From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753445AbeFERFy (ORCPT ); Tue, 5 Jun 2018 13:05:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:34934 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753383AbeFERFr (ORCPT ); Tue, 5 Jun 2018 13:05:47 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Ellerman Subject: [PATCH 4.9 35/61] powerpc/powernv: Set or clear security feature flags Date: Tue, 5 Jun 2018 19:01:56 +0200 Message-Id: <20180605170119.933550969@linuxfoundation.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180605170117.643936916@linuxfoundation.org> References: <20180605170117.643936916@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Ellerman commit 77addf6e95c8689e478d607176b399a6242a777e upstream. Now that we have feature flags for security related things, set or clear them based on what we see in the device tree provided by firmware. Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/platforms/powernv/setup.c | 56 +++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c @@ -37,9 +37,63 @@ #include #include #include +#include #include "powernv.h" + +static bool fw_feature_is(const char *state, const char *name, + struct device_node *fw_features) +{ + struct device_node *np; + bool rc = false; + + np = of_get_child_by_name(fw_features, name); + if (np) { + rc = of_property_read_bool(np, state); + of_node_put(np); + } + + return rc; +} + +static void init_fw_feat_flags(struct device_node *np) +{ + if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np)) + security_ftr_set(SEC_FTR_SPEC_BAR_ORI31); + + if (fw_feature_is("enabled", "fw-bcctrl-serialized", np)) + security_ftr_set(SEC_FTR_BCCTRL_SERIALISED); + + if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np)) + security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30); + + if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np)) + security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2); + + if (fw_feature_is("enabled", "fw-l1d-thread-split", np)) + security_ftr_set(SEC_FTR_L1D_THREAD_PRIV); + + if (fw_feature_is("enabled", "fw-count-cache-disabled", np)) + security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED); + + /* + * The features below are enabled by default, so we instead look to see + * if firmware has *disabled* them, and clear them if so. + */ + if (fw_feature_is("disabled", "speculation-policy-favor-security", np)) + security_ftr_clear(SEC_FTR_FAVOUR_SECURITY); + + if (fw_feature_is("disabled", "needs-l1d-flush-msr-pr-0-to-1", np)) + security_ftr_clear(SEC_FTR_L1D_FLUSH_PR); + + if (fw_feature_is("disabled", "needs-l1d-flush-msr-hv-1-to-0", np)) + security_ftr_clear(SEC_FTR_L1D_FLUSH_HV); + + if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np)) + security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR); +} + static void pnv_setup_rfi_flush(void) { struct device_node *np, *fw_features; @@ -55,6 +109,8 @@ static void pnv_setup_rfi_flush(void) of_node_put(np); if (fw_features) { + init_fw_feat_flags(fw_features); + np = of_get_child_by_name(fw_features, "inst-l1d-flush-trig2"); if (np && of_property_read_bool(np, "enabled")) type = L1D_FLUSH_MTTRIG;