From unknown Mon Aug 18 14:16:02 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#16427 <16427@debbugs.gnu.org> To: bug#16427 <16427@debbugs.gnu.org> Subject: Status: unexec doesn't work with GCC AddressSanitizer Reply-To: bug#16427 <16427@debbugs.gnu.org> Date: Mon, 18 Aug 2025 21:16:02 +0000 retitle 16427 unexec doesn't work with GCC AddressSanitizer reassign 16427 emacs submitter 16427 Paul Eggert severity 16427 important thanks From debbugs-submit-bounces@debbugs.gnu.org Sun Jan 12 18:26:30 2014 Received: (at submit) by debbugs.gnu.org; 12 Jan 2014 23:26:30 +0000 Received: from localhost ([127.0.0.1]:48158 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1W2UQH-0002yZ-J8 for submit@debbugs.gnu.org; Sun, 12 Jan 2014 18:26:30 -0500 Received: from eggs.gnu.org ([208.118.235.92]:48330) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1W2UQD-0002yP-FE for submit@debbugs.gnu.org; Sun, 12 Jan 2014 18:26:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1W2UQ6-0004kc-G7 for submit@debbugs.gnu.org; Sun, 12 Jan 2014 18:26:25 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:37135) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W2UQ6-0004kM-Cf for submit@debbugs.gnu.org; Sun, 12 Jan 2014 18:26:18 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50047) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W2UQ0-0003Bn-FJ for bug-gnu-emacs@gnu.org; Sun, 12 Jan 2014 18:26:18 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1W2UPt-0004Yx-1t for bug-gnu-emacs@gnu.org; Sun, 12 Jan 2014 18:26:12 -0500 Received: from smtp.cs.ucla.edu ([131.179.128.62]:56551) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W2UPs-0004Yp-OQ for bug-gnu-emacs@gnu.org; Sun, 12 Jan 2014 18:26:04 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id 4871739E8011 for ; Sun, 12 Jan 2014 15:26:03 -0800 (PST) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FiKq96Oy1zGn for ; Sun, 12 Jan 2014 15:26:02 -0800 (PST) Received: from [192.168.1.9] (pool-108-0-233-62.lsanca.fios.verizon.net [108.0.233.62]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 6792E39E8008 for ; Sun, 12 Jan 2014 15:26:02 -0800 (PST) Message-ID: <52D32489.5010702@cs.ucla.edu> Date: Sun, 12 Jan 2014 15:26:01 -0800 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Emacs bug reports Subject: unexec doesn't work with GCC AddressSanitizer Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -4.0 (----) It'd be better for debugging if Emacs worked with the AddressSanitizer of recent GCC implementations, but unfortunately there are problems. On Fedora 20 x86-64, if I configure GNU Emacs using: ./configure CFLAGS='-g3 -O0 -fsanitize=address' the resulting build fails during unexec, with symptoms like those shone at the end of this message. 'unexec' is crashing here: memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, NEW_SECTION_H (nn).sh_size); presumably because SRC contains holes that have been sanitized. This problem has been noted on emacs-devel in the past: http://lists.gnu.org/archive/html/emacs-devel/2012-06/msg00600.html http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg01046.html but it's never gotten a formal bug report so I thought I'd file one. Here are the symptoms: if test "no" = "yes"; then \ rm -f bootstrap-emacs; \ ln temacs bootstrap-emacs; \ else \ ./temacs --batch --load loadup bootstrap || exit 1; \ test "X" = X || -zex emacs; \ mv -f emacs bootstrap-emacs; \ fi Loading loadup.el (source)... ... Finding pointers to doc strings... Finding pointers to doc strings...done Dumping under the name emacs ================================================================= ==30803== ERROR: AddressSanitizer: unknown-crash on address 0x000000c4c240 at pc 0x7ffff4e5bc2f bp 0x7fffffffc8a0 sp 0x7fffffffc048 READ of size 3342120 at 0x000000c4c240 thread T0 #0 0x7ffff4e5bc2e (/usr/lib64/libasan.so.0.0.0+0xec2e) #1 0x886d9b (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x886d9b) #2 0x6e9b7b (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x6e9b7b) #3 0x8092c8 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x8092c8) #4 0x802486 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x802486) #5 0x808c65 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x808c65) #6 0x8021fb (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x8021fb) #7 0x808c65 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x808c65) #8 0x854caf (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x854caf) #9 0x852b0a (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x852b0a) #10 0x80957f (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x80957f) #11 0x808345 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x808345) #12 0x6eca50 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x6eca50) #13 0x805e18 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x805e18) #14 0x6ecaac (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x6ecaac) #15 0x804aa9 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x804aa9) #16 0x6ec97d (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x6ec97d) #17 0x6eba41 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x6eba41) #18 0x6ebc24 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x6ebc24) #19 0x6e819c (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x6e819c) #20 0x7fffed8e3d64 (/usr/lib64/libc-2.18.so+0x21d64) #21 0x417518 (/home/eggert/src/gnu/emacs/static-checking/src/temacs+0x417518) 0x000000c4c240 is located 32 bytes to the left of global variable 'Sredraw_frame (dispnew.c)' (0xc4c260) of size 48 Shadow bytes around the buggy address: 0x0000801817f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x000080181800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x000080181810: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x000080181820: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x000080181830: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x000080181840: 00 00 00 00 00 00 00 00[00]00 00 00 00 00 00 00 0x000080181850: 00 00 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 f9 f9 0x000080181860: f9 f9 f9 f9 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 0x000080181870: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 00 00 00 00 0x000080181880: 00 00 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 f9 f9 0x000080181890: f9 f9 f9 f9 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap righ redzone: fb Freed Heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 ASan internal: fe ==30803== ABORTING Makefile:814: recipe for target 'bootstrap-emacs' failed make[1]: *** [bootstrap-emacs] Error 1 make[1]: Leaving directory '/home/eggert/src/gnu/emacs/static-checking/src' Makefile:377: recipe for target 'src' failed make: *** [src] Error 2 Compilation exited abnormally with code 2 at Sun Jan 12 15:01:53 From debbugs-submit-bounces@debbugs.gnu.org Mon Jan 13 12:30:05 2014 Received: (at 16427) by debbugs.gnu.org; 13 Jan 2014 17:30:05 +0000 Received: from localhost ([127.0.0.1]:49319 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1W2lKu-0003jB-Bl for submit@debbugs.gnu.org; Mon, 13 Jan 2014 12:30:04 -0500 Received: from fencepost.gnu.org ([208.118.235.10]:35437) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1W2lKq-0003iJ-PL for 16427@debbugs.gnu.org; Mon, 13 Jan 2014 12:30:01 -0500 Received: from rgm by fencepost.gnu.org with local (Exim 4.71) (envelope-from ) id 1W2lKp-0000Z7-J1; Mon, 13 Jan 2014 12:29:59 -0500 From: Glenn Morris To: 16427@debbugs.gnu.org Subject: Re: bug#16427: unexec doesn't work with GCC AddressSanitizer References: <52D32489.5010702@cs.ucla.edu> X-Spook: gamma Perl-RSA IMF Zachawi Noriega AMW bootleg security X-Ran: /lx<#N8S)~8bGAlKI=7\`dYSfy];{n"eSk[%T5"p;fI}^0)*wH>p6#n~_$hOo(SU'!J9vv X-Hue: black X-Attribution: GM Date: Mon, 13 Jan 2014 12:29:59 -0500 In-Reply-To: <52D32489.5010702@cs.ucla.edu> (Paul Eggert's message of "Sun, 12 Jan 2014 15:26:01 -0800") Message-ID: User-Agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Spam-Score: -5.1 (-----) X-Debbugs-Envelope-To: 16427 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.1 (-----) I classed this as "important" because it seems to me to be something that's, err, important, to fix at some point; but I don't know if it's important enough for 24.4. From debbugs-submit-bounces@debbugs.gnu.org Wed Oct 29 11:55:49 2014 Received: (at control) by debbugs.gnu.org; 29 Oct 2014 15:55:49 +0000 Received: from localhost ([127.0.0.1]:38940 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XjVbB-0003wM-KO for submit@debbugs.gnu.org; Wed, 29 Oct 2014 11:55:49 -0400 Received: from fencepost.gnu.org ([208.118.235.10]:45621 ident=Debian-exim) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XjVb9-0003wA-Jp for control@debbugs.gnu.org; Wed, 29 Oct 2014 11:55:48 -0400 Received: from rgm by fencepost.gnu.org with local (Exim 4.71) (envelope-from ) id 1XjVb8-0001TC-VB for control@debbugs.gnu.org; Wed, 29 Oct 2014 11:55:47 -0400 Date: Wed, 29 Oct 2014 11:55:46 -0400 Message-Id: Subject: control message for bug 18885 To: X-Mailer: mail (GNU Mailutils 2.1) From: Glenn Morris X-Spam-Score: -5.6 (-----) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.6 (-----) forcemerge 16427 18885 From debbugs-submit-bounces@debbugs.gnu.org Tue Jun 18 19:48:13 2019 Received: (at 16427-done) by debbugs.gnu.org; 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Tue, 18 Jun 2019 16:48:01 -0700 (PDT) Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id E39A0161A75 for <16427-done@debbugs.gnu.org>; Tue, 18 Jun 2019 16:48:01 -0700 (PDT) To: 16427-done@debbugs.gnu.org From: Paul Eggert Subject: Re: unexec doesn't work with GCC AddressSanitizer Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECHgECF4AACgkQ7ZfpDmKqfjRRGw/+Ij03dhYfYl/gXVRiuzV1gGrbHk+t nfrI/C7fAeoFzQ5tVgVinShaPkZo0HTPf18x6IDEdAiO8Mqo1yp0CtHmzGMCJ50o4Grgfjlr 6g/+vtEOKbhleszN2XpJvpwM2QgGvn/laTLUu8PH9aRWTs7qJJZKKKAb4sxYc92FehPu6FOD 0dDiyhlDAq4lOV2mdBpzQbiojoZzQLMQwjpgCTK2572eK9EOEQySUThXrSIz6ASenp4NYTFH s9tuJQvXk9gZDdPSl3bp+47dGxlxEWLpBIM7zIONw4ks4azgT8nvDZxA5IZHtvqBlJLBObYY 0Le61Wp0y3TlBDh2qdK8eYL426W4scEMSuig5gb8OAtQiBW6k2sGUxxeiv8ovWu8YAZgKJfu oWI+uRnMEddruY8JsoM54KaKvZikkKs2bg1ndtLVzHpJ6qFZC7QVjeHUh6/BmgvdjWPZYFTt N+KA9CWX3GQKKgN3uu988yznD7LnB98T4EUH1HA/GnfBqMV1gpzTvPc4qVQinCmIkEFp83zl +G5fCjJJ3W7ivzCnYo4KhKLpFUm97okTKR2LW3xZzEW4cLSWO387MTK3CzDOx5qe6s4a91Zu ZM/j/TQdTLDaqNn83kA4Hq48UHXYxcIh+Nd8k/3w6lFuoK0wrOFiywjLx+0ur5jmmbecBGHc 1xdhAFHOwU0ETIByZAEQAKaF678T9wyH4wjTrV1Pz3cDEoSnV/0ZUrOT37p1dcGyj/IXq1x6 70HRVahAmk0sZpYc25PF9D5GPYHFWlNjuPU96rDndXB3hedmBRhLdC4bAXjI4DV+bmdVe+q/ IMnlZRaVlm9EiMCVAR6w13sReu7qXkW9r3RwY2AzXskp/tAe4BRKr1Zmbvi2nbnQ6epEC42r Rbx0B1EhjbIQZ5JHGk24iPT7LdBgnNmos5wYjzwNlkMQD5T0Ydzhk7J+UxwA5m46mOhRDC2r FV/A0gm5TLy8DXjv/Esc4gYnYai6SQqnUEVh5LuV8YCJBnijs+Tiw71x1icmn6xGI45EugJO gec+rLypYgpVp4x0HI5T88qBRYCkxH3Kg8Qo+EWNA9A4LRQ9DX8njona0gf0s03tocK8kBN6 6UoqqPtHBnc4eMgBymCflK12eKfd2YYxnyg9cZazWA5VslvTxpm76hbg5oiAEH/Vg/8MxHyA nPhfrgwyPrmJEcVBafdspJnYQxBYNco2LFPIhlOvWh8r4at+s+M3Lb26oUTczlgdW1Sf3SDA 77BMRnF0FQyE+7AzV79MBN4ykiqaezQxtaF1Fy/tvkhffSo8u+dwG0EgJh+te38gTcISVr0G IPplLz6YhjrbHrPRF1CN5UuL9DBGjxuN35RLNVEfta6RUFlR6NctTjvrABEBAAHCwWUEGAEC AA8FAkyAcmQCGwwFCRLMAwAACgkQ7ZfpDmKqfjSrHA/+KzAKvTxRhA9MWNLxIyJ7S5uJ16gs T3oCjZrBKGEhKMOGX4O0GA6VOEryO7QRCCYah3oxSG38IAnNeiwJXgU9Bzkk85UGbPEd7HGF /VSeHCQwWou6jqUDTSDvn9YhNTdG0KXPM74aC+xr2Zow1O2mhXihgWKD0Dw+0LYPnUOsQ0KO FxHXXYHmRrS1OZPU59BLvc+TRhIhafSHKLwbXK+6ckkxBx6h8z5ccpG0Qs4bFhdFYnFrEieD LoGmnE2YLhdV6swJ9VNCS6pLiEohT3fm7aXm15tZOIyzMZhHRSAPblXxQ0ZSWjq8oRrcYNFx c4W1URpAkBCOYJoXvQfD5L3lqAl8TCqDUzYxhH/tJhbDdHrqHH767jaDaTB1+Talp/2AMKwc XNOdiklGxbmHVG6YGl6g8Lrbsu9NZEI4yLlHzuikthJWgz+3vZhVGyNlt+HNIoF6CjDL2omu 5cEq4RDHM44QqPk6l7O0pUvN1mT4B+S1b08RKpqm/ff015E37HNV/piIvJlxGAYz8PSfuGCB 1thMYqlmgdhd9/BabGFbGGYHA6U4/T5zqU+f6xHy1SsAQZ1MSKlLwekBIT+4/cLRGqCHjnV0 q5H/T6a7t5mPkbzSrOLSo4puj+IToNjYyYIDBWzhlA19avOa+rvUjmHtD3sFN7cXWtkGoi8b uNcby4U= Organization: UCLA Computer Science Department Message-ID: Date: Tue, 18 Jun 2019 16:48:01 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 16427-done X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -3.3 (---) Closing this old bug as the portable dumper does work with AddressSanitizer. From unknown Mon Aug 18 14:16:02 2025 Received: (at fakecontrol) by fakecontrolmessage; To: internal_control@debbugs.gnu.org From: Debbugs Internal Request Subject: Internal Control Message-Id: bug archived. Date: Wed, 17 Jul 2019 11:24:05 +0000 User-Agent: Fakemail v42.6.9 # This is a fake control message. # # The action: # bug archived. thanks # This fakemail brought to you by your local debbugs # administrator