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5474d94f03
Variables defined in shared libraries are copied into an executable's .bss section when code in the executable is non-PIC and thus would require dynamic text relocations to access the variable directly in the shared library. Recent x86 toolchains also copy variables into the executable to gain a small speed improvement. The problem is that if the variable was originally read-only, the copy in .bss is writable, potentially opening a security hole. This patch cures that problem by putting the copy in a section that becomes read-only after ld.so relocation, provided -z relro is in force. The patch also fixes a microblaze linker segfault on attempting to use dynamic bss variables. bfd/ PR ld/20995 * elf-bfd.h (struct elf_link_hash_table): Add sdynrelro and sreldynrelro. (struct elf_backend_data): Add want_dynrelro. * elfxx-target.h (elf_backend_want_dynrelro): Define. (elfNN_bed): Update initializer. * elflink.c (_bfd_elf_create_dynamic_sections): Create sdynrelro and sreldynrelro sections. * elf32-arm.c (elf32_arm_adjust_dynamic_symbol): Place variables copied into the executable from read-only sections into sdynrelro. (elf32_arm_size_dynamic_sections): Handle sdynrelro. (elf32_arm_finish_dynamic_symbol): Select sreldynrelro for dynamic relocs in sdynrelro. (elf_backend_want_dynrelro): Define. * elf32-hppa.c (elf32_hppa_adjust_dynamic_symbol) (elf32_hppa_size_dynamic_sections, elf32_hppa_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-i386.c (elf_i386_adjust_dynamic_symbol) (elf_i386_size_dynamic_sections, elf_i386_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-metag.c (elf_metag_adjust_dynamic_symbol) (elf_metag_size_dynamic_sections, elf_metag_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-microblaze.c (microblaze_elf_adjust_dynamic_symbol) (microblaze_elf_size_dynamic_sections) (microblaze_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-nios2.c (nios2_elf32_finish_dynamic_symbol) (nios2_elf32_adjust_dynamic_symbol) (nios2_elf32_size_dynamic_sections) (elf_backend_want_dynrelro): As above. * elf32-or1k.c (or1k_elf_finish_dynamic_symbol) (or1k_elf_adjust_dynamic_symbol, or1k_elf_size_dynamic_sections) (elf_backend_want_dynrelro): As above. * elf32-ppc.c (ppc_elf_adjust_dynamic_symbol) (ppc_elf_size_dynamic_sections, ppc_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-s390.c (elf_s390_adjust_dynamic_symbol) (elf_s390_size_dynamic_sections, elf_s390_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-tic6x.c (elf32_tic6x_adjust_dynamic_symbol) (elf32_tic6x_size_dynamic_sections) (elf32_tic6x_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf32-tilepro.c (tilepro_elf_adjust_dynamic_symbol) (tilepro_elf_size_dynamic_sections) (tilepro_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol) (ppc64_elf_size_dynamic_sections, ppc64_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf64-s390.c (elf_s390_adjust_dynamic_symbol) (elf_s390_size_dynamic_sections, elf_s390_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elf64-x86-64.c (elf_x86_64_adjust_dynamic_symbol) (elf_x86_64_size_dynamic_sections) (elf_x86_64_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elfnn-aarch64.c (elfNN_aarch64_adjust_dynamic_symbol) (elfNN_aarch64_size_dynamic_sections) (elfNN_aarch64_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elfnn-riscv.c (riscv_elf_adjust_dynamic_symbol) (riscv_elf_size_dynamic_sections, riscv_elf_finish_dynamic_symbol) (elf_backend_want_dynrelro): As above. * elfxx-mips.c (_bfd_mips_elf_adjust_dynamic_symbol) (_bfd_mips_elf_size_dynamic_sections) (_bfd_mips_vxworks_finish_dynamic_symbol): As above. * elfxx-sparc.c (_bfd_sparc_elf_adjust_dynamic_symbol) (_bfd_sparc_elf_size_dynamic_sections) (_bfd_sparc_elf_finish_dynamic_symbol): As above. * elfxx-tilegx.c (tilegx_elf_adjust_dynamic_symbol) (tilegx_elf_size_dynamic_sections) (tilegx_elf_finish_dynamic_symbol): As above. * elf32-mips.c (elf_backend_want_dynrelro): Define. * elf64-mips.c (elf_backend_want_dynrelro): Define. * elf32-sparc.c (elf_backend_want_dynrelro): Define. * elf64-sparc.c (elf_backend_want_dynrelro): Define. * elf32-tilegx.c (elf_backend_want_dynrelro): Define. * elf64-tilegx.c (elf_backend_want_dynrelro): Define. * elf32-microblaze.c (microblaze_elf_adjust_dynamic_symbol): Tidy. (microblaze_elf_size_dynamic_sections): Handle sdynbss. * elf32-nios2.c (nios2_elf32_size_dynamic_sections): Make use of linker shortcuts to dynamic sections rather than comparing names. Correctly set "got" flag. ld/ PR ld/20995 * testsuite/ld-arm/farcall-mixed-app-v5.d: Update to suit changed stub hash table traversal caused by section id increment. Accept the previous output too. * testsuite/ld-arm/farcall-mixed-app.d: Likewise. * testsuite/ld-arm/farcall-mixed-lib-v4t.d: Likewise. * testsuite/ld-arm/farcall-mixed-lib.d: Likewise. * testsuite/ld-elf/pr20995a.s, * testsuite/ld-elf/pr20995b.s, * testsuite/ld-elf/pr20995.r: New test. * testsuite/ld-elf/elf.exp: Run it. |
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| .. | ||
| doc | ||
| hosts | ||
| po | ||
| .gitignore | ||
| acinclude.m4 | ||
| aclocal.m4 | ||
| aix5ppc-core.c | ||
| aix386-core.c | ||
| aout0.c | ||
| aout32.c | ||
| aout64.c | ||
| aout-adobe.c | ||
| aout-arm.c | ||
| aout-cris.c | ||
| aout-ns32k.c | ||
| aout-sparcle.c | ||
| aout-target.h | ||
| aout-tic30.c | ||
| aoutf1.h | ||
| aoutx.h | ||
| arc-got.h | ||
| arc-plt.def | ||
| arc-plt.h | ||
| archive64.c | ||
| archive.c | ||
| archures.c | ||
| armnetbsd.c | ||
| bfd-in2.h | ||
| bfd-in.h | ||
| bfd.c | ||
| bfd.m4 | ||
| bfdio.c | ||
| bfdwin.c | ||
| binary.c | ||
| bout.c | ||
| cache.c | ||
| cf-i386lynx.c | ||
| cf-sparclynx.c | ||
| ChangeLog | ||
| ChangeLog-0001 | ||
| ChangeLog-0203 | ||
| ChangeLog-2004 | ||
| ChangeLog-2005 | ||
| ChangeLog-2006 | ||
| ChangeLog-2007 | ||
| ChangeLog-2008 | ||
| ChangeLog-2009 | ||
| ChangeLog-2010 | ||
| ChangeLog-2011 | ||
| ChangeLog-2012 | ||
| ChangeLog-2013 | ||
| ChangeLog-2014 | ||
| ChangeLog-2015 | ||
| ChangeLog-9193 | ||
| ChangeLog-9495 | ||
| ChangeLog-9697 | ||
| ChangeLog-9899 | ||
| cisco-core.c | ||
| coff64-rs6000.c | ||
| coff-alpha.c | ||
| coff-apollo.c | ||
| coff-arm.c | ||
| coff-aux.c | ||
| coff-bfd.c | ||
| coff-bfd.h | ||
| coff-go32.c | ||
| coff-h8300.c | ||
| coff-h8500.c | ||
| coff-i386.c | ||
| coff-i860.c | ||
| coff-i960.c | ||
| coff-ia64.c | ||
| coff-m68k.c | ||
| coff-m88k.c | ||
| coff-mcore.c | ||
| coff-mips.c | ||
| coff-ppc.c | ||
| coff-rs6000.c | ||
| coff-sh.c | ||
| coff-sparc.c | ||
| coff-stgo32.c | ||
| coff-svm68k.c | ||
| coff-tic4x.c | ||
| coff-tic30.c | ||
| coff-tic54x.c | ||
| coff-tic80.c | ||
| coff-u68k.c | ||
| coff-w65.c | ||
| coff-we32k.c | ||
| coff-x86_64.c | ||
| coff-z8k.c | ||
| coff-z80.c | ||
| coffcode.h | ||
| coffgen.c | ||
| cofflink.c | ||
| coffswap.h | ||
| compress.c | ||
| config.bfd | ||
| config.in | ||
| configure | ||
| configure.ac | ||
| configure.com | ||
| configure.host | ||
| COPYING | ||
| corefile.c | ||
| cpu-aarch64.c | ||
| cpu-alpha.c | ||
| cpu-arc.c | ||
| cpu-arm.c | ||
| cpu-avr.c | ||
| cpu-bfin.c | ||
| cpu-cr16.c | ||
| cpu-cr16c.c | ||
| cpu-cris.c | ||
| cpu-crx.c | ||
| cpu-d10v.c | ||
| cpu-d30v.c | ||
| cpu-dlx.c | ||
| cpu-epiphany.c | ||
| cpu-fr30.c | ||
| cpu-frv.c | ||
| cpu-ft32.c | ||
| cpu-h8300.c | ||
| cpu-h8500.c | ||
| cpu-hppa.c | ||
| cpu-i370.c | ||
| cpu-i386.c | ||
| cpu-i860.c | ||
| cpu-i960.c | ||
| cpu-ia64-opc.c | ||
| cpu-ia64.c | ||
| cpu-iamcu.c | ||
| cpu-ip2k.c | ||
| cpu-iq2000.c | ||
| cpu-k1om.c | ||
| cpu-l1om.c | ||
| cpu-lm32.c | ||
| cpu-m9s12x.c | ||
| cpu-m9s12xg.c | ||
| cpu-m32c.c | ||
| cpu-m32r.c | ||
| cpu-m68hc11.c | ||
| cpu-m68hc12.c | ||
| cpu-m68k.c | ||
| cpu-m88k.c | ||
| cpu-m10200.c | ||
| cpu-m10300.c | ||
| cpu-mcore.c | ||
| cpu-mep.c | ||
| cpu-metag.c | ||
| cpu-microblaze.c | ||
| cpu-mips.c | ||
| cpu-mmix.c | ||
| cpu-moxie.c | ||
| cpu-msp430.c | ||
| cpu-mt.c | ||
| cpu-nds32.c | ||
| cpu-nios2.c | ||
| cpu-ns32k.c | ||
| cpu-or1k.c | ||
| cpu-pdp11.c | ||
| cpu-pj.c | ||
| cpu-plugin.c | ||
| cpu-powerpc.c | ||
| cpu-riscv.c | ||
| cpu-rl78.c | ||
| cpu-rs6000.c | ||
| cpu-rx.c | ||
| cpu-s390.c | ||
| cpu-score.c | ||
| cpu-sh.c | ||
| cpu-sparc.c | ||
| cpu-spu.c | ||
| cpu-tic4x.c | ||
| cpu-tic6x.c | ||
| cpu-tic30.c | ||
| cpu-tic54x.c | ||
| cpu-tic80.c | ||
| cpu-tilegx.c | ||
| cpu-tilepro.c | ||
| cpu-v850_rh850.c | ||
| cpu-v850.c | ||
| cpu-vax.c | ||
| cpu-visium.c | ||
| cpu-w65.c | ||
| cpu-we32k.c | ||
| cpu-xc16x.c | ||
| cpu-xgate.c | ||
| cpu-xstormy16.c | ||
| cpu-xtensa.c | ||
| cpu-z8k.c | ||
| cpu-z80.c | ||
| demo64.c | ||
| dep-in.sed | ||
| development.sh | ||
| dwarf1.c | ||
| dwarf2.c | ||
| ecoff.c | ||
| ecofflink.c | ||
| ecoffswap.h | ||
| elf32-am33lin.c | ||
| elf32-arc.c | ||
| elf32-arm.c | ||
| elf32-avr.c | ||
| elf32-avr.h | ||
| elf32-bfin.c | ||
| elf32-cr16.c | ||
| elf32-cr16c.c | ||
| elf32-cris.c | ||
| elf32-crx.c | ||
| elf32-d10v.c | ||
| elf32-d30v.c | ||
| elf32-dlx.c | ||
| elf32-dlx.h | ||
| elf32-epiphany.c | ||
| elf32-fr30.c | ||
| elf32-frv.c | ||
| elf32-ft32.c | ||
| elf32-gen.c | ||
| elf32-h8300.c | ||
| elf32-hppa.c | ||
| elf32-hppa.h | ||
| elf32-i370.c | ||
| elf32-i386.c | ||
| elf32-i860.c | ||
| elf32-i960.c | ||
| elf32-ip2k.c | ||
| elf32-iq2000.c | ||
| elf32-lm32.c | ||
| elf32-m32c.c | ||
| elf32-m32r.c | ||
| elf32-m68hc1x.c | ||
| elf32-m68hc1x.h | ||
| elf32-m68hc11.c | ||
| elf32-m68hc12.c | ||
| elf32-m68k.c | ||
| elf32-m88k.c | ||
| elf32-mcore.c | ||
| elf32-mep.c | ||
| elf32-metag.c | ||
| elf32-metag.h | ||
| elf32-microblaze.c | ||
| elf32-mips.c | ||
| elf32-moxie.c | ||
| elf32-msp430.c | ||
| elf32-mt.c | ||
| elf32-nds32.c | ||
| elf32-nds32.h | ||
| elf32-nios2.c | ||
| elf32-nios2.h | ||
| elf32-or1k.c | ||
| elf32-pj.c | ||
| elf32-ppc.c | ||
| elf32-ppc.h | ||
| elf32-rl78.c | ||
| elf32-rx.c | ||
| elf32-rx.h | ||
| elf32-s390.c | ||
| elf32-score7.c | ||
| elf32-score.c | ||
| elf32-score.h | ||
| elf32-sh64-com.c | ||
| elf32-sh64.c | ||
| elf32-sh64.h | ||
| elf32-sh-relocs.h | ||
| elf32-sh-symbian.c | ||
| elf32-sh.c | ||
| elf32-sparc.c | ||
| elf32-spu.c | ||
| elf32-spu.h | ||
| elf32-tic6x.c | ||
| elf32-tic6x.h | ||
| elf32-tilegx.c | ||
| elf32-tilegx.h | ||
| elf32-tilepro.c | ||
| elf32-tilepro.h | ||
| elf32-v850.c | ||
| elf32-vax.c | ||
| elf32-visium.c | ||
| elf32-xc16x.c | ||
| elf32-xgate.c | ||
| elf32-xgate.h | ||
| elf32-xstormy16.c | ||
| elf32-xtensa.c | ||
| elf32.c | ||
| elf64-alpha.c | ||
| elf64-gen.c | ||
| elf64-hppa.c | ||
| elf64-hppa.h | ||
| elf64-ia64-vms.c | ||
| elf64-mips.c | ||
| elf64-mmix.c | ||
| elf64-ppc.c | ||
| elf64-ppc.h | ||
| elf64-s390.c | ||
| elf64-sh64.c | ||
| elf64-sparc.c | ||
| elf64-tilegx.c | ||
| elf64-tilegx.h | ||
| elf64-x86-64.c | ||
| elf64.c | ||
| elf-attrs.c | ||
| elf-bfd.h | ||
| elf-eh-frame.c | ||
| elf-hppa.h | ||
| elf-ifunc.c | ||
| elf-linux-core.h | ||
| elf-m10200.c | ||
| elf-m10300.c | ||
| elf-nacl.c | ||
| elf-nacl.h | ||
| elf-s390-common.c | ||
| elf-strtab.c | ||
| elf-vxworks.c | ||
| elf-vxworks.h | ||
| elf.c | ||
| elfcode.h | ||
| elfcore.h | ||
| elflink.c | ||
| elfn32-mips.c | ||
| elfnn-aarch64.c | ||
| elfnn-ia64.c | ||
| elfnn-riscv.c | ||
| elfxx-aarch64.c | ||
| elfxx-aarch64.h | ||
| elfxx-ia64.c | ||
| elfxx-ia64.h | ||
| elfxx-mips.c | ||
| elfxx-mips.h | ||
| elfxx-riscv.c | ||
| elfxx-riscv.h | ||
| elfxx-sparc.c | ||
| elfxx-sparc.h | ||
| elfxx-target.h | ||
| elfxx-tilegx.c | ||
| elfxx-tilegx.h | ||
| epoc-pe-arm.c | ||
| epoc-pei-arm.c | ||
| format.c | ||
| freebsd.h | ||
| gen-aout.c | ||
| genlink.h | ||
| go32stub.h | ||
| hash.c | ||
| host-aout.c | ||
| hp300bsd.c | ||
| hp300hpux.c | ||
| hppabsd-core.c | ||
| hpux-core.c | ||
| i386aout.c | ||
| i386bsd.c | ||
| i386dynix.c | ||
| i386freebsd.c | ||
| i386linux.c | ||
| i386lynx.c | ||
| i386mach3.c | ||
| i386msdos.c | ||
| i386netbsd.c | ||
| i386os9k.c | ||
| ieee.c | ||
| ihex.c | ||
| init.c | ||
| irix-core.c | ||
| libaout.h | ||
| libbfd-in.h | ||
| libbfd.c | ||
| libbfd.h | ||
| libcoff-in.h | ||
| libcoff.h | ||
| libecoff.h | ||
| libhppa.h | ||
| libieee.h | ||
| libnlm.h | ||
| liboasys.h | ||
| libpei.h | ||
| libxcoff.h | ||
| linker.c | ||
| lynx-core.c | ||
| m68k4knetbsd.c | ||
| m68klinux.c | ||
| m68knetbsd.c | ||
| m88kmach3.c | ||
| m88kopenbsd.c | ||
| mach-o-aarch64.c | ||
| mach-o-arm.c | ||
| mach-o-i386.c | ||
| mach-o-target.c | ||
| mach-o-x86-64.c | ||
| mach-o.c | ||
| mach-o.h | ||
| MAINTAINERS | ||
| Makefile.am | ||
| Makefile.in | ||
| makefile.vms | ||
| mep-relocs.pl | ||
| merge.c | ||
| mipsbsd.c | ||
| mmo.c | ||
| netbsd-core.c | ||
| netbsd.h | ||
| newsos3.c | ||
| nlm32-alpha.c | ||
| nlm32-i386.c | ||
| nlm32-ppc.c | ||
| nlm32-sparc.c | ||
| nlm32.c | ||
| nlm64.c | ||
| nlm-target.h | ||
| nlm.c | ||
| nlmcode.h | ||
| nlmswap.h | ||
| ns32k.h | ||
| ns32knetbsd.c | ||
| oasys.c | ||
| opncls.c | ||
| osf-core.c | ||
| pc532-mach.c | ||
| pdp11.c | ||
| pe-arm-wince.c | ||
| pe-arm.c | ||
| pe-i386.c | ||
| pe-mcore.c | ||
| pe-mips.c | ||
| pe-ppc.c | ||
| pe-sh.c | ||
| pe-x86_64.c | ||
| pef-traceback.h | ||
| pef.c | ||
| pef.h | ||
| pei-arm-wince.c | ||
| pei-arm.c | ||
| pei-i386.c | ||
| pei-ia64.c | ||
| pei-mcore.c | ||
| pei-mips.c | ||
| pei-ppc.c | ||
| pei-sh.c | ||
| pei-x86_64.c | ||
| peicode.h | ||
| peXXigen.c | ||
| plugin.c | ||
| plugin.h | ||
| PORTING | ||
| ppcboot.c | ||
| ptrace-core.c | ||
| README | ||
| reloc16.c | ||
| reloc.c | ||
| riscix.c | ||
| rs6000-core.c | ||
| sco5-core.c | ||
| section.c | ||
| simple.c | ||
| som.c | ||
| som.h | ||
| sparclinux.c | ||
| sparclynx.c | ||
| sparcnetbsd.c | ||
| srec.c | ||
| stab-syms.c | ||
| stabs.c | ||
| stamp-h.in | ||
| sunos.c | ||
| syms.c | ||
| sysdep.h | ||
| targets.c | ||
| targmatch.sed | ||
| tekhex.c | ||
| TODO | ||
| trad-core.c | ||
| vax1knetbsd.c | ||
| vaxbsd.c | ||
| vaxnetbsd.c | ||
| verilog.c | ||
| versados.c | ||
| version.h | ||
| version.m4 | ||
| vms-alpha.c | ||
| vms-lib.c | ||
| vms-misc.c | ||
| vms.h | ||
| warning.m4 | ||
| xcofflink.c | ||
| xsym.c | ||
| xsym.h | ||
| xtensa-isa.c | ||
| xtensa-modules.c | ||
BFD is an object file library. It permits applications to use the
same routines to process object files regardless of their format.
BFD is used by the GNU debugger, assembler, linker, and the binary
utilities.
The documentation on using BFD is scanty and may be occasionally
incorrect. Pointers to documentation problems, or an entirely
rewritten manual, would be appreciated.
There is some BFD internals documentation in doc/bfdint.texi which may
help programmers who want to modify BFD.
BFD is normally built as part of another package. See the build
instructions for that package, probably in a README file in the
appropriate directory.
BFD supports the following configure options:
--target=TARGET
The default target for which to build the library. TARGET is
a configuration target triplet, such as sparc-sun-solaris.
--enable-targets=TARGET,TARGET,TARGET...
Additional targets the library should support. To include
support for all known targets, use --enable-targets=all.
--enable-64-bit-bfd
Include support for 64 bit targets. This is automatically
turned on if you explicitly request a 64 bit target, but not
for --enable-targets=all. This requires a compiler with a 64
bit integer type, such as gcc.
--enable-shared
Build BFD as a shared library.
--with-mmap
Use mmap when accessing files. This is faster on some hosts,
but slower on others. It may not work on all hosts.
Report bugs with BFD to bug-binutils@gnu.org.
Patches are encouraged. When sending patches, always send the output
of diff -u or diff -c from the original file to the new file. Do not
send default diff output. Do not make the diff from the new file to
the original file. Remember that any patch must not break other
systems. Remember that BFD must support cross compilation from any
host to any target, so patches which use ``#ifdef HOST'' are not
acceptable. Please also read the ``Reporting Bugs'' section of the
gcc manual.
Bug reports without patches will be remembered, but they may never get
fixed until somebody volunteers to fix them.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.