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57 lines
1.9 KiB
57 lines
1.9 KiB
9 months ago
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From 47d027147694fde94dd73305ee53b6a136cbeced 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 08/15] apic: disable reentrancy detection for apic-msi
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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: [8/12] 25c3cf99b00cd9adc10d6e7afa9c3e3b7da08de2 (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 50795ee051a342c681a9b45671c552fbd6274db8
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Author: Alexander Bulekov <alxndr@bu.edu>
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Date: Thu Apr 27 17:10:13 2023 -0400
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apic: disable reentrancy detection for apic-msi
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As the code is designed for re-entrant calls to apic-msi, mark apic-msi
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as reentrancy-safe.
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Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
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Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
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Message-Id: <20230427211013.2994127-9-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/intc/apic.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/intc/apic.c b/hw/intc/apic.c
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index 3df11c34d6..a7c2b301a8 100644
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--- a/hw/intc/apic.c
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+++ b/hw/intc/apic.c
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@@ -883,6 +883,13 @@ static void apic_realize(DeviceState *dev, Error **errp)
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memory_region_init_io(&s->io_memory, OBJECT(s), &apic_io_ops, s, "apic-msi",
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APIC_SPACE_SIZE);
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+ /*
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+ * apic-msi's apic_mem_write can call into ioapic_eoi_broadcast, which can
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+ * write back to apic-msi. As such mark the apic-msi region re-entrancy
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+ * safe.
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+ */
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+ s->io_memory.disable_reentrancy_guard = true;
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+
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s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, apic_timer, s);
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local_apics[s->id] = s;
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--
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2.37.3
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