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 <panand@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Anton Arapov <arapov@gmail.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20150721134016.GA4762@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 60beb5d..50d2764 100644 (file)
--- 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);

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 98e4d97..1c71b62 100644 (file)
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -86,15 +86,6 @@ struct uprobe {
        struct arch_uprobe      arch;
 };
 
-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 */
-};
-
 /*
  * Execute out of line area: anonymous executable mapping installed
  * by the probed task to execute the copy of the original instruction
@@ -1818,6 +1809,11 @@ bool __weak arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs)
        return false;
 }
 
+bool __weak arch_uretprobe_is_alive(struct return_instance *ret, struct pt_regs *regs)
+{
+       return true;
+}
+
 /*
  * Run handler and ask thread to singlestep.
  * Ensure all non-fatal signals cannot interrupt thread while it singlesteps.