From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-3.3 required=5.0 tests=MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 14304 invoked from network); 16 Aug 2020 16:56:57 -0000 Received: from mother.openwall.net (195.42.179.200) by inbox.vuxu.org with ESMTPUTF8; 16 Aug 2020 16:56:57 -0000 Received: (qmail 28281 invoked by uid 550); 16 Aug 2020 16:56:56 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Reply-To: musl@lists.openwall.com Received: (qmail 28252 invoked from network); 16 Aug 2020 16:56:55 -0000 Date: Sun, 16 Aug 2020 12:56:42 -0400 From: Rich Felker To: musl@lists.openwall.com Message-ID: <20200816165642.GZ3265@brightrain.aerifal.cx> References: <20200814214136.GP3265@brightrain.aerifal.cx> <20200816035759.GW3265@brightrain.aerifal.cx> <87h7t3j6r6.fsf@mid.deneb.enyo.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87h7t3j6r6.fsf@mid.deneb.enyo.de> User-Agent: Mutt/1.5.21 (2010-09-15) Subject: Re: [musl] Restrictions on child context after multithreaded fork On Sun, Aug 16, 2020 at 11:10:37AM +0200, Florian Weimer wrote: > * Rich Felker: > > > On some inspection, glibc does not actually attempt to make the child > > environment unrestricted. The only things it does around fork are: > > I think pthread_once initializers that have partially executed are > also executed from the start in the child if initialization is > requested again. I don't follow how pthread_once is related. The vast majority of the things I found glibc doing no specific handling for are actual mutable state not just on-demand initialization. Rich