File size: 1,962 Bytes
00df61d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | /**
* @license
* Copyright 2019 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
#if STACK_OVERFLOW_CHECK
// Initializes the stack cookie. Called at the startup of main and at the startup of each thread in pthreads mode.
function writeStackCookie() {
var max = _emscripten_stack_get_end();
#if RUNTIME_DEBUG
dbg(`writeStackCookie: ${ptrToString(max)}`);
#endif
#if ASSERTIONS
assert((max & 3) == 0);
#endif
// If the stack ends at address zero we write our cookies 4 bytes into the
// stack. This prevents interference with SAFE_HEAP and ASAN which also
// monitor writes to address zero.
if (max == 0) {
max += 4;
}
// The stack grow downwards towards _emscripten_stack_get_end.
// We write cookies to the final two words in the stack and detect if they are
// ever overwritten.
{{{ makeSetValue('max', 0, '0x02135467', 'u32') }}};
{{{ makeSetValue('max', 4, '0x89BACDFE', 'u32') }}};
#if CHECK_NULL_WRITES
// Also test the global address 0 for integrity.
{{{ makeSetValue(0, 0, 0x63736d65 /* 'emsc' */, 'u32') }}};
#endif
}
function checkStackCookie() {
#if !MINIMAL_RUNTIME
if (ABORT) return;
#endif
var max = _emscripten_stack_get_end();
#if RUNTIME_DEBUG >= 2
dbg(`checkStackCookie: ${ptrToString(max)}`);
#endif
// See writeStackCookie().
if (max == 0) {
max += 4;
}
var cookie1 = {{{ makeGetValue('max', 0, 'u32') }}};
var cookie2 = {{{ makeGetValue('max', 4, 'u32') }}};
if (cookie1 != 0x02135467 || cookie2 != 0x89BACDFE) {
abort(`Stack overflow! Stack cookie has been overwritten at ${ptrToString(max)}, expected hex dwords 0x89BACDFE and 0x2135467, but received ${ptrToString(cookie2)} ${ptrToString(cookie1)}`);
}
#if CHECK_NULL_WRITES
// Also test the global address 0 for integrity.
if ({{{ makeGetValue(0, 0, 'u32') }}} != 0x63736d65 /* 'emsc' */) {
abort('Runtime error: The application has corrupted its heap memory area (address zero)!');
}
#endif
}
#endif
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