| 1 | |
| 2 | |
| 3 | * linux/fs/proc/array.c
|
| 4 | *
|
| 5 | * Copyright (C) 1992 by Linus Torvalds
|
| 6 | * based on ideas by Darren Senn
|
| 7 | *
|
| 8 | * Fixes:
|
| 9 | * Michael. K. Johnson: stat,statm extensions.
|
| 10 | * <[email protected]>
|
| 11 | *
|
| 12 | * Pauline Middelink : Made cmdline,envline only break at '\0's, to
|
| 13 | * make sure SET_PROCTITLE works. Also removed
|
| 14 | * bad '!' which forced address recalculation for
|
| 15 | * EVERY character on the current page.
|
| 16 | * <[email protected]>
|
| 17 | *
|
| 18 | * Danny ter Haar : added cpuinfo
|
| 19 | * <[email protected]>
|
| 20 | *
|
| 21 | * Alessandro Rubini : profile extension.
|
| 22 | * <[email protected]>
|
| 23 | *
|
| 24 | * Jeff Tranter : added BogoMips field to cpuinfo
|
| 25 | * <[email protected]>
|
| 26 | *
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| 27 | * Bruno Haible : remove 4K limit for the maps file
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| 28 | * <[email protected]>
|
| 29 | *
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| 30 | * Yves Arrouye : remove removal of trailing spaces in get_array.
|
| 31 | * <[email protected]>
|
| 32 | *
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| 33 | * Jerome Forissier : added per-CPU time information to /proc/stat
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| 34 | * and /proc/<pid>/cpu extension
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| 35 | * <[email protected]>
|
| 36 | * - Incorporation and non-SMP safe operation
|
| 37 | * of forissier patch in 2.1.78 by
|
| 38 | * Hans Marcus <[email protected]>
|
| 39 | *
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| 40 | * [email protected] : /proc/partitions
|
| 41 | *
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| 42 | *
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| 43 | * Alan Cox : security fixes.
|
| 44 | * <[email protected]>
|
| 45 | *
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| 46 | * Al Viro : safe handling of mm_struct
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| 47 | *
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| 48 | * Gerhard Wichert : added BIGMEM support
|
| 49 | * Siemens AG <[email protected]>
|
| 50 | *
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| 51 | * Al Viro & Jeff Garzik : moved most of the thing into base.c and
|
| 52 | * : proc_misc.c. The rest may eventually go into
|
| 53 | * : base.c too.
|
| 54 |
|
| 55 |
|
| 56 | #include <linux/types.h>
|
| 57 | #include <linux/errno.h>
|
| 58 | #include <linux/time.h>
|
| 59 | #include <linux/time_namespace.h>
|
| 60 | #include <linux/kernel.h>
|
| 61 | #include <linux/kernel_stat.h>
|
| 62 | #include <linux/tty.h>
|
| 63 | #include <linux/string.h>
|
| 64 | #include <linux/mman.h>
|
| 65 | #include <linux/sched/mm.h>
|
| 66 | #include <linux/sched/numa_balancing.h>
|
| 67 | #include <linux/sched/task_stack.h>
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| 68 | #include <linux/sched/task.h>
|
| 69 | #include <linux/sched/cputime.h>
|
| 70 | #include <linux/proc_fs.h>
|
| 71 | #include <linux/ioport.h>
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| 72 | #include <linux/io.h>
|
| 73 | #include <linux/mm.h>
|
| 74 | #include <linux/hugetlb.h>
|
| 75 | #include <linux/pagemap.h>
|
| 76 | #include <linux/swap.h>
|
| 77 | #include <linux/smp.h>
|
| 78 | #include <linux/signal.h>
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| 79 | #include <linux/highmem.h>
|
| 80 | #include <linux/file.h>
|
| 81 | #include <linux/fdtable.h>
|
| 82 | #include <linux/times.h>
|
| 83 | #include <linux/cpuset.h>
|
| 84 | #include <linux/rcupdate.h>
|
| 85 | #include <linux/delayacct.h>
|
| 86 | #include <linux/seq_file.h>
|
| 87 | #include <linux/pid_namespace.h>
|
| 88 | #include <linux/prctl.h>
|
| 89 | #include <linux/ptrace.h>
|
| 90 | #include <linux/string_helpers.h>
|
| 91 | #include <linux/user_namespace.h>
|
| 92 | #include <linux/fs_struct.h>
|
| 93 | #include <linux/kthread.h>
|
| 94 | #include <linux/mmu_context.h>
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| 95 |
|
| 96 | #include <asm/processor.h>
|
| 97 | #include "internal.h"
|
| 98 |
|
| 99 | void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
|
| 100 | {
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| 101 | char tcomm[64];
|
| 102 |
|
| 103 | |
| 104 | * Test before PF_KTHREAD because all workqueue worker threads are
|
| 105 | * kernel threads.
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| 106 |
|
| 107 | if (p->flags & PF_WQ_WORKER)
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| 108 | wq_worker_comm(tcomm, sizeof(tcomm), p);
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| 109 | else if (p->flags & PF_KTHREAD)
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| 110 | get_kthread_comm(tcomm, sizeof(tcomm), p);
|
| 111 | else
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| 112 | get_task_comm(tcomm, p);
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| 113 |
|
| 114 | if (escape)
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| 115 | seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
|
| 116 | else
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| 117 | seq_printf(m, "%.64s", tcomm);
|
| 118 | }
|
| 119 |
|
| 120 | |
| 121 | * The task state array is a strange "bitmap" of
|
| 122 | * reasons to sleep. Thus "running" is zero, and
|
| 123 | * you can test for combinations of others with
|
| 124 | * simple bit tests.
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| 125 |
|
| 126 | static const char * const task_state_array[] = {
|
| 127 |
|
| 128 |
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| 129 | "R (running)",
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| 130 | "S (sleeping)",
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| 131 | "D (disk sleep)",
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| 132 | "T (stopped)",
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| 133 | "t (tracing stop)",
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| 134 | "X (dead)",
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| 135 | "Z (zombie)",
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| 136 | "P (parked)",
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| 137 |
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| 138 |
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| 139 | "I (idle)",
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| 140 | };
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| 141 |
|
| 142 | static inline const char *get_task_state(struct task_struct *tsk)
|
| 143 | {
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| 144 | BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
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| 145 | return task_state_array[task_state_index(tsk)];
|
| 146 | }
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| 147 |
|
| 148 | static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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| 149 | struct pid *pid, struct task_struct *p)
|
| 150 | {
|
| 151 | struct user_namespace *user_ns = seq_user_ns(m);
|
| 152 | struct group_info *group_info;
|
| 153 | int g, umask = -1;
|
| 154 | struct task_struct *tracer;
|
| 155 | const struct cred *cred;
|
| 156 | pid_t ppid, tpid = 0, tgid, ngid;
|
| 157 | unsigned int max_fds = 0;
|
| 158 |
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| 159 | rcu_read_lock();
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| 160 | ppid = pid_alive(p) ?
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| 161 | task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
|
| 162 |
|
| 163 | tracer = ptrace_parent(p);
|
| 164 | if (tracer)
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| 165 | tpid = task_pid_nr_ns(tracer, ns);
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| 166 |
|
| 167 | tgid = task_tgid_nr_ns(p, ns);
|
| 168 | ngid = task_numa_group_id(p);
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| 169 | cred = get_task_cred(p);
|
| 170 |
|
| 171 | task_lock(p);
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| 172 | if (p->fs)
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| 173 | umask = p->fs->umask;
|
| 174 | if (p->files)
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| 175 | max_fds = files_fdtable(p->files)->max_fds;
|
| 176 | task_unlock(p);
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| 177 | rcu_read_unlock();
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| 178 |
|
| 179 | if (umask >= 0)
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| 180 | seq_printf(m, "Umask:\t%#04o\n", umask);
|
| 181 | seq_puts(m, "State:\t");
|
| 182 | seq_puts(m, get_task_state(p));
|
| 183 |
|
| 184 | seq_put_decimal_ull(m, "\nTgid:\t", tgid);
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| 185 | seq_put_decimal_ull(m, "\nNgid:\t", ngid);
|
| 186 | seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
|
| 187 | seq_put_decimal_ull(m, "\nPPid:\t", ppid);
|
| 188 | seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
|
| 189 | seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
|
| 190 | seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
|
| 191 | seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
|
| 192 | seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
|
| 193 | seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
|
| 194 | seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
|
| 195 | seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
|
| 196 | seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
|
| 197 | seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
|
| 198 |
|
| 199 | seq_puts(m, "\nGroups:\t");
|
| 200 | group_info = cred->group_info;
|
| 201 | for (g = 0; g < group_info->ngroups; g++)
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| 202 | seq_put_decimal_ull(m, g ? " " : "",
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| 203 | from_kgid_munged(user_ns, group_info->gid[g]));
|
| 204 | put_cred(cred);
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| 205 |
|
| 206 | seq_putc(m, ' ');
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| 207 |
|
| 208 | #ifdef CONFIG_PID_NS
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| 209 | seq_puts(m, "\nNStgid:");
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| 210 | for (g = ns->level; g <= pid->level; g++)
|
| 211 | seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
|
| 212 | seq_puts(m, "\nNSpid:");
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| 213 | for (g = ns->level; g <= pid->level; g++)
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| 214 | seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
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| 215 | seq_puts(m, "\nNSpgid:");
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| 216 | for (g = ns->level; g <= pid->level; g++)
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| 217 | seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
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| 218 | seq_puts(m, "\nNSsid:");
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| 219 | for (g = ns->level; g <= pid->level; g++)
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| 220 | seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
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| 221 | #endif
|
| 222 | seq_putc(m, '\n');
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| 223 |
|
| 224 | seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0');
|
| 225 | }
|
| 226 |
|
| 227 | void render_sigset_t(struct seq_file *m, const char *header,
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| 228 | sigset_t *set)
|
| 229 | {
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| 230 | int i;
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| 231 |
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| 232 | seq_puts(m, header);
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| 233 |
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| 234 | i = _NSIG;
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| 235 | do {
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| 236 | int x = 0;
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| 237 |
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| 238 | i -= 4;
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| 239 | if (sigismember(set, i+1)) x |= 1;
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| 240 | if (sigismember(set, i+2)) x |= 2;
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| 241 | if (sigismember(set, i+3)) x |= 4;
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| 242 | if (sigismember(set, i+4)) x |= 8;
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| 243 | seq_putc(m, hex_asc[x]);
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| 244 | } while (i >= 4);
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| 245 |
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| 246 | seq_putc(m, '\n');
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| 247 | }
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| 248 |
|
| 249 | static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
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| 250 | sigset_t *sigcatch)
|
| 251 | {
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| 252 | struct k_sigaction *k;
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| 253 | int i;
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| 254 |
|
| 255 | k = p->sighand->action;
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| 256 | for (i = 1; i <= _NSIG; ++i, ++k) {
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| 257 | if (k->sa.sa_handler == SIG_IGN)
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| 258 | sigaddset(sigign, i);
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| 259 | else if (k->sa.sa_handler != SIG_DFL)
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| 260 | sigaddset(sigcatch, i);
|
| 261 | }
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| 262 | }
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| 263 |
|
| 264 | static inline void task_sig(struct seq_file *m, struct task_struct *p)
|
| 265 | {
|
| 266 | unsigned long flags;
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| 267 | sigset_t pending, shpending, blocked, ignored, caught;
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| 268 | int num_threads = 0;
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| 269 | unsigned int qsize = 0;
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| 270 | unsigned long qlim = 0;
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| 271 |
|
| 272 | sigemptyset(&pending);
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| 273 | sigemptyset(&shpending);
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| 274 | sigemptyset(&blocked);
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| 275 | sigemptyset(&ignored);
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| 276 | sigemptyset(&caught);
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| 277 |
|
| 278 | if (lock_task_sighand(p, &flags)) {
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| 279 | pending = p->pending.signal;
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| 280 | shpending = p->signal->shared_pending.signal;
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| 281 | blocked = p->blocked;
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| 282 | collect_sigign_sigcatch(p, &ignored, &caught);
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| 283 | num_threads = get_nr_threads(p);
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| 284 | rcu_read_lock();
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| 285 | qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);
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| 286 | rcu_read_unlock();
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| 287 | qlim = task_rlimit(p, RLIMIT_SIGPENDING);
|
| 288 | unlock_task_sighand(p, &flags);
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| 289 | }
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| 290 |
|
| 291 | seq_put_decimal_ull(m, "Threads:\t", num_threads);
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| 292 | seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
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| 293 | seq_put_decimal_ull(m, "/", qlim);
|
| 294 |
|
| 295 |
|
| 296 | render_sigset_t(m, "\nSigPnd:\t", &pending);
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| 297 | render_sigset_t(m, "ShdPnd:\t", &shpending);
|
| 298 | render_sigset_t(m, "SigBlk:\t", &blocked);
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| 299 | render_sigset_t(m, "SigIgn:\t", &ignored);
|
| 300 | render_sigset_t(m, "SigCgt:\t", &caught);
|
| 301 | }
|
| 302 |
|
| 303 | static void render_cap_t(struct seq_file *m, const char *header,
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| 304 | kernel_cap_t *a)
|
| 305 | {
|
| 306 | seq_puts(m, header);
|
| 307 | seq_put_hex_ll(m, NULL, a->val, 16);
|
| 308 | seq_putc(m, '\n');
|
| 309 | }
|
| 310 |
|
| 311 | static inline void task_cap(struct seq_file *m, struct task_struct *p)
|
| 312 | {
|
| 313 | const struct cred *cred;
|
| 314 | kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
|
| 315 | cap_bset, cap_ambient;
|
| 316 |
|
| 317 | rcu_read_lock();
|
| 318 | cred = __task_cred(p);
|
| 319 | cap_inheritable = cred->cap_inheritable;
|
| 320 | cap_permitted = cred->cap_permitted;
|
| 321 | cap_effective = cred->cap_effective;
|
| 322 | cap_bset = cred->cap_bset;
|
| 323 | cap_ambient = cred->cap_ambient;
|
| 324 | rcu_read_unlock();
|
| 325 |
|
| 326 | render_cap_t(m, "CapInh:\t", &cap_inheritable);
|
| 327 | render_cap_t(m, "CapPrm:\t", &cap_permitted);
|
| 328 | render_cap_t(m, "CapEff:\t", &cap_effective);
|
| 329 | render_cap_t(m, "CapBnd:\t", &cap_bset);
|
| 330 | render_cap_t(m, "CapAmb:\t", &cap_ambient);
|
| 331 | }
|
| 332 |
|
| 333 | static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
|
| 334 | {
|
| 335 | seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
|
| 336 | #ifdef CONFIG_SECCOMP
|
| 337 | seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
|
| 338 | #ifdef CONFIG_SECCOMP_FILTER
|
| 339 | seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
|
| 340 | atomic_read(&p->seccomp.filter_count));
|
| 341 | #endif
|
| 342 | #endif
|
| 343 | seq_puts(m, "\nSpeculation_Store_Bypass:\t");
|
| 344 | switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
|
| 345 | case -EINVAL:
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| 346 | seq_puts(m, "unknown");
|
| 347 | break;
|
| 348 | case PR_SPEC_NOT_AFFECTED:
|
| 349 | seq_puts(m, "not vulnerable");
|
| 350 | break;
|
| 351 | case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
|
| 352 | seq_puts(m, "thread force mitigated");
|
| 353 | break;
|
| 354 | case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
|
| 355 | seq_puts(m, "thread mitigated");
|
| 356 | break;
|
| 357 | case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
|
| 358 | seq_puts(m, "thread vulnerable");
|
| 359 | break;
|
| 360 | case PR_SPEC_DISABLE:
|
| 361 | seq_puts(m, "globally mitigated");
|
| 362 | break;
|
| 363 | default:
|
| 364 | seq_puts(m, "vulnerable");
|
| 365 | break;
|
| 366 | }
|
| 367 |
|
| 368 | seq_puts(m, "\nSpeculationIndirectBranch:\t");
|
| 369 | switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
|
| 370 | case -EINVAL:
|
| 371 | seq_puts(m, "unsupported");
|
| 372 | break;
|
| 373 | case PR_SPEC_NOT_AFFECTED:
|
| 374 | seq_puts(m, "not affected");
|
| 375 | break;
|
| 376 | case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
|
| 377 | seq_puts(m, "conditional force disabled");
|
| 378 | break;
|
| 379 | case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
|
| 380 | seq_puts(m, "conditional disabled");
|
| 381 | break;
|
| 382 | case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
|
| 383 | seq_puts(m, "conditional enabled");
|
| 384 | break;
|
| 385 | case PR_SPEC_ENABLE:
|
| 386 | seq_puts(m, "always enabled");
|
| 387 | break;
|
| 388 | case PR_SPEC_DISABLE:
|
| 389 | seq_puts(m, "always disabled");
|
| 390 | break;
|
| 391 | default:
|
| 392 | seq_puts(m, "unknown");
|
| 393 | break;
|
| 394 | }
|
| 395 | seq_putc(m, '\n');
|
| 396 | }
|
| 397 |
|
| 398 | static inline void task_context_switch_counts(struct seq_file *m,
|
| 399 | struct task_struct *p)
|
| 400 | {
|
| 401 | seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
|
| 402 | seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
|
| 403 | seq_putc(m, '\n');
|
| 404 | }
|
| 405 |
|
| 406 | static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
|
| 407 | {
|
| 408 | seq_printf(m, "Cpus_allowed:\t%*pb\n",
|
| 409 | cpumask_pr_args(&task->cpus_mask));
|
| 410 | seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
|
| 411 | cpumask_pr_args(&task->cpus_mask));
|
| 412 | }
|
| 413 |
|
| 414 | static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
|
| 415 | {
|
| 416 | seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state);
|
| 417 | seq_putc(m, '\n');
|
| 418 | }
|
| 419 |
|
| 420 | static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
|
| 421 | {
|
| 422 | bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
|
| 423 |
|
| 424 | if (thp_enabled)
|
| 425 | thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);
|
| 426 | seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
|
| 427 | }
|
| 428 |
|
| 429 | static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)
|
| 430 | {
|
| 431 | seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm));
|
| 432 | }
|
| 433 |
|
| 434 | __weak void arch_proc_pid_thread_features(struct seq_file *m,
|
| 435 | struct task_struct *task)
|
| 436 | {
|
| 437 | }
|
| 438 |
|
| 439 | int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
|
| 440 | struct pid *pid, struct task_struct *task)
|
| 441 | {
|
| 442 | struct mm_struct *mm = get_task_mm(task);
|
| 443 |
|
| 444 | seq_puts(m, "Name:\t");
|
| 445 | proc_task_name(m, task, true);
|
| 446 | seq_putc(m, '\n');
|
| 447 |
|
| 448 | task_state(m, ns, pid, task);
|
| 449 |
|
| 450 | if (mm) {
|
| 451 | task_mem(m, mm);
|
| 452 | task_core_dumping(m, task);
|
| 453 | task_thp_status(m, mm);
|
| 454 | task_untag_mask(m, mm);
|
| 455 | mmput(mm);
|
| 456 | }
|
| 457 | task_sig(m, task);
|
| 458 | task_cap(m, task);
|
| 459 | task_seccomp(m, task);
|
| 460 | task_cpus_allowed(m, task);
|
| 461 | cpuset_task_status_allowed(m, task);
|
| 462 | task_context_switch_counts(m, task);
|
| 463 | arch_proc_pid_thread_features(m, task);
|
| 464 | return 0;
|
| 465 | }
|
| 466 |
|
| 467 | static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
|
| 468 | struct pid *pid, struct task_struct *task, int whole)
|
| 469 | {
|
| 470 | unsigned long vsize, eip, esp, wchan = 0;
|
| 471 | int priority, nice;
|
| 472 | int tty_pgrp = -1, tty_nr = 0;
|
| 473 | sigset_t sigign, sigcatch;
|
| 474 | char state;
|
| 475 | pid_t ppid = 0, pgid = -1, sid = -1;
|
| 476 | int num_threads = 0;
|
| 477 | int permitted;
|
| 478 | struct mm_struct *mm;
|
| 479 | unsigned long long start_time;
|
| 480 | unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt;
|
| 481 | u64 cutime, cstime, cgtime, utime, stime, gtime;
|
| 482 | unsigned long rsslim = 0;
|
| 483 | unsigned long flags;
|
| 484 | int exit_code = task->exit_code;
|
| 485 | struct signal_struct *sig = task->signal;
|
| 486 | unsigned int seq = 1;
|
| 487 |
|
| 488 | state = *get_task_state(task);
|
| 489 | vsize = eip = esp = 0;
|
| 490 | permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
|
| 491 | mm = get_task_mm(task);
|
| 492 | if (mm) {
|
| 493 | vsize = task_vsize(mm);
|
| 494 | |
| 495 | * esp and eip are intentionally zeroed out. There is no
|
| 496 | * non-racy way to read them without freezing the task.
|
| 497 | * Programs that need reliable values can use ptrace(2).
|
| 498 | *
|
| 499 | * The only exception is if the task is core dumping because
|
| 500 | * a program is not able to use ptrace(2) in that case. It is
|
| 501 | * safe because the task has stopped executing permanently.
|
| 502 |
|
| 503 | if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
|
| 504 | if (try_get_task_stack(task)) {
|
| 505 | eip = KSTK_EIP(task);
|
| 506 | esp = KSTK_ESP(task);
|
| 507 | put_task_stack(task);
|
| 508 | }
|
| 509 | }
|
| 510 | }
|
| 511 |
|
| 512 | sigemptyset(&sigign);
|
| 513 | sigemptyset(&sigcatch);
|
| 514 |
|
| 515 | if (lock_task_sighand(task, &flags)) {
|
| 516 | if (sig->tty) {
|
| 517 | struct pid *pgrp = tty_get_pgrp(sig->tty);
|
| 518 | tty_pgrp = pid_nr_ns(pgrp, ns);
|
| 519 | put_pid(pgrp);
|
| 520 | tty_nr = new_encode_dev(tty_devnum(sig->tty));
|
| 521 | }
|
| 522 |
|
| 523 | num_threads = get_nr_threads(task);
|
| 524 | collect_sigign_sigcatch(task, &sigign, &sigcatch);
|
| 525 |
|
| 526 | rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
|
| 527 |
|
| 528 | if (whole) {
|
| 529 | if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
|
| 530 | exit_code = sig->group_exit_code;
|
| 531 | }
|
| 532 |
|
| 533 | sid = task_session_nr_ns(task, ns);
|
| 534 | ppid = task_tgid_nr_ns(task->real_parent, ns);
|
| 535 | pgid = task_pgrp_nr_ns(task, ns);
|
| 536 |
|
| 537 | unlock_task_sighand(task, &flags);
|
| 538 | }
|
| 539 |
|
| 540 | if (permitted && (!whole || num_threads < 2))
|
| 541 | wchan = !task_is_running(task);
|
| 542 |
|
| 543 | do {
|
| 544 | seq++;
|
| 545 | flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
|
| 546 |
|
| 547 | cmin_flt = sig->cmin_flt;
|
| 548 | cmaj_flt = sig->cmaj_flt;
|
| 549 | cutime = sig->cutime;
|
| 550 | cstime = sig->cstime;
|
| 551 | cgtime = sig->cgtime;
|
| 552 |
|
| 553 | if (whole) {
|
| 554 | struct task_struct *t;
|
| 555 |
|
| 556 | min_flt = sig->min_flt;
|
| 557 | maj_flt = sig->maj_flt;
|
| 558 | gtime = sig->gtime;
|
| 559 |
|
| 560 | rcu_read_lock();
|
| 561 | __for_each_thread(sig, t) {
|
| 562 | min_flt += t->min_flt;
|
| 563 | maj_flt += t->maj_flt;
|
| 564 | gtime += task_gtime(t);
|
| 565 | }
|
| 566 | rcu_read_unlock();
|
| 567 | }
|
| 568 | } while (need_seqretry(&sig->stats_lock, seq));
|
| 569 | done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
|
| 570 |
|
| 571 | if (whole) {
|
| 572 | thread_group_cputime_adjusted(task, &utime, &stime);
|
| 573 | } else {
|
| 574 | task_cputime_adjusted(task, &utime, &stime);
|
| 575 | min_flt = task->min_flt;
|
| 576 | maj_flt = task->maj_flt;
|
| 577 | gtime = task_gtime(task);
|
| 578 | }
|
| 579 |
|
| 580 |
|
| 581 |
|
| 582 | priority = task_prio(task);
|
| 583 | nice = task_nice(task);
|
| 584 |
|
| 585 |
|
| 586 | start_time =
|
| 587 | nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
|
| 588 |
|
| 589 | seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
|
| 590 | seq_puts(m, " (");
|
| 591 | proc_task_name(m, task, false);
|
| 592 | seq_puts(m, ") ");
|
| 593 | seq_putc(m, state);
|
| 594 | seq_put_decimal_ll(m, " ", ppid);
|
| 595 | seq_put_decimal_ll(m, " ", pgid);
|
| 596 | seq_put_decimal_ll(m, " ", sid);
|
| 597 | seq_put_decimal_ll(m, " ", tty_nr);
|
| 598 | seq_put_decimal_ll(m, " ", tty_pgrp);
|
| 599 | seq_put_decimal_ull(m, " ", task->flags);
|
| 600 | seq_put_decimal_ull(m, " ", min_flt);
|
| 601 | seq_put_decimal_ull(m, " ", cmin_flt);
|
| 602 | seq_put_decimal_ull(m, " ", maj_flt);
|
| 603 | seq_put_decimal_ull(m, " ", cmaj_flt);
|
| 604 | seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
|
| 605 | seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
|
| 606 | seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
|
| 607 | seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
|
| 608 | seq_put_decimal_ll(m, " ", priority);
|
| 609 | seq_put_decimal_ll(m, " ", nice);
|
| 610 | seq_put_decimal_ll(m, " ", num_threads);
|
| 611 | seq_put_decimal_ull(m, " ", 0);
|
| 612 | seq_put_decimal_ull(m, " ", start_time);
|
| 613 | seq_put_decimal_ull(m, " ", vsize);
|
| 614 | seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
|
| 615 | seq_put_decimal_ull(m, " ", rsslim);
|
| 616 | seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
|
| 617 | seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
|
| 618 | seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
|
| 619 | seq_put_decimal_ull(m, " ", esp);
|
| 620 | seq_put_decimal_ull(m, " ", eip);
|
| 621 | |
| 622 | * It must be decimal for Linux 2.0 compatibility.
|
| 623 | * Use /proc/#/status for real-time signals.
|
| 624 |
|
| 625 | seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
|
| 626 | seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
|
| 627 | seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
|
| 628 | seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
|
| 629 |
|
| 630 | |
| 631 | * We used to output the absolute kernel address, but that's an
|
| 632 | * information leak - so instead we show a 0/1 flag here, to signal
|
| 633 | * to user-space whether there's a wchan field in /proc/PID/wchan.
|
| 634 | *
|
| 635 | * This works with older implementations of procps as well.
|
| 636 |
|
| 637 | seq_put_decimal_ull(m, " ", wchan);
|
| 638 |
|
| 639 | seq_put_decimal_ull(m, " ", 0);
|
| 640 | seq_put_decimal_ull(m, " ", 0);
|
| 641 | seq_put_decimal_ll(m, " ", task->exit_signal);
|
| 642 | seq_put_decimal_ll(m, " ", task_cpu(task));
|
| 643 | seq_put_decimal_ull(m, " ", task->rt_priority);
|
| 644 | seq_put_decimal_ull(m, " ", task->policy);
|
| 645 | seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
|
| 646 | seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
|
| 647 | seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
|
| 648 |
|
| 649 | if (mm && permitted) {
|
| 650 | seq_put_decimal_ull(m, " ", mm->start_data);
|
| 651 | seq_put_decimal_ull(m, " ", mm->end_data);
|
| 652 | seq_put_decimal_ull(m, " ", mm->start_brk);
|
| 653 | seq_put_decimal_ull(m, " ", mm->arg_start);
|
| 654 | seq_put_decimal_ull(m, " ", mm->arg_end);
|
| 655 | seq_put_decimal_ull(m, " ", mm->env_start);
|
| 656 | seq_put_decimal_ull(m, " ", mm->env_end);
|
| 657 | } else
|
| 658 | seq_puts(m, " 0 0 0 0 0 0 0");
|
| 659 |
|
| 660 | if (permitted)
|
| 661 | seq_put_decimal_ll(m, " ", exit_code);
|
| 662 | else
|
| 663 | seq_puts(m, " 0");
|
| 664 |
|
| 665 | seq_putc(m, '\n');
|
| 666 | if (mm)
|
| 667 | mmput(mm);
|
| 668 | return 0;
|
| 669 | }
|
| 670 |
|
| 671 | int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
|
| 672 | struct pid *pid, struct task_struct *task)
|
| 673 | {
|
| 674 | return do_task_stat(m, ns, pid, task, 0);
|
| 675 | }
|
| 676 |
|
| 677 | int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
|
| 678 | struct pid *pid, struct task_struct *task)
|
| 679 | {
|
| 680 | return do_task_stat(m, ns, pid, task, 1);
|
| 681 | }
|
| 682 |
|
| 683 | int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
|
| 684 | struct pid *pid, struct task_struct *task)
|
| 685 | {
|
| 686 | struct mm_struct *mm = get_task_mm(task);
|
| 687 |
|
| 688 | if (mm) {
|
| 689 | unsigned long size;
|
| 690 | unsigned long resident = 0;
|
| 691 | unsigned long shared = 0;
|
| 692 | unsigned long text = 0;
|
| 693 | unsigned long data = 0;
|
| 694 |
|
| 695 | size = task_statm(mm, &shared, &text, &data, &resident);
|
| 696 | mmput(mm);
|
| 697 |
|
| 698 | |
| 699 | * For quick read, open code by putting numbers directly
|
| 700 | * expected format is
|
| 701 | * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
|
| 702 | * size, resident, shared, text, data);
|
| 703 |
|
| 704 | seq_put_decimal_ull(m, "", size);
|
| 705 | seq_put_decimal_ull(m, " ", resident);
|
| 706 | seq_put_decimal_ull(m, " ", shared);
|
| 707 | seq_put_decimal_ull(m, " ", text);
|
| 708 | seq_put_decimal_ull(m, " ", 0);
|
| 709 | seq_put_decimal_ull(m, " ", data);
|
| 710 | seq_put_decimal_ull(m, " ", 0);
|
| 711 | seq_putc(m, '\n');
|
| 712 | } else {
|
| 713 | seq_write(m, "0 0 0 0 0 0 0\n", 14);
|
| 714 | }
|
| 715 | return 0;
|
| 716 | }
|
| 717 |
|
| 718 | #ifdef CONFIG_PROC_CHILDREN
|
| 719 | static struct pid *
|
| 720 | get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
|
| 721 | {
|
| 722 | struct task_struct *start, *task;
|
| 723 | struct pid *pid = NULL;
|
| 724 |
|
| 725 | read_lock(&tasklist_lock);
|
| 726 |
|
| 727 | start = pid_task(proc_pid(inode), PIDTYPE_PID);
|
| 728 | if (!start)
|
| 729 | goto out;
|
| 730 |
|
| 731 | |
| 732 | * Lets try to continue searching first, this gives
|
| 733 | * us significant speedup on children-rich processes.
|
| 734 |
|
| 735 | if (pid_prev) {
|
| 736 | task = pid_task(pid_prev, PIDTYPE_PID);
|
| 737 | if (task && task->real_parent == start &&
|
| 738 | !(list_empty(&task->sibling))) {
|
| 739 | if (list_is_last(&task->sibling, &start->children))
|
| 740 | goto out;
|
| 741 | task = list_first_entry(&task->sibling,
|
| 742 | struct task_struct, sibling);
|
| 743 | pid = get_pid(task_pid(task));
|
| 744 | goto out;
|
| 745 | }
|
| 746 | }
|
| 747 |
|
| 748 | |
| 749 | * Slow search case.
|
| 750 | *
|
| 751 | * We might miss some children here if children
|
| 752 | * are exited while we were not holding the lock,
|
| 753 | * but it was never promised to be accurate that
|
| 754 | * much.
|
| 755 | *
|
| 756 | * "Just suppose that the parent sleeps, but N children
|
| 757 | * exit after we printed their tids. Now the slow paths
|
| 758 | * skips N extra children, we miss N tasks." (c)
|
| 759 | *
|
| 760 | * So one need to stop or freeze the leader and all
|
| 761 | * its children to get a precise result.
|
| 762 |
|
| 763 | list_for_each_entry(task, &start->children, sibling) {
|
| 764 | if (pos-- == 0) {
|
| 765 | pid = get_pid(task_pid(task));
|
| 766 | break;
|
| 767 | }
|
| 768 | }
|
| 769 |
|
| 770 | out:
|
| 771 | read_unlock(&tasklist_lock);
|
| 772 | return pid;
|
| 773 | }
|
| 774 |
|
| 775 | static int children_seq_show(struct seq_file *seq, void *v)
|
| 776 | {
|
| 777 | struct inode *inode = file_inode(seq->file);
|
| 778 |
|
| 779 | seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
|
| 780 | return 0;
|
| 781 | }
|
| 782 |
|
| 783 | static void *children_seq_start(struct seq_file *seq, loff_t *pos)
|
| 784 | {
|
| 785 | return get_children_pid(file_inode(seq->file), NULL, *pos);
|
| 786 | }
|
| 787 |
|
| 788 | static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
| 789 | {
|
| 790 | struct pid *pid;
|
| 791 |
|
| 792 | pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
|
| 793 | put_pid(v);
|
| 794 |
|
| 795 | ++*pos;
|
| 796 | return pid;
|
| 797 | }
|
| 798 |
|
| 799 | static void children_seq_stop(struct seq_file *seq, void *v)
|
| 800 | {
|
| 801 | put_pid(v);
|
| 802 | }
|
| 803 |
|
| 804 | static const struct seq_operations children_seq_ops = {
|
| 805 | .start = children_seq_start,
|
| 806 | .next = children_seq_next,
|
| 807 | .stop = children_seq_stop,
|
| 808 | .show = children_seq_show,
|
| 809 | };
|
| 810 |
|
| 811 | static int children_seq_open(struct inode *inode, struct file *file)
|
| 812 | {
|
| 813 | return seq_open(file, &children_seq_ops);
|
| 814 | }
|
| 815 |
|
| 816 | const struct file_operations proc_tid_children_operations = {
|
| 817 | .open = children_seq_open,
|
| 818 | .read = seq_read,
|
| 819 | .llseek = seq_lseek,
|
| 820 | .release = seq_release,
|
| 821 | };
|
| 822 | #endif
|