[Bug binutils/21159] New: readelf of-by-one -- seems to be related to PR 21135

[thuanpv at comp dot nus.edu.sg]

https://sourceware.org/bugzilla/show_bug.cgi?id=21159

            Bug ID: 21159
           Summary: readelf of-by-one -- seems to be related to PR 21135
           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 9826
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9826&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 checked out from main
repository at git://sourceware.org/git/binutils-gdb.git. Its commit is
61697d017e114d7667fbb340fb73f8184d48ee5a (Tue Feb 14 00:00:30 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_3
readelf -zR8 bug_3



Valgrind says:
==43329== Invalid read of size 1
==43329==    at 0x41E760: dump_section_as_bytes (readelf.c:12894)
==43329==    by 0x42355B: process_section_contents (readelf.c:13201)
==43329==    by 0x42355B: process_object (readelf.c:16899)
==43329==    by 0x402111: process_file (readelf.c:17273)
==43329==    by 0x402111: main (readelf.c:17344)
==43329==  Address 0x52036ce is 0 bytes after a block of size 78 alloc'd
==43329==    at 0x4C2AB80: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==43329==    by 0x40574E: get_data (readelf.c:393)
==43329==    by 0x41E5AB: dump_section_as_bytes (readelf.c:12785)
==43329==    by 0x42355B: process_section_contents (readelf.c:13201)
==43329==    by 0x42355B: process_object (readelf.c:16899)
==43329==    by 0x402111: process_file (readelf.c:17273)
==43329==    by 0x402111: main (readelf.c:17344)
==43329== 
==43329== Invalid read of size 1
==43329==    at 0x41E7C8: dump_section_as_bytes (readelf.c:12905)
==43329==    by 0x42355B: process_section_contents (readelf.c:13201)
==43329==    by 0x42355B: process_object (readelf.c:16899)
==43329==    by 0x402111: process_file (readelf.c:17273)
==43329==    by 0x402111: main (readelf.c:17344)
==43329==  Address 0x52036ce is 0 bytes after a block of size 78 alloc'd
==43329==    at 0x4C2AB80: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==43329==    by 0x40574E: get_data (readelf.c:393)
==43329==    by 0x41E5AB: dump_section_as_bytes (readelf.c:12785)
==43329==    by 0x42355B: process_section_contents (readelf.c:13201)
==43329==    by 0x42355B: process_object (readelf.c:16899)
==43329==    by 0x402111: process_file (readelf.c:17273)
==43329==    by 0x402111: main (readelf.c:17344)

ASAN says:
==48173==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60700000d88e at pc 0x56090c bp 0x7ffc4f4c1d50 sp 0x7ffc4f4c1d48
READ of size 1 at 0x60700000d88e thread T0
    #0 0x56090b in dump_section_as_bytes
/home/ubuntu/thesis/subjects/binutils-gdb-nick/build-asan/binutils/../../binutils/readelf.c:12894
    #1 0x4e1661 in process_section_contents
/home/ubuntu/thesis/subjects/binutils-gdb-nick/build-asan/binutils/../../binutils/readelf.c:13201
    #2 0x48d720 in process_object
/home/ubuntu/thesis/subjects/binutils-gdb-nick/build-asan/binutils/../../binutils/readelf.c:16899
    #3 0x488475 in process_file
/home/ubuntu/thesis/subjects/binutils-gdb-nick/build-asan/binutils/../../binutils/readelf.c:17273
    #4 0x4856d3 in main
/home/ubuntu/thesis/subjects/binutils-gdb-nick/build-asan/binutils/../../binutils/readelf.c:17344
    #5 0x7ff239209f44 (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
    #6 0x47ddfc in _start
(/home/ubuntu/thesis/subjects/binutils-gdb-nick/build-asan/binutils/readelf+0x47ddfc)

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