Bug 1268958 – sudo - cmnd_no_wait can cause child processes to ignore SIGPIPE

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Bug 1268958 - sudo - cmnd_no_wait can cause child processes to ignore SIGPIPE

Summary:	sudo - cmnd_no_wait can cause child processes to ignore SIGPIPE

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	sudo (Show other bugs)
Sub Component:
Version:	7.1
Hardware:	Unspecified Linux

Priority	medium Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Daniel Kopeček
QA Contact:	Stefan Kremen
Docs Contact:

URL:
Whiteboard:
Keywords:	Patch

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2015-10-05 14:15 EDT by Dalibor Pospíšil
Modified:	2016-11-03 16:31 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:	sudo-1.8.6p7-18.el7
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:	1094548
Environment:
Last Closed:	2016-11-03 16:31:50 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
proposed patch (554 bytes, patch) 2016-05-10 05:16 EDT, Daniel Kopeček	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:2593	normal	SHIPPED_LIVE	Low: sudo security, bug fix, and enhancement update	2016-11-03 08:10:56 EDT

Groups: None (edit)

Description Dalibor Pospíšil 2015-10-05 14:15:02 EDT

+++ This bug was initially created as a clone of Bug #1094548 +++

Description of problem:

The bug 1094548 appears to be present also on RHEL7.

Version-Release number of selected component (if applicable):
sudo-1.8.6p7-13.el7


How reproducible:

Always


Steps to Reproduce:

1. Set "Defaults cmnd_no_wait" in /etc/sudoers

2. Run the following command all together:

    $ sudo -k; sudo bash -c "yes | fold | head -n1"

   Note: As mentioned below, the sudo -k is important to ensure there
         is an out of date cache. [1]

Actual results:

 Sudo ignores SIGPIPE somewhere in the authentication stack, perhaps
 in src/tgetpass.c.  Thus the command hangs.


Expected results:

  The chain executed by sudo should not hang in these cases.

Comment 3 Daniel Kopeček 2016-05-10 05:16 EDT

Created attachment 1155628 [details]
proposed patch

Comment 7 errata-xmlrpc 2016-11-03 16:31:50 EDT

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2593.html

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