[Bug nptl/28458] New: pthread_setspecific rejects pseudo pointers

["jan.kiszka at siemens dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28458

            Bug ID: 28458
           Summary: pthread_setspecific rejects pseudo pointers
           Product: glibc
           Version: 2.34
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kiszka at siemens dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Since a1561c3bbe8e72c6e44280d1eb5e529d2da4ecd0, pthread_setspecific started to
reject pseudo pointers like (const void *)1L:

printf.c:732:9: error: 'pthread_setspecific' expecting 1 byte in a region of
size 0 [-Werror=stringop-overread]
  732 |         pthread_setspecific(cleanup_key, (const void *)1);

This breaks existing code that wants to signal special conditions to key
readers ("not an object") or want to use pthread_key_create to register a
per-thread destructor. These issues can be worked around, but users will be
confronted with valid but no longer compiling code first of all.

Reading the Open Group spec on this, I do not find any hint that suggests only
NULL or valid pointers must be passed to pthread_setspecific.

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