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Wed, 8 May 2024 10:35:59 +0000 Received: from DM6PR10MB3113.namprd10.prod.outlook.com ([fe80::e0b9:12d5:badd:6fe0]) by DM6PR10MB3113.namprd10.prod.outlook.com ([fe80::e0b9:12d5:badd:6fe0%7]) with mapi id 15.20.7544.045; Wed, 8 May 2024 10:35:58 +0000 From: "Jose E. Marchesi" To: bpf@vger.kernel.org Cc: "Jose E . Marchesi" , david.faust@oracle.com, cupertino.miranda@oracle.com, Yonghong Song , Eduard Zingerman Subject: [PATCH bpf-next V3] bpf: avoid UB in usages of the __imm_insn macro Date: Wed, 8 May 2024 12:35:51 +0200 Message-Id: <20240508103551.14955-1-jose.marchesi@oracle.com> X-Mailer: git-send-email 2.30.2 X-ClientProxiedBy: LNXP265CA0020.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:5e::32) To DM6PR10MB3113.namprd10.prod.outlook.com (2603:10b6:5:1a7::12) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR10MB3113:EE_|IA0PR10MB6844:EE_ X-MS-Office365-Filtering-Correlation-Id: b6c94e4d-faef-466b-3660-08dc6f4aa5b5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|1800799015|376005|366007; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR10MB3113.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(1800799015)(376005)(366007);DIR:OUT;SFP:1101; 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However, GCC detects the potential problem (indirectly) by issuing a warning stating that a temporary is used uninitialized, where the temporary corresponds to the memory read by *(long *). This patch adds -fno-strict-aliasing to the compilation flags of the particular selftests that do type punning via __imm_insn, only for GCC. Tested in master bpf-next. No regressions. Signed-off-by: Jose E. Marchesi Cc: david.faust@oracle.com Cc: cupertino.miranda@oracle.com Cc: Yonghong Song Cc: Eduard Zingerman Acked-by: Yonghong Song --- tools/testing/selftests/bpf/Makefile | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 511ea84139a3..e962a0bd8a78 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -86,6 +86,19 @@ progs/btf_dump_test_case_namespacing.c-bpf_gcc-CFLAGS := -Wno-error progs/btf_dump_test_case_packing.c-bpf_gcc-CFLAGS := -Wno-error progs/btf_dump_test_case_padding.c-bpf_gcc-CFLAGS := -Wno-error progs/btf_dump_test_case_syntax.c-bpf_gcc-CFLAGS := -Wno-error + +# The following tests do type-punning, via the __imm_insn macro, from +# `struct bpf_insn' to long and then uses the value. This triggers an +# "is used uninitialized" warning in GCC due to strict-aliasing +# rules. +progs/verifier_ref_tracking.c-bpf_gcc-CFLAGS := -fno-strict-aliasing +progs/verifier_unpriv.c-bpf_gcc-CFLAGS := -fno-strict-aliasing +progs/verifier_cgroup_storage.c-bpf_gcc-CFLAGS := -fno-strict-aliasing +progs/verifier_ld_ind.c-bpf_gcc-CFLAGS := -fno-strict-aliasing +progs/verifier_map_ret_val.c-bpf_gcc-CFLAGS := -fno-strict-aliasing +progs/verifier_spill_fill.c-bpf_gcc-CFLAGS := -fno-strict-aliasing +progs/verifier_subprog_precision.c-bpf_gcc-CFLAGS := -fno-strict-aliasing +progs/verifier_uninit.c-bpf_gcc-CFLAGS := -fno-strict-aliasing endif ifneq ($(CLANG_CPUV4),)