7af65d1fdc
- root snapshot serialization / deserialization - abort if specific hypercalls are called during fuzzing - ignore requests to disable write protection
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
#include "qemu/osdep.h"
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#include "nyx/state/state.h"
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#include "nyx/hypercall/configuration.h"
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#include "nyx/memory_access.h"
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#include "nyx/helpers.h"
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void handle_hypercall_kafl_get_host_config(struct kvm_run *run, CPUState *cpu, uint64_t hypercall_arg){
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uint64_t vaddr = hypercall_arg;
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host_config_t config;
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if(is_called_in_fuzzing_mode("KVM_EXIT_KAFL_GET_HOST_CONFIG")){
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return;
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}
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memset((void*)&config, 0, sizeof(host_config_t));
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config.host_magic = NYX_HOST_MAGIC;
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config.host_version = NYX_HOST_VERSION;
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config.bitmap_size = GET_GLOBAL_STATE()->shared_bitmap_size;
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config.ijon_bitmap_size = GET_GLOBAL_STATE()->shared_ijon_bitmap_size;
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config.payload_buffer_size = GET_GLOBAL_STATE()->shared_payload_buffer_size;
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write_virtual_memory(vaddr, (uint8_t*)&config, sizeof(host_config_t), cpu);
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}
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void handle_hypercall_kafl_set_agent_config(struct kvm_run *run, CPUState *cpu, uint64_t hypercall_arg){
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uint64_t vaddr = hypercall_arg;
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agent_config_t config;
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if(is_called_in_fuzzing_mode("KVM_EXIT_KAFL_SET_AGENT_CONFIG")){
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return;
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}
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X86CPU *cpux86 = X86_CPU(cpu);
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CPUX86State *env = &cpux86->env;
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if(read_virtual_memory(vaddr, (uint8_t*)&config, sizeof(agent_config_t), cpu)){
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if (config.agent_magic != NYX_AGENT_MAGIC){
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fprintf(stderr, "[QEMU-Nyx] Error: NYX_AGENT_MAGIC not found in agent configuration - You are probably using an outdated agent...\n");
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exit(1);
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}
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if (config.agent_version != NYX_AGENT_VERSION){
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fprintf(stderr, "[QEMU-Nyx] Error: NYX_AGENT_VERSION does not match in agent configuration (%d != %d) - You are probably using an outdated agent...\n", config.agent_version, NYX_AGENT_VERSION);
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exit(1);
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}
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GET_GLOBAL_STATE()->cap_timeout_detection = config.agent_timeout_detection;
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GET_GLOBAL_STATE()->cap_only_reload_mode = !!!config.agent_non_reload_mode; /* fix this */
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GET_GLOBAL_STATE()->cap_compile_time_tracing = config.agent_tracing;
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if(!GET_GLOBAL_STATE()->cap_compile_time_tracing && !GET_GLOBAL_STATE()->nyx_fdl){
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fprintf(stderr, "[QEMU-Nyx] Error: Attempt to fuzz target without compile-time instrumentation - Intel PT is not supported on this KVM build!\n");
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exit(1);
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}
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GET_GLOBAL_STATE()->cap_ijon_tracing = config.agent_ijon_tracing;
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if(config.agent_tracing){
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GET_GLOBAL_STATE()->cap_compile_time_tracing_buffer_vaddr = config.trace_buffer_vaddr;
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GET_GLOBAL_STATE()->pt_trace_mode = false;
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}
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if(config.agent_ijon_tracing){
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GET_GLOBAL_STATE()->cap_ijon_tracing_buffer_vaddr = config.ijon_trace_buffer_vaddr;
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}
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GET_GLOBAL_STATE()->cap_cr3 = env->cr[3];
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GET_GLOBAL_STATE()->cap_coverage_bitmap_size = config.coverage_bitmap_size;
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GET_GLOBAL_STATE()->input_buffer_size = GET_GLOBAL_STATE()->shared_payload_buffer_size;
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if (config.input_buffer_size){
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abort();
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}
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if(apply_capabilities(cpu) == false){
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nyx_abort((char*)"applying agent configuration failed...");
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}
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if(getenv("DUMP_PAYLOAD_MODE")){
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config.dump_payloads = 1;
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write_virtual_memory(vaddr, (uint8_t*)&config, sizeof(agent_config_t), cpu);
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}
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}
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else{
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fprintf(stderr, "[QEMU-Nyx] Error: %s - failed (vaddr: 0x%lx)!\n", __func__, vaddr);
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exit(1);
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}
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} |