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Don't run libxdc

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This commit is contained in:
David Venhoff 2025-08-19 13:41:52 +02:00
parent ff1c897321
commit fd01132cad
4 changed files with 4 additions and 80 deletions
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1
nyx/hypercall/hypercall.c
View File

@ -119,7 +119,6 @@ bool handle_hypercall_kafl_next_payload(struct kvm_run *run,
pt_enable_ip_filtering(cpu, i, true, false);
}
}
pt_init_decoder(cpu);
}
request_fast_vm_reload(GET_GLOBAL_STATE()->reload_state,
REQUEST_LOAD_SNAPSHOT_ROOT);

1
nyx/nested_hypercalls.c
View File

@ -167,7 +167,6 @@ void handle_hypercall_kafl_nested_acquire(struct kvm_run *run,
pt_enable_ip_filtering(cpu, i, true, false);
}
}
pt_init_decoder(cpu);
qemu_mutex_lock_iothread();

80
nyx/pt.c
View File

@ -21,7 +21,6 @@ along with QEMU-PT. If not, see <http://www.gnu.org/licenses/>.
#include "qemu/osdep.h"
#include <libxdc.h>
#include <linux/kvm.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
@ -92,37 +91,11 @@ static inline int pt_ioctl(int fd, unsigned long request, unsigned long arg)
void pt_dump(CPUState *cpu, int bytes)
{
if (!(GET_GLOBAL_STATE()->redqueen_state &&
GET_GLOBAL_STATE()->redqueen_state->intercept_mode))
nyx_debug("Dumping file...");
if (GET_GLOBAL_STATE()->in_fuzzing_mode && !GET_GLOBAL_STATE()->dump_page)
{
if (GET_GLOBAL_STATE()->in_fuzzing_mode &&
GET_GLOBAL_STATE()->decoder_page_fault == false &&
GET_GLOBAL_STATE()->decoder && !GET_GLOBAL_STATE()->dump_page)
{
GET_GLOBAL_STATE()->pt_trace_size += bytes;
pt_write_pt_dump_file(cpu->pt_mmap, bytes);
decoder_result_t result =
libxdc_decode(GET_GLOBAL_STATE()->decoder, cpu->pt_mmap, bytes);
switch (result) {
case decoder_success:
break;
case decoder_success_pt_overflow:
cpu->intel_pt_run_trashed = true;
break;
case decoder_page_fault:
// nyx_warn("Page not found => 0x%lx\n", libxdc_get_page_fault_addr(GET_GLOBAL_STATE()->decoder));
GET_GLOBAL_STATE()->decoder_page_fault = true;
GET_GLOBAL_STATE()->decoder_page_fault_addr =
libxdc_get_page_fault_addr(GET_GLOBAL_STATE()->decoder);
break;
case decoder_unkown_packet:
nyx_warn("libxdc_decode returned unknown_packet\n");
break;
case decoder_error:
nyx_warn("libxdc_decode returned decoder_error\n");
break;
}
}
GET_GLOBAL_STATE()->pt_trace_size += bytes;
pt_write_pt_dump_file(cpu->pt_mmap, bytes);
}
}
@ -210,51 +183,6 @@ int pt_enable_ip_filtering(CPUState *cpu, uint8_t addrn, bool redqueen, bool hmp
return r;
}
void pt_init_decoder(CPUState *cpu)
{
uint64_t filters[4][2] = { 0 };
/* TODO time to clean up this code -.- */
filters[0][0] = GET_GLOBAL_STATE()->pt_ip_filter_a[0];
filters[0][1] = GET_GLOBAL_STATE()->pt_ip_filter_b[0];
filters[1][0] = GET_GLOBAL_STATE()->pt_ip_filter_a[1];
filters[1][1] = GET_GLOBAL_STATE()->pt_ip_filter_b[1];
filters[2][0] = GET_GLOBAL_STATE()->pt_ip_filter_a[2];
filters[2][1] = GET_GLOBAL_STATE()->pt_ip_filter_b[2];
filters[3][0] = GET_GLOBAL_STATE()->pt_ip_filter_a[3];
filters[3][1] = GET_GLOBAL_STATE()->pt_ip_filter_b[3];
assert(GET_GLOBAL_STATE()->decoder == NULL);
assert(GET_GLOBAL_STATE()->shared_bitmap_ptr != NULL);
assert(GET_GLOBAL_STATE()->shared_bitmap_size != 0);
if (GET_GLOBAL_STATE()->pt_ip_filter_configured[0] == false &&
GET_GLOBAL_STATE()->pt_ip_filter_configured[1] == false &&
GET_GLOBAL_STATE()->pt_ip_filter_configured[2] == false &&
GET_GLOBAL_STATE()->pt_ip_filter_configured[3] == false) {
nyx_abort("Intel PT mode cannot be enabled without any IP filters configured...\n");
}
GET_GLOBAL_STATE()->decoder =
libxdc_init(filters, (void *(*)(void *, uint64_t, bool *))page_cache_fetch2,
GET_GLOBAL_STATE()->page_cache,
GET_GLOBAL_STATE()->shared_bitmap_ptr,
GET_GLOBAL_STATE()->shared_bitmap_size);
if (GET_GLOBAL_STATE()->decoder == (void*)-1) {
nyx_abort("libxdc_init() has failed ...\n");
}
libxdc_register_bb_callback(GET_GLOBAL_STATE()->decoder,
(void (*)(void *, disassembler_mode_t, uint64_t,
uint64_t))redqueen_callback,
GET_GLOBAL_STATE()->redqueen_state);
alt_bitmap_init(GET_GLOBAL_STATE()->shared_bitmap_ptr,
GET_GLOBAL_STATE()->shared_bitmap_size);
}
int pt_disable_ip_filtering(CPUState *cpu, uint8_t addrn, bool hmp_mode)
{
int r = 0;

2
nyx/pt.h
View File

@ -22,8 +22,6 @@ along with QEMU-PT. If not, see <http://www.gnu.org/licenses/>.
#ifndef PT_H
#define PT_H
void pt_init_decoder(CPUState *cpu);
int pt_enable(CPUState *cpu, bool hmp_mode);
int pt_disable(CPUState *cpu, bool hmp_mode);
int pt_enable_ip_filtering(CPUState *cpu, uint8_t addrn, bool redqueen, bool hmp_mode);