Re: Segfault on recursive trap/kill

Path	csiph.com!3.us.feeder.erje.net!feeder.erje.net!news.snarked.org!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail
From	Chet Ramey <chet.ramey@case.edu>
Newsgroups	gnu.bash.bug
Subject	Re: Segfault on recursive trap/kill
Date	Sat, 6 Oct 2018 12:33:22 -0400
Organization	ITS, Case Western Reserve University
Lines	22
Approved	bug-bash@gnu.org
Message-ID	<mailman.1763.1538843614.1284.bug-bash@gnu.org> (permalink)
References	<8736tj3llu.fsf@gnu.org>
Reply-To	chet.ramey@case.edu
NNTP-Posting-Host	lists.gnu.org
Mime-Version	1.0
Content-Type	text/plain; charset=utf-8
Content-Transfer-Encoding	8bit
X-Trace	usenet.stanford.edu 1538843614 18775 208.118.235.17 (6 Oct 2018 16:33:34 GMT)
X-Complaints-To	action@cs.stanford.edu
Cc	chet.ramey@case.edu
To	Mike Gerwitz <mtg@gnu.org>, bug-bash@gnu.org
Envelope-to	bug-bash@gnu.org
X-Google-DKIM-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:cc:subject:to:references:from:openpgp :autocrypt:organization:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=O8TGwwSOiZKKCELFIzDL8e2a17GdsJY3t5uf6KIrf5I=; b=WVwcu/kGyYUabuwykqjpTR5mRIx1Ldso/R6d+DF94t28UsiBAdR+FnKPZBHo9vywZF 6jLq0/JLT2626QobbVBYB/Ug6YSdc7nRCIM6hhsKyBo9FO+d9tJBwa7LMeY6zsjkFZ6E 8Y7v8muxIn4t39AFVHzd8ieAnMK3hUwHkvXQa9ZVYREnGSf6Xqu9jCe244gEp3bF726L 6b3ufT8ra4mqGneOXKSwJtsEdbjJKptuKvk8fxn227ljnVQHcx4FDoE1dsQEQibOfgk7 bIWXbnbMST3qLBAghn7h/iou8qVrLh6xqvKejz9l8s9GpwkDX0dAxmSalEkrkLWEUAh8 LvxQ==
X-Gm-Message-State	ABuFfojZ2z5yA5my3TxG0lVDgvd6yO/PpGNPDh8tTkplK7NmS/hkUBd3 wjUEirtmww9GLQjXWn7/0txkn3cD+Mc/gHhfXsib9VMYJpWrlcNw3R2W3SG0PbPgmPGYyc4D/sL dwScbQi4MBoc=
X-Received	by 2002:a24:aa41:: with SMTP id y1-v6mr12077872iti.91.1538843605331; Sat, 06 Oct 2018 09:33:25 -0700 (PDT)
X-Google-Smtp-Source	ACcGV63Z2XFuPKer7xxgPCj1K/b+JVyXlqjGNJuKP21Apbwxyv0/hF9PaKDcg1cGnab7oKnuWU/YfA==
X-Received	by 2002:a24:aa41:: with SMTP id y1-v6mr12077854iti.91.1538843605075; Sat, 06 Oct 2018 09:33:25 -0700 (PDT)
Openpgp	preference=signencrypt
Autocrypt	addr=chet.ramey@case.edu; prefer-encrypt=mutual; keydata= xsDiBEEOsGwRBACFa0A1oa71HSZLWxAx0svXzhOZNQZOzqHmSuGOG92jIpQpr8DpvgRh40Yp AwdcXb8QG1J5yGAKeevNE1zCFaA725vGSdHUyypHouV0xoWwukYO6qlyyX+2BZU+okBUqoWQ koWxiYaCSfzB2Ln7pmdys1fJhcgBKf3VjWCjd2XJTwCgoFJOwyBFJdugjfwjSoRSwDOIMf0D /iQKqlWhIO1LGpMrGX0il0/x4zj0NAcSwAk7LaPZbN4UPjn5pqGEHBlf1+xDDQCkAoZ/VqES GZragl4VqJfxBr29Ag0UDvNbUbXoxQsARdero1M8GiAIRc50hj7HXFoERwenbNDJL86GPLAQ OTGOCa4W2o29nFfFjQrsrrYHzVtyA/9oyKvTeEMJ7NA3VJdWcmn7gOu0FxEmSNhSoV1T4vP2 1Wf7f5niCCRKQLNyUy0wEApQi4tSysdz+AbgAc0b/bHYVzIf2uO2lIEZQNNt+3g2bmXgloWm W5fsm/di50Gm1l1Na63d3RZ00SeFQos6WEwLUHEB0yp6KXluXLLIZitEJM0aQ2hldCBSYW1l eSA8Y2hldEBjd3J1LmVkdT7CYQQTEQIAIQIbAwYLCQgHAwIDFQIDAxYCAQIeAQIXgAUCQ+La kQIZAQAKCRC7WGnwZOp0q9rGAJ4sRGLmlF8klZTH75z7jyQScpU6aACeNMahjWIhumt4u96d 9mdMJqlabVnOwE0EQQ6wbxAEAJCukwDigRDPhAuI+lf+6P64lWanIFOXIndqhvU13cDbQ/Wt 5LwPzm2QTvd7F+fcHOgZ8KOFScbDpjJaRqwIybMTcIN0B2pBLX/C10W1aY+cUrXZgXUGVISE MmpaP9v02auToo7XXVEHC+XLO9IU7/xaU98FL69l6/K4xeNSBRM/AAMHA/wNAmRBpcyK0+Vg gZ5esQaIP/LyolAm2qwcmrd3dZi+g24s7yjV0EUwvRP7xHRDQFgkAo6++QbuecU/J90lxrVn QwucZmfz9zgWDkT/MpfB/CNRSKLFjhYq2yHmHWT6vEjw9Ry/hF6Pc0oh1a62USdfaKAiim0n VxxQmPmiRvtCmcJJBBgRAgAJBQJBDrBvAhsMAAoJELtYafBk6nSr43AAn2ZZFQg8Gs/zUzvX Mt7evaFqVTzcAJ0cHtKpP1i/4H4R9+OsYeQdxxWxTQ==
User-Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1
In-Reply-To	<8736tj3llu.fsf@gnu.org>
Content-Language	en-US
X-Junkmail-Premium-Raw	score=7/90, refid=2.7.2:2018.10.5.210616:17:7.944, ip=, rules=__YOUTUBE_RCVD, __X_GOOGLE_DKIM_SIGNATURE, __HAS_REPLYTO, __HAS_CC_HDR, __SUBJ_REPLY, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __TO_MALFORMED_2, __TO_NAME, __TO_NAME_DIFF_FROM_ACC, __REFERENCES, __HAS_FROM, FROM_EDU_TLD, __HAS_MSGID, __SANE_MSGID, DATE_TZ_NA, __USER_AGENT, __MOZILLA_USER_AGENT, __MIME_VERSION, __IN_REP_TO, __CT, __CT_TEXT_PLAIN, __CTE, __REPLYTO_SAMEAS_FROM_ADDY, __REPLYTO_SAMEAS_FROM_ACC, __FROM_DOMAIN_IN_ANY_CC1, __FROM_DOMAIN_IN_ANY_CC2, __REPLYTO_SAMEAS_FROM_DOMAIN, __ANY_URI, __URI_WITH_PATH, __URI_NO_WWW, __CP_URI_IN_BODY, __FRAUD_MONEY_CURRENCY_DOLLAR, __SUBJ_ALPHA_NEGATE, __URI_IN_BODY, __URI_NOT_IMG, __FORWARDED_MSG, __NO_HTML_TAG_RAW, BODYTEXTP_SIZE_3000_LESS, BODY_SIZE_800_899, __MIME_TEXT_P1, __MIME_TEXT_ONLY, __URI_NS, HTML_00_01, HTML_00_10, __FRAUD_MONEY_CURRENCY, BODY_SIZE_5000_LESS, IN_REP_TO, MSG_THREAD, [TRUNCATED]
X-Junkmail-Status	score=10/90, host=mpv2-2015.case.edu
X-Junkmail-Signature-Raw	score=unknown, refid=str=0001.0A020202.5BB8E3D5.0058,ss=1,re=0.000,fgs=0, ip=174.131.57.47, so=2016-11-06 16:00:04, dmn=2011-05-27 18:58:46, mode=multiengine
X-Junkmail-IWF	false
X-Mirapoint-Virus-RAPID-Raw	score=unknown(0), refid=str=0001.0A020202.5BB8E3D5.0058,ss=1,re=0.000,fgs=0, ip=174.131.57.47, so=2016-11-06 16:00:04, dmn=2011-05-27 18:58:46
X-Mirapoint-Loop-Id	da4cc3ca0857767c697bd36ffd646682
X-detected-operating-system	by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic]
X-Received-From	129.22.103.227
X-BeenThere	bug-bash@gnu.org
X-Mailman-Version	2.1.21
Precedence	list
List-Id	Bug reports for the GNU Bourne Again SHell <bug-bash.gnu.org>
List-Unsubscribe	<https://lists.gnu.org/mailman/options/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=unsubscribe>
List-Archive	<http://lists.gnu.org/archive/html/bug-bash/>
List-Post	<mailto:bug-bash@gnu.org>
List-Help	<mailto:bug-bash-request@gnu.org?subject=help>
List-Subscribe	<https://lists.gnu.org/mailman/listinfo/bug-bash>, <mailto:bug-bash-request@gnu.org?subject=subscribe>
Xref	csiph.com gnu.bash.bug:14689

Show key headers only | View raw

On 10/5/18 9:33 PM, Mike Gerwitz wrote:
> The following code will cause a segfault on bash-4.4.19(1) on
> GNU Guix.  I reproduced the issue on an old Ubuntu 14.04 LTS running
> bash-4.3.11(1) as well as a Trisquel system running the same version.
> 
>   bash -c 'trap "kill 0" TERM; kill 0'
> 
> Also segfaults when replacing `0' with `$$', and presumably in any other
> situation that would trigger the trap recursively.

Yes. Bash has allowed recursive trap handlers since early 2014 (pre-4.3)
due to requests for the feature and compatibility with other shells that
allow it.

If you manage to create infinite recursion, bash won't stop you.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
		 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

Back to gnu.bash.bug | Previous | Next | Find similar | Unroll thread

Thread

Re: Segfault on recursive trap/kill Chet Ramey <chet.ramey@case.edu> - 2018-10-06 12:33 -0400

csiph-web