19f46080cSMatt Helsley /* 29f46080cSMatt Helsley * cn_proc.c - process events connector 39f46080cSMatt Helsley * 49f46080cSMatt Helsley * Copyright (C) Matt Helsley, IBM Corp. 2005 59f46080cSMatt Helsley * Based on cn_fork.c by Guillaume Thouvenin <guillaume.thouvenin@bull.net> 69f46080cSMatt Helsley * Original copyright notice follows: 79f46080cSMatt Helsley * Copyright (C) 2005 BULL SA. 89f46080cSMatt Helsley * 99f46080cSMatt Helsley * 109f46080cSMatt Helsley * This program is free software; you can redistribute it and/or modify 119f46080cSMatt Helsley * it under the terms of the GNU General Public License as published by 129f46080cSMatt Helsley * the Free Software Foundation; either version 2 of the License, or 139f46080cSMatt Helsley * (at your option) any later version. 149f46080cSMatt Helsley * 159f46080cSMatt Helsley * This program is distributed in the hope that it will be useful, 169f46080cSMatt Helsley * but WITHOUT ANY WARRANTY; without even the implied warranty of 179f46080cSMatt Helsley * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 189f46080cSMatt Helsley * GNU General Public License for more details. 199f46080cSMatt Helsley * 209f46080cSMatt Helsley * You should have received a copy of the GNU General Public License 219f46080cSMatt Helsley * along with this program; if not, write to the Free Software 229f46080cSMatt Helsley * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 239f46080cSMatt Helsley */ 249f46080cSMatt Helsley 259f46080cSMatt Helsley #include <linux/module.h> 269f46080cSMatt Helsley #include <linux/kernel.h> 27caf3c9dcSMatt Helsley #include <linux/ktime.h> 289f46080cSMatt Helsley #include <linux/init.h> 291d31a4eaSMatt Helsley #include <linux/connector.h> 305a0e3ad6STejun Heo #include <linux/gfp.h> 31f701e5b7SVladimir Zapolskiy #include <linux/ptrace.h> 3260063497SArun Sharma #include <linux/atomic.h> 339582d901SEric W. Biederman #include <linux/pid_namespace.h> 3460063497SArun Sharma 35af3e095aSErik Jacobson #include <asm/unaligned.h> 369f46080cSMatt Helsley 379f46080cSMatt Helsley #include <linux/cn_proc.h> 389f46080cSMatt Helsley 399f46080cSMatt Helsley #define CN_PROC_MSG_SIZE (sizeof(struct cn_msg) + sizeof(struct proc_event)) 409f46080cSMatt Helsley 419f46080cSMatt Helsley static atomic_t proc_event_num_listeners = ATOMIC_INIT(0); 429f46080cSMatt Helsley static struct cb_id cn_proc_event_id = { CN_IDX_PROC, CN_VAL_PROC }; 439f46080cSMatt Helsley 44cc398c2eSDavid S. Miller /* proc_event_counts is used as the sequence number of the netlink message */ 459f46080cSMatt Helsley static DEFINE_PER_CPU(__u32, proc_event_counts) = { 0 }; 469f46080cSMatt Helsley 479f46080cSMatt Helsley static inline void get_seq(__u32 *ts, int *cpu) 489f46080cSMatt Helsley { 493ea9f683SChristoph Lameter preempt_disable(); 503ea9f683SChristoph Lameter *ts = __this_cpu_inc_return(proc_event_counts) - 1; 519f46080cSMatt Helsley *cpu = smp_processor_id(); 523ea9f683SChristoph Lameter preempt_enable(); 539f46080cSMatt Helsley } 549f46080cSMatt Helsley 559f46080cSMatt Helsley void proc_fork_connector(struct task_struct *task) 569f46080cSMatt Helsley { 579f46080cSMatt Helsley struct cn_msg *msg; 589f46080cSMatt Helsley struct proc_event *ev; 599f46080cSMatt Helsley __u8 buffer[CN_PROC_MSG_SIZE]; 60822cfbffSChandra Seetharaman struct timespec ts; 619e8f90dfSOleg Nesterov struct task_struct *parent; 629f46080cSMatt Helsley 639f46080cSMatt Helsley if (atomic_read(&proc_event_num_listeners) < 1) 649f46080cSMatt Helsley return; 659f46080cSMatt Helsley 669f46080cSMatt Helsley msg = (struct cn_msg *)buffer; 679f46080cSMatt Helsley ev = (struct proc_event *)msg->data; 689f46080cSMatt Helsley get_seq(&msg->seq, &ev->cpu); 69822cfbffSChandra Seetharaman ktime_get_ts(&ts); /* get high res monotonic timestamp */ 70af3e095aSErik Jacobson put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 719f46080cSMatt Helsley ev->what = PROC_EVENT_FORK; 729e8f90dfSOleg Nesterov rcu_read_lock(); 739e8f90dfSOleg Nesterov parent = rcu_dereference(task->real_parent); 749e8f90dfSOleg Nesterov ev->event_data.fork.parent_pid = parent->pid; 759e8f90dfSOleg Nesterov ev->event_data.fork.parent_tgid = parent->tgid; 769e8f90dfSOleg Nesterov rcu_read_unlock(); 779f46080cSMatt Helsley ev->event_data.fork.child_pid = task->pid; 789f46080cSMatt Helsley ev->event_data.fork.child_tgid = task->tgid; 799f46080cSMatt Helsley 809f46080cSMatt Helsley memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 819f46080cSMatt Helsley msg->ack = 0; /* not used */ 829f46080cSMatt Helsley msg->len = sizeof(*ev); 839f46080cSMatt Helsley /* If cn_netlink_send() failed, the data is not sent */ 849f46080cSMatt Helsley cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 859f46080cSMatt Helsley } 869f46080cSMatt Helsley 879f46080cSMatt Helsley void proc_exec_connector(struct task_struct *task) 889f46080cSMatt Helsley { 899f46080cSMatt Helsley struct cn_msg *msg; 909f46080cSMatt Helsley struct proc_event *ev; 91822cfbffSChandra Seetharaman struct timespec ts; 929f46080cSMatt Helsley __u8 buffer[CN_PROC_MSG_SIZE]; 939f46080cSMatt Helsley 949f46080cSMatt Helsley if (atomic_read(&proc_event_num_listeners) < 1) 959f46080cSMatt Helsley return; 969f46080cSMatt Helsley 979f46080cSMatt Helsley msg = (struct cn_msg *)buffer; 989f46080cSMatt Helsley ev = (struct proc_event *)msg->data; 999f46080cSMatt Helsley get_seq(&msg->seq, &ev->cpu); 100822cfbffSChandra Seetharaman ktime_get_ts(&ts); /* get high res monotonic timestamp */ 101af3e095aSErik Jacobson put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 1029f46080cSMatt Helsley ev->what = PROC_EVENT_EXEC; 1039f46080cSMatt Helsley ev->event_data.exec.process_pid = task->pid; 1049f46080cSMatt Helsley ev->event_data.exec.process_tgid = task->tgid; 1059f46080cSMatt Helsley 1069f46080cSMatt Helsley memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 1079f46080cSMatt Helsley msg->ack = 0; /* not used */ 1089f46080cSMatt Helsley msg->len = sizeof(*ev); 1099f46080cSMatt Helsley cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 1109f46080cSMatt Helsley } 1119f46080cSMatt Helsley 1129f46080cSMatt Helsley void proc_id_connector(struct task_struct *task, int which_id) 1139f46080cSMatt Helsley { 1149f46080cSMatt Helsley struct cn_msg *msg; 1159f46080cSMatt Helsley struct proc_event *ev; 1169f46080cSMatt Helsley __u8 buffer[CN_PROC_MSG_SIZE]; 117822cfbffSChandra Seetharaman struct timespec ts; 118c69e8d9cSDavid Howells const struct cred *cred; 1199f46080cSMatt Helsley 1209f46080cSMatt Helsley if (atomic_read(&proc_event_num_listeners) < 1) 1219f46080cSMatt Helsley return; 1229f46080cSMatt Helsley 1239f46080cSMatt Helsley msg = (struct cn_msg *)buffer; 1249f46080cSMatt Helsley ev = (struct proc_event *)msg->data; 1259f46080cSMatt Helsley ev->what = which_id; 1269f46080cSMatt Helsley ev->event_data.id.process_pid = task->pid; 1279f46080cSMatt Helsley ev->event_data.id.process_tgid = task->tgid; 128c69e8d9cSDavid Howells rcu_read_lock(); 129c69e8d9cSDavid Howells cred = __task_cred(task); 1309f46080cSMatt Helsley if (which_id == PROC_EVENT_UID) { 1319582d901SEric W. Biederman ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns, cred->uid); 1329582d901SEric W. Biederman ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns, cred->euid); 1339f46080cSMatt Helsley } else if (which_id == PROC_EVENT_GID) { 1349582d901SEric W. Biederman ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns, cred->gid); 1359582d901SEric W. Biederman ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns, cred->egid); 136c69e8d9cSDavid Howells } else { 137c69e8d9cSDavid Howells rcu_read_unlock(); 1389f46080cSMatt Helsley return; 139c69e8d9cSDavid Howells } 140c69e8d9cSDavid Howells rcu_read_unlock(); 1419f46080cSMatt Helsley get_seq(&msg->seq, &ev->cpu); 142822cfbffSChandra Seetharaman ktime_get_ts(&ts); /* get high res monotonic timestamp */ 143af3e095aSErik Jacobson put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 1449f46080cSMatt Helsley 1459f46080cSMatt Helsley memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 1469f46080cSMatt Helsley msg->ack = 0; /* not used */ 1479f46080cSMatt Helsley msg->len = sizeof(*ev); 1489f46080cSMatt Helsley cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 1499f46080cSMatt Helsley } 1509f46080cSMatt Helsley 15102b51df1SScott James Remnant void proc_sid_connector(struct task_struct *task) 15202b51df1SScott James Remnant { 15302b51df1SScott James Remnant struct cn_msg *msg; 15402b51df1SScott James Remnant struct proc_event *ev; 15502b51df1SScott James Remnant struct timespec ts; 15602b51df1SScott James Remnant __u8 buffer[CN_PROC_MSG_SIZE]; 15702b51df1SScott James Remnant 15802b51df1SScott James Remnant if (atomic_read(&proc_event_num_listeners) < 1) 15902b51df1SScott James Remnant return; 16002b51df1SScott James Remnant 16102b51df1SScott James Remnant msg = (struct cn_msg *)buffer; 16202b51df1SScott James Remnant ev = (struct proc_event *)msg->data; 16302b51df1SScott James Remnant get_seq(&msg->seq, &ev->cpu); 16402b51df1SScott James Remnant ktime_get_ts(&ts); /* get high res monotonic timestamp */ 16502b51df1SScott James Remnant put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 16602b51df1SScott James Remnant ev->what = PROC_EVENT_SID; 16702b51df1SScott James Remnant ev->event_data.sid.process_pid = task->pid; 16802b51df1SScott James Remnant ev->event_data.sid.process_tgid = task->tgid; 16902b51df1SScott James Remnant 17002b51df1SScott James Remnant memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 17102b51df1SScott James Remnant msg->ack = 0; /* not used */ 17202b51df1SScott James Remnant msg->len = sizeof(*ev); 17302b51df1SScott James Remnant cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 17402b51df1SScott James Remnant } 17502b51df1SScott James Remnant 176f701e5b7SVladimir Zapolskiy void proc_ptrace_connector(struct task_struct *task, int ptrace_id) 177f701e5b7SVladimir Zapolskiy { 178f701e5b7SVladimir Zapolskiy struct cn_msg *msg; 179f701e5b7SVladimir Zapolskiy struct proc_event *ev; 180f701e5b7SVladimir Zapolskiy struct timespec ts; 181f701e5b7SVladimir Zapolskiy __u8 buffer[CN_PROC_MSG_SIZE]; 182f701e5b7SVladimir Zapolskiy 183f701e5b7SVladimir Zapolskiy if (atomic_read(&proc_event_num_listeners) < 1) 184f701e5b7SVladimir Zapolskiy return; 185f701e5b7SVladimir Zapolskiy 186f701e5b7SVladimir Zapolskiy msg = (struct cn_msg *)buffer; 187f701e5b7SVladimir Zapolskiy ev = (struct proc_event *)msg->data; 188f701e5b7SVladimir Zapolskiy get_seq(&msg->seq, &ev->cpu); 189f701e5b7SVladimir Zapolskiy ktime_get_ts(&ts); /* get high res monotonic timestamp */ 190f701e5b7SVladimir Zapolskiy put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 191f701e5b7SVladimir Zapolskiy ev->what = PROC_EVENT_PTRACE; 192f701e5b7SVladimir Zapolskiy ev->event_data.ptrace.process_pid = task->pid; 193f701e5b7SVladimir Zapolskiy ev->event_data.ptrace.process_tgid = task->tgid; 194f701e5b7SVladimir Zapolskiy if (ptrace_id == PTRACE_ATTACH) { 195f701e5b7SVladimir Zapolskiy ev->event_data.ptrace.tracer_pid = current->pid; 196f701e5b7SVladimir Zapolskiy ev->event_data.ptrace.tracer_tgid = current->tgid; 197f701e5b7SVladimir Zapolskiy } else if (ptrace_id == PTRACE_DETACH) { 198f701e5b7SVladimir Zapolskiy ev->event_data.ptrace.tracer_pid = 0; 199f701e5b7SVladimir Zapolskiy ev->event_data.ptrace.tracer_tgid = 0; 200f701e5b7SVladimir Zapolskiy } else 201f701e5b7SVladimir Zapolskiy return; 202f701e5b7SVladimir Zapolskiy 203f701e5b7SVladimir Zapolskiy memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 204f701e5b7SVladimir Zapolskiy msg->ack = 0; /* not used */ 205f701e5b7SVladimir Zapolskiy msg->len = sizeof(*ev); 206f701e5b7SVladimir Zapolskiy cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 207f701e5b7SVladimir Zapolskiy } 208f701e5b7SVladimir Zapolskiy 209f786ecbaSVladimir Zapolskiy void proc_comm_connector(struct task_struct *task) 210f786ecbaSVladimir Zapolskiy { 211f786ecbaSVladimir Zapolskiy struct cn_msg *msg; 212f786ecbaSVladimir Zapolskiy struct proc_event *ev; 213f786ecbaSVladimir Zapolskiy struct timespec ts; 214f786ecbaSVladimir Zapolskiy __u8 buffer[CN_PROC_MSG_SIZE]; 215f786ecbaSVladimir Zapolskiy 216f786ecbaSVladimir Zapolskiy if (atomic_read(&proc_event_num_listeners) < 1) 217f786ecbaSVladimir Zapolskiy return; 218f786ecbaSVladimir Zapolskiy 219f786ecbaSVladimir Zapolskiy msg = (struct cn_msg *)buffer; 220f786ecbaSVladimir Zapolskiy ev = (struct proc_event *)msg->data; 221f786ecbaSVladimir Zapolskiy get_seq(&msg->seq, &ev->cpu); 222f786ecbaSVladimir Zapolskiy ktime_get_ts(&ts); /* get high res monotonic timestamp */ 223f786ecbaSVladimir Zapolskiy put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 224f786ecbaSVladimir Zapolskiy ev->what = PROC_EVENT_COMM; 225f786ecbaSVladimir Zapolskiy ev->event_data.comm.process_pid = task->pid; 226f786ecbaSVladimir Zapolskiy ev->event_data.comm.process_tgid = task->tgid; 227f786ecbaSVladimir Zapolskiy get_task_comm(ev->event_data.comm.comm, task); 228f786ecbaSVladimir Zapolskiy 229f786ecbaSVladimir Zapolskiy memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 230f786ecbaSVladimir Zapolskiy msg->ack = 0; /* not used */ 231f786ecbaSVladimir Zapolskiy msg->len = sizeof(*ev); 232f786ecbaSVladimir Zapolskiy cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 233f786ecbaSVladimir Zapolskiy } 234f786ecbaSVladimir Zapolskiy 2352b5faa4cSJesper Derehag void proc_coredump_connector(struct task_struct *task) 2362b5faa4cSJesper Derehag { 2372b5faa4cSJesper Derehag struct cn_msg *msg; 2382b5faa4cSJesper Derehag struct proc_event *ev; 2392b5faa4cSJesper Derehag __u8 buffer[CN_PROC_MSG_SIZE]; 2402b5faa4cSJesper Derehag struct timespec ts; 2412b5faa4cSJesper Derehag 2422b5faa4cSJesper Derehag if (atomic_read(&proc_event_num_listeners) < 1) 2432b5faa4cSJesper Derehag return; 2442b5faa4cSJesper Derehag 2452b5faa4cSJesper Derehag msg = (struct cn_msg *)buffer; 2462b5faa4cSJesper Derehag ev = (struct proc_event *)msg->data; 2472b5faa4cSJesper Derehag get_seq(&msg->seq, &ev->cpu); 2482b5faa4cSJesper Derehag ktime_get_ts(&ts); /* get high res monotonic timestamp */ 2492b5faa4cSJesper Derehag put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 2502b5faa4cSJesper Derehag ev->what = PROC_EVENT_COREDUMP; 2512b5faa4cSJesper Derehag ev->event_data.coredump.process_pid = task->pid; 2522b5faa4cSJesper Derehag ev->event_data.coredump.process_tgid = task->tgid; 2532b5faa4cSJesper Derehag 2542b5faa4cSJesper Derehag memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 2552b5faa4cSJesper Derehag msg->ack = 0; /* not used */ 2562b5faa4cSJesper Derehag msg->len = sizeof(*ev); 2572b5faa4cSJesper Derehag cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 2582b5faa4cSJesper Derehag } 2592b5faa4cSJesper Derehag 2609f46080cSMatt Helsley void proc_exit_connector(struct task_struct *task) 2619f46080cSMatt Helsley { 2629f46080cSMatt Helsley struct cn_msg *msg; 2639f46080cSMatt Helsley struct proc_event *ev; 2649f46080cSMatt Helsley __u8 buffer[CN_PROC_MSG_SIZE]; 265822cfbffSChandra Seetharaman struct timespec ts; 2669f46080cSMatt Helsley 2679f46080cSMatt Helsley if (atomic_read(&proc_event_num_listeners) < 1) 2689f46080cSMatt Helsley return; 2699f46080cSMatt Helsley 2709f46080cSMatt Helsley msg = (struct cn_msg *)buffer; 2719f46080cSMatt Helsley ev = (struct proc_event *)msg->data; 2729f46080cSMatt Helsley get_seq(&msg->seq, &ev->cpu); 273822cfbffSChandra Seetharaman ktime_get_ts(&ts); /* get high res monotonic timestamp */ 274af3e095aSErik Jacobson put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 2759f46080cSMatt Helsley ev->what = PROC_EVENT_EXIT; 2769f46080cSMatt Helsley ev->event_data.exit.process_pid = task->pid; 2779f46080cSMatt Helsley ev->event_data.exit.process_tgid = task->tgid; 2789f46080cSMatt Helsley ev->event_data.exit.exit_code = task->exit_code; 2799f46080cSMatt Helsley ev->event_data.exit.exit_signal = task->exit_signal; 2809f46080cSMatt Helsley 2819f46080cSMatt Helsley memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 2829f46080cSMatt Helsley msg->ack = 0; /* not used */ 2839f46080cSMatt Helsley msg->len = sizeof(*ev); 2849f46080cSMatt Helsley cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 2859f46080cSMatt Helsley } 2869f46080cSMatt Helsley 2879f46080cSMatt Helsley /* 2889f46080cSMatt Helsley * Send an acknowledgement message to userspace 2899f46080cSMatt Helsley * 2909f46080cSMatt Helsley * Use 0 for success, EFOO otherwise. 2919f46080cSMatt Helsley * Note: this is the negative of conventional kernel error 2929f46080cSMatt Helsley * values because it's not being returned via syscall return 2939f46080cSMatt Helsley * mechanisms. 2949f46080cSMatt Helsley */ 2959f46080cSMatt Helsley static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack) 2969f46080cSMatt Helsley { 2979f46080cSMatt Helsley struct cn_msg *msg; 2989f46080cSMatt Helsley struct proc_event *ev; 2999f46080cSMatt Helsley __u8 buffer[CN_PROC_MSG_SIZE]; 300822cfbffSChandra Seetharaman struct timespec ts; 3019f46080cSMatt Helsley 3029f46080cSMatt Helsley if (atomic_read(&proc_event_num_listeners) < 1) 3039f46080cSMatt Helsley return; 3049f46080cSMatt Helsley 3059f46080cSMatt Helsley msg = (struct cn_msg *)buffer; 3069f46080cSMatt Helsley ev = (struct proc_event *)msg->data; 3079f46080cSMatt Helsley msg->seq = rcvd_seq; 308822cfbffSChandra Seetharaman ktime_get_ts(&ts); /* get high res monotonic timestamp */ 309af3e095aSErik Jacobson put_unaligned(timespec_to_ns(&ts), (__u64 *)&ev->timestamp_ns); 3109f46080cSMatt Helsley ev->cpu = -1; 3119f46080cSMatt Helsley ev->what = PROC_EVENT_NONE; 3129f46080cSMatt Helsley ev->event_data.ack.err = err; 3139f46080cSMatt Helsley memcpy(&msg->id, &cn_proc_event_id, sizeof(msg->id)); 3149f46080cSMatt Helsley msg->ack = rcvd_ack + 1; 3159f46080cSMatt Helsley msg->len = sizeof(*ev); 3169f46080cSMatt Helsley cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL); 3179f46080cSMatt Helsley } 3189f46080cSMatt Helsley 3199f46080cSMatt Helsley /** 3209f46080cSMatt Helsley * cn_proc_mcast_ctl 3219f46080cSMatt Helsley * @data: message sent from userspace via the connector 3229f46080cSMatt Helsley */ 323f0b25932SStephen Boyd static void cn_proc_mcast_ctl(struct cn_msg *msg, 324f0b25932SStephen Boyd struct netlink_skb_parms *nsp) 3259f46080cSMatt Helsley { 3269f46080cSMatt Helsley enum proc_cn_mcast_op *mc_op = NULL; 3279f46080cSMatt Helsley int err = 0; 3289f46080cSMatt Helsley 3299f46080cSMatt Helsley if (msg->len != sizeof(*mc_op)) 3309f46080cSMatt Helsley return; 3319f46080cSMatt Helsley 3329582d901SEric W. Biederman /* 3339582d901SEric W. Biederman * Events are reported with respect to the initial pid 3349582d901SEric W. Biederman * and user namespaces so ignore requestors from 3359582d901SEric W. Biederman * other namespaces. 3369582d901SEric W. Biederman */ 3379582d901SEric W. Biederman if ((current_user_ns() != &init_user_ns) || 3389582d901SEric W. Biederman (task_active_pid_ns(current) != &init_pid_ns)) 3399582d901SEric W. Biederman return; 3409582d901SEric W. Biederman 341e70ab977SKees Cook /* Can only change if privileged. */ 342e70ab977SKees Cook if (!capable(CAP_NET_ADMIN)) { 343e70ab977SKees Cook err = EPERM; 344e70ab977SKees Cook goto out; 345e70ab977SKees Cook } 346e70ab977SKees Cook 3479f46080cSMatt Helsley mc_op = (enum proc_cn_mcast_op *)msg->data; 3489f46080cSMatt Helsley switch (*mc_op) { 3499f46080cSMatt Helsley case PROC_CN_MCAST_LISTEN: 3509f46080cSMatt Helsley atomic_inc(&proc_event_num_listeners); 3519f46080cSMatt Helsley break; 3529f46080cSMatt Helsley case PROC_CN_MCAST_IGNORE: 3539f46080cSMatt Helsley atomic_dec(&proc_event_num_listeners); 3549f46080cSMatt Helsley break; 3559f46080cSMatt Helsley default: 3569f46080cSMatt Helsley err = EINVAL; 3579f46080cSMatt Helsley break; 3589f46080cSMatt Helsley } 359e70ab977SKees Cook 360e70ab977SKees Cook out: 3619f46080cSMatt Helsley cn_proc_ack(err, msg->seq, msg->ack); 3629f46080cSMatt Helsley } 3639f46080cSMatt Helsley 3649f46080cSMatt Helsley /* 3659f46080cSMatt Helsley * cn_proc_init - initialization entry point 3669f46080cSMatt Helsley * 3679f46080cSMatt Helsley * Adds the connector callback to the connector driver. 3689f46080cSMatt Helsley */ 3699f46080cSMatt Helsley static int __init cn_proc_init(void) 3709f46080cSMatt Helsley { 371f3c48eccSValentin Ilie int err = cn_add_callback(&cn_proc_event_id, 372f3c48eccSValentin Ilie "cn_proc", 373f3c48eccSValentin Ilie &cn_proc_mcast_ctl); 374f3c48eccSValentin Ilie if (err) { 375f3c48eccSValentin Ilie pr_warn("cn_proc failed to register\n"); 3769f46080cSMatt Helsley return err; 3779f46080cSMatt Helsley } 3789f46080cSMatt Helsley return 0; 3799f46080cSMatt Helsley } 3809f46080cSMatt Helsley 3819f46080cSMatt Helsley module_init(cn_proc_init); 382