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Thu, 3 Apr 2025 02:33:55 -0400 (EDT) From: Kyle Ambroff-Kao <kyle@HIDDEN> Date: Wed, 02 Apr 2025 23:33:54 -0700 Message-ID: <86cydtg3e5.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" Received-SPF: pass client-ip=103.168.172.145; envelope-from=kyle@HIDDEN; helo=fout-a2-smtp.messagingengine.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: 0.7 (/) X-Mailman-Approved-At: Thu, 03 Apr 2025 02:55:50 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.3 (/) --=-=-= Content-Type: text/plain Tags: patch Fix use-after-free bug in the Haiku font driver * src/haikufont.c: Set objects freed with haikufont_close to NULL so they will not be reused, which seems to happen in daemon mode when all frames have been closed and fonts are garbage collected. In GNU Emacs 30.1 (build 2, amd64-portbld-freebsd15.0, GTK+ Version 3.24.48, cairo version 1.18.2) System Description: 15.0-CURRENT Configured using: 'configure --disable-build-details --localstatedir=/var --without-gconf --without-libsystemd --without-selinux --with-x --enable-acl --with-cairo --with-dbus --with-gif --with-gnutls --with-gsettings --with-x-toolkit=gtk3 --with-harfbuzz --with-jpeg --with-file-notification=kqueue --with-lcms2 --without-m17n-flt --without-imagemagick --with-mailutils --with-modules --with-native-compilation=aot --with-sound=oss --without-libotf --without-pgtk --with-png --with-toolkit-scroll-bars --with-sqlite3 --with-rsvg --with-threads --with-tiff --with-tree-sitter --with-webp --without-xft --with-xim --with-xml2 --with-xpm --without-xwidgets --x-libraries=/usr/local/lib --x-includes=/usr/local/include --prefix=/usr/local --mandir=/usr/local/share/man --disable-silent-rules --infodir=/usr/local/share/emacs/info/ --build=amd64-portbld-freebsd15.0 'CFLAGS=-O2 -pipe -fstack-protector-strong -Wl,-rpath=/usr/local/lib/gcc13 -isystem /usr/local/include -fno-strict-aliasing ' 'CPPFLAGS=-isystem /usr/local/include' 'LDFLAGS= -fstack-protector-strong -Wl,-rpath=/usr/local/lib/gcc13 -L/usr/local/lib/gcc13 -L/usr/local/lib '' --=-=-= Content-Type: text/patch Content-Disposition: attachment; filename=haiku-font-double-free.diff commit 05846e17841fce3dbbb8e15fe11d38fe44b3e5e5 Author: Kyle Ambroff-Kao <kyle@HIDDEN> Date: Wed Apr 2 22:34:26 2025 -0700 Fix use-after-free bug in the Haiku font driver This fixes a bug in Emacs daemon mode on Haiku. To reproduce: 1. Start emacs with "emacs --daemon" 2. Create a new frame with "emacsclient -c" and then close it. 3. Create a new frame with "emacsclient -c" Step 3 will cause the Emacs daemon to crash. KERN: debug_server: Thread 3616 entered the debugger: Debugger call: `tried to free 0xb960bc9fd0 which points at page 232 which is not an allocation first page' The backtrace from Emacs: heap_free(void*) + 0x35 BFont_close + 0x4d haikufont_close(font*) + 0x29 (/Code/emacs/src/haikufont.c:893) sweep_vectors(void) + 0x1af (/Code/emacs/src/alloc.c:3242) garbage_collect(void) + 0x7b3 (/Code/emacs/src/alloc.c:7247) Ffuncall(ptrdiff_t, Lisp_Object*) + 0x194 (/Code/emacs/src/eval.c:3084) internal_condition_case_n(*, ptrdiff_t, Lisp_Object*, Lisp_Object, *) + 0x6c (/Code/emacs/src/eval.c:1699) safe_funcall(ptrdiff_t, Lisp_Object*) + 0x50 (/Code/emacs/src/eval.c:3114) map_keymap_canonical(Lisp_Object,map_keymap_function_t,Lisp_Object,void*) + 0x2b (/Code/emacs/src/keymap.c:608) ... It appears that the BFont has already been closed. I think that the driver is holding on to the pointer to the freed BFont (into->be_font). This patch addresses this by setting be_font to NULL so that this pointer will not be freed again. The same thing applies to info->metrics and info->glyphs, since just making this change to be_font wasn't enough to avoid crashes. With this patch I can open and close as many frames as I want without crashing. I don't totally understand the interactions here, and I see there are similar bugs in other font drivers with different workarounds. For example, in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=16069 which I found from xfont.c:xfont_close, it seems like there is an attempt to just not free the fonts when GC is invoked. I think the solution in this patch seems a little simpler, but possibly means that the fonts are initialized every time the frame count goes from 0 to 1 or more instead of just once for the life of the daemon. diff --git a/src/haikufont.c b/src/haikufont.c index 7522b92207fa..72dfcc4aa3bf 100644 --- a/src/haikufont.c +++ b/src/haikufont.c @@ -890,25 +890,45 @@ haikufont_close (struct font *font) return; block_input (); - if (info && info->be_font) - BFont_close (info->be_font); - for (i = 0; i < info->metrics_nrows; i++) + if (info) { - if (info->metrics[i]) - xfree (info->metrics[i]); + if (info->be_font) + { + BFont_close (info->be_font); + info->be_font = NULL; + } + + if (info->metrics) + { + for (i = 0; i < info->metrics_nrows; i++) + { + if (info->metrics[i]) + { + xfree (info->metrics[i]); + info->metrics[i] = NULL; + } + } + + xfree (info->metrics); + info->metrics = NULL; + } + + if (info->glyphs) + { + for (i = 0; i < 0x100; ++i) + { + if (info->glyphs[i]) + { + xfree (info->glyphs[i]); + } + } + + xfree (info->glyphs); + info->glyphs = NULL; + } } - if (info->metrics) - xfree (info->metrics); - - for (i = 0; i < 0x100; ++i) - { - if (info->glyphs[i]) - xfree (info->glyphs[i]); - } - - xfree (info->glyphs); unblock_input (); } --=-=-=--
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Kyle Ambroff-Kao <kyle@HIDDEN> Subject: bug#77478: Acknowledgement (Fixes a crash in the Haiku font driver for daemon mode) Message-ID: <handler.77478.B.174366335220164.ack <at> debbugs.gnu.org> References: <86cydtg3e5.fsf@HIDDEN> X-Gnu-PR-Message: ack 77478 X-Gnu-PR-Package: emacs X-Gnu-PR-Keywords: patch Reply-To: 77478 <at> debbugs.gnu.org Date: Thu, 03 Apr 2025 06:56:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 77478 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 77478: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D77478 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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