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Date: Wed, 29 Apr 2015 15:11:32 +0300 From: Adrian Hunter <adrian.hunter@...el.com> To: Jiri Olsa <jolsa@...hat.com> CC: Arnaldo Carvalho de Melo <acme@...nel.org>, Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>, Frederic Weisbecker <fweisbec@...il.com>, Namhyung Kim <namhyung@...il.com>, Stephane Eranian <eranian@...gle.com> Subject: Re: [PATCH V3 04/25] perf tools: Add AUX area tracing index On 28/04/15 15:32, Jiri Olsa wrote: > On Fri, Apr 24, 2015 at 10:29:46PM +0300, Adrian Hunter wrote: > > SNIP > >> --- a/tools/perf/util/auxtrace.c >> +++ b/tools/perf/util/auxtrace.c >> @@ -344,6 +344,33 @@ out_err: >> return err; >> } >> >> +static int auxtrace_queues__add_indexed_event(struct auxtrace_queues *queues, >> + struct perf_session *session, >> + off_t file_offset, size_t sz) >> +{ >> + union perf_event *event; >> + int err; >> + char buf[PERF_SAMPLE_MAX_SIZE]; >> + >> + err = perf_session__peek_event(session, file_offset, buf, >> + PERF_SAMPLE_MAX_SIZE, &event, NULL); >> + if (err) >> + return err; >> + >> + if (event->header.type == PERF_RECORD_AUXTRACE) { >> + if (event->header.size != sizeof(struct auxtrace_event) || >> + event->header.size != sz) { >> + err = -EINVAL; > > getting lost in here > > as per auxtrace_mmap__read it looks like we store PERF_RECORD_AUXTRACE event with: > ev.auxtrace.header.size = sizeof(ev.auxtrace); > > and it's followed with more data with size: > ev.auxtrace.size = size + padding; > > so why the check for 'event->header.size != sz' ? It checks the consistency of the file structure. But it seems to me that the previous check could be: event->header.size < sizeof(struct auxtrace_event) which would allow for the event being made bigger in a backward compatible way. > > jirka > >> + goto out; >> + } >> + file_offset += event->header.size; >> + err = auxtrace_queues__add_event(queues, session, event, >> + file_offset, NULL); >> + } >> +out: >> + return err; >> +} > > SNIP > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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