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patches/gdb/6.8/100-dwarf-stack-overflow.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Jan 17 23:06:02 2010 +0100 (2010-01-17)
changeset 1740 c57458bb354d
parent 570 301eb285ae7d
permissions -rw-r--r--
configure: do not require hg when configuring in an hg clone

When configuring in an hg clone, we need hg to compute the version string.
It can happen that users do not have Mercurial (eg. if they got a snapshot
rather that they did a full clone). In this case, we can still run, of
course, so simply fill the version string with a sufficiently explicit
value, that does not require hg. The date is a good candidate. 
     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  }
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