From debbugs-submit-bounces@debbugs.gnu.org Mon Dec 11 15:49:22 2017 Received: (at submit) by debbugs.gnu.org; 11 Dec 2017 20:49:22 +0000 Received: from localhost ([127.0.0.1]:57291 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eOV0s-0005lm-2o for submit@debbugs.gnu.org; Mon, 11 Dec 2017 15:49:22 -0500 Received: from eggs.gnu.org ([208.118.235.92]:60402) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eOUvj-0005cF-V7 for submit@debbugs.gnu.org; Mon, 11 Dec 2017 15:44:05 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eOUve-0002b8-0s for submit@debbugs.gnu.org; Mon, 11 Dec 2017 15:43:58 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=BAYES_20,T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:47329) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eOUvd-0002aV-QF for submit@debbugs.gnu.org; Mon, 11 Dec 2017 15:43:57 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51357) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eOUvc-00059M-MP for bug-grep@gnu.org; Mon, 11 Dec 2017 15:43:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eOUvX-0002NV-QF for bug-grep@gnu.org; Mon, 11 Dec 2017 15:43:56 -0500 Received: from sender-of-o51.zoho.eu ([87.252.213.248]:21003) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eOUvX-0002Ac-3Z for bug-grep@gnu.org; Mon, 11 Dec 2017 15:43:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1513025025; s=zoho; d=feusi.co; i=jeremy@feusi.co; h=Date:From:To:Subject:Message-ID:MIME-Version:Content-Type; l=41692; bh=kMbC+dkWJcaGJIHh3MuzwQJ/J1rUV4mMAplP/lpo1nI=; b=dfVO5ngJ2oTdJ2Ip38BiNuUfD4mtqcrTT4gImX1bBuQ/M3vYuTP8TWtkGjfWG7fi VsUSm7Ps3iJm97pPxZgqVzPIR77oRmMG3ETzsHQGyL0rphMumm3yR3zsHO5V//FU3kk xOMxWsz+Ubi3sp30BIOp3WfUytjeFK9ZmWTDi9FY= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=zoho; d=feusi.co; h=date:from:to:subject:message-id:mime-version:content-type:user-agent; b=GE8pKmMKoflwVx9edl8SxZ5MukOVoURnA0vYbphgvKoKR/pNxmXPowQ+xSd/qw0yH2MlegGSMxRq iTdx2co+vqD4ZeTsoSvWmqd/nMcbiTuA3fpiP2NOo9cSY7ZJ2mNQ+RAn+AHKRo2Q2Uyqvg2wL+tg EykVLM/LhetjC+S8N/I= Received: from feusi.co (194.191.224.221 [194.191.224.221]) by mx.zoho.eu with SMTPS id 151302502511631.317458219435366; Mon, 11 Dec 2017 21:43:45 +0100 (CET) Date: Mon, 11 Dec 2017 21:44:25 +0100 From: Jeremy Feusi To: bug-grep@gnu.org Subject: Segfault at changing location Message-ID: <20171211204424.GB3526@feusi.co> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="17pEHd4RhPHOinZp" Content-Disposition: inline User-Agent: Mutt/1.9.1 (2017-09-22) X-Zoho-Virus-Status: 1 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Mon, 11 Dec 2017 15:49:21 -0500 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: -4.0 (----) --17pEHd4RhPHOinZp Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi, I am working on a project for school in which I use afl to find bugs in software and I decided to fuzz grep. In doing so I discovered a segfault. When using gdb, the location of the segfault varies, which puzzles me and so I cannot include any further information. The command to obtain this bug is: grep -o -E -f where is the file attached. I am using grep 3.1 on arch linux. cheers Jeremy --17pEHd4RhPHOinZp Content-Type: application/octet-stream Content-Disposition: attachment; filename=seg-file Content-Transfer-Encoding: base64 AGR/PykpKSgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCglKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo KCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgo 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12 Dec 2017 09:47:17 -0800 (PST) In-Reply-To: <20171211204424.GB3526@feusi.co> References: <20171211204424.GB3526@feusi.co> From: Jim Meyering Date: Tue, 12 Dec 2017 09:47:17 -0800 X-Google-Sender-Auth: PqWRSpcDn-E7mxgYj3yfqHW6wKc Message-ID: Subject: Re: bug#29666: Segfault at changing location To: Jeremy Feusi Content-Type: multipart/mixed; boundary="001a1149af3e2fefbd0560283f96" X-Spam-Score: 0.5 (/) X-Debbugs-Envelope-To: 29666 Cc: 29666@debbugs.gnu.org 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: 0.5 (/) --001a1149af3e2fefbd0560283f96 Content-Type: text/plain; charset="UTF-8" On Mon, Dec 11, 2017 at 12:44 PM, Jeremy Feusi wrote: > Hi, > I am working on a project for school in which I use afl to find bugs in > software and I decided to fuzz grep. In doing so I discovered a > segfault. When using gdb, the location of the segfault varies, which > puzzles me and so I cannot include any further information. > The command to obtain this bug is: > grep -o -E -f > where is the file attached. > > I am using grep 3.1 on arch linux. > cheers > Jeremy Thank you for the report. This has been an issue since about grep-2.6.1. It gave a proper diagnostic until 2.5.4: $ grep-2.5.4/bin/grep -E -f <(printf %080000d 0|tr 0 '(') grep-2.5.4/bin/grep: Unmatched ( or \( [Exit 2] Starting in approximately 2.6.1 (I don't have 2.6.0 handy) it would fail like this: $ grep-2.6.1/bin/grep -E -f <(printf %080000d 0|tr 0 '(') Segmentation fault (core dumped) Using the latest with -P works fine: $ grep -P -f <(printf %080000d 0|tr 0 '(') grep: parentheses are too deeply nested [Exit 2] Here's a nearly-complete patch to make grep diagnose the generic "stack overflow" problem: --001a1149af3e2fefbd0560283f96 Content-Type: text/plain; charset="US-ASCII"; name="grep-stack-overflow.diff" Content-Disposition: attachment; filename="grep-stack-overflow.diff" Content-Transfer-Encoding: base64 X-Attachment-Id: f_jb3x4w6b1 RnJvbSAxNzUxYTFhYmYxZmYyNmQ1NDY3ZTUxNWM4ZGE0ZGVhNzA1M2Y3M2M4IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBKaW0gTWV5ZXJpbmcgPG1leWVyaW5nQGZiLmNvbT4KRGF0ZTog VHVlLCAxMiBEZWMgMjAxNyAwOTowNTo1NSAtMDgwMApTdWJqZWN0OiBbUEFUQ0hdIGdyZXA6IGRp YWdub3NlIHN0YWNrIG92ZXJmbG93IHJhdGhlciB0aGFuIHNlZ2ZhdWx0aW5nCgoqIGJvb3RzdHJh cC5jb25mIChnbnVsaWJfbW9kdWxlcyk6IEFkZCBjLXN0YWNrLgoqIHNyYy9ncmVwLmM6IEluY2x1 ZGUgImMtc3RhY2suaCIuCihtYWluKTogQ2FsbCBjX3N0YWNrX2FjdGlvbiAoTlVMTCk7CiogdGVz dHMvc3RhY2stb3ZlcmZsb3c6IE5ldyBmaWxlLgoqIHRlc3RzL01ha2VmaWxlLmFtIChURVNUUyk6 IEFkZCBuYW1lIG9mIG5ldyBmaWxlLgoqIE5FV1MgKEltcHJvdmVtZW50cyk6IE1lbnRpb24gaXQu ClJlcG9ydGVkIGJ5IEplcmVteSBGZXVzaSBpbiBodHRwczovL2J1Z3MuZ251Lm9yZy8yOTY2Ni4K LS0tCiBORVdTICAgICAgICAgICAgICAgICB8ICA0ICsrKysKIGJvb3RzdHJhcC5jb25mICAgICAg IHwgIDEgKwogc3JjL2dyZXAuYyAgICAgICAgICAgfCAgMiArKwogdGVzdHMvTWFrZWZpbGUuYW0g ICAgfCAgMSArCiB0ZXN0cy9zdGFjay1vdmVyZmxvdyB8IDE2ICsrKysrKysrKysrKysrKysKIDUg ZmlsZXMgY2hhbmdlZCwgMjQgaW5zZXJ0aW9ucygrKQogY3JlYXRlIG1vZGUgMTAwNzU1IHRlc3Rz L3N0YWNrLW92ZXJmbG93CgpkaWZmIC0tZ2l0IGEvTkVXUyBiL05FV1MKaW5kZXggNTFhMTUyOS4u MTZjMzZkMyAxMDA2NDQKLS0tIGEvTkVXUworKysgYi9ORVdTCkBAIC0xMyw2ICsxMywxMCBAQCBH TlUgZ3JlcCBORVdTICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgLSotIG91dGxp bmUgLSotCiAgIFRoZSAtLXJlY3Vyc2l2ZSAoLXIpIG9wdGlvbiBubyBsb25nZXIgZmFpbHMgb24g TVMtV2luZG93cy4KICAgW2J1ZyBpbnRyb2R1Y2VkIGluIGdyZXAgMi4xMV0KCisqKiBJbXByb3Zl bWVudHMKKworICBncmVwIG5vdyBkaWFnbm9zZXMgc3RhY2sgb3ZlcmZsb3cuICBCZWZvcmUsIGl0 IHdvdWxkIG9mdGVuIHNpbXBseSBzZWdmYXVsdC4KKwoKICogTm90ZXdvcnRoeSBjaGFuZ2VzIGlu IHJlbGVhc2UgMy4xICgyMDE3LTA3LTAyKSBbc3RhYmxlXQoKZGlmZiAtLWdpdCBhL2Jvb3RzdHJh cC5jb25mIGIvYm9vdHN0cmFwLmNvbmYKaW5kZXggNzNmMTU3My4uMTg1Y2QxOSAxMDA2NDQKLS0t IGEvYm9vdHN0cmFwLmNvbmYKKysrIGIvYm9vdHN0cmFwLmNvbmYKQEAgLTI3LDYgKzI3LDcgQEAg YWxsb2NhCiBhbm5vdW5jZS1nZW4KIGFyZ21hdGNoCiBjLWN0eXBlCitjLXN0YWNrCiBjbG9zZW91 dAogZGZhCiBkby1yZWxlYXNlLWNvbW1pdC1hbmQtdGFnCmRpZmYgLS1naXQgYS9zcmMvZ3JlcC5j IGIvc3JjL2dyZXAuYwppbmRleCBhZDVjZmEyLi5hNDQ0Y2YzIDEwMDY0NAotLS0gYS9zcmMvZ3Jl cC5jCisrKyBiL3NyYy9ncmVwLmMKQEAgLTMwLDYgKzMwLDcgQEAKCiAjaW5jbHVkZSAiYXJnbWF0 Y2guaCIKICNpbmNsdWRlICJjLWN0eXBlLmgiCisjaW5jbHVkZSAiYy1zdGFjay5oIgogI2luY2x1 ZGUgImNsb3Nlb3V0LmgiCiAjaW5jbHVkZSAiY29sb3JpemUuaCIKICNpbmNsdWRlICJkaWUuaCIK QEAgLTI0NTAsNiArMjQ1MSw3IEBAIG1haW4gKGludCBhcmdjLCBjaGFyICoqYXJndikKICAgaW5p dF9sb2NhbGVpbmZvICgmbG9jYWxlaW5mbyk7CgogICBhdGV4aXQgKGNsZWFuX3VwX3N0ZG91dCk7 CisgIGNfc3RhY2tfYWN0aW9uIChOVUxMKTsKCiAgIGxhc3RfcmVjdXJzaXZlID0gMDsKCmRpZmYg LS1naXQgYS90ZXN0cy9NYWtlZmlsZS5hbSBiL3Rlc3RzL01ha2VmaWxlLmFtCmluZGV4IDY2ZmI0 NjEuLjRhY2E2M2IgMTAwNjQ0Ci0tLSBhL3Rlc3RzL01ha2VmaWxlLmFtCisrKyBiL3Rlc3RzL01h a2VmaWxlLmFtCkBAIC0xNTEsNiArMTUxLDcgQEAgVEVTVFMgPQkJCQkJCVwKICAgc2tpcC1yZWFk CQkJCQlcCiAgIHNwZW5jZXIxCQkJCQlcCiAgIHNwZW5jZXIxLWxvY2FsZQkJCQlcCisgIHN0YWNr LW92ZXJmbG93CQkJCVwKICAgc3RhdHVzCQkJCQlcCiAgIHN1cnJvZ2F0ZS1wYWlyCQkJCVwKICAg c3ltbGluawkJCQkJXApkaWZmIC0tZ2l0IGEvdGVzdHMvc3RhY2stb3ZlcmZsb3cgYi90ZXN0cy9z dGFjay1vdmVyZmxvdwpuZXcgZmlsZSBtb2RlIDEwMDc1NQppbmRleCAwMDAwMDAwLi4yMDQyZWJj Ci0tLSAvZGV2L251bGwKKysrIGIvdGVzdHMvc3RhY2stb3ZlcmZsb3cKQEAgLTAsMCArMSwxNiBA QAorIyEvYmluL3NoCisjIEVuc3VyZSBhIHN0YWNrIG92ZXJmbG93IG5vIGxvbmdlciBzZWdmYXVs dHMKKworLiAiJHtzcmNkaXI9Ln0vaW5pdC5zaCI7IHBhdGhfcHJlcGVuZF8gLi4vc3JjCisKKyMg VG9vIG1hbnkgb3BlbiBwYXJlbnRoZXNlcy4KK3ByaW50ZiAlMDgwMDAwZCAwfHRyIDAgJygnID4g aW4gfHwgZnJhbWV3b3JrX2ZhaWx1cmVfCitlY2hvIGdyZXA6IHN0YWNrIG92ZXJmbG93ID4gZXhw IHx8IGZyYW1ld29ya19mYWlsdXJlXworCitmYWlsPTAKK3JldHVybnNfIDIgZ3JlcCAtRSAtZiBp biA+b3V0IDI+ZXJyIHx8IGZhaWw9MQorCitjb21wYXJlIC9kZXYvbnVsbCBvdXQgfHwgZmFpbD0x Citjb21wYXJlIGV4cCBlcnIgfHwgZmFpbD0xCisKK0V4aXQgJGZhaWwKLS0gCjIuMTQuMS43Mjku ZzU5YzBlYTE4MwoK --001a1149af3e2fefbd0560283f96-- From debbugs-submit-bounces@debbugs.gnu.org Sat Dec 16 14:44:14 2017 Received: (at 29666-done) by debbugs.gnu.org; 16 Dec 2017 19:44:14 +0000 Received: from localhost ([127.0.0.1]:37671 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eQINX-0001EW-5N for submit@debbugs.gnu.org; Sat, 16 Dec 2017 14:44:14 -0500 Received: from mail-qt0-f171.google.com ([209.85.216.171]:36070) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eQINV-0001Dz-S5 for 29666-done@debbugs.gnu.org; Sat, 16 Dec 2017 14:44:10 -0500 Received: by mail-qt0-f171.google.com with SMTP id a16so15919079qtj.3 for <29666-done@debbugs.gnu.org>; Sat, 16 Dec 2017 11:44:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=xOVoJhZxGMn5RBXenkEjJBorvXXxDCOPgHX5G297jcI=; b=AbLmaj4OGKI7GkjymEqx7tzoQ5orowe3cwSS9zrq4inoq8jdxwPFXDzwQEcb0bLNjy gcDLrB/OxjPvn//HkvcBW6dUOkY/wVGMz+GXRfDutwVoxFGLt89VNM6qnZ15Doab/had RNDNgZrVtxdn2bqDFBbv2Y6Aofel0PrBNN6OaoLf8I7KoOwsWtCWcyCHq62R16Km9OgH tjMq+QPihTFLuWxApfG/cUvElZHfNCCXB4frh/tY7J9FBmKniLyFz+cCXM2/DVu0pcLQ b079y5x0RjLGxJaz7GloOJJ2pEivCQVtiOXJ73F40z8UUK2Rfe3B9mN01IJ9hGVNhVYY iang== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=xOVoJhZxGMn5RBXenkEjJBorvXXxDCOPgHX5G297jcI=; b=P2ol0mwrB3Tlo18mhXuA4SpruHUsuL9fjQNFd2odMNAua+vo3lmwdOybm4NbxHjI8Y 1eLOOnG8Pz4S9DcUpX/bVpch54d1Ki/+iwoig4qg32QS6Bh+Hz5oUEPn1OTmFr0xu2h2 Bx7GkfG/uoIgX+ye9v/dQ8gYzg8FdqgryCw7N1lY4C19B65wppfOBv3I9iazSWz2bers qawU1tYVXJC3HRl259t9CLAB3fwTx4YrOKJDzQ5PJN9caVsNhwyohqQ5fXPDh+1T+0zy oZlpK5RiuSfUJfmGyxZLT5MjRe9pGI2R3h/A/W5dkdAigDlRtBRnRUPj8evZMFj6s1PK iQ+w== X-Gm-Message-State: AKGB3mLpYfiKIIJma6Qd+sBy7GA+ou++5oW+WKTfT2MAuTrLnr/3UA3b uDMXn7wSBeui9if/6fT290/Q77l50gWBzXf1amo= X-Google-Smtp-Source: ACJfBoulcz2ZjNT6YLPTQp5ca06rsyJJXFYLZ0EZB6qWj7RbdStN2w0bOOQtzSZf9YJidIo370+ZLdylWbSqU7hipss= X-Received: by 10.200.40.54 with SMTP id 51mr28992291qtq.339.1513453444239; Sat, 16 Dec 2017 11:44:04 -0800 (PST) MIME-Version: 1.0 Received: by 10.55.9.17 with HTTP; Sat, 16 Dec 2017 11:43:43 -0800 (PST) In-Reply-To: References: <20171211204424.GB3526@feusi.co> From: Jim Meyering Date: Sat, 16 Dec 2017 11:43:43 -0800 X-Google-Sender-Auth: DxkzZm5HSFfMwU1-5ZT6W40sQX0 Message-ID: Subject: Re: bug#29666: Segfault at changing location To: Jeremy Feusi Content-Type: text/plain; charset="UTF-8" X-Spam-Score: 0.5 (/) X-Debbugs-Envelope-To: 29666-done Cc: 29666-done@debbugs.gnu.org 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: 0.5 (/) On Tue, Dec 12, 2017 at 9:47 AM, Jim Meyering wrote: > On Mon, Dec 11, 2017 at 12:44 PM, Jeremy Feusi wrote: ... > Thank you for the report. > > This has been an issue since about grep-2.6.1. > It gave a proper diagnostic until 2.5.4: > > $ grep-2.5.4/bin/grep -E -f <(printf %080000d 0|tr 0 '(') > grep-2.5.4/bin/grep: Unmatched ( or \( > [Exit 2] > > Starting in approximately 2.6.1 (I don't have 2.6.0 handy) it > would fail like this: > > $ grep-2.6.1/bin/grep -E -f <(printf %080000d 0|tr 0 '(') > Segmentation fault (core dumped) > > Using the latest with -P works fine: > > $ grep -P -f <(printf %080000d 0|tr 0 '(') > grep: parentheses are too deeply nested > [Exit 2] > > Here's a nearly-complete patch to make grep diagnose the generic > "stack overflow" problem: I found the root cause and filed a glibc bug for that (link below). Here are the updated commit log and NEWS entry: grep: diagnose stack overflow rather than segfaulting * bootstrap.conf (gnulib_modules): Add c-stack. * src/grep.c: Include "c-stack.h". (main): Call c_stack_action (NULL); * tests/stack-overflow: New file. * tests/Makefile.am (TESTS): Add name of new file. * NEWS (Improvements): Mention it. Interestingly, this bug does not afflict grep-2.5.4 or prior, so it appeared to have been introduced with grep-2.6. However, the origin is in glibc's regexp compiler, and I tracked it to stack-aware parsing that was removed from glibc's regexp in 2002. However, grep-2.5.4 was released in 2009. That version worked (and still works, now) because it included and (by default) used an old copy of glibc's regexp code. Jeremy Feusi reported the grep segfault in https://bugs.gnu.org/29666. I reported the glibc regexp bug in https://sourceware.org/bugzilla/show_bug.cgi?id=22620 ** Improvements grep now diagnoses stack overflow. Before grep-2.6, the included regexp code would detect it. Since 2.6, grep defaulted to using glibc's regexp, which lost that capability. Here's the pushed commit: https://git.savannah.gnu.org/cgit/grep.git/commit/?id=51ef8adb2f7eeb073ba98be4f6baf56817e4d358 From debbugs-submit-bounces@debbugs.gnu.org Sun Dec 17 11:33:45 2017 Received: (at 29666) by debbugs.gnu.org; 17 Dec 2017 16:33:45 +0000 Received: from localhost ([127.0.0.1]:39264 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eQbsn-0007cG-GI for submit@debbugs.gnu.org; Sun, 17 Dec 2017 11:33:45 -0500 Received: from mail-pl0-f45.google.com ([209.85.160.45]:45715) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eQbsl-0007c2-7A for 29666@debbugs.gnu.org; Sun, 17 Dec 2017 11:33:43 -0500 Received: by mail-pl0-f45.google.com with SMTP id o2so3353386plk.12 for <29666@debbugs.gnu.org>; Sun, 17 Dec 2017 08:33:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:mime-version; bh=mSVKxvFz9lUBPhNMyZhRDiIvIO2U+pjTJcFoj1HKnWk=; b=ElUo+auwwB4Nn81iDTvuFuzzkEgbR71ZFBXjnVvGa2d2d/xdKY+OIOBWhei1uPW2dV tgTMmAK7PFMcLRmzjNkWsIxXtPGbaK6BUmM8qxevWnMmC6dTsJYro5qeWuLYgb0HXEKk ctyyPqFHsLQPzGI/Fk0bvhvc5OaokUuVyqT3yJr8qOGzMu2H4egYyZ1hoqDwL9s8PSxr HS+WUzjJ1/J/G/SEi1qLrsNpb02YTQEo2mv/Eg+51Cafjp+8AkabofP/cFxgku7OvHY/ HPiLhP27Op0Lj5t518lvP5URUwRxYgpCXn+L3eczt6Xg1hEDH28kB/24e6at9cmCwRfc Xf2g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version; bh=mSVKxvFz9lUBPhNMyZhRDiIvIO2U+pjTJcFoj1HKnWk=; b=NXS/FPg2Fov7FfZ1GjNo5aXT/27AF10z1hCSMDs+hyGqm4pdQfF2OgUQv5pwuJpwNc DgU5n72u74IqWYMkQZu6LYIa6mBCEIujofiiILFK1ZHbeFS87H3A/xpcJbA7bYObvjxl afvR73kLCzL2IakFwAa8JROWfcBMt0DJQLI6AmPJmkl/Mjfr5oD8HUmDqzyaGA/qDZbM znKjATTvp+T30/yDe83XoLZqd3LxqB83IVqLOAyMsi3Zf8H14GpD3jALFrSQ+gY7r9Gz GDhK7Nn/U8+YTeJZbESgDG5T1oHp1XS/rBdhncdq442Do1VSaT7g4A7koR4oVUdY0uv8 nDVA== X-Gm-Message-State: AKGB3mJ4VjOISm0HJX118ITSVyq2woLhqvVUgLlQN7NsM3Y6wtAX3YmT b/dbwezqW2pLb/WJGwVsmBgSfg== X-Google-Smtp-Source: ACJfBoscZJChMmL5eQ8yeZ9rSk7ON8hIwwQW0Bxd/tF16ggKORxRxbX3hietoOAIzpzaPe9dCSmjNw== X-Received: by 10.159.205.139 with SMTP id v11mr20128773plo.233.1513528417045; Sun, 17 Dec 2017 08:33:37 -0800 (PST) Received: from jm.local ([2620:10d:c090:180::5ebe]) by smtp.gmail.com with ESMTPSA id l21sm21223049pfg.156.2017.12.17.08.33.35 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 17 Dec 2017 08:33:35 -0800 (PST) From: Jim Meyering To: grep-devel@gnu.org Subject: patch-FYI: fix link failure and suppress a warning Date: Sun, 17 Dec 2017 08:33:28 -0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.5 (/) X-Debbugs-Envelope-To: 29666 Cc: 29666@debbugs.gnu.org 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: 0.5 (/) Here are two patches. The first suppresses a warning I saw when building with gcc-8.0.0 20171215 on fedora 27. The second fixes a link failure reported by Jeremy Feusi. Subject: [PATCH 1/2] build: suppress sig-handler.h's -Wcast-function-type warning * configure.ac (WERROR_CFLAGS): Add -Wno-cast-function-type to suppress warning about sig-handler.h's sa_handler_t cast: sig-handler.h: In function 'get_handler': sig-handler.h:47:12: error: cast between incompatible function\ types from 'void (* const)(int, siginfo_t *, void *)'\ {aka 'void (* const)(int, struct *, void *)'}\ to 'void (*)(int)' [-Werror=cast-function-type] return (sa_handler_t) a->sa_sigaction; --- configure.ac | 1 + 1 file changed, 1 insertion(+) diff --git a/configure.ac b/configure.ac index 032c91b..59153dc 100644 --- a/configure.ac +++ b/configure.ac @@ -149,6 +149,7 @@ if test "$gl_gcc_warnings" = yes; then gl_WARN_ADD([-Wno-missing-field-initializers]) # We need this one gl_WARN_ADD([-Wno-sign-compare]) # Too many warnings for now gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now + gl_WARN_ADD([-Wno-cast-function-type]) # sig-handler.h's sa_handler_t cast # In spite of excluding -Wlogical-op above, it is enabled, as of # gcc 4.5.0 20090517, and it provokes warnings in cat.c, dd.c, truncate.c -- Subject: [PATCH 2/2] build: link with -lsigsegv, when c-stack module requires it * src/Makefile.am (grep_LDADD): Add $(LIBCSTACK). Otherwise, on at least Debian and Arch-based systems, linking would fail with diagnostics like these: c-stack.c:207: undefined reference to `stackoverflow_install_handler' c-stack.c:216: undefined reference to `sigsegv_install_handler' Reported by Jeremy Feusi. --- src/Makefile.am | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/Makefile.am b/src/Makefile.am index 71c64f9..7a0cdef 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -43,7 +43,7 @@ LDADD = \ ../lib/libgreputils.a $(LIBINTL) ../lib/libgreputils.a $(LIBICONV) \ $(LIBTHREAD) -grep_LDADD = $(LDADD) $(PCRE_LIBS) +grep_LDADD = $(LDADD) $(PCRE_LIBS) $(LIBCSTACK) localedir = $(datadir)/locale AM_CPPFLAGS = -I$(top_builddir)/lib -I$(top_srcdir)/lib -- From unknown Tue Aug 19 21:02:15 2025 Received: (at fakecontrol) by fakecontrolmessage; To: internal_control@debbugs.gnu.org From: Debbugs Internal Request Subject: Internal Control Message-Id: bug archived. Date: Mon, 15 Jan 2018 12:24:07 +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