diff options
Diffstat (limited to 'sys-devel/mold/files/mold-2.0.0-DT_RELR-dependency.patch')
| -rw-r--r-- | sys-devel/mold/files/mold-2.0.0-DT_RELR-dependency.patch | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/sys-devel/mold/files/mold-2.0.0-DT_RELR-dependency.patch b/sys-devel/mold/files/mold-2.0.0-DT_RELR-dependency.patch deleted file mode 100644 index 267afde230d2..000000000000 --- a/sys-devel/mold/files/mold-2.0.0-DT_RELR-dependency.patch +++ /dev/null @@ -1,161 +0,0 @@ -https://bugs.gentoo.org/911591 -https://bugzilla.mozilla.org/show_bug.cgi?id=1847697 -https://github.com/rui314/mold/issues/653#event-10041847648 -https://github.com/rui314/mold/commit/f467ad1add2ab6e381e0e458f026df197e63d487 - -From f467ad1add2ab6e381e0e458f026df197e63d487 Mon Sep 17 00:00:00 2001 -From: Rui Ueyama <ruiu@bluewhale.systems> -Date: Wed, 9 Aug 2023 11:40:09 +0900 -Subject: [PATCH] Create a symbol version dependency to GLIBC_ABI_DT_RELR - -Fixes https://github.com/rui314/mold/issues/653 ---- - elf/cmdline.cc | 2 ++ - elf/mold.h | 1 + - elf/output-chunks.cc | 44 +++++++++++++++++++++++++----- - test/elf/z-pack-relative-relocs.sh | 16 +++++++++++ - 4 files changed, 56 insertions(+), 7 deletions(-) - create mode 100755 test/elf/z-pack-relative-relocs.sh - -diff --git a/elf/cmdline.cc b/elf/cmdline.cc -index c568ce086..82a0e6869 100644 ---- a/elf/cmdline.cc -+++ b/elf/cmdline.cc -@@ -875,8 +875,10 @@ std::vector<std::string> parse_nonpositional_args(Context<E> &ctx) { - ctx.arg.z_nodefaultlib = true; - } else if (read_z_flag("pack-relative-relocs")) { - ctx.arg.pack_dyn_relocs_relr = true; -+ ctx.arg.z_pack_relative_relocs = true; - } else if (read_z_flag("nopack-relative-relocs")) { - ctx.arg.pack_dyn_relocs_relr = false; -+ ctx.arg.z_pack_relative_relocs = false; - } else if (read_z_flag("separate-loadable-segments")) { - z_separate_code = SEPARATE_LOADABLE_SEGMENTS; - } else if (read_z_flag("separate-code")) { -diff --git a/elf/mold.h b/elf/mold.h -index e5532211c..3a027f1e9 100644 ---- a/elf/mold.h -+++ b/elf/mold.h -@@ -1831,6 +1831,7 @@ struct Context { - bool z_nodefaultlib = false; - bool z_now = false; - bool z_origin = false; -+ bool z_pack_relative_relocs = false; - bool z_relro = true; - bool z_sectionheader = true; - bool z_shstk = false; -diff --git a/elf/output-chunks.cc b/elf/output-chunks.cc -index 726a4da2b..3896a2991 100644 ---- a/elf/output-chunks.cc -+++ b/elf/output-chunks.cc -@@ -2373,12 +2373,13 @@ void VerneedSection<E>::construct(Context<E> &ctx) { - std::tuple(((SharedFile<E> *)b->file)->soname, b->ver_idx); - }); - -- // Resize of .gnu.version -+ // Resize .gnu.version - ctx.versym->contents.resize(ctx.dynsym->symbols.size(), 1); - ctx.versym->contents[0] = 0; - - // Allocate a large enough buffer for .gnu.version_r. -- contents.resize((sizeof(ElfVerneed<E>) + sizeof(ElfVernaux<E>)) * syms.size()); -+ contents.resize((sizeof(ElfVerneed<E>) + sizeof(ElfVernaux<E>)) * -+ (syms.size() + 1)); - - // Fill .gnu.version_r. - u8 *buf = (u8 *)&contents[0]; -@@ -2394,14 +2395,14 @@ void VerneedSection<E>::construct(Context<E> &ctx) { - verneed->vn_next = ptr - (u8 *)verneed; - - verneed = (ElfVerneed<E> *)ptr; -- ptr += sizeof(*verneed); -+ ptr += sizeof(ElfVerneed<E>); - verneed->vn_version = 1; - verneed->vn_file = ctx.dynstr->find_string(((SharedFile<E> *)file)->soname); - verneed->vn_aux = sizeof(ElfVerneed<E>); - aux = nullptr; - }; - -- auto add_entry = [&](Symbol<E> *sym) { -+ auto add_entry = [&](std::string_view verstr) { - verneed->vn_cnt++; - - if (aux) -@@ -2409,23 +2410,52 @@ void VerneedSection<E>::construct(Context<E> &ctx) { - aux = (ElfVernaux<E> *)ptr; - ptr += sizeof(*aux); - -- std::string_view verstr = sym->get_version(); - aux->vna_hash = elf_hash(verstr); - aux->vna_other = ++veridx; - aux->vna_name = ctx.dynstr->add_string(verstr); - }; - -+ // Create version entries. - for (i64 i = 0; i < syms.size(); i++) { - if (i == 0 || syms[i - 1]->file != syms[i]->file) { - start_group(syms[i]->file); -- add_entry(syms[i]); -+ add_entry(syms[i]->get_version()); - } else if (syms[i - 1]->ver_idx != syms[i]->ver_idx) { -- add_entry(syms[i]); -+ add_entry(syms[i]->get_version()); - } - - ctx.versym->contents[syms[i]->get_dynsym_idx(ctx)] = veridx; - } - -+ if (ctx.arg.z_pack_relative_relocs) { -+ // If `-z pack-relative-relocs` is specified, we'll create a .relr.dyn -+ // section and store base relocation records to that section instead of -+ // to the usual .rela.dyn section. -+ // -+ // .relr.dyn is relatively new feature and not supported by glibc until -+ // 2.38 which was released in 2022. Executables built with `-z -+ // pack-relative-relocs` don't work and usually crash immediately on -+ // startup if libc doesn't support it. -+ // -+ // In the following code, we'll add a dependency to a dummy version name -+ // "GLIBC_ABI_DT_RELR" so that executables built with the option failed -+ // with a more friendly "version `GLIBC_ABI_DT_RELR' not found" error -+ // message. glibc 2.38 or later knows about this dummy version name and -+ // simply ignores it. -+ auto find_glibc2 = [&]() -> InputFile<E> * { -+ for (Symbol<E> *sym : syms) -+ if (((SharedFile<E> *)sym->file)->soname.starts_with("libc.so.") && -+ sym->get_version().starts_with("GLIBC_2.")) -+ return sym->file; -+ return nullptr; -+ }; -+ -+ if (InputFile<E> *file = find_glibc2()) { -+ start_group(file); -+ add_entry("GLIBC_ABI_DT_RELR"); -+ } -+ } -+ - // Resize .gnu.version_r to fit to its contents. - contents.resize(ptr - buf); - } -diff --git a/test/elf/z-pack-relative-relocs.sh b/test/elf/z-pack-relative-relocs.sh -new file mode 100755 -index 000000000..e09d441e7 ---- /dev/null -+++ b/test/elf/z-pack-relative-relocs.sh -@@ -0,0 +1,16 @@ -+#!/bin/bash -+. $(dirname $0)/common.inc -+ -+cat <<EOF | $CC -o $t/a.o -fPIC -c -xc - -+#include <stdio.h> -+int main() { -+ printf("Hello world\n"); -+} -+EOF -+ -+$CC -B. -o $t/exe $t/a.o -pie -Wl,-z,pack-relative-relocs -+ -+readelf -W -V $t/exe > $t/log -+grep -Fq GLIBC_2. $t/log || skip -+ -+grep -q GLIBC_ABI_DT_RELR $t/log |