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Bug 1513984

Summary:	tevent can cause a Samba file corruption bug under heavy threaded load [rhel-7.4.z]
Product:	Red Hat Enterprise Linux 7	Reporter:	Oneata Mircea Teodor <toneata>
Component:	libtevent	Assignee:	Jakub Hrozek <jhrozek>
Status:	CLOSED ERRATA	QA Contact:	shridhar <sgadekar>
Severity:	urgent	Docs Contact:	Apurva Bhide <abhide>
Priority:	urgent
Version:	7.4	CC:	abhide, asn, enewland, jhrozek, sgoveas, tscherf
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libtevent-0.9.31-2.el7_4	Doc Type:	If docs needed, set a value
Doc Text:	Previously, the tevent_common_wakeup_fd(tctx->wakeup_fd), internal function of the libtevent library was called when a race condition in the tevent threaded code occurred. Here the wakeup_fd was used without the mutex lock and the tctx can be deleted by another thread. Reused memory used to point to the wakeup_fd value that matches to a file descriptor in use by the smbd to write to an on-disk file. As a consequence, libtevent corrupted a file on the disk. With this update, wakeup_fd is saved in a local variable before the mutex is released, so that it always holds the expected file descriptor. As a result, the described problem no longer occurs.	Story Points:	---
Clone Of:	1512414	Environment:
Last Closed:	2018-03-06 21:40:43 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1512414
Bug Blocks:

Description Oneata Mircea Teodor 2017-11-16 12:25:51 UTC

This bug has been copied from bug #1512414 and has been proposed to be backported to 7.4 z-stream (EUS).

Comment 3 Steeve Goveas 2018-02-20 06:52:18 UTC

Verified sanity only with version libtevent-0.9.31-2.el7_4

Comment 6 errata-xmlrpc 2018-03-06 21:40:43 UTC

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-2018:0401