From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7033BC43381 for ; Wed, 27 Feb 2019 13:22:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2EA802133D for ; Wed, 27 Feb 2019 13:22:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730391AbfB0NWA (ORCPT ); Wed, 27 Feb 2019 08:22:00 -0500 Received: from mx1.redhat.com ([209.132.183.28]:59336 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726122AbfB0NV7 (ORCPT ); Wed, 27 Feb 2019 08:21:59 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 6C60A7F3F4; Wed, 27 Feb 2019 13:21:59 +0000 (UTC) Received: from krava (unknown [10.43.17.18]) by smtp.corp.redhat.com (Postfix) with SMTP id C84FA5DA9A; Wed, 27 Feb 2019 13:21:56 +0000 (UTC) Date: Wed, 27 Feb 2019 14:21:55 +0100 From: Jiri Olsa To: Song Liu Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, kernel-team@fb.com, peterz@infradead.org, acme@redhat.com, jolsa@kernel.org, namhyung@kernel.org Subject: Re: [PATCH v4 perf,bpf 07/15] perf, bpf: save bpf_prog_info information as headers to perf.data Message-ID: <20190227132155.GI18893@krava> References: <20190226002019.3748539-1-songliubraving@fb.com> <20190226002019.3748539-8-songliubraving@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190226002019.3748539-8-songliubraving@fb.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Wed, 27 Feb 2019 13:21:59 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 25, 2019 at 04:20:11PM -0800, Song Liu wrote: SNIP > + if (info_len > sizeof(struct bpf_prog_info)) { > + pr_warning("detected invalid bpf_prog_info\n"); > + goto out; > + } > + > + info_linear = malloc(sizeof(struct bpf_prog_info_linear) + > + data_len); > + if (!info_linear) > + goto out; > + info_linear->info_len = sizeof(struct bpf_prog_info); > + info_linear->data_len = data_len; > + if (do_read_u64(ff, (u64 *)(&info_linear->arrays))) > + goto out; > + if (__do_read(ff, &info_linear->info, info_len)) > + goto out; > + if (info_len < sizeof(struct bpf_prog_info)) > + memset(((void *)(&info_linear->info)) + info_len, 0, > + sizeof(struct bpf_prog_info) - info_len); > + > + if (__do_read(ff, info_linear->data, data_len)) > + goto out; > + > + /* endian mismatch, drop the info, continue */ so there's no way we can swap the data? why? jirka > + if (ff->ph->needs_swap) { > + free(info_linear); > + continue; > + } SNIP