Benjamin Bannier created MESOS-6216:

             Summary: LibeventSSLSocketImpl::create is not thread-safe, but 
used as if it were
                 Key: MESOS-6216
             Project: Mesos
          Issue Type: Bug
          Components: security
            Reporter: Benjamin Bannier

{{LibeventSSLSocketImpl::create}} is called whenever a potentially ssl-enabled 
socket is created. It in turn calls {{openssl::initialize}} which calls a 
function {{reinitialize}} using {{os::setenv}}. Here {{os::setenv}} is used to 
set up SSL-related libprocess environment variables {{LIBPROCESS_SSL_*}}.

Since {{os::setenv}} is not thread-safe just like the {{::setenv}} it wraps, 
any code calling functions like {{os::getenv}} (via or {{os::environment}}) 
concurrently with the first invocation of {{LibeventSSLSocketImpl::create}} 
perform unsynchronized r/w access to the same data structure in the runtime.

We usually perform most setup of the environment before we start the libprocess 
runtime with {{process::initialize}} from a {{main}} function, see e.g., 
{{src/slave/main.cpp}} or {{src/master/main.cpp}} and others. It appears that 
we should move the setup of libprocess' SSL environment variables to a similar 

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