diff options
| -rw-r--r-- | target-i386/kvm.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/target-i386/kvm.c b/target-i386/kvm.c index 4a3f598e4f..cab9fccaec 100644 --- a/target-i386/kvm.c +++ b/target-i386/kvm.c @@ -239,8 +239,11 @@ static int kvm_has_msr_star(CPUState *env) if (ret < 0) return 0; - kvm_msr_list = qemu_mallocz(sizeof(msr_list) + - msr_list.nmsrs * sizeof(msr_list.indices[0])); + /* Old kernel modules had a bug and could write beyond the provided + memory. Allocate at least a safe amount of 1K. */ + kvm_msr_list = qemu_mallocz(MAX(1024, sizeof(msr_list) + + msr_list.nmsrs * + sizeof(msr_list.indices[0]))); kvm_msr_list->nmsrs = msr_list.nmsrs; ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, kvm_msr_list); |