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.

1 files changed, 9 insertions, 6 deletions

diff --git a/ld/emultempl/mipself.em b/ld/emultempl/mipself.em
index cd68707..d541fef 100644
--- a/ld/emultempl/mipself.em
+++ b/ld/emultempl/mipself.em
@@ -214,13 +214,16 @@ mips_create_output_section_statements (void)
 static void
 mips_before_allocation (void)
 {
-  flagword flags;
+  if (is_mips_elf (link_info.output_bfd))
+    {
+      flagword flags;
 
-  flags = elf_elfheader (link_info.output_bfd)->e_flags;
-  if (!bfd_link_pic (&link_info)
-      && !link_info.nocopyreloc
-      && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
-    _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
+      flags = elf_elfheader (link_info.output_bfd)->e_flags;
+      if (!bfd_link_pic (&link_info)
+	  && !link_info.nocopyreloc
+	  && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
+	_bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
+    }
 
   gld${EMULATION_NAME}_before_allocation ();
 }