Date: Thu, 13 Nov 2014 16:22:09 +0100 From: Petr Matousek <pmatouse@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE-2014-7842 Linux kernel: kvm: reporting emulation failures to userspace It was found that reporting emulation failures to user space can lead to either local or L2->L1 DoS. In the case of local DoS attacker needs access to MMIO area or be able to generate port access. Note that on certain systems HPET is mapped to userspace as part of vdso (vvar) and thus an unprivileged user may generate MMIO transactions (and enter the emulator) this way. Upstream patches: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fc3a9157d314 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a2b9e6c1a35a References: https://bugzilla.redhat.com/show_bug.cgi?id=1163762 -- Petr Matousek / Red Hat Product Security PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3 D874 3E78 6F42 C449 77CA
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