[Bug time/19179] New: gmtime_r internally calls getenv("TZ") which is not thread-safe

["nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19179

            Bug ID: 19179
           Summary: gmtime_r internally calls getenv("TZ") which is not
                    thread-safe
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: time
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
  Target Milestone: ---

gmtime_r should be thread-safe, but it calls tzset_internal which calls
getenv("TZ") which is non-thread-safe.

a multi-threaded application may modify the TZ env var through the
environ pointer if there is no concurrent access to this env var in
other threads.

gmtime_r is not specified to access TZ, if it does, that can introduce
a data race in a conforming application and gmtime_r may misbehave if
it observes TZ in an inconsistent state.

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