[Bug binutils/21150] New: global buffer overflow in nm.c

[thuanpv at comp dot nus.edu.sg]

https://sourceware.org/bugzilla/show_bug.cgi?id=21150

            Bug ID: 21150
           Summary: global buffer overflow in nm.c
           Product: binutils
           Version: 2.29 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: thuanpv at comp dot nus.edu.sg
  Target Milestone: ---

Created attachment 9818
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9818&action=edit
Bug triggering input

Dear all,

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

This bug was found on Ubuntu 14.04 64-bit & binutils was checkout from main
repository at git://sourceware.org/git/binutils-gdb.git. Its commit is
53f7e8ea7fad1fcff1b58f4cbd74e192e0bcbc1d (Fri Feb 10 00:00:16 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_16
nm-new --si bug_16

ASAN says:
==107219==ERROR: AddressSanitizer: global-buffer-overflow on address
0x0000017a69fe at pc 0x4a65c3 bp 0x7ffcfc8e0c70 sp 0x7ffcfc8e0c68
READ of size 1 at 0x0000017a69fe thread T0
    #0 0x4a65c2 in size_forward1
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/nm.c:693
    #1 0x7fea99955418 (/lib/x86_64-linux-gnu/libc.so.6+0x3b418)
    #2 0x7fea99955171 (/lib/x86_64-linux-gnu/libc.so.6+0x3b171)
    #3 0x7fea999556cb (/lib/x86_64-linux-gnu/libc.so.6+0x3b6cb)
    #4 0x495d94 in sort_symbols_by_size
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/nm.c:735
    #5 0x4923dd in display_rel_file
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/nm.c:1196
    #6 0x48da9c in display_file
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/nm.c:1319
    #7 0x48bd36 in main
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/nm.c:1793
    #8 0x7fea9993bf44 (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
    #9 0x48a9cc in _start
(/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/nm-new+0x48a9cc)

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