mirror of
https://github.com/dynup/kpatch
synced 2025-01-11 07:39:24 +00:00
5e25365244
We merged PR #186 a little too hastily. It seg faults with the new parainstructions-section.patch in the integration test suite. Reverting it for now until we get it figured out. This reverts commite1177e3a03. This reverts commit880e271841. This reverts commit2de5f6cbfb. This reverts commit38b7ac74ad. This reverts commit108cd9f95e.
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
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* Copyright (C) 2013-2014 Josh Poimboeuf <jpoimboe@redhat.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA,
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* 02110-1301, USA.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include "kpatch.h"
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static bool replace;
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module_param(replace, bool, S_IRUGO);
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MODULE_PARM_DESC(replace, "replace all previously loaded patch modules");
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extern char __kpatch_patches, __kpatch_patches_end;
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static struct kpatch_module kpmod;
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static struct kobject *patch_kobj;
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static ssize_t patch_enabled_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", kpmod.enabled);
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}
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static ssize_t patch_enabled_store(struct kobject *kobj,
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struct kobj_attribute *attr, const char *buf,
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size_t count)
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{
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int ret;
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unsigned long val;
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/* only disabling is supported */
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if (!kpmod.enabled)
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return -EINVAL;
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ret = kstrtoul(buf, 10, &val);
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if (ret)
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return ret;
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val = !!val;
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/* only disabling is supported */
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if (val)
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return -EINVAL;
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ret = kpatch_unregister(&kpmod);
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if (ret)
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return ret;
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return count;
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}
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static struct kobj_attribute patch_enabled_attr =
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__ATTR(enabled, 0644, patch_enabled_show, patch_enabled_store);
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static int __init patch_init(void)
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{
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struct kpatch_patch *patches;
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int ret;
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kpmod.mod = THIS_MODULE;
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kpmod.patches = (struct kpatch_patch *)&__kpatch_patches;
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kpmod.patches_nr = (&__kpatch_patches_end - &__kpatch_patches) /
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sizeof(*patches);
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patch_kobj = kobject_create_and_add(THIS_MODULE->name,
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kpatch_patches_kobj);
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if (!patch_kobj) {
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ret = -ENOMEM;
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goto err_free;
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}
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ret = sysfs_create_file(patch_kobj, &patch_enabled_attr.attr);
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if (ret)
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goto err_put;
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ret = kpatch_register(&kpmod, replace);
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if (ret)
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goto err_sysfs;
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return 0;
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err_sysfs:
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sysfs_remove_file(patch_kobj, &patch_enabled_attr.attr);
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err_put:
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kobject_put(patch_kobj);
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err_free:
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return ret;
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}
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static void __exit patch_exit(void)
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{
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WARN_ON(kpmod.enabled);
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sysfs_remove_file(patch_kobj, &patch_enabled_attr.attr);
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kobject_put(patch_kobj);
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}
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module_init(patch_init);
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module_exit(patch_exit);
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MODULE_LICENSE("GPL");
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