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helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C From: Michal Orzel To: CC: Michal Orzel , Andrew Cooper , George Dunlap , "Jan Beulich" , Julien Grall , "Stefano Stabellini" , Wei Liu Subject: [PATCH] ubsan: Fix pointer overflow error message Date: Tue, 7 Nov 2023 10:14:17 +0100 Message-ID: <20231107091417.34159-1-michal.orzel@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9DB:EE_|DM6PR12MB4043:EE_ X-MS-Office365-Filtering-Correlation-Id: 44bd74e2-ee25-4976-ac6c-08dbdf720652 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(396003)(136003)(39860400002)(346002)(376002)(230922051799003)(451199024)(1800799009)(64100799003)(82310400011)(186009)(40470700004)(36840700001)(46966006)(8676002)(41300700001)(6916009)(8936002)(36756003)(4326008)(40480700001)(2906002)(36860700001)(5660300002)(356005)(54906003)(316002)(86362001)(44832011)(47076005)(81166007)(426003)(70586007)(70206006)(83380400001)(336012)(40460700003)(26005)(82740400003)(2616005)(1076003)(6666004)(478600001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2023 09:15:02.7310 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 44bd74e2-ee25-4976-ac6c-08dbdf720652 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9DB.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4043 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1699348542593100001 Content-Type: text/plain; charset="utf-8" In __ubsan_handle_pointer_overflow(), fix the condition for determining whether a pointer operation overflowed or underflowed. Currently, the function reports "underflowed" when it should be reporting "overflowed" and vice versa. Example of incorrect error reporting: void *foo =3D (void *)__UINTPTR_MAX__; foo +=3D 1; UBSAN: pointer operation underflowed ffffffff to 00000000 Fixes: 4e3fb2fb47d6 ("ubsan: add clang 5.0 support") Signed-off-by: Michal Orzel Acked-by: Andrew Cooper --- xen/common/ubsan/ubsan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/common/ubsan/ubsan.c b/xen/common/ubsan/ubsan.c index 0fddacabda6a..a3a80fa99eec 100644 --- a/xen/common/ubsan/ubsan.c +++ b/xen/common/ubsan/ubsan.c @@ -513,7 +513,7 @@ void __ubsan_handle_pointer_overflow(struct pointer_ove= rflow_data *data, ubsan_prologue(&data->location, &flags); =20 pr_err("pointer operation %s %p to %p\n", - base > result ? "underflowed" : "overflowed", + base > result ? "overflowed" : "underflowed", _p(base), _p(result)); =20 ubsan_epilogue(&flags); --=20 2.25.1