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Date: Wed, 17 Jun 2015 14:31:11 +0800
From: Li Bin <huawei.libin@...wei.com>
To: Josh Poimboeuf <jpoimboe@...hat.com>,
Seth Jennings <sjenning@...hat.com>,
Jiri Kosina <jkosina@...e.cz>, Vojtech Pavlik <vojtech@...e.cz>
CC: <live-patching@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<xiexiuqi@...wei.com>, <huawei.libin@...wei.com>
Subject: [PATCH] livepatch: add sysfs interface /sys/kernel/livepatch/state
The added sysfs interface /sys/kernel/livepatch/state is read-only,
it shows the patches that have been applied, incluing the stack index
and the state of each patch.
$ cat /sys/kernel/livepatch/state
Index Patch State
-----------------------------------------------
1 klp_test1 enabled
2 klp_test2 enabled
3 klp_test3 enabled
-----------------------------------------------
$ echo 0 > /sys/kernel/livepatch/klp_test3/enabled
$ cat /sys/kernel/livepatch/state
Index Patch State
-----------------------------------------------
1 klp_test1 enabled
2 klp_test2 enabled
3 klp_test3 disabled
-----------------------------------------------
Signed-off-by: Li Bin <huawei.libin@...wei.com>
---
Documentation/ABI/testing/sysfs-kernel-livepatch | 9 +++++
kernel/livepatch/core.c | 41 +++++++++++++++++++++-
2 files changed, 49 insertions(+), 1 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-kernel-livepatch b/Documentation/ABI/testing/sysfs-kernel-livepatch
index 5bf42a8..01c64da 100644
--- a/Documentation/ABI/testing/sysfs-kernel-livepatch
+++ b/Documentation/ABI/testing/sysfs-kernel-livepatch
@@ -8,6 +8,15 @@ Description:
The /sys/kernel/livepatch directory contains subdirectories for
each loaded live patch module.
+What: /sys/kernel/livepatch/state
+Date: Jun 2015
+KernelVersion: 4.1.0
+Contact: live-patching@...r.kernel.org
+Description:
+ The state file is read-only and shows the patches that have
+ been applied, including the patch stack index and state of
+ each patch.
+
What: /sys/kernel/livepatch/<patch>
Date: Nov 2014
KernelVersion: 3.19.0
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 3f9f1d6..5d004f3 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -604,6 +604,7 @@ EXPORT_SYMBOL_GPL(klp_enable_patch);
* Sysfs Interface
*
* /sys/kernel/livepatch
+ * /sys/kernel/livepatch/state
* /sys/kernel/livepatch/<patch>
* /sys/kernel/livepatch/<patch>/enabled
* /sys/kernel/livepatch/<patch>/<object>
@@ -1008,6 +1009,36 @@ static struct notifier_block klp_module_nb = {
.priority = INT_MIN+1, /* called late but before ftrace notifier */
};
+static ssize_t state_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct klp_patch *patch;
+ unsigned long size = 0;
+ int index = 0;
+ size += snprintf(buf+size, PAGE_SIZE-size-1, "%-5s\t%-26s\t%-8s\n", "Index", "Patch", "State");
+ size += snprintf(buf+size, PAGE_SIZE-size-1, "-----------------------------------------------\n");
+ mutex_lock(&klp_mutex);
+ list_for_each_entry(patch, &klp_patches, list) {
+ size += snprintf(buf+size, PAGE_SIZE-size-1, "%-5d\t%-26s\t%-8s\n",
+ ++index, patch->mod->name, patch->state ? "enabled" : "disabled");
+ }
+ mutex_unlock(&klp_mutex);
+ size += snprintf(buf+size, PAGE_SIZE-size-1, "-----------------------------------------------\n");
+
+ return size;
+}
+static struct kobj_attribute state_kobj_attr = __ATTR_RO(state);
+
+static struct attribute *klp_top_attrs[] = {
+ &state_kobj_attr.attr,
+ NULL
+};
+
+static struct kobj_type klp_ktype_top = {
+ .sysfs_ops = &kobj_sysfs_ops,
+ .default_attrs = klp_top_attrs,
+};
+
static int klp_init(void)
{
int ret;
@@ -1022,12 +1053,20 @@ static int klp_init(void)
if (ret)
return ret;
- klp_root_kobj = kobject_create_and_add("livepatch", kernel_kobj);
+ klp_root_kobj = kzalloc(sizeof(*klp_root_kobj), GFP_KERNEL);
if (!klp_root_kobj) {
ret = -ENOMEM;
goto unregister;
}
+ ret = kobject_init_and_add(klp_root_kobj, &klp_ktype_top,
+ kernel_kobj, "livepatch");
+ if (ret) {
+ kobject_put(klp_root_kobj);
+ klp_root_kobj = NULL;
+ goto unregister;
+ }
+
return 0;
unregister:
--
1.7.7
--
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