serialize(file, ei_class, ei_data); + } + } + + bool isRelocatable() { return true; } + + void push_back(Elf64_Addr offset) { + // The format used for the packed relocations is SHT_RELR, described in + // https://groups.google.com/g/generic-abi/c/bX460iggiKg/m/Jnz1lgLJAgAJ + // The gist of it is that an address is recorded, and the following words, + // if their LSB is 1, represent a bitmap of word-size-spaced relocations + // at the addresses that follow. There can be multiple such bitmaps, such + // that very long streaks of (possibly spaced) relocations can be recorded + // in a very compact way. + for (;;) { + // [block_start; block_start + block_size] represents the range of offsets + // the current bitmap can record. If the offset doesn't fall in that + // range, or if doesn't align properly to be recorded, we record the + // bitmap, and slide the block corresponding to a new bitmap. If the + // offset doesn't fall in the range for the new bitmap, or if there wasn't + // an active bitmap in the first place, we record the offset and start a + // new bitmap for the block that follows it. + if (!block_start || offset < block_start || + offset >= block_start + block_size || + (offset - block_start) % shdr.sh_entsize) { + if (bitmap) { + relr.push_back((bitmap << 1) | 1); + block_start += block_size; + bitmap = 0; + continue; + } + relr.push_back(offset); + block_start = offset + shdr.sh_entsize; + break; + } + bitmap |= 1ULL << ((offset - block_start) / shdr.sh_entsize); + break; + } + shdr.sh_size = relr.size() * shdr.sh_entsize; + } + + private: + std::vector relr; + size_t block_size; + Elf64_Addr block_start = 0; + Elf64_Addr bitmap = 0; +}; + +class ElfRelHackCode_Section : public ElfSection { + public: + ElfRelHackCode_Section(Elf_Shdr& s, Elf& e, + ElfRelHack_Section& relhack_section, unsigned int init, + unsigned int mprotect_cb, unsigned int sysconf_cb) + : ElfSection(s, nullptr, nullptr), + parent(e), + relhack_section(relhack_section), + init(init), + init_trampoline(nullptr), + mprotect_cb(mprotect_cb), + sysconf_cb(sysconf_cb) { + std::string file(rundir); + file += "/inject/"; + switch (parent.getMachine()) { + case EM_386: + file += "x86"; + break; + case EM_X86_64: + file += "x86_64"; + break; + case EM_ARM: + file += "arm"; + break; + case EM_AARCH64: + file += "aarch64"; + break; + default: + throw std::runtime_error("unsupported architecture"); + } + file += ".o"; + std::ifstream inject(file.c_str(), std::ios::in | std::ios::binary); + elf = new Elf(inject); + if (elf->getType() != ET_REL) + throw std::runtime_error("object for injected code is not ET_REL"); + if (elf->getMachine() != parent.getMachine()) + throw std::runtime_error( + "architecture of object for injected code doesn't match"); + + ElfSymtab_Section* symtab = nullptr; + + // Find the symbol table. + for (ElfSection* section = elf->getSection(1); section != nullptr; + section = section->getNext()) { + if (section->getType() == SHT_SYMTAB) + symtab = (ElfSymtab_Section*)section; + } + if (symtab == nullptr) + throw std::runtime_error( + "Couldn't find a symbol table for the injected code"); + + relro = parent.getSegmentByType(PT_GNU_RELRO); + + // Find the init symbol + entry_point = -1; + std::string symbol = "init"; + if (!init) symbol += "_noinit"; + if (relro) symbol += "_relro"; + Elf_SymValue* sym = symtab->lookup(symbol.c_str()); + if (!sym) + throw std::runtime_error( + "Couldn't find an 'init' symbol in the injected code"); + + entry_point = sym->value.getValue(); + + // Get all relevant sections from the injected code object. + add_code_section(sym->value.getSection()); + + // If the original init function is located too far away, we're going to + // need to use a trampoline. See comment in inject.c. + // Theoretically, we should check for (init - instr) > 0xffffff, where instr + // is the virtual address of the instruction that calls the original init, + // but we don't have it at this point, so punt to just init. + if (init > 0xffffff && parent.getMachine() == EM_ARM) { + Elf_SymValue* trampoline = symtab->lookup("init_trampoline"); + if (!trampoline) { + throw std::runtime_error( + "Couldn't find an 'init_trampoline' symbol in the injected code"); + } + + init_trampoline = trampoline->value.getSection(); + add_code_section(init_trampoline); + } + + // Adjust code sections offsets according to their size + std::vector::iterator c = code.begin(); + (*c)->getShdr().sh_addr = 0; + for (ElfSection* last = *(c++); c != code.end(); ++c) { + unsigned int addr = last->getShdr().sh_addr + last->getSize(); + if (addr & ((*c)->getAddrAlign() - 1)) + addr = (addr | ((*c)->getAddrAlign() - 1)) + 1; + (*c)->getShdr().sh_addr = addr; + // We need to align this section depending on the greater + // alignment required by code sections. + if (shdr.sh_addralign < (*c)->getAddrAlign()) + shdr.sh_addralign = (*c)->getAddrAlign(); + last = *c; + } + shdr.sh_size = code.back()->getAddr() + code.back()->getSize(); + data = static_cast(malloc(shdr.sh_size)); + if (!data) { + throw std::runtime_error("Could not malloc ElfSection data"); + } + char* buf = data; + for (c = code.begin(); c != code.end(); ++c) { + memcpy(buf, (*c)->getData(), (*c)->getSize()); + buf += (*c)->getSize(); + } + name = elfhack_text; + } + + ~ElfRelHackCode_Section() { delete elf; } + + void serialize(std::ofstream& file, unsigned char ei_class, + unsigned char ei_data) override { + // Readjust code offsets + for (std::vector::iterator c = code.begin(); c != code.end(); + ++c) + (*c)->getShdr().sh_addr += getAddr(); + + // Apply relocations + for (std::vector::iterator c = code.begin(); c != code.end(); + ++c) { + for (ElfSection* rel = elf->getSection(1); rel != nullptr; + rel = rel->getNext()) + if (((rel->getType() == SHT_REL) || (rel->getType() == SHT_RELA)) && + (rel->getInfo().section == *c)) { + if (rel->getType() == SHT_REL) + apply_relocations((ElfRel_Section*)rel, *c); + else + apply_relocations((ElfRel_Section*)rel, *c); + } + } + + ElfSection::serialize(file, ei_class, ei_data); + } + + bool isRelocatable() override { return false; } + + unsigned int getEntryPoint() { return entry_point; } + + void insertBefore(ElfSection* section, bool dirty = true) override { + // Adjust the address so that this section is adjacent to the one it's + // being inserted before. This avoids creating holes which subsequently + // might lead the PHDR-adjusting code to create unnecessary additional + // PT_LOADs. + shdr.sh_addr = + (section->getAddr() - shdr.sh_size) & ~(shdr.sh_addralign - 1); + ElfSection::insertBefore(section, dirty); + } + + private: + void add_code_section(ElfSection* section) { + if (section) { + /* Don't add section if it's already been added in the past */ + for (auto s = code.begin(); s != code.end(); ++s) { + if (section == *s) return; + } + code.push_back(section); + find_code(section); + } + } + + /* Look at the relocations associated to the given section to find other + * sections that it requires */ + void find_code(ElfSection* section) { + for (ElfSection* s = elf->getSection(1); s != nullptr; s = s->getNext()) { + if (((s->getType() == SHT_REL) || (s->getType() == SHT_RELA)) && + (s->getInfo().section == section)) { + if (s->getType() == SHT_REL) + scan_relocs_for_code((ElfRel_Section*)s); + else + scan_relocs_for_code((ElfRel_Section*)s); + } + } + } + + template + void scan_relocs_for_code(ElfRel_Section* rel) { + ElfSymtab_Section* symtab = (ElfSymtab_Section*)rel->getLink(); + for (auto r = rel->rels.begin(); r != rel->rels.end(); ++r) { + ElfSection* section = + symtab->syms[ELF64_R_SYM(r->r_info)].value.getSection(); + add_code_section(section); + } + } + + // TODO: sort out which non-aarch64 relocation types should be using + // `value` (even though in practice it's either 0 or the same as addend) + class pc32_relocation { + public: + Elf32_Addr operator()(unsigned int base_addr, Elf64_Off offset, + Elf64_Sxword addend, unsigned int addr, + Elf64_Word value) { + return addr + addend - offset - base_addr; + } + }; + + class arm_plt32_relocation { + public: + Elf32_Addr operator()(unsigned int base_addr, Elf64_Off offset, + Elf64_Sxword addend, unsigned int addr, + Elf64_Word value) { + // We don't care about sign_extend because the only case where this is + // going to be used only jumps forward. + Elf32_Addr tmp = (Elf32_Addr)(addr - offset - base_addr) >> 2; + tmp = (addend + tmp) & 0x00ffffff; + return (addend & 0xff000000) | tmp; + } + }; + + class arm_thm_jump24_relocation { + public: + Elf32_Addr operator()(unsigned int base_addr, Elf64_Off offset, + Elf64_Sxword addend, unsigned int addr, + Elf64_Word value) { + /* Follows description of b.w and bl instructions as per + ARM Architecture Reference Manual ARM® v7-A and ARM® v7-R edition, + A8.6.16 We limit ourselves to Encoding T4 of b.w and Encoding T1 of bl. + We don't care about sign_extend because the only case where this is + going to be used only jumps forward. */ + Elf32_Addr tmp = (Elf32_Addr)(addr - offset - base_addr); + unsigned int word0 = addend & 0xffff, word1 = addend >> 16; + + /* Encoding T4 of B.W is 10x1 ; Encoding T1 of BL is 11x1. */ + unsigned int type = (word1 & 0xd000) >> 12; + if (((word0 & 0xf800) != 0xf000) || ((type & 0x9) != 0x9)) + throw std::runtime_error( + "R_ARM_THM_JUMP24/R_ARM_THM_CALL relocation only supported for B.W " + "