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Issue metadata

Status: WontFix
Owner:
Closed: Aug 2017
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: ----
Type: Bug-Security



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CrOS: Vulnerability reported in Linux kernel

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, Jul 28 2017

Issue description

VOMIT (go/vomit) has received an external vulnerability report for the Linux kernel. 

Advisory: CVE-2017-1000363
  Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2017-1000363
  CVSS severity score: 7.2/10.0
  Description:

Linux drivers/char/lp.c Out-of-Bounds Write. Due to a missing bounds check, and the fact that parport_ptr integer is static, a 'secure boot' kernel command line adversary (can happen due to bootloader vulns, e.g. Google Nexus 6's CVE-2016-10277, where due to a vulnerability the adversary has partial control over the command line) can overflow the parport_nr array in the following code, by appending many (>LP_NO) 'lp=none' arguments to the command line.



This bug was filed by http://go/vomit
Please contact us at vomit-team@google.com if you need any assistance.

 

Comment 1 by grundler@google.com, Jul 28 2017

CONFIG_PRINTER is not enabled in any chromeos kernel config.

 ~/trunk/src/third_party/kernel $ fgrep lp.o */drivers/char/Makefile
v3.10/drivers/char/Makefile:obj-$(CONFIG_PRINTER)               += lp.o
v3.14/drivers/char/Makefile:obj-$(CONFIG_PRINTER)               += lp.o
v3.18/drivers/char/Makefile:obj-$(CONFIG_PRINTER)               += lp.o
v3.8/drivers/char/Makefile:obj-$(CONFIG_PRINTER)                += lp.o
v4.4/drivers/char/Makefile:obj-$(CONFIG_PRINTER)                += lp.o

Comment 2 by vakh@chromium.org, Jul 30 2017

Owner: groeck@chromium.org
Status: Assigned (was: Untriaged)

Comment 3 by vakh@chromium.org, Jul 30 2017

Seems like a WontFix but I'll let groeck@ decide.

Comment 4 by groeck@google.com, Aug 2 2017

Already fixed in chromeos-4.4 via stable release merge. Won't fix in older kernerls per #1. Won't apply to stable releases per #1.

Status: WontFix (was: Assigned)

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