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Commit a210fd32 authored by Mimi Zohar's avatar Mimi Zohar Committed by James Morris
Browse files

kexec: add call to LSM hook in original kexec_load syscall 



In order for LSMs and IMA-appraisal to differentiate between kexec_load
and kexec_file_load syscalls, both the original and new syscalls must
call an LSM hook.  This patch adds a call to security_kernel_load_data()
in the original kexec_load syscall.

Signed-off-by: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Acked-by: default avatarSerge Hallyn <serge@hallyn.com>
Acked-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarJames Morris <james.morris@microsoft.com>
parent 377179cd

kernel/kexec.c

+8 −0
Original line number Diff line number Diff line
@@ -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_load_data(LOADING_KEXEC_IMAGE);

	if (result < 0)

		return result;



	/*

	 * Verify we have a legal set of flags

	 * This leaves us room for future extensions.