Bug 1582155 – sudo blocks in poll() for /dev/ptmx with iolog enabled [rhel-7.5.z]

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Bug 1582155 - sudo blocks in poll() for /dev/ptmx with iolog enabled [rhel-7.5.z]

Summary:	sudo blocks in poll() for /dev/ptmx with iolog enabled [rhel-7.5.z]

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	sudo (Show other bugs)
Sub Component:
Version:	7.4
Hardware:	Unspecified Linux

Priority	urgent Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Daniel Kopeček
QA Contact:	Dalibor Pospíšil
Docs Contact:

URL:
Whiteboard:
Keywords:	Patch, Regression, Reproducer, Triaged, ZStream

Depends On:	1560657
Blocks:
	Show dependency tree / graph

Reported:	2018-05-24 07:54 EDT by Oneata Mircea Teodor
Modified:	2018-06-26 12:52 EDT (History)
CC List:	5 users (show)

See Also:
Fixed In Version:	sudo-1.8.19p2-14.el7_5
Doc Type:	Bug Fix
Doc Text:	Previously, when running a command through sudo that had the I/O logging enabled, a parent process of the command was occasionally blocked in the poll() function execution, waiting for an event on the /dev/ptmx file descriptor. Consequently, a deadlock occurred and sudo might leave the process of the command in an unresponsive state. This update adds a pseudoterminal cleanup logic, and sudo no longer causes a deadlock in the described scenario.
Story Points:	---
Clone Of:	1560657
Environment:
Last Closed:	2018-06-26 12:52:30 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Knowledge Base (Solution)	3404401	None	None	None	2018-05-24 07:54 EDT
Red Hat Product Errata	RHBA-2018:1992	None	None	None	2018-06-26 12:52 EDT

Groups: None (edit)

Description Oneata Mircea Teodor 2018-05-24 07:54:20 EDT

This bug has been copied from bug #1560657 and has been proposed to be backported to 7.5 z-stream (EUS).

Comment 7 errata-xmlrpc 2018-06-26 12:52:30 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://access.redhat.com/errata/RHBA-2018:1992

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