Created attachment 10995 [details]
crash

As part of a tool I'm writing I fuzzed binutils. The attached file makes objcopy crash inside `htab_hash_string`:

Program received signal SIGSEGV, Segmentation fault.
htab_hash_string (p=0xde89483b74ff8548) at ./hashtab.c:838
838       while ((c = *str++) != 0)
#0  htab_hash_string (p=0xde89483b74ff8548) at ./hashtab.c:838
#1  0x00000000004c7151 in htab_find (htab=0x72e1c0, element=0xde89483b74ff8548) at ./hashtab.c:621
#2  0x000000000040685c in is_specified_symbol (name=<optimized out>, htab=<optimized out>) at objcopy.c:1195
#3  0x0000000000406904 in is_strip_section (sec=sec@entry=0x730950, abfd=0x72ef40) at objcopy.c:1357
#4  0x0000000000406db5 in skip_section (ibfd=0x72ef40, isection=0x730950, skip_copy=1) at objcopy.c:3849
#5  0x0000000000406e4f in copy_section (ibfd=0x72ef40, isection=0x730950, obfdarg=0x7322e0) at objcopy.c:4026
#6  0x000000000042639c in bfd_map_over_sections (abfd=abfd@entry=0x72ef40, operation=operation@entry=0x406e20 <copy_section>, user_storage=user_storage@entry=0x7322e0) at section.c:1391
#7  0x0000000000408864 in copy_object (ibfd=<optimized out>, obfd=<optimized out>, input_arch=<optimized out>) at objcopy.c:3057
#8  0x000000000040a63a in copy_file (input_filename=input_filename@entry=0x7fffffffe139 "id:000011,sig:1"..., output_filename=output_filename@entry=0x7fffffffe164 "/dev/null", input_target=input_target@entry=0x0, output_target=<optimized out>, output_target@entry=0x0, input_arch=input_arch@entry=0x0) at objcopy.c:3532
#9  0x0000000000403334 in copy_main (argv=<optimized out>, argc=<optimized out>) at objcopy.c:5484
#10 main (argc=argc@entry=3, argv=argv@entry=0x7fffffffdd98) at objcopy.c:5588
#11 0x00007ffff7829830 in __libc_start_main (main=0x402ea0 <main>, argc=3, argv=0x7fffffffdd98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdd88) at ../csu/libc-start.c:291
#12 0x00000000004055c9 in _start ()

Compiled and tried against a freshly cloned repo. It also works on Ubuntu Xenial's binutils (2.26.1). X86_64 machine.