/go-darwin-dyld

Primary LanguageC

go-darwin-dyld

This repo reproduces a bug executing when executing a binary with Go exec.Command on macOS using with DYLD_INSERT_LIBRARIES. The binary segfaults.

What should happen: run via shell

When executing a binary with DYLD_INSERT_LIBRARIES set, the binary should run normally.

Notably, running the same binary using the shell doesn't segfault.

make run_shell # runs file_ops.c

# Output:
# !!! init dyld_inserted library
# successfully wrote tmp file: $TMPDIR/open_a

What actually happens: run via Go exec.Command

make run_go # runs main.go

# Output:
# err: signal: segmentation fault

The bug is related to DYLD_INSERT_LIBRARIES. To run exec.Command without the DYLD_INSERT_LIBRARIES env var set, run:

make skip_dyld=1 run_go

# Output:
# running  /opt/p/go-darwin-dyld/file_ops
# output: successfully wrote tmp file: $TMPDIR/open_a