mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
93862e385d
Provide livepatch modules a klp_object (un)patching notification mechanism. Pre and post-(un)patch callbacks allow livepatch modules to setup or synchronize changes that would be difficult to support in only patched-or-unpatched code contexts. Callbacks can be registered for target module or vmlinux klp_objects, but each implementation is klp_object specific. - Pre-(un)patch callbacks run before any (un)patching transition starts. - Post-(un)patch callbacks run once an object has been (un)patched and the klp_patch fully transitioned to its target state. Example use cases include modification of global data and registration of newly available services/handlers. See Documentation/livepatch/callbacks.txt for details and samples/livepatch/ for examples. Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
|
|
* Copyright (C) 2017 Joe Lawrence <joe.lawrence@redhat.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
* livepatch-callbacks-busymod.c - (un)patching callbacks demo support module
|
|
*
|
|
*
|
|
* Purpose
|
|
* -------
|
|
*
|
|
* Simple module to demonstrate livepatch (un)patching callbacks.
|
|
*
|
|
*
|
|
* Usage
|
|
* -----
|
|
*
|
|
* This module is not intended to be standalone. See the "Usage"
|
|
* section of livepatch-callbacks-mod.c.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/delay.h>
|
|
|
|
static int sleep_secs;
|
|
module_param(sleep_secs, int, 0644);
|
|
MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)");
|
|
|
|
static void busymod_work_func(struct work_struct *work);
|
|
static DECLARE_DELAYED_WORK(work, busymod_work_func);
|
|
|
|
static void busymod_work_func(struct work_struct *work)
|
|
{
|
|
pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs);
|
|
msleep(sleep_secs * 1000);
|
|
pr_info("%s exit\n", __func__);
|
|
}
|
|
|
|
static int livepatch_callbacks_mod_init(void)
|
|
{
|
|
pr_info("%s\n", __func__);
|
|
schedule_delayed_work(&work,
|
|
msecs_to_jiffies(1000 * 0));
|
|
return 0;
|
|
}
|
|
|
|
static void livepatch_callbacks_mod_exit(void)
|
|
{
|
|
cancel_delayed_work_sync(&work);
|
|
pr_info("%s\n", __func__);
|
|
}
|
|
|
|
module_init(livepatch_callbacks_mod_init);
|
|
module_exit(livepatch_callbacks_mod_exit);
|
|
MODULE_LICENSE("GPL");
|