From: Mimi Zohar <zohar@linux.vnet.ibm.com>
To: linux-integrity@vger.kernel.org
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Luis R . Rodriguez" <mcgrof@kernel.org>,
Eric Biederman <ebiederm@xmission.com>,
kexec@lists.infradead.org, Andres Rodriguez <andresx7@gmail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kees Cook <keescook@chromium.org>
Subject: [PATCH v6 2/8] kexec: add call to LSM hook in original kexec_load syscall
Date: Fri, 13 Jul 2018 14:05:57 -0400 [thread overview]
Message-ID: <1531505163-20227-3-git-send-email-zohar@linux.vnet.ibm.com> (raw)
In-Reply-To: <1531505163-20227-1-git-send-email-zohar@linux.vnet.ibm.com>
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: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Acked-by: Serge Hallyn <serge@hallyn.com>
---
kernel/kexec.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index aed8fb2564b3..68559808fdfa 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_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.
--
2.7.5
next prev parent reply other threads:[~2018-07-13 18:07 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-13 18:05 [PATCH v6 0/8] kexec/firmware: support system wide policy requiring signatures Mimi Zohar
2018-07-13 18:05 ` [PATCH v6 1/8] security: define new LSM hook named security_kernel_load_data Mimi Zohar
2018-07-15 2:13 ` Kees Cook
2018-07-13 18:05 ` Mimi Zohar [this message]
2018-07-15 2:14 ` [PATCH v6 2/8] kexec: add call to LSM hook in original kexec_load syscall Kees Cook
2018-07-13 18:05 ` [PATCH v6 3/8] ima: based on policy require signed kexec kernel images Mimi Zohar
2018-07-15 2:21 ` Kees Cook
2018-07-13 18:05 ` [PATCH v6 4/8] firmware: add call to LSM hook before firmware sysfs fallback Mimi Zohar
2018-07-15 2:24 ` Kees Cook
2018-07-13 18:06 ` [PATCH v6 5/8] ima: based on policy require signed firmware (sysfs fallback) Mimi Zohar
2018-07-15 2:27 ` Kees Cook
2018-07-13 18:06 ` [PATCH v6 6/8] ima: add build time policy Mimi Zohar
2018-07-15 2:28 ` Kees Cook
2018-07-13 18:06 ` [PATCH v6 7/8] module: replace the existing LSM hook in init_module Mimi Zohar
2018-07-15 2:30 ` Kees Cook
2018-07-16 13:52 ` Mimi Zohar
2018-07-13 18:06 ` [PATCH v6 8/8] ima: based on policy warn about loading firmware (pre-allocated buffer) Mimi Zohar
2018-07-15 2:34 ` Kees Cook
2018-07-16 19:59 ` [PATCH v6 0/8] kexec/firmware: support system wide policy requiring signatures James Morris
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