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[Bug binutils/25220] New: objcopy : free() invalid pointer

From: fdgkhdkgh at gmail dot com
Subject: [Bug binutils/25220] New: objcopy : free() invalid pointer
Date: Sat, 23 Nov 2019 06:13:48 +0000


            Bug ID: 25220
           Summary: objcopy : free() invalid pointer
           Product: binutils
           Version: 2.34 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: fdgkhdkgh at gmail dot com
  Target Milestone: ---

Created attachment 12088
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12088&action=edit
file that reproduces this problem

binutils Version : 2.34(HEAD)
git clone git://sourceware.org/git/binutils-gdb.git

OS : ubuntu 18.04.3
kernel : gnu/linux 5.0.0-32-generic
processor : Intel(R) Core(TM) i5-8400 CPU @ 2.80GHz
compiler : gcc 7.4.0

Steps to Reproduce :
download the sample from attachment

objcopy --add-symbol 'abc'='.text:123,before=.data'  ./a.out

the function "need_sym_before" in objcopy.c will free the address on the .text
section, and then trigger "SIGABRT" 

gdb backtrace :

#0  __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff7820801 in __GI_abort () at abort.c:79
#2  0x00007ffff7869897 in __libc_message (action=action@entry=do_abort,
fmt=fmt@entry=0x7ffff7996b9a "%s\n") at ../sysdeps/posix/libc_fatal.c:181
#3  0x00007ffff787090a in malloc_printerr (str=str@entry=0x7ffff7994d88
"free(): invalid pointer") at malloc.c:5350
#4  0x00007ffff7877e1c in _int_free (have_lock=0x0, p=0x55555565b1dc,
av=0x7ffff7bcbc40 <main_arena>) at malloc.c:4157
#5  __GI___libc_free (mem=0x55555565b1ec) at malloc.c:3124
#6  0x000055555558b945 in need_sym_before (sym=<optimized out>, node=<optimized
out>) at objcopy.c:1469
#7  filter_symbols (symcount=<optimized out>, isyms=<optimized out>,
osyms=0x5555558b5cb0, obfd=0x5555558b34d0, abfd=0x5555558ab460) at
#8  copy_object (ibfd=0x5555558ab460, obfd=<optimized out>,
input_arch=<optimized out>) at objcopy.c:3197
#9  0x000055555558e029 in copy_file (input_filename=0x7fffffffe381 "./a.out",
output_filename=0x7fffffffe389 "./arbitrary_file_name", input_target=<optimized
out>, output_target=<optimized out>, input_arch=0x0)
    at objcopy.c:3788
#10 0x0000555555588170 in copy_main (argv=<optimized out>, argc=<optimized
out>) at objcopy.c:5838
#11 main (argc=<optimized out>, argc@entry=0x5, argv=<optimized out>,
argv@entry=0x7fffffffdfc8) at objcopy.c:5964
#12 0x00007ffff7801b97 in __libc_start_main (main=0x555555586520 <main>,
argc=0x5, argv=0x7fffffffdfc8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffdfb8)
    at ../csu/libc-start.c:310
#13 0x000055555558901a in _start ()


gdb peda report:

RAX: 0x0 
RBX: 0x7fffffffda60 --> 0xffffffffffffffb0 
RCX: 0x7ffff781ee97 (<__GI_raise+199>:  mov    rcx,QWORD PTR [rsp+0x108])
RDX: 0x0 
RSI: 0x7fffffffd7f0 --> 0x0 
RDI: 0x2 
RBP: 0x7fffffffdb60 --> 0xffffffffffffffb0 
RSP: 0x7fffffffd7f0 --> 0x0 
RIP: 0x7ffff781ee97 (<__GI_raise+199>:  mov    rcx,QWORD PTR [rsp+0x108])
R8 : 0x0 
R9 : 0x7fffffffd7f0 --> 0x0 
R10: 0x8 
R11: 0x246 
R12: 0x7fffffffda60 --> 0xffffffffffffffb0 
R13: 0x1000 
R14: 0x0 
R15: 0x30 ('0')
EFLAGS: 0x246 (carry PARITY adjust ZERO sign trap INTERRUPT direction overflow)
   0x7ffff781ee8b <__GI_raise+187>:     mov    edi,0x2
   0x7ffff781ee90 <__GI_raise+192>:     mov    eax,0xe
   0x7ffff781ee95 <__GI_raise+197>:     syscall 
=> 0x7ffff781ee97 <__GI_raise+199>:     mov    rcx,QWORD PTR [rsp+0x108]
   0x7ffff781ee9f <__GI_raise+207>:     xor    rcx,QWORD PTR fs:0x28
   0x7ffff781eea8 <__GI_raise+216>:     mov    eax,r8d
   0x7ffff781eeab <__GI_raise+219>:     jne    0x7ffff781eecc <__GI_raise+252>
   0x7ffff781eead <__GI_raise+221>:     add    rsp,0x118
0000| 0x7fffffffd7f0 --> 0x0 
0008| 0x7fffffffd7f8 --> 0xfe0 
0016| 0x7fffffffd800 --> 0x6200000000 ('')
0024| 0x7fffffffd808 --> 0x7 
0032| 0x7fffffffd810 --> 0x0 
0040| 0x7fffffffd818 --> 0x5555558a97f8 --> 0x7ffff77de398 -->
0048| 0x7fffffffd820 --> 0x1010 
0056| 0x7fffffffd828 --> 0xfe0 
Legend: code, data, rodata, value
Stopped reason: SIGABRT
__GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:51

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