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Bug 1189864 - (CVE-2015-4036) CVE-2015-4036 kernel: potential memory corruption (denial of service) in vhost/scsi driver
CVE-2015-4036 kernel: potential memory corruption (denial of service) in vhos...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20150205,repor...
: Security
Depends On: 1192079
Blocks: 1189866
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Reported: 2015-02-05 11:44 EST by Vasyl Kaigorodov
Modified: 2015-05-29 08:41 EDT (History)
32 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw exists in the kernels configfs interface to manipulate or control the vhost scsi subsection. Unchecked directory names in configfs may unintentionally corrupt memory or panic the system.
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Clone Of:
Environment:
Last Closed: 2015-05-29 08:41:36 EDT
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Regression: ---
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Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
kernel_vhost_scsi.patch (1.01 KB, text/plain)
2015-02-05 11:44 EST, Vasyl Kaigorodov 		no flags Details
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Description Vasyl Kaigorodov 2015-02-05 11:44:00 EST 
It was reported that in vhost_scsi_make_tpg() the limit for "tpgt" is UINT_MAX but the data type of "tpg->tport_tpgt" and that is a u16.

In the context it turns out that in vhost_scsi_set_endpoint(), "tpg->tport_tpgt" is used as an offset into the vs_tpg[] array which has VHOST_SCSI_MAX_TARGET (256) elements, so anything higher than 255 then is invalid. Attached patch corrects this.
In vhost_scsi_send_evt() the values higher than 255 are masked, but now that the limit has changed, the mask is not needed.

Upstream fix:
http://www.spinics.net/lists/linux-scsi/msg82650.html

Discussion:
http://www.openwall.com/lists/oss-security/2015/05/13/4
Comment 1 Vasyl Kaigorodov 2015-02-05 11:44:56 EST 
Created attachment 988570 [details]
kernel_vhost_scsi.patch
Comment 2 Vasyl Kaigorodov 2015-02-12 10:21:21 EST 
Statement:

Not vulnerable. This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6 and 7, and Red Hat Enterprise MRG as they do not have CONFIG_VHOST_SCSI directive enabled in the build configuration.
Comment 3 Vasyl Kaigorodov 2015-02-12 10:22:14 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1192079]
Comment 5 Petr Matousek 2015-02-20 09:02:40 EST 
References:

http://www.spinics.net/lists/linux-scsi/msg82650.html
Comment 6 Fedora Update System 2015-03-09 04:17:21 EDT 
kernel-3.18.8-201.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2015-03-14 05:15:30 EDT 
kernel-3.18.9-100.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
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