[07/16] kexec: Disable at runtime if the kernel is locked down

Commit Message

David Howells Nov. 16, 2016, 9:48 p.m. UTC

From: Matthew Garrett <[e-mail]>

kexec permits the loading and execution of arbitrary code in ring 0, which
is something that lock-down is meant to prevent. It makes sense to disable
kexec in this situation.

This does not affect kexec_file_load() which can check for a signature on the
image to be booted.

Signed-off-by: Matthew Garrett <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
---

 kernel/kexec.c |    8 ++++++++
 1 file changed, 8 insertions(+)


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Patch

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 980936a90ee6..c6aa4620d1bf 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -12,6 +12,7 @@ 
 #include <linux/mm.h>
 #include <linux/file.h>
 #include <linux/kexec.h>
+#include <linux/security.h>
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/syscalls.h>
@@ -194,6 +195,13 @@  SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
 		return -EPERM;
 
 	/*
+	 * kexec can be used to circumvent module loading restrictions, so
+	 * prevent loading in that case
+	 */
+	if (kernel_is_locked_down())
+		return -EPERM;
+
+	/*
 	 * Verify we have a legal set of flags
 	 * This leaves us room for future extensions.
 	 */