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    SubjectRe: [RFC PATCH 2/2] mm: restrict access to /proc/slabinfo
    Hi Vasiliy,

    On Sat, Sep 10, 2011 at 08:41:34PM +0400, Vasiliy Kulikov wrote:
    > Historically /proc/slabinfo has 0444 permissions and is accessible to
    > the world. slabinfo contains rather private information related both to
    > the kernel and userspace tasks. Depending on the situation, it might
    > reveal either private information per se or information useful to make
    > another targeted attack. Some examples of what can be learned by
    > reading/watching for /proc/slabinfo entries:
    > ...
    > World readable slabinfo simplifies kernel developers' job of debugging
    > kernel bugs (e.g. memleaks), but I believe it does more harm than
    > benefits. For most users 0444 slabinfo is an unreasonable attack vector.
    > Signed-off-by: Vasiliy Kulikov <>

    Haven't had any mass complaints about the 0400 in Ubuntu (sorry Dave!), so
    I'm obviously for it.

    Reviewed-by: Kees Cook <>


    Kees Cook
    Ubuntu Security Team

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