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    Contents of /trunk/gdb/patches/gdb-6.7.1-dwarf-stack-overflow.patch

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    Revision 557 - (show annotations) (download)
    Mon Mar 31 11:07:22 2008 UTC (16 years, 1 month ago) by niro
    File size: 1739 byte(s) 
    -re-diff
    1 http://bugs.gentoo.org/144833
    2
    3 for gdb/ChangeLog:
    4 2006-08-22 Will Drewry <wad@google.com>
    5 Tavis Ormandy <taviso@google.com>
    6
    7 * dwarf2read.c (decode_locdesc): Enforce location description stack
    8 boundaries.
    9 * dwarfread.c (locval): Likewise.
    10
    11 Index: gdb-6.5/gdb/dwarf2read.c
    12 ===================================================================
    13 --- gdb-6.5.orig/gdb/dwarf2read.c 2006-09-04 02:02:23.000000000 -0300
    14 +++ gdb-6.5/gdb/dwarf2read.c 2006-09-04 02:02:23.000000000 -0300
    15 @@ -8667,8 +8667,7 @@ dwarf2_fundamental_type (struct objfile
    16 callers will only want a very basic result and this can become a
    17 complaint.
    18
    19 - Note that stack[0] is unused except as a default error return.
    20 - Note that stack overflow is not yet handled. */
    21 + Note that stack[0] is unused except as a default error return. */
    22
    23 static CORE_ADDR
    24 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
    25 @@ -8685,7 +8684,7 @@ decode_locdesc (struct dwarf_block *blk,
    26
    27 i = 0;
    28 stacki = 0;
    29 - stack[stacki] = 0;
    30 + stack[++stacki] = 0;
    31
    32 while (i < size)
    33 {
    34 @@ -8864,6 +8863,16 @@ decode_locdesc (struct dwarf_block *blk,
    35 dwarf_stack_op_name (op));
    36 return (stack[stacki]);
    37 }
    38 + /* Enforce maximum stack depth of size-1 to avoid ++stacki writing
    39 + outside of the allocated space. Also enforce minimum > 0.
    40 + -- wad@google.com 14 Aug 2006 */
    41 + if (stacki >= sizeof (stack) / sizeof (*stack) - 1)
    42 + internal_error (__FILE__, __LINE__,
    43 + _("location description stack too deep: %d"),
    44 + stacki);
    45 + if (stacki <= 0)
    46 + internal_error (__FILE__, __LINE__,
    47 + _("location description stack too shallow"));
    48 }
    49 return (stack[stacki]);
    50 }