[V31,20/25] Lock down /proc/kcore
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Message ID 20190326182742.16950-21-matthewgarrett@google.com
State New, archived
Headers show
Series
  • Add support for kernel lockdown
Related show

Commit Message

Matthew Garrett March 26, 2019, 6:27 p.m. UTC
From: David Howells <dhowells@redhat.com>

Disallow access to /proc/kcore when the kernel is locked down to prevent
access to cryptographic data. This is limited to lockdown
confidentiality mode and is still permitted in integrity mode.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Matthew Garrett <mjg59@google.com>
---
 fs/proc/kcore.c | 2 ++
 1 file changed, 2 insertions(+)

Patch
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diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index bbcc185062bb..1c556a453569 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", LOCKDOWN_CONFIDENTIALITY))
+		return -EPERM;
 	if (!capable(CAP_SYS_RAWIO))
 		return -EPERM;