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_PyPegen_raise_error_known_location() uses wrong build format #95876

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tiran opened this issue Aug 11, 2022 · 0 comments
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_PyPegen_raise_error_known_location() uses wrong build format #95876

tiran opened this issue Aug 11, 2022 · 0 comments
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@tiran @pablogsal
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3.11 3.12 type-bug

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tiran commented Aug 11, 2022

Bug report

_PyPegen_raise_error_known_location() uses Py_BuildValue() to generate a tuple for SyntaxError. The format string uses wrong values for all integer constants. lineno, col_number, end_lineno, and end_col_number are Py_ssize_t. The i format string handles int. This causes memory corruption on 64bit operation systems with strict ABI (e.g. wasm64).

cpython/Parser/pegen_errors.c

Lines 373 to 376 in b9e956f

}
tmp = Py_BuildValue("(OiiNii)", p->tok->filename, lineno, col_number, error_line, end_lineno, end_col_number);
if (!tmp) {
goto error;

I can reliable crash the interpreter with a syntax error like 1+=1. Notice the <ensc object at 0x1> in the object dump.

$ node --experimental-wasm-memory64 ./python.js -c "1+=1"
  File "<string>", line 1
object address  : 0x973e10
object refcount : 2
object type     : 0x2bc868
object type name: SyntaxError
object repr     : SyntaxError("'literal' is an illegal expression for augmented assignment", ('<string>', 1, 0, <ensc object at 0x1>, 10590200, 0))
lost sys.stderr
Aborted(Runtime error: The application has corrupted its heap memory area (address zero)!)
exiting due to exception: RuntimeError: Aborted(Runtime error: The application has corrupted its heap memory area (address zero)!),RuntimeError: Aborted(Runtime error: The application has corrupted its heap memory area (address zero)!)
    at abort (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:971:11)
    at checkStackCookie (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:733:47)
    at exitRuntime (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:800:3)
    at exitJS (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:7254:9)
    at callMain (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:9476:5)
    at doRun (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:9525:23)
    at run (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:9540:5)
    at runCaller (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:9448:19)
    at removeRunDependency (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:936:7)
    at receiveInstance (/home/heimes/dev/python/cpython/builddir/wasm64-emscripten-node-debug/python.js:1106:5)

The fix is trivial, use n instead of i. https://docs.python.org/3/c-api/arg.html#c.Py_BuildValue

Your environment

CPython main
wasm64-emscripten (EMSDK 3.1.18) with Node 16
@tiran tiran added type-bug 3.11 3.12 labels Aug 11, 2022
@tiran tiran self-assigned this Aug 11, 2022
tiran added a commit to tiran/cpython that referenced this issue Aug 11, 2022
@tiran
pythongh-95876: Fix format string in pegen error location code
59c3828
@bedevere-bot bedevere-bot mentioned this issue Aug 11, 2022
Merged
@tiran tiran mentioned this issue Aug 11, 2022
Open
pablogsal pushed a commit that referenced this issue Aug 11, 2022
@tiran
gh-95876: Fix format string in pegen error location code (#95877)
b4c857d
miss-islington pushed a commit to miss-islington/cpython that referenced this issue Aug 11, 2022
@tiran @miss-islington
pythongh-95876: Fix format string in pegen error location code (pytho…
383df7b 
…nGH-95877)

(cherry picked from commit b4c857d0fd74abb1ede6fe083c4fa3ca728b2b83)

Co-authored-by: Christian Heimes <christian@python.org>
@bedevere-bot bedevere-bot mentioned this issue Aug 11, 2022
Merged
miss-islington added a commit that referenced this issue Aug 11, 2022
@miss-islington @tiran
gh-95876: Fix format string in pegen error location code (GH-95877)
1221e8c 
(cherry picked from commit b4c857d)

Co-authored-by: Christian Heimes <christian@python.org>
@bedevere-bot bedevere-bot mentioned this issue Aug 11, 2022
Merged
tiran added a commit to tiran/cpython that referenced this issue Aug 11, 2022
@tiran
[3.10] pythongh-95876: Fix format string in pegen error location code (…
98c5309 
…pythonGH-95877).

(cherry picked from commit b4c857d)

Co-authored-by: Christian Heimes <christian@python.org>
miss-islington pushed a commit that referenced this issue Aug 11, 2022
@tiran
[3.10] gh-95876: Fix format string in pegen error location code (GH-9…
2a6b67f 
…5877 (GH-95901)

(cherry picked from commit b4c857d)

Co-authored-by: Christian Heimes <christian@python.org>
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