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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/28407] pthread_kill assumes that kill (getpid ()) is
 equivalent to tgkill (getpid (), gettid())
Date: Thu, 21 Oct 2021 13:30:11 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28407

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.35
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Fixed for glibc 2.35 via:

commit eae81d70574e923ce3c59078b8df857ae192efa6
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Oct 1 18:16:41 2021 +0200

    nptl: pthread_kill must send signals to a specific thread [BZ #28407]

    The choice between the kill vs tgkill system calls is not just about
    the TID reuse race, but also about whether the signal is sent to the
    whole process (and any thread in it) or to a specific thread.

    This was caught by the openposix test suite:

      LTP: openposix test suite - FAIL: SIGUSR1 is member of new thread
pendingset.
      <https://gitlab.com/cki-project/kernel-tests/-/issues/764>

    Fixes commit 526c3cf11ee9367344b6b15d669e4c3cb461a2be ("nptl: Fix race
    between pthread_kill and thread exit (bug 12889)").

    Reviewed-by: Carlos O'Donell <carlos@redhat.com>
    Tested-by: Carlos O'Donell <carlos@redhat.com>

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