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2010-11-19 Will Drewry <wad@google.com>

Browse Source 
Tavis Ormandy  <taviso@google.com>
	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	* dwarf2read.c (decode_locdesc): Enforce location description stack
	boundaries.
This commit is contained in:
Tom Tromey 2010-11-19 16:35:13 +00:00
parent 42a851a999
commit d53d4ac5aa
2 changed files with 25 additions and 2 deletions
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7
gdb/ChangeLog
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@ -1,3 +1,10 @@
2010-11-19 Will Drewry <wad@google.com>
Tavis Ormandy <taviso@google.com>
Jan Kratochvil <jan.kratochvil@redhat.com>
* dwarf2read.c (decode_locdesc): Enforce location description stack
boundaries.
2010-11-18 Pierre Muller <muller@ics.u-strasbg.fr>
* arm-tdep.c (arm_in_function_epilogue_p): Fix code when "MOV SP"

20
gdb/dwarf2read.c
View File

@ -13279,8 +13279,7 @@ read_signatured_type (struct objfile *objfile,
callers will only want a very basic result and this can become a
complaint.
Note that stack[0] is unused except as a default error return.
Note that stack overflow is not yet handled. */
Note that stack[0] is unused except as a default error return. */
static CORE_ADDR
decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
@ -13297,6 +13296,7 @@ decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
i = 0;
stacki = 0;
stack[stacki] = 0;
stack[++stacki] = 0;
while (i < size)
{
@ -13478,6 +13478,22 @@ decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
dwarf_stack_op_name (op, 1));
return (stack[stacki]);
}
/* Enforce maximum stack depth of SIZE-1 to avoid writing
outside of the allocated space. Also enforce minimum>0. */
if (stacki >= ARRAY_SIZE (stack) - 1)
{
complaint (&symfile_complaints,
_("location description stack overflow"));
return 0;
}
if (stacki <= 0)
{
complaint (&symfile_complaints,
_("location description stack underflow"));
return 0;
}
}
return (stack[stacki]);
}