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Maciej W. Rozycki e54cb31aa3 MIPS/LD: Fix a segfault from ELF `e_flags' access with non-ELF output BFD 
Fix a commit 861fb55ab50a ("Defer allocation of R_MIPS_REL32 GOT
slots"), <https://sourceware.org/ml/binutils/2008-08/msg00096.html>,
regression and a more recent:

FAIL: ld-unique/pr21529

new LD test case failure, observed with all the relevant MIPS targets
whenever the linker is invoked with one or more ELF inputs and the
output format set to `binary'.

The culprit is a segmentation fault caused in `mips_before_allocation'
by a null pointer dereference, where an attempt is made to access the
ELF file header's `e_flags' member, for the purpose of determining
whether to produce a PLT and copy relocations, without first checking
that the output BFD is ELF.  The `e_flags' member is stored in BFD's
private data pointed to by `tdep', which in the case of the `binary' BFD
is null, causing the segmentation fault.  With other non-ELF BFDs such
as SREC `tdep' is not null and consequently no crash may happen and in
that case random data will be interpreted as it was `e_flags'.

Disable the access to `e_flags' then and all the associated checks and
consequently never produce a PLT and copy relocations if output is not a
MIPS ELF BFD, matching `_bfd_mips_elf_merge_private_bfd_data' that does
not process `e_flags' in that case either and therefore does not let us
decide here anyway if all the input objects included in the link are
suitable for use with a PLT and copy relocations.

	ld/
	* emultempl/mipself.em (mips_before_allocation): Avoid ELF
	processing if not MIPS ELF.
	* testsuite/ld-mips-elf/binary.d: New test.
	* testsuite/ld-mips-elf/binary.ld: New test linker script.
	* testsuite/ld-mips-elf/binary.s: New test source.
	* testsuite/ld-mips-elf/mips-elf.exp: Run the new test.
2017-07-07 17:58:03 +01:00
..
aarch64elf.em
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aix.em
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alphaelf.em
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arclinux.em
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armcoff.em
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armelf.em
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astring.sed
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avrelf.em
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beos.em
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bfin.em
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cr16elf.em
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crxelf.em
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elf32.em
Don't attach linker created section to --just-syms bfd
2017-06-26 09:10:22 +09:30
elf-generic.em
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epiphanyelf_4x4.em
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genelf.em
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generic.em
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gld960.em
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gld960c.em
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hppaelf.em
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ia64elf.em
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irix.em
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linux.em
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lnk960.em
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m68hc1xelf.em
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m68kcoff.em
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m68kelf.em
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metagelf.em
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mipself.em
MIPS/LD: Fix a segfault from ELF `e_flags' access with non-ELF output BFD
2017-07-07 17:58:03 +01:00
mmix-elfnmmo.em
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mmixelf.em
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mmo.em
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msp430.em
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needrelax.em
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netbsd.em
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nios2elf.em
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ostring.sed
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pe.em
Don't compare boolean values against TRUE or FALSE
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pep.em
Don't compare boolean values against TRUE or FALSE
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ppc32elf.em
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ppc64elf.em
PPC64_OPT_LOCALENTRY
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pruelf.em
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README
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rxelf.em
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s390.em
S/390: Add support for pgste marker
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scoreelf.em
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sh64elf.em
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solaris2.em
Solaris2/LD: Fix anonymous version script acceptance bug
2017-01-24 12:53:52 +00:00
spu_icache.o_c
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spu_icache.S
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spu_ovl.o_c
Regenerate spu_ovl.o_c
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spu_ovl.S
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spuelf.em
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sunos.em
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vxworks.em
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xtensaelf.em
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z80.em
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