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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DA472C433F5 for ; Mon, 27 Dec 2021 15:52:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240009AbhL0PwG (ORCPT ); Mon, 27 Dec 2021 10:52:06 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:46066 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236444AbhL0Ppu (ORCPT ); Mon, 27 Dec 2021 10:45:50 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 57F79B810BF; Mon, 27 Dec 2021 15:45:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87052C36AEE; Mon, 27 Dec 2021 15:45:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1640619948; bh=yYLaS81s/3Fca2GhUspsFGbvMxax28YL/cDscsPIrBY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2XrhfBee/4IBAwXXs94zvGCSkoyDieflW0565ZAZjVRqwqPa0/ZPGKRzZFOOIGxkb Y96yNkQsjLUDi9auK9fqsJLTja2MQb9H2In5VSSKsC7KUWmRw66yYvzdyJEKQKCKTi 43uNN3JvxN3ufPPK/7RhupSznaOnAsFMu2ZYycFY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrew Cooper , Dave Hansen , Borislav Petkov Subject: [PATCH 5.15 083/128] x86/pkey: Fix undefined behaviour with PKRU_WD_BIT Date: Mon, 27 Dec 2021 16:30:58 +0100 Message-Id: <20211227151334.272749471@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211227151331.502501367@linuxfoundation.org> References: <20211227151331.502501367@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrew Cooper commit 57690554abe135fee81d6ac33cc94d75a7e224bb upstream. Both __pkru_allows_write() and arch_set_user_pkey_access() shift PKRU_WD_BIT (a signed constant) by up to 30 bits, hitting the sign bit. Use unsigned constants instead. Clearly pkey 15 has not been used in combination with UBSAN yet. Noticed by code inspection only. I can't actually provoke the compiler into generating incorrect logic as far as this shift is concerned. [ dhansen: add stable@ tag, plus minor changelog massaging, For anyone doing backports, these #defines were in arch/x86/include/asm/pgtable.h before 784a46618f6. ] Fixes: 33a709b25a76 ("mm/gup, x86/mm/pkeys: Check VMAs and PTEs for protection keys") Signed-off-by: Andrew Cooper Signed-off-by: Dave Hansen Signed-off-by: Borislav Petkov Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20211216000856.4480-1-andrew.cooper3@citrix.com Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/asm/pkru.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/x86/include/asm/pkru.h +++ b/arch/x86/include/asm/pkru.h @@ -4,8 +4,8 @@ #include -#define PKRU_AD_BIT 0x1 -#define PKRU_WD_BIT 0x2 +#define PKRU_AD_BIT 0x1u +#define PKRU_WD_BIT 0x2u #define PKRU_BITS_PER_PKEY 2 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS