Allow LSMs and IMA to differentiate between the kexec_load and
kexec_file_load syscalls by adding an "unnecessary" call to
security_kernel_read_file() in kexec_load.  This would be similar to the
existing init_module syscall calling security_kernel_read_file().

Signed-off-by: Mimi Zohar <zo...@linux.vnet.ibm.com>
---
 kernel/kexec.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/kernel/kexec.c b/kernel/kexec.c
index aed8fb2564b3..d1386cfc6796 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>
@@ -195,11 +196,21 @@ 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;
 
        /*
+        * Allow LSMs and IMA to differentiate between kexec_load and
+        * kexec_file_load syscalls.
+        */
+       result = security_kernel_read_file(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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