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    SubjectRe: [PATCH] Restrict write access to dmesg_restrict
    Date
    On Mon, 14 Mar 2011 20:35:56 +0100, Richard Weinberger wrote:

    > When dmesg_restrict is set to 1 CAP_SYS_ADMIN is needed to read the
    > kernel ring buffer.
    > But a root user without CAP_SYS_ADMIN is able to reset dmesg_restrict to
    > 0.
    >
    > This is an issue when e.g. LXC (Linux Containers) are used and complete
    > user space is running without CAP_SYS_ADMIN. A unprivileged and jailed
    > root user can bypass the dmesg_restrict protection.
    >
    > With this patch writing to dmesg_restrict is only allowed when root has
    > CAP_SYS_ADMIN.
    >
    > Signed-off-by: Richard Weinberger <richard@nod.at>

    Makes sense.

    Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>

    Thanks.



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