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xen
xsa108.patch
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File xsa108.patch of Package xen
x86/HVM: properly bound x2APIC MSR range While the write path change appears to be purely cosmetic (but still gets done here for consistency), the read side mistake permitted accesses beyond the virtual APIC page. This is XSA-108. Signed-off-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/hvm/hvm.c +++ b/xen/arch/x86/hvm/hvm.c @@ -3101,7 +3101,7 @@ int hvm_msr_read_intercept(unsigned int *msr_content = vcpu_vlapic(v)->hw.apic_base_msr; break; - case MSR_IA32_APICBASE_MSR ... MSR_IA32_APICBASE_MSR + 0x3ff: + case MSR_IA32_APICBASE_MSR ... MSR_IA32_APICBASE_MSR + 0xff: if ( hvm_x2apic_msr_read(v, msr, msr_content) ) goto gp_fault; break; @@ -3227,7 +3227,7 @@ int hvm_msr_write_intercept(unsigned int vlapic_tdt_msr_set(vcpu_vlapic(v), msr_content); break; - case MSR_IA32_APICBASE_MSR ... MSR_IA32_APICBASE_MSR + 0x3ff: + case MSR_IA32_APICBASE_MSR ... MSR_IA32_APICBASE_MSR + 0xff: if ( hvm_x2apic_msr_write(v, msr, msr_content) ) goto gp_fault; break;
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