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Patched cs_bypass #26

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Patched cs_bypass #26

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13 changes: 13 additions & 0 deletions hw/arm/n66_iphone6splus.c
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,8 @@
#define CMP_X9_x9_INST (0xeb09013f)
//compiled instruction: mov w7, #0
#define W7_ZERO_INST (0x52800007)
//compiled instruction mov w15, #8
#define MOV_W15_8_INST (0x5280010F)

#define INITIAL_BRANCH_VADDR_16B92 (0xfffffff0070a5098)
#define BZERO_COND_BRANCH_VADDR_16B92 (0xfffffff0070996d8)
Expand All @@ -60,6 +62,8 @@
#define TFP0_KERNEL_TASK_CMP_1_16B92 (0xfffffff0070d7b04)
#define TFP0_KERNEL_TASK_CMP_2_16B92 (0xfffffff0070d810c)

#define VM_FAULT_CS_BYPASS_TBZ_16B92 (0xFFFFFFF0071497B8)

//hook the kernel to execute our "driver" code in this function
//after things are already running in the kernel but the root mount is not
//yet mounted.
Expand Down Expand Up @@ -186,6 +190,8 @@ static uint32_t g_set_cpacr_and_branch_inst[] = {
static uint32_t g_bzero_branch_unconditionally_inst = 0x14000039;
static uint32_t g_qemu_call = 0xd51bff1f;

static uint32_t g_mov_w15_08_inst = MOV_W15_8_INST;

static void n66_add_cpregs(N66MachineState *nms)
{
ARMCPU *cpu = nms->cpu;
Expand Down Expand Up @@ -276,6 +282,13 @@ static void n66_patch_kernel(AddressSpace *nsas)
address_space_rw(nsas, vtop_static(CORE_TRUST_CHECK_16B92),
MEMTXATTRS_UNSPECIFIED, (uint8_t *)&g_mov_w0_01_inst,
sizeof(g_mov_w0_01_inst), 1);

//patch the instruction that check cs_bypass to bypass the code-signing
// checking - otherwise application like frida will get panic (CS_KILLED)
address_space_rw(nsas, vtop_static(VM_FAULT_CS_BYPASS_TBZ_16B92),
MEMTXATTRS_UNSPECIFIED, (uint8_t *)&g_mov_w15_08_inst,
sizeof(g_mov_w15_08_inst), 1);

}

static void n66_ns_memory_setup(MachineState *machine, MemoryRegion *sysmem,
Expand Down