From patchwork Mon Jul 12 06:12:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 473777 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9BE6DC11F69 for ; Mon, 12 Jul 2021 07:32:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8809161621 for ; Mon, 12 Jul 2021 07:32:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245586AbhGLHfV (ORCPT ); Mon, 12 Jul 2021 03:35:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:42904 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345472AbhGLH3w (ORCPT ); Mon, 12 Jul 2021 03:29:52 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 41F1A61166; Mon, 12 Jul 2021 07:26:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626074809; bh=ESszSOxaOd3Rx8/NyECZ4eFeISMx95sBA1oNVh5cRAc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LBIhf5Od4YEH2YajHufqTPfTQhXniHCVvdSHEDrq9qUxBg6Zflz7deIPyKKpKppmm nHbyJ8oLFDErwkfNDz0S0Fy4OW0lUf1y88y+dwUCTMCKD3y4d0vhFjyDFZsbeJHH8v Qaav7J4F76kaYK36SKZNnrh+lrqElu4sHu9FUJ2g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thomas Gleixner , Dave Hansen , "Aneesh Kumar K.V" , Ram Pai , Sandipan Das , Florian Weimer , "Desnes A. Nunes do Rosario" , Ingo Molnar , Thiago Jung Bauermann , Michael Ellerman , Michal Hocko , Michal Suchanek , Shuah Khan , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH 5.12 676/700] selftests/vm/pkeys: handle negative sys_pkey_alloc() return code Date: Mon, 12 Jul 2021 08:12:39 +0200 Message-Id: <20210712061047.809507124@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060924.797321836@linuxfoundation.org> References: <20210712060924.797321836@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dave Hansen [ Upstream commit bf68294a2ec39ed7fec6a5b45d52034e6983157a ] The alloc_pkey() sefltest function wraps the sys_pkey_alloc() system call. On success, it updates its "shadow" register value because sys_pkey_alloc() updates the real register. But, the success check is wrong. pkey_alloc() considers any non-zero return code to indicate success where the pkey register will be modified. This fails to take negative return codes into account. Consider only a positive return value as a successful call. Link: https://lkml.kernel.org/r/20210611164157.87AB4246@viggo.jf.intel.com Fixes: 5f23f6d082a9 ("x86/pkeys: Add self-tests") Reported-by: Thomas Gleixner Signed-off-by: Dave Hansen Tested-by: Aneesh Kumar K.V Cc: Ram Pai Cc: Sandipan Das Cc: Florian Weimer Cc: "Desnes A. Nunes do Rosario" Cc: Ingo Molnar Cc: Thiago Jung Bauermann Cc: Michael Ellerman Cc: Michal Hocko Cc: Michal Suchanek Cc: Shuah Khan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- tools/testing/selftests/vm/protection_keys.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 9ee0ae5d3e06..356d62fca27f 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -510,7 +510,7 @@ int alloc_pkey(void) " shadow: 0x%016llx\n", __func__, __LINE__, ret, __read_pkey_reg(), shadow_pkey_reg); - if (ret) { + if (ret > 0) { /* clear both the bits: */ shadow_pkey_reg = set_pkey_bits(shadow_pkey_reg, ret, ~PKEY_MASK);