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Date: Thu, 19 May 2022 10:31:57 +0800
From: kernel test robot <lkp@...el.com>
To: Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
bpf@...r.kernel.org
Cc: kbuild-all@...ts.01.org, ast@...nel.org, daniel@...earbox.net,
andrii@...nel.org, Stanislav Fomichev <sdf@...gle.com>
Subject: Re: [PATCH bpf-next v7 05/11] bpf: implement BPF_PROG_QUERY for
BPF_LSM_CGROUP
Hi Stanislav,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Stanislav-Fomichev/bpf-cgroup_sock-lsm-flavor/20220519-065944
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20220519/202205191035.Ja5udws3-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/f3b115441e4b11ef3e65cad30e1c8fb7a2becfab
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Stanislav-Fomichev/bpf-cgroup_sock-lsm-flavor/20220519-065944
git checkout f3b115441e4b11ef3e65cad30e1c8fb7a2becfab
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
kernel/bpf/cgroup.c: In function '__cgroup_bpf_query':
>> kernel/bpf/cgroup.c:1091:30: error: 'CGROUP_LSM_START' undeclared (first use in this function); did you mean 'CGROUP_LSM_NUM'?
1091 | from_atype = CGROUP_LSM_START;
| ^~~~~~~~~~~~~~~~
| CGROUP_LSM_NUM
kernel/bpf/cgroup.c:1091:30: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/bpf/cgroup.c:1092:28: error: 'CGROUP_LSM_END' undeclared (first use in this function); did you mean 'CGROUP_LSM_NUM'?
1092 | to_atype = CGROUP_LSM_END;
| ^~~~~~~~~~~~~~
| CGROUP_LSM_NUM
vim +1091 kernel/bpf/cgroup.c
1072
1073 /* Must be called with cgroup_mutex held to avoid races. */
1074 static int __cgroup_bpf_query(struct cgroup *cgrp, const union bpf_attr *attr,
1075 union bpf_attr __user *uattr)
1076 {
1077 __u32 __user *prog_attach_flags = u64_to_user_ptr(attr->query.prog_attach_flags);
1078 __u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
1079 enum bpf_attach_type type = attr->query.attach_type;
1080 enum cgroup_bpf_attach_type atype;
1081 struct bpf_prog_array *effective;
1082 struct hlist_head *progs;
1083 struct bpf_prog *prog;
1084 int cnt, ret = 0, i;
1085 int total_cnt = 0;
1086 u32 flags;
1087
1088 enum cgroup_bpf_attach_type from_atype, to_atype;
1089
1090 if (type == BPF_LSM_CGROUP) {
> 1091 from_atype = CGROUP_LSM_START;
> 1092 to_atype = CGROUP_LSM_END;
1093 } else {
1094 from_atype = to_cgroup_bpf_attach_type(type);
1095 if (from_atype < 0)
1096 return -EINVAL;
1097 to_atype = from_atype;
1098 }
1099
1100 for (atype = from_atype; atype <= to_atype; atype++) {
1101 progs = &cgrp->bpf.progs[atype];
1102 flags = cgrp->bpf.flags[atype];
1103
1104 effective = rcu_dereference_protected(cgrp->bpf.effective[atype],
1105 lockdep_is_held(&cgroup_mutex));
1106
1107 if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE)
1108 total_cnt += bpf_prog_array_length(effective);
1109 else
1110 total_cnt += prog_list_length(progs);
1111 }
1112
1113 if (type != BPF_LSM_CGROUP)
1114 if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags)))
1115 return -EFAULT;
1116 if (copy_to_user(&uattr->query.prog_cnt, &total_cnt, sizeof(total_cnt)))
1117 return -EFAULT;
1118 if (attr->query.prog_cnt == 0 || !prog_ids || !total_cnt)
1119 /* return early if user requested only program count + flags */
1120 return 0;
1121
1122 if (attr->query.prog_cnt < total_cnt) {
1123 total_cnt = attr->query.prog_cnt;
1124 ret = -ENOSPC;
1125 }
1126
1127 for (atype = from_atype; atype <= to_atype; atype++) {
1128 if (total_cnt <= 0)
1129 break;
1130
1131 progs = &cgrp->bpf.progs[atype];
1132 flags = cgrp->bpf.flags[atype];
1133
1134 effective = rcu_dereference_protected(cgrp->bpf.effective[atype],
1135 lockdep_is_held(&cgroup_mutex));
1136
1137 if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE)
1138 cnt = bpf_prog_array_length(effective);
1139 else
1140 cnt = prog_list_length(progs);
1141
1142 if (cnt >= total_cnt)
1143 cnt = total_cnt;
1144
1145 if (attr->query.query_flags & BPF_F_QUERY_EFFECTIVE) {
1146 ret = bpf_prog_array_copy_to_user(effective, prog_ids, cnt);
1147 } else {
1148 struct bpf_prog_list *pl;
1149 u32 id;
1150
1151 i = 0;
1152 hlist_for_each_entry(pl, progs, node) {
1153 prog = prog_list_prog(pl);
1154 id = prog->aux->id;
1155 if (copy_to_user(prog_ids + i, &id, sizeof(id)))
1156 return -EFAULT;
1157 if (++i == cnt)
1158 break;
1159 }
1160 }
1161
1162 if (prog_attach_flags)
1163 for (i = 0; i < cnt; i++)
1164 if (copy_to_user(prog_attach_flags + i, &flags, sizeof(flags)))
1165 return -EFAULT;
1166
1167 prog_ids += cnt;
1168 total_cnt -= cnt;
1169 if (prog_attach_flags)
1170 prog_attach_flags += cnt;
1171 }
1172 return ret;
1173 }
1174
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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