From: David Howells <dhowe...@redhat.com>
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>
Signed-off-by: Matthew Garrett <matthewgarr...@google.com>
---
fs/proc/kcore.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index bbcc185062bb..d50ebfbf3dbb 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -518,6 +518,8 @@ 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;
--
2.21.0.392.gf8f6787159e-goog
