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Issue 800707 link

Starred by 1 user
Status: WontFix
Owner:
groeck@chromium.org
Closed: Jan 2018
Cc:
wonderfly@google.com
█ sawlani@google.com
chromeos-kernel-security-bug-access@google.com
Components:
EstimatedDays: ----
NextAction: ----
OS: Chrome
Pri: 1
Type: Bug-Security



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CVE-2017-17856 CrOS: Vulnerability reported in Linux kernel

Project Member Reported by vomit.go...@appspot.gserviceaccount.com, Jan 10 2018 
VOMIT (go/vomit) has received an external vulnerability report for the Linux kernel. 

Advisory: CVE-2017-17856
  Details: http://vomit.googleplex.com/advisory?id=CVE/CVE-2017-17856
  CVSS severity score: 7.2/10.0
  Description:

kernel/bpf/verifier.c in the Linux kernel through 4.14.8 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact by leveraging the lack of stack-pointer alignment enforcement.



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, Jan 10 2018

Cc: wonderfly@google.com
Labels: M-65 Security_Severity-High Security_Impact-None Pri-1
Owner: groeck@chromium.org
Status: WontFix (was: Untriaged)
Upstream a5ec6ae161d72f01411169a938fa5f8baea16e8f ("bpf: force strict alignment checks for stack pointers"). Only systems with BPF_SYSCALL enabled are affected, and BPF_SYSCALL is not enabled in ChromeOS. Already fixed in both chromeos-4.4 and chromeos-4.14 through stable release merges.

Comment 2 by wonderfly@google.com, Jan 10 2018

Cc: sawlani@google.com

Comment 3 by groeck@chromium.org, Jan 11 2018 

Correction to #1: Lakitu has BPF_SYSCALL enabled, and the fix is not in chromeos-4.4. However, the problem was introduced with commit f1174f77b50c ("bpf/verifier: rework value tracking"), which is not in chromeos-4.4, and chromeos-4.4 is therefore not affected.
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