forked from Qortal/Brooklyn
2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
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#include <linux/user-return-notifier.h>
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#include <linux/percpu.h>
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#include <linux/sched.h>
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#include <linux/export.h>
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static DEFINE_PER_CPU(struct hlist_head, return_notifier_list);
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/*
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* Request a notification when the current cpu returns to userspace. Must be
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* called in atomic context. The notifier will also be called in atomic
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* context.
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*/
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void user_return_notifier_register(struct user_return_notifier *urn)
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{
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set_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
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hlist_add_head(&urn->link, this_cpu_ptr(&return_notifier_list));
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}
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EXPORT_SYMBOL_GPL(user_return_notifier_register);
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/*
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* Removes a registered user return notifier. Must be called from atomic
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* context, and from the same cpu registration occurred in.
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*/
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void user_return_notifier_unregister(struct user_return_notifier *urn)
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{
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hlist_del(&urn->link);
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if (hlist_empty(this_cpu_ptr(&return_notifier_list)))
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clear_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
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}
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EXPORT_SYMBOL_GPL(user_return_notifier_unregister);
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/* Calls registered user return notifiers */
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void fire_user_return_notifiers(void)
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{
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struct user_return_notifier *urn;
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struct hlist_node *tmp2;
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struct hlist_head *head;
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head = &get_cpu_var(return_notifier_list);
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hlist_for_each_entry_safe(urn, tmp2, head, link)
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urn->on_user_return(urn);
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put_cpu_var(return_notifier_list);
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}
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