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newlib/winsup/cygwin/wincap.cc
Corinna Vinschen 48511f3d38 Overwite potentially faked kernel version with correct values 
* ntdll.h (RtlGetNtVersionNumbers): Declare.
	* wincap.cc (wincapc::init): Overwrite kernel version info
	returned by RtlGetVersion with correct info returnd by
	RtlGetNtVersionNumbers.  Add comment.

Originally, using RtlGetVersion instead of GetVersionEx was supposed to
fix the fact that GetVersionInfo returns the wrong kernel version if the
executable has been built with an old manifest (or none at all), starting
with Windows 8.1.  Either this never really worked as desired and our
testing was flawed, or this has been changed again with Windows 10, so
that RtlGetVersion does the kernel faking twist as well.  Since we're
only reading the value in the first process in a process tree. the entire
process tree is running with a wrong OS version information in that case.

Fortunately, the (undocumented) RtlGetNtVersionNumbers function is not
affected by this nonsense, so we simply override the OS version info
fields with the correct values now.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2016-03-09 23:10:17 +01:00

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/* wincap.cc -- figure out on which OS we're running. Set the
capability class to the appropriate values.
Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
2012, 2013, 2014, 2015 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "security.h"
#include "ntdll.h"
/* CV, 2008-10-23: All wincapc's have to be in the .cygwin_dll_common section,
same as wincap itself. Otherwise the capability changes made in
wincapc::init() are not propagated to any subsequently started process
in the same session. I'm only writing this longish comment because I'm
puzzled that this has never been noticed before... */
wincaps wincap_xpsp2 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_GLOBAL_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:false,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:false,
has_gaa_on_link_prefix:false,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:false,
has_restricted_stack_args:false,
has_transactions:false,
has_sendmsg:false,
has_broken_udf:true,
has_broken_alloc_console:false,
has_always_all_codepages:false,
has_localenames:false,
has_fast_cwd:false,
has_restricted_raw_disk_access:false,
use_dont_resolve_hack:true,
has_console_logon_sid:false,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:false,
has_pipe_reject_remote_clients:false,
terminate_thread_frees_stack:false,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:false,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:false,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
has_broken_whoami:true,
};
wincaps wincap_2003 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_GLOBAL_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:false,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:false,
has_gaa_on_link_prefix:false,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:false,
has_restricted_stack_args:true,
has_transactions:false,
has_sendmsg:false,
has_broken_udf:true,
has_broken_alloc_console:false,
has_always_all_codepages:false,
has_localenames:false,
has_fast_cwd:false,
has_restricted_raw_disk_access:false,
use_dont_resolve_hack:true,
has_console_logon_sid:false,
wow64_has_secondary_stack:true,
has_program_compatibility_assistant:false,
has_pipe_reject_remote_clients:false,
terminate_thread_frees_stack:false,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:true,
has_processor_groups:false,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
has_broken_whoami:true,
};
wincaps wincap_vista __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:true,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:true,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:false,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:false,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:false,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
has_broken_whoami:true,
};
wincaps wincap_7 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:1,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:true,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:false,
has_microsoft_accounts:false,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
has_broken_whoami:true,
};
wincaps wincap_8 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:2,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:true,
has_microsoft_accounts:true,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:false,
has_new_pebteb_region:false,
has_broken_whoami:false,
};
wincaps wincap_10 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:2,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:true,
has_microsoft_accounts:true,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:true,
has_new_pebteb_region:false,
has_broken_whoami:false,
};
wincaps wincap_10_1511 __attribute__((section (".cygwin_dll_common"), shared)) = {
def_guard_pages:2,
max_sys_priv:SE_CREATE_SYMBOLIC_LINK_PRIVILEGE,
is_server:false,
has_mandatory_integrity_control:true,
needs_count_in_si_lpres2:false,
has_recycle_dot_bin:true,
has_gaa_on_link_prefix:true,
has_gaa_largeaddress_bug:false,
supports_all_posix_ai_flags:true,
has_restricted_stack_args:false,
has_transactions:true,
has_sendmsg:true,
has_broken_udf:false,
has_broken_alloc_console:true,
has_always_all_codepages:true,
has_localenames:true,
has_fast_cwd:true,
has_restricted_raw_disk_access:true,
use_dont_resolve_hack:false,
has_console_logon_sid:true,
wow64_has_secondary_stack:false,
has_program_compatibility_assistant:true,
has_pipe_reject_remote_clients:true,
terminate_thread_frees_stack:true,
has_precise_system_time:true,
has_microsoft_accounts:true,
has_set_thread_stack_guarantee:true,
has_broken_rtl_query_process_debug_information:false,
has_processor_groups:true,
has_broken_prefetchvm:false,
has_new_pebteb_region:true,
has_broken_whoami:false,
};
wincapc wincap __attribute__((section (".cygwin_dll_common"), shared));
void
wincapc::init ()
{
if (caps)
return; // already initialized
GetSystemInfo (&system_info);
version.dwOSVersionInfoSize = sizeof (RTL_OSVERSIONINFOEXW);
RtlGetVersion (&version);
/* Overwrite unreliable kernel version with correct values returned by
RtlGetNtVersionNumbers. See git log of this change for a description. */
RtlGetNtVersionNumbers (&version.dwMajorVersion,
&version.dwMinorVersion,
&version.dwBuildNumber);
switch (version.dwMajorVersion)
{
case 5:
switch (version.dwMinorVersion)
{
case 1:
caps = &wincap_xpsp2;
break;
default:
caps = &wincap_2003;
}
break;
case 6:
switch (version.dwMinorVersion)
{
case 0:
caps = &wincap_vista;
break;
case 1:
caps = &wincap_7;
break;
case 2:
case 3:
caps = &wincap_8;
break;
default:
caps = &wincap_10;
break;
}
break;
case 10:
default:
if (version.dwBuildNumber >= 10586)
caps = &wincap_10_1511;
else
caps = &wincap_10;
break;
}
((wincaps *)caps)->is_server = (version.wProductType != VER_NT_WORKSTATION);
#ifdef __x86_64__
wow64 = 0;
/* 64 bit systems have one more guard page than their 32 bit counterpart. */
++((wincaps *)caps)->def_guard_pages;
#else
/* RtlQueryProcessDebugInformation/CreateToolhelp32Snapshot both crash the
target process on 64 bit XP/2003 in native 64 bit mode only. Reset the
flag here for 32 bit. */
((wincaps *)caps)->has_broken_rtl_query_process_debug_information = false;
/* Windows 10 1511 has a stack move when a 64 bit process is started from
a 32 bit process, just as it was vice versa in XP/2003. Reset the flag
here for 32 bit. */
if (NT_SUCCESS (NtQueryInformationProcess (NtCurrentProcess (),
ProcessWow64Information,
&wow64, sizeof wow64, NULL))
&& !wow64)
#endif
{
((wincaps *)caps)->needs_count_in_si_lpres2 = false;
((wincaps *)caps)->has_restricted_stack_args = false;
((wincaps *)caps)->wow64_has_secondary_stack = false;
((wincaps *)caps)->has_gaa_largeaddress_bug = false;
((wincaps *)caps)->has_broken_prefetchvm = false;
}
__small_sprintf (osnam, "NT-%d.%d", version.dwMajorVersion,
version.dwMinorVersion);
}
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