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authorLinus Torvalds <torvalds@linux-foundation.org>2016-11-26 12:18:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-11-26 12:18:59 -0800
commitfc13ca191ee2ae5f379e2933cdff523c3b4fffc9 (patch)
treeb62beebc6b8160c57c241c6288cdfe35f9c5e122
parent39c1573748166b348117d6bf161ceffce90e734f (diff)
parentdf492896e6dfb44fd1154f5402428d8e52705081 (diff)
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull KVM fixes from Radim Krčmář: "Four fixes for bugs found by syzkaller on x86, all for stable" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: x86: check for pic and ioapic presence before use KVM: x86: fix out-of-bounds accesses of rtc_eoi map KVM: x86: drop error recovery in em_jmp_far and em_ret_far KVM: x86: fix out-of-bounds access in lapic
-rw-r--r--arch/x86/kvm/emulate.c36
-rw-r--r--arch/x86/kvm/ioapic.c2
-rw-r--r--arch/x86/kvm/ioapic.h4
-rw-r--r--arch/x86/kvm/irq_comm.c13
-rw-r--r--arch/x86/kvm/lapic.c2
5 files changed, 28 insertions, 29 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index cbd7b92585bb..a3ce9d260d68 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2105,16 +2105,10 @@ static int em_iret(struct x86_emulate_ctxt *ctxt)
static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
{
int rc;
- unsigned short sel, old_sel;
- struct desc_struct old_desc, new_desc;
- const struct x86_emulate_ops *ops = ctxt->ops;
+ unsigned short sel;
+ struct desc_struct new_desc;
u8 cpl = ctxt->ops->cpl(ctxt);
- /* Assignment of RIP may only fail in 64-bit mode */
- if (ctxt->mode == X86EMUL_MODE_PROT64)
- ops->get_segment(ctxt, &old_sel, &old_desc, NULL,
- VCPU_SREG_CS);
-
memcpy(&sel, ctxt->src.valptr + ctxt->op_bytes, 2);
rc = __load_segment_descriptor(ctxt, sel, VCPU_SREG_CS, cpl,
@@ -2124,12 +2118,10 @@ static int em_jmp_far(struct x86_emulate_ctxt *ctxt)
return rc;
rc = assign_eip_far(ctxt, ctxt->src.val, &new_desc);
- if (rc != X86EMUL_CONTINUE) {
- WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64);
- /* assigning eip failed; restore the old cs */
- ops->set_segment(ctxt, old_sel, &old_desc, 0, VCPU_SREG_CS);
- return rc;
- }
+ /* Error handling is not implemented. */
+ if (rc != X86EMUL_CONTINUE)
+ return X86EMUL_UNHANDLEABLE;
+
return rc;
}
@@ -2189,14 +2181,8 @@ static int em_ret_far(struct x86_emulate_ctxt *ctxt)
{
int rc;
unsigned long eip, cs;
- u16 old_cs;
int cpl = ctxt->ops->cpl(ctxt);
- struct desc_struct old_desc, new_desc;
- const struct x86_emulate_ops *ops = ctxt->ops;
-
- if (ctxt->mode == X86EMUL_MODE_PROT64)
- ops->get_segment(ctxt, &old_cs, &old_desc, NULL,
- VCPU_SREG_CS);
+ struct desc_struct new_desc;
rc = emulate_pop(ctxt, &eip, ctxt->op_bytes);
if (rc != X86EMUL_CONTINUE)
@@ -2213,10 +2199,10 @@ static int em_ret_far(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
return rc;
rc = assign_eip_far(ctxt, eip, &new_desc);
- if (rc != X86EMUL_CONTINUE) {
- WARN_ON(ctxt->mode != X86EMUL_MODE_PROT64);
- ops->set_segment(ctxt, old_cs, &old_desc, 0, VCPU_SREG_CS);
- }
+ /* Error handling is not implemented. */
+ if (rc != X86EMUL_CONTINUE)
+ return X86EMUL_UNHANDLEABLE;
+
return rc;
}
diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c
index 1a22de70f7f7..6e219e5c07d2 100644
--- a/arch/x86/kvm/ioapic.c
+++ b/arch/x86/kvm/ioapic.c
@@ -94,7 +94,7 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic)
{
ioapic->rtc_status.pending_eoi = 0;
- bitmap_zero(ioapic->rtc_status.dest_map.map, KVM_MAX_VCPUS);
+ bitmap_zero(ioapic->rtc_status.dest_map.map, KVM_MAX_VCPU_ID);
}
static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic);
diff --git a/arch/x86/kvm/ioapic.h b/arch/x86/kvm/ioapic.h
index 7d2692a49657..1cc6e54436db 100644
--- a/arch/x86/kvm/ioapic.h
+++ b/arch/x86/kvm/ioapic.h
@@ -42,13 +42,13 @@ struct kvm_vcpu;
struct dest_map {
/* vcpu bitmap where IRQ has been sent */
- DECLARE_BITMAP(map, KVM_MAX_VCPUS);
+ DECLARE_BITMAP(map, KVM_MAX_VCPU_ID);
/*
* Vector sent to a given vcpu, only valid when
* the vcpu's bit in map is set
*/
- u8 vectors[KVM_MAX_VCPUS];
+ u8 vectors[KVM_MAX_VCPU_ID];
};
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 4da03030d5a7..6c0191615f23 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -41,6 +41,15 @@ static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
bool line_status)
{
struct kvm_pic *pic = pic_irqchip(kvm);
+
+ /*
+ * XXX: rejecting pic routes when pic isn't in use would be better,
+ * but the default routing table is installed while kvm->arch.vpic is
+ * NULL and KVM_CREATE_IRQCHIP can race with KVM_IRQ_LINE.
+ */
+ if (!pic)
+ return -1;
+
return kvm_pic_set_irq(pic, e->irqchip.pin, irq_source_id, level);
}
@@ -49,6 +58,10 @@ static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e,
bool line_status)
{
struct kvm_ioapic *ioapic = kvm->arch.vioapic;
+
+ if (!ioapic)
+ return -1;
+
return kvm_ioapic_set_irq(ioapic, e->irqchip.pin, irq_source_id, level,
line_status);
}
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 23b99f305382..6f69340f9fa3 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -138,7 +138,7 @@ static inline bool kvm_apic_map_get_logical_dest(struct kvm_apic_map *map,
*mask = dest_id & 0xff;
return true;
case KVM_APIC_MODE_XAPIC_CLUSTER:
- *cluster = map->xapic_cluster_map[dest_id >> 4];
+ *cluster = map->xapic_cluster_map[(dest_id >> 4) & 0xf];
*mask = dest_id & 0xf;
return true;
default: