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[Qemu-devel] [PATCH V2 1/4] vmxnet3: validate interrupt indices coming f
From: |
Dmitry Fleytman |
Subject: |
[Qemu-devel] [PATCH V2 1/4] vmxnet3: validate interrupt indices coming from guest |
Date: |
Fri, 4 Apr 2014 12:45:19 +0300 |
CVE-2013-4544
Signed-off-by: Dmitry Fleytman <address@hidden>
Reported-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
hw/net/vmxnet3.c | 36 ++++++++++++++++++++++++++++++++++--
1 file changed, 34 insertions(+), 2 deletions(-)
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index 5be807c..0b317f8 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -52,6 +52,9 @@
#define VMXNET3_DEVICE_VERSION 0x1
#define VMXNET3_DEVICE_REVISION 0x1
+/* Number of interrupt vectors for non-MSIx modes */
+#define VMXNET3_MAX_NMSIX_INTRS (1)
+
/* Macros for rings descriptors access */
#define VMXNET3_READ_TX_QUEUE_DESCR8(dpa, field) \
(vmw_shmem_ld8(dpa + offsetof(struct Vmxnet3_TxQueueDesc, field)))
@@ -1305,6 +1308,34 @@ static bool vmxnet3_verify_intx(VMXNET3State *s, int
intx)
(pci_get_byte(s->parent_obj.config + PCI_INTERRUPT_PIN) - 1));
}
+static void vmxnet3_validate_interrupt_idx(bool is_msix, int idx)
+{
+ int max_ints = is_msix ? VMXNET3_MAX_INTRS : VMXNET3_MAX_NMSIX_INTRS;
+ if (idx >= max_ints) {
+ hw_error("Bad interrupt index: %d\n", idx);
+ }
+}
+
+static void vmxnet3_validate_interrupts(VMXNET3State *s)
+{
+ int i;
+
+ VMW_CFPRN("Verifying event interrupt index (%d)", s->event_int_idx);
+ vmxnet3_validate_interrupt_idx(s->msix_used, s->event_int_idx);
+
+ for (i = 0; i < s->txq_num; i++) {
+ int idx = s->txq_descr[i].intr_idx;
+ VMW_CFPRN("Verifying TX queue %d interrupt index (%d)", i, idx);
+ vmxnet3_validate_interrupt_idx(s->msix_used, idx);
+ }
+
+ for (i = 0; i < s->rxq_num; i++) {
+ int idx = s->rxq_descr[i].intr_idx;
+ VMW_CFPRN("Verifying RX queue %d interrupt index (%d)", i, idx);
+ vmxnet3_validate_interrupt_idx(s->msix_used, idx);
+ }
+}
+
static void vmxnet3_activate_device(VMXNET3State *s)
{
int i;
@@ -1447,6 +1478,8 @@ static void vmxnet3_activate_device(VMXNET3State *s)
sizeof(s->rxq_descr[i].rxq_stats));
}
+ vmxnet3_validate_interrupts(s);
+
/* Make sure everything is in place before device activation */
smp_wmb();
@@ -2005,7 +2038,6 @@ vmxnet3_cleanup_msix(VMXNET3State *s)
}
}
-#define VMXNET3_MSI_NUM_VECTORS (1)
#define VMXNET3_MSI_OFFSET (0x50)
#define VMXNET3_USE_64BIT (true)
#define VMXNET3_PER_VECTOR_MASK (false)
@@ -2016,7 +2048,7 @@ vmxnet3_init_msi(VMXNET3State *s)
PCIDevice *d = PCI_DEVICE(s);
int res;
- res = msi_init(d, VMXNET3_MSI_OFFSET, VMXNET3_MSI_NUM_VECTORS,
+ res = msi_init(d, VMXNET3_MSI_OFFSET, VMXNET3_MAX_NMSIX_INTRS,
VMXNET3_USE_64BIT, VMXNET3_PER_VECTOR_MASK);
if (0 > res) {
VMW_WRPRN("Failed to initialize MSI, error %d", res);
--
1.8.5.3