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…arguments Fixes voidzero-dev#699 The heap branch of `with_argv` allocated exactly `argc` slots, then wrote the closing NULL at `out[argc]`. That panicked inside an `extern "C"` interposer, which aborted the traced process. Allocate `argc + 1` slots. Co-authored-by: DeepSeek V4.1 Flash <noreply@deepseek.com> Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Fixes #699
Motivation
with_argvbuilds the argv array forexecl,execlpandexecle. With 32 or more arguments it takes the heap branch, which allocated exactlyargcslots and then wrote the closing NULL atout[argc]. That index panicked inside anextern "C"interposer, which aborted the traced process.Change
argc + 1slots in the heap branch, so the NULL terminator has room.crates/fspy/tests/execl_many_args.rscallsexeclwith 40 arguments under fspy and checks the child exits normally. It aborts without the fix.