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kernel_memory.c
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kernel_memory.c
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#include <stdio.h>
#include <stdlib.h>
#include "kernel_memory.h"
#include "slide.h"
#include "mach_vm.h"
#include <assert.h>
uint64_t
kernel_vm_allocate(size_t size)
{
mach_vm_address_t address = 0;
kern_return_t kr = mach_vm_allocate(kernel_task_port, &address, size, VM_FLAGS_ANYWHERE);
if(kr != KERN_SUCCESS)
{
fprintf(stderr, "%s returned %d: %s", "mach_vm_allocate", kr, mach_error_string(kr));
address = - 1;
} else
{
for(size_t offset = 0; offset < size; offset += PAGE_SIZE)
kernel_read64(address + offset);
}
return address;
}
void
kernel_vm_deallocate(uint64_t address, size_t size)
{
kern_return_t kr = mach_vm_deallocate(kernel_task_port, address, size);
if(kr != KERN_SUCCESS)
{
fprintf(stderr, "%s returned %d: %s", "mach_vm_deallocate", kr, mach_error_string(kr));
}
}
bool
kernel_vm_protect(uint64_t address, size_t size, vm_prot_t prot)
{
kern_return_t kr = mach_vm_protect(kernel_task_port, address, size, FALSE, prot);
if(kr != KERN_SUCCESS)
{
fprintf(stderr, "%s returned %d: %s", "mach_vm_protect", kr, mach_error_string(kr));
return false;
}
return true;
}
void*
kernel_vm_remap(uint64_t address, size_t size)
{
mach_vm_address_t target_address = 0;
vm_prot_t cur_prot, max_prot;
kern_return_t kr = mach_vm_remap(mach_task_self(),
&target_address,
size,
0,
VM_FLAGS_ANYWHERE,
kernel_task_port,
address,
FALSE,
&cur_prot,
&max_prot,
VM_INHERIT_NONE);
if(kr != KERN_SUCCESS)
{
fprintf(stderr, "%s returned %d: %s", "mach_vm_remap", kr, mach_error_string(kr));
return NULL;
}
return (void*) target_address;
}
bool
kernel_read(uint64_t address, void *data, size_t size)
{
mach_vm_size_t size_out;
kern_return_t kr = mach_vm_read_overwrite(kernel_task_port,
address,
size,
(mach_vm_address_t)data,
&size_out);
if(kr != KERN_SUCCESS)
{
fprintf(stderr, "%s returned %d: %s", "mach_vm_read_overwrite", kr, mach_error_string(kr));
fprintf(stderr, "could not %s address 0x%016llx", "read", address);
return false;
}
if(size != size_out)
{
fprintf(stderr, "partial read of address 0x%016llx: %llu of %zu bytes",
address, size_out, size);
return false;
}
return true;
}
bool kernel_write(uint64_t address, const void *data, size_t size)
{
const uint8_t *write_data = data;
while(size > 0)
{
size_t write_size = size;
if(write_size > PAGE_SIZE)
write_size = PAGE_SIZE;
kern_return_t kr = mach_vm_write(kernel_task_port,
address,
(mach_vm_address_t)write_data,
(mach_msg_size_t)write_size);
if(kr != KERN_SUCCESS)
{
fprintf(stderr, "%s returned %d: %s", "mach_vm_read_write", kr, mach_error_string(kr));
fprintf(stderr, "could not %s address 0x%016llx", "read", address);
return false;
}
address += write_size;
write_data += write_size;
size -= write_size;
}
return true;
}
uint8_t
kernel_read8(uint64_t address) {
uint8_t value;
bool ok = kernel_read(address, &value, sizeof(value));
if (!ok) {
return -1;
}
return value;
}
uint16_t
kernel_read16(uint64_t address) {
uint16_t value;
bool ok = kernel_read(address, &value, sizeof(value));
if (!ok) {
return -1;
}
return value;
}
uint32_t
kernel_read32(uint64_t address) {
uint32_t value;
bool ok = kernel_read(address, &value, sizeof(value));
if (!ok) {
return -1;
}
return value;
}
uint64_t
kernel_read64(uint64_t address) {
uint64_t value;
bool ok = kernel_read(address, &value, sizeof(value));
if (!ok) {
return -1;
}
return value;
}
bool
kernel_write8(uint64_t address, uint8_t value) {
return kernel_write(address, &value, sizeof(value));
}
bool
kernel_write16(uint64_t address, uint16_t value) {
return kernel_write(address, &value, sizeof(value));
}
bool
kernel_write32(uint64_t address, uint32_t value) {
return kernel_write(address, &value, sizeof(value));
}
bool
kernel_write64(uint64_t address, uint64_t value) {
return kernel_write(address, &value, sizeof(value));
}