Disallow access to /proc/kcore when the kernel is locked down to prevent
access to cryptographic data.

Signed-off-by: David Howells <dhowe...@redhat.com>
Reviewed-by: James Morris <james.l.mor...@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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