yann@570: Original patch from gentoo: gentoo/src/patchsets/gdb/6.8/80_all_gdb-6.5-dwarf-stack-overflow.patch
yann@570: -= BEGIN original header =-
yann@570: http://bugs.gentoo.org/144833
yann@570: 
yann@570: for gdb/ChangeLog:
yann@570: 2006-08-22  Will Drewry <wad@google.com>
yann@570: 	    Tavis Ormandy <taviso@google.com>
yann@570: 
yann@570: 	* dwarf2read.c (decode_locdesc): Enforce location description stack
yann@570: 	boundaries.
yann@570: 	* dwarfread.c (locval): Likewise.
yann@570: 
yann@570: -= END original header =-
yann@570: diff -durN gdb-6.8.orig/gdb/dwarf2read.c gdb-6.8/gdb/dwarf2read.c
yann@570: --- gdb-6.8.orig/gdb/dwarf2read.c	2008-03-10 15:18:10.000000000 +0100
yann@570: +++ gdb-6.8/gdb/dwarf2read.c	2008-06-17 16:07:31.000000000 +0200
yann@570: @@ -9124,8 +9124,7 @@
yann@570:     callers will only want a very basic result and this can become a
yann@570:     complaint.
yann@570:  
yann@570: -   Note that stack[0] is unused except as a default error return.
yann@570: -   Note that stack overflow is not yet handled.  */
yann@570: +   Note that stack[0] is unused except as a default error return. */
yann@570:  
yann@570:  static CORE_ADDR
yann@570:  decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
yann@570: @@ -9142,7 +9141,7 @@
yann@570:  
yann@570:    i = 0;
yann@570:    stacki = 0;
yann@570: -  stack[stacki] = 0;
yann@570: +  stack[++stacki] = 0;
yann@570:  
yann@570:    while (i < size)
yann@570:      {
yann@570: @@ -9324,6 +9323,16 @@
yann@570:  		     dwarf_stack_op_name (op));
yann@570:  	  return (stack[stacki]);
yann@570:  	}
yann@570: +      /* Enforce maximum stack depth of size-1 to avoid ++stacki writing
yann@570: +         outside of the allocated space. Also enforce minimum > 0.
yann@570: +         -- wad@google.com 14 Aug 2006 */
yann@570: +      if (stacki >= sizeof (stack) / sizeof (*stack) - 1)
yann@570: +	internal_error (__FILE__, __LINE__,
yann@570: +	                _("location description stack too deep: %d"),
yann@570: +	                stacki);
yann@570: +      if (stacki <= 0)
yann@570: +	internal_error (__FILE__, __LINE__,
yann@570: +	                _("location description stack too shallow"));
yann@570:      }
yann@570:    return (stack[stacki]);
yann@570:  }