From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#53136: 28.0.90; segfault in lock_file Date: Sun, 09 Jan 2022 09:36:36 +0200 Message-ID: <83bl0l2we3.fsf@gnu.org> References: <871r1hv40o.fsf.ref@yahoo.com> <871r1hv40o.fsf@yahoo.com> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="12999"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 53136@debbugs.gnu.org To: Po Lu Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jan 09 08:38:33 2022 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1n6Sme-0003B2-Nm for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 09 Jan 2022 08:38:32 +0100 Original-Received: from localhost ([::1]:47786 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n6Smd-0002Dv-EM for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 09 Jan 2022 02:38:31 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:43126) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n6SmF-0002Dk-75 for bug-gnu-emacs@gnu.org; Sun, 09 Jan 2022 02:38:07 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:56226) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1n6SmA-000154-6R for bug-gnu-emacs@gnu.org; Sun, 09 Jan 2022 02:38:06 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1n6SmA-0004kf-2W for bug-gnu-emacs@gnu.org; Sun, 09 Jan 2022 02:38:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 09 Jan 2022 07:38:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 53136 X-GNU-PR-Package: emacs Original-Received: via spool by 53136-submit@debbugs.gnu.org id=B53136.164171383118206 (code B ref 53136); Sun, 09 Jan 2022 07:38:02 +0000 Original-Received: (at 53136) by debbugs.gnu.org; 9 Jan 2022 07:37:11 +0000 Original-Received: from localhost ([127.0.0.1]:49129 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1n6SlK-0004ja-N5 for submit@debbugs.gnu.org; Sun, 09 Jan 2022 02:37:10 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:42286) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1n6SlG-0004j6-I2 for 53136@debbugs.gnu.org; Sun, 09 Jan 2022 02:37:08 -0500 Original-Received: from [2001:470:142:3::e] (port=50470 helo=fencepost.gnu.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n6SlB-00012t-AH; Sun, 09 Jan 2022 02:37:01 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=gTU2I2MsuCNB0rjof583CxvwssL0wHHdtiSrMbpmzno=; b=OvLSusYGH7/q /I4a+u5348TiG8GvVV2xtde0ayS5yWt1GFkjhjxsfPbdFqG0MXUy5iQRgN8uz584W7kIfya7FtB+f HVd5m1hk+Bqkm4Kalhfr7p3vRw6pigyXZmSHqy3AEfpUGiAx2Yr5ZUg4MmCW1baZN3dMHBuQGl/ro tIMPutwZwKHCMxK61zXgs15Wwwbj5bzTuPE+zQxz4Efkcon6RMF/4hb3ldsb6yOvUJAjqUncOlSBe EhhtYW6rySZMgv3ON4a6ONWKdLs2K7ZYZ3513Jw+WvDEJUZL9Q5sVSinqiisOv3ydIPjC3eqTWt0O 82QgFgSbtGMpn6GzGiLPVA==; Original-Received: from [87.69.77.57] (port=4489 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n6Sl0-0002rw-AO; Sun, 09 Jan 2022 02:36:58 -0500 In-Reply-To: <871r1hv40o.fsf@yahoo.com> (bug-gnu-emacs@gnu.org) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:223832 Archived-At: > Resent-From: Po Lu > Original-Sender: "Debbugs-submit" > Resent-CC: bug-gnu-emacs@gnu.org > Resent-Sender: help-debbugs@gnu.org > Date: Sun, 09 Jan 2022 14:04:23 +0800 > From: Po Lu via "Bug reports for GNU Emacs, > the Swiss army knife of text editors" > > This write in `lock_file': > > memcpy (dot, replacement, replacementlen); > > Ends up writing one byte outside dot. > > I could not find the problem, but someone else may want to take a look. Details, please: the values of all the relevant variables at that point, including the contents of all the string variables. And what is your value of MAX_LFINFO? I don't see how this can be efficiently investigated without this data. In particular, 'dot' has no storage of its own, it's just a pointer into the lock_info.user[] array.