import qemu-kvm-4.2.0-59.module+el8.5.0+13495+8166cdf8.1
This commit is contained in:
CentOS Sources
Stepan Oksanichenko
parent
18777481c4
commit
4cb2a81ea6
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From fc0bca7bd2685b8f8e3c37f19ce74967870ef952 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Thu, 21 Oct 2021 12:10:47 -0400
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Subject: [PATCH 2/2] e1000: fix tx re-entrancy problem
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 73: e1000: fix tx re-entrancy problem
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RH-Commit: [1/1] 3088ea275ddcee1ba0d47f7cff195af3e256f15f (jmaloy/qemu-kvm)
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RH-Bugzilla: 2025011
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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The fact that the MMIO handler is not re-entrant causes an infinite
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loop under certain conditions:
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Guest write to TDT -> Loopback -> RX (DMA to TDT) -> TX
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We now eliminate the effect of this problem locally in e1000, by adding
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a boolean in struct E1000State indicating when the TX side is busy. This
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will cause any entering new call to return early instead of interfering
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with the ongoing work, and eliminates any risk of looping.
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This is intended to address CVE-2021-20257.
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit 25ddb946e6301f42cff3094ea1c25fb78813e7e9)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/net/e1000.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/net/e1000.c b/hw/net/e1000.c
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index 8680b7d46b..1963a5b243 100644
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--- a/hw/net/e1000.c
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+++ b/hw/net/e1000.c
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@@ -105,6 +105,7 @@ typedef struct E1000State_st {
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e1000x_txd_props props;
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e1000x_txd_props tso_props;
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uint16_t tso_frames;
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+ bool busy;
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} tx;
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struct {
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@@ -749,6 +750,11 @@ start_xmit(E1000State *s)
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return;
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}
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+ if (s->tx.busy) {
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+ return;
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+ }
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+ s->tx.busy = true;
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+
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while (s->mac_reg[TDH] != s->mac_reg[TDT]) {
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base = tx_desc_base(s) +
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sizeof(struct e1000_tx_desc) * s->mac_reg[TDH];
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@@ -775,6 +781,7 @@ start_xmit(E1000State *s)
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break;
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}
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}
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+ s->tx.busy = false;
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set_ics(s, 0, cause);
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}
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--
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2.27.0
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@ -0,0 +1,61 @@
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From 60b05771b8afc08e0ca9956658d2c55cd1739652 Mon Sep 17 00:00:00 2001
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From: Mauro Matteo Cascella <mcascell@redhat.com>
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Date: Thu, 4 Nov 2021 17:31:38 +0100
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Subject: [PATCH 1/2] hw/scsi/scsi-disk: MODE_PAGE_ALLS not allowed in MODE
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SELECT commands
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 70: hw/scsi/scsi-disk: MODE_PAGE_ALLS not allowed in MODE SELECT commands
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RH-Commit: [1/1] bd3de8bdf48aa6c522612505d08c23dafb122a34 (jmaloy/qemu-kvm)
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RH-Bugzilla: 2025605
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RH-Acked-by: Paolo Bonzini <None>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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This avoids an off-by-one read of 'mode_sense_valid' buffer in
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hw/scsi/scsi-disk.c:mode_sense_page().
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Fixes: CVE-2021-3930
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Cc: qemu-stable@nongnu.org
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Reported-by: Alexander Bulekov <alxndr@bu.edu>
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Fixes: a8f4bbe2900 ("scsi-disk: store valid mode pages in a table")
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Fixes: #546
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Reported-by: Qiuhao Li <Qiuhao.Li@outlook.com>
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Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit b3af7fdf9cc537f8f0dd3e2423d83f5c99a457e8)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/scsi/scsi-disk.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
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index 5cb5fd35bd..1d0ea72289 100644
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--- a/hw/scsi/scsi-disk.c
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+++ b/hw/scsi/scsi-disk.c
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@@ -1086,6 +1086,7 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
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uint8_t *p = *p_outbuf + 2;
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int length;
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+ assert(page < ARRAY_SIZE(mode_sense_valid));
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if ((mode_sense_valid[page] & (1 << s->qdev.type)) == 0) {
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return -1;
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}
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@@ -1427,6 +1428,11 @@ static int scsi_disk_check_mode_select(SCSIDiskState *s, int page,
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return -1;
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}
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+ /* MODE_PAGE_ALLS is only valid for MODE SENSE commands */
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+ if (page == MODE_PAGE_ALLS) {
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+ return -1;
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+ }
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+
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p = mode_current;
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memset(mode_current, 0, inlen + 2);
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len = mode_sense_page(s, page, &p, 0);
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--
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2.27.0
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@ -67,7 +67,7 @@ Obsoletes: %1-rhev <= %{epoch}:%{version}-%{release}
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Summary: QEMU is a machine emulator and virtualizer
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Name: qemu-kvm
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Version: 4.2.0
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Release: 59%{?dist}
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Release: 59%{?dist}.1
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# Epoch because we pushed a qemu-1.0 package. AIUI this can't ever be dropped
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Epoch: 15
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License: GPLv2 and GPLv2+ and CC-BY
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@ -1248,6 +1248,10 @@ Patch542: kvm-virtiofsd-Disable-remote-posix-locks-by-default.patch
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Patch543: kvm-virtiofsd-Fix-the-help-message-of-posix-lock.patch
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# For bz#1994041 - qemu-kvm scsi: change default passthrough timeout to non-infinite
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Patch544: kvm-scsi-make-io_timeout-configurable.patch
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# For bz#2025605 - CVE-2021-3930 virt:rhel/qemu-kvm: QEMU: off-by-one error in mode_sense_page() in hw/scsi/scsi-disk.c [rhel-8.5.0.z]
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Patch545: kvm-hw-scsi-scsi-disk-MODE_PAGE_ALLS-not-allowed-in-MODE.patch
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# For bz#2025011 - CVE-2021-20257 virt:rhel/qemu-kvm: QEMU: net: e1000: infinite loop while processing transmit descriptors [rhel-8.5.0.z]
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Patch546: kvm-e1000-fix-tx-re-entrancy-problem.patch
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BuildRequires: wget
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BuildRequires: rpm-build
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@ -2196,6 +2200,14 @@ useradd -r -u 107 -g qemu -G kvm -d / -s /sbin/nologin \
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%changelog
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* Thu Nov 25 2021 Jon Maloy <jmaloy@redhat.com> - 4.2.0-59.el8_5
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- kvm-hw-scsi-scsi-disk-MODE_PAGE_ALLS-not-allowed-in-MODE.patch [bz#2025605]
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- kvm-e1000-fix-tx-re-entrancy-problem.patch [bz#2025011]
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- Resolves: bz#2025605
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(CVE-2021-3930 virt:rhel/qemu-kvm: QEMU: off-by-one error in mode_sense_page() in hw/scsi/scsi-disk.c [rhel-8.5.0.z])
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- Resolves: bz#2025011
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(CVE-2021-20257 virt:rhel/qemu-kvm: QEMU: net: e1000: infinite loop while processing transmit descriptors [rhel-8.5.0.z])
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* Fri Oct 01 2021 Jon Maloy <jmaloy@redhat.com> - 4.2.0-59
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- kvm-scsi-make-io_timeout-configurable.patch [bz#1994041]
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- Resolves: bz#1994041
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