[Bug binutils/29924] New: Huge memoy allocation in objdump

[pdeng21 at m dot fudan.edu.cn]

https://sourceware.org/bugzilla/show_bug.cgi?id=29924

            Bug ID: 29924
           Summary: Huge memoy allocation in objdump
           Product: binutils
           Version: 2.39
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: pdeng21 at m dot fudan.edu.cn
  Target Milestone: ---

Created attachment 14533
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14533&action=edit
PoC to replay the vulnerability

#Summary
There is a huge memory allocation vulnerability in objdump, which can be
triggered by a craft elf file.

#Verification
git clone git://sourceware.org/git/binutils-gdb.git
CC="clang -fsanitize=address" CXX="clang++ -fsanitize=address" ./configure
--disable-shared && make -j$(nproc)
./binutils/objdump -S poc

#ASAN
=================================================================
==23722==ERROR: AddressSanitizer: allocator is out of memory trying to allocate
0x3000000001 bytes
    #0 0x4942ed in malloc (/binutils-gdb/binutils/objdump+0x4942ed)
    #1 0x8410c8 in xmalloc /binutils-gdb/libiberty/./xmalloc.c:149:12
    #2 0x4dbb9d in load_separate_debug_files
/binutils-gdb/binutils/./dwarf.c:11965:7
    #3 0x4c6e60 in display_object_bfd /binutils-gdb/binutils/./objdump.c
    #4 0x4c6e60 in display_any_bfd /binutils-gdb/binutils/./objdump.c:5823:5
    #5 0x4c5604 in display_file /binutils-gdb/binutils/./objdump.c:5844:3
    #6 0x4c5604 in main /binutils-gdb/binutils/./objdump.c:6252:6
    #7 0x7f08291dec86 in __libc_start_main
/build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:310

==23722==HINT: if you don't care about these errors you may set
allocator_may_return_null=1
SUMMARY: AddressSanitizer: out-of-memory
(/binutils-gdb/binutils/objdump+0x4942ed) in malloc
==23722==ABORTING

#Envieonment
Ubuntu 18.04
clang 10.0.0

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