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Message-Id: <20230526194442.2355872-3-irogers@google.com>
Date: Fri, 26 May 2023 12:44:42 -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 v3 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 6d9536ecbc7b..5e8371613565 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -459,16 +459,24 @@ 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 79e42d66f55b..a1655fd7ed9b 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"
--
2.41.0.rc0.172.g3f132b7071-goog
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