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-rw-r--r--src/VBox/Runtime/r3/linux/krnlmod-linux.cpp358
1 files changed, 358 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/linux/krnlmod-linux.cpp b/src/VBox/Runtime/r3/linux/krnlmod-linux.cpp
new file mode 100644
index 00000000..6d81d530
--- /dev/null
+++ b/src/VBox/Runtime/r3/linux/krnlmod-linux.cpp
@@ -0,0 +1,358 @@
+/* $Id: krnlmod-linux.cpp $ */
+/** @file
+ * IPRT - Kernel module, Linux.
+ */
+
+/*
+ * Copyright (C) 2017-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SYSTEM
+#include <iprt/krnlmod.h>
+#include <iprt/linux/sysfs.h>
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/dir.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+#include <iprt/types.h>
+
+
+/**
+ * Internal kernel information record state.
+ */
+typedef struct RTKRNLMODINFOINT
+{
+ /** Reference counter. */
+ volatile uint32_t cRefs;
+ /** Reference count for the kernel module. */
+ uint32_t cRefKrnlMod;
+ /** Load address of the kernel module. */
+ RTR0UINTPTR uLoadAddr;
+ /** Size of the kernel module. */
+ size_t cbKrnlMod;
+ /** Size of the name in characters including the zero terminator. */
+ size_t cchName;
+ /** Module name - variable in size. */
+ char achName[1];
+} RTKRNLMODINFOINT;
+/** Pointer to the internal kernel module information record. */
+typedef RTKRNLMODINFOINT *PRTKRNLMODINFOINT;
+/** Pointer to a const internal kernel module information record. */
+typedef const RTKRNLMODINFOINT *PCRTKRNLMODINFOINT;
+
+
+
+/**
+ * Destroy the given kernel module information record.
+ *
+ * @param pThis The record to destroy.
+ */
+static void rtKrnlModInfoDestroy(PRTKRNLMODINFOINT pThis)
+{
+ RTMemFree(pThis);
+}
+
+
+static int rtKrnlModLinuxReadIntFileDef(unsigned uBase, int64_t *pi64, int64_t i64Def,
+ const char *pszName, const char *pszPath)
+{
+ int rc = RTLinuxSysFsReadIntFile(uBase, pi64, "module/%s/%s", pszName, pszPath);
+ if (rc == VERR_FILE_NOT_FOUND)
+ {
+ *pi64 = i64Def;
+ rc = VINF_SUCCESS;
+ }
+
+ return rc;
+}
+
+/**
+ * Creates a new kernel module information record for the given module.
+ *
+ * @returns IPRT status code.
+ * @param pszName The kernel module name.
+ * @param phKrnlModInfo Where to store the handle to the kernel module information record
+ * on success.
+ */
+static int rtKrnlModLinuxInfoCreate(const char *pszName, PRTKRNLMODINFO phKrnlModInfo)
+{
+ int rc = VINF_SUCCESS;
+ size_t cchName = strlen(pszName) + 1;
+ PRTKRNLMODINFOINT pThis = (PRTKRNLMODINFOINT)RTMemAllocZ(RT_UOFFSETOF_DYN(RTKRNLMODINFOINT, achName[cchName]));
+ if (RT_LIKELY(pThis))
+ {
+ memcpy(&pThis->achName[0], pszName, cchName);
+ pThis->cchName = cchName;
+ pThis->cRefs = 1;
+
+ int64_t iTmp = 0;
+ rc = rtKrnlModLinuxReadIntFileDef(10, &iTmp, 0, pszName, "refcnt");
+ if (RT_SUCCESS(rc))
+ pThis->cRefKrnlMod = (uint32_t)iTmp;
+
+ rc = rtKrnlModLinuxReadIntFileDef(10, &iTmp, 0, pszName, "coresize");
+ if (RT_SUCCESS(rc))
+ pThis->cbKrnlMod = iTmp;
+
+ rc = rtKrnlModLinuxReadIntFileDef(16, &iTmp, 0, pszName, "sections/.text");
+ if (RT_SUCCESS(rc))
+ pThis->uLoadAddr = iTmp;
+
+ if (RT_SUCCESS(rc))
+ *phKrnlModInfo = pThis;
+ else
+ RTMemFree(pThis);
+ }
+ else
+ rc = VERR_NO_MEMORY;
+
+ return rc;
+}
+
+
+RTDECL(int) RTKrnlModQueryLoaded(const char *pszName, bool *pfLoaded)
+{
+ AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+ AssertPtrReturn(pfLoaded, VERR_INVALID_POINTER);
+
+ int rc = RTLinuxSysFsExists("module/%s", pszName);
+ if (rc == VINF_SUCCESS)
+ *pfLoaded = true;
+ else if (rc == VERR_FILE_NOT_FOUND)
+ {
+ *pfLoaded = false;
+ rc = VINF_SUCCESS;
+ }
+
+ return rc;
+}
+
+
+RTDECL(int) RTKrnlModLoadedQueryInfo(const char *pszName, PRTKRNLMODINFO phKrnlModInfo)
+{
+ AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+ AssertPtrReturn(phKrnlModInfo, VERR_INVALID_POINTER);
+
+ int rc = RTLinuxSysFsExists("module/%s", pszName);
+ if (rc == VINF_SUCCESS)
+ rc = rtKrnlModLinuxInfoCreate(pszName, phKrnlModInfo);
+ else if (rc == VERR_FILE_NOT_FOUND)
+ rc = VERR_NOT_FOUND;
+
+ return rc;
+}
+
+
+RTDECL(uint32_t) RTKrnlModLoadedGetCount(void)
+{
+ uint32_t cKmodsLoaded = 0;
+
+ RTDIR hDir = NULL;
+ int rc = RTDirOpen(&hDir, "/sys/module");
+ if (RT_SUCCESS(rc))
+ {
+ RTDIRENTRY DirEnt;
+ rc = RTDirRead(hDir, &DirEnt, NULL);
+ while (RT_SUCCESS(rc))
+ {
+ if (!RTDirEntryIsStdDotLink(&DirEnt))
+ cKmodsLoaded++;
+ rc = RTDirRead(hDir, &DirEnt, NULL);
+ }
+
+ RTDirClose(hDir);
+ }
+
+
+ return cKmodsLoaded;
+}
+
+
+RTDECL(int) RTKrnlModLoadedQueryInfoAll(PRTKRNLMODINFO pahKrnlModInfo, uint32_t cEntriesMax,
+ uint32_t *pcEntries)
+{
+ if (cEntriesMax > 0)
+ AssertPtrReturn(pahKrnlModInfo, VERR_INVALID_POINTER);
+
+ uint32_t cKmodsLoaded = RTKrnlModLoadedGetCount();
+ if (cEntriesMax < cKmodsLoaded)
+ {
+ if (*pcEntries)
+ *pcEntries = cKmodsLoaded;
+ return VERR_BUFFER_OVERFLOW;
+ }
+
+ RTDIR hDir = NULL;
+ int rc = RTDirOpen(&hDir, "/sys/module");
+ if (RT_SUCCESS(rc))
+ {
+ unsigned idxKrnlModInfo = 0;
+ RTDIRENTRY DirEnt;
+
+ rc = RTDirRead(hDir, &DirEnt, NULL);
+ while (RT_SUCCESS(rc))
+ {
+ if (!RTDirEntryIsStdDotLink(&DirEnt))
+ {
+ rc = rtKrnlModLinuxInfoCreate(DirEnt.szName, &pahKrnlModInfo[idxKrnlModInfo]);
+ if (RT_SUCCESS(rc))
+ idxKrnlModInfo++;
+ }
+
+ if (RT_SUCCESS(rc))
+ rc = RTDirRead(hDir, &DirEnt, NULL);
+ }
+
+ if (rc == VERR_NO_MORE_FILES)
+ rc = VINF_SUCCESS;
+ else if (RT_FAILURE(rc))
+ {
+ /* Rollback */
+ while (idxKrnlModInfo-- > 0)
+ RTKrnlModInfoRelease(pahKrnlModInfo[idxKrnlModInfo]);
+ }
+
+ if (*pcEntries)
+ *pcEntries = cKmodsLoaded;
+
+ RTDirClose(hDir);
+ }
+
+ return rc;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoRetain(RTKRNLMODINFO hKrnlModInfo)
+{
+ PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+ AssertPtrReturn(pThis, UINT32_MAX);
+
+ uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+ AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
+ return cRefs;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoRelease(RTKRNLMODINFO hKrnlModInfo)
+{
+ PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+ if (!pThis)
+ return 0;
+ AssertPtrReturn(pThis, UINT32_MAX);
+
+ uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
+ AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
+ if (cRefs == 0)
+ rtKrnlModInfoDestroy(pThis);
+ return cRefs;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoGetRefCnt(RTKRNLMODINFO hKrnlModInfo)
+{
+ PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+ AssertPtrReturn(pThis, 0);
+
+ return pThis->cRefKrnlMod;
+}
+
+
+RTDECL(const char *) RTKrnlModInfoGetName(RTKRNLMODINFO hKrnlModInfo)
+{
+ PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+ AssertPtrReturn(pThis, NULL);
+
+ return &pThis->achName[0];
+}
+
+
+RTDECL(const char *) RTKrnlModInfoGetFilePath(RTKRNLMODINFO hKrnlModInfo)
+{
+ PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+ AssertPtrReturn(pThis, NULL);
+
+ return NULL;
+}
+
+
+RTDECL(size_t) RTKrnlModInfoGetSize(RTKRNLMODINFO hKrnlModInfo)
+{
+ PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+ AssertPtrReturn(pThis, 0);
+
+ return pThis->cbKrnlMod;
+}
+
+
+RTDECL(RTR0UINTPTR) RTKrnlModInfoGetLoadAddr(RTKRNLMODINFO hKrnlModInfo)
+{
+ PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+ AssertPtrReturn(pThis, 0);
+
+ return pThis->uLoadAddr;
+}
+
+
+RTDECL(int) RTKrnlModInfoQueryRefModInfo(RTKRNLMODINFO hKrnlModInfo, uint32_t idx,
+ PRTKRNLMODINFO phKrnlModInfoRef)
+{
+ RT_NOREF3(hKrnlModInfo, idx, phKrnlModInfoRef);
+ return VERR_NOT_IMPLEMENTED;
+}
+
+
+RTDECL(int) RTKrnlModLoadByName(const char *pszName)
+{
+ AssertPtrReturn(pszName, VERR_INVALID_PARAMETER);
+
+ return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(int) RTKrnlModLoadByPath(const char *pszPath)
+{
+ AssertPtrReturn(pszPath, VERR_INVALID_PARAMETER);
+
+ return VERR_NOT_SUPPORTED;
+}
+
+
+RTDECL(int) RTKrnlModUnloadByName(const char *pszName)
+{
+ AssertPtrReturn(pszName, VERR_INVALID_PARAMETER);
+
+ return VERR_NOT_SUPPORTED;
+}
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