Binutils with MCST patches
Go to file
Tom de Vries 31aceee863 [gdb] Fix gdb crash when reading core file
Consider the test-case from this patch, compiled with O0.

The executable segfaults, and generates a core dump:
...
$ ./a.out
Segmentation fault (core dumped)
...

When loading the core file, limiting stack size to 4MB, gdb crashes:
...
$ ulimit -s 4096
$ gdb -batch ./a.out core.saved
[New LWP 19379]
Segmentation fault (core dumped)
...

The crash originates here in linux_vsyscall_range_raw, where we call alloca
with phdrs_size == 4194112 (roughly 4MB):
...
      phdrs = (Elf_Internal_Phdr *) alloca (phdrs_size);
...

While for this test-case gdb runs fine with the system default stack limit of
8MB, there are cases reported of 12MB phdrs_size where gdb also crashes with
the system default stack limit.

Fix this by using xmalloc instead of alloca, which prevents the crash provided
the stack limit is at least 112kb.

Build and reg-tested on x86_64-linux.

2018-11-06  Tom de Vries  <tdevries@suse.de>

	* linux-tdep.c (linux_vsyscall_range_raw): Use xmalloc to allocate
	program headers.

	* gdb.base/many-headers.c: New test.
	* gdb.base/many-headers.exp: New file.
2018-11-06 23:15:41 +01:00
bfd Add support for a couple of new Mach-O commands. 2018-11-06 17:17:43 +00:00
binutils elfedit: Add --enable-x86-feature/--disable-x86-feature 2018-11-06 09:38:51 -08:00
config Merge config/ changes from GCC. 2018-10-31 17:16:41 +00:00
contrib Update dg-extract-results.* from gcc 2018-08-06 16:05:16 +02:00
cpu or1k: Add the l.muld, l.muldu, l.macu, l.msbu insns 2018-10-05 11:41:42 +09:00
elfcpp [MIPS] Add Loongson 2K1000 proccessor support. 2018-08-29 20:55:25 +08:00
etc Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
gas [arm] fix testsuite breakage on pe-coff 2018-11-06 17:09:34 +00:00
gdb [gdb] Fix gdb crash when reading core file 2018-11-06 23:15:41 +01:00
gold [GOLD] make clean 2018-11-02 14:00:15 +10:30
gprof Fix typo setting user_specified variable when parsing -Z option. 2018-10-01 17:18:20 +01:00
include Add support for a couple of new Mach-O commands. 2018-11-06 17:17:43 +00:00
intl Backport gettext fixes to get rid of warnings on macOS 2018-08-02 14:56:02 -04:00
ld elfedit: Add --enable-x86-feature/--disable-x86-feature 2018-11-06 09:38:51 -08:00
libdecnumber Merge config/ changes from GCC. 2018-10-31 17:16:41 +00:00
libiberty Copy from GCC: Add linker_output as prefix for LTO temps (PR lto/86548). 2018-08-01 14:23:10 +01:00
opcodes [BINUTILS, ARM] Add Armv8.5-A to select_arm_features and update macros. 2018-11-06 12:13:45 +00:00
readline Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
sim [src/erc32] Use ncurses instead of termcap on Cygwin too 2018-10-30 16:41:12 +00:00
texinfo
zlib Merge config/ changes from GCC. 2018-10-31 17:16:41 +00:00
.cvsignore
.gitattributes
.gitignore Add archives and make stamps to the .gitignore file. 2016-09-27 15:10:42 +01:00
ar-lib Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ChangeLog Merge autoconf / automake update changes from GCC. 2018-10-31 17:10:56 +00:00
compile
config-ml.in Update top level configure files by synchronizing them with gcc. 2018-01-10 15:29:21 +00:00
config.guess Update config.guess and config.sub 2018-07-05 13:35:19 +02:00
config.rpath
config.sub Update config.sub 2018-07-06 08:23:40 +02:00
configure Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-29 23:49:28 -03:00
configure.ac Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-29 23:49:28 -03:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS Update the address of the FSF in the copyright notice of files which were using the old address. 2017-12-14 12:48:55 +00:00
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh Update from upstream Automake 2014-11-16 13:43:48 +01:00
libtool.m4 Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def This was already applied on the GCC side. 2018-06-19 00:05:40 +02:00
Makefile.in Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-29 23:49:28 -03:00
Makefile.tpl Introduce @unless/@endunless and postbootstrap Makefile targets 2018-06-29 23:49:28 -03:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am Merge autoconf / automake update changes from GCC. 2018-10-31 17:10:56 +00:00
README
README-maintainer-mode Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
setup.com
src-release.sh Add "contrib" to the list of GDB support dirs (on src-release.sh) 2018-09-13 12:33:19 -04:00
symlink-tree
test-driver Bump to autoconf 2.69 and automake 1.15.1 2018-06-19 16:55:06 -04:00
ylwrap

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.