[20/24] Lock down /proc/kcore

Commit Message

David Howells April 11, 2018, 4:26 p.m. UTC

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

Signed-off-by: David Howells <[e-mail]>
Reviewed-by: James Morris <[e-mail]>
---

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


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Patch

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;