[Bug 34813] winedbg crash reports are missing important information on Mac OS X 10.8+

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=34813

--- Comment #1 from Ken Thomases <ken at codeweavers.com> 2013-10-28 20:48:54 CDT ---
The problem is Address Space Layout Randomization (ASLR).  Dyld is being loaded
into a random address in the process, which invalidates an assumption made in
dlls/dbghelp/macho_module.c:macho_load_file().  That assumes that the address
of the symbol "_dyld_all_image_infos" in /usr/lib/dyld is where the dynamic
loader image info will be found in all processes.

In the presence of ASLR, it's difficult to find where that dyld info really is.

The only viable approach I've found is to use Mach's task_info() function with
the TASK_DYLD_INFO flavor.  This requires that the caller have the debuggee's
Mach task port name.  A task can obtain its own task port name, but to obtain
the task port name of another task requires privileges.  Wine processes do send
their task port to the wineserver at startup, though.  So, it would be possible
for the debugger to request that the wineserver obtain the debuggee's dyld info
and return it.

(The TASK_DYLD_INFO flavor isn't declared in the 10.5 SDK, so we may need to
keep the existing approach as a fallback until we abandon support for 10.5.)

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