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59 lines
2.0 KiB
59 lines
2.0 KiB
1 year ago
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From 7715635d018351e0a5c4c25aec2c71a2fe3b9e69 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 06/15] bcm2835_property: disable reentrancy detection for
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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: [6/12] 4d6187430ca1c4309a36824c0c6815d2a763db1a (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 985c4a4e547afb9573b6bd6843d20eb2c3d1d1cd
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Author: Alexander Bulekov <alxndr@bu.edu>
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Date: Thu Apr 27 17:10:11 2023 -0400
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bcm2835_property: disable reentrancy detection for iomem
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As the code is designed for re-entrant calls from bcm2835_property to
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bcm2835_mbox and back into bcm2835_property, mark iomem as
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reentrancy-safe.
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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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Message-Id: <20230427211013.2994127-7-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/misc/bcm2835_property.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/misc/bcm2835_property.c b/hw/misc/bcm2835_property.c
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index 73941bdae9..022b5a849c 100644
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--- a/hw/misc/bcm2835_property.c
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+++ b/hw/misc/bcm2835_property.c
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@@ -377,6 +377,13 @@ static void bcm2835_property_init(Object *obj)
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memory_region_init_io(&s->iomem, OBJECT(s), &bcm2835_property_ops, s,
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TYPE_BCM2835_PROPERTY, 0x10);
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+
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+ /*
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+ * bcm2835_property_ops call into bcm2835_mbox, which in-turn reads from
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+ * iomem. As such, mark iomem as re-entracy safe.
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+ */
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+ s->iomem.disable_reentrancy_guard = true;
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+
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sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
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sysbus_init_irq(SYS_BUS_DEVICE(s), &s->mbox_irq);
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}
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--
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2.37.3
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