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From 16f994e7944a917fa81c8db11c56c594f4e78b40 Mon Sep 17 00:00:00 2001
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From: Alexander Bokovoy <abokovoy@redhat.com>
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Date: Tue, 31 Jul 2018 14:59:03 +0300
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Subject: [PATCH] Reset mutex callbacks to the default version when finished
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If a PKCS11 API caller provided own mutex handling callbacks,
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we need to ensure they aren't used after C_Finalize is called
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and SoftHSM instance is recycled.
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Inability to do so may lead to a situation where callbacks might
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be provided by a different dynamically loaded object which is removed
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after C_Finalize() call. Thus, callback pointers become invalid and
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calling them leads to crashes.
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Fixes: https://github.com/opendnssec/SoftHSMv2/issues/408
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Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
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---
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src/lib/SoftHSM.cpp | 16 ++++++++++++----
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1 file changed, 12 insertions(+), 4 deletions(-)
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diff --git a/src/lib/SoftHSM.cpp b/src/lib/SoftHSM.cpp
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index ee94d3f..e4cc044 100644
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--- a/src/lib/SoftHSM.cpp
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+++ b/src/lib/SoftHSM.cpp
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@@ -314,6 +314,15 @@ static CK_ATTRIBUTE bsAttribute(CK_ATTRIBUTE_TYPE type, const ByteString &value)
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/*****************************************************************************
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Implementation of SoftHSM class specific functions
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*****************************************************************************/
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+static void resetMutexFactoryCallbacks()
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+{
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+ // Reset MutexFactory callbacks to our versions
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+ MutexFactory::i()->setCreateMutex(OSCreateMutex);
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+ MutexFactory::i()->setDestroyMutex(OSDestroyMutex);
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+ MutexFactory::i()->setLockMutex(OSLockMutex);
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+ MutexFactory::i()->setUnlockMutex(OSUnlockMutex);
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+}
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+
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// Return the one-and-only instance
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SoftHSM* SoftHSM::i()
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@@ -342,6 +351,7 @@ SoftHSM::SoftHSM()
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slotManager = NULL;
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sessionManager = NULL;
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handleManager = NULL;
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+ resetMutexFactoryCallbacks();
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}
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// Destructor
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@@ -352,6 +362,7 @@ SoftHSM::~SoftHSM()
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if (slotManager != NULL) delete slotManager;
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if (objectStore != NULL) delete objectStore;
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if (sessionObjectStore != NULL) delete sessionObjectStore;
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+ resetMutexFactoryCallbacks();
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}
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/*****************************************************************************
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@@ -402,10 +413,7 @@ CK_RV SoftHSM::C_Initialize(CK_VOID_PTR pInitArgs)
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if (args->flags & CKF_OS_LOCKING_OK)
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{
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// Use our own mutex functions.
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- MutexFactory::i()->setCreateMutex(OSCreateMutex);
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- MutexFactory::i()->setDestroyMutex(OSDestroyMutex);
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- MutexFactory::i()->setLockMutex(OSLockMutex);
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- MutexFactory::i()->setUnlockMutex(OSUnlockMutex);
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+ resetMutexFactoryCallbacks();
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MutexFactory::i()->enable();
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}
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else
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--
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2.17.1
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