From patchwork Tue Aug 23 22:09:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ian Rogers X-Patchwork-Id: 12952652 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6E6BC32772 for ; Tue, 23 Aug 2022 22:12:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230521AbiHWWM1 (ORCPT ); Tue, 23 Aug 2022 18:12:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232376AbiHWWLv (ORCPT ); Tue, 23 Aug 2022 18:11:51 -0400 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D8BF79A65 for ; Tue, 23 Aug 2022 15:10:59 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-335ff2ef600so261878237b3.18 for ; Tue, 23 Aug 2022 15:10:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc; bh=4qzUasdtAm954UzRSsL64Femn+0Nzy+IBuEBOWWP/QY=; b=cHl4Z24zLShIZ9jM6xvU6PSPFlPePPNxpwU4YRFMyapYLSTyVGWe71Y7pKHCcPQl1x pyTnHH4JPsyUpZ54JJZqo9/L4036WuYAsVKFAfKpuvGa7GGPGUdZfOYjjYhNeAaCecP4 NK01vFn/N/ddzeizyNoLb0fQ4qIksCWuO0WsVcKdX4QTtW+a2vuY9gngpBRhmu1KqcLB AwjgB9xmV3lUI+pMaAUrIoCWVhGHG8dGDALsTwdsAmeAA38XT3bpcWQuEgwPVYjEcDAr XtpzRoRhXRxJ3d8xW6+04dVtmdU16MhQm9t9447rT367gDkzrZJgxngzOfgV2Qx8DWbO tldQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc; bh=4qzUasdtAm954UzRSsL64Femn+0Nzy+IBuEBOWWP/QY=; b=VzEbCTj5iLvKTxBFw9oo2JmU/FxHWNpTr52T0q+EDGz3emzuF/m3kZ8f497ADwEMNo F4UXrZr6vfSEZOSAoN6hDRIsSQ249dtVXbOs0I+fDkzPqhMud1cNROfpIjlu6SGezH0P GU7rOs16MsoaFQnFgWEw+o3fQYPRmwVinHYsyVpze4KvMW8NBl/J6q6z2GG0BVlYi5yc DLsSVM/qmT6PpR4bTUKvcgmT8RvMO9JnEoe5VmdzKTof9Dm79/PsL+HtR2ZNOGwof8Yz Qe7wOT/0sCnSQ95CG6jmDyXmnwfvh1j/8ZoeHnLbJaaObhsE/UCUdtXu/BP9/s7+LkSz 3g0g== X-Gm-Message-State: ACgBeo0RxoszGjCga0Epf3DYeD2lYQG2pRBiI94KMHEUwSMxHKqYxXEW EeEa3aN+8Fq2KWqNveDQa5d0MQcJ6TFY X-Google-Smtp-Source: AA6agR6KpBoAko5h2ZEqfJEZD9u2QG5oKscnWYPYDk9FpYP+FjWPMVgX+tkWTtuFytTV74u4QuCbkG8atvo9 X-Received: from irogers.svl.corp.google.com ([2620:15c:2d4:203:7dbd:c08f:de81:c2a3]) (user=irogers job=sendgmr) by 2002:a0d:c9c3:0:b0:334:e708:7b05 with SMTP id l186-20020a0dc9c3000000b00334e7087b05mr28598701ywd.98.1661292658943; Tue, 23 Aug 2022 15:10:58 -0700 (PDT) Date: Tue, 23 Aug 2022 15:09:18 -0700 In-Reply-To: <20220823220922.256001-1-irogers@google.com> Message-Id: <20220823220922.256001-15-irogers@google.com> Mime-Version: 1.0 References: <20220823220922.256001-1-irogers@google.com> X-Mailer: git-send-email 2.37.2.609.g9ff673ca1a-goog Subject: [PATCH v2 14/18] perf dso: Hold lock when accessing nsinfo From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , Darren Hart , Davidlohr Bueso , " =?utf-8?q?Andr=C3=A9_Almeida?= " , Nathan Chancellor , Nick Desaulniers , Tom Rix , Weiguo Li , Athira Rajeev , Thomas Richter , Ravi Bangoria , Dario Petrillo , Hewenliang , yaowenbin , Wenyu Liu , Song Liu , Andrii Nakryiko , Dave Marchevsky , Leo Yan , Kim Phillips , Pavithra Gurushankar , Alexandre Truong , Quentin Monnet , William Cohen , Andres Freund , Adrian Hunter , " =?utf-8?q?Martin_Li=C5=A1ka?= " , Colin Ian King , James Clark , Fangrui Song , Stephane Eranian , Kajol Jain , Alexey Bayduraev , Riccardo Mancini , Andi Kleen , Masami Hiramatsu , Zechuan Chen , Jason Wang , Christophe JAILLET , Remi Bernon , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, bpf@vger.kernel.org, llvm@lists.linux.dev Cc: Ian Rogers Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org There may be threads racing to update dso->nsinfo: https://lore.kernel.org/linux-perf-users/CAP-5=fWZH20L4kv-BwVtGLwR=Em3AOOT+Q4QGivvQuYn5AsPRg@mail.gmail.com/ Holding the dso->lock avoids use-after-free, memory leaks and other such bugs. Apply the fix in: https://lore.kernel.org/linux-perf-users/20211118193714.2293728-1-irogers@google.com/ of there being a missing nsinfo__put now that the accesses are data race free. Fixes test "Lookup mmap thread" when compiled with address sanitizer. Signed-off-by: Ian Rogers --- tools/perf/builtin-inject.c | 4 ++++ tools/perf/util/annotate.c | 2 ++ tools/perf/util/build-id.c | 12 +++++++++--- tools/perf/util/dso.c | 7 ++++++- tools/perf/util/map.c | 3 +++ tools/perf/util/probe-event.c | 3 +++ tools/perf/util/symbol.c | 2 +- 7 files changed, 28 insertions(+), 5 deletions(-) diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 2a0f992ca0be..2a914eaf6425 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -433,8 +433,10 @@ static struct dso *findnew_dso(int pid, int tid, const char *filename, } if (dso) { + mutex_lock(&dso->lock); nsinfo__put(dso->nsinfo); dso->nsinfo = nsi; + mutex_unlock(&dso->lock); } else nsinfo__put(nsi); @@ -617,6 +619,7 @@ static int dso__read_build_id(struct dso *dso) if (dso->has_build_id) return 0; + mutex_lock(&dso->lock); nsinfo__mountns_enter(dso->nsinfo, &nsc); if (filename__read_build_id(dso->long_name, &dso->bid) > 0) dso->has_build_id = true; @@ -630,6 +633,7 @@ static int dso__read_build_id(struct dso *dso) free(new_name); } nsinfo__mountns_exit(&nsc); + mutex_unlock(&dso->lock); return dso->has_build_id ? 0 : -1; } diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c index 29d804d76145..1bbfbc8e1554 100644 --- a/tools/perf/util/annotate.c +++ b/tools/perf/util/annotate.c @@ -1697,6 +1697,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil */ __symbol__join_symfs(filename, filename_size, dso->long_name); + mutex_lock(&dso->lock); if (access(filename, R_OK) && errno == ENOENT && dso->nsinfo) { char *new_name = filename_with_chroot(dso->nsinfo->pid, filename); @@ -1705,6 +1706,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil free(new_name); } } + mutex_unlock(&dso->lock); } free(build_id_path); diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c index ec18ed5caf3e..a839b30c981b 100644 --- a/tools/perf/util/build-id.c +++ b/tools/perf/util/build-id.c @@ -898,11 +898,15 @@ static int filename__read_build_id_ns(const char *filename, static bool dso__build_id_mismatch(struct dso *dso, const char *name) { struct build_id bid; + bool ret = false; - if (filename__read_build_id_ns(name, &bid, dso->nsinfo) < 0) - return false; + mutex_lock(&dso->lock); + if (filename__read_build_id_ns(name, &bid, dso->nsinfo) >= 0) + ret = !dso__build_id_equal(dso, &bid); - return !dso__build_id_equal(dso, &bid); + mutex_unlock(&dso->lock); + + return ret; } static int dso__cache_build_id(struct dso *dso, struct machine *machine, @@ -941,8 +945,10 @@ static int dso__cache_build_id(struct dso *dso, struct machine *machine, if (!is_kallsyms && dso__build_id_mismatch(dso, name)) goto out_free; + mutex_lock(&dso->lock); ret = build_id_cache__add_b(&dso->bid, name, dso->nsinfo, is_kallsyms, is_vdso, proper_name, root_dir); + mutex_unlock(&dso->lock); out_free: free(allocated_name); return ret; diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index c7a5b42d1311..89e1b93cb874 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -501,6 +501,7 @@ static int __open_dso(struct dso *dso, struct machine *machine) if (!name) return -ENOMEM; + mutex_lock(&dso->lock); if (machine) root_dir = machine->root_dir; @@ -541,6 +542,7 @@ static int __open_dso(struct dso *dso, struct machine *machine) unlink(name); out: + mutex_unlock(&dso->lock); free(name); return fd; } @@ -559,8 +561,11 @@ static int open_dso(struct dso *dso, struct machine *machine) int fd; struct nscookie nsc; - if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE) + if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE) { + mutex_lock(&dso->lock); nsinfo__mountns_enter(dso->nsinfo, &nsc); + mutex_unlock(&dso->lock); + } fd = __open_dso(dso, machine); if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE) nsinfo__mountns_exit(&nsc); diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index e0aa4a254583..f3a3d9b3a40d 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -181,7 +181,10 @@ struct map *map__new(struct machine *machine, u64 start, u64 len, if (!(prot & PROT_EXEC)) dso__set_loaded(dso); } + mutex_lock(&dso->lock); + nsinfo__put(dso->nsinfo); dso->nsinfo = nsi; + mutex_unlock(&dso->lock); if (build_id__is_defined(bid)) { dso__set_build_id(dso, bid); diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 785246ff4179..0c24bc7afbca 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -29,6 +29,7 @@ #include "color.h" #include "map.h" #include "maps.h" +#include "mutex.h" #include "symbol.h" #include #include "trace-event.h" /* For __maybe_unused */ @@ -180,8 +181,10 @@ struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user) map = dso__new_map(target); if (map && map->dso) { + mutex_lock(&map->dso->lock); nsinfo__put(map->dso->nsinfo); map->dso->nsinfo = nsinfo__get(nsi); + mutex_unlock(&map->dso->lock); } return map; } else { diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 656d9b4dd456..a3a165ae933a 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1791,6 +1791,7 @@ int dso__load(struct dso *dso, struct map *map) char newmapname[PATH_MAX]; const char *map_path = dso->long_name; + mutex_lock(&dso->lock); perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0; if (perfmap) { if (dso->nsinfo && (dso__find_perf_map(newmapname, @@ -1800,7 +1801,6 @@ int dso__load(struct dso *dso, struct map *map) } nsinfo__mountns_enter(dso->nsinfo, &nsc); - mutex_lock(&dso->lock); /* check again under the dso->lock */ if (dso__loaded(dso)) {