_priv_gate.nx source

1// _priv_gate.nx -- gate for M/S/U PRIVILEGE + privilege-gated paging (privilege-levels capability). NO mocks. 2// 3// (1) PRIVILEGE-GATED -- emits + runs nx_priv_emit: the SAME VA 0xC0009000 reads as identity in 4// M-mode ("MID") and translates to the sentinel in S-mode after mret ("SOK") -> serial 5// "MIDSOK" + clean halt. Proves translation applies only in S/U and that mret M->S works. 6// (2) CONTROL -- re-emit with MPP=M (0x1800) so mret stays in M-mode: the second VA load is then 7// ALSO Bare (identity) -> "SX" instead of "SOK". Proves "SOK" REQUIRES S-mode (the gating is 8// real -- M-mode never translates). 9// 10// Evidence -> knowledge/status/priv.log (PRIVGATE row). Sovereign. license_tier: ORIGINAL 11import "nx_syscalls.nx" 12 13const V_EMIT: *u8 = "_offc/nx_priv_emit.elf" 14const V_SOV: *u8 = "_offc/nx_boot_run_sov.elf" 15const V_BIN: *u8 = "runtime/_hdl_build/_priv_virt.bin" 16 17func g_p(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 } 18func g_fp(fd: i64, s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(fd,s,n); return 0 } 19func g_fn(fd: i64, v: i64) -> i64 { let bb: *u8=sys_mmap(28); var m: i64=v; if m<0{m=0-m}; let t: *u8=sys_mmap(28); var k: i64=0; if m==0{t[0]=48;k=1}; while m>0{t[k]=(48+(m%10)) as u8;m=m/10;k=k+1}; var i: i64=0; while i<k{bb[i]=t[k-1-i];i=i+1}; sys_write(fd,bb,k); return 0 } 20 21func g_run(prog: *u8, a1: *u8, a2: *u8, outpath: *u8) -> i64 { 22 let pid: i64 = sys_fork() 23 if pid == 0 { 24 if outpath != (0 as *u8) { let ofd: i64 = sys_openat_wr(outpath, 0x1a4); if ofd >= 0 { sys_dup3(ofd, 1, 0); sys_dup3(ofd, 2, 0) } } 25 let argv: *i64 = sys_mmap(32) as *i64 26 argv[0] = prog as i64 27 var k: i64 = 1 28 if a1 != (0 as *u8) { argv[k] = a1 as i64; k = k + 1 } 29 if a2 != (0 as *u8) { argv[k] = a2 as i64; k = k + 1 } 30 argv[k] = 0 31 let envp: *i64 = sys_mmap(16) as *i64 32 envp[0] = "PATH=/usr/bin:/bin" as *u8 as i64; envp[1] = 0 33 sys_execve(prog, argv, envp) 34 sys_exit(127) 35 } 36 let st: *i64 = sys_mmap(16) as *i64 37 sys_wait4(pid, st, 0) 38 let sg: i64 = st[0] & 0x7f 39 if sg != 0 { return 128 + sg } 40 return (st[0] >> 8) & 0xff 41} 42func g_read(path: *u8, buf: *u8, cap: i64) -> i64 { 43 let fd: i64 = sys_openat_rd(path) 44 if fd < 0 { return 0 } 45 var n: i64 = 0 46 var go: i64 = 1 47 while go == 1 { let r: i64 = sys_read(fd, (buf as i64 + n) as *u8, cap - 1 - n); if r <= 0 { go = 0 } else { n = n + r } if n >= cap - 1 { go = 0 } } 48 sys_close(fd) 49 return n 50} 51func g_has(buf: *u8, n: i64, pat: *u8, pl: i64) -> i64 { 52 if pl <= 0 { return 0 } 53 var i: i64 = 0 54 while i + pl <= n { var k: i64=0; var hit: i64=1; while k<pl { if buf[i+k]!=pat[k]{hit=0;k=pl}else{k=k+1} } if hit==1 { return 1 } i=i+1 } 55 return 0 56} 57 58func main() -> i64 { 59 g_p("=== M/S/U privilege gate (Sv39 translation only in S/U; mret M->S) ===\n" as *u8) 60 let lfd: i64 = sys_openat_append("knowledge/status/priv.log" as *u8, 0x1a4) 61 62 // (1) privilege-gated: MIDSOK 63 g_run(V_EMIT, 0 as *u8, 0 as *u8, "/tmp/_pv_emit.out" as *u8) 64 g_run(V_SOV, V_BIN, 0 as *u8, "/tmp/_pv_main.txt" as *u8) 65 let mb: *u8 = sys_mmap(65536); let mn: i64 = g_read("/tmp/_pv_main.txt" as *u8, mb, 65536) 66 var gated_ok: i64 = 0 67 if g_has(mb, mn, "MIDSOK" as *u8, 6) == 1 { if g_has(mb, mn, "BOOTSOV verdict=GREEN" as *u8, 21) == 1 { gated_ok = 1 } } 68 69 // (2) control: MPP=M (stay M) -> no S-mode -> 2nd load Bare -> "SX" not "SOK" 70 g_run(V_EMIT, "0x1800" as *u8, "/tmp/_pv_ctrl.bin" as *u8, "/tmp/_pv_ctrl_emit.out" as *u8) 71 g_run(V_SOV, "/tmp/_pv_ctrl.bin" as *u8, 0 as *u8, "/tmp/_pv_ctrl.txt" as *u8) 72 let cb: *u8 = sys_mmap(65536); let cn: i64 = g_read("/tmp/_pv_ctrl.txt" as *u8, cb, 65536) 73 var control_ok: i64 = 0 74 if g_has(cb, cn, "MID" as *u8, 3) == 1 { if g_has(cb, cn, "SOK" as *u8, 3) == 0 { control_ok = 1 } } 75 76 g_p(" privilege_gated=" as *u8); if gated_ok==1 { g_p("GREEN(MIDSOK: same VA identity in M, translated in S)" as *u8) } else { g_p("RED" as *u8) } 77 g_p(" control_stayM_no_SOK=" as *u8); g_fn(1, control_ok); g_p("\n" as *u8) 78 79 var pass: i64 = 0 80 if gated_ok == 1 { if control_ok == 1 { pass = 1 } } 81 if pass == 1 { 82 g_p("PRIVGATE verdict=GREEN (M/S/U privilege: Sv39 translation applies ONLY in S/U -- the SAME VA is identity in M-mode [MID] and translates in S-mode after mret [SOK]; the MPP=M control stays in M -> no translation -> no SOK. probe=privilege-levels)\n" as *u8) 83 if lfd >= 0 { g_fp(lfd, "PRIVGATE verdict=GREEN keystone=privilege-levels-msu probe=privilege-levels mret-M-to-S=yes M-mode-bare=yes S-mode-translate=yes control=stayM-no-SOK epoch=" as *u8); g_fn(lfd, sys_now_realtime_sec()); g_fp(lfd, "\n" as *u8); sys_close(lfd) } 84 sys_exit(0); return 0 85 } 86 g_p("PRIVGATE verdict=RED (gated/control not all green)\n" as *u8) 87 if lfd >= 0 { g_fp(lfd, "PRIVGATE verdict=RED gated=" as *u8); g_fn(lfd, gated_ok); g_fp(lfd, " control=" as *u8); g_fn(lfd, control_ok); g_fp(lfd, "\n" as *u8); sys_close(lfd) } 88 sys_exit(1) 89 return 1 90}