From 97da89767d398c1dfa1f34e5f312eb8ebb382f7f Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Tue, 21 Jul 2015 15:40:16 +0200 Subject: uprobes: Export 'struct return_instance', introduce arch_uretprobe_is_alive() Add the new "weak" helper, arch_uretprobe_is_alive(), used by the next patches. It should return true if this return_instance is still valid. The arch agnostic version just always returns true. The patch exports "struct return_instance" for the architectures which want to override this hook. We can also cleanup prepare_uretprobe() if we pass the new return_instance to arch_uretprobe_hijack_return_addr(). Tested-by: Pratyush Anand Signed-off-by: Oleg Nesterov Acked-by: Srikar Dronamraju Acked-by: Anton Arapov Cc: Andy Lutomirski Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/20150721134016.GA4762@redhat.com Signed-off-by: Ingo Molnar --- include/linux/uprobes.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/linux/uprobes.h') diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index 60beb5dc7977..50d2764d66a8 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -92,6 +92,15 @@ struct uprobe_task { unsigned int depth; }; +struct return_instance { + struct uprobe *uprobe; + unsigned long func; + unsigned long orig_ret_vaddr; /* original return address */ + bool chained; /* true, if instance is nested */ + + struct return_instance *next; /* keep as stack */ +}; + struct xol_area; struct uprobes_state { @@ -128,6 +137,7 @@ extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk); extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data); extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs); extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs); +extern bool arch_uretprobe_is_alive(struct return_instance *ret, struct pt_regs *regs); extern bool arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs); extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr, void *src, unsigned long len); -- cgit v1.2.3-59-g8ed1b