Bug 1430225 – kernel: fix crash in uio_release

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Bug 1430225 - kernel: fix crash in uio_release

Summary:	kernel: fix crash in uio_release

Status:	CLOSED ERRATA

Aliases:	None

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

Priority	high Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Mike Christie
QA Contact:	Martin Hoyer
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:	1408292 1449245 1468963
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Reported:	2017-03-07 23:57 EST by Mike Christie
Modified:	2017-08-02 01:50 EDT (History)
CC List:	9 users (show)

See Also:
Fixed In Version:	kernel-3.10.0-690.el7
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-08-02 01:50:07 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:1842	normal	SHIPPED_LIVE	Important: kernel security, bug fix, and enhancement update	2017-08-01 14:22:09 EDT

Groups: None (edit)

Description Mike Christie 2017-03-07 23:57:08 EST

Description of problem:

We hit this crash when adding/deleting devices:

https://lkml.org/lkml/2015/3/11/514

The problem is that target_core_user calls tcmu_free_device -> tcmu_netlink_event (TCMU_CMD_REMOVED_DEVICE) -> uio_unregister_device. It does not wait for the TCMU_CMD_REMOVED_DEVICE userspace handler to close the uio device, so if the uio_unregister_device is faster than userspace we will hit the uio_release crash because the uio_device will be freed.


Version-Release number of selected component (if applicable):


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Additional info:

Comment 14 Rafael Aquini 2017-06-28 23:05:28 EDT

Patch(es) committed on kernel repository and an interim kernel build is undergoing testing

Comment 16 Rafael Aquini 2017-06-29 08:34:16 EDT

Patch(es) available on kernel-3.10.0-690.el7

Comment 18 Martin Hoyer 2017-07-04 04:18:58 EDT

Regression tests on RHEL-7.4-20170630.1 w/ kernel-3.10.0-691.el7 have not found any new issue. Moving to VERIFIED as per comment#11

Comment 20 errata-xmlrpc 2017-08-02 01:50:07 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/RHSA-2017:1842

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