linux-kernel - [PATCH v1 2/2] perf evsel: for_each

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Date:   Mon, 22 May 2023 21:44:46 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Sandipan Das <sandipan.das@....com>,
        James Clark <james.clark@....com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Changbin Du <changbin.du@...wei.com>,
        Rob Herring <robh@...nel.org>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/2] perf evsel: for_each_group fixes

Address/memory sanitizer was reporting issues in evsel__group_pmu_name
because the for_each_group_evsel loop didn't terminate when the head
was reached, the head would then be cast and accessed as an evsel
leading to invalid memory accesses. Fix for_each_group_member and
for_each_group_evsel to terminate at the list head. Note,
evsel__group_pmu_name no longer iterates the group, but the problem is
present regardless.

Fixes: 717e263fc354 ("perf report: Show group description when event group is enabled")
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/evsel.h         | 24 ++++++++++++++++--------
 tools/perf/util/evsel_fprintf.c |  1 +
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 820771a649b2..6a64543c7612 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -462,16 +462,24 @@ static inline int evsel__group_idx(struct evsel *evsel)
 }
 
 /* Iterates group WITHOUT the leader. */
-#define for_each_group_member(_evsel, _leader) 					\
-for ((_evsel) = list_entry((_leader)->core.node.next, struct evsel, core.node); \
-     (_evsel) && (_evsel)->core.leader == (&_leader->core);					\
-     (_evsel) = list_entry((_evsel)->core.node.next, struct evsel, core.node))
+#define for_each_group_member_head(_evsel, _leader, _head)				\
+for ((_evsel) = list_entry((_leader)->core.node.next, struct evsel, core.node);		\
+	(_evsel) && (&(_evsel)->core.node != (_head)) &&				\
+	(_evsel)->core.leader == (&_leader->core);					\
+	(_evsel) = list_entry((_evsel)->core.node.next, struct evsel, core.node))
+
+#define for_each_group_member(_evsel, _leader)				\
+	for_each_group_member_head(_evsel, _leader, &(_leader)->evlist->core.entries)
 
 /* Iterates group WITH the leader. */
-#define for_each_group_evsel(_evsel, _leader) 					\
-for ((_evsel) = _leader; 							\
-     (_evsel) && (_evsel)->core.leader == (&_leader->core);					\
-     (_evsel) = list_entry((_evsel)->core.node.next, struct evsel, core.node))
+#define for_each_group_evsel_head(_evsel, _leader, _head)				\
+for ((_evsel) = _leader;								\
+	(_evsel) && (&(_evsel)->core.node != (_head)) &&				\
+	(_evsel)->core.leader == (&_leader->core);					\
+	(_evsel) = list_entry((_evsel)->core.node.next, struct evsel, core.node))
+
+#define for_each_group_evsel(_evsel, _leader)				\
+	for_each_group_evsel_head(_evsel, _leader, &(_leader)->evlist->core.entries)
 
 static inline bool evsel__has_branch_callstack(const struct evsel *evsel)
 {
diff --git a/tools/perf/util/evsel_fprintf.c b/tools/perf/util/evsel_fprintf.c
index cc80ec554c0a..036a2171dc1c 100644
--- a/tools/perf/util/evsel_fprintf.c
+++ b/tools/perf/util/evsel_fprintf.c
@@ -2,6 +2,7 @@
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdbool.h>
+#include "util/evlist.h"
 #include "evsel.h"
 #include "util/evsel_fprintf.h"
 #include "util/event.h"
-- 
2.40.1.698.g37aff9b760-goog