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perf evsel: Don't let for_each_group() treat the head of the list as one of its nodes

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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: 717e263fc3 ("perf report: Show group description when event group is enabled")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20230526194442.2355872-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-05-26 12:44:42 -07:00 committed by Arnaldo Carvalho de Melo
parent a90cc5a9ee
commit 797b9ec8c4
2 changed files with 17 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
tools/perf/util/evsel.h
View File

@ -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)
{

1
tools/perf/util/evsel_fprintf.c
View File

@ -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"