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selftests/livepatch: introduce tests

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Add a few livepatch modules and simple target modules that the included
regression suite can run tests against:

  - basic livepatching (multiple patches, atomic replace)
  - pre/post (un)patch callbacks
  - shadow variable API

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Tested-by: Miroslav Benes <mbenes@suse.cz>
Tested-by: Alice Ferrazzi <alice.ferrazzi@gmail.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Joe Lawrence 2019-01-09 13:43:29 +01:00 • committed by Jiri Kosina
parent d67a537209
commit a2818ee4dc
20 changed files with 1740 additions and 485 deletions
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57
lib/livepatch/test_klp_atomic_replace.c Normal file
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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/livepatch.h>
static int replace;
module_param(replace, int, 0644);
MODULE_PARM_DESC(replace, "replace (default=0)");
#include <linux/seq_file.h>
static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%s: %s\n", THIS_MODULE->name,
"this has been live patched");
return 0;
}
static struct klp_func funcs[] = {
{
.old_name = "meminfo_proc_show",
.new_func = livepatch_meminfo_proc_show,
}, {}
};
static struct klp_object objs[] = {
{
/* name being NULL means vmlinux */
.funcs = funcs,
}, {}
};
static struct klp_patch patch = {
.mod = THIS_MODULE,
.objs = objs,
/* set .replace in the init function below for demo purposes */
};
static int test_klp_atomic_replace_init(void)
{
patch.replace = replace;
return klp_enable_patch(&patch);
}
static void test_klp_atomic_replace_exit(void)
{
}
module_init(test_klp_atomic_replace_init);
module_exit(test_klp_atomic_replace_exit);
MODULE_LICENSE("GPL");
MODULE_INFO(livepatch, "Y");
MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
MODULE_DESCRIPTION("Livepatch test: atomic replace");