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When generating ELF objects from assembly, gcc and clang mark the GNU_STACK program headers as RWX by default. This is a security issue, so we make sure it is marked only RW. This modifies Anthony G. Basile's original patch for Linux to set .note.GNU-stack whenever the assembler supports it. It is surprising that any modern toolchain would enable an executable stack without an explicit request. The number of programs that need an executable stack is surely much smaller than the number of programs that include assembly.
This package is the official portable version of LibreSSL
(http://www.libressl.org).
LibreSSL is a fork of OpenSSL developed by the OpenBSD project
(http://www.openbsd.org). LibreSSL is developed on OpenBSD. This
package then adds portability shims for other operating systems.
Official release tarballs are available at your friendly neighborhood
OpenBSD mirror in directory LibreSSL, e.g.:
http://ftp.openbsd.org/pub/OpenBSD/LibreSSL/
although we suggest that you use a mirror:
http://www.openbsd.org/ftp.html
The LibreSSL portable build framework is also mirrored in Github:
https://github.com/libressl-portable/portable
If you have checked this source using Git, follow these initial steps to
prepare the source tree for building:
1. ensure you have the following packages installed:
automake, autoconf, bash, git, libtool, perl, pod2man
2. run './autogen.sh' to prepare the source tree for building
or run './dist.sh' to prepare a tarball.
Once you have a source tree from Git or FTP, run these commands to build and
install the package:
./configure # see ./configure --help for configuration options
make check # runs builtin unit tests
make install # set DESTDIR= to install to an alternate location
The resulting library and 'openssl' utility is largely API-compatible with
OpenSSL 1.0.1. However, it is not ABI compatible - you will need to relink your
programs to LibreSSL in order to use it, just as in moving from OpenSSL 0.9.8
to 1.0.1.
The project attempts to provide working alternatives for operating systems with
limited or broken security primitives (e.g. arc4random(3), issetugid(2)) and
assists with improving OS-native implementations where possible.
LibreSSL portable will build on any reasonably modern version of Linux,
Solaris, or OSX with a standards-compliant compiler and C library.