From nobody Tue Nov 11 17:33:23 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1565332910; cv=none; d=zoho.com; s=zohoarc; b=Ruq0+txOu75hwti4LFkxgpjp+ceCsjP8N+1mgREBpV1DwEL+AUl8+j7i76aPnpQMCU0+3YjZMpdivUztYHiXHhatfr5KoM2fnq2nLzlnxtHpBim75t6QUdRE/o9+0nJXflgYb0lRQXeQgw0M6Jv5BPIvxDjOLg9o2nBfbL1YohI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1565332910; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=/RYW4exGFErnqfUaoD+PTKKSjvhCqrpzMHkaqeTXfjo=; b=QKh7ZwLTyIhJf/WH/BUpE04XlB3ViXpRcgYKIpAGHKEmVJiNoEgciJOt7OUXsouyzgVMKXKTUlrRm6JVpAvdd+6cadJz66r24kxzmmTfWts99fV3TkKrGRExlarTeeY3bmg7rHbQmo6cXJ9/UThhCRkxuG4SmTEDsNLe4vPthSE= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1565332910955145.7678912318671; Thu, 8 Aug 2019 23:41:50 -0700 (PDT) Received: from localhost ([::1]:56656 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hvyaw-0005C4-RL for importer@patchew.org; Fri, 09 Aug 2019 02:41:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46809) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hvya3-0004Gu-VC for qemu-devel@nongnu.org; Fri, 09 Aug 2019 02:40:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hvya2-0006kf-Iv for qemu-devel@nongnu.org; Fri, 09 Aug 2019 02:40:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43060) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hvya2-0006jy-De for qemu-devel@nongnu.org; Fri, 09 Aug 2019 02:40:50 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B6916300BEAC; Fri, 9 Aug 2019 06:40:49 +0000 (UTC) Received: from localhost.localdomain (unknown [10.74.10.36]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D045019C70; Fri, 9 Aug 2019 06:40:45 +0000 (UTC) From: P J P To: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Fri, 9 Aug 2019 12:08:34 +0530 Message-Id: <20190809063835.6717-2-ppandit@redhat.com> In-Reply-To: <20190809063835.6717-1-ppandit@redhat.com> References: <20190809063835.6717-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Fri, 09 Aug 2019 06:40:49 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v3 1/2] scsi: lsi: exit infinite loop while executing script (CVE-2019-12068) X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Prasad J Pandit , Marcelo Tosatti , Mark Cave-Ayland , QEMU Developers , Bugs SysSec , Paolo Bonzini , Stefano Garzarella Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Prasad J Pandit When executing script in lsi_execute_script(), the LSI scsi adapter emulator advances 's->dsp' index to read next opcode. This can lead to an infinite loop if the next opcode is empty. Exit such loop after reading 10k empty opcodes. Reported-by: Bugs SysSec Signed-off-by: Prasad J Pandit --- hw/scsi/lsi53c895a.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) Update v3: raise an illegal instruction interrupt and exit -> https://lists.gnu.org/archive/html/qemu-devel/2019-08/msg01427.html diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index 10468c1ec1..e703ef4c9d 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -185,6 +185,9 @@ static const char *names[] =3D { /* Flag set if this is a tagged command. */ #define LSI_TAG_VALID (1 << 16) =20 +/* Maximum instructions to process. */ +#define LSI_MAX_INSN 10000 + typedef struct lsi_request { SCSIRequest *req; uint32_t tag; @@ -1132,7 +1135,13 @@ static void lsi_execute_script(LSIState *s) =20 s->istat1 |=3D LSI_ISTAT1_SRUN; again: - insn_processed++; + if (++insn_processed > LSI_MAX_INSN) { + trace_lsi_execute_script_tc_illegal(); + lsi_script_dma_interrupt(s, LSI_DSTAT_IID); + lsi_disconnect(s); + trace_lsi_execute_script_stop(); + return; + } insn =3D read_dword(s, s->dsp); if (!insn) { /* If we receive an empty opcode increment the DSP by 4 bytes --=20 2.21.0 From nobody Tue Nov 11 17:33:23 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1565332962; cv=none; d=zoho.com; s=zohoarc; b=J0mLmv2qhPcC5rHPnKDoK6HBAA3Ec31DHnlq0NmiPGlG2WyFWmbIqxMgiw6nPFFj65axBEEH1W8meQiEz8jrjmKLQw8yAzpt8UfOlWt1dogESSs4Z7ObTbekkB3tuTx7tcDzcexQ8GH4KNa8FIuzL57gMwqGVZuZUKuy3CumirM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1565332962; 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Fri, 9 Aug 2019 06:40:50 +0000 (UTC) From: P J P To: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Fri, 9 Aug 2019 12:08:35 +0530 Message-Id: <20190809063835.6717-3-ppandit@redhat.com> In-Reply-To: <20190809063835.6717-1-ppandit@redhat.com> References: <20190809063835.6717-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Fri, 09 Aug 2019 06:40:56 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v3 2/2] scsi: lsi: use macro LSI_MAX_INSN instead of a magic number X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Prasad J Pandit , Marcelo Tosatti , Mark Cave-Ayland , QEMU Developers , Bugs SysSec , Paolo Bonzini , Stefano Garzarella Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Prasad J Pandit Use macro 'LSI_MAX_INSN' instead of a magic number 10000. Signed-off-by: Prasad J Pandit --- hw/scsi/lsi53c895a.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c index e703ef4c9d..f6786607f8 100644 --- a/hw/scsi/lsi53c895a.c +++ b/hw/scsi/lsi53c895a.c @@ -1578,7 +1578,7 @@ again: } } } - if (insn_processed > 10000 && s->waiting =3D=3D LSI_NOWAIT) { + if (insn_processed > LSI_MAX_INSN && s->waiting =3D=3D LSI_NOWAIT) { /* Some windows drivers make the device spin waiting for a memory location to change. If we have been executed a lot of code then assume this is the case and force an unexpected device disconne= ct. --=20 2.21.0