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perf tools: Fix crash caused by accessing feat_ops[HEADER_LAST_FEATURE] 

perf_event__process_feature() accesses feat_ops[HEADER_LAST_FEATURE]
which is not defined and thus perf is crashing. HEADER_LAST_FEATURE is
used as an end marker for the perf report but it's unused for perf
script/annotate. Ignore HEADER_LAST_FEATURE for perf script/annotate,
just like it is done in 'perf report'.

Before:
  # perf record -o - ls | perf script
  <SNIP 'ls' output>
  Segmentation fault (core dumped)
  #

After:
  # perf record -o - ls | perf script
  <SNIP 'ls' output>
  Segmentation fault (core dumped)
  ls 7031 4392.099856:  250000 cpu-clock:uhH:  7f5e0ce7cd60
  ls 7031 4392.100355:  250000 cpu-clock:uhH:  7f5e0c706ef7
  #

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: David Carrillo-Cisneros <davidcc@google.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Fixes: 57b5de4639 ("perf report: Support forced leader feature in pipe mode")
Link: http://lkml.kernel.org/r/20180625124220.6434-4-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ravi Bangoria 2018-06-25 18:12:20 +05:30 committed by Arnaldo Carvalho de Melo
parent a3af66f51b
commit 92ead7ee30
4 changed files with 23 additions and 4 deletions
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11
tools/perf/builtin-annotate.c
View File

@ -283,6 +283,15 @@ static int process_sample_event(struct perf_tool *tool,
return ret;
}
static int process_feature_event(struct perf_tool *tool,
union perf_event *event,
struct perf_session *session)
{
if (event->feat.feat_id < HEADER_LAST_FEATURE)
return perf_event__process_feature(tool, event, session);
return 0;
}
static int hist_entry__tty_annotate(struct hist_entry *he,
struct perf_evsel *evsel,
struct perf_annotate *ann)
@ -471,7 +480,7 @@ int cmd_annotate(int argc, const char **argv)
.attr = perf_event__process_attr,
.build_id = perf_event__process_build_id,
.tracing_data = perf_event__process_tracing_data,
.feature = perf_event__process_feature,
.feature = process_feature_event,
.ordered_events = true,
.ordering_requires_timestamps = true,
},

3
tools/perf/builtin-report.c
View File

@ -217,7 +217,8 @@ static int process_feature_event(struct perf_tool *tool,
}
/*
* All features are received, we can force the
* (feat_id = HEADER_LAST_FEATURE) is the end marker which
* means all features are received, now we can force the
* group if needed.
*/
setup_forced_leader(rep, session->evlist);

11
tools/perf/builtin-script.c
View File

@ -3044,6 +3044,15 @@ int process_cpu_map_event(struct perf_tool *tool __maybe_unused,
return set_maps(script);
}
static int process_feature_event(struct perf_tool *tool,
union perf_event *event,
struct perf_session *session)
{
if (event->feat.feat_id < HEADER_LAST_FEATURE)
return perf_event__process_feature(tool, event, session);
return 0;
}
#ifdef HAVE_AUXTRACE_SUPPORT
static int perf_script__process_auxtrace_info(struct perf_tool *tool,
union perf_event *event,
@ -3088,7 +3097,7 @@ int cmd_script(int argc, const char **argv)
.attr = process_attr,
.event_update = perf_event__process_event_update,
.tracing_data = perf_event__process_tracing_data,
.feature = perf_event__process_feature,
.feature = process_feature_event,
.build_id = perf_event__process_build_id,
.id_index = perf_event__process_id_index,
.auxtrace_info = perf_script__process_auxtrace_info,

2
tools/perf/util/header.c
View File

@ -3464,7 +3464,7 @@ int perf_event__process_feature(struct perf_tool *tool,
pr_warning("invalid record type %d in pipe-mode\n", type);
return 0;
}
if (feat == HEADER_RESERVED || feat > HEADER_LAST_FEATURE) {
if (feat == HEADER_RESERVED || feat >= HEADER_LAST_FEATURE) {
pr_warning("invalid record type %d in pipe-mode\n", type);
return -1;
}