From nobody Fri Jan 2 01:46:16 2026 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 E9583CDB482 for ; Tue, 17 Oct 2023 20:25:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344511AbjJQUZu (ORCPT ); Tue, 17 Oct 2023 16:25:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344414AbjJQUZf (ORCPT ); Tue, 17 Oct 2023 16:25:35 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BEB9DF1; Tue, 17 Oct 2023 13:25:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1697574334; x=1729110334; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=J1x07zCPUyPDNEiTVhjwVyzpDF64pQWTC5hwW7cc64I=; b=JPwgOfLZ9GdBCkxOf6zyBuHh9bI/hzxijRF9qCVbj79tO1Zq44WeMtrc MB/3ZrdSEl7aDYrISHf1zWT+trYgMeSvGUhd3EmtX+1iyY8S8zoStLkdF WyBDviZUTokGKjcIMCI3du5Mrdo//UW0z4lYWBPvg+hfjP+n+CpM+1vkU RIH/5wvTi8LJrNWGx1GRM/ry5ifWnZf3ZQcGK4AIG+ZW/65aBstNHhCAc jaFpwg5bLUyN4gclLtuoneLZMALDO7KgBLHaWGAwOqUBMG5PJIE5FBxXp uKSaY/JTk8tfpscskWMc4mQowRmLQJU9hmha441tnfWOXzGvB8ep4lutJ w==; X-IronPort-AV: E=McAfee;i="6600,9927,10866"; a="7429543" X-IronPort-AV: E=Sophos;i="6.03,233,1694761200"; d="scan'208";a="7429543" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2023 13:25:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10866"; a="900040454" X-IronPort-AV: E=Sophos;i="6.03,233,1694761200"; d="scan'208";a="900040454" Received: from rtdinh-mobl1.amr.corp.intel.com (HELO rpedgeco-desk4.intel.com) ([10.212.150.155]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2023 13:23:30 -0700 From: Rick Edgecombe To: x86@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, luto@kernel.org, peterz@infradead.org, kirill.shutemov@linux.intel.com, elena.reshetova@intel.com, isaku.yamahata@intel.com, seanjc@google.com, Michael Kelley , thomas.lendacky@amd.com, decui@microsoft.com, sathyanarayanan.kuppuswamy@linux.intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: rick.p.edgecombe@intel.com, Richard Cochran , netdev@vger.kernel.org Subject: [PATCH 05/10] ptp: Use free_decrypted_pages() Date: Tue, 17 Oct 2023 13:25:00 -0700 Message-Id: <20231017202505.340906-6-rick.p.edgecombe@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231017202505.340906-1-rick.p.edgecombe@intel.com> References: <20231017202505.340906-1-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" On TDX it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. Ptp could free decrypted/shared pages if set_memory_decrypted() fails. Use the recently added free_decrypted_pages() to avoid this. Cc: Richard Cochran Cc: netdev@vger.kernel.org Signed-off-by: Rick Edgecombe --- drivers/ptp/ptp_kvm_x86.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/ptp/ptp_kvm_x86.c b/drivers/ptp/ptp_kvm_x86.c index 902844cc1a17..203af060013d 100644 --- a/drivers/ptp/ptp_kvm_x86.c +++ b/drivers/ptp/ptp_kvm_x86.c @@ -36,7 +36,7 @@ int kvm_arch_ptp_init(void) clock_pair =3D page_address(p); ret =3D set_memory_decrypted((unsigned long)clock_pair, 1); if (ret) { - __free_page(p); + free_decrypted_pages((unsigned long)clock_pair, 0); clock_pair =3D NULL; goto nofree; } --=20 2.34.1