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"""Crash-oracle-driven fuzzer over the host-reachable HDCP command/subcommand space.
Detector: PSP fault dump in C2PMSG 82..88 (nonzero => a fault fired) + is_sos_alive
+ timing. Avoids the known subcmd12 MAC hang (caps subcmd12 N < 50) so it runs
many cases per boot. Any crash-oracle hit at a PC other than the known MAC-hang
(0x40433c / fault_lr 0x40173e) is a NEW fault worth chasing.
"""
import ctypes, struct, time, random
from tinygrad import Device
from tinygrad.runtime.autogen.am import am
from tinygrad.helpers import lo32, hi32
d=Device["AMD"]; adev=d.iface.dev_impl; psp=adev.psp
SZ=ctypes.sizeof(am.struct_psp_gfx_cmd_resp); C2P=90112+64
def crash(): return tuple(adev.rreg(C2P+n) for n in (82,83,84,85,86,88))
def stat(): return int.from_bytes(bytes(adev.vram.view(psp.cmd_paddr,SZ)[:])[864:868],"little")
def alloc(n):
pa=adev.mm.palloc(n,align=0x1000,zero=True); return pa,adev.paddr2mc(pa)
P='/Users/user/dev/amd-psp-re/psp_out/'
def load(cmd,blob):
ap,amc=alloc(0x40000); cp,cmc=alloc(0x8000)
adev.vram.view(ap,len(blob))[:]=blob; adev.gmc.flush_hdp()
adev.vram.view(psp.cmd_paddr,SZ)[:]=b"\x00"*SZ
c=am.struct_psp_gfx_cmd_resp(cmd_id=cmd); t=c.cmd.cmd_load_ta
t.app_phy_addr_hi,t.app_phy_addr_lo=hi32(amc),lo32(amc); t.app_len=len(blob)
t.cmd_buf_phy_addr_hi,t.cmd_buf_phy_addr_lo=hi32(cmc),lo32(cmc); t.cmd_buf_len=0x8000
r=psp._ring_submit(c); return r.resp.session_id,cp
load(am.GFX_CMD_ID_LOAD_ASD, open(P+'asd_full.bin','rb').read())
dtm_sid,dtm_shm=load(am.GFX_CMD_ID_LOAD_TA, open(P+'dtm_full.bin','rb').read())
sid,shm=load(am.GFX_CMD_ID_LOAD_TA, open(P+'hdcp_full.bin','rb').read())
def inv(s,sh,buf,tc):
adev.vram.view(sh,0x8000)[:]=bytes(buf); adev.gmc.flush_hdp()
adev.vram.view(psp.cmd_paddr,SZ)[:]=b"\x00"*SZ
ic=am.struct_psp_gfx_cmd_resp(cmd_id=am.GFX_CMD_ID_INVOKE_CMD); iv=ic.cmd.cmd_invoke_cmd
iv.session_id,iv.ta_cmd_id=s,tc; t0=time.time()
try: psp._ring_submit(ic); return 0, time.time()-t0
except RuntimeError: return stat(), time.time()-t0
except TimeoutError: return "TO", time.time()-t0
def topo(h):
b=bytearray(0x8000); struct.pack_into('<I',b,0,2)
struct.pack_into('<10I',b,0x10,h,1,1,0,0,0,0,0,0,0); inv(dtm_sid,dtm_shm,b,2)
for h in range(8): topo(h)
# open a couple slots so subcommands are reachable
for dv in (0x11,0x22):
b=bytearray(0x8000); struct.pack_into('<I',b,0,0x0E); struct.pack_into('<I',b,0xC,dv); inv(sid,shm,b,0x0E)
rng=random.Random(0xC0FFEE)
base=crash()
print("baseline crash oracle:", [hex(x) for x in base])
KNOWN={0x40433c,0x40173e,0x0}
hits=[]; n=0; t0=time.time()
CMDS=[1,2,3,4,5,6,7,9,0xB,0xC,0xE,0xF,0x10,0x11,0x12,0x13]
try:
for it in range(1200):
cmd=rng.choice(CMDS)
b=bytearray(0x8000); struct.pack_into('<I',b,0,cmd)
# slot index: mostly valid 0-7, sometimes OOB
struct.pack_into('<I',b,0xC, rng.choice([0,1,2,3,7,rng.randint(0,0x40)]))
if cmd==0x0F:
# multi-subcommand framing fuzz (small lengths to avoid MAC hang)
struct.pack_into('<I',b,0x10, rng.choice([3,6,7,8,10,12,17,18,20,rng.randint(0,40)]))
struct.pack_into('<I',b,0x14, rng.choice([6,0,rng.randint(0,600)])) # desc1.len
struct.pack_into('<I',b,0x18, rng.choice([12,20,rng.randint(0,40)]))
struct.pack_into('<I',b,0x1C, rng.choice([31,0,rng.randint(0,600)])) # desc2.len
struct.pack_into('<I',b,0x20, rng.randint(0,40))
# data area: id byte + small random payload; subcmd12 N kept < 50
for k in range(0x28,0x28+0x200): b[k]=rng.randint(0,255)
b[0x28]=b[0x10]&0xFF
# if subcmd12 anywhere, keep its count byte small
b[0x2B]=rng.randint(0,49)
else:
for k in range(0xC,0xC+0x80): b[k]=rng.randint(0,255)
struct.pack_into('<I',b,0xC, rng.choice([0,1,2,3,7,rng.randint(0,0x40)]))
r,dt=inv(sid,shm,b,cmd)
n+=1
if r=="TO" or dt>2.0 or not psp.is_sos_alive():
c=crash()
print("!! ANOMALY it=%d cmd=%#x r=%s dt=%.2f alive=%s crash=%s"%(it,cmd,r,dt,psp.is_sos_alive(),[hex(x) for x in c]))
hits.append((it,cmd,r,c)); break
c=crash()
if c!=base and (c[2]&0xffffff)!=0 and c[2] not in KNOWN:
pcv=c[2]
if pcv not in KNOWN:
print("!! CRASH it=%d cmd=%#x faultPC=%#x crash=%s"%(it,cmd,pcv,[hex(x) for x in c]))
hits.append((it,cmd,r,c))
base=c # avoid re-report
except Exception as e:
print("exception:",repr(e))
print("\nran %d cases in %.1fs; hits=%d; sOS alive=%s"%(n,time.time()-t0,len(hits),psp.is_sos_alive()))
print("final crash oracle:", [hex(x) for x in crash()])
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