[Bug binutils/21412] New: global-buffer-overflow in objcopy

[dungnguy at comp dot nus.edu.sg]

https://sourceware.org/bugzilla/show_bug.cgi?id=21412

            Bug ID: 21412
           Summary: global-buffer-overflow in objcopy
           Product: binutils
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: dungnguy at comp dot nus.edu.sg
  Target Milestone: ---

Created attachment 10008
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10008&action=edit
Bug triggering input

Dear All,

This bug was found with AFLGo, a directed version of AFL/AFLFast. Thanks also
to Marcel Böhme and Van-Thuan Pham.

This bug was found on Ubuntu 14.04 64-bit & binutils was checked out from main
repository at git://sourceware.org/git/binutils-gdb.git. Its commit is
a6c21d4a553de184562fd8409a5bcd3f2cc2561a (Wed Apr 19 13:16:05 2017).

binutils was built with ASAN using gcc-6.2 and clang-3.4. The configure command
was:

CC=clang CFLAGS="-DFORTIFY_SOURCE=2 -fstack-protector-all
-fsanitize=undefined,address -fno-omit-frame-pointer -g -Wno-error"
../configure --disable-shared --disable-gdb --disable-libdecnumber
--disable-readline --disable-sim

To reproduce:
Download the attached file - bug_1
objcopy --compress-debug-sections bug_1

ASAN says:
==149346==ERROR: AddressSanitizer: global-buffer-overflow on address
0x000001a69aa4 at pc 0x00000044f150 bp 0x7ffe5c0b4d90 sp 0x7ffe5c0b4550
READ of size 1 at 0x000001a69aa4 thread T0
    #0 0x44f14f in __interceptor_strcmp
(/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/objcopy+0x44f14f)
    #1 0xb11a0a in _bfd_elf_get_reloc_section
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/elf.c:3568:10
    #2 0xb3e092 in assign_section_numbers
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/elf.c:3844:8
    #3 0xb15eb0 in _bfd_elf_compute_section_file_positions
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/elf.c:4184:8
    #4 0xb7af5f in _bfd_elf_write_object_contents
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/elf.c:6289:12
    #5 0x846b86 in bfd_close
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/opncls.c:733:13
    #6 0x4ebecf in copy_file
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objcopy.c:3340:51
    #7 0x4d6716 in copy_main
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objcopy.c:5266:3
    #8 0x4cac8a in main
/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objcopy.c:5367:5
    #9 0x7f1ca55e3f44 in __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287
    #10 0x4ca31c in _start
(/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/objcopy+0x4ca31c)

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