Hi David, I love your patch! Perhaps something to improve: [auto build test WARNING on cgroup/for-next] [also build test WARNING on dhowells-fs/fscache-next linus/master v5.11-rc6] [cannot apply to security/next-testing tip/timers/core next-20210125] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/David-Howells/keys-request_key-interception-in-containers/20210205-015946 base: https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next config: powerpc64-randconfig-s031-20210204 (attached as .config) compiler: powerpc-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://github.com/0day-ci/linux/commit/6d049eb50238910e375143259391790a8b69ebc6 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review David-Howells/keys-request_key-interception-in-containers/20210205-015946 git checkout 6d049eb50238910e375143259391790a8b69ebc6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> "sparse warnings: (new ones prefixed by >>)" >> security/keys/service.c:101:40: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected char const *type @@ got char const [noderef] __user *type_name @@ security/keys/service.c:101:40: sparse: expected char const *type security/keys/service.c:101:40: sparse: got char const [noderef] __user *type_name >> security/keys/service.c:177:9: sparse: sparse: incompatible types in comparison expression (different address spaces): >> security/keys/service.c:177:9: sparse: struct hlist_node [noderef] __rcu * >> security/keys/service.c:177:9: sparse: struct hlist_node * vim +101 security/keys/service.c 61 62 /* 63 * Allocate a service record. 64 */ 65 static struct request_key_service *alloc_key_service(key_serial_t queue_keyring, 66 const char __user *type_name, 67 unsigned int ns_mask) 68 { 69 struct request_key_service *svc; 70 struct key_type *type; 71 key_ref_t key_ref; 72 int ret; 73 u8 selectivity = 0; 74 75 svc = kzalloc(sizeof(struct request_key_service), GFP_KERNEL); 76 if (!svc) 77 return ERR_PTR(-ENOMEM); 78 79 if (queue_keyring != 0) { 80 key_ref = lookup_user_key(queue_keyring, 0, KEY_NEED_SEARCH); 81 if (IS_ERR(key_ref)) { 82 ret = PTR_ERR(key_ref); 83 goto err_svc; 84 } 85 86 svc->queue_keyring = key_ref_to_ptr(key_ref); 87 } 88 89 /* Save the matching criteria. Anything the caller doesn't care about 90 * we leave as NULL. 91 */ 92 if (type_name) { 93 ret = strncpy_from_user(svc->type, type_name, sizeof(svc->type)); 94 if (ret < 0) 95 goto err_keyring; 96 if (ret >= sizeof(svc->type)) { 97 ret = -EINVAL; 98 goto err_keyring; 99 } 100 > 101 type = key_type_lookup(type_name); 102 if (IS_ERR(type)) { 103 ret = -EINVAL; 104 goto err_keyring; 105 } 106 memcpy(svc->type, type->name, sizeof(svc->type)); 107 key_type_put(type); 108 } 109 110 if (ns_mask & KEY_SERVICE_NS_UTS) { 111 svc->uts_ns = get_ns_tag(current->nsproxy->uts_ns->ns.tag); 112 selectivity++; 113 } 114 if (ns_mask & KEY_SERVICE_NS_IPC) { 115 svc->ipc_ns = get_ns_tag(current->nsproxy->ipc_ns->ns.tag); 116 selectivity++; 117 } 118 if (ns_mask & KEY_SERVICE_NS_MNT) { 119 svc->mnt_ns = get_ns_tag(current->nsproxy->mnt_ns->ns.tag); 120 selectivity++; 121 } 122 if (ns_mask & KEY_SERVICE_NS_PID) { 123 svc->pid_ns = get_ns_tag(task_active_pid_ns(current)->ns.tag); 124 selectivity++; 125 } 126 if (ns_mask & KEY_SERVICE_NS_NET) { 127 svc->net_ns = get_ns_tag(current->nsproxy->net_ns->ns.tag); 128 selectivity++; 129 } 130 if (ns_mask & KEY_SERVICE_NS_CGROUP) { 131 svc->cgroup_ns = get_ns_tag(current->nsproxy->cgroup_ns->ns.tag); 132 selectivity++; 133 } 134 135 svc->selectivity = selectivity; 136 return svc; 137 138 err_keyring: 139 key_put(svc->queue_keyring); 140 err_svc: 141 kfree(svc); 142 return ERR_PTR(ret); 143 } 144 145 /* 146 * Install a request_key service into the user namespace's list 147 */ 148 static int install_key_service(struct user_namespace *user_ns, 149 struct request_key_service *svc) 150 { 151 struct request_key_service *p; 152 struct hlist_node **pp; 153 int ret = 0; 154 155 spin_lock(&user_ns->request_key_services_lock); 156 157 /* The services list is kept in order of selectivity. The more exact 158 * matches a service requires, the earlier it is in the list. 159 */ 160 for (pp = &user_ns->request_key_services.first; *pp; pp = &(*pp)->next) { 161 p = hlist_entry(*pp, struct request_key_service, user_ns_link); 162 if (p->selectivity < svc->selectivity) 163 goto insert_before; 164 if (p->selectivity > svc->selectivity) 165 continue; 166 if (memcmp(p->type, svc->type, sizeof(p->type)) == 0 && 167 p->uts_ns == svc->uts_ns && 168 p->ipc_ns == svc->ipc_ns && 169 p->mnt_ns == svc->mnt_ns && 170 p->pid_ns == svc->pid_ns && 171 p->net_ns == svc->net_ns && 172 p->cgroup_ns == svc->cgroup_ns) 173 goto duplicate; 174 } 175 176 svc->user_ns_link.pprev = pp; > 177 rcu_assign_pointer(*pp, &svc->user_ns_link); 178 goto out; 179 180 insert_before: 181 hlist_add_before_rcu(&svc->user_ns_link, &p->user_ns_link); 182 goto out; 183 184 duplicate: 185 free_key_service(svc); 186 ret = -EEXIST; 187 out: 188 spin_unlock(&user_ns->request_key_services_lock); 189 return ret; 190 } 191 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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