From patchwork Wed Dec 29 16:57:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Fabiano Rosas X-Patchwork-Id: 1573987 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=bQWJKqK9; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) 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 bilbo.ozlabs.org (Postfix) with ESMTPS id 4JPHn33R6cz9sPC for ; Thu, 30 Dec 2021 04:04:07 +1100 (AEDT) Received: from localhost ([::1]:39926 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n2cMv-00014J-AM for incoming@patchwork.ozlabs.org; Wed, 29 Dec 2021 12:04:05 -0500 Received: from eggs.gnu.org ([209.51.188.92]:42768) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n2cHR-0003sV-SU; Wed, 29 Dec 2021 11:58:26 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:39452) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n2cHM-000472-CD; Wed, 29 Dec 2021 11:58:25 -0500 Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1BTEjQ2O021992; Wed, 29 Dec 2021 16:58:07 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=i3kgBymahYCbAL10VjwHG+xpSV7Y4ch3uriY8EAqRbE=; b=bQWJKqK9nK3EfS4cxBzvqyiX/zsov40/VeTRmd+D7poi0LNLbKtmwsuoRugbCdZcqblJ LS2237ZeeD3MLvv+8AZzYo1HUtEW5EreLYaFcdkKSls4dP+SiYkmpZEsDcJ5YI7niRL0 z+7o7YN3cECU/a9m4cC/fzmYF1wuIIcXeBMdEUPc6kSiPzF7MxAZww5kSgohN1AcP8SK oOvJ6j5P8yv56WGf1KP80YqXbAKYdyuFmkxvFO7LC1K55fV5yZ/UzVox3I2IS1Z2IQK0 GDI7enoL5rk/joc4cefG6yULmBJYOb5bDJEdO0yScDAZx81bOogKh+wu0m5AXYLbvrFE aA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3d7yr0es5n-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 29 Dec 2021 16:58:07 +0000 Received: from m0187473.ppops.net (m0187473.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1BTGipOs029689; Wed, 29 Dec 2021 16:58:07 GMT Received: from ppma01dal.us.ibm.com (83.d6.3fa9.ip4.static.sl-reverse.com [169.63.214.131]) by mx0a-001b2d01.pphosted.com with ESMTP id 3d7yr0es5c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 29 Dec 2021 16:58:07 +0000 Received: from pps.filterd (ppma01dal.us.ibm.com [127.0.0.1]) by ppma01dal.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1BTGuuN1029283; Wed, 29 Dec 2021 16:58:05 GMT Received: from b01cxnp22033.gho.pok.ibm.com (b01cxnp22033.gho.pok.ibm.com [9.57.198.23]) by ppma01dal.us.ibm.com with ESMTP id 3d5txc3fv1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 29 Dec 2021 16:58:05 +0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1BTGw46427656490 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 29 Dec 2021 16:58:04 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D7951AC059; Wed, 29 Dec 2021 16:58:04 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7FA63AC05B; Wed, 29 Dec 2021 16:58:02 +0000 (GMT) Received: from farosas.linux.ibm.com.com (unknown [9.211.90.107]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 29 Dec 2021 16:58:02 +0000 (GMT) From: Fabiano Rosas To: qemu-devel@nongnu.org Subject: [PATCH v2 2/5] target/ppc: powerpc_excp: Add excp_vectors bounds check Date: Wed, 29 Dec 2021 13:57:48 -0300 Message-Id: <20211229165751.3774248-3-farosas@linux.ibm.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211229165751.3774248-1-farosas@linux.ibm.com> References: <20211229165751.3774248-1-farosas@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: LLe03oozYwccsyxRmuG82uHRPbnFEDPR X-Proofpoint-ORIG-GUID: HNiJAXWxjMhBYL353K9xVAwHDaHifrnD X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-29_06,2021-12-29_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxscore=0 priorityscore=1501 phishscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 impostorscore=0 spamscore=0 malwarescore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112290088 Received-SPF: pass client-ip=148.163.156.1; envelope-from=farosas@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: 0 X-Spam_score: -0.1 X-Spam_bar: / X-Spam_report: (-0.1 / 5.0 requ) DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-ppc@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: richard.henderson@linaro.org, danielhb413@gmail.com, qemu-ppc@nongnu.org, clg@kaod.org, david@gibson.dropbear.id.au Errors-To: qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-ppc" The next patch will start accessing the excp_vectors array earlier in the function, so add a bounds check as first thing here. This converts the empty return on POWERPC_EXCP_NONE to an error. This exception number never reaches this function and if it does it probably means something else went wrong up the line. Signed-off-by: Fabiano Rosas Reviewed-by: Richard Henderson Reviewed-by: Cédric Le Goater Reviewed-by: David Gibson --- target/ppc/excp_helper.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index 8b9c6bc5a8..9a03e4b896 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -300,6 +300,10 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) target_ulong msr, new_msr, vector; int srr0, srr1, lev = -1; + if (excp <= POWERPC_EXCP_NONE || excp >= POWERPC_EXCP_NB) { + cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp); + } + qemu_log_mask(CPU_LOG_INT, "Raise exception at " TARGET_FMT_lx " => %08x (%02x)\n", env->nip, excp, env->error_code); @@ -353,9 +357,6 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp) #endif switch (excp) { - case POWERPC_EXCP_NONE: - /* Should never happen */ - return; case POWERPC_EXCP_CRITICAL: /* Critical input */ switch (excp_model) { case POWERPC_EXCP_40x: