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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5EE3BC4321E for ; Sun, 4 Dec 2022 07:31:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p1jSl-0000vD-M6; Sun, 04 Dec 2022 02:30:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p1jSj-0000ui-Q6 for qemu-devel@nongnu.org; Sun, 04 Dec 2022 02:30:57 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p1jSh-0001ez-IR for qemu-devel@nongnu.org; Sun, 04 Dec 2022 02:30:56 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670139054; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+GGWO6+QgQg0ZE+z7jUcy+b6u/rTo8l/F93cQ8iDFMo=; b=Vu0oB7i0F6MpKiddQ0xlYAMgiVal3ao8wfdTaXoSMgB0xd7eKJMKS3KPbZ30XW+lsp9Vft YsOuHIjOql5nvK/Q+d4o+9Tq1a6ES9nQQcKqB92Q4RbbghFZ8kW0yBc6A9aG+sA9GwSE03 VvI/XJ05EKSefZJdVgU+ByEqtE+s17E= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-615-jmfI9Q4UPsWq7dnvI1Ut2Q-1; Sun, 04 Dec 2022 02:30:52 -0500 X-MC-Unique: jmfI9Q4UPsWq7dnvI1Ut2Q-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 86449101A52A for ; Sun, 4 Dec 2022 07:30:52 +0000 (UTC) Received: from thuth.com (unknown [10.39.192.38]) by smtp.corp.redhat.com (Postfix) with ESMTP id B159F2166B29; Sun, 4 Dec 2022 07:30:51 +0000 (UTC) From: Thomas Huth To: Stefan Hajnoczi , qemu-devel@nongnu.org Subject: [PULL 2/3] target/s390x/tcg: Fix and improve the SACF instruction Date: Sun, 4 Dec 2022 08:30:42 +0100 Message-Id: <20221204073043.54402-3-thuth@redhat.com> In-Reply-To: <20221204073043.54402-1-thuth@redhat.com> References: <20221204073043.54402-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The SET ADDRESS SPACE CONTROL FAST instruction is not privileged, it can be used from problem space, too. Just the switching to the home address space is privileged and should still generate a privilege exception. This bug is e.g. causing programs like Java that use the "getcpu" vdso kernel function to crash (see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=990417#26 ). While we're at it, also check if DAT is not enabled. In that case the instruction is supposed to generate a special operation exception. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/655 Message-Id: <20221201184443.136355-1-thuth@redhat.com> Reviewed-by: Ilya Leoshkevich Reviewed-by: David Hildenbrand Reviewed-by: Richard Henderson Signed-off-by: Thomas Huth --- target/s390x/tcg/insn-data.h.inc | 2 +- target/s390x/tcg/cc_helper.c | 7 +++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/target/s390x/tcg/insn-data.h.inc b/target/s390x/tcg/insn-data.h.inc index 7e952bdfc8..54d4250c9f 100644 --- a/target/s390x/tcg/insn-data.h.inc +++ b/target/s390x/tcg/insn-data.h.inc @@ -1365,7 +1365,7 @@ /* SERVICE CALL LOGICAL PROCESSOR (PV hypercall) */ F(0xb220, SERVC, RRE, Z, r1_o, r2_o, 0, 0, servc, 0, IF_PRIV | IF_IO) /* SET ADDRESS SPACE CONTROL FAST */ - F(0xb279, SACF, S, Z, 0, a2, 0, 0, sacf, 0, IF_PRIV) + C(0xb279, SACF, S, Z, 0, a2, 0, 0, sacf, 0) /* SET CLOCK */ F(0xb204, SCK, S, Z, 0, m2_64a, 0, 0, sck, 0, IF_PRIV | IF_IO) /* SET CLOCK COMPARATOR */ diff --git a/target/s390x/tcg/cc_helper.c b/target/s390x/tcg/cc_helper.c index b2e8d3d9f5..b36f8cdc8b 100644 --- a/target/s390x/tcg/cc_helper.c +++ b/target/s390x/tcg/cc_helper.c @@ -487,6 +487,10 @@ void HELPER(sacf)(CPUS390XState *env, uint64_t a1) { HELPER_LOG("%s: %16" PRIx64 "\n", __func__, a1); + if (!(env->psw.mask & PSW_MASK_DAT)) { + tcg_s390_program_interrupt(env, PGM_SPECIAL_OP, GETPC()); + } + switch (a1 & 0xf00) { case 0x000: env->psw.mask &= ~PSW_MASK_ASC; @@ -497,6 +501,9 @@ void HELPER(sacf)(CPUS390XState *env, uint64_t a1) env->psw.mask |= PSW_ASC_SECONDARY; break; case 0x300: + if ((env->psw.mask & PSW_MASK_PSTATE) != 0) { + tcg_s390_program_interrupt(env, PGM_PRIVILEGED, GETPC()); + } env->psw.mask &= ~PSW_MASK_ASC; env->psw.mask |= PSW_ASC_HOME; break; -- 2.31.1