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#!/usr/bin/env python3
"""Loader type confusion: ASD blob via LOAD_TA, TA blob via LOAD_ASD.
TAs are class TA (invokable); ASD is class DR (driver, refuses INVOKE). If the loader trusts
the GFX command rather than the image's own class field, a blob parsed as the wrong class
could take a mismatched path -- the classic type-confusion shape, and never tested here.
Cases, each with a PSP-health control afterwards:
A TA blob via LOAD_TA (control, expect 0x0)
B ASD blob via LOAD_ASD (control, expect 0x0)
C ASD blob via LOAD_TA <- confusion
D TA blob via LOAD_ASD <- confusion
E if C or D loads, try to INVOKE it (a DR-class blob invoked as a TA)
"""
import glob, struct, sys, time
sys.path.insert(0,'/root/psp/hw')
from tinygrad import Device
import tinygrad.runtime.autogen.am.am as am
from ring_wrap import install
adev=Device["AMD"].iface.dev_impl; psp=adev.psp
submit=install(psp,adev)
def alloc(n):
pa=adev.mm.palloc(n,align=0x1000,zero=True,boot=False); return pa,adev.paddr2mc(pa)
ta=open(glob.glob('/root/psp/contall/ta_42-0-0-6_1c874c3c*')[0],'rb').read()
asd=open(glob.glob('/root/psp/contall/asd_33-0-16-144_aaa06ff8*')[0],'rb').read()
def load(blob, cmd_id, tag):
ap_,amc=alloc(0x100000); cp,cmc=alloc(0x8000)
n=(len(blob)+3)&~3
adev.vram.view(ap_,n)[:]=blob+b'\x00'*(n-len(blob)); adev.gmc.flush_hdp()
c=am.struct_psp_gfx_cmd_resp(cmd_id=cmd_id); t=c.cmd.cmd_load_ta
t.app_phy_addr_lo,t.app_phy_addr_hi=amc&0xFFFFFFFF,amc>>32; t.app_len=len(blob)
t.cmd_buf_phy_addr_lo,t.cmd_buf_phy_addr_hi=cmc&0xFFFFFFFF,cmc>>32; t.cmd_buf_len=0x4000
t0=time.time(); sid=None
try:
r=submit(c); st=r.resp.status&0xFFFFFFFF; sid=r.resp.session_id
except Exception as e:
try: st=int(str(e).strip().split()[-1])&0xFFFFFFFF
except Exception: st=-1
dt=time.time()-t0
print(' %-34s -> %#-11x %.1fs sid=%s%s'%(tag,st,dt,sid,' <<< STALL' if dt>5 else ''), flush=True)
return st, sid, cp, dt
def invoke(sid,cp,cid=1):
b=bytearray(0x4000); struct.pack_into('<I',b,0,cid)
adev.vram.view(cp,0x4000)[:]=bytes(b); adev.gmc.flush_hdp()
c=am.struct_psp_gfx_cmd_resp(cmd_id=am.GFX_CMD_ID_INVOKE_CMD)
iv=c.cmd.cmd_invoke_cmd; iv.session_id,iv.ta_cmd_id=sid,cid
t0=time.time()
try: st=submit(c).resp.status&0xFFFFFFFF
except Exception as e:
try: st=int(str(e).strip().split()[-1])&0xFFFFFFFF
except Exception: st=-1
return st, time.time()-t0
load(ta, am.GFX_CMD_ID_LOAD_TA, 'A control: TA via LOAD_TA')
load(asd, am.GFX_CMD_ID_LOAD_ASD, 'B control: ASD via LOAD_ASD')
stc,sidc,cpc,dtc = load(asd, am.GFX_CMD_ID_LOAD_TA, 'C ASD blob via LOAD_TA')
if stc==0 and sidc is not None and dtc<5:
s,dt=invoke(sidc,cpc); print(' -> INVOKE of a DR blob as TA: %#x %.1fs%s'%(s,dt,' <<< STALL' if dt>5 else ''), flush=True)
std,sidd,cpd,dtd = load(ta, am.GFX_CMD_ID_LOAD_ASD, 'D TA blob via LOAD_ASD')
if std==0 and sidd is not None and dtd<5:
s,dt=invoke(sidd,cpd); print(' -> INVOKE of a TA loaded as ASD: %#x %.1fs%s'%(s,dt,' <<< STALL' if dt>5 else ''), flush=True)
st,_,_,_ = load(ta, am.GFX_CMD_ID_LOAD_TA, 'HEALTH control: TA via LOAD_TA')
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