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authorDavid Howells <dhowells@redhat.com>2019-08-19 17:17:57 -0700
committerJames Morris <jmorris@namei.org>2019-08-19 21:54:16 -0700
commit02e935bf5b34edcc4cb0dc532dd0e1a1bfb33b51 (patch)
treed1029d3f5dccd6dbba74b1d0b445fa2b5ee4ffb4 /fs/proc
parentx86/mmiotrace: Lock down the testmmiotrace module (diff)
downloadlinux-dev-02e935bf5b34edcc4cb0dc532dd0e1a1bfb33b51.tar.xz
linux-dev-02e935bf5b34edcc4cb0dc532dd0e1a1bfb33b51.zip
lockdown: Lock down /proc/kcore
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> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/kcore.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index f5834488b67d..ee2c576cc94e 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -31,6 +31,7 @@
#include <linux/ioport.h>
#include <linux/memory.h>
#include <linux/sched/task.h>
+#include <linux/security.h>
#include <asm/sections.h>
#include "internal.h"
@@ -545,6 +546,10 @@ out:
static int open_kcore(struct inode *inode, struct file *filp)
{
+ int ret = security_locked_down(LOCKDOWN_KCORE);
+
+ if (ret)
+ return ret;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;