v4.19.13 snapshot.
diff --git a/fs/proc/array.c b/fs/proc/array.c
new file mode 100644
index 0000000..0ceb3b6
--- /dev/null
+++ b/fs/proc/array.c
@@ -0,0 +1,757 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/proc/array.c
+ *
+ * Copyright (C) 1992 by Linus Torvalds
+ * based on ideas by Darren Senn
+ *
+ * Fixes:
+ * Michael. K. Johnson: stat,statm extensions.
+ * <johnsonm@stolaf.edu>
+ *
+ * Pauline Middelink : Made cmdline,envline only break at '\0's, to
+ * make sure SET_PROCTITLE works. Also removed
+ * bad '!' which forced address recalculation for
+ * EVERY character on the current page.
+ * <middelin@polyware.iaf.nl>
+ *
+ * Danny ter Haar : added cpuinfo
+ * <dth@cistron.nl>
+ *
+ * Alessandro Rubini : profile extension.
+ * <rubini@ipvvis.unipv.it>
+ *
+ * Jeff Tranter : added BogoMips field to cpuinfo
+ * <Jeff_Tranter@Mitel.COM>
+ *
+ * Bruno Haible : remove 4K limit for the maps file
+ * <haible@ma2s2.mathematik.uni-karlsruhe.de>
+ *
+ * Yves Arrouye : remove removal of trailing spaces in get_array.
+ * <Yves.Arrouye@marin.fdn.fr>
+ *
+ * Jerome Forissier : added per-CPU time information to /proc/stat
+ * and /proc/<pid>/cpu extension
+ * <forissier@isia.cma.fr>
+ * - Incorporation and non-SMP safe operation
+ * of forissier patch in 2.1.78 by
+ * Hans Marcus <crowbar@concepts.nl>
+ *
+ * aeb@cwi.nl : /proc/partitions
+ *
+ *
+ * Alan Cox : security fixes.
+ * <alan@lxorguk.ukuu.org.uk>
+ *
+ * Al Viro : safe handling of mm_struct
+ *
+ * Gerhard Wichert : added BIGMEM support
+ * Siemens AG <Gerhard.Wichert@pdb.siemens.de>
+ *
+ * Al Viro & Jeff Garzik : moved most of the thing into base.c and
+ * : proc_misc.c. The rest may eventually go into
+ * : base.c too.
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/kernel_stat.h>
+#include <linux/tty.h>
+#include <linux/string.h>
+#include <linux/mman.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/numa_balancing.h>
+#include <linux/sched/task_stack.h>
+#include <linux/sched/task.h>
+#include <linux/sched/cputime.h>
+#include <linux/proc_fs.h>
+#include <linux/ioport.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/hugetlb.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/signal.h>
+#include <linux/highmem.h>
+#include <linux/file.h>
+#include <linux/fdtable.h>
+#include <linux/times.h>
+#include <linux/cpuset.h>
+#include <linux/rcupdate.h>
+#include <linux/delayacct.h>
+#include <linux/seq_file.h>
+#include <linux/pid_namespace.h>
+#include <linux/prctl.h>
+#include <linux/ptrace.h>
+#include <linux/tracehook.h>
+#include <linux/string_helpers.h>
+#include <linux/user_namespace.h>
+#include <linux/fs_struct.h>
+
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include "internal.h"
+
+void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
+{
+ char *buf;
+ size_t size;
+ char tcomm[64];
+ int ret;
+
+ if (p->flags & PF_WQ_WORKER)
+ wq_worker_comm(tcomm, sizeof(tcomm), p);
+ else
+ __get_task_comm(tcomm, sizeof(tcomm), p);
+
+ size = seq_get_buf(m, &buf);
+ if (escape) {
+ ret = string_escape_str(tcomm, buf, size,
+ ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
+ if (ret >= size)
+ ret = -1;
+ } else {
+ ret = strscpy(buf, tcomm, size);
+ }
+
+ seq_commit(m, ret);
+}
+
+/*
+ * The task state array is a strange "bitmap" of
+ * reasons to sleep. Thus "running" is zero, and
+ * you can test for combinations of others with
+ * simple bit tests.
+ */
+static const char * const task_state_array[] = {
+
+ /* states in TASK_REPORT: */
+ "R (running)", /* 0x00 */
+ "S (sleeping)", /* 0x01 */
+ "D (disk sleep)", /* 0x02 */
+ "T (stopped)", /* 0x04 */
+ "t (tracing stop)", /* 0x08 */
+ "X (dead)", /* 0x10 */
+ "Z (zombie)", /* 0x20 */
+ "P (parked)", /* 0x40 */
+
+ /* states beyond TASK_REPORT: */
+ "I (idle)", /* 0x80 */
+};
+
+static inline const char *get_task_state(struct task_struct *tsk)
+{
+ BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
+ return task_state_array[task_state_index(tsk)];
+}
+
+static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *p)
+{
+ struct user_namespace *user_ns = seq_user_ns(m);
+ struct group_info *group_info;
+ int g, umask = -1;
+ struct task_struct *tracer;
+ const struct cred *cred;
+ pid_t ppid, tpid = 0, tgid, ngid;
+ unsigned int max_fds = 0;
+
+ rcu_read_lock();
+ ppid = pid_alive(p) ?
+ task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
+
+ tracer = ptrace_parent(p);
+ if (tracer)
+ tpid = task_pid_nr_ns(tracer, ns);
+
+ tgid = task_tgid_nr_ns(p, ns);
+ ngid = task_numa_group_id(p);
+ cred = get_task_cred(p);
+
+ task_lock(p);
+ if (p->fs)
+ umask = p->fs->umask;
+ if (p->files)
+ max_fds = files_fdtable(p->files)->max_fds;
+ task_unlock(p);
+ rcu_read_unlock();
+
+ if (umask >= 0)
+ seq_printf(m, "Umask:\t%#04o\n", umask);
+ seq_puts(m, "State:\t");
+ seq_puts(m, get_task_state(p));
+
+ seq_put_decimal_ull(m, "\nTgid:\t", tgid);
+ seq_put_decimal_ull(m, "\nNgid:\t", ngid);
+ seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
+ seq_put_decimal_ull(m, "\nPPid:\t", ppid);
+ seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
+ seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
+ seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
+ seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
+ seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
+ seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
+ seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
+ seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
+ seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
+ seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
+
+ seq_puts(m, "\nGroups:\t");
+ group_info = cred->group_info;
+ for (g = 0; g < group_info->ngroups; g++)
+ seq_put_decimal_ull(m, g ? " " : "",
+ from_kgid_munged(user_ns, group_info->gid[g]));
+ put_cred(cred);
+ /* Trailing space shouldn't have been added in the first place. */
+ seq_putc(m, ' ');
+
+#ifdef CONFIG_PID_NS
+ seq_puts(m, "\nNStgid:");
+ for (g = ns->level; g <= pid->level; g++)
+ seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
+ seq_puts(m, "\nNSpid:");
+ for (g = ns->level; g <= pid->level; g++)
+ seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
+ seq_puts(m, "\nNSpgid:");
+ for (g = ns->level; g <= pid->level; g++)
+ seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
+ seq_puts(m, "\nNSsid:");
+ for (g = ns->level; g <= pid->level; g++)
+ seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
+#endif
+ seq_putc(m, '\n');
+}
+
+void render_sigset_t(struct seq_file *m, const char *header,
+ sigset_t *set)
+{
+ int i;
+
+ seq_puts(m, header);
+
+ i = _NSIG;
+ do {
+ int x = 0;
+
+ i -= 4;
+ if (sigismember(set, i+1)) x |= 1;
+ if (sigismember(set, i+2)) x |= 2;
+ if (sigismember(set, i+3)) x |= 4;
+ if (sigismember(set, i+4)) x |= 8;
+ seq_putc(m, hex_asc[x]);
+ } while (i >= 4);
+
+ seq_putc(m, '\n');
+}
+
+static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
+ sigset_t *catch)
+{
+ struct k_sigaction *k;
+ int i;
+
+ k = p->sighand->action;
+ for (i = 1; i <= _NSIG; ++i, ++k) {
+ if (k->sa.sa_handler == SIG_IGN)
+ sigaddset(ign, i);
+ else if (k->sa.sa_handler != SIG_DFL)
+ sigaddset(catch, i);
+ }
+}
+
+static inline void task_sig(struct seq_file *m, struct task_struct *p)
+{
+ unsigned long flags;
+ sigset_t pending, shpending, blocked, ignored, caught;
+ int num_threads = 0;
+ unsigned int qsize = 0;
+ unsigned long qlim = 0;
+
+ sigemptyset(&pending);
+ sigemptyset(&shpending);
+ sigemptyset(&blocked);
+ sigemptyset(&ignored);
+ sigemptyset(&caught);
+
+ if (lock_task_sighand(p, &flags)) {
+ pending = p->pending.signal;
+ shpending = p->signal->shared_pending.signal;
+ blocked = p->blocked;
+ collect_sigign_sigcatch(p, &ignored, &caught);
+ num_threads = get_nr_threads(p);
+ rcu_read_lock(); /* FIXME: is this correct? */
+ qsize = atomic_read(&__task_cred(p)->user->sigpending);
+ rcu_read_unlock();
+ qlim = task_rlimit(p, RLIMIT_SIGPENDING);
+ unlock_task_sighand(p, &flags);
+ }
+
+ seq_put_decimal_ull(m, "Threads:\t", num_threads);
+ seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
+ seq_put_decimal_ull(m, "/", qlim);
+
+ /* render them all */
+ render_sigset_t(m, "\nSigPnd:\t", &pending);
+ render_sigset_t(m, "ShdPnd:\t", &shpending);
+ render_sigset_t(m, "SigBlk:\t", &blocked);
+ render_sigset_t(m, "SigIgn:\t", &ignored);
+ render_sigset_t(m, "SigCgt:\t", &caught);
+}
+
+static void render_cap_t(struct seq_file *m, const char *header,
+ kernel_cap_t *a)
+{
+ unsigned __capi;
+
+ seq_puts(m, header);
+ CAP_FOR_EACH_U32(__capi) {
+ seq_put_hex_ll(m, NULL,
+ a->cap[CAP_LAST_U32 - __capi], 8);
+ }
+ seq_putc(m, '\n');
+}
+
+static inline void task_cap(struct seq_file *m, struct task_struct *p)
+{
+ const struct cred *cred;
+ kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
+ cap_bset, cap_ambient;
+
+ rcu_read_lock();
+ cred = __task_cred(p);
+ cap_inheritable = cred->cap_inheritable;
+ cap_permitted = cred->cap_permitted;
+ cap_effective = cred->cap_effective;
+ cap_bset = cred->cap_bset;
+ cap_ambient = cred->cap_ambient;
+ rcu_read_unlock();
+
+ render_cap_t(m, "CapInh:\t", &cap_inheritable);
+ render_cap_t(m, "CapPrm:\t", &cap_permitted);
+ render_cap_t(m, "CapEff:\t", &cap_effective);
+ render_cap_t(m, "CapBnd:\t", &cap_bset);
+ render_cap_t(m, "CapAmb:\t", &cap_ambient);
+}
+
+static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
+{
+ seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
+#ifdef CONFIG_SECCOMP
+ seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
+#endif
+ seq_printf(m, "\nSpeculation_Store_Bypass:\t");
+ switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
+ case -EINVAL:
+ seq_printf(m, "unknown");
+ break;
+ case PR_SPEC_NOT_AFFECTED:
+ seq_printf(m, "not vulnerable");
+ break;
+ case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
+ seq_printf(m, "thread force mitigated");
+ break;
+ case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
+ seq_printf(m, "thread mitigated");
+ break;
+ case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
+ seq_printf(m, "thread vulnerable");
+ break;
+ case PR_SPEC_DISABLE:
+ seq_printf(m, "globally mitigated");
+ break;
+ default:
+ seq_printf(m, "vulnerable");
+ break;
+ }
+ seq_putc(m, '\n');
+}
+
+static inline void task_context_switch_counts(struct seq_file *m,
+ struct task_struct *p)
+{
+ seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
+ seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
+ seq_putc(m, '\n');
+}
+
+static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
+{
+ seq_printf(m, "Cpus_allowed:\t%*pb\n",
+ cpumask_pr_args(&task->cpus_allowed));
+ seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
+ cpumask_pr_args(&task->cpus_allowed));
+}
+
+static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm)
+{
+ seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state);
+ seq_putc(m, '\n');
+}
+
+int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ struct mm_struct *mm = get_task_mm(task);
+
+ seq_puts(m, "Name:\t");
+ proc_task_name(m, task, true);
+ seq_putc(m, '\n');
+
+ task_state(m, ns, pid, task);
+
+ if (mm) {
+ task_mem(m, mm);
+ task_core_dumping(m, mm);
+ mmput(mm);
+ }
+ task_sig(m, task);
+ task_cap(m, task);
+ task_seccomp(m, task);
+ task_cpus_allowed(m, task);
+ cpuset_task_status_allowed(m, task);
+ task_context_switch_counts(m, task);
+ return 0;
+}
+
+static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task, int whole)
+{
+ unsigned long vsize, eip, esp, wchan = 0;
+ int priority, nice;
+ int tty_pgrp = -1, tty_nr = 0;
+ sigset_t sigign, sigcatch;
+ char state;
+ pid_t ppid = 0, pgid = -1, sid = -1;
+ int num_threads = 0;
+ int permitted;
+ struct mm_struct *mm;
+ unsigned long long start_time;
+ unsigned long cmin_flt = 0, cmaj_flt = 0;
+ unsigned long min_flt = 0, maj_flt = 0;
+ u64 cutime, cstime, utime, stime;
+ u64 cgtime, gtime;
+ unsigned long rsslim = 0;
+ unsigned long flags;
+
+ state = *get_task_state(task);
+ vsize = eip = esp = 0;
+ permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
+ mm = get_task_mm(task);
+ if (mm) {
+ vsize = task_vsize(mm);
+ /*
+ * esp and eip are intentionally zeroed out. There is no
+ * non-racy way to read them without freezing the task.
+ * Programs that need reliable values can use ptrace(2).
+ *
+ * The only exception is if the task is core dumping because
+ * a program is not able to use ptrace(2) in that case. It is
+ * safe because the task has stopped executing permanently.
+ */
+ if (permitted && (task->flags & PF_DUMPCORE)) {
+ if (try_get_task_stack(task)) {
+ eip = KSTK_EIP(task);
+ esp = KSTK_ESP(task);
+ put_task_stack(task);
+ }
+ }
+ }
+
+ sigemptyset(&sigign);
+ sigemptyset(&sigcatch);
+ cutime = cstime = utime = stime = 0;
+ cgtime = gtime = 0;
+
+ if (lock_task_sighand(task, &flags)) {
+ struct signal_struct *sig = task->signal;
+
+ if (sig->tty) {
+ struct pid *pgrp = tty_get_pgrp(sig->tty);
+ tty_pgrp = pid_nr_ns(pgrp, ns);
+ put_pid(pgrp);
+ tty_nr = new_encode_dev(tty_devnum(sig->tty));
+ }
+
+ num_threads = get_nr_threads(task);
+ collect_sigign_sigcatch(task, &sigign, &sigcatch);
+
+ cmin_flt = sig->cmin_flt;
+ cmaj_flt = sig->cmaj_flt;
+ cutime = sig->cutime;
+ cstime = sig->cstime;
+ cgtime = sig->cgtime;
+ rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
+
+ /* add up live thread stats at the group level */
+ if (whole) {
+ struct task_struct *t = task;
+ do {
+ min_flt += t->min_flt;
+ maj_flt += t->maj_flt;
+ gtime += task_gtime(t);
+ } while_each_thread(task, t);
+
+ min_flt += sig->min_flt;
+ maj_flt += sig->maj_flt;
+ thread_group_cputime_adjusted(task, &utime, &stime);
+ gtime += sig->gtime;
+ }
+
+ sid = task_session_nr_ns(task, ns);
+ ppid = task_tgid_nr_ns(task->real_parent, ns);
+ pgid = task_pgrp_nr_ns(task, ns);
+
+ unlock_task_sighand(task, &flags);
+ }
+
+ if (permitted && (!whole || num_threads < 2))
+ wchan = get_wchan(task);
+ if (!whole) {
+ min_flt = task->min_flt;
+ maj_flt = task->maj_flt;
+ task_cputime_adjusted(task, &utime, &stime);
+ gtime = task_gtime(task);
+ }
+
+ /* scale priority and nice values from timeslices to -20..20 */
+ /* to make it look like a "normal" Unix priority/nice value */
+ priority = task_prio(task);
+ nice = task_nice(task);
+
+ /* convert nsec -> ticks */
+ start_time = nsec_to_clock_t(task->real_start_time);
+
+ seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
+ seq_puts(m, " (");
+ proc_task_name(m, task, false);
+ seq_puts(m, ") ");
+ seq_putc(m, state);
+ seq_put_decimal_ll(m, " ", ppid);
+ seq_put_decimal_ll(m, " ", pgid);
+ seq_put_decimal_ll(m, " ", sid);
+ seq_put_decimal_ll(m, " ", tty_nr);
+ seq_put_decimal_ll(m, " ", tty_pgrp);
+ seq_put_decimal_ull(m, " ", task->flags);
+ seq_put_decimal_ull(m, " ", min_flt);
+ seq_put_decimal_ull(m, " ", cmin_flt);
+ seq_put_decimal_ull(m, " ", maj_flt);
+ seq_put_decimal_ull(m, " ", cmaj_flt);
+ seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
+ seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
+ seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
+ seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
+ seq_put_decimal_ll(m, " ", priority);
+ seq_put_decimal_ll(m, " ", nice);
+ seq_put_decimal_ll(m, " ", num_threads);
+ seq_put_decimal_ull(m, " ", 0);
+ seq_put_decimal_ull(m, " ", start_time);
+ seq_put_decimal_ull(m, " ", vsize);
+ seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
+ seq_put_decimal_ull(m, " ", rsslim);
+ seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
+ seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
+ seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
+ seq_put_decimal_ull(m, " ", esp);
+ seq_put_decimal_ull(m, " ", eip);
+ /* The signal information here is obsolete.
+ * It must be decimal for Linux 2.0 compatibility.
+ * Use /proc/#/status for real-time signals.
+ */
+ seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
+ seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
+ seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
+ seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
+
+ /*
+ * We used to output the absolute kernel address, but that's an
+ * information leak - so instead we show a 0/1 flag here, to signal
+ * to user-space whether there's a wchan field in /proc/PID/wchan.
+ *
+ * This works with older implementations of procps as well.
+ */
+ if (wchan)
+ seq_puts(m, " 1");
+ else
+ seq_puts(m, " 0");
+
+ seq_put_decimal_ull(m, " ", 0);
+ seq_put_decimal_ull(m, " ", 0);
+ seq_put_decimal_ll(m, " ", task->exit_signal);
+ seq_put_decimal_ll(m, " ", task_cpu(task));
+ seq_put_decimal_ull(m, " ", task->rt_priority);
+ seq_put_decimal_ull(m, " ", task->policy);
+ seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
+ seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
+ seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
+
+ if (mm && permitted) {
+ seq_put_decimal_ull(m, " ", mm->start_data);
+ seq_put_decimal_ull(m, " ", mm->end_data);
+ seq_put_decimal_ull(m, " ", mm->start_brk);
+ seq_put_decimal_ull(m, " ", mm->arg_start);
+ seq_put_decimal_ull(m, " ", mm->arg_end);
+ seq_put_decimal_ull(m, " ", mm->env_start);
+ seq_put_decimal_ull(m, " ", mm->env_end);
+ } else
+ seq_puts(m, " 0 0 0 0 0 0 0");
+
+ if (permitted)
+ seq_put_decimal_ll(m, " ", task->exit_code);
+ else
+ seq_puts(m, " 0");
+
+ seq_putc(m, '\n');
+ if (mm)
+ mmput(mm);
+ return 0;
+}
+
+int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ return do_task_stat(m, ns, pid, task, 0);
+}
+
+int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ return do_task_stat(m, ns, pid, task, 1);
+}
+
+int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
+ struct mm_struct *mm = get_task_mm(task);
+
+ if (mm) {
+ size = task_statm(mm, &shared, &text, &data, &resident);
+ mmput(mm);
+ }
+ /*
+ * For quick read, open code by putting numbers directly
+ * expected format is
+ * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
+ * size, resident, shared, text, data);
+ */
+ seq_put_decimal_ull(m, "", size);
+ seq_put_decimal_ull(m, " ", resident);
+ seq_put_decimal_ull(m, " ", shared);
+ seq_put_decimal_ull(m, " ", text);
+ seq_put_decimal_ull(m, " ", 0);
+ seq_put_decimal_ull(m, " ", data);
+ seq_put_decimal_ull(m, " ", 0);
+ seq_putc(m, '\n');
+
+ return 0;
+}
+
+#ifdef CONFIG_PROC_CHILDREN
+static struct pid *
+get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
+{
+ struct task_struct *start, *task;
+ struct pid *pid = NULL;
+
+ read_lock(&tasklist_lock);
+
+ start = pid_task(proc_pid(inode), PIDTYPE_PID);
+ if (!start)
+ goto out;
+
+ /*
+ * Lets try to continue searching first, this gives
+ * us significant speedup on children-rich processes.
+ */
+ if (pid_prev) {
+ task = pid_task(pid_prev, PIDTYPE_PID);
+ if (task && task->real_parent == start &&
+ !(list_empty(&task->sibling))) {
+ if (list_is_last(&task->sibling, &start->children))
+ goto out;
+ task = list_first_entry(&task->sibling,
+ struct task_struct, sibling);
+ pid = get_pid(task_pid(task));
+ goto out;
+ }
+ }
+
+ /*
+ * Slow search case.
+ *
+ * We might miss some children here if children
+ * are exited while we were not holding the lock,
+ * but it was never promised to be accurate that
+ * much.
+ *
+ * "Just suppose that the parent sleeps, but N children
+ * exit after we printed their tids. Now the slow paths
+ * skips N extra children, we miss N tasks." (c)
+ *
+ * So one need to stop or freeze the leader and all
+ * its children to get a precise result.
+ */
+ list_for_each_entry(task, &start->children, sibling) {
+ if (pos-- == 0) {
+ pid = get_pid(task_pid(task));
+ break;
+ }
+ }
+
+out:
+ read_unlock(&tasklist_lock);
+ return pid;
+}
+
+static int children_seq_show(struct seq_file *seq, void *v)
+{
+ struct inode *inode = file_inode(seq->file);
+
+ seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode)));
+ return 0;
+}
+
+static void *children_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ return get_children_pid(file_inode(seq->file), NULL, *pos);
+}
+
+static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct pid *pid;
+
+ pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
+ put_pid(v);
+
+ ++*pos;
+ return pid;
+}
+
+static void children_seq_stop(struct seq_file *seq, void *v)
+{
+ put_pid(v);
+}
+
+static const struct seq_operations children_seq_ops = {
+ .start = children_seq_start,
+ .next = children_seq_next,
+ .stop = children_seq_stop,
+ .show = children_seq_show,
+};
+
+static int children_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &children_seq_ops);
+}
+
+const struct file_operations proc_tid_children_operations = {
+ .open = children_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+#endif /* CONFIG_PROC_CHILDREN */