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* the dynamic linker bug
@ 1997-12-12  3:55 Ulrich Drepper
  1997-12-12  1:52 ` H.J. Lu
  0 siblings, 1 reply; 5+ messages in thread
From: Ulrich Drepper @ 1997-12-12  3:55 UTC (permalink / raw)
  To: egcs, gcc2; +Cc: drepper

Hi,

I describe here what I found out.  I cannot produce a small test case
but I can compare two assembler outputs and explain the context with
the sources.  All this is on ix86.  At then end of the mail is the
preprocessed source.  You have to run

	gcc /tmp/dl-reloc.i -Wall -c -O3 -g -momit-leaf-frame-pointer -mpentium  -fPIC -fno-common -o dl-reloc.o


I tried to remove the -Wall but this changes the result!!!!!


The critical part of the code is compiled using the current CVS egcs
version (ok, the CVS version as of yesterday):

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2d7:   89 45 b0        movl   %eax,0xffffffb0(%ebp)
 2da:   83 bd 50 ff ff  cmpl   $0x0,0xffffff50(%ebp)
 2df:   ff 00 
 2e1:   74 35           je     318 <_dl_relocate_object+0x318>
 2e3:   8b 8d 50 ff ff  movl   0xffffff50(%ebp),%ecx
 2e8:   ff 
 2e9:   83 79 04 00     cmpl   $0x0,0x4(%ecx)
 2ed:   74 29           je     318 <_dl_relocate_object+0x318>
 2ef:   52              pushl  %edx
 2f0:   51              pushl  %ecx
 2f1:   8b 7d c8        movl   0xffffffc8(%ebp),%edi
 2f4:   8b 57 fc        movl   0xfffffffc(%edi),%edx
 2f7:   8b 02           movl   (%edx),%eax
 2f9:   8b 40 04        movl   0x4(%eax),%eax
 2fc:   50              pushl  %eax
 2fd:   8b 42 04        movl   0x4(%edx),%eax
 300:   50              pushl  %eax
 301:   8d 45 e8        leal   0xffffffe8(%ebp),%eax
 304:   50              pushl  %eax
 305:   8b 45 e8        movl   0xffffffe8(%ebp),%eax
 308:   8b 00           movl   (%eax),%eax
 30a:   03 47 f8        addl   0xfffffff8(%edi),%eax
 30d:   50              pushl  %eax
 30e:   e8 fc ff ff ff  call   30f <_dl_relocate_object+0x30f>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Using an older version 2.90.15 I get:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2d7:   89 45 b0        movl   %eax,0xffffffb0(%ebp)
 2da:   83 bd 50 ff ff  cmpl   $0x0,0xffffff50(%ebp)
 2df:   ff 00 
 2e1:   74 35           je     318 <_dl_relocate_object+0x318>
 2e3:   8b 8d 50 ff ff  movl   0xffffff50(%ebp),%ecx
 2e8:   ff 
 2e9:   83 79 04 00     cmpl   $0x0,0x4(%ecx)
 2ed:   74 29           je     318 <_dl_relocate_object+0x318>
 2ef:   52              pushl  %edx
 2f0:   51              pushl  %ecx
 2f1:   8b 7d c8        movl   0xffffffc8(%ebp),%edi
 2f4:   8b 57 fc        movl   0xfffffffc(%edi),%edx
 2f7:   8b 02           movl   (%edx),%eax
 2f9:   8b 40 04        movl   0x4(%eax),%eax
 2fc:   50              pushl  %eax
 2fd:   8b 42 04        movl   0x4(%edx),%eax
 300:   50              pushl  %eax
 301:   8d 45 e8        leal   0xffffffe8(%ebp),%eax
 304:   50              pushl  %eax
 305:   8b 4d b0        movl   0xffffffb0(%ebp),%ecx
 308:   8b 01           movl   (%ecx),%eax
 30a:   03 47 f8        addl   0xfffffff8(%edi),%eax
 30d:   50              pushl  %eax
 30e:   e8 fc ff ff ff  call   30f <_dl_relocate_object+0x30f>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The critical instruction is at address 305.  You see the difference

wrong:		 305:   8b 45 e8        movl   0xffffffe8(%ebp),%eax

correct:	 305:   8b 4d b0        movl   0xffffffb0(%ebp),%ecx


The other key location is 2d7 where is both pieces of code 0xffffffb0(%ebp)
is initialized.


Looking at the source code you'll see this implements the following
(function elf_machine_rel, a bit reformatted):


      const Elf32_Sym *const refsym = sym;
      Elf32_Addr value = ((  version ) != ((void *)0)
			  && (  version )->hash != 0
    ? _dl_lookup_versioned_symbol (strtab + (* &sym )->st_name,
			           ( &sym ), scope, l->l_name,
                                   (  version ), (  (( reloc->r_info ) & 0xff)  ))
    : _dl_lookup_symbol (strtab + (* &sym )->st_name, ( &sym ), scope,
                         l->l_name, (  (( reloc->r_info ) & 0xff)  ))) ;


The call is too `_dl_lookup_versioned_symbol' ad the parameter we are
dealing with is the first which is computed as

	strtab + (* &sym )->st_name

Please note that the second parameter is `&sym'.

Back to the assembler code: Obviously at address 30a the value of
`strtab' is added.  The `st_name' element of `Elf32_Sym' is the first,
i.e., the

	movl   (%ecx),%eax

if the dereference of the pointer.  But this means the %ecx (or %eax
in the wrong code, both solutions are equivalent here) has to be the
pointer `sym'.  This value is loaded at address 305.

In the correct case it is loaded from 0xffffffb0(%ebp) which was
initialized at address 2d7.


But in the wrong case %eax is loaded from 0xffffffe8(%ebp).  Please
note that this is the address which was pushed for the second
parameter before.  The error is that at address 2d7 the value at
address 0xffffffb0(%ebp) is initialized, as for the correct version.
But this does not mean anything but that at address 305 uninitialized
memory is read.


So the problem is: why is at address 305 0xffffffe8(%ebp) read and not
0xffffffb0(%ebp)?



-- Uli
---------------.      drepper at gnu.org  ,-.   Rubensstrasse 5
Ulrich Drepper  \    ,-------------------'   \  76149 Karlsruhe/Germany
Cygnus Solutions `--' drepper at cygnus.com   `------------------------

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;19)5B^.417]2A'QI7%L5O^W^'X"XRVV.^P``
`
end

^ permalink raw reply	[flat|nested] 5+ messages in thread
[parent not found: <9712121305.AA19929@vlsi1.ultra.nyu.edu>]
[parent not found: <19308.881955381@hurl.cygnus.com>]
end of thread, other threads:[~1997-12-12 15:46 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
1997-12-12  3:55 the dynamic linker bug Ulrich Drepper
1997-12-12  1:52 ` H.J. Lu
     [not found] <9712121305.AA19929@vlsi1.ultra.nyu.edu>
1997-12-12 14:32 ` Ulrich Drepper
1997-12-12 15:46   ` H.J. Lu
     [not found] <19308.881955381@hurl.cygnus.com>
1997-12-12 15:46 ` H.J. Lu

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