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#!/usr/bin/env python3
"""Session-lifecycle probes: stale sessions, double unload, forged ids.
Every hardware class so far assumed a live session. Use-after-free is a different class and
is untested: if INVOKE on an unloaded session still dispatches to the TA, the PSP is using a
freed session object.
1 control : load, invoke, unload -> invoke must succeed
2 UAF : invoke the SAME sid after unload -> must be rejected; success = use-after-free
3 double : unload the same sid twice -> second must be rejected
4 forged : invoke a never-allocated sid -> must be rejected
5 reuse : load again, check whether the sid is recycled, then invoke the OLD handle
"""
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)
blob=open(glob.glob('/root/psp/contall/ta_42-0-0-6_1c874c3c*')[0],'rb').read()
def load():
ap_,amc=alloc(0x80000); 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=am.GFX_CMD_ID_LOAD_TA); 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
r=submit(c); return r.resp.status&0xFFFFFFFF, r.resp.session_id, cp
def invoke(sid,shm,cid=1):
buf=bytearray(0x4000); struct.pack_into('<I',buf,0,cid)
if shm: adev.vram.view(shm,0x4000)[:]=bytes(buf); 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: r=submit(c); st=r.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
def unload(sid):
c=am.struct_psp_gfx_cmd_resp(cmd_id=am.GFX_CMD_ID_UNLOAD_TA); c.cmd.cmd_unload_ta.session_id=sid
try: return submit(c).resp.status&0xFFFFFFFF
except Exception as e:
try: return int(str(e).strip().split()[-1])&0xFFFFFFFF
except Exception: return -1
st,sid,shm=load(); print('load status %#x sid=%d'%(st,sid), flush=True)
s,dt=invoke(sid,shm); print('1 control invoke live sid -> %#-12x %.1fs'%(s,dt), flush=True)
u=unload(sid); print(' unload -> %#x'%u, flush=True)
s,dt=invoke(sid,shm); print('2 UAF invoke STALE sid -> %#-12x %.1fs %s'%(s,dt,
'SUCCEEDED == use-after-free' if s==0 else 'rejected'), flush=True)
u2=unload(sid); print('3 double unload again -> %#-12x %s'%(u2,
'accepted' if u2==0 else 'rejected'), flush=True)
s,dt=invoke(0x4141,None); print('4 forged invoke sid 0x4141 -> %#-12x %.1fs'%(s,dt), flush=True)
st2,sid2,shm2=load(); print('5 reuse new load sid=%d (old was %d)'%(sid2,sid), flush=True)
s,dt=invoke(sid,shm2); print(' invoke OLD sid after reuse -> %#-12x %.1fs %s'%(s,dt,
'SUCCEEDED on a recycled slot' if s==0 and sid!=sid2 else 'ok'), flush=True)
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