From patchwork Mon Nov 1 06:04:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 12595875 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2496C4321E for ; Mon, 1 Nov 2021 06:05:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E9E3460EBC for ; Mon, 1 Nov 2021 06:05:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231768AbhKAGH7 (ORCPT ); Mon, 1 Nov 2021 02:07:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231393AbhKAGHe (ORCPT ); Mon, 1 Nov 2021 02:07:34 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E1E7C06120C; Sun, 31 Oct 2021 23:04:46 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id k4so1069630plx.8; Sun, 31 Oct 2021 23:04:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=UnbvpW9WGZPPHsD461H5NLpgI+BcZRpk9Uvkg/7/FsI=; b=mBgEqR2cuqWgG4wbE+Ee9nl7PI0oPuF//CHOFEk3rqDKH5Wv+2P8q+SgcLACl7Eu1S DYIBVewqg0Hdo0Z9cjB8Sc4otEiDDpzHVGJDzdQm/23So6LaXX9kNiFXBxpugZ7V+xVS 0csKWuVOGikNjqyzPgk+VenqX+qZTV7bDJrecXDWyeYudRBWBkdXOMGaT3EtG6yamLnt oT+8TiedZHp3qG2ml51vaYf8orZUmG0H45pcDpUssVRSPBh7l6VY8IyPdChDJul82kv5 Ev7EY/jQQfLSgW8XNit4lnKgN4T8Rq4bUuBwJvyrwIhPyecKtKCfMJM4hdXsmzwSwxCL KqcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=UnbvpW9WGZPPHsD461H5NLpgI+BcZRpk9Uvkg/7/FsI=; b=X6fkjcpe6mzh8qOKc3DsZ7Cu7SMm9wxGkzruf7WvtS83k69P424BXLWq2/2HOp1y0f kSHXyOM/H5NtS7l/xvtBCYJ/zLFFuQeLp3y7wyOuf4vk4DjDwI69jahyyC9o5LDVvjgU NpD4Afvqw5KEG0Q/2LAHGugWO8XgAu4l6R4Z8yM3UpVEtvt8qkGrxnLxWoM6duT3/lo2 yFilMrXsUGXAGtyKd4GB8jIKTxHfQUo8UanW4mg/pbuzlKrlIgLnRc+iv4/Dk1n2y7N+ 353FKnIoJJ1Ete1q684kk0JqayGyUq3sqZ+c3t6BSfmewYQug+dix2zOuQ6buBu5GCXG XRPQ== X-Gm-Message-State: AOAM530TZMlNX+EOfKyPjS7WU8YfP2HK6fuO8TW/tcYaBsDUzlQ9OKmj e/hZ1GTahlL/P1iBDVZV66I= X-Google-Smtp-Source: ABdhPJzGCvt5iEpyM474KY6O62Zlsfcvpf7wrXcYqDsBGf7Az/ne89nFa22e0UxYm86jwgxdTn2BTA== X-Received: by 2002:a17:902:bd01:b0:141:6232:6f89 with SMTP id p1-20020a170902bd0100b0014162326f89mr23251730pls.12.1635746685828; Sun, 31 Oct 2021 23:04:45 -0700 (PDT) Received: from localhost.localdomain ([144.202.123.152]) by smtp.gmail.com with ESMTPSA id g8sm3277586pfc.65.2021.10.31.23.04.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 31 Oct 2021 23:04:45 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org, keescook@chromium.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, arnaldo.melo@gmail.com, pmladek@suse.com, peterz@infradead.org, viro@zeniv.linux.org.uk, valentin.schneider@arm.com, qiang.zhang@windriver.com, robdclark@chromium.org, christian@brauner.io, dietmar.eggemann@arm.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, dennis.dalessandro@cornelisnetworks.com, mike.marciniszyn@cornelisnetworks.com, dledford@redhat.com, jgg@ziepe.ca Cc: linux-rdma@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, oliver.sang@intel.com, lkp@intel.com, Yafang Shao , Alexei Starovoitov , Andrii Nakryiko Subject: [PATCH v7 07/11] tools/bpf/bpftool/skeleton: make it adopt to task comm size change Date: Mon, 1 Nov 2021 06:04:15 +0000 Message-Id: <20211101060419.4682-8-laoar.shao@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211101060419.4682-1-laoar.shao@gmail.com> References: <20211101060419.4682-1-laoar.shao@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org bpf_probe_read_kernel_str() will add a nul terminator to the dst, then we don't care about if the dst size is big enough. Signed-off-by: Yafang Shao Cc: Mathieu Desnoyers Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Al Viro Cc: Kees Cook Cc: Petr Mladek Acked-by: Andrii Nakryiko --- tools/bpf/bpftool/skeleton/pid_iter.bpf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c index d9b420972934..f70702fcb224 100644 --- a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c +++ b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c @@ -71,8 +71,8 @@ int iter(struct bpf_iter__task_file *ctx) e.pid = task->tgid; e.id = get_obj_id(file->private_data, obj_type); - bpf_probe_read_kernel(&e.comm, sizeof(e.comm), - task->group_leader->comm); + bpf_probe_read_kernel_str(&e.comm, sizeof(e.comm), + task->group_leader->comm); bpf_seq_write(ctx->meta->seq, &e, sizeof(e)); return 0;