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Issue metadata

Status: WontFix
Owner:
Closed: May 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 3
Type: Bug-Security



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CVE-2017-18261 CrOS: Vulnerability reported in Linux kernel

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, May 23 2018

Issue description

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

Advisory: CVE-2017-18261
  Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2017-18261
  CVSS severity score: 4.9/10.0
  Description:

The arch_timer_reg_read_stable macro in arch/arm64/include/asm/arch_timer.h in the Linux kernel before 4.13 allows local users to cause a denial of service (infinite recursion) by writing to a file under /sys/kernel/debug in certain circumstances, as demonstrated by a scenario involving debugfs, ftrace, PREEMPT_TRACER, and FUNCTION_GRAPH_TRACER.



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

 

Comment 1 by groeck@chromium.org, May 23 2018

Cc: wonderfly@google.com zsm@chromium.org
Labels: Security_Severity-Medium Security_Impact-None Pri-3
Owner: groeck@chromium.org
Status: WontFix (was: Untriaged)
Upstream commit adb4f11e0a8 ("clocksource/drivers/arm_arch_timer: Avoid infinite recursion when ftrace is enabled"). chromeos-4.14 is not affected. The problem was introduced with commit 6acc71ccac7187 ("arm64: arch_timer: Allows a CPU-specific erratum to only affect a subset of CPUs") which is not in chromeos-4.4 or older kernels. No action required.

Cc: rkolchmeyer@google.com

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