From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756863Ab1I2Wx7 (ORCPT ); Thu, 29 Sep 2011 18:53:59 -0400 Received: from casper.infradead.org ([85.118.1.10]:44111 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756182Ab1I2Wx6 (ORCPT ); Thu, 29 Sep 2011 18:53:58 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Jiri Olsa , David Ahern , Eric Dumazet , Ingo Molnar , Neil Horman , Paul Mackerras , Peter Zijlstra , Steven Rostedt , Arnaldo Carvalho de Melo Subject: [PATCH 1/1] perf tools: Fix raw sample reading Date: Thu, 29 Sep 2011 19:53:47 -0300 Message-Id: <1317336827-19810-2-git-send-email-acme@infradead.org> X-Mailer: git-send-email 1.6.2.5 In-Reply-To: <1317336827-19810-1-git-send-email-acme@infradead.org> References: <1317336827-19810-1-git-send-email-acme@infradead.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jiri Olsa Wrong pointer is being passed for raw data sanity checking, when parsing sample event. This ends up with invalid event and perf record being stuck in __perf_session__process_events function during processing build IDs (process_buildids function). Following command hangs up in my setup: ./perf record -e raw_syscalls:sys_enter ls The fix is to use proper pointer to the raw data instead of the 'u' union. Reviewed-by: David Ahern Cc: David Ahern Cc: Eric Dumazet Cc: Ingo Molnar Cc: Neil Horman Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Steven Rostedt Link: http://lkml.kernel.org/r/1317308709-9474-2-git-send-email-jolsa@redhat.com Signed-off-by: Jiri Olsa Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evsel.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index c5748c5..e389815 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -449,6 +449,8 @@ int perf_event__parse_sample(const union perf_event *event, u64 type, } if (type & PERF_SAMPLE_RAW) { + const u64 *pdata; + u.val64 = *array; if (WARN_ONCE(swapped, "Endianness of raw data not corrected!\n")) { @@ -462,11 +464,12 @@ int perf_event__parse_sample(const union perf_event *event, u64 type, return -EFAULT; data->raw_size = u.val32[0]; + pdata = (void *) array + sizeof(u32); - if (sample_overlap(event, &u.val32[1], data->raw_size)) + if (sample_overlap(event, pdata, data->raw_size)) return -EFAULT; - data->raw_data = &u.val32[1]; + data->raw_data = (void *) pdata; } return 0; -- 1.6.2.5