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56 lines
2.0 KiB
56 lines
2.0 KiB
9 months ago
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From c5cb3e97098834f9cf12b6c5260d9b43d68d64eb Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Tue, 9 May 2023 10:29:03 -0400
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Subject: [PATCH 07/15] raven: disable reentrancy detection for iomem
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 277: memory: prevent dma-reentracy issues
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RH-Bugzilla: 1999236
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [7/12] f41983390acba68043d386be090172dd17a5e58c (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1999236
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Upstream: Merged
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CVE: CVE-2021-3750
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commit 6dad5a6810d9c60ca320d01276f6133bbcfa1fc7
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Author: Alexander Bulekov <alxndr@bu.edu>
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Date: Thu Apr 27 17:10:12 2023 -0400
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raven: disable reentrancy detection for iomem
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As the code is designed for re-entrant calls from raven_io_ops to
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pci-conf, mark raven_io_ops as reentrancy-safe.
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Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
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Message-Id: <20230427211013.2994127-8-alxndr@bu.edu>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/pci-host/raven.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/pci-host/raven.c b/hw/pci-host/raven.c
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index 6e514f75eb..245b1653e4 100644
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--- a/hw/pci-host/raven.c
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+++ b/hw/pci-host/raven.c
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@@ -294,6 +294,13 @@ static void raven_pcihost_initfn(Object *obj)
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memory_region_init(&s->pci_memory, obj, "pci-memory", 0x3f000000);
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address_space_init(&s->pci_io_as, &s->pci_io, "raven-io");
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+ /*
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+ * Raven's raven_io_ops use the address-space API to access pci-conf-idx
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+ * (which is also owned by the raven device). As such, mark the
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+ * pci_io_non_contiguous as re-entrancy safe.
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+ */
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+ s->pci_io_non_contiguous.disable_reentrancy_guard = true;
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+
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/* CPU address space */
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memory_region_add_subregion(address_space_mem, PCI_IO_BASE_ADDR,
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&s->pci_io);
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--
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2.37.3
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