59 lines
2.0 KiB
Diff
59 lines
2.0 KiB
Diff
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From 621808c6c4da3adcc073231493d487d6360386c9 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 09/21] lsi53c895a: disable reentrancy detection for script RAM
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 165: memory: prevent dma-reentracy issues
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RH-Jira: RHEL-516
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [5/13] 765d65fc3fb735eb4b52a408ccff91b538ad32b6 (jmaloy/jmaloy-qemu-kvm-2)
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Jira: https://issues.redhat.com/browse/RHEL-516
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Upstream: Merged
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CVE: CVE-2023-2680
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commit bfd6e7ae6a72b84e2eb9574f56e6ec037f05182c
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Author: Alexander Bulekov <alxndr@bu.edu>
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Date: Thu Apr 27 17:10:10 2023 -0400
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lsi53c895a: disable reentrancy detection for script RAM
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As the code is designed to use the memory APIs to access the script ram,
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disable reentrancy checks for the pseudo-RAM ram_io MemoryRegion.
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In the future, ram_io may be converted from an IO to a proper RAM MemoryRegion.
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Reported-by: Fiona Ebner <f.ebner@proxmox.com>
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Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
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Reviewed-by: Thomas Huth <thuth@redhat.com>
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Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
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Message-Id: <20230427211013.2994127-6-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/scsi/lsi53c895a.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
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index af93557a9a..db27872963 100644
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--- a/hw/scsi/lsi53c895a.c
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+++ b/hw/scsi/lsi53c895a.c
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@@ -2302,6 +2302,12 @@ static void lsi_scsi_realize(PCIDevice *dev, Error **errp)
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memory_region_init_io(&s->io_io, OBJECT(s), &lsi_io_ops, s,
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"lsi-io", 256);
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+ /*
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+ * Since we use the address-space API to interact with ram_io, disable the
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+ * re-entrancy guard.
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+ */
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+ s->ram_io.disable_reentrancy_guard = true;
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+
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address_space_init(&s->pci_io_as, pci_address_space_io(dev), "lsi-pci-io");
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qdev_init_gpio_out(d, &s->ext_irq, 1);
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--
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2.39.3
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