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talloc_stackframe_internal() calls SMB_THREAD_GET_TLS(global_ts) which
calls smb_get_tls_pthread() in the POSIX pthread wrapper implementation.
If SMB_THREAD_SET_TLS() hasn't been called before, global_ts is NULL and
smb_get_tls_pthread dereferences it so it crashes.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=13505
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
- Create separate macros for lock and unlock so that it's easier to identify
which request is being made.
- Initialize *ponce in the SMB_THREAD_ONCE macro in the non-thread-safe case,
rather than requiring each init function to determine if it's in the
non-thread-safe case and manually initialize.
Derrell
- This should make life easier for ourselves. We're no longer constrained to
the semantics of pthread_once, so let's allow passing a parameter to the
initialization function. Some of Samba's init functions return a
value. Although I haven't searched, I suspect that some of the init
functions require in input parameters. The parameter added here can be used
for input, output, or both, as necessary... or ignored, as is now done in
talloc_stackframe_init().
Derrell
- Internally, when locking or unlocking a mutex, we'll pass one of the
values of enum smb_thread_lock_type. That enum is not available to users
providing a thread implementation. Externally, we'll document the integer
values which will be passed to their lock_mutex function, but not require
them to access our internal header file.
Derrell
Jeremy, please check...
- I'm in the process of providing an interface in libsmbclient to the
recently-added threading capabilities. In the process, I discovered that
different thread implementations have varying types for the variable passed
to the thread_impl_once() function. pthreads, for example, uses type
pthread_once_t. Since Samba needs to internally declare these variables, it
would need to know the exact type required by each thread implementation's
function. After considering multiple methods of obtaining an appropriately
sized variable, I decided that for the basic "once" functionality required
by Samba, it would be much simpler to just implement our own "once"
functionality. We don't require cancellation points et all. This commit adds
an smb_thread_once() function that is implemented using an internal
mutex. The mutex itself uses the implementation's create_mutex
function. This eliminates the need for the user to provide a smb_thread_once
function pointer and the entire issue of that function's first parameter.
Derrell
What a difference a name makes... :-). Just because something is missnamed
SAMR_ACCESS_OPEN_DOMAIN, when it should actually be SAMR_ACCESS_LOOKUP_DOMAIN,
don't automatically use it for a security check in _samr_OpenDomain().
Jeremy.
