Skip to Content [alt-c]

Comment

In reply to Comment by Reader x

Andrew Ayer on 2014-07-15 at 01:15:

pthread_atfork() requires linking with libpthread, which a single-threaded program would not normally do. Otherwise, it's not a bad suggestion. Checking process creation time is a very interesting suggestion (not perfect due to clock changes but still pretty darn good). Can it be done without needing to read /proc, which wouldn't exist in a chroot jail?

Still, on top of everything LibreSSL does to automatically detect forks, it should still expose a way to explicitly reseed the PRNG in an OpenSSL-compatible way, since OpenSSL has made guarantees that certain functions will re-seed the PRNG, and there may be some scenarios where even the best automatic fork detection fails (imagine a program calling the clone syscall directly for whatever reason, in which case pthread_atfork handlers won't be called). Since LibreSSL is billed as a drop-in replacement for OpenSSL, you should not be able to write a valid program that's safe under OpenSSL's guarantees but not when linked with LibreSSL.

Reply

Post a Reply

Your comment will be public. If you would like to contact me privately, please email me. Please keep your comment on-topic, polite, and comprehensible.

(Optional; will be published)

(Optional; will not be published)

(Optional; will be published)

  • Blank lines separate paragraphs.
  • Lines starting with ">" are indented as block quotes.
  • Lines starting with two spaces are reproduced verbatim.
  • Text surrounded by *asterisks* is italicized.
  • Text surrounded by `back ticks` is monospaced.
  • URLs are turned into links.
  • Use the Preview button to check your formatting.