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When Emacs is compiled with AddressSanitizer support, enable poisoning/unpoisoning freed/unused Lisp objects and other internal memory management structures. If enabled, this will mark freed bytes that have been put on free lists for future use and initially allocated memory blocks/chunks as "poisoned", triggering an ASan error if they are accessed improperly. Structures are unpoisoned when they have been taken off their respective free lists. Additionally, add optional macros for performing unaligned loads, which when enabled by defining USE_SANITIZER_UNALIGNED_LOAD will use ASan provided functions for loading from unaligned addresses, which may help catch bugs that AddressSanitizer might otherwise miss. * configure.ac: Check for the existence of address and common sanitizer API headers. * src/lisp.h (UNALIGNED_LOAD_SIZE): New macro. If enabled, and the necessary sanitizer API is available, define it to __sanitizer_unaligned_load(64|32) depending on the word size of the architecture. * src/fns.c [HAVE_FAST_UNALIGNED_ACCESS] (Fstring_lessp): Use 'UNALIGNED_LOAD_SIZE' to perform unaligned loads from the two strings. * src/alloc.c (ASAN_POISON_ABLOCK, ASAN_UNPOISON_ABLOCK) (ASAN_POISON_INTERVAL_BLOCK, ASAN_UNPOISON_INTERVAL_BLOCK) (ASAN_POISON_INTERVAL, ASAN_UNPOISON_INTERVAL) (ASAN_PREPARE_DEAD_SDATA, ASAN_PREPARE_LIVE_SDATA) (ASAN_POISON_SBLOCK_DATA, ASAN_POISON_STRING_BLOCK) (ASAN_UNPOISON_STRING_BLOCK, ASAN_POISON_STRING) (ASAN_UNPOISON_STRING, ASAN_POISON_FLOAT_BLOCK) (ASAN_UNPOISON_FLOAT_BLOCK, ASAN_POISON_FLOAT) (ASAN_UNPOISON_FLOAT, ASAN_POISON_CONS_BLOCK) (ASAN_POISON_CONS, ASAN_UNPOISON_CONS) (ASAN_POISON_VECTOR_CONTENTS, ASAN_UNPOISON_VECTOR_CONTENTS) (ASAN_UNPOISON_VECTOR_BLOCK, ASAN_POISON_SYMBOL_BLOCK) (ASAN_UNPOISON_SYMBOL_BLOCK, ASAN_POISON_SYMBOL) (ASAN_UNPOISON_SYMBOL) [ADDRESS_SANITIZER]: New macros. When address sanitization is enabled, define them to poison/unpoison objects. (lisp_align_malloc): Poison newly allocated blocks on `free_ablock', unpoison ablocks taken from it respectively. (lisp_align_free): Poison individual ablocks when they are put on the free list, unpoison them when an entire `ablocks' chunk is being freed. (make_interval): Poison interval blocks on initial allocation, unpoison individual intervals on allocation and removal from `interval_free_list'. (sweep_intervals): Unpoison interval blocks before sweeping, poison dead/unmarked intervals. (allocate_string): Poison string blocks on initial allocation, unpoison Lisp_Strings on removal from the free list. (allocate_string_data): Poison `sblock' data on initial allocation, unpoison individual `sdata' contents on allocation or removal from the free list. Call `ASAN_PREPARE_LIVE_SDATA' on the new `sdata' struct. (sweep_strings): Unpoison string blocks before sweeping them, poisoning dead strings and their sdata afterwards. (compact_small_strings): Call `ASAN_PREPARE_LIVE_DATA' on the `sdata' to where compacted strings to moved to. (pin_string): Call `ASAN_PREPARE_DEAD_SDATA' on `old_sdata'. (make_float): Poison float blocks on allocation, unpoisoning individual Lisp_Floats on allocation or removal from `float_free_list'. (sweep_floats): Unpoison float blocks before sweeping, poison dead/unmarked floats. (free_cons): Poison `ptr'. (Fcons): Poison cons blocks on allocation, unpoisoning individual Lisp_Cons on allocation or removal from `cons_free_list'. (sweep_conses): Poison dead/unmarked conses. (setup_free_list): Poison vectors put on `vector_free_lists'. (allocate_vector_from_block): Unpoison vectors taken from the free list, poison excess vector bytes when vectors allocated from the free list are larger than requested. (sweep_vectors): Unpoison vector blocks before sweeping them. (Fmake_symbol): Poison symbol blocks on initial allocation, unpoisoning individual Lisp_Symbols on allocation or removal from `symbol_free_list'. (sweep_symbols): Unpoison symbol blocks before sweeping, poisoning dead/unmarked symbols. (live_string_holding, live_cons_holding, live_symbol_holding) (live_float_holding): When compiling with address sanitization and GC poisoning enabled, return NULL if the passed address is poisoned, or if the Lisp object it resides in is poisoned, avoiding a use-after-poison trigger if these functions are called on a pointer that might be referring to a now dead/swept object. * etc/DEBUG: Add information about enabling ASan memory poisoning. |
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| admin | ||
| build-aux | ||
| doc | ||
| etc | ||
| leim | ||
| lib | ||
| lib-src | ||
| lisp | ||
| lwlib | ||
| m4 | ||
| modules | ||
| msdos | ||
| nextstep | ||
| nt | ||
| oldXMenu | ||
| src | ||
| test | ||
| .clang-format | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .mailmap | ||
| autogen.sh | ||
| BUGS | ||
| ChangeLog.1 | ||
| ChangeLog.2 | ||
| ChangeLog.3 | ||
| config.bat | ||
| configure.ac | ||
| CONTRIBUTE | ||
| COPYING | ||
| GNUmakefile | ||
| INSTALL | ||
| INSTALL.REPO | ||
| make-dist | ||
| Makefile.in | ||
| README | ||
Copyright (C) 2001-2022 Free Software Foundation, Inc.
See the end of the file for license conditions.
This directory tree holds version 30.0.50 of GNU Emacs, the extensible,
customizable, self-documenting real-time display editor.
The file INSTALL in this directory says how to build and install GNU
Emacs on various systems, once you have unpacked or checked out the
entire Emacs file tree.
See the file etc/NEWS for information on new features and other
user-visible changes in recent versions of Emacs.
The file etc/PROBLEMS contains information on many common problems that
occur in building, installing and running Emacs.
The file CONTRIBUTE contains information on contributing to Emacs as a
developer.
You may encounter bugs in this release. If you do, please report
them; your bug reports are valuable contributions to the FSF, since
they allow us to notice and fix problems on machines we don't have, or
in code we don't use often. Please send bug reports to the mailing
list bug-gnu-emacs@gnu.org. If possible, use M-x report-emacs-bug.
See the "Bugs" section of the Emacs manual for more information on how
to report bugs. (The file 'BUGS' in this directory explains how you
can find and read that section using the Info files that come with
Emacs.) For a list of mailing lists related to Emacs, see
<https://savannah.gnu.org/mail/?group=emacs>. For the complete
list of GNU mailing lists, see <https://lists.gnu.org/>.
The 'etc' subdirectory contains several other files, named in capital
letters, which you might consider looking at when installing GNU
Emacs.
The file 'configure' is a shell script to acclimate Emacs to the
oddities of your processor and operating system. It creates the file
'Makefile' (a script for the 'make' program), which automates the
process of building and installing Emacs. See INSTALL for more
detailed information.
The file 'configure.ac' is the input used by the autoconf program to
construct the 'configure' script.
The shell script 'autogen.sh' generates 'configure' and other files by
running Autoconf (which in turn uses GNU m4), and configures files in
the .git subdirectory if you are using Git. If you want to use it,
you will need to install recent versions of these build tools. This
should be needed only if you edit files like 'configure.ac' that
specify Emacs's autobuild procedure.
The file 'Makefile.in' is a template used by 'configure' to create
'Makefile'.
The file 'make-dist' is a shell script to build a distribution tar
file from the current Emacs tree, containing only those files
appropriate for distribution. If you make extensive changes to Emacs,
this script will help you distribute your version to others.
There are several subdirectories:
'src' holds the C code for Emacs (the Emacs Lisp interpreter and
its primitives, the redisplay code, and some basic editing
functions).
'lisp' holds the Emacs Lisp code for Emacs (most everything else).
'leim' holds the original source files for the generated files
in lisp/leim. These form the library of Emacs input methods,
required to type international characters that can't be
directly produced by your keyboard.
'lib' holds source code for libraries used by Emacs and its utilities
'lib-src' holds the source code for some utility programs for use by or
with Emacs, like movemail and etags.
'lwlib' holds the sources of the Lucid Widget Library used on X.
'oldXMenu' source files from X11R2 XMenu library, used in non-toolkit builds.
'etc' holds miscellaneous architecture-independent data files Emacs
uses, like the tutorial text and tool bar images.
The contents of the 'lisp', 'leim', 'info', and 'doc'
subdirectories are architecture-independent too.
'info' holds the Info documentation tree for Emacs.
'doc/emacs' holds the source code for the Emacs Manual. If you modify the
manual sources, you will need the 'makeinfo' program to produce
an updated manual. 'makeinfo' is part of the GNU Texinfo
package; you need a suitably recent version of Texinfo.
'doc/lispref' holds the source code for the Emacs Lisp reference manual.
'doc/lispintro' holds the source code for the Introduction to Programming
in Emacs Lisp manual.
'msdos' holds configuration files for compiling Emacs under MS-DOS.
'nextstep' holds instructions and some other files for compiling the
Nextstep port of Emacs, for GNUstep and macOS Cocoa.
'nt' holds code and documentation for building Emacs on MS-Windows.
'test' holds tests for various aspects of Emacs's functionality.
'modules' holds the modhelp.py helper script.
'admin' holds files used by Emacs developers, and Unicode data files.
'build-aux' holds auxiliary files used during the build.
'm4' holds Autoconf macros used for generating the configure script.
Building Emacs on non-Posix platforms requires tools that aren't part
of the standard distribution of the OS. The platform-specific README
files and installation instructions should list the required tools.
NOTE ON COPYRIGHT YEARS
In copyright notices where the copyright holder is the Free Software
Foundation, then where a range of years appears, this is an inclusive
range that applies to every year in the range. For example: 2005-2008
represents the years 2005, 2006, 2007, and 2008.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.