Date: Fri, 18 Sep 2009 08:48:50 +0800 From: Eugene Teo <eugeneteo@...nel.sg> To: oss-security@...ts.openwall.com CC: "Steven M. Christey" <coley@...us.mitre.org> Subject: CVE request: kernel: KVM: x86: Disallow hypercalls for guest callers in rings > 0 "So far unprivileged guest callers running in ring 3 can issue, e.g., MMU hypercalls. Normally, such callers cannot provide any hand-crafted MMU command structure as it has to be passed by its physical address, but they can still crash the guest kernel by passing random addresses. To close the hole, this patch considers hypercalls valid only if issued from guest ring 0. This may still be relaxed on a per-hypercall base in the future once required." This was introduced in v2.6.25-rc1, and fixed in 2.6.31. cvss2=7.2/AV:L/AC:L/Au:N/C:C/I:C/A:C Upstream commit: http://git.kernel.org/linus/07708c4af1346ab1521b26a202f438366b7bcffd References: http://patchwork.kernel.org/patch/38926/ https://bugzilla.redhat.com/show_bug.cgi?id=524124 Thanks, Eugene
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.