From: Divya Indi <divya.indi@oracle.com>
To: linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>
Cc: Divya Indi <divya.indi@oracle.com>, Joe Jin <joe.jin@oracle.com>,
Aruna Ramakrishna <aruna.ramakrishna@oracle.com>,
Srinivas Eeda <srinivas.eeda@oracle.com>
Subject: [PATCH 3/7] tracing: Verify if trace array exists before destroying it.
Date: Mon, 29 Jul 2019 17:02:30 -0700 [thread overview]
Message-ID: <1564444954-28685-4-git-send-email-divya.indi@oracle.com> (raw)
In-Reply-To: <1564444954-28685-1-git-send-email-divya.indi@oracle.com>
A trace array can be destroyed from userspace or kernel. Verify if the
trace array exists before proceeding to destroy/remove it.
Signed-off-by: Divya Indi <divya.indi@oracle.com>
Reviewed-By: Aruna Ramakrishna <aruna.ramakrishna@oracle.com>
---
kernel/trace/trace.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1c80521..468ecc5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -8421,17 +8421,27 @@ static int __remove_instance(struct trace_array *tr)
return 0;
}
-int trace_array_destroy(struct trace_array *tr)
+int trace_array_destroy(struct trace_array *this_tr)
{
+ struct trace_array *tr;
int ret;
- if (!tr)
+ if (!this_tr) {
return -EINVAL;
+ }
mutex_lock(&event_mutex);
mutex_lock(&trace_types_lock);
- ret = __remove_instance(tr);
+ ret = -ENODEV;
+
+ /* Making sure trace array exists before destroying it. */
+ list_for_each_entry(tr, &ftrace_trace_arrays, list) {
+ if (tr == this_tr) {
+ ret = __remove_instance(tr);
+ break;
+ }
+ }
mutex_unlock(&trace_types_lock);
mutex_unlock(&event_mutex);
--
1.8.3.1
next prev parent reply other threads:[~2019-07-30 0:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 0:02 [PATCH 0/7[v3]] Kernel access to Ftrace instances Divya Indi
2019-07-30 0:02 ` [PATCH 1/7] tracing: Required changes to use ftrace_set_clr_event Divya Indi
2019-07-30 0:02 ` [PATCH 2/7] tracing: Declare newly exported APIs in include/linux/trace.h Divya Indi
2019-07-30 0:02 ` Divya Indi [this message]
2019-07-30 0:02 ` [PATCH 4/7] tracing: Adding NULL checks Divya Indi
2019-07-30 0:02 ` [PATCH 5/7] tracing: Handle the trace array ref counter in new functions Divya Indi
2019-07-30 0:02 ` [PATCH 6/7] tracing: New functions for kernel access to Ftrace instances Divya Indi
2019-07-30 0:02 ` [PATCH 7/7] tracing: Un-export ftrace_set_clr_event Divya Indi
2019-07-30 0:51 ` Steven Rostedt
2019-07-30 22:29 ` Divya Indi
2019-08-02 17:42 ` Steven Rostedt
[not found] ` <291a12f6-e1eb-052e-0dd6-0e649dd4a752@oracle.com>
2019-08-02 20:46 ` Steven Rostedt
2019-08-02 21:12 ` Divya Indi
2019-08-02 21:25 ` Steven Rostedt
2019-08-07 18:13 ` Divya Indi
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