Disable eh_frame optimisation if code detected in .eh_frameHEADmaster

Fuzzers stress the assembler in ways no sane programmer would ever do.
One x86 oss-fuzz testcase (cleaned up a litte) was:
 .sect .debug_frame
 call x
 .long x,0
 .space 1
 .long 0,0
The call insn leaves the frag data corresponding to a CIE
uninitialised until later in assembly, leading to reports of
uninitialised data access in ehopt.c:check_eh_frame.

Hack around this problem by noticing an insn has been assembled in
dwarf2_emit_insn.  The existing frag has_code can't be used as that
leads to alignment complaints, so add a new segment_info flag.

	* subsegs.h (struct segment_info_struct): Move bss and hadone
	later.  Rename hadone to stab_seen.  Add insn_seen bitfield.
	* dwarf2dbg.c (dwarf2_emit_insn): Set insn_seen.
	* ehopt.c (check_eh_frame): Disable optimisation if insn_seen.
	* stabs.c (s_stab_generic): Adjust for hadone rename.

0 files changed, 0 insertions, 0 deletions