Date: Mon, 20 Jun 2011 18:32:20 +0200 From: Petr Matousek <pmatouse@...hat.com> To: oss-security@...ts.openwall.com Cc: "Steven M. Christey" <coley@...us.mitre.org> Subject: CVE request: kernel: thp: madvise on top of /dev/zero private mapping can lead to panic Description of problem: The huge_memory.c THP page fault was allowed to run if vm_ops was null (which would succeed for /dev/zero MAP_PRIVATE, as the f_op->mmap wouldn't setup a special vma->vm_ops and it would fallback to regular anonymous memory) but other THP logics weren't fully activated for vmas with vm_file not NULL (/dev/zero has a not NULL vma->vm_file). Unprivileged local user could use this flaw to crash the server. Upstream patch: 78f11a255749d09025f54d4e2df4fbcb031530e2 References: https://bugzilla.redhat.com/show_bug.cgi?id=714761 https://bugzilla.kernel.org/show_bug.cgi?id=33682 http://www.spinics.net/lists/stable-commits/msg11762.html Thanks, -- Petr Matousek / Red Hat Security Response Team
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