mirror of
https://github.com/mirror/processhacker
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wj32
e19d664c27
git-svn-id: svn://svn.code.sf.net/p/processhacker/code@512 21ef857c-d57f-4fe0-8362-d861dc6d29cd
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/*
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* Process Hacker Driver -
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* SSDT code
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*
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*
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*
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* This file is part of Process Hacker.
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*
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* Process Hacker is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Process Hacker is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Process Hacker. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ssdt.h"
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__declspec(dllimport) SSDT KeServiceDescriptorTable;
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MDL *ssdtMdl;
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PVOID *mappedSsdtCallTable;
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NTSTATUS SsdtInit()
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{
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ssdtMdl = MmCreateMdl(NULL,
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KeServiceDescriptorTable.ServiceTableBase, KeServiceDescriptorTable.NumberOfServices * 4);
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if (ssdtMdl == NULL)
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return STATUS_UNSUCCESSFUL;
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MmBuildMdlForNonPagedPool(ssdtMdl);
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ssdtMdl->MdlFlags |= MDL_MAPPED_TO_SYSTEM_VA;
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mappedSsdtCallTable = MmMapLockedPages(ssdtMdl, KernelMode);
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return STATUS_SUCCESS;
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}
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void SsdtDeinit()
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{
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if (ssdtMdl != NULL)
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{
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MmUnmapLockedPages(mappedSsdtCallTable, ssdtMdl);
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IoFreeMdl(ssdtMdl);
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}
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}
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PVOID SsdtGetEntry(PVOID zwFunction)
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{
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return SYSCALL_NT(zwFunction);
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}
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PVOID SsdtModifyEntry(PVOID zwFunction, PVOID ntFunction)
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{
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PVOID oldValue = SYSCALL_NT(zwFunction);
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InterlockedExchange(&mappedSsdtCallTable[SYSCALL_INDEX(zwFunction)], ntFunction);
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return oldValue;
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}
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