This is a note to let you know that I've just added the patch titled
ftrace: Fix updating of filters for shared global_ops filters
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ftrace-fix-updating-of-filters-for-shared-global_ops-filters.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8f86f83709c585742dea5dd7f0d2b79c43f992ec Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
Date: Tue, 13 Jan 2015 11:20:43 -0500
Subject: ftrace: Fix updating of filters for shared global_ops filters
From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>
commit 8f86f83709c585742dea5dd7f0d2b79c43f992ec upstream.
As the set_ftrace_filter affects both the function tracer as well as the
function graph tracer, the ops that represent each have a shared
ftrace_ops_hash structure. This allows both to be updated when the filter
files are updated.
But if function graph is enabled and the global_ops (function tracing) ops
is not, then it is possible that the filter could be changed without the
update happening for the function graph ops. This will cause the changes
to not take place and may even cause a ftrace_bug to occur as it could mess
with the trampoline accounting.
The solution is to check if the ops uses the shared global_ops filter and
if the ops itself is not enabled, to check if there's another ops that is
enabled and also shares the global_ops filter. In that case, the
modification still needs to be executed.
Link: http://lkml.kernel.org/r/20150114154329.055980438@xxxxxxxxxxx
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/ftrace.c | 26 +++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3786,8 +3786,32 @@ ftrace_match_addr(struct ftrace_hash *ha
static void ftrace_ops_update_code(struct ftrace_ops *ops,
struct ftrace_hash *old_hash)
{
- if (ops->flags & FTRACE_OPS_FL_ENABLED && ftrace_enabled)
+ struct ftrace_ops *op;
+
+ if (!ftrace_enabled)
+ return;
+
+ if (ops->flags & FTRACE_OPS_FL_ENABLED) {
ftrace_run_modify_code(ops, FTRACE_UPDATE_CALLS, old_hash);
+ return;
+ }
+
+ /*
+ * If this is the shared global_ops filter, then we need to
+ * check if there is another ops that shares it, is enabled.
+ * If so, we still need to run the modify code.
+ */
+ if (ops->func_hash != &global_ops.local_hash)
+ return;
+
+ do_for_each_ftrace_op(op, ftrace_ops_list) {
+ if (op->func_hash == &global_ops.local_hash &&
+ op->flags & FTRACE_OPS_FL_ENABLED) {
+ ftrace_run_modify_code(op, FTRACE_UPDATE_CALLS, old_hash);
+ /* Only need to do this once */
+ return;
+ }
+ } while_for_each_ftrace_op(op);
}
static int
Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are
queue-3.18/ftrace-jprobes-x86-fix-conflict-between-jprobes-and-function-graph-tracing.patch
queue-3.18/ftrace-check-both-notrace-and-filter-for-old-hash.patch
queue-3.18/ftrace-fix-updating-of-filters-for-shared-global_ops-filters.patch
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