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 X-Spam-Level: X-Spam-Status: No, score=-14.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 A05C0C3A59C for ; Fri, 16 Aug 2019 14:32:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7DE692171F for ; Fri, 16 Aug 2019 14:32:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727503AbfHPOcE (ORCPT ); Fri, 16 Aug 2019 10:32:04 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:11212 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727245AbfHPOcD (ORCPT ); Fri, 16 Aug 2019 10:32:03 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x7GEUQFW046935; Fri, 16 Aug 2019 10:31:10 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 2udx190u1s-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Aug 2019 10:31:10 -0400 Received: from m0098420.ppops.net (m0098420.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.27/8.16.0.27) with SMTP id x7GEUaMi047879; Fri, 16 Aug 2019 10:31:10 -0400 Received: from ppma02wdc.us.ibm.com (aa.5b.37a9.ip4.static.sl-reverse.com [169.55.91.170]) by mx0b-001b2d01.pphosted.com with ESMTP id 2udx190u16-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Aug 2019 10:31:10 -0400 Received: from pps.filterd (ppma02wdc.us.ibm.com [127.0.0.1]) by ppma02wdc.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id x7GEUPFY015415; Fri, 16 Aug 2019 14:31:09 GMT Received: from b03cxnp08027.gho.boulder.ibm.com (b03cxnp08027.gho.boulder.ibm.com [9.17.130.19]) by ppma02wdc.us.ibm.com with ESMTP id 2u9nj66bq8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Aug 2019 14:31:09 +0000 Received: from b03ledav005.gho.boulder.ibm.com (b03ledav005.gho.boulder.ibm.com [9.17.130.236]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x7GEV7in58392940 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Aug 2019 14:31:07 GMT Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 02BFBBE056; Fri, 16 Aug 2019 14:31:07 +0000 (GMT) Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 781A9BE081; Fri, 16 Aug 2019 14:31:06 +0000 (GMT) Received: from localhost (unknown [9.85.178.67]) by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 16 Aug 2019 14:31:06 +0000 (GMT) From: Gustavo Walbon To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au Cc: diana.craciun@nxp.com, tglx@linutronix.de, jkosina@suse.cz, mikey@neuling.org, jpoimboe@redhat.com, leitao@debian.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, gustavowalbon@gmail.com Subject: [PATCH] powerpc: Set right value of Speculation_Store_Bypass in /proc//status Date: Fri, 16 Aug 2019 11:30:48 -0300 Message-Id: <20190816143048.11458-1-gwalbon@linux.ibm.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-08-16_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908160152 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The issue has showed the value of status of Speculation_Store_Bypass in the /proc//status as `unknown` for PowerPC systems. The patch fix the checking of the mitigation status of Speculation, and can be reported as "not vulnerable", "globally mitigated" or "vulnerable". Link: https://github.com/linuxppc/issues/issues/255 Signed-off-by: Gustavo Walbon --- arch/powerpc/kernel/security.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c index e1c9cf079503..754ae4238d4e 100644 --- a/arch/powerpc/kernel/security.c +++ b/arch/powerpc/kernel/security.c @@ -14,7 +14,7 @@ #include #include #include - +#include unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT; @@ -339,6 +339,29 @@ ssize_t cpu_show_spec_store_bypass(struct device *dev, struct device_attribute * return sprintf(buf, "Vulnerable\n"); } +static int ssb_prctl_get(struct task_struct *task) +{ + if (stf_barrier) { + if (stf_enabled_flush_types == STF_BARRIER_NONE) + return PR_SPEC_NOT_AFFECTED; + else + return PR_SPEC_DISABLE; + } else + return PR_SPEC_DISABLE_NOEXEC; + + return -EINVAL; +} + +int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which) +{ + switch (which) { + case PR_SPEC_STORE_BYPASS: + return ssb_prctl_get(task); + default: + return -ENODEV; + } +} + #ifdef CONFIG_DEBUG_FS static int stf_barrier_set(void *data, u64 val) { -- 2.19.1