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llvm-project/lld
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Fangrui Song 2672051495 [ELF] Error if the linked-to section of a SHF_LINK_ORDER section is discarded 
Summary:
If st_link(A)=B, and A has the SHF_LINK_ORDER flag, we may dereference
a null pointer if B is garbage collected (PR43147):

1. In Wrter.cpp:compareByFilePosition, `aOut->sectionIndex` or `bOut->sectionIndex`
2. In OutputSections::finalize, `d->getParent()->sectionIndex`

Simply error and bail out to avoid null pointer dereferences. ld.bfd has
a similar error:

    sh_link of section `.bar' points to discarded section `.foo0' of `a.o'

ld.bfd is more permissive in that it just checks whether the linked-to
section of the first input section is discarded. This is likely because
it sets sh_link of the output section according to the first input
section.

Reviewed By: grimar

Differential Revision: https://reviews.llvm.org/D67761

llvm-svn: 372400
 		2019-09-20 15:03:21 +00:00
..
COFF [lld] Update lld driver to use new LTO APIs to handle libcall symbols 2019-09-16 18:49:57 +00:00
Common [ELF] For VS-style diagnostics, prefer printing full paths in the header. 2019-08-09 08:29:03 +00:00
ELF [ELF] Error if the linked-to section of a SHF_LINK_ORDER section is discarded 2019-09-20 15:03:21 +00:00
MinGW [MinGW] Correct handling different forms of a few options 2019-08-14 09:35:44 +00:00
cmake/modules [CMake] Properly conditionalize installation of lld libraries 2018-03-09 13:09:36 +00:00
docs lld-link: Add a flag /lldignoreenv that makes lld-link ignore env vars. 2019-09-13 13:13:52 +00:00
include/lld [LLD] Migrate llvm::make_unique to std::make_unique 2019-08-14 22:28:17 +00:00
lib [mach-o] Extend LC_DATA_IN_CODE support to x86_64 2019-08-28 10:11:50 +00:00
test [ELF] Error if the linked-to section of a SHF_LINK_ORDER section is discarded 2019-09-20 15:03:21 +00:00
tools/lld Fix build breakage on Darwin. 2019-07-11 06:12:18 +00:00
unittests Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
utils Python 2/3 compatibility 2019-03-20 07:42:13 +00:00
wasm [WebAssembly][NFC] Remove unnecessary braces 2019-09-19 21:51:52 +00:00
.arcconfig
…
.clang-format
…
.gitignore
…
CMakeLists.txt [CMake] Don't set Python_ADDITIONAL_VERSIONS 2019-07-18 15:17:42 +00:00
CODE_OWNERS.TXT
…
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
README.md
…

README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.

Benchmarking

In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.

It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz

The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.