From patchwork Mon Aug 24 22:10:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Khazhy Kumykov X-Patchwork-Id: 11734431 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id ACF361575 for ; Mon, 24 Aug 2020 22:11:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8E7F520706 for ; Mon, 24 Aug 2020 22:11:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="EqHlX/qM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728001AbgHXWLR (ORCPT ); Mon, 24 Aug 2020 18:11:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726531AbgHXWLQ (ORCPT ); Mon, 24 Aug 2020 18:11:16 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF82DC061574 for ; Mon, 24 Aug 2020 15:11:15 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id g127so12309428ybf.11 for ; Mon, 24 Aug 2020 15:11:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:message-id:mime-version:subject:from:to:cc; bh=7libFXTeoVXtSxsZx4eAfjri3vn9ydzbEFYgezZigKg=; b=EqHlX/qMRMx/LOwfZ1t7WQK/nNN6yCRmIDpxachI3gcsZfP/KIGo3bOlFE9vp/zh+F tCOnzlWuSPyTdi1yDrB95sLgu3Iq5Jn55KtezGQ1Ar7Z/xzw1pqTLWmU2chqAKL1zR1K K86rsCcH4CvK90lNsaaLZok/HBhHi/fw3BLbprys2DBLQHMFaqQ7C4LDnTaaVpQYgk6h EVbC+8oLy3pOkK/AL3GTgSBMJZxGuJMS7rgzpqGUBu6za8FP0vaqa4KujiTQtGOCBLGP vVSmEqn+Jp8Sk6Wmz5vOk8u9PE9NGeTprgIlPEyyfJ4eGzQVOHes5tXsS27n9QGgwvZ0 I2EA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:message-id:mime-version:subject:from :to:cc; bh=7libFXTeoVXtSxsZx4eAfjri3vn9ydzbEFYgezZigKg=; b=JyML6Bn9OhG+cKjLx8OxgIrn2IDONps+pY0lyvJUtfIGmVSZxLukBZD6qn7tGYHLk/ BcgItOl7doram6gP4QqxElVilQiow5WwRZzq44IpQ4lbqwAekhQ3S+BXc+CENmzqWOHj Ybhtl2WWNg9xfLMRGKKR/oB/XdPdTM47PT9Fwa5bzfQJ4qHrXXA5iYkBb6NXe5a8HvrP BX2vmbEk19czqE5WcES/ctkvr16+bAHgcBtZydCAla8k4E5fjywo41unb0exDboQMefM u3tQGzf2OcPy7wiiiyU/L8E/e+ydd6wTcLBcla7HRpknDuIB3EgHM+uGlqb1BCQdyk3v sdQg== X-Gm-Message-State: AOAM532wd2MBjjgXvA7E4HMwIB8kmGYmvIiPbSmw8LJDbnWLrxtCaauU W6gBxUgvZPEsxRMxi2TcwVqlInPV1aM= X-Google-Smtp-Source: ABdhPJyYbIT3pRoEDWt2ng9koXX6AnueTSFvvd/SsxvbXJGSutYvdR3F5iCExJF30Lab3lVhBZgD2c8i/SU= X-Received: from khazhy-linux.svl.corp.google.com ([2620:15c:2cd:202:1ea0:b8ff:fe75:bae4]) (user=khazhy job=sendgmr) by 2002:a25:502:: with SMTP id 2mr10156615ybf.6.1598307075217; Mon, 24 Aug 2020 15:11:15 -0700 (PDT) Date: Mon, 24 Aug 2020 15:10:34 -0700 Message-Id: <20200824221034.2170308-1-khazhy@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.28.0.297.g1956fa8f8d-goog Subject: [PATCH v2] block: grant IOPRIO_CLASS_RT to CAP_SYS_NICE From: Khazhismel Kumykov To: Jens Axboe Cc: Serge Hallyn , Paolo Valente , Bart Van Assche , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, Khazhismel Kumykov Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: CAP_SYS_ADMIN is too broad, and ionice fits into CAP_SYS_NICE's grouping. Retain CAP_SYS_ADMIN permission for backwards compatibility. Signed-off-by: Khazhismel Kumykov Acked-by: Serge Hallyn Reviewed-by: Bart Van Assche --- block/ioprio.c | 2 +- include/uapi/linux/capability.h | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) v2: fix embarrassing logic mistake diff --git a/block/ioprio.c b/block/ioprio.c index 77bcab11dce5..276496246fe9 100644 --- a/block/ioprio.c +++ b/block/ioprio.c @@ -69,7 +69,7 @@ int ioprio_check_cap(int ioprio) switch (class) { case IOPRIO_CLASS_RT: - if (!capable(CAP_SYS_ADMIN)) + if (!capable(CAP_SYS_NICE) && !capable(CAP_SYS_ADMIN)) return -EPERM; /* fall through */ /* rt has prio field too */ diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h index 395dd0df8d08..c6ca33034147 100644 --- a/include/uapi/linux/capability.h +++ b/include/uapi/linux/capability.h @@ -288,6 +288,8 @@ struct vfs_ns_cap_data { processes and setting the scheduling algorithm used by another process. */ /* Allow setting cpu affinity on other processes */ +/* Allow setting realtime ioprio class */ +/* Allow setting ioprio class on other processes */ #define CAP_SYS_NICE 23