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Bug 1513984 - tevent can cause a Samba file corruption bug under heavy threaded load [rhel-7.4.z]
Summary: tevent can cause a Samba file corruption bug under heavy threaded load [rhel-...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libtevent
Version: 7.4
Hardware: Unspecified
OS: Unspecified
urgent
urgent
Target Milestone: rc
: ---
Assignee: Jakub Hrozek
QA Contact: shridhar
Apurva Bhide
URL:
Whiteboard:
Depends On: 1512414
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-11-16 12:25 UTC by Oneata Mircea Teodor
Modified: 2018-03-06 21:40 UTC (History)
6 users (show)

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.
Clone Of: 1512414
Environment:
Last Closed: 2018-03-06 21:40:43 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:0401 0 normal SHIPPED_LIVE libtevent bug fix update 2018-03-07 02:49:45 UTC
Samba Project 13130 0 None None None 2017-11-16 12:25:58 UTC

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
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