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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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81cdb259fb
KVM was using arrays of size KVM_MAX_VCPUS with vcpu_id, but ID can be
bigger that the maximal number of VCPUs, resulting in out-of-bounds
access.
Found by syzkaller:
BUG: KASAN: slab-out-of-bounds in __apic_accept_irq+0xb33/0xb50 at addr [...]
Write of size 1 by task a.out/27101
CPU: 1 PID: 27101 Comm: a.out Not tainted 4.9.0-rc5+ #49
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[...]
Call Trace:
[...] __apic_accept_irq+0xb33/0xb50 arch/x86/kvm/lapic.c:905
[...] kvm_apic_set_irq+0x10e/0x180 arch/x86/kvm/lapic.c:495
[...] kvm_irq_delivery_to_apic+0x732/0xc10 arch/x86/kvm/irq_comm.c:86
[...] ioapic_service+0x41d/0x760 arch/x86/kvm/ioapic.c:360
[...] ioapic_set_irq+0x275/0x6c0 arch/x86/kvm/ioapic.c:222
[...] kvm_ioapic_inject_all arch/x86/kvm/ioapic.c:235
[...] kvm_set_ioapic+0x223/0x310 arch/x86/kvm/ioapic.c:670
[...] kvm_vm_ioctl_set_irqchip arch/x86/kvm/x86.c:3668
[...] kvm_arch_vm_ioctl+0x1a08/0x23c0 arch/x86/kvm/x86.c:3999
[...] kvm_vm_ioctl+0x1fa/0x1a70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3099
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: stable@vger.kernel.org
Fixes: af1bae5497 ("KVM: x86: bump KVM_MAX_VCPU_ID to 1023")
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
#ifndef __KVM_IO_APIC_H
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#define __KVM_IO_APIC_H
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#include <linux/kvm_host.h>
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#include <kvm/iodev.h>
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struct kvm;
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struct kvm_vcpu;
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#define IOAPIC_NUM_PINS KVM_IOAPIC_NUM_PINS
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#define MAX_NR_RESERVED_IOAPIC_PINS KVM_MAX_IRQ_ROUTES
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#define IOAPIC_VERSION_ID 0x11 /* IOAPIC version */
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#define IOAPIC_EDGE_TRIG 0
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#define IOAPIC_LEVEL_TRIG 1
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#define IOAPIC_DEFAULT_BASE_ADDRESS 0xfec00000
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#define IOAPIC_MEM_LENGTH 0x100
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/* Direct registers. */
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#define IOAPIC_REG_SELECT 0x00
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#define IOAPIC_REG_WINDOW 0x10
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/* Indirect registers. */
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#define IOAPIC_REG_APIC_ID 0x00 /* x86 IOAPIC only */
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#define IOAPIC_REG_VERSION 0x01
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#define IOAPIC_REG_ARB_ID 0x02 /* x86 IOAPIC only */
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/*ioapic delivery mode*/
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#define IOAPIC_FIXED 0x0
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#define IOAPIC_LOWEST_PRIORITY 0x1
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#define IOAPIC_PMI 0x2
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#define IOAPIC_NMI 0x4
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#define IOAPIC_INIT 0x5
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#define IOAPIC_EXTINT 0x7
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#ifdef CONFIG_X86
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#define RTC_GSI 8
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#else
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#define RTC_GSI -1U
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#endif
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struct dest_map {
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/* vcpu bitmap where IRQ has been sent */
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DECLARE_BITMAP(map, KVM_MAX_VCPU_ID);
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/*
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* Vector sent to a given vcpu, only valid when
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* the vcpu's bit in map is set
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*/
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u8 vectors[KVM_MAX_VCPU_ID];
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};
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struct rtc_status {
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int pending_eoi;
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struct dest_map dest_map;
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};
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union kvm_ioapic_redirect_entry {
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u64 bits;
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struct {
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u8 vector;
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u8 delivery_mode:3;
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u8 dest_mode:1;
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u8 delivery_status:1;
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u8 polarity:1;
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u8 remote_irr:1;
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u8 trig_mode:1;
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u8 mask:1;
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u8 reserve:7;
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u8 reserved[4];
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u8 dest_id;
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} fields;
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};
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struct kvm_ioapic {
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u64 base_address;
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u32 ioregsel;
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u32 id;
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u32 irr;
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u32 pad;
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union kvm_ioapic_redirect_entry redirtbl[IOAPIC_NUM_PINS];
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unsigned long irq_states[IOAPIC_NUM_PINS];
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struct kvm_io_device dev;
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struct kvm *kvm;
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void (*ack_notifier)(void *opaque, int irq);
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spinlock_t lock;
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struct rtc_status rtc_status;
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struct delayed_work eoi_inject;
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u32 irq_eoi[IOAPIC_NUM_PINS];
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u32 irr_delivered;
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};
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#ifdef DEBUG
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#define ASSERT(x) \
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do { \
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if (!(x)) { \
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printk(KERN_EMERG "assertion failed %s: %d: %s\n", \
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__FILE__, __LINE__, #x); \
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BUG(); \
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} \
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} while (0)
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#else
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#define ASSERT(x) do { } while (0)
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#endif
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static inline struct kvm_ioapic *ioapic_irqchip(struct kvm *kvm)
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{
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return kvm->arch.vioapic;
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}
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static inline int ioapic_in_kernel(struct kvm *kvm)
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{
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int ret;
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ret = (ioapic_irqchip(kvm) != NULL);
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return ret;
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}
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void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu);
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bool kvm_apic_match_dest(struct kvm_vcpu *vcpu, struct kvm_lapic *source,
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int short_hand, unsigned int dest, int dest_mode);
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int kvm_apic_compare_prio(struct kvm_vcpu *vcpu1, struct kvm_vcpu *vcpu2);
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void kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu, int vector,
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int trigger_mode);
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int kvm_ioapic_init(struct kvm *kvm);
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void kvm_ioapic_destroy(struct kvm *kvm);
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int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int irq_source_id,
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int level, bool line_status);
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void kvm_ioapic_clear_all(struct kvm_ioapic *ioapic, int irq_source_id);
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int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
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struct kvm_lapic_irq *irq,
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struct dest_map *dest_map);
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int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
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int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
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void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu,
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ulong *ioapic_handled_vectors);
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void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
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ulong *ioapic_handled_vectors);
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#endif
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