Date: Wed, 20 Feb 2013 01:40:18 +0100 From: Petr Matousek <pmatouse@...hat.com> To: oss-security@...ts.openwall.com Cc: Kurt Seifried <kseifrie@...hat.com> 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: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=027ef6c8 References: https://bugzilla.redhat.com/show_bug.cgi?id=912898 Thanks, -- Petr Matousek / Red Hat Security Response Team
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