8292994238
logging upon guest changing callback method (XSA-169) 5677f350-x86-make-debug-output-consistent-in-hvm_set_callback_via.patch - bsc#959387 - VUL-0: CVE-2015-8568 CVE-2015-8567: xen: qemu: net: vmxnet3: host memory leakage CVE-2015-8568-qemuu-net-vmxnet3-avoid-memory-leakage-in-activate_device.patch - bsc#957988 - VUL-0: CVE-2015-8550: xen: paravirtualized drivers incautious about shared memory contents (XSA-155) xsa155-xen-0001-xen-Add-RING_COPY_REQUEST.patch xsa155-xen-0002-blktap2-Use-RING_COPY_REQUEST.patch xsa155-xen-0003-libvchan-Read-prod-cons-only-once.patch xsa155-qemuu-qdisk-double-access.patch xsa155-qemut-qdisk-double-access.patch xsa155-qemuu-xenfb.patch xsa155-qemut-xenfb.patch - bsc#959006 - VUL-0: CVE-2015-8558: xen: qemu: usb: infinite loop in ehci_advance_state results in DoS CVE-2015-8558-qemuu-usb-infinite-loop-in-ehci_advance_state-results-in-DoS.patch - bsc#958918 - VUL-0: CVE-2015-7549: xen: qemu pci: null pointer dereference issue CVE-2015-7549-qemuu-pci-null-pointer-dereference-issue.patch - bsc#958493 - VUL-0: CVE-2015-8504: xen: qemu: ui: vnc: avoid floating point exception CVE-2015-8504-qemuu-vnc-avoid-floating-point-exception.patch CVE-2015-8504-qemut-vnc-avoid-floating-point-exception.patch - bsc#958007 - VUL-0: CVE-2015-8554: xen: qemu-dm buffer overrun in MSI-X handling (XSA-164) xsa164.patch OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=393
50 lines
1.7 KiB
Diff
50 lines
1.7 KiB
Diff
References: bsc#957988
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From 0ffd4547665d2fec648ab2c9ff856c5d9db9b07c Mon Sep 17 00:00:00 2001
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From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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Date: Fri, 20 Nov 2015 10:37:08 -0500
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Subject: [PATCH 2/2] xenfb: avoid reading twice the same fields from the
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shared page
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Reading twice the same field could give the guest an attack of
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opportunity. In the case of event->type, gcc could compile the switch
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statement into a jump table, effectively ending up reading the type
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field multiple times.
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This is part of XSA-155.
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Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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---
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hw/xenfb.c | 10 ++++++----
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1 file changed, 6 insertions(+), 4 deletions(-)
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Index: xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/xenfb.c
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===================================================================
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--- xen-4.6.0-testing.orig/tools/qemu-xen-traditional-dir-remote/hw/xenfb.c
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+++ xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/xenfb.c
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@@ -827,18 +827,20 @@ static void xenfb_invalidate(void *opaqu
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static void xenfb_handle_events(struct XenFB *xenfb)
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{
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- uint32_t prod, cons;
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+ uint32_t prod, cons, out_cons;
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struct xenfb_page *page = xenfb->c.page;
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prod = page->out_prod;
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- if (prod == page->out_cons)
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+ out_cons = page->out_cons;
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+ if (prod == out_cons)
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return;
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xen_rmb(); /* ensure we see ring contents up to prod */
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- for (cons = page->out_cons; cons != prod; cons++) {
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+ for (cons = out_cons; cons != prod; cons++) {
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union xenfb_out_event *event = &XENFB_OUT_RING_REF(page, cons);
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+ uint8_t type = event->type;
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int x, y, w, h;
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- switch (event->type) {
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+ switch (type) {
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case XENFB_TYPE_UPDATE:
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if (xenfb->up_count == UP_QUEUE)
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xenfb->up_fullscreen = 1;
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