Date: Thu, 13 Nov 2014 16:19:52 +0100 From: Petr Matousek <pmatouse@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE-2014-7843 Linux kernel: aarch64: copying from /dev/zero causes local DoS It was found that a read of n*PAGE_SIZE+1 from /dev/zero will cause the kernel to panic due to an unhandled exception since it's not handling the single byte case with a fixup (anything larger than a single byte will properly fault.) A local, unprivileged user could use this flaw to crash the system. Upstream patch proposal: https://lkml.org/lkml/2014/11/12/584 References: https://bugzilla.redhat.com/show_bug.cgi?id=1163744 -- Petr Matousek / Red Hat Product Security PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3 D874 3E78 6F42 C449 77CA
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