From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: walter@pelissero.de (Walter C. Pelissero) Newsgroups: gmane.emacs.bugs Subject: bug#10535: 23.3; starttls-negotiate-gnutls erases random buffer Date: Tue, 17 Jan 2012 13:35:32 +0100 Message-ID: <20245.27412.138376.596455@scylla.home.lan> Reply-To: walter@pelissero.de NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1326820086 12525 80.91.229.12 (17 Jan 2012 17:08:06 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 17 Jan 2012 17:08:06 +0000 (UTC) To: 10535@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Jan 17 18:08:00 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([140.186.70.17]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1RnCVs-0007Ab-DI for geb-bug-gnu-emacs@m.gmane.org; Tue, 17 Jan 2012 18:08:00 +0100 Original-Received: from localhost ([::1]:56317 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RnCVr-0005EQ-QI for geb-bug-gnu-emacs@m.gmane.org; Tue, 17 Jan 2012 12:07:59 -0500 Original-Received: from eggs.gnu.org ([140.186.70.92]:54818) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RnCV7-0005B7-5e for bug-gnu-emacs@gnu.org; Tue, 17 Jan 2012 12:07:20 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RnCUy-0000JV-Bn for bug-gnu-emacs@gnu.org; Tue, 17 Jan 2012 12:07:13 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:39102) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RnCUy-0000JR-80 for bug-gnu-emacs@gnu.org; Tue, 17 Jan 2012 12:07:04 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1RnCVw-0006m7-VO for bug-gnu-emacs@gnu.org; Tue, 17 Jan 2012 12:08:04 -0500 X-Loop: help-debbugs@gnu.org Resent-From: walter@pelissero.de (Walter C. 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X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Mailman-Approved-At: Tue, 17 Jan 2012 12:07:34 -0500 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 140.186.70.43 X-Mailman-Approved-At: Tue, 17 Jan 2012 12:07:56 -0500 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.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:55821 Archived-At: This bug report will be sent to the Free Software Foundation, not to your local site managers! Please write in English if possible, because the Emacs maintainers usually do not have translators to read other languages for them. Your report will be posted to the bug-gnu-emacs@gnu.org mailing list and the gnu.emacs.bug news group, and at http://debbugs.gnu.org. Please describe exactly what actions triggered the bug and the precise symptoms of the bug. If you can, give a recipe starting from `emacs -Q': starttls-negotiate-gnutls obliterates the contents of the second buffer in the buffers list. For instance a form like this may expose the bug: (jabber-starttls-connect '(:fsm jabber-connection :state :connecting :state-data (:send-function jabber-ssl-send :username "me" :server "jabme.de" :password "secret" :registerp nil :connection-type starttls :encrypted nil :network-server nil :port nil) :sleep 3 :deferred nil) "jabber.host" nil nil) I've noticed that the local variable `buffer' in starttls-negotiate-gnutls may contain a killed buffer, which I guessed it might be the source of the problem. In fact the following code erases the content of any writable buffer happening to be second in the buffers list: (let ((buffer (generate-new-buffer "foobar"))) (with-current-buffer buffer (kill-buffer buffer) (erase-buffer))) Although I don't know if the behaviour above is to be expected, the following patch seems to fix the problem at least in starttls. The patch, despite it's length, just checks that the buffer is still alive. diff -c -L /usr/local/share/emacs/23.3/lisp/gnus/starttls.el.gz -L /tmp/buffer-content-4772M2i /tmp/jka-com4772ZAp /tmp/buffer-content-4772M2i *** /usr/local/share/emacs/23.3/lisp/gnus/starttls.el.gz --- /tmp/buffer-content-4772M2i *************** *** 201,232 **** This should typically only be done once. It typically returns a multi-line informational message with information about the handshake, or nil on failure." ! (let (buffer info old-max done-ok done-bad) ! (if (null (setq buffer (process-buffer process))) ! ;; XXX How to remove/extract the TLS negotiation junk? ! (signal-process (process-id process) 'SIGALRM) ! (with-current-buffer buffer ! (save-excursion ! (setq old-max (goto-char (point-max))) ! (signal-process (process-id process) 'SIGALRM) ! (while (and (processp process) ! (eq (process-status process) 'run) ! (save-excursion ! (goto-char old-max) ! (not (or (setq done-ok (re-search-forward ! starttls-success nil t)) ! (setq done-bad (re-search-forward ! starttls-failure nil t)))))) ! (accept-process-output process 1 100) ! (sit-for 0.1)) ! (setq info (buffer-substring-no-properties old-max (point-max))) ! (delete-region old-max (point-max)) ! (if (or (and done-ok (not done-bad)) ! ;; Prevent mitm that fake success msg after failure msg. ! (and done-ok done-bad (< done-ok done-bad))) ! info ! (message "STARTTLS negotiation failed: %s" info) ! nil)))))) (defun starttls-negotiate (process) (if starttls-use-gnutls --- 201,233 ---- This should typically only be done once. It typically returns a multi-line informational message with information about the handshake, or nil on failure." ! (let ((buffer (process-buffer process)) ! info old-max done-ok done-bad) ! (if (and buffer (buffer-live-p buffer)) ! (with-current-buffer buffer ! (save-excursion ! (setq old-max (goto-char (point-max))) ! (signal-process (process-id process) 'SIGALRM) ! (while (and (processp process) ! (eq (process-status process) 'run) ! (save-excursion ! (goto-char old-max) ! (not (or (setq done-ok (re-search-forward ! starttls-success nil t)) ! (setq done-bad (re-search-forward ! starttls-failure nil t)))))) ! (accept-process-output process 1 100) ! (sit-for 0.1)) ! (setq info (buffer-substring-no-properties old-max (point-max))) ! (delete-region old-max (point-max)) ! (if (or (and done-ok (not done-bad)) ! ;; Prevent mitm that fake success msg after failure msg. ! (and done-ok done-bad (< done-ok done-bad))) ! info ! (message "STARTTLS negotiation failed: %s" info) ! nil))) ! ;; XXX How to remove/extract the TLS negotiation junk? ! (signal-process (process-id process) 'SIGALRM)))) (defun starttls-negotiate (process) (if starttls-use-gnutls If Emacs crashed, and you have the Emacs process in the gdb debugger, please include the output from the following gdb commands: `bt full' and `xbacktrace'. For information about debugging Emacs, please read the file /usr/local/share/emacs/23.3/etc/DEBUG. In GNU Emacs 23.3.1 (amd64-portbld-freebsd8.2, GTK+ Version 2.24.6) of 2012-01-04 on scylla.home.lan Windowing system distributor `The X.Org Foundation', version 11.0.10707000 configured using `configure '--localstatedir=/var' '--with-x-toolkit=gtk' '--x-libraries=/usr/local/lib' '--x-includes=/usr/local/include' '--prefix=/usr/local' '--mandir=/usr/local/man' '--infodir=/usr/local/info/' '--build=amd64-portbld-freebsd8.2' 'build_alias=amd64-portbld-freebsd8.2' 'CC=cc' 'CFLAGS=-O2 -pipe -fno-strict-aliasing' 'LDFLAGS= -L/usr/local/lib -rpath=/usr/local/lib' 'CPPFLAGS=-I/usr/local/include' 'CPP=cpp'' Important settings: value of $LC_ALL: nil value of $LC_COLLATE: nil value of $LC_CTYPE: en_GB.ISO8859-15 value of $LC_MESSAGES: nil value of $LC_MONETARY: nil value of $LC_NUMERIC: nil value of $LC_TIME: nil value of $LANG: en_GB.ISO8859-15 value of $XMODIFIERS: nil locale-coding-system: iso-latin-9-unix default enable-multibyte-characters: t Major mode: Text Minor modes in effect: flyspell-mode: t show-paren-mode: t iswitchb-mode: t tooltip-mode: t mouse-wheel-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: M-f M-f M-f s M-< M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f M-f , SPC w h i c h SPC m a y SPC b e SPC t h e SPC o s o u r c e SPC o f SPC t h e SPC p r o b l e m . M-b C-s C-w C-e b u g C-s C-s SPC t h e M-q C-x C-s M-x r e p o r t Recent messages: Mark set Auto-saving...done call-interactively: Beginning of buffer Mark set [2 times] Auto-saving...done Mark saved where search started [2 times] Saving file /usr/home/wcp/tmp/bug-report... Wrote /usr/home/wcp/tmp/bug-report Making completion list... Scanning for dabbrevs...99% Load-path shadows: /usr/home/wcp/emacs/slime/contrib/bridge hides /usr/home/wcp/emacs/ilisp/bridge /usr/local/share/emacs/site-lisp/CJK/emacs/cjk-enc hides /usr/local/share/emacs/site-lisp/CJK/mule-2.3/cjk-enc /usr/local/share/emacs/23.3/site-lisp/semi/pgg-gpg hides /usr/local/share/emacs/23.3/lisp/pgg-gpg /usr/local/share/emacs/23.3/site-lisp/semi/pgg-parse hides /usr/local/share/emacs/23.3/lisp/pgg-parse /usr/local/share/emacs/23.3/site-lisp/flim/md4 hides /usr/local/share/emacs/23.3/lisp/md4 /usr/local/share/emacs/23.3/site-lisp/flim/sha1 hides /usr/local/share/emacs/23.3/lisp/sha1 /usr/local/share/emacs/23.3/site-lisp/semi/pgg-pgp5 hides /usr/local/share/emacs/23.3/lisp/pgg-pgp5 /usr/home/wcp/emacs/desktop hides /usr/local/share/emacs/23.3/lisp/desktop /usr/local/share/emacs/23.3/site-lisp/semi/pgg hides /usr/local/share/emacs/23.3/lisp/pgg /usr/local/share/emacs/23.3/site-lisp/flim/hex-util hides /usr/local/share/emacs/23.3/lisp/hex-util /usr/local/share/emacs/23.3/site-lisp/semi/pgg-pgp hides /usr/local/share/emacs/23.3/lisp/pgg-pgp /usr/local/share/emacs/23.3/site-lisp/semi/pgg-def hides /usr/local/share/emacs/23.3/lisp/pgg-def /usr/home/wcp/emacs/url/lisp/vc-dav hides /usr/local/share/emacs/23.3/lisp/vc-dav /usr/home/wcp/emacs/url/lisp/url-nfs hides /usr/local/share/emacs/23.3/lisp/url/url-nfs /usr/home/wcp/emacs/url/lisp/url-dired hides /usr/local/share/emacs/23.3/lisp/url/url-dired /usr/home/wcp/emacs/url/lisp/url-cookie hides /usr/local/share/emacs/23.3/lisp/url/url-cookie /usr/home/wcp/emacs/url/lisp/url-file hides /usr/local/share/emacs/23.3/lisp/url/url-file /usr/home/wcp/emacs/url/lisp/url-gw hides /usr/local/share/emacs/23.3/lisp/url/url-gw /usr/home/wcp/emacs/url/lisp/url-news hides /usr/local/share/emacs/23.3/lisp/url/url-news /usr/home/wcp/emacs/url/lisp/url-history hides /usr/local/share/emacs/23.3/lisp/url/url-history /usr/home/wcp/emacs/url/lisp/url hides /usr/local/share/emacs/23.3/lisp/url/url /usr/home/wcp/emacs/url/lisp/url-handlers hides /usr/local/share/emacs/23.3/lisp/url/url-handlers /usr/home/wcp/emacs/url/lisp/url-misc hides /usr/local/share/emacs/23.3/lisp/url/url-misc /usr/home/wcp/emacs/url/lisp/url-cid hides /usr/local/share/emacs/23.3/lisp/url/url-cid /usr/home/wcp/emacs/url/lisp/url-http hides /usr/local/share/emacs/23.3/lisp/url/url-http /usr/home/wcp/emacs/url/lisp/url-proxy hides /usr/local/share/emacs/23.3/lisp/url/url-proxy /usr/home/wcp/emacs/url/lisp/url-methods hides /usr/local/share/emacs/23.3/lisp/url/url-methods /usr/home/wcp/emacs/url/lisp/url-util hides /usr/local/share/emacs/23.3/lisp/url/url-util /usr/home/wcp/emacs/url/lisp/url-cache hides /usr/local/share/emacs/23.3/lisp/url/url-cache /usr/home/wcp/emacs/url/lisp/url-expand hides /usr/local/share/emacs/23.3/lisp/url/url-expand /usr/home/wcp/emacs/url/lisp/url-ftp hides /usr/local/share/emacs/23.3/lisp/url/url-ftp /usr/home/wcp/emacs/url/lisp/url-ns hides /usr/local/share/emacs/23.3/lisp/url/url-ns /usr/home/wcp/emacs/url/lisp/url-dav hides /usr/local/share/emacs/23.3/lisp/url/url-dav /usr/home/wcp/emacs/url/lisp/url-vars hides /usr/local/share/emacs/23.3/lisp/url/url-vars /usr/home/wcp/emacs/url/lisp/url-parse hides /usr/local/share/emacs/23.3/lisp/url/url-parse /usr/home/wcp/emacs/url/lisp/url-ldap hides /usr/local/share/emacs/23.3/lisp/url/url-ldap /usr/home/wcp/emacs/url/lisp/url-imap hides /usr/local/share/emacs/23.3/lisp/url/url-imap /usr/home/wcp/emacs/url/lisp/url-auth hides /usr/local/share/emacs/23.3/lisp/url/url-auth /usr/home/wcp/emacs/url/lisp/url-about hides /usr/local/share/emacs/23.3/lisp/url/url-about /usr/home/wcp/emacs/url/lisp/url-mailto hides /usr/local/share/emacs/23.3/lisp/url/url-mailto /usr/home/wcp/emacs/url/lisp/url-privacy hides /usr/local/share/emacs/23.3/lisp/url/url-privacy /usr/home/wcp/emacs/url/lisp/url-irc hides /usr/local/share/emacs/23.3/lisp/url/url-irc /usr/local/share/emacs/23.3/site-lisp/flim/sasl-ntlm hides /usr/local/share/emacs/23.3/lisp/net/sasl-ntlm /usr/local/share/emacs/23.3/site-lisp/flim/hmac-def hides /usr/local/share/emacs/23.3/lisp/net/hmac-def /usr/local/share/emacs/23.3/site-lisp/flim/sasl-digest hides /usr/local/share/emacs/23.3/lisp/net/sasl-digest /usr/local/share/emacs/23.3/site-lisp/flim/sasl hides /usr/local/share/emacs/23.3/lisp/net/sasl /usr/local/share/emacs/23.3/site-lisp/flim/ntlm hides /usr/local/share/emacs/23.3/lisp/net/ntlm /usr/local/share/emacs/23.3/site-lisp/flim/sasl-cram hides /usr/local/share/emacs/23.3/lisp/net/sasl-cram /usr/local/share/emacs/23.3/site-lisp/flim/hmac-md5 hides /usr/local/share/emacs/23.3/lisp/net/hmac-md5 /usr/local/share/emacs/site-lisp/CJK/emacs/thai-word hides /usr/local/share/emacs/23.3/lisp/language/thai-word /usr/local/share/emacs/23.3/site-lisp/semi/smime hides /usr/local/share/emacs/23.3/lisp/gnus/smime Features: (shadow emacsbug debug multi-isearch dabbrev dictionary link connection mail-utils newcomment quail mailalias flyspell ispell vm-reply help-mode view time-stamp vm-virtual vm-delete bbdb-gui vm-save vm-rfaddons vm-menu vm-window vm-toolbar vm-folder vm-mime vm-undo vm-mouse vm-page vm-minibuf vm-message vm-misc vm-macro bbdb-vm vm-summary vm-motion vm-autoload bbdb-snarf mail-extr bbdb-com mailabbrev vm arc-mode archive-mode make-mode css-mode sh-script eldoc face-remap copyright darcsum executable pcomplete pcmpl-darcs compile slime-asdf warnings slime-fancy slime-fontifying-fu slime-package-fu slime-references slime-scratch slime-presentations slime-fuzzy slime-fancy-inspector slime-c-p-c slime-editing-commands slime-autodoc advice advice-preload slime-parse slime-repl slime byte-opt bytecomp byte-compile derived apropos help-fns edmacro kmacro easy-mmode hideshow pp hyperspec thingatpt gobbol submit-cv mailcrypt rfc822 comint ring html-extensions sgml-mode autoinsert skeleton jabber-chat ewoc jabber-menu jabber-history jabber-chatbuffer jabber-keymap jabber-core jabber-sasl sasl sasl-anonymous sasl-login sasl-plain fsm jabber-conn srv dns starttls tls jabber-logon sha1 sha1-el hex-util jabber-xml xml jabber-util mail-parse rfc2231 rfc2047 rfc2045 qp ietf-drums mm-util time-date mail-prsvr smtpmail sendmail server jka-compr desktop reporter dired regexp-opt info paren avoid iswitchb cus-start cus-load bbdb-autoloads bbdb timezone color-theme easymenu wid-edit tapestry vm-autoloads vm-vars vm-version browse-url vc vc-dispatcher cl cl-19 jabber-autoloads tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd font-setting tool-bar dnd fontset image fringe lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mldrag mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button minibuffer faces cus-face files text-properties overlay md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process dbusbind system-font-setting font-render-setting gtk x-toolkit x multi-tty emacs) -- http://pelissero.de