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Re: (ITS#7022) Patch - Mozilla NSS - NSS_Init* functions are not thread safe
- To: openldap-its@OpenLDAP.org
- Subject: Re: (ITS#7022) Patch - Mozilla NSS - NSS_Init* functions are not thread safe
- From: firstname.lastname@example.org
- Date: Wed, 24 Aug 2011 22:35:10 GMT
- Auto-submitted: auto-generated (OpenLDAP-ITS)
> Full_Name: Rich Megginson
> Version: current tip of master branch
> OS: RHEL6
> URL: ftp://ftp.openldap.org/incoming/0001-NSS_Init-functions-are-not-thread-safe.patch
> Submission from: (NULL) (126.96.36.199)
> The NSS_InitContext et. al, and their corresponding shutdown functions,
> are not thread safe. There can only be one thread at a time calling
> these functions. Protect the calls with a mutex. Create the mutex
> using a PR_CallOnce to ensure that the mutex is only created once and
> not used before created. Move the registration of the nss shutdown
> callback to also use a PR_CallOnce. Removed the call to
> SSL_ClearSessionCache() because it is always called at shutdown, and we must
> not call it more than once.
We generally assume that all initialization is done before threads are
spawned. I seem to recall this is a requirement for GnuTLS, anyway.
I've applied this patch but it has a few issues. E.g., the LDAP_MUTEX macros
are already defined relative to LDAP_R_COMPILE so they do not need to be
protected by ifdefs. In fact the macros are there specifically to eliminate
all of those ifdefs.
A couple of whitespace strangenesses too. I'll fix these here, thanks for the
> These patch files are derived from OpenLDAP Software. All of the
> modifications to OpenLDAP Software represented in the following
> patch(es) were developed by Red Hat. Red Hat has not assigned rights
> and/or interest in this work to any party. I, Rich Megginson am
> authorized by Red Hat, my employer, to release this work under the
> following terms.
> Red Hat hereby place the following modifications to OpenLDAP Software
> (and only these modifications) into the public domain. Hence, these
> modifications may be freely used and/or redistributed for any purpose
> with or without attribution and/or other notice.
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/