patches/gdb/6.8a/100-dwarf-stack-overflow.patch
author "Yann E. MORIN" <yann.morin.1998@free.fr>
Tue Jul 31 22:27:29 2012 +0200 (2012-07-31)
changeset 3018 7776e8369284
parent 746 b150d6f590fc
permissions -rw-r--r--
complibs/cloog: create missing m4 dir

Because we now patch configure.in and configure, the Makefile quicks
in a re-build rule as the source files are now more recent than the
bundled generated files, and that fails because the m4 directory
is missing, although on some systems where aclocal is not installed,
the re-build rule does nothing (except a warning).

Always create tht directory.

Reported-by: Per Arnold Blaasmo <per-arnold.blaasmo@atmel.com>
[Also thanks to Thomas De Schampheleire <patrickdepinguin@gmail.com>
for some digging works on this issue]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
     1 Original patch from gentoo: gentoo/src/patchsets/gdb/6.8/80_all_gdb-6.5-dwarf-stack-overflow.patch
     2 -= BEGIN original header =-
     3 http://bugs.gentoo.org/144833
     4 
     5 for gdb/ChangeLog:
     6 2006-08-22  Will Drewry <wad@google.com>
     7 	    Tavis Ormandy <taviso@google.com>
     8 
     9 	* dwarf2read.c (decode_locdesc): Enforce location description stack
    10 	boundaries.
    11 	* dwarfread.c (locval): Likewise.
    12 
    13 -= END original header =-
    14 diff -durN gdb-6.8.orig/gdb/dwarf2read.c gdb-6.8/gdb/dwarf2read.c
    15 --- gdb-6.8.orig/gdb/dwarf2read.c	2008-03-10 15:18:10.000000000 +0100
    16 +++ gdb-6.8/gdb/dwarf2read.c	2008-06-17 16:07:31.000000000 +0200
    17 @@ -9124,8 +9124,7 @@
    18     callers will only want a very basic result and this can become a
    19     complaint.
    20  
    21 -   Note that stack[0] is unused except as a default error return.
    22 -   Note that stack overflow is not yet handled.  */
    23 +   Note that stack[0] is unused except as a default error return. */
    24  
    25  static CORE_ADDR
    26  decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
    27 @@ -9142,7 +9141,7 @@
    28  
    29    i = 0;
    30    stacki = 0;
    31 -  stack[stacki] = 0;
    32 +  stack[++stacki] = 0;
    33  
    34    while (i < size)
    35      {
    36 @@ -9324,6 +9323,16 @@
    37  		     dwarf_stack_op_name (op));
    38  	  return (stack[stacki]);
    39  	}
    40 +      /* Enforce maximum stack depth of size-1 to avoid ++stacki writing
    41 +         outside of the allocated space. Also enforce minimum > 0.
    42 +         -- wad@google.com 14 Aug 2006 */
    43 +      if (stacki >= sizeof (stack) / sizeof (*stack) - 1)
    44 +	internal_error (__FILE__, __LINE__,
    45 +	                _("location description stack too deep: %d"),
    46 +	                stacki);
    47 +      if (stacki <= 0)
    48 +	internal_error (__FILE__, __LINE__,
    49 +	                _("location description stack too shallow"));
    50      }
    51    return (stack[stacki]);
    52  }