[Bug binutils/23144] New: strip-new/objcopy: SIGSEGV in group_signature

[paolo.montesel+sourceware at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=23144

            Bug ID: 23144
           Summary: strip-new/objcopy: SIGSEGV in group_signature
           Product: binutils
           Version: 2.31 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: paolo.montesel+sourceware at gmail dot com
  Target Milestone: ---

Created attachment 10996
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10996&action=edit
crash

As part of a tool I'm writing I fuzzed binutils. The attached file makes
strip-new/objcopy crash inside `group_signature`:

Program received signal SIGSEGV, Segmentation fault.
0x00000000004063f6 in group_signature (group=0x72d950, group=0x72d950) at
objcopy.c:1222
1222            return isympp[ghdr->sh_info - 1];
#0  0x00000000004063f6 in group_signature (group=0x72d950, group=0x72d950) at
objcopy.c:1222
#1  0x000000000040684f in is_strip_section (address@hidden,
abfd=0x72bf40) at objcopy.c:1350
#2  0x000000000040690f in setup_section (ibfd=0x72bf40, isection=0x72d950,
obfdarg=0x72f2e0) at objcopy.c:3677
#3  0x000000000042602c in bfd_map_over_sections (address@hidden,
address@hidden <setup_section>,
address@hidden) at section.c:1391
#4  0x00000000004079ea in copy_object (ibfd=0x72bf40, obfd=0x72f2e0,
input_arch=<optimized out>) at objcopy.c:2627
#5  0x000000000040a5aa in copy_file (input_filename=0x7fffffffe136
"id:000012,sig:1"..., address@hidden
"/dev/null", address@hidden, output_target=<optimized
out>, address@hidden, address@hidden) at
objcopy.c:3532
#6  0x0000000000404929 in strip_main (argv=<optimized out>, argc=<optimized
out>) at objcopy.c:4476
#7  main (address@hidden, address@hidden) at objcopy.c:5586
#8  0x00007ffff7829830 in __libc_start_main (main=0x402e10 <main>, argc=4,
argv=0x7fffffffdd78, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffdd68) at ../csu/libc-start.c:291
#9  0x0000000000405539 in _start ()

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

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