CVS Repository/ src/ gnu/ usr.bin/ binutils/ bfd/ elf.c

In the linkers, collect objects in section "openbsd.mutable" and place
them into a page-aligned region in the bss, with the right markers for
kernel/ld.so to identify the region and skip making it immutable.
While here, fix readelf/objdump versions to show all of this.
ok miod kettenis

Generate a PT_PHDR entry for static PIE binaries.  Modern GDB needs this to
do some sanity checking while it determines the load base.

ok kurt@

Add support for .openbsd.randomdata sections and PT_OPENBSD_RANDOMIZE
segments to the kernel, ld (2.15), and ld.so.  Tested on alpha, amd64,
i386, macppc, and sparc64 (thanks naddy, mpi, and okan!).

Idea discussed for some time; committing now for further testing.
ok deraadt

Don't munge PID and TID together, since the way GDB displays them isn't very
helpful.  Just provide the TID instead.

Properly recognize threads in OpenBSD core dumps.

Teach bfd and gdb about the upcoming ELF core dumps.

Merge conflicts, bringing our changes back in:
- extra $(SHELL) and sugar for make (so that files not mode +x still work)
- safer temp file handling
- our W^X binary layout changes in ld
- OpenBSD policy for library file selection in ld
- arm and m88k changes which were not merged in time for official 2.15
- bfd core file handling
- a couple typos

New for 2.15:
- ld(1) and as(1) manpages now generated at build time
- binutils/stabs.c reverted to use our in-tree libiberty for now
- we still use our VIA C3 crypto code over stock binutils, as it recognizes
  more instructions
- new emulations for OpenBSD on mips64 machines, to help OpenBSD/sgi
- relaxed %f# handling in gas on OpenBSD/sparc64 (same as was in 2.14)

Tested on all platforms by various people; special thanks to sturm@ and
otto@.

Resolve merge conflicts, adjust method of W^X handing (.sh files)
remove testsuites (not useable) remove mmalloc (not part of new binutils).

Again this comment was not updated. now we have 7 load sections.

ELF security enhancement: put .rodata into it's own load section instead
of putting it with the text. This removes the execute permission
from readonly data. This constrains the executable region to portions
of the executable which need to be executable. Note: not all processors
or mmus are capable of -X protection at the page level, but should
handle ELF images which specify specific RWX protections on each section.

Update comment for linker change which just committed.

This is a project to modify executables so that they do not have any
executable regions which are writable. If a section of an executable is
writable and executable, it is much easier for errant code to modify the
executable's behavior.

Two current areas in shared library environments which have this
critical problem are the GOT (Global Offset Table) and PLT (Procedure
Linkage Table). The PLT is required to be executable and both GOT and
PLT are writable on most architectures. On most ELF architecture
machines this would cause shared libraries to have data and BSS marked
as executable.

Padding to the linker script for programs and shared libraries/objects
to isolate the GOT and PLT into their own load sections in the
executables. This allows only the text(readonly) region and the PLT
region to be marked executable with the normal data and BSS not marked
as executable. The PLT region is still marked executable on most
architectures because the PLT lives in the "data" or "BSS" regions
and the dynamic loader will need to modify it. Since the GOT and PLT
should only ever be written by the dynamic linker, it will be modified
to mprotect those regions so that they are not writable during normal
execution. If the dynamic linker needs to modify the regions later,
(eg for lazy binding), it will mprotect the region, make the necessary
changes, and mprotect it back. Since it is possible to receive a
signal which would interrupt the program flow and perhaps cause the
dynamic linker to modify the same (or nearby) PLT references, it is now
necessary for signals to be blocked for the duration of the mprotect.

resolve conflicts.

Leave space for terminating NULL if empty symbol table. from bfd-current
via pr 2447; deraadt@ ok.

Automatic cvs merge. Dread what I will have to fix after this excuse
of a program is done...

Help stupid cvs fixing basic conflicts.

Merge to Cygnus 961112 + add some support (not ready) for shared libs

Need a real fix. Remove workaround...

workaround for header bug

Seems they fixed that old bug. Remove workaround

Merge the Cygnus 960904 sources

Fixes to make MIPS arc port to use in tree binutils.

Bring Cygnus versions into the trunk, keeping our local patches

Initial revision

Binutils 2.15, with testsuites removed, and without gdb and libiberty.

import binutils 2.14 (excluding testsuites, .info files, and .po files)

Import binutils-2.11.2
- only the binutils package (no gdb here)
- don't import libiberty and texinfo, they are elsewhere
- remove all .info* generated files

Long delayed import of binutils-2.10.1. Turns out art@ needs some alpha
bug-fixes...

Import binutils-2.10
- only the binutils package (no gdb here)
- don't import libiberty and texinfo, they are elsewhere
- remove all .info* generated files

Import of binutils-2.8.1 from Cygnus/FSF

Import of 961112 Cygnus binutils+gas+ld+gdb+gprof

Import of binutils, gas, ld & gprof from Cygnus 960904 tree

(Correct) Import of Cygnus binutils snapshot taken 960607

Initial GNU binutils 2.6 import