[Bug binutils/18758] New: several undefined behaviors in objdump and strings

[xiedingbao at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18758

            Bug ID: 18758
           Summary: several undefined behaviors in objdump and strings
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: minor
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: xiedingbao at gmail dot com
  Target Milestone: ---

Created attachment 8473
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8473&action=edit
inputs to reproduce the undefined behaviors

Hi, I found several undefined behaviors in binutils, 
version: GNU Binutils 2.25.51.20150728 and my OS is ubuntu-14 64bit.

To reproduce them, first build the source code with ubsan and then execute
command: objdump -x $file (in attachment),
you will see the following error information:

../../binutils-git/bfd/elf.c:845:28: runtime error: member access within null
pointer of type 'asection' (aka 'struct bfd_section')
../../binutils-git/bfd/elf.c:845:28: runtime error: load of null pointer of
type 'const char *'
Segmentation fault (core dumped)



execute command: strings -d $file (in attachment),
you will see the following error information:

../../binutils-git/bfd/peicode.h:644:40: runtime error: member access within
misaligned address 0x000002fedda4 for type 'struct coff_section_tdata', which
requires 8 byte alignment
0x000002fedda4: note: pointer points here
  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
              ^ 
../../binutils-git/bfd/peicode.h:487:47: runtime error: member access within
misaligned address 0x000002fede5c for type 'struct coff_section_tdata', which
requires 8 byte alignment
0x000002fede5c: note: pointer points here
  00 64 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
              ^ 
../../binutils-git/bfd/peicode.h:501:40: runtime error: member access within
misaligned address 0x000002fedda4 for type 'struct coff_section_tdata', which
requires 8 byte alignment
0x000002fedda4: note: pointer points here
  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00

              ^ 
../../binutils-git/bfd/peicode.h:502:40: runtime error: member access within
misaligned address 0x000002fedda4 for type 'struct coff_section_tdata', which
requires 8 byte alignment
0x000002fedda4: note: pointer points here
  00 00 00 00 40 dc fe 02  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00
00 00 00 00 00 00 00
../../binutils-git/bfd/peicode.h:869:7: runtime error: store to misaligned
address 0x000003096d97 for type 'unsigned int', which requires 4 byte alignment
0x000003096d97: note: pointer points here
 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00
00 00 00 00  00 00 00
             ^ 
../../binutils-git/bfd/peicode.h:870:7: runtime error: store to misaligned
address 0x000003096df3 for type 'unsigned int', which requires 4 byte alignment
0x000003096df3: note: pointer points here
 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 
00 00 00 00 00 00 00

Can you please take a look?

-- 
You are receiving this mail because:
You are on the CC list for the bug.