* autoload.cc (GetSecurityInfo): Remove.
* ntdll.h (RtlConvertToAutoInheritSecurityObject): Declare. (RtlDeleteSecurityObject): Declare. (RtlGetControlSecurityDescriptor): Declare. (RtlLengthSecurityDescriptor): Declare. * security.cc (file_mapping): New global variable. (get_file_sd): Rewrite. Clean up code. Get rid of GetSecurityInfo call. (alloc_sd): Call RtlSetControlSecurityDescriptor to set SE_DACL_PROTECTED flag. (check_file_access): Remove mapping. Use file_mapping instead. (check_registry_access): Rename mapping to reg_mapping. * wincap.cc: Througout, drop use_get_sec_info_on_dirs, * wincap.h (struct wincaps): Drop use_get_sec_info_on_dirs.
This commit is contained in:
Corinna Vinschen
parent
aa83f124e4
commit
f97612978a
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@ -1,3 +1,20 @@
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2011-04-28 Corinna Vinschen <corinna@vinschen.de>
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* autoload.cc (GetSecurityInfo): Remove.
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* ntdll.h (RtlConvertToAutoInheritSecurityObject): Declare.
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(RtlDeleteSecurityObject): Declare.
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(RtlGetControlSecurityDescriptor): Declare.
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(RtlLengthSecurityDescriptor): Declare.
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* security.cc (file_mapping): New global variable.
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(get_file_sd): Rewrite. Clean up code. Get rid of GetSecurityInfo
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call.
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(alloc_sd): Call RtlSetControlSecurityDescriptor to set
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SE_DACL_PROTECTED flag.
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(check_file_access): Remove mapping. Use file_mapping instead.
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(check_registry_access): Rename mapping to reg_mapping.
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* wincap.cc: Througout, drop use_get_sec_info_on_dirs,
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* wincap.h (struct wincaps): Drop use_get_sec_info_on_dirs.
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2011-04-24 Corinna Vinschen <corinna@vinschen.de>
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* include/fenv.h: Add missing _FENV_H_ define.
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@ -357,7 +357,6 @@ LoadDLLfunc (CryptAcquireContextW, 20, advapi32)
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LoadDLLfunc (CryptGenRandom, 12, advapi32)
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LoadDLLfunc (CryptReleaseContext, 8, advapi32)
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LoadDLLfunc (DeregisterEventSource, 4, advapi32)
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LoadDLLfunc (GetSecurityInfo, 32, advapi32)
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LoadDLLfunc (LogonUserW, 24, advapi32)
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LoadDLLfunc (LookupAccountNameW, 28, advapi32)
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LoadDLLfunc (LookupAccountSidW, 28, advapi32)
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@ -1,7 +1,7 @@
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/* ntdll.h. Contains ntdll specific stuff not defined elsewhere.
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Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
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2009, 2010 Red Hat, Inc.
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2009, 2010, 2011 Red Hat, Inc.
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This file is part of Cygwin.
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@ -1105,12 +1105,18 @@ extern "C"
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LONG NTAPI RtlCompareUnicodeString (PUNICODE_STRING, PUNICODE_STRING,
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BOOLEAN);
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NTSTATUS NTAPI RtlConvertSidToUnicodeString (PUNICODE_STRING, PSID, BOOLEAN);
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VOID NTAPI RtlCopyUnicodeString (PUNICODE_STRING, PUNICODE_STRING);
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NTSTATUS NTAPI RtlConvertToAutoInheritSecurityObject (PSECURITY_DESCRIPTOR,
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PSECURITY_DESCRIPTOR,
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PSECURITY_DESCRIPTOR *,
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GUID *, BOOLEAN,
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PGENERIC_MAPPING);
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NTSTATUS NTAPI RtlCopySid (ULONG, PSID, PSID);
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VOID NTAPI RtlCopyUnicodeString (PUNICODE_STRING, PUNICODE_STRING);
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NTSTATUS NTAPI RtlCreateAcl (PACL, ULONG, ULONG);
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NTSTATUS NTAPI RtlCreateRegistryKey (ULONG, PCWSTR);
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NTSTATUS NTAPI RtlCreateSecurityDescriptor (PSECURITY_DESCRIPTOR, ULONG);
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BOOLEAN NTAPI RtlCreateUnicodeStringFromAsciiz (PUNICODE_STRING, PCSTR);
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NTSTATUS NTAPI RtlDeleteSecurityObject (PSECURITY_DESCRIPTOR *);
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NTSTATUS NTAPI RtlDowncaseUnicodeString (PUNICODE_STRING, PUNICODE_STRING,
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BOOLEAN);
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NTSTATUS NTAPI RtlEnterCriticalSection (PRTL_CRITICAL_SECTION);
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@ -1124,6 +1130,9 @@ extern "C"
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VOID NTAPI RtlFreeUnicodeString (PUNICODE_STRING);
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BOOLEAN NTAPI RtlFirstFreeAce (PACL, PVOID *);
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NTSTATUS NTAPI RtlGetAce (PACL, ULONG, PVOID);
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NTSTATUS NTAPI RtlGetControlSecurityDescriptor (PSECURITY_DESCRIPTOR,
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PSECURITY_DESCRIPTOR_CONTROL,
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PULONG);
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HANDLE NTAPI RtlGetCurrentTransaction ();
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NTSTATUS NTAPI RtlGetDaclSecurityDescriptor (PSECURITY_DESCRIPTOR, PBOOLEAN,
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PACL *, PBOOLEAN);
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@ -1138,6 +1147,7 @@ extern "C"
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NTSTATUS NTAPI RtlIntegerToUnicodeString (ULONG, ULONG, PUNICODE_STRING);
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ULONG NTAPI RtlIsDosDeviceName_U (PCWSTR);
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NTSTATUS NTAPI RtlLeaveCriticalSection (PRTL_CRITICAL_SECTION);
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ULONG NTAPI RtlLengthSecurityDescriptor (PSECURITY_DESCRIPTOR);
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ULONG NTAPI RtlLengthSid (PSID);
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ULONG NTAPI RtlNtStatusToDosError (NTSTATUS);
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NTSTATUS NTAPI RtlOemStringToUnicodeString (PUNICODE_STRING, POEM_STRING,
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@ -31,94 +31,164 @@ details. */
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| GROUP_SECURITY_INFORMATION \
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| OWNER_SECURITY_INFORMATION)
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static NO_COPY GENERIC_MAPPING file_mapping = { FILE_GENERIC_READ,
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FILE_GENERIC_WRITE,
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FILE_GENERIC_EXECUTE,
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FILE_ALL_ACCESS };
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LONG
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get_file_sd (HANDLE fh, path_conv &pc, security_descriptor &sd,
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bool justcreated)
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{
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DWORD error = ERROR_SUCCESS;
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int retry = 0;
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int res = -1;
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for (; retry < 2; ++retry)
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{
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if (fh)
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{
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/* Amazing but true. If you want to know if an ACE is inherited
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from the parent object, you can't use the NtQuerySecurityObject
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function. In the DACL returned by this functions, the
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INHERITED_ACE flag is never set. Only by calling GetSecurityInfo
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you get this information.
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However, this functionality is slow, and the extra information is
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only required when the file has been created and the permissions
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are about to be set to POSIX permissions. Therefore we only use
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it in case the file just got created. In all other cases we
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rather call NtQuerySecurityObject directly...
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...except that there's a problem on 5.1 and 5.2 kernels. The
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GetSecurityInfo call on a file sometimes returns with
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ERROR_INVALID_ADDRESS if a former request for the SD of the
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parent directory (or one of the parent directories?) used the
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NtQuerySecurityObject call, rather than GetSecurityInfo as well.
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As soon as all directory SDs are fetched using GetSecurityInfo,
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the problem disappears. */
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if (justcreated
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|| (pc.isdir () && wincap.use_get_sec_info_on_dirs ()))
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{
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PSECURITY_DESCRIPTOR psd;
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error = GetSecurityInfo (fh, SE_FILE_OBJECT,
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ALL_SECURITY_INFORMATION,
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NULL, NULL, NULL, NULL, &psd);
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if (error == ERROR_SUCCESS)
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{
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sd = psd;
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res = 0;
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break;
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}
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}
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else
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{
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NTSTATUS status;
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ULONG len = SD_MAXIMUM_SIZE;
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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ULONG len = SD_MAXIMUM_SIZE, rlen;
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/* Allocate space for the security descriptor. */
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if (!sd.malloc (len))
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{
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set_errno (ENOMEM);
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break;
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return -1;
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}
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/* Try to fetch the security descriptor if the handle is valid. */
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if (fh)
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{
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status = NtQuerySecurityObject (fh, ALL_SECURITY_INFORMATION,
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sd, len, &len);
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if (NT_SUCCESS (status))
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{
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res = 0;
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break;
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}
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error = RtlNtStatusToDosError (status);
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}
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}
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if (!retry)
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{
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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NTSTATUS status;
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status = NtOpenFile (&fh, READ_CONTROL,
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pc.get_object_attr (attr, sec_none_nih),
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&io, FILE_SHARE_VALID_FLAGS,
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FILE_OPEN_FOR_BACKUP_INTENT);
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sd, len, &rlen);
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if (!NT_SUCCESS (status))
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{
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debug_printf ("NtQuerySecurityObject (%S), status %p",
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pc.get_nt_native_path (), status);
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fh = NULL;
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error = RtlNtStatusToDosError (status);
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break;
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}
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}
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/* If the handle was NULL, or fetching with the original handle didn't work,
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try to reopen the file with READ_CONTROL and fetch the security descriptor
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using that handle. */
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if (!fh)
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{
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status = NtOpenFile (&fh, READ_CONTROL,
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pc.get_object_attr (attr, sec_none_nih), &io,
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FILE_SHARE_VALID_FLAGS, FILE_OPEN_FOR_BACKUP_INTENT);
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if (!NT_SUCCESS (status))
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{
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sd.free ();
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__seterrno_from_nt_status (status);
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return -1;
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}
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if (retry && fh)
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status = NtQuerySecurityObject (fh, ALL_SECURITY_INFORMATION,
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sd, len, &rlen);
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NtClose (fh);
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if (error != ERROR_SUCCESS)
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__seterrno_from_win_error (error);
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return res;
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if (!NT_SUCCESS (status))
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{
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sd.free ();
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__seterrno_from_nt_status (status);
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return -1;
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}
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}
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/* Ok, so we have a security descriptor now. Unfortunately, if you want
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to know if an ACE is inherited from the parent object, you can't just
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call NtQuerySecurityObject once. The problem is this:
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In the simple case, the SDs control word contains one of the
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SE_DACL_AUTO_INHERITED or SE_DACL_PROTECTED flags, or at least one of
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the ACEs has the INHERITED_ACE flag set. In all of these cases the
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GetSecurityInfo function calls NtQuerySecurityObject only once, too,
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apparently because it figures that the DACL is self-sufficient, which
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it usually is. Windows Explorer, for instance, takes great care to
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set these flags in a security descriptor if you change the ACL in the
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GUI property dialog.
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The tricky case is if none of these flags is set in the SD. That means
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the information whether or not an ACE has been inherited is not available
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in the DACL of the object. In this case GetSecurityInfo also fetches the
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SD from the parent directory and tests if the object's SD contains
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inherited ACEs from the parent. The below code is closly emulating the
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behaviour of GetSecurityInfo so we can get rid of this advapi32 dependency.
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However, this functionality is slow, and the extra information is only
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required when the file has been created and the permissions are about
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to be set to POSIX permissions. Therefore we only use it in case the
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file just got created.
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Note that GetSecurityInfo has a problem on 5.1 and 5.2 kernels. Sometimes
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it returns ERROR_INVALID_ADDRESS if a former request for the parent
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directories' SD used NtQuerySecurityObject, rather than GetSecurityInfo
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as well. See http://cygwin.com/ml/cygwin-developers/2011-03/msg00027.html
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for the solution. This problem does not occur with the below code, so
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the workaround could be removed. */
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if (justcreated)
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{
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SECURITY_DESCRIPTOR_CONTROL ctrl;
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ULONG dummy;
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PACL dacl;
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BOOLEAN exists, def;
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ACCESS_ALLOWED_ACE *ace;
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UNICODE_STRING dirname;
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PSECURITY_DESCRIPTOR psd, nsd;
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tmp_pathbuf tp;
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/* Check SDs control flags. If SE_DACL_AUTO_INHERITED or
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SE_DACL_PROTECTED is set we're done. */
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RtlGetControlSecurityDescriptor (sd, &ctrl, &dummy);
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if (ctrl & (SE_DACL_AUTO_INHERITED | SE_DACL_PROTECTED))
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return 0;
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/* Otherwise iterate over the ACEs and see if any one of them has the
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INHERITED_ACE flag set. If so, we're done. */
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if (NT_SUCCESS (RtlGetDaclSecurityDescriptor (sd, &exists, &dacl, &def))
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&& exists && dacl)
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for (ULONG idx = 0; idx < dacl->AceCount; ++idx)
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if (RtlGetAce (dacl, idx, (PVOID *) &ace)
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&& (ace->Header.AceFlags & INHERITED_ACE))
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return 0;
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/* Otherwise, open the parent directory with READ_CONTROL... */
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RtlSplitUnicodePath (pc.get_nt_native_path (), &dirname, NULL);
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InitializeObjectAttributes (&attr, &dirname, pc.objcaseinsensitive (),
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NULL, NULL);
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status = NtOpenFile (&fh, READ_CONTROL, &attr, &io,
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FILE_SHARE_VALID_FLAGS,
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FILE_OPEN_FOR_BACKUP_INTENT
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| FILE_OPEN_REPARSE_POINT);
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if (!NT_SUCCESS (status))
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{
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debug_printf ("NtOpenFile (%S), status %p", &dirname, status);
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return 0;
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}
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/* ... fetch the parent's security descriptor ... */
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psd = (PSECURITY_DESCRIPTOR) tp.w_get ();
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status = NtQuerySecurityObject (fh, ALL_SECURITY_INFORMATION,
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psd, len, &rlen);
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NtClose (fh);
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if (!NT_SUCCESS (status))
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{
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debug_printf ("NtQuerySecurityObject (%S), status %p",
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&dirname, status);
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return 0;
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}
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/* ... and create a new security descriptor in which all inherited ACEs
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are marked with the INHERITED_ACE flag. For a description of the
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undocumented RtlConvertToAutoInheritSecurityObject function from
|
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ntdll.dll see the MSDN man page for the advapi32 function
|
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ConvertToAutoInheritPrivateObjectSecurity. Fortunately the latter
|
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is just a shim. */
|
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status = RtlConvertToAutoInheritSecurityObject (psd, sd, &nsd, NULL,
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pc.isdir (),
|
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&file_mapping);
|
||||
if (!NT_SUCCESS (status))
|
||||
{
|
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debug_printf ("RtlConvertToAutoInheritSecurityObject (%S), status %p",
|
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&dirname, status);
|
||||
return 0;
|
||||
}
|
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/* Eventually copy the new security descriptor into sd and delete the
|
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original one created by RtlConvertToAutoInheritSecurityObject from
|
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the heap. */
|
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len = RtlLengthSecurityDescriptor (nsd);
|
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memcpy ((PSECURITY_DESCRIPTOR) sd, nsd, len);
|
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RtlDeleteSecurityObject (&nsd);
|
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}
|
||||
return 0;
|
||||
}
|
||||
|
||||
LONG
|
||||
|
|
@ -482,7 +552,7 @@ alloc_sd (path_conv &pc, __uid32_t uid, __gid32_t gid, int attribute,
|
|||
|
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/* We set the SE_DACL_PROTECTED flag here to prevent the DACL from being
|
||||
modified by inheritable ACEs. */
|
||||
sd.Control |= SE_DACL_PROTECTED;
|
||||
RtlSetControlSecurityDescriptor (&sd, SE_DACL_PROTECTED, SE_DACL_PROTECTED);
|
||||
|
||||
/* Create owner for local security descriptor. */
|
||||
if (!SetSecurityDescriptorOwner (&sd, owner_sid, FALSE))
|
||||
|
|
@ -974,10 +1044,6 @@ check_file_access (path_conv &pc, int flags, bool effective)
|
|||
{
|
||||
security_descriptor sd;
|
||||
int ret = -1;
|
||||
static GENERIC_MAPPING NO_COPY mapping = { FILE_GENERIC_READ,
|
||||
FILE_GENERIC_WRITE,
|
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FILE_GENERIC_EXECUTE,
|
||||
FILE_ALL_ACCESS };
|
||||
DWORD desired = 0;
|
||||
if (flags & R_OK)
|
||||
desired |= FILE_READ_DATA;
|
||||
|
|
@ -986,7 +1052,7 @@ check_file_access (path_conv &pc, int flags, bool effective)
|
|||
if (flags & X_OK)
|
||||
desired |= FILE_EXECUTE;
|
||||
if (!get_file_sd (NULL, pc, sd, false))
|
||||
ret = check_access (sd, mapping, desired, flags, effective);
|
||||
ret = check_access (sd, file_mapping, desired, flags, effective);
|
||||
debug_printf ("flags %x, ret %d", flags, ret);
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -996,7 +1062,7 @@ check_registry_access (HANDLE hdl, int flags, bool effective)
|
|||
{
|
||||
security_descriptor sd;
|
||||
int ret = -1;
|
||||
static GENERIC_MAPPING NO_COPY mapping = { KEY_READ,
|
||||
static GENERIC_MAPPING NO_COPY reg_mapping = { KEY_READ,
|
||||
KEY_WRITE,
|
||||
KEY_EXECUTE,
|
||||
KEY_ALL_ACCESS };
|
||||
|
|
@ -1008,7 +1074,7 @@ check_registry_access (HANDLE hdl, int flags, bool effective)
|
|||
if (flags & X_OK)
|
||||
desired |= KEY_QUERY_VALUE;
|
||||
if (!get_reg_sd (hdl, sd))
|
||||
ret = check_access (sd, mapping, desired, flags, effective);
|
||||
ret = check_access (sd, reg_mapping, desired, flags, effective);
|
||||
/* As long as we can't write the registry... */
|
||||
if (flags & W_OK)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -53,7 +53,6 @@ wincaps wincap_2000 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
|||
has_fast_cwd:false,
|
||||
has_restricted_raw_disk_access:false,
|
||||
use_dont_resolve_hack:false,
|
||||
use_get_sec_info_on_dirs:false,
|
||||
};
|
||||
|
||||
wincaps wincap_2000sp4 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
||||
|
|
@ -86,7 +85,6 @@ wincaps wincap_2000sp4 __attribute__((section (".cygwin_dll_common"), shared)) =
|
|||
has_fast_cwd:false,
|
||||
has_restricted_raw_disk_access:false,
|
||||
use_dont_resolve_hack:false,
|
||||
use_get_sec_info_on_dirs:false,
|
||||
};
|
||||
|
||||
wincaps wincap_xp __attribute__((section (".cygwin_dll_common"), shared)) = {
|
||||
|
|
@ -119,7 +117,6 @@ wincaps wincap_xp __attribute__((section (".cygwin_dll_common"), shared)) = {
|
|||
has_fast_cwd:false,
|
||||
has_restricted_raw_disk_access:false,
|
||||
use_dont_resolve_hack:true,
|
||||
use_get_sec_info_on_dirs:true,
|
||||
};
|
||||
|
||||
wincaps wincap_xpsp1 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
||||
|
|
@ -152,7 +149,6 @@ wincaps wincap_xpsp1 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
|||
has_fast_cwd:false,
|
||||
has_restricted_raw_disk_access:false,
|
||||
use_dont_resolve_hack:true,
|
||||
use_get_sec_info_on_dirs:true,
|
||||
};
|
||||
|
||||
wincaps wincap_xpsp2 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
||||
|
|
@ -185,7 +181,6 @@ wincaps wincap_xpsp2 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
|||
has_fast_cwd:false,
|
||||
has_restricted_raw_disk_access:false,
|
||||
use_dont_resolve_hack:true,
|
||||
use_get_sec_info_on_dirs:true,
|
||||
};
|
||||
|
||||
wincaps wincap_2003 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
||||
|
|
@ -218,7 +213,6 @@ wincaps wincap_2003 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
|||
has_fast_cwd:false,
|
||||
has_restricted_raw_disk_access:false,
|
||||
use_dont_resolve_hack:true,
|
||||
use_get_sec_info_on_dirs:true,
|
||||
};
|
||||
|
||||
wincaps wincap_vista __attribute__((section (".cygwin_dll_common"), shared)) = {
|
||||
|
|
@ -251,7 +245,6 @@ wincaps wincap_vista __attribute__((section (".cygwin_dll_common"), shared)) = {
|
|||
has_fast_cwd:true,
|
||||
has_restricted_raw_disk_access:true,
|
||||
use_dont_resolve_hack:false,
|
||||
use_get_sec_info_on_dirs:false,
|
||||
};
|
||||
|
||||
wincaps wincap_7 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
||||
|
|
@ -284,7 +277,6 @@ wincaps wincap_7 __attribute__((section (".cygwin_dll_common"), shared)) = {
|
|||
has_fast_cwd:true,
|
||||
has_restricted_raw_disk_access:true,
|
||||
use_dont_resolve_hack:false,
|
||||
use_get_sec_info_on_dirs:false,
|
||||
};
|
||||
|
||||
wincapc wincap __attribute__((section (".cygwin_dll_common"), shared));
|
||||
|
|
|
|||
|
|
@ -43,7 +43,6 @@ struct wincaps
|
|||
unsigned has_fast_cwd : 1;
|
||||
unsigned has_restricted_raw_disk_access : 1;
|
||||
unsigned use_dont_resolve_hack : 1;
|
||||
unsigned use_get_sec_info_on_dirs : 1;
|
||||
};
|
||||
|
||||
class wincapc
|
||||
|
|
@ -92,7 +91,6 @@ public:
|
|||
bool IMPLEMENT (has_fast_cwd)
|
||||
bool IMPLEMENT (has_restricted_raw_disk_access)
|
||||
bool IMPLEMENT (use_dont_resolve_hack)
|
||||
bool IMPLEMENT (use_get_sec_info_on_dirs)
|
||||
|
||||
#undef IMPLEMENT
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in New Issue