[RFC] [PATCH 2.6.37-rc5-tip 18/20] 18: uprobes: commonly used filters.

[Srikar Dronamraju <srikar@linux.vnet.ibm.com>]

Provides most commonly used filters. Prevents users from having to define
their own filters. However this would be useful once we can
dynamically associate a filter with a uprobe-event tracer.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
 kernel/uprobes.c |   41 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index b0d323c..44a7ff6 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -1190,6 +1190,46 @@ int uprobe_post_notifier(struct pt_regs *regs)
 	return 0;
 }
 
+bool uprobes_pid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+	if (t->tgid == (long)self->fvalue)
+		return true;
+	return false;
+}
+
+bool uprobes_tid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+	if (t->pid == (long)self->fvalue)
+		return true;
+	return false;
+}
+
+bool uprobes_ppid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+	pid_t pid;
+
+	rcu_read_lock();
+	pid = task_tgid_vnr(t->real_parent);
+	rcu_read_unlock();
+
+	if (pid == (long)self->fvalue)
+		return true;
+	return false;
+}
+
+bool uprobes_sid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+	pid_t pid;
+
+	rcu_read_lock();
+	pid = pid_vnr(task_session(t));
+	rcu_read_unlock();
+
+	if (pid == (long)self->fvalue)
+		return true;
+	return false;
+}
+
 struct notifier_block uprobes_exception_nb = {
 	.notifier_call = uprobes_exception_notify,
 	.priority = 0x7ffffff0,
@@ -1207,3 +1247,4 @@ static void __exit exit_uprobes(void)
 
 module_init(init_uprobes);
 module_exit(exit_uprobes);
+