SIGSEGV: right shift of a negative number

crashappsec / libcon4m

Base Compiler and Runtime Support for con4m

Apache License 2.0

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SIGSEGV: right shift of a negative number #71

Closed ee7 closed 1 week ago

ee7 commented 2 weeks ago

With:

libcon4m b4fdc8e2e70b0ef18a554562702e2db1e0c9aff0
The macos-14 GitHub runner (aarch64, with clang 15).

Example

x = -1

x >>= 0
print(x)

Expected behavior

Outputs -1.

Current behavior

Crashes.

viega commented 1 week ago

I didn't change anything here, but it seems to be working using my current PR.

There were lots of indirect issues that could pop up that were really due to what I found and fixed with my new memory checking stuff (in #78). Unfortunately, ASAN didn't detect it, even when I integrated with their API.

But this was probably a consequence.