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xen
xsa106.patch
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File xsa106.patch of Package xen
x86emul: only emulate software interrupt injection for real mode Protected mode emulation currently lacks proper privilege checking of the referenced IDT entry, and there's currently no legitimate way for any of the respective instructions to reach the emulator when the guest is in protected mode. This is XSA-106. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Keir Fraser <keir@xen.org> --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -2634,6 +2634,7 @@ x86_emulate( case 0xcd: /* int imm8 */ src.val = insn_fetch_type(uint8_t); swint: + fail_if(!in_realmode(ctxt, ops)); /* XSA-106 */ fail_if(ops->inject_sw_interrupt == NULL); rc = ops->inject_sw_interrupt(src.val, _regs.eip - ctxt->regs->eip, ctxt) ? : X86EMUL_EXCEPTION;
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