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From: "wcventure at 126 dot com" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug tools/23755] New: Multiple floating point exception in findtextrel.c in eu-findtextrel biniary of elfutils-v.0174.
Date: Wed, 10 Oct 2018 13:02:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D23755

            Bug ID: 23755
           Summary: Multiple floating point exception in findtextrel.c in
                    eu-findtextrel biniary of elfutils-v.0174.
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: tools
          Assignee: unassigned at sourceware dot org
          Reporter: wcventure at 126 dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Created attachment 11311
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D11311&action=3Ded=
it
POC

Hi,

I found some floating point exception in findtextrel.c in eu-findtextrel of=
 the
latest elfutils-0.174 code base. I have confirmed them with GDB and address
sanitizer.

Here are the POC files. I'll also show you the debugging process. It seems =
that
this is caused by the divide-by-zero problem.

> gdb --args ./eu-findtextrel POC3-findtextrel
> GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
> ...
> Reading symbols from ./eu-findtextrel...done.
> (gdb) b 418
> Breakpoint 1 at 0x40379c: file findtextrel.c, line 418.
> (gdb) start
> Temporary breakpoint 2, main (argc=3D2, argv=3D0x7ffffffedfc8) at findtex=
trel.c:107
> 107     {
> (gdb) c
> Continuing.
> Breakpoint 1, process_file (fname=3D0x7ffffffee247 "POC3-findtextrel", mo=
re_than_one=3Dfalse) at findtextrel.c:418
> 418                        (size_t) cnt < shdr->sh_size / shdr->sh_entsiz=
e;
> (gdb) p shdr->sh_entsize
> $2 =3D 0
> (gdb) n
>=20
> Program received signal SIGFPE, Arithmetic exception.
> 0x0000000000403810 in process_file (fname=3D0x7ffffffee247 "POC3-findtext=
rel", more_than_one=3Dfalse) at findtextrel.c:418
> 418                        (size_t) cnt < shdr->sh_size / shdr->sh_entsiz=
e;

--=20
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