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KVM: x86: fix missed SRCU usage in kvm_lapic_set_vapic_addr 

Reported by syzkaller:

    [ INFO: suspicious RCU usage. ]
    4.9.0-rc4+ #47 Not tainted
    -------------------------------
    ./include/linux/kvm_host.h:536 suspicious rcu_dereference_check() usage!

    stack backtrace:
    CPU: 1 PID: 6679 Comm: syz-executor Not tainted 4.9.0-rc4+ #47
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
     ffff880039e2f6d0 ffffffff81c2e46b ffff88003e3a5b40 0000000000000000
     0000000000000001 ffffffff83215600 ffff880039e2f700 ffffffff81334ea9
     ffffc9000730b000 0000000000000004 ffff88003c4f8420 ffff88003d3f8000
    Call Trace:
     [<     inline     >] __dump_stack lib/dump_stack.c:15
     [<ffffffff81c2e46b>] dump_stack+0xb3/0x118 lib/dump_stack.c:51
     [<ffffffff81334ea9>] lockdep_rcu_suspicious+0x139/0x180 kernel/locking/lockdep.c:4445
     [<     inline     >] __kvm_memslots include/linux/kvm_host.h:534
     [<     inline     >] kvm_memslots include/linux/kvm_host.h:541
     [<ffffffff8105d6ae>] kvm_gfn_to_hva_cache_init+0xa1e/0xce0 virt/kvm/kvm_main.c:1941
     [<ffffffff8112685d>] kvm_lapic_set_vapic_addr+0xed/0x140 arch/x86/kvm/lapic.c:2217

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: fda4e2e855
Cc: Andrew Honig <ahonig@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-11-17 15:55:46 +01:00 committed by Radim Krčmář
parent 22583f0d9c
commit 7301d6abae
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/x86.c
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@ -3431,6 +3431,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
}; };
case KVM_SET_VAPIC_ADDR: { case KVM_SET_VAPIC_ADDR: {
struct kvm_vapic_addr va; struct kvm_vapic_addr va;
int idx;
r = -EINVAL; r = -EINVAL;
if (!lapic_in_kernel(vcpu)) if (!lapic_in_kernel(vcpu))
@ -3438,7 +3439,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
r = -EFAULT; r = -EFAULT;
if (copy_from_user(&va, argp, sizeof va)) if (copy_from_user(&va, argp, sizeof va))
goto out; goto out;
idx = srcu_read_lock(&vcpu->kvm->srcu);
r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr); r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
break; break;
} }
case KVM_X86_SETUP_MCE: { case KVM_X86_SETUP_MCE: {