linux-kernel - [PATCH v2 2/3] tracing: Check keys for variable references in expressions too

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Message-Id: <e8c3d3d53db5ca90ceea5a46e5413103a6902fc7.1555597045.git.tom.zanussi@linux.intel.com>
Date:   Thu, 18 Apr 2019 10:18:51 -0500
From:   Tom Zanussi <zanussi@...nel.org>
To:     rostedt@...dmis.org
Cc:     vincent@...nat.ch, linux-kernel@...r.kernel.org,
        linux-rt-users@...r.kernel.org
Subject: [PATCH v2 2/3] tracing: Check keys for variable references in expressions too

From: Tom Zanussi <tom.zanussi@...ux.intel.com>

There's an existing check for variable references in keys, but it
doesn't go far enough.  It checks whether a key field is a variable
reference but doesn't check whether it's an expression containing
variable references, which can cause the same problems for callers.

Use the existing field_has_hist_vars() function rather than a direct
top-level flag check to catch all possible variable references.

Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
Reported-by: Vincent Bernat <vincent@...nat.ch>
---
 kernel/trace/trace_events_hist.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 453f51ef83ca..cb56c7c456fa 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -59,7 +59,7 @@
 	C(NO_CLOSING_PAREN,	"No closing paren found"),		\
 	C(SUBSYS_NOT_FOUND,	"Missing subsystem"),			\
 	C(INVALID_SUBSYS_EVENT,	"Invalid subsystem or event name"),	\
-	C(INVALID_REF_KEY,	"Using variable references as keys not supported"), \
+	C(INVALID_REF_KEY,	"Using variable references in keys not supported"), \
 	C(VAR_NOT_FOUND,	"Couldn't find variable"),		\
 	C(FIELD_NOT_FOUND,	"Couldn't find field"),
 
@@ -4506,7 +4506,7 @@ static int create_key_field(struct hist_trigger_data *hist_data,
 			goto out;
 		}
 
-		if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
+		if (field_has_hist_vars(hist_field, 0))	{
 			hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
 			destroy_hist_field(hist_field, 0);
 			ret = -EINVAL;
-- 
2.14.1