Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 247 insertions, 0 deletions

diff --git a/include/iprt/memsafer.h b/include/iprt/memsafer.h
new file mode 100644
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+++ b/include/iprt/memsafer.h
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+/** @file
+ * IPRT - Memory Allocate for Sensitive Data.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ */
+
+#ifndef IPRT_INCLUDED_memsafer_h
+#define IPRT_INCLUDED_memsafer_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/mem.h> /* RTMEM_TAG */
+
+RT_C_DECLS_BEGIN
+
+
+/** @defgroup grp_rt_memsafer   RTMemSafer - Memory Allocator for Sensitive Data
+ * @ingroup grp_rt
+ *
+ * This API doesn't provide 100% secure storage, it only provider more secure
+ * and safer storage.  Thus the API isn't called RTMemSafe because you cannot
+ * assume the data is safe against all kinds of extraction methods.
+ *
+ * The API guarantee that the memory won't be returned to the system containing
+ * any of the information you put there.  It will be repeatedly wiped after use.
+ *
+ * The API tries to isolate your data from other information stored in the
+ * process/system.  How well this is done depends on the implementation.  The
+ * more complicated implementations will provide protection against heartbleed
+ * like bugs where pieces of the heap is copied onto the wire.
+ *
+ * The more hardened implementations of the API will also do their best to
+ * prevent the memory from ending up in process dumps or being readable by
+ * debuggers.
+ *
+ * Finally, two functions are provided for scrambling the sensitive memory while
+ * it's not in use.
+ *
+ * @{
+ */
+
+/** @name RTMEMSAFER_F_XXX
+ * @{ */
+/** Require the memory to not hit the page file.
+ * @remarks Makes not guarantees with regards to hibernation /
+ *          suspend-to-disk. */
+#define RTMEMSAFER_F_REQUIRE_NOT_PAGABLE    RT_BIT_32(0)
+/** Mask of valid bits.  */
+#define RTMEMSAFER_F_VALID_MASK             UINT32_C(0x00000001)
+/** @} */
+
+/**
+ * Scrambles memory allocated by RTMemSaferAllocZEx and associates after use.
+ *
+ * Call this when the sensitive data isn't actively being used.  It will at a
+ * minimum make sure the data is slightly scrambled, how hard it is to unbutton
+ * is dependent on which implementation is used and available host support.
+ *
+ * The user must synchronize calls to RTMemSaferScramble and
+ * RTMemSaferUnscramble, this memory allocator provides no help and keeps no
+ * state information around.
+ *
+ * @returns IPRT status code.
+ * @param   pv          The pointer returned by the allocation function.
+ * @param   cb          The exact size given to the allocation function.
+ */
+RTDECL(int) RTMemSaferScramble(void *pv, size_t cb);
+
+/**
+ * Unscrambles memory allocated by RTMemSaferAllocZEx and associates before use.
+ *
+ * This undoes the effect of RTMemSaferScramble.
+ *
+ * @returns IPRT status code.
+ * @param   pv          The pointer returned by the allocation function.
+ * @param   cb          The exact size given to the allocation function.
+ */
+RTDECL(int) RTMemSaferUnscramble(void *pv, size_t cb);
+
+/**
+ * Allocates memory for sensitive data.
+ *
+ * Some effort will be taken to isolate the data from other memory allocation.
+ * Memory is always zeroed.
+ *
+ * @returns IPRT status code.
+ * @param   ppvNew      Where to return the pointer to the memory.
+ * @param   cb          Number of bytes to allocate.
+ * @param   fFlags      Flags for controlling the allocation, see
+ *                      RTMEMSAFER_F_XXX.
+ * @param   pszTag      Allocation tag used for statistics and such.
+ */
+RTDECL(int) RTMemSaferAllocZExTag(void **ppvNew, size_t cb, uint32_t fFlags, const char *pszTag) RT_NO_THROW_PROTO;
+
+/**
+ * Allocates memory for sensitive data.
+ *
+ * Some effort will be taken to isolate the data from other memory allocation.
+ * Memory is always zeroed.
+ *
+ * @returns IPRT status code.
+ * @param   a_ppvNew    Where to return the pointer to the memory.
+ * @param   a_cb        Number of bytes to allocate.
+ * @param   a_fFlags    Flags for controlling the allocation, see
+ *                      RTMEMSAFER_F_XXX.
+ */
+#define RTMemSaferAllocZEx(a_ppvNew, a_cb, a_fFlags) RTMemSaferAllocZExTag(a_ppvNew, a_cb, a_fFlags, RTMEM_TAG)
+
+/**
+ * Allocates memory for sensitive data.
+ *
+ * Some effort will be taken to isolate the data from other memory allocation.
+ * Memory is always zeroed.
+ *
+ * @returns Pointer to the allocated memory.
+ * @param   cb          Number of bytes to allocate.
+ * @param   pszTag      Allocation tag used for statistics and such.
+ */
+RTDECL(void *) RTMemSaferAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_PROTO;
+
+/**
+ * Allocates memory for sensitive data.
+ *
+ * Some effort will be taken to isolate the data from other memory allocation.
+ * Memory is always zeroed.
+ *
+ * @returns Pointer to the allocated memory.
+ * @param   a_cb        Number of bytes to allocate.
+ */
+#define RTMemSaferAllocZ(a_cb) RTMemSaferAllocZTag(a_cb, RTMEM_TAG)
+
+
+/**
+ * Reallocates memory allocated by RTMemSaferAllocZEx, RTMemSaferAllocZ,
+ * RTMemSaferAllocZExTag, or RTMemSaferAllocZTag.
+ *
+ * When extending the allocation, the new memory will be zeroed.  When shrinking
+ * the allocation the left over memory will be wiped clean using
+ * RTMemWipeThorougly.
+ *
+ * The function follows the standard realloc behavior.
+ *
+ * @returns IPRT status code.
+ * @param   cbOld       The current allocation size.
+ * @param   pvOld       The current allocation.
+ * @param   cbNew       The size of the new allocation.
+ * @param   ppvNew      Where to return the pointer to the new memory.
+ * @param   fFlags      Flags for controlling the allocation, see
+ *                      RTMEMSAFER_F_XXX.  It is not permitted to drop saftely
+ *                      requirments after the initial allocation.
+ * @param   pszTag      Allocation tag used for statistics and such.
+ */
+RTDECL(int) RTMemSaferReallocZExTag(size_t cbOld, void *pvOld, size_t cbNew, void **ppvNew, uint32_t fFlags, const char *pszTag) RT_NO_THROW_PROTO;
+
+/**
+ * Reallocates memory allocated by RTMemSaferAllocZEx, RTMemSaferAllocZ,
+ * RTMemSaferAllocZExTag, or RTMemSaferAllocZTag.
+ *
+ * When extending the allocation, the new memory will be zeroed.  When shrinking
+ * the allocation the left over memory will be wiped clean using
+ * RTMemWipeThorougly.
+ *
+ * The function follows the standard realloc behavior.
+ *
+ * @returns IPRT status code.
+ * @param   a_cbOld     The current allocation size.
+ * @param   a_pvOld     The current allocation.
+ * @param   a_cbNew     The size of the new allocation.
+ * @param   a_ppvNew    Where to return the pointer to the new memory.
+ * @param   a_fFlags    Flags for controlling the allocation. See RTMEMSAFER_ALLOC_EX_FLAGS_* defines,
+ *                      this takes only effect when allocating completely new memory, for extending or
+ *                      shrinking existing allocations the flags of the allocation take precedence.
+ */
+#define RTMemSaferReallocZEx(a_cbOld, a_pvOld, a_cbNew, a_ppvNew, a_fFlags) \
+    RTMemSaferReallocZExTag(a_cbOld, a_pvOld, a_cbNew, a_ppvNew, a_fFlags, RTMEM_TAG)
+
+/**
+ * Reallocates memory allocated by RTMemSaferAllocZ or RTMemSaferAllocZTag.
+ *
+ * When extending the allocation, the new memory will be zeroed.  When shrinking
+ * the allocation the left over memory will be wiped clean using
+ * RTMemWipeThorougly.
+ *
+ * The function follows the standard realloc behavior.
+ *
+ * @returns Pointer to the allocated memory.
+ * @param   cbOld       The current allocation size.
+ * @param   pvOld       The current allocation.
+ * @param   cbNew       The size of the new allocation.
+ * @param   pszTag      Allocation tag used for statistics and such.
+ */
+RTDECL(void *) RTMemSaferReallocZTag(size_t cbOld, void *pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW_PROTO;
+
+/**
+ * Reallocates memory allocated by RTMemSaferAllocZ or RTMemSaferAllocZTag.
+ *
+ * When extending the allocation, the new memory will be zeroed.  When shrinking
+ * the allocation the left over memory will be wiped clean using
+ * RTMemWipeThorougly.
+ *
+ * The function follows the standard realloc behavior.
+ *
+ * @returns Pointer to the allocated memory.
+ * @param   a_cbOld     The current allocation size.
+ * @param   a_pvOld     The current allocation.
+ * @param   a_cbNew     The size of the new allocation.
+ */
+#define RTMemSaferReallocZ(a_cbOld, a_pvOld, a_cbNew) RTMemSaferReallocZTag(a_cbOld, a_pvOld, a_cbNew, RTMEM_TAG)
+
+
+/**
+ * Frees memory allocated by RTMemSaferAllocZ* or RTMemSaferReallocZ*.
+ *
+ * Before freeing the allocated memory, it will be wiped clean using
+ * RTMemWipeThorougly.
+ *
+ * @returns Pointer to the allocated memory.
+ * @param   pv          The allocation.
+ * @param   cb          The allocation size.
+ */
+RTDECL(void) RTMemSaferFree(void *pv, size_t cb) RT_NO_THROW_PROTO;
+
+/** @}  */
+RT_C_DECLS_END
+
+#endif /* !IPRT_INCLUDED_memsafer_h */
+