In order for LSMs and IMA-appraisal to differentiate between the
original and new syscalls, both the original and new syscalls must call
an LSM hook. This patch adds a call to security_kernel_read_data() in
the original kexec syscall.
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Luis R. Rodriguez <mcgrof@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
---
kernel/kexec.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index aed8fb2564b3..061ada41c18c 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -11,6 +11,7 @@
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/file.h>
+#include <linux/security.h>
#include <linux/kexec.h>
#include <linux/mutex.h>
#include <linux/list.h>
@@ -195,10 +196,17 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
static inline int kexec_load_check(unsigned long nr_segments,
unsigned long flags)
{
+ int result;
+
/* We only trust the superuser with rebooting the system. */
if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
return -EPERM;
+ /* Permit LSMs and IMA to fail the kexec */
+ result = security_kernel_read_data(NULL, READING_KEXEC_IMAGE);
+ if (result < 0)
+ return result;
+
/*
* Verify we have a legal set of flags
* This leaves us room for future extensions.
--
2.7.5
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