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Maciej W. Rozycki aec2e0d252 MIPS64/BFD: Fix a crash with STN_UNDEF in relocation
Prevent a null BFD pointer dereference and a resulting segmentation
fault in `mips_elf64_write_rel' or `mips_elf64_write_rela':

Program received signal SIGSEGV, Segmentation fault.
0x0000000000437690 in mips_elf64_write_rela (abfd=0x71e130, sec=0x720700,
    rela_hdr=0x721ff8, count=0x7fffffffb82c, data=0x7fffffffb88c)
    at .../bfd/elf64-mips.c:4123
4123	      if ((*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec
4124		  && ! _bfd_elf_validate_reloc (abfd, ptr))

in the MIPS64 (n64 MIPS) ELF backend whenever the STN_UNDEF symbol index
is retrieved from the `r_sym' field of a relocation seen in input while
running `objcopy' or `strip'.  The reason for the null BFD pointer is
that internally in BFD an STN_UNDEF symbol reference resolves to an
absolute zero symbol that does not have a BFD associated.  Check the
pointer then before using it, like the generic ELF backend does in
`elf_write_relocs'.

This complements the same change made for generic ELF bundled with:

commit e35765a9a2
Author: Ian Lance Taylor <ian@airs.com>
Date:   Sun Dec 15 19:59:18 1996 +0000

which (obviously due to a CVS -> GIT repository conversion inaccuracy)
seems to be one corresponding to this ChangeLog entry:

	* elfcode.h (write_relocs): Handle absolute symbol.

from:

commit c86158e591
Author: Ian Lance Taylor <ian@airs.com>
Date:   Fri Aug 30 22:09:51 1996 +0000

("Add SH ELF support."), which also updated RELA only and not REL (which
has been since fixed with: commit 947216bf8f ("ELF reloc code tidy"),
<https://sourceware.org/ml/binutils/2002-11/msg00727.html>).

	bfd/
	* elf64-mips.c (mips_elf64_write_rel): Handle a NULL BFD pointer
	in the BFD symbol referred by the relocation.
	(mips_elf64_write_rela): Likewise.
2018-04-09 13:42:00 +01:00
bfd MIPS64/BFD: Fix a crash with STN_UNDEF in relocation 2018-04-09 13:42:00 +01:00
binutils binutils/testsuite: Verify the handling of invalid `r_sym' in relocation 2018-04-09 13:42:00 +01:00
config config: Sync with GCC 2018-04-05 15:22:13 -07:00
cpu
elfcpp PowerPC inline PLT call support 2018-04-09 17:25:20 +09:30
etc
gas Use dlsym to check if libdl is needed for plugin 2018-04-05 15:31:53 -07:00
gdb Fix gdb.mi/mi-stack.exp when gcc generates a stack protector 2018-04-07 14:09:14 -04:00
gold PowerPC inline PLT call support 2018-04-09 17:25:20 +09:30
gprof Use dlsym to check if libdl is needed for plugin 2018-04-05 15:31:53 -07:00
include PowerPC inline PLT call support 2018-04-09 17:25:20 +09:30
intl
ld Inline PLT call optimization 2018-04-09 17:40:54 +09:30
libdecnumber
libiberty
opcodes i386: Clear vex instead of vex.evex 2018-04-04 04:36:44 -07:00
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		   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.
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	./configure 
	make

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	CC=gcc ./configure
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A similar example using csh:

	setenv CC gcc
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	make

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