[Patch] Deimpersonate while accessing HKLM

["Pierre A. Humblet" <pierre at phumblet dot no-ip dot org>]

This patch should fix the chdir problem reported by Jason Tishler.
It deimpersonates while reading the mounts and cygdrive in HKLM.

For ease of initialization, the unused cygheap->user tokens are
now set to NO_IMPERSONATION (instead of INVALID_HANDLE_VALUE), 
which is #defined as NULL.
If the argument of cygwin_set_impersonation_token() is
INVALID_HANDLE_VALUE, it is changed to NO_IMPERSONATION.

Pierre

2004-10-28  Pierre Humblet <pierre.humblet@ieee.org>

	* path.cc (mount_info::from_registry): Deimpersonate while
	accessing HKLM.
	(mount_info::read_cygdrive_info_from_registry): Ditto.
	* cygheap.h: Define NO_IMPERSONATION.
	(cygheap_user::issetuid): Replace INVALID_HANDLE_VALUE by 
	NO_IMPERSONATION.
	(cygheap_user::has_impersonation_tokens): Ditto.
	(cygheap_user::close_impersonation_tokens): Ditto.
	* uinfo.cc (uinfo_init): Ditto.
	* syscalls.cc (seteuid32): Ditto.
	* security.cc (set_impersonation_token): Ditto.

Attachment: imperson.diff
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