mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-12-26 22:38:07 -05:00
fef3cfaaab
* gnu/packages/patches/qemu-CVE-2015-4037.patch, gnu/packages/patches/qemu-CVE-2015-4103.patch, gnu/packages/patches/qemu-CVE-2015-4104.patch, gnu/packages/patches/qemu-CVE-2015-4105.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt1.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt2.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt3.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt4.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt5.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt6.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt7.patch, gnu/packages/patches/qemu-CVE-2015-4106-pt8.patch: New files. * gnu-system.am (dist_patch_DATA): Add them. * gnu/packages/qemu.scm (qemu-headless)[source]: Add patches.
85 lines
3.3 KiB
Diff
85 lines
3.3 KiB
Diff
From b38ec5ee7a581776bbce0bdaecb397632c3c4791 Mon Sep 17 00:00:00 2001
|
|
From: Jan Beulich <jbeulich@suse.com>
|
|
Date: Tue, 2 Jun 2015 15:07:00 +0000
|
|
Subject: [PATCH] xen/MSI-X: limit error messages
|
|
|
|
Limit error messages resulting from bad guest behavior to avoid allowing
|
|
the guest to cause the control domain's disk to fill.
|
|
|
|
The first message in pci_msix_write() can simply be deleted, as this
|
|
is indeed bad guest behavior, but such out of bounds writes don't
|
|
really need to be logged.
|
|
|
|
The second one is more problematic, as there guest behavior may only
|
|
appear to be wrong: For one, the old logic didn't take the mask-all bit
|
|
into account. And then this shouldn't depend on host device state (i.e.
|
|
the host may have masked the entry without the guest having done so).
|
|
Plus these writes shouldn't be dropped even when an entry is unmasked.
|
|
Instead, if they can't be made take effect right away, they should take
|
|
effect on the next unmasking or enabling operation - the specification
|
|
explicitly describes such caching behavior. Until we can validly drop
|
|
the message (implementing such caching/latching behavior), issue the
|
|
message just once per MSI-X table entry.
|
|
|
|
Note that the log message in pci_msix_read() similar to the one being
|
|
removed here is not an issue: "addr" being of unsigned type, and the
|
|
maximum size of the MSI-X table being 32k, entry_nr simply can't be
|
|
negative and hence the conditonal guarding issuing of the message will
|
|
never be true.
|
|
|
|
This is XSA-130.
|
|
|
|
Signed-off-by: Jan Beulich <jbeulich@suse.com>
|
|
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
|
|
---
|
|
hw/xen/xen_pt.h | 1 +
|
|
hw/xen/xen_pt_msi.c | 12 +++++++-----
|
|
2 files changed, 8 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/hw/xen/xen_pt.h b/hw/xen/xen_pt.h
|
|
index 52ceb85..8c9b6c2 100644
|
|
--- a/hw/xen/xen_pt.h
|
|
+++ b/hw/xen/xen_pt.h
|
|
@@ -175,6 +175,7 @@ typedef struct XenPTMSIXEntry {
|
|
uint32_t data;
|
|
uint32_t vector_ctrl;
|
|
bool updated; /* indicate whether MSI ADDR or DATA is updated */
|
|
+ bool warned; /* avoid issuing (bogus) warning more than once */
|
|
} XenPTMSIXEntry;
|
|
typedef struct XenPTMSIX {
|
|
uint32_t ctrl_offset;
|
|
diff --git a/hw/xen/xen_pt_msi.c b/hw/xen/xen_pt_msi.c
|
|
index 9ed9321..68db623 100644
|
|
--- a/hw/xen/xen_pt_msi.c
|
|
+++ b/hw/xen/xen_pt_msi.c
|
|
@@ -434,11 +434,10 @@ static void pci_msix_write(void *opaque, hwaddr addr,
|
|
XenPCIPassthroughState *s = opaque;
|
|
XenPTMSIX *msix = s->msix;
|
|
XenPTMSIXEntry *entry;
|
|
- int entry_nr, offset;
|
|
+ unsigned int entry_nr, offset;
|
|
|
|
entry_nr = addr / PCI_MSIX_ENTRY_SIZE;
|
|
- if (entry_nr < 0 || entry_nr >= msix->total_entries) {
|
|
- XEN_PT_ERR(&s->dev, "asked MSI-X entry '%i' invalid!\n", entry_nr);
|
|
+ if (entry_nr >= msix->total_entries) {
|
|
return;
|
|
}
|
|
entry = &msix->msix_entry[entry_nr];
|
|
@@ -460,8 +459,11 @@ static void pci_msix_write(void *opaque, hwaddr addr,
|
|
+ PCI_MSIX_ENTRY_VECTOR_CTRL;
|
|
|
|
if (msix->enabled && !(*vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)) {
|
|
- XEN_PT_ERR(&s->dev, "Can't update msix entry %d since MSI-X is"
|
|
- " already enabled.\n", entry_nr);
|
|
+ if (!entry->warned) {
|
|
+ entry->warned = true;
|
|
+ XEN_PT_ERR(&s->dev, "Can't update msix entry %d since MSI-X is"
|
|
+ " already enabled.\n", entry_nr);
|
|
+ }
|
|
return;
|
|
}
|
|
|
|
--
|
|
2.2.1
|
|
|