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| author | Brent Cook <bcook@openbsd.org> | 2014-10-27 19:22:03 -0500 |
|---|---|---|
| committer | Brent Cook <bcook@openbsd.org> | 2014-11-03 01:19:36 -0600 |
| commit | 0aeb93b9fc9ecf0f9c2e98444545de485168823d (patch) | |
| tree | 605cc1566e5c0ad6698c076b9d5dc2ebeb3f705d /include | |
| parent | 8abf8e1e1577f51deb5c3bc01f076205f1bfb268 (diff) | |
| download | portable-0aeb93b9fc9ecf0f9c2e98444545de485168823d.tar.gz portable-0aeb93b9fc9ecf0f9c2e98444545de485168823d.tar.bz2 portable-0aeb93b9fc9ecf0f9c2e98444545de485168823d.zip | |
override native arc4random_buf on FreeBSD
The FreeBSD-native arc4random_buf implementation falls back to weak
sources of entropy if the sysctl fails. Remove these dangerous fallbacks
by overriding locally.
Unfortunately, pthread_atfork() is broken on FreeBSD (at least 9 and 10)
if a program does not link to -lthr. Callbacks registered with
pthread_atfork() simply fail silently. So, it is not always possible to
detect a PID wraparound. I wish we could do better.
This improves arc4random_buf's safety compared to the native FreeBSD
implementation. Tested on FreeBSD 9 and 10.
ok beck@ deraadt@
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions