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Subject[PATCH 25/27] 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>
---

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

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 45629f4b5402..176cf749e650 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -549,6 +549,8 @@ 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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