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Commit Graph

Author	SHA1	Message	Date
Alessandro Decina	11c227743d	bpf: improve bpf_probe_read_kernel_str_bytes and bpf_probe_read_user_str_bytes This change does a few things: - it fixes a bug in the wrappers, where we were expecting the kernel to return len=1 for b"\0" where it instead returns 0 and doesn't write out the NULL terminator - it makes the helpers more robust by hardcoding bound checks in assembly so that LLVM optimizations can't transform the checks in a way that the verifier can't understand. - it adds integration tests	1 year ago

Author

SHA1

Message

Date

Alessandro Decina

11c227743d

bpf: improve bpf_probe_read_kernel_str_bytes and bpf_probe_read_user_str_bytes

This change does a few things:

- it fixes a bug in the wrappers, where we were expecting the kernel to
  return len=1 for b"\0" where it instead returns 0 and doesn't write
  out the NULL terminator

- it makes the helpers more robust by hardcoding bound checks in
  assembly so that LLVM optimizations can't transform the checks in a
  way that the verifier can't understand.

- it adds integration tests

1 Commits (6e9aba55fe8d23aa337b29a1cab890bb54816068)