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uretprobes: Return probe entry, prepare_uretprobe()

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When a uprobe with return probe consumer is hit, prepare_uretprobe()
function is invoked. It creates return_instance, hijacks return address
and replaces it with the trampoline.

* Return instances are kept as stack per uprobed task.
* Return instance is chained, when the original return address is
  trampoline's page vaddr (e.g. recursive call of the probed function).

Signed-off-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
This commit is contained in:
Anton Arapov 2013-04-03 18:00:35 +02:00 • committed by Oleg Nesterov
parent f15706b79d
commit 0dfd0eb8e4
2 changed files with 92 additions and 1 deletions
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1
include/linux/uprobes.h
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@ -71,6 +71,7 @@ struct uprobe_task {
enum uprobe_task_state state;
struct arch_uprobe_task autask;
struct return_instance *return_instances;
struct uprobe *active_uprobe;
unsigned long xol_vaddr;