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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19AB5C433EF for ; Tue, 9 Nov 2021 01:36:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E0690610A8 for ; Tue, 9 Nov 2021 01:36:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241515AbhKIBi6 (ORCPT ); Mon, 8 Nov 2021 20:38:58 -0500 Received: from mga05.intel.com ([192.55.52.43]:9905 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243315AbhKIBi0 (ORCPT ); Mon, 8 Nov 2021 20:38:26 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10162"; a="318555845" X-IronPort-AV: E=Sophos;i="5.87,218,1631602800"; d="scan'208";a="318555845" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Nov 2021 17:28:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,218,1631602800"; d="scan'208";a="641693043" Received: from chang-linux-3.sc.intel.com ([172.25.66.175]) by fmsmga001.fm.intel.com with ESMTP; 08 Nov 2021 17:28:21 -0800 From: "Chang S. Bae" To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, tglx@linutronix.de, dave.hansen@linux.intel.com, bp@alien8.de, mingo@redhat.com, yang.zhong@intel.com, jing2.liu@intel.com, chang.seok.bae@intel.com Subject: [PATCH v2 1/2] x86/arch_prctl: Fix the ARCH_REQ_XCOMP_PERM implementation Date: Mon, 8 Nov 2021 17:21:21 -0800 Message-Id: <20211109012122.1142-2-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211109012122.1142-1-chang.seok.bae@intel.com> References: <20211109012122.1142-1-chang.seok.bae@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ARCH_REQ_XCOMP_PERM is supposed to add the requested feature to the permission bitmap of thread_group_leader()->fpu. But the code overwrites the bitmap with the requested feature bit only rather than adding it. Fix the code to add the request feature bit to the master bitmask. Reported-by: Yang Zhong Fixes: db8268df0983 ("x86/arch_prctl: Add controls for dynamic XSTATE components") Signed-off-by: Chang S. Bae Cc: Thomas Gleixner Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org --- Changes from v1: * Change the mask value only and trim the changelog. --- arch/x86/kernel/fpu/xstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index d28829403ed0..fc1ab0116f4e 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -1626,7 +1626,7 @@ static int __xstate_request_perm(u64 permitted, u64 requested) return ret; /* Pairs with the READ_ONCE() in xstate_get_group_perm() */ - WRITE_ONCE(fpu->perm.__state_perm, requested); + WRITE_ONCE(fpu->perm.__state_perm, mask); /* Protected by sighand lock */ fpu->perm.__state_size = ksize; fpu->perm.__user_state_size = usize; -- 2.17.1