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Marchesi" To: bpf@vger.kernel.org Cc: "Jose E . Marchesi" , david.faust@oracle.com, cupertino.miranda@oracle.com, Eduard Zingerman , Yonghong Song , Andrii Nakryiko Subject: [PATCH bpf-next V2] bpf: avoid uninitialized value in BPF_CORE_READ_BITFIELD Date: Wed, 8 May 2024 12:13:13 +0200 Message-Id: <20240508101313.16662-1-jose.marchesi@oracle.com> X-Mailer: git-send-email 2.30.2 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: LO4P123CA0494.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:1ab::13) 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_|SA2PR10MB4521:EE_ X-MS-Office365-Filtering-Correlation-Id: 8ee85561-7efd-4c72-e657-08dc6f477cf3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|1800799015|366007|376005; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?3wtm1Q/INueayYeQ/UNeueGbI1BwOq6ThG/c6243fjSW5iu/ORRgjB5mmmXq?= =?us-ascii?Q?3t80N0CPaJ/XbcjCUm/8f4FmvHvwr/BawO1aukrDugQ51RnNC9ONJFkdo9T5?= =?us-ascii?Q?1Ou4e+Pkur4UvHMAzwM26eGTmUYgUFxBNFndfqd3kLQrUDW+PXUM5JG1taGy?= =?us-ascii?Q?ofzNbIVqooHSuuwKWDzfLFm0ar0M3h/JXNwJbesEnHGgonLsrM/+nhkvzdIj?= =?us-ascii?Q?ylRQ9ESzhWP49NVLhhxBmED4JZTtA5VvQogW9QAcb1Bd0ktk0pLg1EgrfTb4?= =?us-ascii?Q?9HoiBcGZ2NTxz/FlViPG3DOpoUOueF0TkkNfoGpmVnIpm4Rn6faung+G/Btp?= =?us-ascii?Q?yahJPZ1S0deF8YUJUU+Tj3PoQV2W9Fkk9WH5sePN/ODqiCv14SiY9JLMOP/K?= =?us-ascii?Q?0JiszYzoYuPFNHv3NFUji57iAp3LxZ/cMDmUid+Btv+tjXEHi7ozEJh1iPSQ?= =?us-ascii?Q?PjVx2Rqjht18FSzIu+Ys7+dR1HvahvVJzriGJ3hKaYrAfRV5vYBR71HeIPiY?= =?us-ascii?Q?fCveftclIUpYoiI60tNRTVxqXXRhuVpWwzlVQAiUIVFkZuH/G5gl6ef2kpXF?= =?us-ascii?Q?AHInRYKUVEH6OE8FFtw3/MIatqaC9Ybt3v8lQgn1TLbWi57xcQ2CG1teE90p?= =?us-ascii?Q?d2dFPi0/iABJguNUu2/VrdQa0PXYLAjGREkF9N3jFRnP1dlfdkaYsKZYVpwG?= =?us-ascii?Q?Uuav+x5j4cy5JEJqGtcEmx/hfi05vAybRW9CaDQJxDJr0B4DFgEU3ODUdqlu?= =?us-ascii?Q?/aRk8unvh+jzZuuowbJCJgMg6oL2LDIQ0tHN+MRkOiytt7wQ79j6hLELTZP7?= =?us-ascii?Q?fqTOcNsgns28GMV74rnTQMbpjmb/GmIaGndPk5zrQqn1wbVLInMLTmm1gOR4?= =?us-ascii?Q?WH0tW2m0rNpe98OuXxogigLGJ/OBxAAyapL2ugcWgTV5LNy9OEvuQD75NpY6?= =?us-ascii?Q?UpCDRIW3lQVq7TFSHQIeC1O3MfYoOaL5QbZyeS/yImtKGVwVqWufaY45u7YM?= =?us-ascii?Q?5ZCPYv4Et22sK0q0jGN3J3vgl0adGqdxyRxxDzdJsKjesuNnN+KV0q9+KYGx?= =?us-ascii?Q?V8wag5q58hdmKVjYdIG6XOa8LAvJBtjXfRGGEINKlzxm9E6tkZd7leM+F05x?= =?us-ascii?Q?chNd1DpaF36vEe58TAO8PJkT0UllLp9WGyyrFlxh4XJFCLLFbyMp5IAnvPad?= =?us-ascii?Q?U6yZT8bEqEZk6HbWSJfGuRQbkXeszAa//rboJq2Zuu6YR+ylEixnV13i4wT0?= =?us-ascii?Q?ijoaJR6i6aDVVUiyS9apLaEtHbgvRtzb0VNHphYdaQ=3D=3D?= 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)(366007)(376005);DIR:OUT;SFP:1101; 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\ [...] \ switch (__CORE_RELO(s, field, BYTE_SIZE)) { \ case 1: val = *(const unsigned char *)p; break; \ case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ } \ [...] val; \ } \ This patch adds a default entry in the switch statement that sets `val' to zero in order to avoid the warning, and random values to be used in case __builtin_preserve_field_info returns unexpected values for BPF_FIELD_BYTE_SIZE. Tested in bpf-next master. No regressions. Signed-off-by: Jose E. Marchesi Cc: david.faust@oracle.com Cc: cupertino.miranda@oracle.com Cc: Eduard Zingerman Cc: Yonghong Song Cc: Andrii Nakryiko --- tools/lib/bpf/bpf_core_read.h | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/lib/bpf/bpf_core_read.h b/tools/lib/bpf/bpf_core_read.h index b5c7ce5c243a..c0e13cdf9660 100644 --- a/tools/lib/bpf/bpf_core_read.h +++ b/tools/lib/bpf/bpf_core_read.h @@ -104,6 +104,7 @@ enum bpf_enum_value_kind { case 2: val = *(const unsigned short *)p; break; \ case 4: val = *(const unsigned int *)p; break; \ case 8: val = *(const unsigned long long *)p; break; \ + default: val = 0; break; \ } \ val <<= __CORE_RELO(s, field, LSHIFT_U64); \ if (__CORE_RELO(s, field, SIGNED)) \ -- 2.30.2