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Subject[PATCH v3 2.6.39-rc1-tip 18/26] 18: uprobes: commonly used filters.

Provides most commonly used filters that most users of uprobes can
reuse. 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>
---
include/linux/uprobes.h | 5 +++++
kernel/uprobes.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+), 0 deletions(-)

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 26c4d78..34b989f 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -65,6 +65,11 @@ struct uprobe_consumer {
struct uprobe_consumer *next;
};

+struct uprobe_simple_consumer {
+ struct uprobe_consumer consumer;
+ pid_t fvalue;
+};
+
struct uprobe {
struct rb_node rb_node; /* node in the rb tree */
atomic_t ref;
diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index cdd52d0..c950f13 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -1389,6 +1389,56 @@ int uprobe_post_notifier(struct pt_regs *regs)
return 0;
}

+bool uprobes_pid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+ struct uprobe_simple_consumer *usc;
+
+ usc = container_of(self, struct uprobe_simple_consumer, consumer);
+ if (t->tgid == usc->fvalue)
+ return true;
+ return false;
+}
+
+bool uprobes_tid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+ struct uprobe_simple_consumer *usc;
+
+ usc = container_of(self, struct uprobe_simple_consumer, consumer);
+ if (t->pid == usc->fvalue)
+ return true;
+ return false;
+}
+
+bool uprobes_ppid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+ pid_t pid;
+ struct uprobe_simple_consumer *usc;
+
+ usc = container_of(self, struct uprobe_simple_consumer, consumer);
+ rcu_read_lock();
+ pid = task_tgid_vnr(t->real_parent);
+ rcu_read_unlock();
+
+ if (pid == usc->fvalue)
+ return true;
+ return false;
+}
+
+bool uprobes_sid_filter(struct uprobe_consumer *self, struct task_struct *t)
+{
+ pid_t pid;
+ struct uprobe_simple_consumer *usc;
+
+ usc = container_of(self, struct uprobe_simple_consumer, consumer);
+ rcu_read_lock();
+ pid = pid_vnr(task_session(t));
+ rcu_read_unlock();
+
+ if (pid == usc->fvalue)
+ return true;
+ return false;
+}
+
struct notifier_block uprobes_exception_nb = {
.notifier_call = uprobes_exception_notify,
.priority = 0x7ffffff0,

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