From patchwork Mon Jun 13 19:44:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Topi Miettinen X-Patchwork-Id: 9174209 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 473786044F for ; Mon, 13 Jun 2016 19:48:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 379791FF12 for ; Mon, 13 Jun 2016 19:48:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2C44E22064; Mon, 13 Jun 2016 19:48:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E03161FF12 for ; Mon, 13 Jun 2016 19:48:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423978AbcFMTrN (ORCPT ); Mon, 13 Jun 2016 15:47:13 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:34175 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423368AbcFMTrF (ORCPT ); Mon, 13 Jun 2016 15:47:05 -0400 Received: by mail-wm0-f68.google.com with SMTP id n184so17321434wmn.1; Mon, 13 Jun 2016 12:47:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=hIdnm84IY5zPNrQrl+8MULgSVZBU20CNj64sh5wwlM4=; b=U9GBEASz089KAsOVJSVuhsjqaiNu2qZh4Umo0WW+cOcXbqO56Q7oVpMxsI2cIhL5fu j0aiV4rmE3DIX0Nul0DKgozhrIsihsgRakLRV0MO4m1zbdzhydp8H5njbJwqGT3P6q7w TdeojnUz9iLuiVga35gnizGRQ/YJ7fzCG0bInGCLuSPDH2uIY2hLLmeavr/WW/dL6Df9 NrazBJ1ZHWdxxufv83KEpsTrL0RI3sdT+8yMtyHnnt0uKk6e71raA0xbDyQ7BI5662JW mXm4alFp+Y0+xJCnsE0a9LSjYvaKvisVa/gEItJ8w4qgM1OiXxieIK/Dv8j6O3CBh1HZ ROpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=hIdnm84IY5zPNrQrl+8MULgSVZBU20CNj64sh5wwlM4=; b=WkE4PGE0r+cZdK9GYG7LacVNaJ0MIfxWalnVbtb+zFP+CR4U8YGxYIwVZWM+13MV0o MgQq/uhOLPJRThiYEkFdxHLB6WyJIZUcmCjNHJzRAdKw/qeyNcK36Axcun3P9CDKnDQ/ qTPq9vQGeOUZfrsl5tcN9ARYSghzJ5iRE1zYE855B3oQzkawnoyYPLnHc+z3eSN4uUIS gEyZRC/+jQHkVL4hOfmh6s3WgwpaXgwf5oZAb0KeM3288kMqz/ZYFrriPaIk8TW/MXZa dhZEopq0wKQnLglLH+Kw5BeDtX++7ufJ3XwPYiBKCxmRZ4vqDnqKVVh4ElaD+QWchw+Q /McA== X-Gm-Message-State: ALyK8tLU0W39i1xMwlZl2sfLaIl7B/YhNuN5PMZVx7Uxm3M9Zy68heBDAfaBeFvCy4yvdg== X-Received: by 10.194.79.168 with SMTP id k8mr2707487wjx.52.1465847224263; Mon, 13 Jun 2016 12:47:04 -0700 (PDT) Received: from localhost.localdomain ([2001:2003:f54a:b700:2ab2:bdff:fe10:799e]) by smtp.gmail.com with ESMTPSA id c9sm29135737wjh.49.2016.06.13.12.47.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 Jun 2016 12:47:03 -0700 (PDT) From: Topi Miettinen To: linux-kernel@vger.kernel.org Cc: Topi Miettinen , Alexander Viro , linux-fsdevel@vger.kernel.org (open list:FILESYSTEMS (VFS and infrastructure)) Subject: [RFC 09/18] limits: track RLIMIT_CORE actual max Date: Mon, 13 Jun 2016 22:44:16 +0300 Message-Id: <1465847065-3577-10-git-send-email-toiwoton@gmail.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1465847065-3577-1-git-send-email-toiwoton@gmail.com> References: <1465847065-3577-1-git-send-email-toiwoton@gmail.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Track maximum size of core dump written, presented in /proc/self/limits. Signed-off-by: Topi Miettinen --- fs/coredump.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/coredump.c b/fs/coredump.c index 281b768..abedc99 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -784,20 +784,25 @@ int dump_emit(struct coredump_params *cprm, const void *addr, int nr) struct file *file = cprm->file; loff_t pos = file->f_pos; ssize_t n; + int r = 0; + if (cprm->written + nr > cprm->limit) return 0; while (nr) { if (dump_interrupted()) - return 0; + goto err; n = __kernel_write(file, addr, nr, &pos); if (n <= 0) - return 0; + goto err; file->f_pos = pos; cprm->written += n; cprm->pos += n; nr -= n; } - return 1; + r = 1; + err: + bump_rlimit(RLIMIT_CORE, cprm->written); + return r; } EXPORT_SYMBOL(dump_emit);