*
* Copyright (c) 2004 Alexander Stock <stock.alexander@gmx.de>
* Copyright (c) 2006 Martin Mares <mj@ucw.cz>
+ * Copyright (c) 2021 Pali Rohár <pali@kernel.org>
*
- * Can be freely distributed and used under the terms of the GNU GPL.
+ * Can be freely distributed and used under the terms of the GNU GPL v2+
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <io.h>
#include <windows.h>
+#include <aclapi.h>
-#ifndef __GNUC__
+#ifdef _MSC_VER
+/* MSVC compiler provides I/O port intrinsics for both 32 and 64-bit modes. */
+#pragma intrinsic(_outp)
+#pragma intrinsic(_outpw)
+#pragma intrinsic(_outpd)
+#pragma intrinsic(_inp)
+#pragma intrinsic(_inpw)
+#pragma intrinsic(_inpd)
+#elif defined(_WIN64) || defined(_UCRT)
+/*
+ * For other compilers I/O port intrinsics are available in <intrin.h> header
+ * file either as inline/external functions or macros. Beware that <intrin.h>
+ * names are different than MSVC intrinsics names and glibc function names.
+ * Usage of <intrin.h> is also the prefered way for 64-bit mode or when using
+ * new UCRT library.
+ */
+#include <intrin.h>
+#define _outp(x,y) __outbyte(x,y)
+#define _outpw(x,y) __outword(x,y)
+#define _outpd(x,y) __outdword(x,y)
+#define _inp(x) __inbyte(x)
+#define _inpw(x) __inword(x)
+#define _inpd(x) __indword(x)
+#elif defined(__CRTDLL__) || (defined(__MSVCRT_VERSION__) && __MSVCRT_VERSION__ < 0x400)
+/*
+ * Old 32-bit CRTDLL library and pre-4.00 MSVCRT library do not provide I/O
+ * port functions. As these libraries exist only in 32-bit mode variant,
+ * implement I/O port functions via 32-bit inline assembly.
+ */
+static inline int _outp(unsigned short port, int databyte)
+{
+ asm volatile ("outb %b0, %w1" : : "a" (databyte), "Nd" (port));
+ return databyte;
+}
+static inline unsigned short _outpw(unsigned short port, unsigned short dataword)
+{
+ asm volatile ("outw %w0, %w1" : : "a" (dataword), "Nd" (port));
+ return dataword;
+}
+static inline unsigned long _outpd(unsigned short port, unsigned long dataword)
+{
+ asm volatile ("outl %0, %w1" : : "a" (dataword), "Nd" (port));
+ return dataword;
+}
+static inline int _inp(unsigned short port)
+{
+ unsigned char ret;
+ asm volatile ("inb %w1, %0" : "=a" (ret) : "Nd" (port));
+ return ret;
+}
+static inline unsigned short _inpw(unsigned short port)
+{
+ unsigned short ret;
+ asm volatile ("inw %w1, %0" : "=a" (ret) : "Nd" (port));
+ return ret;
+}
+static inline unsigned long _inpd(unsigned short port)
+{
+ unsigned long ret;
+ asm volatile ("inl %w1, %0" : "=a" (ret) : "Nd" (port));
+ return ret;
+}
+#elif !defined(__GNUC__)
+/*
+ * Old 32-bit MSVCRT (non-UCRT) library provides I/O port functions. Function
+ * prototypes are defined in <conio.h> header file but they are missing in
+ * some MinGW toolchains. So for GCC compiler define them manually.
+ */
#include <conio.h>
#else
int _outp(unsigned short port, int databyte);
#define inw(x) _inpw(x)
#define inl(x) _inpd(x)
+/*
+ * Define __readeflags() for MSVC and GCC compilers.
+ * MSVC since version 14.00 included in WDK 6001 and since version 15.00
+ * included in VS 2008 provides __readeflags() intrinsic for both 32 and 64-bit
+ * modes. WDK 6001 defines macro __BUILDMACHINE__ to value WinDDK. VS 2008 does
+ * not define this macro at all. MSVC throws error if name of user defined
+ * function conflicts with some MSVC intrinsic.
+ * MSVC supports inline assembly via __asm keyword in 32-bit mode only.
+ * GCC version 4.9.0 and higher provides __builtin_ia32_readeflags_uXX()
+ * builtin for XX-mode. This builtin is also available as __readeflags()
+ * function indirectly via <x86intrin.h> header file.
+ */
+#if defined(_MSC_VER) && (_MSC_VER >= 1500 || (_MSC_VER >= 1400 && defined(__BUILDMACHINE__)))
+#pragma intrinsic(__readeflags)
+#elif defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 9) || (__GNUC__ > 4))
+#include <x86intrin.h>
+#elif defined(_MSC_VER) && defined(_M_IX86)
+static inline unsigned int
+__readeflags(void)
+{
+ __asm pushfd;
+ __asm pop eax;
+}
+#elif defined(__GNUC__)
+static inline unsigned
+#ifdef __x86_64__
+long long
+#endif
+int
+__readeflags(void)
+{
+ unsigned
+#ifdef __x86_64__
+ long long
+#endif
+ int eflags;
+ asm volatile ("pushf\n\tpop %0\n" : "=r" (eflags));
+ return eflags;
+}
+#else
+#error "Unsupported compiler"
+#endif
+
+/* Read IOPL of the current process, IOPL is stored in eflag bits [13:12]. */
+#define read_iopl() ((__readeflags() >> 12) & 0x3)
+
+/* Unfortunately i586-mingw32msvc toolchain does not provide this constant. */
+#ifndef PROCESS_QUERY_LIMITED_INFORMATION
+#define PROCESS_QUERY_LIMITED_INFORMATION 0x1000
+#endif
+
+/* Unfortunately some toolchains do not provide this constant. */
+#ifndef SE_IMPERSONATE_NAME
+#define SE_IMPERSONATE_NAME TEXT("SeImpersonatePrivilege")
+#endif
+
+/*
+ * These psapi functions are available in kernel32.dll library with K32 prefix
+ * on Windows 7 and higher systems. On older Windows systems these functions are
+ * available in psapi.dll libary without K32 prefix. So resolve pointers to
+ * these functions dynamically at runtime from the available system library.
+ * Function GetProcessImageFileNameW() is not available on Windows 2000 and
+ * older systems.
+ */
+typedef BOOL (WINAPI *EnumProcessesProt)(DWORD *lpidProcess, DWORD cb, DWORD *cbNeeded);
+typedef DWORD (WINAPI *GetProcessImageFileNameWProt)(HANDLE hProcess, LPWSTR lpImageFileName, DWORD nSize);
+typedef DWORD (WINAPI *GetModuleFileNameExWProt)(HANDLE hProcess, HMODULE hModule, LPWSTR lpImageFileName, DWORD nSize);
+
+/*
+ * These aclapi functions are available in advapi.dll library on Windows NT 4.0
+ * and higher systems.
+ */
+typedef DWORD (WINAPI *GetSecurityInfoProt)(HANDLE handle, SE_OBJECT_TYPE ObjectType, SECURITY_INFORMATION SecurityInfo, PSID *ppsidOwner, PSID *ppsidGroup, PACL *ppDacl, PACL *ppSacl, PSECURITY_DESCRIPTOR *ppSecurityDescriptor);
+typedef DWORD (WINAPI *SetSecurityInfoProt)(HANDLE handle, SE_OBJECT_TYPE ObjectType, SECURITY_INFORMATION SecurityInfo, PSID psidOwner, PSID psidGroup, PACL pDacl, PACL pSacl);
+typedef DWORD (WINAPI *SetEntriesInAclProt)(ULONG cCountOfExplicitEntries, PEXPLICIT_ACCESS pListOfExplicitEntries, PACL OldAcl, PACL *NewAcl);
+
+/*
+ * This errhandlingapi function is available in kernel32.dll library on
+ * Windows 7 and higher systems.
+ */
+typedef BOOL (WINAPI *SetThreadErrorModeProt)(DWORD dwNewMode, LPDWORD lpOldMode);
+
+/*
+ * Unfortunately NtSetInformationProcess() function, ProcessUserModeIOPL
+ * constant and all other helpers for its usage are not specified in any
+ * standard WinAPI header file. So define all of required constants and types.
+ * Function NtSetInformationProcess() is available in ntdll.dll library on all
+ * Windows systems but marked as it can be removed in some future version.
+ */
+#ifndef NTSTATUS
+#define NTSTATUS LONG
+#endif
+#ifndef STATUS_NOT_IMPLEMENTED
+#define STATUS_NOT_IMPLEMENTED (NTSTATUS)0xC0000002
+#endif
+#ifndef STATUS_PRIVILEGE_NOT_HELD
+#define STATUS_PRIVILEGE_NOT_HELD (NTSTATUS)0xC0000061
+#endif
+#ifndef PROCESSINFOCLASS
+#define PROCESSINFOCLASS DWORD
+#endif
+#ifndef ProcessUserModeIOPL
+#define ProcessUserModeIOPL 16
+#endif
+typedef NTSTATUS (NTAPI *NtSetInformationProcessProt)(HANDLE ProcessHandle, PROCESSINFOCLASS ProcessInformationClass, PVOID ProcessInformation, ULONG ProcessInformationLength);
+
+/*
+ * Check if the current thread has particular privilege in current active access
+ * token. Case when it not possible to determinate it (e.g. current thread does
+ * not have permission to open its own current active access token) is evaluated
+ * as thread does not have that privilege.
+ */
+static BOOL
+have_privilege(LUID luid_privilege)
+{
+ PRIVILEGE_SET priv;
+ HANDLE token;
+ BOOL ret;
+
+ /*
+ * If the current thread does not have active access token then thread
+ * uses primary process access token for all permission checks.
+ */
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &token) &&
+ (GetLastError() != ERROR_NO_TOKEN ||
+ !OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token)))
+ return FALSE;
+
+ priv.PrivilegeCount = 1;
+ priv.Control = PRIVILEGE_SET_ALL_NECESSARY;
+ priv.Privilege[0].Luid = luid_privilege;
+ priv.Privilege[0].Attributes = SE_PRIVILEGE_ENABLED;
+
+ if (!PrivilegeCheck(token, &priv, &ret))
+ return FALSE;
+
+ return ret;
+}
+
+/*
+ * Enable or disable particular privilege in specified access token.
+ *
+ * Note that it is not possible to disable privilege in access token with
+ * SE_PRIVILEGE_ENABLED_BY_DEFAULT attribute. This function does not check
+ * this case and incorrectly returns no error even when disabling failed.
+ * Rationale for this decision: Simplification of this function as WinAPI
+ * call AdjustTokenPrivileges() does not signal error in this case too.
+ */
+static BOOL
+set_privilege(HANDLE token, LUID luid_privilege, BOOL enable)
+{
+ TOKEN_PRIVILEGES token_privileges;
+
+ token_privileges.PrivilegeCount = 1;
+ token_privileges.Privileges[0].Luid = luid_privilege;
+ token_privileges.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;
+
+ /*
+ * WinAPI function AdjustTokenPrivileges() success also when not all
+ * privileges were enabled. It is always required to check for failure
+ * via GetLastError() call. AdjustTokenPrivileges() always sets error
+ * also when it success, as opposite to other WinAPI functions.
+ */
+ if (!AdjustTokenPrivileges(token, FALSE, &token_privileges, sizeof(token_privileges), NULL, NULL) ||
+ GetLastError() != ERROR_SUCCESS)
+ return FALSE;
+
+ return TRUE;
+}
+
+/*
+ * Change access token for the current thread to new specified access token.
+ * Previously active access token is stored in old_token variable and can be
+ * used for reverting to this access token. It is set to NULL if the current
+ * thread previously used primary process access token.
+ */
+static BOOL
+change_token(HANDLE new_token, HANDLE *old_token)
+{
+ HANDLE token;
+
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &token))
+ {
+ if (GetLastError() != ERROR_NO_TOKEN)
+ return FALSE;
+ token = NULL;
+ }
+
+ if (!ImpersonateLoggedOnUser(new_token))
+ {
+ if (token)
+ CloseHandle(token);
+ return FALSE;
+ }
+
+ *old_token = token;
+ return TRUE;
+}
+
+/*
+ * Change access token for the current thread to the primary process access
+ * token. This function fails also when the current thread already uses primary
+ * process access token.
+ */
+static BOOL
+change_token_to_primary(HANDLE *old_token)
+{
+ HANDLE token;
+
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &token))
+ return FALSE;
+
+ RevertToSelf();
+
+ *old_token = token;
+ return TRUE;
+}
+
+/*
+ * Revert to the specified access token for the current thread. When access
+ * token is specified as NULL then revert to the primary process access token.
+ * Use to revert after change_token() or change_token_to_primary() call.
+ */
+static VOID
+revert_to_token(HANDLE token)
+{
+ /*
+ * If SetThreadToken() call fails then there is no option to revert to
+ * the specified previous thread access token. So in this case revert to
+ * the primary process access token.
+ */
+ if (!token || !SetThreadToken(NULL, token))
+ RevertToSelf();
+ if (token)
+ CloseHandle(token);
+}
+
+/*
+ * Enable particular privilege for the current thread. And set method how to
+ * revert this privilege (if to revert whole token or only privilege).
+ */
+static BOOL
+enable_privilege(LUID luid_privilege, HANDLE *revert_token, BOOL *revert_only_privilege)
+{
+ HANDLE thread_token;
+ HANDLE new_token;
+
+ if (OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, TRUE, &thread_token))
+ {
+ if (set_privilege(thread_token, luid_privilege, TRUE))
+ {
+ /*
+ * Indicate that correct revert method is just to
+ * disable privilege in access token.
+ */
+ if (revert_token && revert_only_privilege)
+ {
+ *revert_token = thread_token;
+ *revert_only_privilege = TRUE;
+ }
+ else
+ {
+ CloseHandle(thread_token);
+ }
+ return TRUE;
+ }
+ CloseHandle(thread_token);
+ /*
+ * If enabling privilege failed then try to enable it via
+ * primary process access token.
+ */
+ }
+
+ /*
+ * If the current thread has already active thread access token then
+ * open it with just impersonate right as it would be used only for
+ * future revert.
+ */
+ if (revert_token && revert_only_privilege)
+ {
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_IMPERSONATE, TRUE, &thread_token))
+ {
+ if (GetLastError() != ERROR_NO_TOKEN)
+ return FALSE;
+ thread_token = NULL;
+ }
+
+ /*
+ * If current thread has no access token (and uses primary
+ * process access token) or it does not have permission to
+ * adjust privileges or it does not have specified privilege
+ * then create a copy of the primary process access token,
+ * assign it for the current thread (= impersonate self)
+ * and then try adjusting privilege again.
+ */
+ if (!ImpersonateSelf(SecurityImpersonation))
+ {
+ if (thread_token)
+ CloseHandle(thread_token);
+ return FALSE;
+ }
+ }
+
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_ADJUST_PRIVILEGES, TRUE, &new_token))
+ {
+ /* thread_token is set only when we were asked for revert method. */
+ if (revert_token && revert_only_privilege)
+ revert_to_token(thread_token);
+ return FALSE;
+ }
+
+ if (!set_privilege(new_token, luid_privilege, TRUE))
+ {
+ CloseHandle(new_token);
+ /* thread_token is set only when we were asked for revert method. */
+ if (revert_token && revert_only_privilege)
+ revert_to_token(thread_token);
+ return FALSE;
+ }
+
+ /*
+ * Indicate that correct revert method is to change to the previous
+ * access token. Either to the primary process access token or to the
+ * previous thread access token.
+ */
+ if (revert_token && revert_only_privilege)
+ {
+ *revert_token = thread_token;
+ *revert_only_privilege = FALSE;
+ }
+ return TRUE;
+}
+
+/*
+ * Revert particular privilege for the current thread was previously enabled by
+ * enable_privilege() call. Either disable privilege in specified access token
+ * or revert to previous access token.
+ */
+static VOID
+revert_privilege(LUID luid_privilege, HANDLE revert_token, BOOL revert_only_privilege)
+{
+ if (revert_only_privilege)
+ {
+ set_privilege(revert_token, luid_privilege, FALSE);
+ CloseHandle(revert_token);
+ }
+ else
+ {
+ revert_to_token(revert_token);
+ }
+}
+
+/*
+ * Return owner of the access token used by the current thread. Buffer for
+ * returned owner needs to be released by LocalFree() call.
+ */
+static TOKEN_OWNER *
+get_current_token_owner(VOID)
+{
+ HANDLE token;
+ DWORD length;
+ TOKEN_OWNER *owner;
+
+ /*
+ * If the current thread does not have active access token then thread
+ * uses primary process access token for all permission checks.
+ */
+ if (!OpenThreadToken(GetCurrentThread(), TOKEN_QUERY, TRUE, &token) &&
+ (GetLastError() != ERROR_NO_TOKEN ||
+ !OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &token)))
+ return NULL;
+
+ if (!GetTokenInformation(token, TokenOwner, NULL, 0, &length) &&
+ GetLastError() != ERROR_INSUFFICIENT_BUFFER)
+ {
+ CloseHandle(token);
+ return NULL;
+ }
+
+retry:
+ owner = (TOKEN_OWNER *)LocalAlloc(LPTR, length);
+ if (!owner)
+ {
+ CloseHandle(token);
+ return NULL;
+ }
+
+ if (!GetTokenInformation(token, TokenOwner, owner, length, &length))
+ {
+ /*
+ * Length of token owner (SID) buffer between two get calls may
+ * changes (e.g. by another thread of process), so retry.
+ */
+ if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
+ {
+ LocalFree(owner);
+ goto retry;
+ }
+ LocalFree(owner);
+ CloseHandle(token);
+ return NULL;
+ }
+
+ CloseHandle(token);
+ return owner;
+}
+
+/*
+ * Grant particular permissions in the primary access token of the specified
+ * process for the owner of current thread token and set old DACL of the
+ * process access token for reverting permissions. Security descriptor is
+ * just memory buffer for old DACL.
+ */
+static BOOL
+grant_process_token_dacl_permissions(HANDLE process, DWORD permissions, HANDLE *token, PACL *old_dacl, PSECURITY_DESCRIPTOR *security_descriptor)
+{
+ GetSecurityInfoProt MyGetSecurityInfo;
+ SetSecurityInfoProt MySetSecurityInfo;
+ SetEntriesInAclProt MySetEntriesInAcl;
+ EXPLICIT_ACCESS explicit_access;
+ TOKEN_OWNER *owner;
+ HMODULE advapi32;
+ PACL new_dacl;
+
+ /*
+ * This source file already uses advapi32.dll library, so it is
+ * linked to executable and automatically loaded when starting
+ * current running process.
+ */
+ advapi32 = GetModuleHandle(TEXT("advapi32.dll"));
+ if (!advapi32)
+ return FALSE;
+
+ /*
+ * It does not matter if SetEntriesInAclA() or SetEntriesInAclW() is
+ * called as no string is passed to SetEntriesInAcl function.
+ */
+ MyGetSecurityInfo = (GetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "GetSecurityInfo");
+ MySetSecurityInfo = (SetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "SetSecurityInfo");
+ MySetEntriesInAcl = (SetEntriesInAclProt)(LPVOID)GetProcAddress(advapi32, "SetEntriesInAclA");
+ if (!MyGetSecurityInfo || !MySetSecurityInfo || !MySetEntriesInAcl)
+ return FALSE;
+
+ owner = get_current_token_owner();
+ if (!owner)
+ return FALSE;
+
+ /*
+ * READ_CONTROL is required for GetSecurityInfo(DACL_SECURITY_INFORMATION)
+ * and WRITE_DAC is required for SetSecurityInfo(DACL_SECURITY_INFORMATION).
+ */
+ if (!OpenProcessToken(process, READ_CONTROL | WRITE_DAC, token))
+ {
+ LocalFree(owner);
+ return FALSE;
+ }
+
+ if (MyGetSecurityInfo(*token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, old_dacl, NULL, security_descriptor) != ERROR_SUCCESS)
+ {
+ LocalFree(owner);
+ CloseHandle(*token);
+ return FALSE;
+ }
+
+ /*
+ * Set new explicit access for the owner of the current thread access
+ * token with non-inherited granting access to specified permissions.
+ */
+ explicit_access.grfAccessPermissions = permissions;
+ explicit_access.grfAccessMode = GRANT_ACCESS;
+ explicit_access.grfInheritance = NO_PROPAGATE_INHERIT_ACE;
+ explicit_access.Trustee.pMultipleTrustee = NULL;
+ explicit_access.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
+ explicit_access.Trustee.TrusteeForm = TRUSTEE_IS_SID;
+ explicit_access.Trustee.TrusteeType = TRUSTEE_IS_USER;
+ /*
+ * Unfortunately i586-mingw32msvc toolchain does not have pSid pointer
+ * member in Trustee union. So assign owner SID to ptstrName pointer
+ * member which aliases with pSid pointer member in the same union.
+ */
+ explicit_access.Trustee.ptstrName = (PVOID)owner->Owner;
+
+ if (MySetEntriesInAcl(1, &explicit_access, *old_dacl, &new_dacl) != ERROR_SUCCESS)
+ {
+ LocalFree(*security_descriptor);
+ LocalFree(owner);
+ CloseHandle(*token);
+ return FALSE;
+ }
+
+ if (MySetSecurityInfo(*token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, new_dacl, NULL) != ERROR_SUCCESS)
+ {
+ LocalFree(*security_descriptor);
+ LocalFree(owner);
+ CloseHandle(*token);
+ return FALSE;
+ }
+
+ LocalFree(owner);
+ return TRUE;
+}
+
+/*
+ * Revert particular granted permissions in specified access token done by
+ * grant_process_token_dacl_permissions() call.
+ */
+static VOID
+revert_token_dacl_permissions(HANDLE token, PACL old_dacl, PSECURITY_DESCRIPTOR security_descriptor)
+{
+ SetSecurityInfoProt MySetSecurityInfo;
+ HMODULE advapi32;
+
+ /*
+ * This source file already uses advapi32.dll library, so it is
+ * linked to executable and automatically loaded when starting
+ * current running process.
+ */
+ advapi32 = GetModuleHandle(TEXT("advapi32.dll"));
+ if (advapi32)
+ {
+ MySetSecurityInfo = (SetSecurityInfoProt)(LPVOID)GetProcAddress(advapi32, "SetSecurityInfo");
+ MySetSecurityInfo(token, SE_KERNEL_OBJECT, DACL_SECURITY_INFORMATION, NULL, NULL, old_dacl, NULL);
+ }
+
+ LocalFree(security_descriptor);
+ CloseHandle(token);
+}
+
+/*
+ * Change error mode of the current thread. If it is not possible then change
+ * error mode of the whole process. Always returns previous error mode.
+ */
+static UINT
+change_error_mode(UINT new_mode)
+{
+ SetThreadErrorModeProt MySetThreadErrorMode = NULL;
+ HMODULE kernel32;
+ DWORD old_mode;
+
+ /*
+ * Function SetThreadErrorMode() was introduced in Windows 7, so use
+ * GetProcAddress() for compatibility with older systems.
+ */
+ kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+ if (kernel32)
+ MySetThreadErrorMode = (SetThreadErrorModeProt)(LPVOID)GetProcAddress(kernel32, "SetThreadErrorMode");
+
+ if (MySetThreadErrorMode &&
+ MySetThreadErrorMode(new_mode, &old_mode))
+ return old_mode;
+
+ /*
+ * Fallback to function SetErrorMode() which modifies error mode of the
+ * whole process and returns old mode.
+ */
+ return SetErrorMode(new_mode);
+}
+
+/*
+ * Open process handle specified by the process id with the query right and
+ * optionally also with vm read right.
+ */
+static HANDLE
+open_process_for_query(DWORD pid, BOOL with_vm_read)
+{
+ BOOL revert_only_privilege;
+ LUID luid_debug_privilege;
+ OSVERSIONINFO version;
+ DWORD process_right;
+ HANDLE revert_token;
+ HANDLE process;
+
+ /*
+ * Some processes on Windows Vista and higher systems can be opened only
+ * with PROCESS_QUERY_LIMITED_INFORMATION right. This right is enough
+ * for accessing primary process token. But this right is not supported
+ * on older pre-Vista systems. When the current thread on these older
+ * systems does not have Debug privilege then OpenProcess() fails with
+ * ERROR_ACCESS_DENIED. If the current thread has Debug privilege then
+ * OpenProcess() success and returns handle to requested process.
+ * Problem is that this handle does not have PROCESS_QUERY_INFORMATION
+ * right and so cannot be used for accessing primary process token
+ * on those older systems. Moreover it has zero rights and therefore
+ * such handle is fully useless. So never try to use open process with
+ * PROCESS_QUERY_LIMITED_INFORMATION right on older systems than
+ * Windows Vista (NT 6.0).
+ */
+ version.dwOSVersionInfoSize = sizeof(version);
+ if (GetVersionEx(&version) &&
+ version.dwPlatformId == VER_PLATFORM_WIN32_NT &&
+ version.dwMajorVersion >= 6)
+ process_right = PROCESS_QUERY_LIMITED_INFORMATION;
+ else
+ process_right = PROCESS_QUERY_INFORMATION;
+
+ if (with_vm_read)
+ process_right |= PROCESS_VM_READ;
+
+ process = OpenProcess(process_right, FALSE, pid);
+ if (process)
+ return process;
+
+ /*
+ * It is possible to open only processes to which owner of the current
+ * thread access token has permissions. For opening other processing it
+ * is required to have Debug privilege enabled. By default local
+ * administrators have this privilege, but it is disabled. So try to
+ * enable it and then try to open process again.
+ */
+
+ if (!LookupPrivilegeValue(NULL, SE_DEBUG_NAME, &luid_debug_privilege))
+ return NULL;
+
+ if (!enable_privilege(luid_debug_privilege, &revert_token, &revert_only_privilege))
+ return NULL;
+
+ process = OpenProcess(process_right, FALSE, pid);
+
+ revert_privilege(luid_debug_privilege, revert_token, revert_only_privilege);
+
+ return process;
+}
+
+/*
+ * Check if process image path name (wide string) matches exe file name
+ * (7-bit ASCII string). Do case-insensitive string comparison. Process
+ * image path name can be in any namespace format (DOS, Win32, UNC, ...).
+ */
+static BOOL
+check_process_name(LPCWSTR path, DWORD path_length, LPCSTR exe_file)
+{
+ DWORD exe_file_length;
+ WCHAR c1;
+ UCHAR c2;
+ DWORD i;
+
+ exe_file_length = 0;
+ while (exe_file[exe_file_length] != '\0')
+ exe_file_length++;
+
+ /* Path must have backslash before exe file name. */
+ if (exe_file_length >= path_length ||
+ path[path_length-exe_file_length-1] != L'\\')
+ return FALSE;
+
+ for (i = 0; i < exe_file_length; i++)
+ {
+ c1 = path[path_length-exe_file_length+i];
+ c2 = exe_file[i];
+ /*
+ * Input string for comparison is 7-bit ASCII and file name part
+ * of path must not contain backslash as it is path separator.
+ */
+ if (c1 >= 0x80 || c2 >= 0x80 || c1 == L'\\')
+ return FALSE;
+ if (c1 >= L'a' && c1 <= L'z')
+ c1 -= L'a' - L'A';
+ if (c2 >= 'a' && c2 <= 'z')
+ c2 -= 'a' - 'A';
+ if (c1 != c2)
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/* Open process handle with the query right specified by process exe file. */
+static HANDLE
+find_and_open_process_for_query(LPCSTR exe_file)
+{
+ GetProcessImageFileNameWProt MyGetProcessImageFileNameW;
+ GetModuleFileNameExWProt MyGetModuleFileNameExW;
+ EnumProcessesProt MyEnumProcesses;
+ HMODULE kernel32, psapi;
+ UINT prev_error_mode;
+ DWORD partial_retry;
+ BOOL found_process;
+ DWORD size, length;
+ DWORD *processes;
+ HANDLE process;
+ LPWSTR path;
+ DWORD error;
+ DWORD count;
+ DWORD i;
+
+ psapi = NULL;
+ kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+ if (!kernel32)
+ return NULL;
+
+ /*
+ * On Windows 7 and higher systems these functions are available in
+ * kernel32.dll library with K32 prefix.
+ */
+ MyGetModuleFileNameExW = NULL;
+ MyGetProcessImageFileNameW = (GetProcessImageFileNameWProt)(LPVOID)GetProcAddress(kernel32, "K32GetProcessImageFileNameW");
+ MyEnumProcesses = (EnumProcessesProt)(LPVOID)GetProcAddress(kernel32, "K32EnumProcesses");
+ if (!MyGetProcessImageFileNameW || !MyEnumProcesses)
+ {
+ /*
+ * On older NT-based systems these functions are available in
+ * psapi.dll library without K32 prefix.
+ */
+ prev_error_mode = change_error_mode(SEM_FAILCRITICALERRORS);
+ psapi = LoadLibrary(TEXT("psapi.dll"));
+ change_error_mode(prev_error_mode);
+
+ if (!psapi)
+ return NULL;
+
+ /*
+ * Function GetProcessImageFileNameW() is available in
+ * Windows XP and higher systems. On older versions is
+ * available function GetModuleFileNameExW().
+ */
+ MyGetProcessImageFileNameW = (GetProcessImageFileNameWProt)(LPVOID)GetProcAddress(psapi, "GetProcessImageFileNameW");
+ MyGetModuleFileNameExW = (GetModuleFileNameExWProt)(LPVOID)GetProcAddress(psapi, "GetModuleFileNameExW");
+ MyEnumProcesses = (EnumProcessesProt)(LPVOID)GetProcAddress(psapi, "EnumProcesses");
+ if ((!MyGetProcessImageFileNameW && !MyGetModuleFileNameExW) || !MyEnumProcesses)
+ {
+ FreeLibrary(psapi);
+ return NULL;
+ }
+ }
+
+ /* Make initial buffer size for 1024 processes. */
+ size = 1024 * sizeof(*processes);
+
+retry:
+ processes = (DWORD *)LocalAlloc(LPTR, size);
+ if (!processes)
+ {
+ if (psapi)
+ FreeLibrary(psapi);
+ return NULL;
+ }
+
+ if (!MyEnumProcesses(processes, size, &length))
+ {
+ LocalFree(processes);
+ if (psapi)
+ FreeLibrary(psapi);
+ return NULL;
+ }
+ else if (size == length)
+ {
+ /*
+ * There is no indication given when the buffer is too small to
+ * store all process identifiers. Therefore if returned length
+ * is same as buffer size there can be more processes. Call
+ * again with larger buffer.
+ */
+ LocalFree(processes);
+ size *= 2;
+ goto retry;
+ }
+
+ process = NULL;
+ count = length / sizeof(*processes);
+
+ for (i = 0; i < count; i++)
+ {
+ /* Skip System Idle Process. */
+ if (processes[i] == 0)
+ continue;
+
+ /*
+ * Function GetModuleFileNameExW() requires additional
+ * PROCESS_VM_READ right as opposite to function
+ * GetProcessImageFileNameW() which does not need it.
+ */
+ process = open_process_for_query(processes[i], MyGetProcessImageFileNameW ? FALSE : TRUE);
+ if (!process)
+ continue;
+
+ /*
+ * Set initial buffer size to 256 (wide) characters.
+ * Final path length on the modern NT-based systems can be also larger.
+ */
+ size = 256;
+ found_process = FALSE;
+ partial_retry = 0;
+
+retry_path:
+ path = (LPWSTR)LocalAlloc(LPTR, size * sizeof(*path));
+ if (!path)
+ goto end_path;
+
+ if (MyGetProcessImageFileNameW)
+ length = MyGetProcessImageFileNameW(process, path, size);
+ else
+ length = MyGetModuleFileNameExW(process, NULL, path, size);
+
+ error = GetLastError();
+
+ /*
+ * GetModuleFileNameEx() returns zero and signal error ERROR_PARTIAL_COPY
+ * when remote process is in the middle of updating its module table.
+ * Sleep 10 ms and try again, max 10 attempts.
+ */
+ if (!MyGetProcessImageFileNameW)
+ {
+ if (length == 0 && error == ERROR_PARTIAL_COPY && partial_retry++ < 10)
+ {
+ Sleep(10);
+ goto retry_path;
+ }
+ partial_retry = 0;
+ }
+
+ /*
+ * When buffer is too small then function GetModuleFileNameEx() returns
+ * its size argument on older systems (Windows XP) or its size minus
+ * argument one on new systems (Windows 10) without signalling any error.
+ * Function GetProcessImageFileNameW() on the other hand returns zero
+ * value and signals error ERROR_INSUFFICIENT_BUFFER. So in all these
+ * cases call function again with larger buffer.
+ */
+
+ if (MyGetProcessImageFileNameW && length == 0 && error != ERROR_INSUFFICIENT_BUFFER)
+ goto end_path;
+
+ if ((MyGetProcessImageFileNameW && length == 0) ||
+ (!MyGetProcessImageFileNameW && (length == size || length == size-1)))
+ {
+ LocalFree(path);
+ size *= 2;
+ goto retry_path;
+ }
+
+ if (length && check_process_name(path, length, exe_file))
+ found_process = TRUE;
+
+end_path:
+ if (path)
+ {
+ LocalFree(path);
+ path = NULL;
+ }
+
+ if (found_process)
+ break;
+
+ CloseHandle(process);
+ process = NULL;
+ }
+
+ LocalFree(processes);
+
+ if (psapi)
+ FreeLibrary(psapi);
+
+ return process;
+}
+
+/*
+ * Try to open primary access token of the particular process with specified
+ * rights. Before opening access token try to adjust DACL permissions of the
+ * primary process access token, so following open does not fail on error
+ * related to no open permissions. Revert DACL permissions after open attempt.
+ * As following steps are not atomic, try to execute them more times in case
+ * of possible race conditions caused by other threads or processes.
+ */
+static HANDLE
+try_grant_permissions_and_open_process_token(HANDLE process, DWORD rights)
+{
+ PSECURITY_DESCRIPTOR security_descriptor;
+ HANDLE grant_token;
+ PACL old_dacl;
+ HANDLE token;
+ DWORD retry;
+ DWORD error;
+
+ /*
+ * This code is not atomic. Between grant and open calls can other
+ * thread or process change or revert permissions. So try to execute
+ * it more times.
+ */
+ for (retry = 0; retry < 10; retry++)
+ {
+ if (!grant_process_token_dacl_permissions(process, rights, &grant_token, &old_dacl, &security_descriptor))
+ return NULL;
+ if (!OpenProcessToken(process, rights, &token))
+ {
+ token = NULL;
+ error = GetLastError();
+ }
+ revert_token_dacl_permissions(grant_token, old_dacl, security_descriptor);
+ if (token)
+ return token;
+ else if (error != ERROR_ACCESS_DENIED)
+ return NULL;
+ }
+
+ return NULL;
+}
+
+/*
+ * Open primary access token of particular process handle with specified rights.
+ * If permissions for specified rights are missing then try to grant them.
+ */
+static HANDLE
+open_process_token_with_rights(HANDLE process, DWORD rights)
+{
+ HANDLE old_token;
+ HANDLE token;
+
+ /* First try to open primary access token of process handle directly. */
+ if (OpenProcessToken(process, rights, &token))
+ return token;
+
+ /*
+ * If opening failed then it means that owner of the current thread
+ * access token does not have permission for it. Try it again with
+ * primary process access token.
+ */
+ if (change_token_to_primary(&old_token))
+ {
+ if (!OpenProcessToken(process, rights, &token))
+ token = NULL;
+ revert_to_token(old_token);
+ if (token)
+ return token;
+ }
+
+ /*
+ * If opening is still failing then try to grant specified permissions
+ * for the current thread and try to open it again.
+ */
+ token = try_grant_permissions_and_open_process_token(process, rights);
+ if (token)
+ return token;
+
+ /*
+ * And if it is still failing then try it again with granting
+ * permissions for the primary process token of the current process.
+ */
+ if (change_token_to_primary(&old_token))
+ {
+ token = try_grant_permissions_and_open_process_token(process, rights);
+ revert_to_token(old_token);
+ if (token)
+ return token;
+ }
+
+ /*
+ * TODO: Sorry, no other option for now...
+ * It could be possible to use Take Ownership Name privilege to
+ * temporary change token owner of specified process to the owner of
+ * the current thread token, grant permissions for current thread in
+ * that process token, change ownership back to original one, open
+ * that process token and revert granted permissions. But this is
+ * not implemented yet.
+ */
+ return NULL;
+}
+
+/*
+ * Set x86 I/O Privilege Level to 3 for the whole current NT process. Do it via
+ * NtSetInformationProcess() call with ProcessUserModeIOPL information class,
+ * which is supported by 32-bit Windows NT kernel versions and requires Tcb
+ * privilege.
+ */
+static BOOL
+SetProcessUserModeIOPL(VOID)
+{
+ NtSetInformationProcessProt MyNtSetInformationProcess;
+
+ LUID luid_tcb_privilege;
+ LUID luid_impersonate_privilege;
+
+ HANDLE revert_token_tcb_privilege;
+ BOOL revert_only_tcb_privilege;
+
+ HANDLE revert_token_impersonate_privilege;
+ BOOL revert_only_impersonate_privilege;
+
+ BOOL impersonate_privilege_enabled;
+
+ BOOL revert_to_old_token;
+ HANDLE old_token;
+
+ HANDLE lsass_process;
+ HANDLE lsass_token;
+
+ UINT prev_error_mode;
+ NTSTATUS nt_status;
+ HMODULE ntdll;
+ BOOL ret;
+
+ impersonate_privilege_enabled = FALSE;
+ revert_to_old_token = FALSE;
+ lsass_token = NULL;
+ old_token = NULL;
+
+ /* Fast path when ProcessUserModeIOPL was already called. */
+ if (read_iopl() == 3)
+ return TRUE;
+
+ /*
+ * Load ntdll.dll library with disabled critical-error-handler message box.
+ * It means that NT kernel does not show unwanted GUI message box to user
+ * when LoadLibrary() function fails.
+ */
+ prev_error_mode = change_error_mode(SEM_FAILCRITICALERRORS);
+ ntdll = LoadLibrary(TEXT("ntdll.dll"));
+ change_error_mode(prev_error_mode);
+ if (!ntdll)
+ goto err_not_implemented;
+
+ /* Retrieve pointer to NtSetInformationProcess() function. */
+ MyNtSetInformationProcess = (NtSetInformationProcessProt)(LPVOID)GetProcAddress(ntdll, "NtSetInformationProcess");
+ if (!MyNtSetInformationProcess)
+ goto err_not_implemented;
+
+ /*
+ * ProcessUserModeIOPL is syscall for NT kernel to change x86 IOPL
+ * of the current running process to 3.
+ *
+ * Process handle argument for ProcessUserModeIOPL is ignored and
+ * IOPL is always changed for the current running process. So pass
+ * GetCurrentProcess() handle for documentation purpose. Process
+ * information buffer and length are unused for ProcessUserModeIOPL.
+ *
+ * ProcessUserModeIOPL may success (return value >= 0) or may fail
+ * because it is not implemented or because of missing privilege.
+ * Other errors are not defined, so handle them as unknown.
+ */
+ nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0);
+ if (nt_status >= 0)
+ goto verify;
+ else if (nt_status == STATUS_NOT_IMPLEMENTED)
+ goto err_not_implemented;
+ else if (nt_status != STATUS_PRIVILEGE_NOT_HELD)
+ goto err_unknown;
+
+ /*
+ * If ProcessUserModeIOPL call failed with STATUS_PRIVILEGE_NOT_HELD
+ * error then it means that the current thread token does not have
+ * Tcb privilege enabled. Try to enable it.
+ */
+
+ if (!LookupPrivilegeValue(NULL, SE_TCB_NAME, &luid_tcb_privilege))
+ goto err_not_implemented;
+
+ /*
+ * If the current thread has already Tcb privilege enabled then there
+ * is some additional unhanded restriction.
+ */
+ if (have_privilege(luid_tcb_privilege))
+ goto err_privilege_not_held;
+
+ /* Try to enable Tcb privilege and try ProcessUserModeIOPL call again. */
+ if (enable_privilege(luid_tcb_privilege, &revert_token_tcb_privilege, &revert_only_tcb_privilege))
+ {
+ nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0);
+ revert_privilege(luid_tcb_privilege, revert_token_tcb_privilege, revert_only_tcb_privilege);
+ if (nt_status >= 0)
+ goto verify;
+ else if (nt_status == STATUS_NOT_IMPLEMENTED)
+ goto err_not_implemented;
+ else if (nt_status == STATUS_PRIVILEGE_NOT_HELD)
+ goto err_privilege_not_held;
+ else
+ goto err_unknown;
+ }
+
+ /*
+ * If enabling of Tcb privilege failed then it means that current thread
+ * does not this privilege. But current process may have it. So try it
+ * again with primary process access token.
+ */
+
+ /*
+ * If system supports Impersonate privilege (Windows 2000 SP4 or higher) then
+ * all future actions in this function require this Impersonate privilege.
+ * So try to enable it in case it is currently disabled.
+ */
+ if (LookupPrivilegeValue(NULL, SE_IMPERSONATE_NAME, &luid_impersonate_privilege) &&
+ !have_privilege(luid_impersonate_privilege))
+ {
+ /*
+ * If current thread does not have Impersonate privilege enabled
+ * then first try to enable it just for the current thread. If
+ * it is not possible to enable it just for the current thread
+ * then try it to enable globally for whole process (which
+ * affects all process threads). Both actions will be reverted
+ * at the end of this function.
+ */
+ if (enable_privilege(luid_impersonate_privilege, &revert_token_impersonate_privilege, &revert_only_impersonate_privilege))
+ {
+ impersonate_privilege_enabled = TRUE;
+ }
+ else if (enable_privilege(luid_impersonate_privilege, NULL, NULL))
+ {
+ impersonate_privilege_enabled = TRUE;
+ revert_token_impersonate_privilege = NULL;
+ revert_only_impersonate_privilege = TRUE;
+ }
+ else
+ {
+ goto err_privilege_not_held;
+ }
+
+ /*
+ * Now when Impersonate privilege is enabled, try to enable Tcb
+ * privilege again. Enabling other privileges for the current
+ * thread requires Impersonate privilege, so enabling Tcb again
+ * could now pass.
+ */
+ if (enable_privilege(luid_tcb_privilege, &revert_token_tcb_privilege, &revert_only_tcb_privilege))
+ {
+ nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0);
+ revert_privilege(luid_tcb_privilege, revert_token_tcb_privilege, revert_only_tcb_privilege);
+ if (nt_status >= 0)
+ goto verify;
+ else if (nt_status == STATUS_NOT_IMPLEMENTED)
+ goto err_not_implemented;
+ else if (nt_status == STATUS_PRIVILEGE_NOT_HELD)
+ goto err_privilege_not_held;
+ else
+ goto err_unknown;
+ }
+ }
+
+ /*
+ * If enabling Tcb privilege failed then it means that the current
+ * thread access token does not have this privilege or does not
+ * have permission to adjust privileges.
+ *
+ * Try to use more privileged token from Local Security Authority
+ * Subsystem Service process (lsass.exe) which has Tcb privilege.
+ * Retrieving this more privileged token is possible for local
+ * administrators (unless it was disabled by local administrators).
+ */
+
+ lsass_process = find_and_open_process_for_query("lsass.exe");
+ if (!lsass_process)
+ goto err_privilege_not_held;
+
+ /*
+ * Open primary lsass.exe process access token with query and duplicate
+ * rights. Just these two rights are required for impersonating other
+ * primary process token (impersonate right is really not required!).
+ */
+ lsass_token = open_process_token_with_rights(lsass_process, TOKEN_QUERY | TOKEN_DUPLICATE);
+
+ CloseHandle(lsass_process);
+
+ if (!lsass_token)
+ goto err_privilege_not_held;
+
+ /*
+ * After successful open of the primary lsass.exe process access token,
+ * assign its copy for the current thread.
+ */
+ if (!change_token(lsass_token, &old_token))
+ goto err_privilege_not_held;
+
+ revert_to_old_token = TRUE;
+
+ nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0);
+ if (nt_status == STATUS_PRIVILEGE_NOT_HELD)
+ {
+ /*
+ * Now current thread is not using primary process token anymore
+ * but is using custom access token. There is no need to revert
+ * enabled Tcb privilege as the whole custom access token would
+ * be reverted. So there is no need to setup revert method for
+ * enabling privilege.
+ */
+ if (have_privilege(luid_tcb_privilege) ||
+ !enable_privilege(luid_tcb_privilege, NULL, NULL))
+ goto err_privilege_not_held;
+ nt_status = MyNtSetInformationProcess(GetCurrentProcess(), ProcessUserModeIOPL, NULL, 0);
+ }
+ if (nt_status >= 0)
+ goto verify;
+ else if (nt_status == STATUS_NOT_IMPLEMENTED)
+ goto err_not_implemented;
+ else if (nt_status == STATUS_PRIVILEGE_NOT_HELD)
+ goto err_privilege_not_held;
+ else
+ goto err_unknown;
+
+verify:
+ /*
+ * Some Windows NT kernel versions (e.g. Windows 2003 x64) do not
+ * implement ProcessUserModeIOPL syscall at all but incorrectly
+ * returns success when it is called by user process. So always
+ * after this call verify that IOPL is set to 3.
+ */
+ if (read_iopl() != 3)
+ goto err_not_implemented;
+ ret = TRUE;
+ goto ret;
+
+err_not_implemented:
+ SetLastError(ERROR_INVALID_FUNCTION);
+ ret = FALSE;
+ goto ret;
+
+err_privilege_not_held:
+ SetLastError(ERROR_PRIVILEGE_NOT_HELD);
+ ret = FALSE;
+ goto ret;
+
+err_unknown:
+ SetLastError(ERROR_GEN_FAILURE);
+ ret = FALSE;
+ goto ret;
+
+ret:
+ if (revert_to_old_token)
+ revert_to_token(old_token);
+
+ if (impersonate_privilege_enabled)
+ revert_privilege(luid_impersonate_privilege, revert_token_impersonate_privilege, revert_only_impersonate_privilege);
+
+ if (lsass_token)
+ CloseHandle(lsass_token);
+
+ if (ntdll)
+ FreeLibrary(ntdll);
+
+ return ret;
+}
+
static int
intel_setup_io(struct pci_access *a)
{
- typedef int (*MYPROC)(void);
- MYPROC InitializeWinIo;
- HMODULE lib;
-
#ifndef _WIN64
/* 16/32-bit non-NT systems allow applications to access PCI I/O ports without any special setup. */
OSVERSIONINFOA version;
}
#endif
- lib = LoadLibrary("WinIo.dll");
- if (!lib)
- {
- a->warning("i386-io-windows: Couldn't load WinIo.dll.");
- return 0;
- }
- /* XXX: Is this really needed? --mj */
- GetProcAddress(lib, "InitializeWinIo");
-
- InitializeWinIo = (MYPROC) GetProcAddress(lib, "InitializeWinIo");
- if (!InitializeWinIo)
+ /* On NT-based systems issue ProcessUserModeIOPL syscall which changes IOPL to 3. */
+ if (!SetProcessUserModeIOPL())
{
- a->warning("i386-io-windows: Couldn't find InitializeWinIo function.");
- return 0;
- }
-
- if (!InitializeWinIo())
- {
- a->warning("i386-io-windows: InitializeWinIo() failed.");
+ DWORD error = GetLastError();
+ a->debug("NT ProcessUserModeIOPL call failed: %s.", error == ERROR_INVALID_FUNCTION ? "Not Implemented" : error == ERROR_PRIVILEGE_NOT_HELD ? "Access Denied" : "Operation Failed");
return 0;
}
+ a->debug("NT ProcessUserModeIOPL call succeeded...");
return 1;
}
-static inline int
+static inline void
intel_cleanup_io(struct pci_access *a UNUSED)
{
- //TODO: DeInitializeWinIo!
- return 1;
+ /*
+ * 16/32-bit non-NT systems do not use any special setup and on NT-based
+ * systems ProcessUserModeIOPL permanently changes IOPL to 3 for the current
+ * NT process, no revert for current process is possible.
+ */
}
static inline void intel_io_lock(void)
projects / pciutils.git / blobdiff