Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932335AbaJNTE0 (ORCPT ); Tue, 14 Oct 2014 15:04:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:27023 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753601AbaJNTEZ (ORCPT ); Tue, 14 Oct 2014 15:04:25 -0400 Date: Tue, 14 Oct 2014 16:04:20 -0300 From: Arnaldo Carvalho de Melo To: Namhyung Kim Cc: Stephane Eranian , linux-kernel@vger.kernel.org, jolsa@redhat.com, peterz@infradead.org, mingo@kernel.org, dsahern@gmail.com, acme@kernel.org Subject: Re: [PATCH v2] perf tools: fix off-by-one error in maps Message-ID: <20141014190420.GB3839@redhat.com> References: <20141006083532.GA4850@quad> <8761fwh1nc.fsf@sejong.aot.lge.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8761fwh1nc.fsf@sejong.aot.lge.com> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.20 (2009-12-10) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Tue, Oct 07, 2014 at 02:47:19PM +0900, Namhyung Kim escreveu: > Hi Stephane, > > On Mon, 6 Oct 2014 10:35:32 +0200, Stephane Eranian wrote: > > This patch fixes off-by-one errors in the management of maps. > > A map is defined by start address and length as implemented by map__new(): > > > > map__init(map, type, start, start + len, pgoff, dso); > > > > map->start = addr; > > map->end = end; > > > > Consequently, the actual address range is ]start; end[ > > map->end is the first byte outside the range. This patch > > fixes two bugs where upper bound checking was off-by-one. > > > > In V2, we fix map_groups__fixup_overlappings() some more > > where map->start was off-by-one as reported by Jiri. > >> It seems we also need to fix maps__find(): So I am getting this as an ack for Stephane's V2 patch and the patch below as an extra patch, from you, acked by Stephane. - Arnaldo > > diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c > index b7090596ac50..107a8c90785b 100644 > --- a/tools/perf/util/map.c > +++ b/tools/perf/util/map.c > @@ -752,7 +752,7 @@ struct map *maps__find(struct rb_root *maps, u64 ip) > m = rb_entry(parent, struct map, rb_node); > if (ip < m->start) > p = &(*p)->rb_left; > - else if (ip > m->end) > + else if (ip >= m->end) > p = &(*p)->rb_right; > else > return m; > > Thanks, > Namhyung > > > > > > Signed-off-by: Stephane Eranian > > --- > > tools/perf/util/map.c | 6 +++--- > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c > > index b709059..186418b 100644 > > --- a/tools/perf/util/map.c > > +++ b/tools/perf/util/map.c > > @@ -556,7 +556,7 @@ struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg, > > > > int map_groups__find_ams(struct addr_map_symbol *ams, symbol_filter_t filter) > > { > > - if (ams->addr < ams->map->start || ams->addr > ams->map->end) { > > + if (ams->addr < ams->map->start || ams->addr >= ams->map->end) { > > if (ams->map->groups == NULL) > > return -1; > > ams->map = map_groups__find(ams->map->groups, ams->map->type, > > @@ -664,7 +664,7 @@ int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map, > > goto move_map; > > } > > > > - before->end = map->start - 1; > > + before->end = map->start; > > map_groups__insert(mg, before); > > if (verbose >= 2) > > map__fprintf(before, fp); > > @@ -678,7 +678,7 @@ int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map, > > goto move_map; > > } > > > > - after->start = map->end + 1; > > + after->start = map->end; > > map_groups__insert(mg, after); > > if (verbose >= 2) > > map__fprintf(after, fp); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/