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    Subject[PATCH 20/24] Lock down /proc/kcore
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    Disallow access to /proc/kcore when the kernel is locked down to prevent
    access to cryptographic data.

    Signed-off-by: David Howells <dhowells@redhat.com>
    Reviewed-by: James Morris <james.l.morris@oracle.com>
    ---

    fs/proc/kcore.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
    index d1e82761de81..cdebdee81719 100644
    --- a/fs/proc/kcore.c
    +++ b/fs/proc/kcore.c
    @@ -546,6 +546,8 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)

    static int open_kcore(struct inode *inode, struct file *filp)
    {
    + if (kernel_is_locked_down("/proc/kcore"))
    + return -EPERM;
    if (!capable(CAP_SYS_RAWIO))
    return -EPERM;

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