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commit b07505993dd8b2f367cf3b630f6da186e4e8550d
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Author: Ingo Franzki <ifranzki@linux.ibm.com>
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Date: Wed Feb 10 15:12:25 2021 +0100
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Avoid deadlock in dlclose() after a fork
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Calling dlclose() in a atfork handler may cause a deadlock.
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dlclose() may itself modify the atfork handler table to remove
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any fork handlers that the to be unloaded library has registered.
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Since the atfork handler table is currently locked when we are in
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an atfork handler, this would produce a deadlock.
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Skip the dlclose() if we are in an atfork handler to avoid the deadlock.
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Signed-off-by: Ingo Franzki <ifranzki@linux.ibm.com>
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diff --git a/usr/lib/api/api_interface.c b/usr/lib/api/api_interface.c
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index 3ccb6d41..f1ee9132 100644
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--- a/usr/lib/api/api_interface.c
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+++ b/usr/lib/api/api_interface.c
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@@ -1516,7 +1516,15 @@ CK_RV C_Finalize(CK_VOID_PTR pReserved)
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}
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}
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- DL_UnLoad(sltp, slotID);
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+ /*
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+ * Calling dlclose() in a atfork handler may cause a deadlock.
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+ * dlclose() may itself modify the atfork handler table to remove
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+ * any fork handlers that the to be unloaded library has registered.
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+ * Since the atfork handler table is currently locked when we are in
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+ * an atfork handler, this would produce a deadlock.
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+ */
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+ if (!in_child_fork_initializer)
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+ DL_UnLoad(sltp, slotID);
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}
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// Un register from Slot D
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