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Wed, 4 Oct 2023 17:08:37 -0700 From: Aaron Plattner To: CC: Josh Poimboeuf , Peter Zijlstra , Aaron Plattner Subject: [PATCH 1/2] objtool: return the result of objtool_run() so the build fails if objtool doesn't work Date: Wed, 4 Oct 2023 17:08:18 -0700 Message-ID: X-Mailer: git-send-email 2.42.0 In-Reply-To: References: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF00003443:EE_|DM4PR12MB5167:EE_ X-MS-Office365-Filtering-Correlation-Id: 1ff7fa2d-7010-4beb-8b26-08dbc5374091 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:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230031)(4636009)(396003)(39860400002)(376002)(136003)(346002)(230922051799003)(64100799003)(186009)(82310400011)(451199024)(1800799009)(46966006)(40470700004)(36840700001)(2616005)(70206006)(70586007)(54906003)(40460700003)(6916009)(316002)(41300700001)(107886003)(26005)(426003)(336012)(6666004)(36756003)(478600001)(82740400003)(7636003)(356005)(86362001)(47076005)(83380400001)(36860700001)(40480700001)(4744005)(2906002)(4326008)(8936002)(8676002)(5660300002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2023 00:08:49.8647 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1ff7fa2d-7010-4beb-8b26-08dbc5374091 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003443.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5167 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If objtool runs into a problem that causes it to exit early, the overall tool still returns a status code of 0, which causes the build to continue as if nothing went wrong. Fixes: b51277eb9775 ("objtool: Ditch subcommands") Signed-off-by: Aaron Plattner Cc: Josh Poimboeuf Cc: Peter Zijlstra --- tools/objtool/objtool.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c index c54f7235c5d94..f40febdd6e36a 100644 --- a/tools/objtool/objtool.c +++ b/tools/objtool/objtool.c @@ -146,7 +146,5 @@ int main(int argc, const char **argv) exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED); pager_init(UNUSED); =20 - objtool_run(argc, argv); - - return 0; + return objtool_run(argc, argv); } --=20 2.42.0 From nobody Sat Jan 3 03:54:03 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D29D4E936EF for ; Thu, 5 Oct 2023 00:08:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244193AbjJEAI7 (ORCPT ); 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Wed, 4 Oct 2023 17:08:38 -0700 Received: from drhqmail201.nvidia.com (10.126.190.180) by drhqmail203.nvidia.com (10.126.190.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.41; Wed, 4 Oct 2023 17:08:38 -0700 Received: from treble.fun (10.127.8.9) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server id 15.2.986.41 via Frontend Transport; Wed, 4 Oct 2023 17:08:38 -0700 From: Aaron Plattner To: CC: Josh Poimboeuf , Peter Zijlstra , Aaron Plattner Subject: [PATCH 2/2] objtool: use strndup() to avoid the need for a maximum symbol name length Date: Wed, 4 Oct 2023 17:08:19 -0700 Message-ID: <41e94cfea1d9131b758dd637fecdeacd459d4584.1696355111.git.aplattner@nvidia.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: References: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0001A0F9:EE_|MN2PR12MB4390:EE_ X-MS-Office365-Filtering-Correlation-Id: 436d7932-eadd-4d1f-6eac-08dbc537412e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Oct 2023 00:08:50.8617 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 436d7932-eadd-4d1f-6eac-08dbc537412e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A0F9.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4390 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If one of the symbols processed by read_symbols() happens to have a .cold variant with a name longer than objtool's MAX_NAME_LEN limit, the build fails. Avoid this problem by just using strndup() to copy the parent function's name, rather than strncpy()ing it onto the stack. Signed-off-by: Aaron Plattner Cc: Josh Poimboeuf Cc: Peter Zijlstra --- tools/objtool/elf.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 081befa4674b8..3d27983dc908d 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -22,8 +22,6 @@ #include #include =20 -#define MAX_NAME_LEN 128 - static inline u32 str_hash(const char *str) { return jhash(str, strlen(str), 0); @@ -515,7 +513,7 @@ static int read_symbols(struct elf *elf) /* Create parent/child links for any cold subfunctions */ list_for_each_entry(sec, &elf->sections, list) { sec_for_each_sym(sec, sym) { - char pname[MAX_NAME_LEN + 1]; + char *pname; size_t pnamelen; if (sym->type !=3D STT_FUNC) continue; @@ -531,15 +529,15 @@ static int read_symbols(struct elf *elf) continue; =20 pnamelen =3D coldstr - sym->name; - if (pnamelen > MAX_NAME_LEN) { - WARN("%s(): parent function name exceeds maximum length of %d characte= rs", - sym->name, MAX_NAME_LEN); + pname =3D strndup(sym->name, pnamelen); + if (!pname) { + WARN("%s(): failed to allocate memory", + sym->name); return -1; } =20 - strncpy(pname, sym->name, pnamelen); - pname[pnamelen] =3D '\0'; pfunc =3D find_symbol_by_name(elf, pname); + free(pname); =20 if (!pfunc) { WARN("%s(): can't find parent function", --=20 2.42.0