Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Wed, 20 Feb 2013 01:40:18 +0100
From: Petr Matousek <>
Cc: Kurt Seifried <>
Subject: CVE request -- Linux kernel: mm: thp: pmd_present and PROT_NONE
 local DoS

Most VM places are using pmd_none but a few are still using pmd_present.
The meaning is about the same for the pmd. However pmd_present would
return the wrong value on PROT_NONE ranges. When the code using
pmd_present gets a false negative, the kernel will crash.

An unprivileged local user could use this flaw to crash the system.

Upstream fix:;a=commit;h=027ef6c8


Petr Matousek / Red Hat Security Response Team

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.