4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <asm/uaccess.h>
52 #include <linux/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/task_io_accounting_ops.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/fdtable.h>
61 #include <linux/string.h>
62 #include <linux/seq_file.h>
63 #include <linux/namei.h>
64 #include <linux/mnt_namespace.h>
66 #include <linux/swap.h>
67 #include <linux/rcupdate.h>
68 #include <linux/kallsyms.h>
69 #include <linux/stacktrace.h>
70 #include <linux/resource.h>
71 #include <linux/module.h>
72 #include <linux/mount.h>
73 #include <linux/security.h>
74 #include <linux/ptrace.h>
75 #include <linux/tracehook.h>
76 #include <linux/cgroup.h>
77 #include <linux/cpuset.h>
78 #include <linux/audit.h>
79 #include <linux/poll.h>
80 #include <linux/nsproxy.h>
81 #include <linux/oom.h>
82 #include <linux/elf.h>
83 #include <linux/pid_namespace.h>
84 #include <linux/fs_struct.h>
85 #include <linux/slab.h>
89 * Implementing inode permission operations in /proc is almost
90 * certainly an error. Permission checks need to happen during
91 * each system call not at open time. The reason is that most of
92 * what we wish to check for permissions in /proc varies at runtime.
94 * The classic example of a problem is opening file descriptors
95 * in /proc for a task before it execs a suid executable.
102 const struct inode_operations *iop;
103 const struct file_operations *fop;
107 #define NOD(NAME, MODE, IOP, FOP, OP) { \
109 .len = sizeof(NAME) - 1, \
116 #define DIR(NAME, MODE, iops, fops) \
117 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
118 #define LNK(NAME, get_link) \
119 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
120 &proc_pid_link_inode_operations, NULL, \
121 { .proc_get_link = get_link } )
122 #define REG(NAME, MODE, fops) \
123 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
124 #define INF(NAME, MODE, read) \
125 NOD(NAME, (S_IFREG|(MODE)), \
126 NULL, &proc_info_file_operations, \
127 { .proc_read = read } )
128 #define ONE(NAME, MODE, show) \
129 NOD(NAME, (S_IFREG|(MODE)), \
130 NULL, &proc_single_file_operations, \
131 { .proc_show = show } )
134 * Count the number of hardlinks for the pid_entry table, excluding the .
137 static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
144 for (i = 0; i < n; ++i) {
145 if (S_ISDIR(entries[i].mode))
152 static int get_task_root(struct task_struct *task, struct path *root)
154 int result = -ENOENT;
158 get_fs_root(task->fs, root);
165 static int proc_cwd_link(struct inode *inode, struct path *path)
167 struct task_struct *task = get_proc_task(inode);
168 int result = -ENOENT;
173 get_fs_pwd(task->fs, path);
177 put_task_struct(task);
182 static int proc_root_link(struct inode *inode, struct path *path)
184 struct task_struct *task = get_proc_task(inode);
185 int result = -ENOENT;
188 result = get_task_root(task, path);
189 put_task_struct(task);
195 * Return zero if current may access user memory in @task, -error if not.
197 static int check_mem_permission(struct task_struct *task)
200 * A task can always look at itself, in case it chooses
201 * to use system calls instead of load instructions.
207 * If current is actively ptrace'ing, and would also be
208 * permitted to freshly attach with ptrace now, permit it.
210 if (task_is_stopped_or_traced(task)) {
213 match = (tracehook_tracer_task(task) == current);
215 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
220 * Noone else is allowed.
225 struct mm_struct *mm_for_maps(struct task_struct *task)
227 struct mm_struct *mm;
229 if (mutex_lock_killable(&task->signal->cred_guard_mutex))
232 mm = get_task_mm(task);
233 if (mm && mm != current->mm &&
234 !ptrace_may_access(task, PTRACE_MODE_READ)) {
238 mutex_unlock(&task->signal->cred_guard_mutex);
243 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
247 struct mm_struct *mm = get_task_mm(task);
251 goto out_mm; /* Shh! No looking before we're done */
253 len = mm->arg_end - mm->arg_start;
258 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
260 // If the nul at the end of args has been overwritten, then
261 // assume application is using setproctitle(3).
262 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
263 len = strnlen(buffer, res);
267 len = mm->env_end - mm->env_start;
268 if (len > PAGE_SIZE - res)
269 len = PAGE_SIZE - res;
270 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
271 res = strnlen(buffer, res);
280 static int proc_pid_auxv(struct task_struct *task, char *buffer)
283 struct mm_struct *mm = get_task_mm(task);
285 unsigned int nwords = 0;
288 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
289 res = nwords * sizeof(mm->saved_auxv[0]);
292 memcpy(buffer, mm->saved_auxv, res);
299 #ifdef CONFIG_KALLSYMS
301 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
302 * Returns the resolved symbol. If that fails, simply return the address.
304 static int proc_pid_wchan(struct task_struct *task, char *buffer)
307 char symname[KSYM_NAME_LEN];
309 wchan = get_wchan(task);
311 if (lookup_symbol_name(wchan, symname) < 0)
312 if (!ptrace_may_access(task, PTRACE_MODE_READ))
315 return sprintf(buffer, "%lu", wchan);
317 return sprintf(buffer, "%s", symname);
319 #endif /* CONFIG_KALLSYMS */
321 #ifdef CONFIG_STACKTRACE
323 #define MAX_STACK_TRACE_DEPTH 64
325 static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
326 struct pid *pid, struct task_struct *task)
328 struct stack_trace trace;
329 unsigned long *entries;
332 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
336 trace.nr_entries = 0;
337 trace.max_entries = MAX_STACK_TRACE_DEPTH;
338 trace.entries = entries;
340 save_stack_trace_tsk(task, &trace);
342 for (i = 0; i < trace.nr_entries; i++) {
343 seq_printf(m, "[<%p>] %pS\n",
344 (void *)entries[i], (void *)entries[i]);
352 #ifdef CONFIG_SCHEDSTATS
354 * Provides /proc/PID/schedstat
356 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
358 return sprintf(buffer, "%llu %llu %lu\n",
359 (unsigned long long)task->se.sum_exec_runtime,
360 (unsigned long long)task->sched_info.run_delay,
361 task->sched_info.pcount);
365 #ifdef CONFIG_LATENCYTOP
366 static int lstats_show_proc(struct seq_file *m, void *v)
369 struct inode *inode = m->private;
370 struct task_struct *task = get_proc_task(inode);
374 seq_puts(m, "Latency Top version : v0.1\n");
375 for (i = 0; i < 32; i++) {
376 struct latency_record *lr = &task->latency_record[i];
377 if (lr->backtrace[0]) {
379 seq_printf(m, "%i %li %li",
380 lr->count, lr->time, lr->max);
381 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
382 unsigned long bt = lr->backtrace[q];
387 seq_printf(m, " %ps", (void *)bt);
393 put_task_struct(task);
397 static int lstats_open(struct inode *inode, struct file *file)
399 return single_open(file, lstats_show_proc, inode);
402 static ssize_t lstats_write(struct file *file, const char __user *buf,
403 size_t count, loff_t *offs)
405 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
409 clear_all_latency_tracing(task);
410 put_task_struct(task);
415 static const struct file_operations proc_lstats_operations = {
418 .write = lstats_write,
420 .release = single_release,
425 static int proc_oom_score(struct task_struct *task, char *buffer)
427 unsigned long points = 0;
429 read_lock(&tasklist_lock);
431 points = oom_badness(task, NULL, NULL,
432 totalram_pages + total_swap_pages);
433 read_unlock(&tasklist_lock);
434 return sprintf(buffer, "%lu\n", points);
442 static const struct limit_names lnames[RLIM_NLIMITS] = {
443 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
444 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
445 [RLIMIT_DATA] = {"Max data size", "bytes"},
446 [RLIMIT_STACK] = {"Max stack size", "bytes"},
447 [RLIMIT_CORE] = {"Max core file size", "bytes"},
448 [RLIMIT_RSS] = {"Max resident set", "bytes"},
449 [RLIMIT_NPROC] = {"Max processes", "processes"},
450 [RLIMIT_NOFILE] = {"Max open files", "files"},
451 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
452 [RLIMIT_AS] = {"Max address space", "bytes"},
453 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
454 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
455 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
456 [RLIMIT_NICE] = {"Max nice priority", NULL},
457 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
458 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
461 /* Display limits for a process */
462 static int proc_pid_limits(struct task_struct *task, char *buffer)
467 char *bufptr = buffer;
469 struct rlimit rlim[RLIM_NLIMITS];
471 if (!lock_task_sighand(task, &flags))
473 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
474 unlock_task_sighand(task, &flags);
477 * print the file header
479 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
480 "Limit", "Soft Limit", "Hard Limit", "Units");
482 for (i = 0; i < RLIM_NLIMITS; i++) {
483 if (rlim[i].rlim_cur == RLIM_INFINITY)
484 count += sprintf(&bufptr[count], "%-25s %-20s ",
485 lnames[i].name, "unlimited");
487 count += sprintf(&bufptr[count], "%-25s %-20lu ",
488 lnames[i].name, rlim[i].rlim_cur);
490 if (rlim[i].rlim_max == RLIM_INFINITY)
491 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
493 count += sprintf(&bufptr[count], "%-20lu ",
497 count += sprintf(&bufptr[count], "%-10s\n",
500 count += sprintf(&bufptr[count], "\n");
506 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
507 static int proc_pid_syscall(struct task_struct *task, char *buffer)
510 unsigned long args[6], sp, pc;
512 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
513 return sprintf(buffer, "running\n");
516 return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
518 return sprintf(buffer,
519 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
521 args[0], args[1], args[2], args[3], args[4], args[5],
524 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
526 /************************************************************************/
527 /* Here the fs part begins */
528 /************************************************************************/
530 /* permission checks */
531 static int proc_fd_access_allowed(struct inode *inode)
533 struct task_struct *task;
535 /* Allow access to a task's file descriptors if it is us or we
536 * may use ptrace attach to the process and find out that
539 task = get_proc_task(inode);
541 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
542 put_task_struct(task);
547 static int proc_setattr(struct dentry *dentry, struct iattr *attr)
550 struct inode *inode = dentry->d_inode;
552 if (attr->ia_valid & ATTR_MODE)
555 error = inode_change_ok(inode, attr);
559 if ((attr->ia_valid & ATTR_SIZE) &&
560 attr->ia_size != i_size_read(inode)) {
561 error = vmtruncate(inode, attr->ia_size);
566 setattr_copy(inode, attr);
567 mark_inode_dirty(inode);
571 static const struct inode_operations proc_def_inode_operations = {
572 .setattr = proc_setattr,
575 static int mounts_open_common(struct inode *inode, struct file *file,
576 const struct seq_operations *op)
578 struct task_struct *task = get_proc_task(inode);
580 struct mnt_namespace *ns = NULL;
582 struct proc_mounts *p;
587 nsp = task_nsproxy(task);
594 if (ns && get_task_root(task, &root) == 0)
596 put_task_struct(task);
605 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
609 file->private_data = &p->m;
610 ret = seq_open(file, op);
617 p->event = ns->event;
631 static int mounts_release(struct inode *inode, struct file *file)
633 struct proc_mounts *p = file->private_data;
636 return seq_release(inode, file);
639 static unsigned mounts_poll(struct file *file, poll_table *wait)
641 struct proc_mounts *p = file->private_data;
642 unsigned res = POLLIN | POLLRDNORM;
644 poll_wait(file, &p->ns->poll, wait);
645 if (mnt_had_events(p))
646 res |= POLLERR | POLLPRI;
651 static int mounts_open(struct inode *inode, struct file *file)
653 return mounts_open_common(inode, file, &mounts_op);
656 static const struct file_operations proc_mounts_operations = {
660 .release = mounts_release,
664 static int mountinfo_open(struct inode *inode, struct file *file)
666 return mounts_open_common(inode, file, &mountinfo_op);
669 static const struct file_operations proc_mountinfo_operations = {
670 .open = mountinfo_open,
673 .release = mounts_release,
677 static int mountstats_open(struct inode *inode, struct file *file)
679 return mounts_open_common(inode, file, &mountstats_op);
682 static const struct file_operations proc_mountstats_operations = {
683 .open = mountstats_open,
686 .release = mounts_release,
689 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
691 static ssize_t proc_info_read(struct file * file, char __user * buf,
692 size_t count, loff_t *ppos)
694 struct inode * inode = file->f_path.dentry->d_inode;
697 struct task_struct *task = get_proc_task(inode);
703 if (count > PROC_BLOCK_SIZE)
704 count = PROC_BLOCK_SIZE;
707 if (!(page = __get_free_page(GFP_TEMPORARY)))
710 length = PROC_I(inode)->op.proc_read(task, (char*)page);
713 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
716 put_task_struct(task);
721 static const struct file_operations proc_info_file_operations = {
722 .read = proc_info_read,
723 .llseek = generic_file_llseek,
726 static int proc_single_show(struct seq_file *m, void *v)
728 struct inode *inode = m->private;
729 struct pid_namespace *ns;
731 struct task_struct *task;
734 ns = inode->i_sb->s_fs_info;
735 pid = proc_pid(inode);
736 task = get_pid_task(pid, PIDTYPE_PID);
740 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
742 put_task_struct(task);
746 static int proc_single_open(struct inode *inode, struct file *filp)
749 ret = single_open(filp, proc_single_show, NULL);
751 struct seq_file *m = filp->private_data;
758 static const struct file_operations proc_single_file_operations = {
759 .open = proc_single_open,
762 .release = single_release,
765 static int mem_open(struct inode* inode, struct file* file)
767 file->private_data = (void*)((long)current->self_exec_id);
768 /* OK to pass negative loff_t, we can catch out-of-range */
769 file->f_mode |= FMODE_UNSIGNED_OFFSET;
773 static ssize_t mem_read(struct file * file, char __user * buf,
774 size_t count, loff_t *ppos)
776 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
778 unsigned long src = *ppos;
780 struct mm_struct *mm;
785 if (check_mem_permission(task))
789 page = (char *)__get_free_page(GFP_TEMPORARY);
795 mm = get_task_mm(task);
801 if (file->private_data != (void*)((long)current->self_exec_id))
807 int this_len, retval;
809 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
810 retval = access_process_vm(task, src, page, this_len, 0);
811 if (!retval || check_mem_permission(task)) {
817 if (copy_to_user(buf, page, retval)) {
832 free_page((unsigned long) page);
834 put_task_struct(task);
839 #define mem_write NULL
842 /* This is a security hazard */
843 static ssize_t mem_write(struct file * file, const char __user *buf,
844 size_t count, loff_t *ppos)
848 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
849 unsigned long dst = *ppos;
855 if (check_mem_permission(task))
859 page = (char *)__get_free_page(GFP_TEMPORARY);
865 int this_len, retval;
867 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
868 if (copy_from_user(page, buf, this_len)) {
872 retval = access_process_vm(task, dst, page, this_len, 1);
884 free_page((unsigned long) page);
886 put_task_struct(task);
892 loff_t mem_lseek(struct file *file, loff_t offset, int orig)
896 file->f_pos = offset;
899 file->f_pos += offset;
904 force_successful_syscall_return();
908 static const struct file_operations proc_mem_operations = {
915 static ssize_t environ_read(struct file *file, char __user *buf,
916 size_t count, loff_t *ppos)
918 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
920 unsigned long src = *ppos;
922 struct mm_struct *mm;
927 if (!ptrace_may_access(task, PTRACE_MODE_READ))
931 page = (char *)__get_free_page(GFP_TEMPORARY);
937 mm = get_task_mm(task);
942 int this_len, retval, max_len;
944 this_len = mm->env_end - (mm->env_start + src);
949 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
950 this_len = (this_len > max_len) ? max_len : this_len;
952 retval = access_process_vm(task, (mm->env_start + src),
960 if (copy_to_user(buf, page, retval)) {
974 free_page((unsigned long) page);
976 put_task_struct(task);
981 static const struct file_operations proc_environ_operations = {
982 .read = environ_read,
983 .llseek = generic_file_llseek,
986 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
987 size_t count, loff_t *ppos)
989 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
990 char buffer[PROC_NUMBUF];
992 int oom_adjust = OOM_DISABLE;
998 if (lock_task_sighand(task, &flags)) {
999 oom_adjust = task->signal->oom_adj;
1000 unlock_task_sighand(task, &flags);
1003 put_task_struct(task);
1005 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
1007 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1010 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1011 size_t count, loff_t *ppos)
1013 struct task_struct *task;
1014 char buffer[PROC_NUMBUF];
1016 unsigned long flags;
1019 memset(buffer, 0, sizeof(buffer));
1020 if (count > sizeof(buffer) - 1)
1021 count = sizeof(buffer) - 1;
1022 if (copy_from_user(buffer, buf, count)) {
1027 err = strict_strtol(strstrip(buffer), 0, &oom_adjust);
1030 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
1031 oom_adjust != OOM_DISABLE) {
1036 task = get_proc_task(file->f_path.dentry->d_inode);
1048 if (!lock_task_sighand(task, &flags)) {
1053 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
1058 if (oom_adjust != task->signal->oom_adj) {
1059 if (oom_adjust == OOM_DISABLE)
1060 atomic_inc(&task->mm->oom_disable_count);
1061 if (task->signal->oom_adj == OOM_DISABLE)
1062 atomic_dec(&task->mm->oom_disable_count);
1066 * Warn that /proc/pid/oom_adj is deprecated, see
1067 * Documentation/feature-removal-schedule.txt.
1069 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, "
1070 "please use /proc/%d/oom_score_adj instead.\n",
1071 current->comm, task_pid_nr(current),
1072 task_pid_nr(task), task_pid_nr(task));
1073 task->signal->oom_adj = oom_adjust;
1075 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1076 * value is always attainable.
1078 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1079 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1081 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1084 unlock_task_sighand(task, &flags);
1087 put_task_struct(task);
1089 return err < 0 ? err : count;
1092 static const struct file_operations proc_oom_adjust_operations = {
1093 .read = oom_adjust_read,
1094 .write = oom_adjust_write,
1095 .llseek = generic_file_llseek,
1098 static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1099 size_t count, loff_t *ppos)
1101 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1102 char buffer[PROC_NUMBUF];
1103 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1104 unsigned long flags;
1109 if (lock_task_sighand(task, &flags)) {
1110 oom_score_adj = task->signal->oom_score_adj;
1111 unlock_task_sighand(task, &flags);
1113 put_task_struct(task);
1114 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1115 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1118 static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1119 size_t count, loff_t *ppos)
1121 struct task_struct *task;
1122 char buffer[PROC_NUMBUF];
1123 unsigned long flags;
1127 memset(buffer, 0, sizeof(buffer));
1128 if (count > sizeof(buffer) - 1)
1129 count = sizeof(buffer) - 1;
1130 if (copy_from_user(buffer, buf, count)) {
1135 err = strict_strtol(strstrip(buffer), 0, &oom_score_adj);
1138 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
1139 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1144 task = get_proc_task(file->f_path.dentry->d_inode);
1156 if (!lock_task_sighand(task, &flags)) {
1161 if (oom_score_adj < task->signal->oom_score_adj &&
1162 !capable(CAP_SYS_RESOURCE)) {
1167 if (oom_score_adj != task->signal->oom_score_adj) {
1168 if (oom_score_adj == OOM_SCORE_ADJ_MIN)
1169 atomic_inc(&task->mm->oom_disable_count);
1170 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1171 atomic_dec(&task->mm->oom_disable_count);
1173 task->signal->oom_score_adj = oom_score_adj;
1175 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1176 * always attainable.
1178 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1179 task->signal->oom_adj = OOM_DISABLE;
1181 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1184 unlock_task_sighand(task, &flags);
1187 put_task_struct(task);
1189 return err < 0 ? err : count;
1192 static const struct file_operations proc_oom_score_adj_operations = {
1193 .read = oom_score_adj_read,
1194 .write = oom_score_adj_write,
1195 .llseek = default_llseek,
1198 #ifdef CONFIG_AUDITSYSCALL
1199 #define TMPBUFLEN 21
1200 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1201 size_t count, loff_t *ppos)
1203 struct inode * inode = file->f_path.dentry->d_inode;
1204 struct task_struct *task = get_proc_task(inode);
1206 char tmpbuf[TMPBUFLEN];
1210 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1211 audit_get_loginuid(task));
1212 put_task_struct(task);
1213 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1216 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1217 size_t count, loff_t *ppos)
1219 struct inode * inode = file->f_path.dentry->d_inode;
1224 if (!capable(CAP_AUDIT_CONTROL))
1228 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1234 if (count >= PAGE_SIZE)
1235 count = PAGE_SIZE - 1;
1238 /* No partial writes. */
1241 page = (char*)__get_free_page(GFP_TEMPORARY);
1245 if (copy_from_user(page, buf, count))
1249 loginuid = simple_strtoul(page, &tmp, 10);
1255 length = audit_set_loginuid(current, loginuid);
1256 if (likely(length == 0))
1260 free_page((unsigned long) page);
1264 static const struct file_operations proc_loginuid_operations = {
1265 .read = proc_loginuid_read,
1266 .write = proc_loginuid_write,
1267 .llseek = generic_file_llseek,
1270 static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1271 size_t count, loff_t *ppos)
1273 struct inode * inode = file->f_path.dentry->d_inode;
1274 struct task_struct *task = get_proc_task(inode);
1276 char tmpbuf[TMPBUFLEN];
1280 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1281 audit_get_sessionid(task));
1282 put_task_struct(task);
1283 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1286 static const struct file_operations proc_sessionid_operations = {
1287 .read = proc_sessionid_read,
1288 .llseek = generic_file_llseek,
1292 #ifdef CONFIG_FAULT_INJECTION
1293 static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1294 size_t count, loff_t *ppos)
1296 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1297 char buffer[PROC_NUMBUF];
1303 make_it_fail = task->make_it_fail;
1304 put_task_struct(task);
1306 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
1308 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1311 static ssize_t proc_fault_inject_write(struct file * file,
1312 const char __user * buf, size_t count, loff_t *ppos)
1314 struct task_struct *task;
1315 char buffer[PROC_NUMBUF], *end;
1318 if (!capable(CAP_SYS_RESOURCE))
1320 memset(buffer, 0, sizeof(buffer));
1321 if (count > sizeof(buffer) - 1)
1322 count = sizeof(buffer) - 1;
1323 if (copy_from_user(buffer, buf, count))
1325 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1328 task = get_proc_task(file->f_dentry->d_inode);
1331 task->make_it_fail = make_it_fail;
1332 put_task_struct(task);
1337 static const struct file_operations proc_fault_inject_operations = {
1338 .read = proc_fault_inject_read,
1339 .write = proc_fault_inject_write,
1340 .llseek = generic_file_llseek,
1345 #ifdef CONFIG_SCHED_DEBUG
1347 * Print out various scheduling related per-task fields:
1349 static int sched_show(struct seq_file *m, void *v)
1351 struct inode *inode = m->private;
1352 struct task_struct *p;
1354 p = get_proc_task(inode);
1357 proc_sched_show_task(p, m);
1365 sched_write(struct file *file, const char __user *buf,
1366 size_t count, loff_t *offset)
1368 struct inode *inode = file->f_path.dentry->d_inode;
1369 struct task_struct *p;
1371 p = get_proc_task(inode);
1374 proc_sched_set_task(p);
1381 static int sched_open(struct inode *inode, struct file *filp)
1385 ret = single_open(filp, sched_show, NULL);
1387 struct seq_file *m = filp->private_data;
1394 static const struct file_operations proc_pid_sched_operations = {
1397 .write = sched_write,
1398 .llseek = seq_lseek,
1399 .release = single_release,
1404 #ifdef CONFIG_SCHED_AUTOGROUP
1406 * Print out autogroup related information:
1408 static int sched_autogroup_show(struct seq_file *m, void *v)
1410 struct inode *inode = m->private;
1411 struct task_struct *p;
1413 p = get_proc_task(inode);
1416 proc_sched_autogroup_show_task(p, m);
1424 sched_autogroup_write(struct file *file, const char __user *buf,
1425 size_t count, loff_t *offset)
1427 struct inode *inode = file->f_path.dentry->d_inode;
1428 struct task_struct *p;
1429 char buffer[PROC_NUMBUF];
1433 memset(buffer, 0, sizeof(buffer));
1434 if (count > sizeof(buffer) - 1)
1435 count = sizeof(buffer) - 1;
1436 if (copy_from_user(buffer, buf, count))
1439 err = strict_strtol(strstrip(buffer), 0, &nice);
1443 p = get_proc_task(inode);
1448 err = proc_sched_autogroup_set_nice(p, &err);
1457 static int sched_autogroup_open(struct inode *inode, struct file *filp)
1461 ret = single_open(filp, sched_autogroup_show, NULL);
1463 struct seq_file *m = filp->private_data;
1470 static const struct file_operations proc_pid_sched_autogroup_operations = {
1471 .open = sched_autogroup_open,
1473 .write = sched_autogroup_write,
1474 .llseek = seq_lseek,
1475 .release = single_release,
1478 #endif /* CONFIG_SCHED_AUTOGROUP */
1480 static ssize_t comm_write(struct file *file, const char __user *buf,
1481 size_t count, loff_t *offset)
1483 struct inode *inode = file->f_path.dentry->d_inode;
1484 struct task_struct *p;
1485 char buffer[TASK_COMM_LEN];
1487 memset(buffer, 0, sizeof(buffer));
1488 if (count > sizeof(buffer) - 1)
1489 count = sizeof(buffer) - 1;
1490 if (copy_from_user(buffer, buf, count))
1493 p = get_proc_task(inode);
1497 if (same_thread_group(current, p))
1498 set_task_comm(p, buffer);
1507 static int comm_show(struct seq_file *m, void *v)
1509 struct inode *inode = m->private;
1510 struct task_struct *p;
1512 p = get_proc_task(inode);
1517 seq_printf(m, "%s\n", p->comm);
1525 static int comm_open(struct inode *inode, struct file *filp)
1529 ret = single_open(filp, comm_show, NULL);
1531 struct seq_file *m = filp->private_data;
1538 static const struct file_operations proc_pid_set_comm_operations = {
1541 .write = comm_write,
1542 .llseek = seq_lseek,
1543 .release = single_release,
1547 * We added or removed a vma mapping the executable. The vmas are only mapped
1548 * during exec and are not mapped with the mmap system call.
1549 * Callers must hold down_write() on the mm's mmap_sem for these
1551 void added_exe_file_vma(struct mm_struct *mm)
1553 mm->num_exe_file_vmas++;
1556 void removed_exe_file_vma(struct mm_struct *mm)
1558 mm->num_exe_file_vmas--;
1559 if ((mm->num_exe_file_vmas == 0) && mm->exe_file){
1561 mm->exe_file = NULL;
1566 void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
1569 get_file(new_exe_file);
1572 mm->exe_file = new_exe_file;
1573 mm->num_exe_file_vmas = 0;
1576 struct file *get_mm_exe_file(struct mm_struct *mm)
1578 struct file *exe_file;
1580 /* We need mmap_sem to protect against races with removal of
1581 * VM_EXECUTABLE vmas */
1582 down_read(&mm->mmap_sem);
1583 exe_file = mm->exe_file;
1586 up_read(&mm->mmap_sem);
1590 void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm)
1592 /* It's safe to write the exe_file pointer without exe_file_lock because
1593 * this is called during fork when the task is not yet in /proc */
1594 newmm->exe_file = get_mm_exe_file(oldmm);
1597 static int proc_exe_link(struct inode *inode, struct path *exe_path)
1599 struct task_struct *task;
1600 struct mm_struct *mm;
1601 struct file *exe_file;
1603 task = get_proc_task(inode);
1606 mm = get_task_mm(task);
1607 put_task_struct(task);
1610 exe_file = get_mm_exe_file(mm);
1613 *exe_path = exe_file->f_path;
1614 path_get(&exe_file->f_path);
1621 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1623 struct inode *inode = dentry->d_inode;
1624 int error = -EACCES;
1626 /* We don't need a base pointer in the /proc filesystem */
1627 path_put(&nd->path);
1629 /* Are we allowed to snoop on the tasks file descriptors? */
1630 if (!proc_fd_access_allowed(inode))
1633 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1635 return ERR_PTR(error);
1638 static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1640 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
1647 pathname = d_path(path, tmp, PAGE_SIZE);
1648 len = PTR_ERR(pathname);
1649 if (IS_ERR(pathname))
1651 len = tmp + PAGE_SIZE - 1 - pathname;
1655 if (copy_to_user(buffer, pathname, len))
1658 free_page((unsigned long)tmp);
1662 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1664 int error = -EACCES;
1665 struct inode *inode = dentry->d_inode;
1668 /* Are we allowed to snoop on the tasks file descriptors? */
1669 if (!proc_fd_access_allowed(inode))
1672 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1676 error = do_proc_readlink(&path, buffer, buflen);
1682 static const struct inode_operations proc_pid_link_inode_operations = {
1683 .readlink = proc_pid_readlink,
1684 .follow_link = proc_pid_follow_link,
1685 .setattr = proc_setattr,
1689 /* building an inode */
1691 static int task_dumpable(struct task_struct *task)
1694 struct mm_struct *mm;
1699 dumpable = get_dumpable(mm);
1707 static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
1709 struct inode * inode;
1710 struct proc_inode *ei;
1711 const struct cred *cred;
1713 /* We need a new inode */
1715 inode = new_inode(sb);
1721 inode->i_ino = get_next_ino();
1722 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1723 inode->i_op = &proc_def_inode_operations;
1726 * grab the reference to task.
1728 ei->pid = get_task_pid(task, PIDTYPE_PID);
1732 if (task_dumpable(task)) {
1734 cred = __task_cred(task);
1735 inode->i_uid = cred->euid;
1736 inode->i_gid = cred->egid;
1739 security_task_to_inode(task, inode);
1749 static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1751 struct inode *inode = dentry->d_inode;
1752 struct task_struct *task;
1753 const struct cred *cred;
1755 generic_fillattr(inode, stat);
1760 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1762 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1763 task_dumpable(task)) {
1764 cred = __task_cred(task);
1765 stat->uid = cred->euid;
1766 stat->gid = cred->egid;
1776 * Exceptional case: normally we are not allowed to unhash a busy
1777 * directory. In this case, however, we can do it - no aliasing problems
1778 * due to the way we treat inodes.
1780 * Rewrite the inode's ownerships here because the owning task may have
1781 * performed a setuid(), etc.
1783 * Before the /proc/pid/status file was created the only way to read
1784 * the effective uid of a /process was to stat /proc/pid. Reading
1785 * /proc/pid/status is slow enough that procps and other packages
1786 * kept stating /proc/pid. To keep the rules in /proc simple I have
1787 * made this apply to all per process world readable and executable
1790 static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1792 struct inode *inode;
1793 struct task_struct *task;
1794 const struct cred *cred;
1796 if (nd && nd->flags & LOOKUP_RCU)
1799 inode = dentry->d_inode;
1800 task = get_proc_task(inode);
1803 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1804 task_dumpable(task)) {
1806 cred = __task_cred(task);
1807 inode->i_uid = cred->euid;
1808 inode->i_gid = cred->egid;
1814 inode->i_mode &= ~(S_ISUID | S_ISGID);
1815 security_task_to_inode(task, inode);
1816 put_task_struct(task);
1823 static int pid_delete_dentry(const struct dentry * dentry)
1825 /* Is the task we represent dead?
1826 * If so, then don't put the dentry on the lru list,
1827 * kill it immediately.
1829 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1832 static const struct dentry_operations pid_dentry_operations =
1834 .d_revalidate = pid_revalidate,
1835 .d_delete = pid_delete_dentry,
1840 typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
1841 struct task_struct *, const void *);
1844 * Fill a directory entry.
1846 * If possible create the dcache entry and derive our inode number and
1847 * file type from dcache entry.
1849 * Since all of the proc inode numbers are dynamically generated, the inode
1850 * numbers do not exist until the inode is cache. This means creating the
1851 * the dcache entry in readdir is necessary to keep the inode numbers
1852 * reported by readdir in sync with the inode numbers reported
1855 static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1856 char *name, int len,
1857 instantiate_t instantiate, struct task_struct *task, const void *ptr)
1859 struct dentry *child, *dir = filp->f_path.dentry;
1860 struct inode *inode;
1863 unsigned type = DT_UNKNOWN;
1867 qname.hash = full_name_hash(name, len);
1869 child = d_lookup(dir, &qname);
1872 new = d_alloc(dir, &qname);
1874 child = instantiate(dir->d_inode, new, task, ptr);
1881 if (!child || IS_ERR(child) || !child->d_inode)
1882 goto end_instantiate;
1883 inode = child->d_inode;
1886 type = inode->i_mode >> 12;
1891 ino = find_inode_number(dir, &qname);
1894 return filldir(dirent, name, len, filp->f_pos, ino, type);
1897 static unsigned name_to_int(struct dentry *dentry)
1899 const char *name = dentry->d_name.name;
1900 int len = dentry->d_name.len;
1903 if (len > 1 && *name == '0')
1906 unsigned c = *name++ - '0';
1909 if (n >= (~0U-9)/10)
1919 #define PROC_FDINFO_MAX 64
1921 static int proc_fd_info(struct inode *inode, struct path *path, char *info)
1923 struct task_struct *task = get_proc_task(inode);
1924 struct files_struct *files = NULL;
1926 int fd = proc_fd(inode);
1929 files = get_files_struct(task);
1930 put_task_struct(task);
1934 * We are not taking a ref to the file structure, so we must
1937 spin_lock(&files->file_lock);
1938 file = fcheck_files(files, fd);
1941 *path = file->f_path;
1942 path_get(&file->f_path);
1945 snprintf(info, PROC_FDINFO_MAX,
1948 (long long) file->f_pos,
1950 spin_unlock(&files->file_lock);
1951 put_files_struct(files);
1954 spin_unlock(&files->file_lock);
1955 put_files_struct(files);
1960 static int proc_fd_link(struct inode *inode, struct path *path)
1962 return proc_fd_info(inode, path, NULL);
1965 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1967 struct inode *inode;
1968 struct task_struct *task;
1970 struct files_struct *files;
1971 const struct cred *cred;
1973 if (nd && nd->flags & LOOKUP_RCU)
1976 inode = dentry->d_inode;
1977 task = get_proc_task(inode);
1978 fd = proc_fd(inode);
1981 files = get_files_struct(task);
1984 if (fcheck_files(files, fd)) {
1986 put_files_struct(files);
1987 if (task_dumpable(task)) {
1989 cred = __task_cred(task);
1990 inode->i_uid = cred->euid;
1991 inode->i_gid = cred->egid;
1997 inode->i_mode &= ~(S_ISUID | S_ISGID);
1998 security_task_to_inode(task, inode);
1999 put_task_struct(task);
2003 put_files_struct(files);
2005 put_task_struct(task);
2011 static const struct dentry_operations tid_fd_dentry_operations =
2013 .d_revalidate = tid_fd_revalidate,
2014 .d_delete = pid_delete_dentry,
2017 static struct dentry *proc_fd_instantiate(struct inode *dir,
2018 struct dentry *dentry, struct task_struct *task, const void *ptr)
2020 unsigned fd = *(const unsigned *)ptr;
2022 struct files_struct *files;
2023 struct inode *inode;
2024 struct proc_inode *ei;
2025 struct dentry *error = ERR_PTR(-ENOENT);
2027 inode = proc_pid_make_inode(dir->i_sb, task);
2032 files = get_files_struct(task);
2035 inode->i_mode = S_IFLNK;
2038 * We are not taking a ref to the file structure, so we must
2041 spin_lock(&files->file_lock);
2042 file = fcheck_files(files, fd);
2045 if (file->f_mode & FMODE_READ)
2046 inode->i_mode |= S_IRUSR | S_IXUSR;
2047 if (file->f_mode & FMODE_WRITE)
2048 inode->i_mode |= S_IWUSR | S_IXUSR;
2049 spin_unlock(&files->file_lock);
2050 put_files_struct(files);
2052 inode->i_op = &proc_pid_link_inode_operations;
2054 ei->op.proc_get_link = proc_fd_link;
2055 d_set_d_op(dentry, &tid_fd_dentry_operations);
2056 d_add(dentry, inode);
2057 /* Close the race of the process dying before we return the dentry */
2058 if (tid_fd_revalidate(dentry, NULL))
2064 spin_unlock(&files->file_lock);
2065 put_files_struct(files);
2071 static struct dentry *proc_lookupfd_common(struct inode *dir,
2072 struct dentry *dentry,
2073 instantiate_t instantiate)
2075 struct task_struct *task = get_proc_task(dir);
2076 unsigned fd = name_to_int(dentry);
2077 struct dentry *result = ERR_PTR(-ENOENT);
2084 result = instantiate(dir, dentry, task, &fd);
2086 put_task_struct(task);
2091 static int proc_readfd_common(struct file * filp, void * dirent,
2092 filldir_t filldir, instantiate_t instantiate)
2094 struct dentry *dentry = filp->f_path.dentry;
2095 struct inode *inode = dentry->d_inode;
2096 struct task_struct *p = get_proc_task(inode);
2097 unsigned int fd, ino;
2099 struct files_struct * files;
2109 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
2113 ino = parent_ino(dentry);
2114 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2118 files = get_files_struct(p);
2122 for (fd = filp->f_pos-2;
2123 fd < files_fdtable(files)->max_fds;
2124 fd++, filp->f_pos++) {
2125 char name[PROC_NUMBUF];
2128 if (!fcheck_files(files, fd))
2132 len = snprintf(name, sizeof(name), "%d", fd);
2133 if (proc_fill_cache(filp, dirent, filldir,
2134 name, len, instantiate,
2142 put_files_struct(files);
2150 static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2151 struct nameidata *nd)
2153 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2156 static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2158 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2161 static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2162 size_t len, loff_t *ppos)
2164 char tmp[PROC_FDINFO_MAX];
2165 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
2167 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2171 static const struct file_operations proc_fdinfo_file_operations = {
2172 .open = nonseekable_open,
2173 .read = proc_fdinfo_read,
2174 .llseek = no_llseek,
2177 static const struct file_operations proc_fd_operations = {
2178 .read = generic_read_dir,
2179 .readdir = proc_readfd,
2180 .llseek = default_llseek,
2184 * /proc/pid/fd needs a special permission handler so that a process can still
2185 * access /proc/self/fd after it has executed a setuid().
2187 static int proc_fd_permission(struct inode *inode, int mask, unsigned int flags)
2191 if (flags & IPERM_FLAG_RCU)
2193 rv = generic_permission(inode, mask, flags, NULL);
2196 if (task_pid(current) == proc_pid(inode))
2202 * proc directories can do almost nothing..
2204 static const struct inode_operations proc_fd_inode_operations = {
2205 .lookup = proc_lookupfd,
2206 .permission = proc_fd_permission,
2207 .setattr = proc_setattr,
2210 static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2211 struct dentry *dentry, struct task_struct *task, const void *ptr)
2213 unsigned fd = *(unsigned *)ptr;
2214 struct inode *inode;
2215 struct proc_inode *ei;
2216 struct dentry *error = ERR_PTR(-ENOENT);
2218 inode = proc_pid_make_inode(dir->i_sb, task);
2223 inode->i_mode = S_IFREG | S_IRUSR;
2224 inode->i_fop = &proc_fdinfo_file_operations;
2225 d_set_d_op(dentry, &tid_fd_dentry_operations);
2226 d_add(dentry, inode);
2227 /* Close the race of the process dying before we return the dentry */
2228 if (tid_fd_revalidate(dentry, NULL))
2235 static struct dentry *proc_lookupfdinfo(struct inode *dir,
2236 struct dentry *dentry,
2237 struct nameidata *nd)
2239 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2242 static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2244 return proc_readfd_common(filp, dirent, filldir,
2245 proc_fdinfo_instantiate);
2248 static const struct file_operations proc_fdinfo_operations = {
2249 .read = generic_read_dir,
2250 .readdir = proc_readfdinfo,
2251 .llseek = default_llseek,
2255 * proc directories can do almost nothing..
2257 static const struct inode_operations proc_fdinfo_inode_operations = {
2258 .lookup = proc_lookupfdinfo,
2259 .setattr = proc_setattr,
2263 static struct dentry *proc_pident_instantiate(struct inode *dir,
2264 struct dentry *dentry, struct task_struct *task, const void *ptr)
2266 const struct pid_entry *p = ptr;
2267 struct inode *inode;
2268 struct proc_inode *ei;
2269 struct dentry *error = ERR_PTR(-ENOENT);
2271 inode = proc_pid_make_inode(dir->i_sb, task);
2276 inode->i_mode = p->mode;
2277 if (S_ISDIR(inode->i_mode))
2278 inode->i_nlink = 2; /* Use getattr to fix if necessary */
2280 inode->i_op = p->iop;
2282 inode->i_fop = p->fop;
2284 d_set_d_op(dentry, &pid_dentry_operations);
2285 d_add(dentry, inode);
2286 /* Close the race of the process dying before we return the dentry */
2287 if (pid_revalidate(dentry, NULL))
2293 static struct dentry *proc_pident_lookup(struct inode *dir,
2294 struct dentry *dentry,
2295 const struct pid_entry *ents,
2298 struct dentry *error;
2299 struct task_struct *task = get_proc_task(dir);
2300 const struct pid_entry *p, *last;
2302 error = ERR_PTR(-ENOENT);
2308 * Yes, it does not scale. And it should not. Don't add
2309 * new entries into /proc/<tgid>/ without very good reasons.
2311 last = &ents[nents - 1];
2312 for (p = ents; p <= last; p++) {
2313 if (p->len != dentry->d_name.len)
2315 if (!memcmp(dentry->d_name.name, p->name, p->len))
2321 error = proc_pident_instantiate(dir, dentry, task, p);
2323 put_task_struct(task);
2328 static int proc_pident_fill_cache(struct file *filp, void *dirent,
2329 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2331 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2332 proc_pident_instantiate, task, p);
2335 static int proc_pident_readdir(struct file *filp,
2336 void *dirent, filldir_t filldir,
2337 const struct pid_entry *ents, unsigned int nents)
2340 struct dentry *dentry = filp->f_path.dentry;
2341 struct inode *inode = dentry->d_inode;
2342 struct task_struct *task = get_proc_task(inode);
2343 const struct pid_entry *p, *last;
2356 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2362 ino = parent_ino(dentry);
2363 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2375 last = &ents[nents - 1];
2377 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
2386 put_task_struct(task);
2391 #ifdef CONFIG_SECURITY
2392 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2393 size_t count, loff_t *ppos)
2395 struct inode * inode = file->f_path.dentry->d_inode;
2398 struct task_struct *task = get_proc_task(inode);
2403 length = security_getprocattr(task,
2404 (char*)file->f_path.dentry->d_name.name,
2406 put_task_struct(task);
2408 length = simple_read_from_buffer(buf, count, ppos, p, length);
2413 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2414 size_t count, loff_t *ppos)
2416 struct inode * inode = file->f_path.dentry->d_inode;
2419 struct task_struct *task = get_proc_task(inode);
2424 if (count > PAGE_SIZE)
2427 /* No partial writes. */
2433 page = (char*)__get_free_page(GFP_TEMPORARY);
2438 if (copy_from_user(page, buf, count))
2441 /* Guard against adverse ptrace interaction */
2442 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
2446 length = security_setprocattr(task,
2447 (char*)file->f_path.dentry->d_name.name,
2448 (void*)page, count);
2449 mutex_unlock(&task->signal->cred_guard_mutex);
2451 free_page((unsigned long) page);
2453 put_task_struct(task);
2458 static const struct file_operations proc_pid_attr_operations = {
2459 .read = proc_pid_attr_read,
2460 .write = proc_pid_attr_write,
2461 .llseek = generic_file_llseek,
2464 static const struct pid_entry attr_dir_stuff[] = {
2465 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2466 REG("prev", S_IRUGO, proc_pid_attr_operations),
2467 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2468 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2469 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2470 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2473 static int proc_attr_dir_readdir(struct file * filp,
2474 void * dirent, filldir_t filldir)
2476 return proc_pident_readdir(filp,dirent,filldir,
2477 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
2480 static const struct file_operations proc_attr_dir_operations = {
2481 .read = generic_read_dir,
2482 .readdir = proc_attr_dir_readdir,
2483 .llseek = default_llseek,
2486 static struct dentry *proc_attr_dir_lookup(struct inode *dir,
2487 struct dentry *dentry, struct nameidata *nd)
2489 return proc_pident_lookup(dir, dentry,
2490 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
2493 static const struct inode_operations proc_attr_dir_inode_operations = {
2494 .lookup = proc_attr_dir_lookup,
2495 .getattr = pid_getattr,
2496 .setattr = proc_setattr,
2501 #ifdef CONFIG_ELF_CORE
2502 static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2503 size_t count, loff_t *ppos)
2505 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2506 struct mm_struct *mm;
2507 char buffer[PROC_NUMBUF];
2515 mm = get_task_mm(task);
2517 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2518 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2519 MMF_DUMP_FILTER_SHIFT));
2521 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2524 put_task_struct(task);
2529 static ssize_t proc_coredump_filter_write(struct file *file,
2530 const char __user *buf,
2534 struct task_struct *task;
2535 struct mm_struct *mm;
2536 char buffer[PROC_NUMBUF], *end;
2543 memset(buffer, 0, sizeof(buffer));
2544 if (count > sizeof(buffer) - 1)
2545 count = sizeof(buffer) - 1;
2546 if (copy_from_user(buffer, buf, count))
2550 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2553 if (end - buffer == 0)
2557 task = get_proc_task(file->f_dentry->d_inode);
2562 mm = get_task_mm(task);
2566 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2568 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2570 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2575 put_task_struct(task);
2580 static const struct file_operations proc_coredump_filter_operations = {
2581 .read = proc_coredump_filter_read,
2582 .write = proc_coredump_filter_write,
2583 .llseek = generic_file_llseek,
2590 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2593 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2594 pid_t tgid = task_tgid_nr_ns(current, ns);
2595 char tmp[PROC_NUMBUF];
2598 sprintf(tmp, "%d", tgid);
2599 return vfs_readlink(dentry,buffer,buflen,tmp);
2602 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2604 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2605 pid_t tgid = task_tgid_nr_ns(current, ns);
2606 char *name = ERR_PTR(-ENOENT);
2610 name = ERR_PTR(-ENOMEM);
2612 sprintf(name, "%d", tgid);
2614 nd_set_link(nd, name);
2618 static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2621 char *s = nd_get_link(nd);
2626 static const struct inode_operations proc_self_inode_operations = {
2627 .readlink = proc_self_readlink,
2628 .follow_link = proc_self_follow_link,
2629 .put_link = proc_self_put_link,
2635 * These are the directory entries in the root directory of /proc
2636 * that properly belong to the /proc filesystem, as they describe
2637 * describe something that is process related.
2639 static const struct pid_entry proc_base_stuff[] = {
2640 NOD("self", S_IFLNK|S_IRWXUGO,
2641 &proc_self_inode_operations, NULL, {}),
2645 * Exceptional case: normally we are not allowed to unhash a busy
2646 * directory. In this case, however, we can do it - no aliasing problems
2647 * due to the way we treat inodes.
2649 static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd)
2651 struct inode *inode;
2652 struct task_struct *task;
2654 if (nd->flags & LOOKUP_RCU)
2657 inode = dentry->d_inode;
2658 task = get_proc_task(inode);
2660 put_task_struct(task);
2667 static const struct dentry_operations proc_base_dentry_operations =
2669 .d_revalidate = proc_base_revalidate,
2670 .d_delete = pid_delete_dentry,
2673 static struct dentry *proc_base_instantiate(struct inode *dir,
2674 struct dentry *dentry, struct task_struct *task, const void *ptr)
2676 const struct pid_entry *p = ptr;
2677 struct inode *inode;
2678 struct proc_inode *ei;
2679 struct dentry *error;
2681 /* Allocate the inode */
2682 error = ERR_PTR(-ENOMEM);
2683 inode = new_inode(dir->i_sb);
2687 /* Initialize the inode */
2689 inode->i_ino = get_next_ino();
2690 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
2693 * grab the reference to the task.
2695 ei->pid = get_task_pid(task, PIDTYPE_PID);
2699 inode->i_mode = p->mode;
2700 if (S_ISDIR(inode->i_mode))
2702 if (S_ISLNK(inode->i_mode))
2705 inode->i_op = p->iop;
2707 inode->i_fop = p->fop;
2709 d_set_d_op(dentry, &proc_base_dentry_operations);
2710 d_add(dentry, inode);
2719 static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2721 struct dentry *error;
2722 struct task_struct *task = get_proc_task(dir);
2723 const struct pid_entry *p, *last;
2725 error = ERR_PTR(-ENOENT);
2730 /* Lookup the directory entry */
2731 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2732 for (p = proc_base_stuff; p <= last; p++) {
2733 if (p->len != dentry->d_name.len)
2735 if (!memcmp(dentry->d_name.name, p->name, p->len))
2741 error = proc_base_instantiate(dir, dentry, task, p);
2744 put_task_struct(task);
2749 static int proc_base_fill_cache(struct file *filp, void *dirent,
2750 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2752 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2753 proc_base_instantiate, task, p);
2756 #ifdef CONFIG_TASK_IO_ACCOUNTING
2757 static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2759 struct task_io_accounting acct = task->ioac;
2760 unsigned long flags;
2762 if (whole && lock_task_sighand(task, &flags)) {
2763 struct task_struct *t = task;
2765 task_io_accounting_add(&acct, &task->signal->ioac);
2766 while_each_thread(task, t)
2767 task_io_accounting_add(&acct, &t->ioac);
2769 unlock_task_sighand(task, &flags);
2771 return sprintf(buffer,
2776 "read_bytes: %llu\n"
2777 "write_bytes: %llu\n"
2778 "cancelled_write_bytes: %llu\n",
2779 (unsigned long long)acct.rchar,
2780 (unsigned long long)acct.wchar,
2781 (unsigned long long)acct.syscr,
2782 (unsigned long long)acct.syscw,
2783 (unsigned long long)acct.read_bytes,
2784 (unsigned long long)acct.write_bytes,
2785 (unsigned long long)acct.cancelled_write_bytes);
2788 static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2790 return do_io_accounting(task, buffer, 0);
2793 static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2795 return do_io_accounting(task, buffer, 1);
2797 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2799 static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2800 struct pid *pid, struct task_struct *task)
2802 seq_printf(m, "%08x\n", task->personality);
2809 static const struct file_operations proc_task_operations;
2810 static const struct inode_operations proc_task_inode_operations;
2812 static const struct pid_entry tgid_base_stuff[] = {
2813 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2814 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2815 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
2817 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
2819 REG("environ", S_IRUSR, proc_environ_operations),
2820 INF("auxv", S_IRUSR, proc_pid_auxv),
2821 ONE("status", S_IRUGO, proc_pid_status),
2822 ONE("personality", S_IRUSR, proc_pid_personality),
2823 INF("limits", S_IRUGO, proc_pid_limits),
2824 #ifdef CONFIG_SCHED_DEBUG
2825 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
2827 #ifdef CONFIG_SCHED_AUTOGROUP
2828 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
2830 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
2831 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2832 INF("syscall", S_IRUSR, proc_pid_syscall),
2834 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2835 ONE("stat", S_IRUGO, proc_tgid_stat),
2836 ONE("statm", S_IRUGO, proc_pid_statm),
2837 REG("maps", S_IRUGO, proc_maps_operations),
2839 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
2841 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2842 LNK("cwd", proc_cwd_link),
2843 LNK("root", proc_root_link),
2844 LNK("exe", proc_exe_link),
2845 REG("mounts", S_IRUGO, proc_mounts_operations),
2846 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2847 REG("mountstats", S_IRUSR, proc_mountstats_operations),
2848 #ifdef CONFIG_PROC_PAGE_MONITOR
2849 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2850 REG("smaps", S_IRUGO, proc_smaps_operations),
2851 REG("pagemap", S_IRUSR, proc_pagemap_operations),
2853 #ifdef CONFIG_SECURITY
2854 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
2856 #ifdef CONFIG_KALLSYMS
2857 INF("wchan", S_IRUGO, proc_pid_wchan),
2859 #ifdef CONFIG_STACKTRACE
2860 ONE("stack", S_IRUSR, proc_pid_stack),
2862 #ifdef CONFIG_SCHEDSTATS
2863 INF("schedstat", S_IRUGO, proc_pid_schedstat),
2865 #ifdef CONFIG_LATENCYTOP
2866 REG("latency", S_IRUGO, proc_lstats_operations),
2868 #ifdef CONFIG_PROC_PID_CPUSET
2869 REG("cpuset", S_IRUGO, proc_cpuset_operations),
2871 #ifdef CONFIG_CGROUPS
2872 REG("cgroup", S_IRUGO, proc_cgroup_operations),
2874 INF("oom_score", S_IRUGO, proc_oom_score),
2875 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
2876 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
2877 #ifdef CONFIG_AUDITSYSCALL
2878 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2879 REG("sessionid", S_IRUGO, proc_sessionid_operations),
2881 #ifdef CONFIG_FAULT_INJECTION
2882 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
2884 #ifdef CONFIG_ELF_CORE
2885 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
2887 #ifdef CONFIG_TASK_IO_ACCOUNTING
2888 INF("io", S_IRUGO, proc_tgid_io_accounting),
2892 static int proc_tgid_base_readdir(struct file * filp,
2893 void * dirent, filldir_t filldir)
2895 return proc_pident_readdir(filp,dirent,filldir,
2896 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
2899 static const struct file_operations proc_tgid_base_operations = {
2900 .read = generic_read_dir,
2901 .readdir = proc_tgid_base_readdir,
2902 .llseek = default_llseek,
2905 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
2906 return proc_pident_lookup(dir, dentry,
2907 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
2910 static const struct inode_operations proc_tgid_base_inode_operations = {
2911 .lookup = proc_tgid_base_lookup,
2912 .getattr = pid_getattr,
2913 .setattr = proc_setattr,
2916 static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
2918 struct dentry *dentry, *leader, *dir;
2919 char buf[PROC_NUMBUF];
2923 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2924 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
2926 shrink_dcache_parent(dentry);
2932 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2933 leader = d_hash_and_lookup(mnt->mnt_root, &name);
2938 name.len = strlen(name.name);
2939 dir = d_hash_and_lookup(leader, &name);
2941 goto out_put_leader;
2944 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2945 dentry = d_hash_and_lookup(dir, &name);
2947 shrink_dcache_parent(dentry);
2960 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2961 * @task: task that should be flushed.
2963 * When flushing dentries from proc, one needs to flush them from global
2964 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2965 * in. This call is supposed to do all of this job.
2967 * Looks in the dcache for
2969 * /proc/@tgid/task/@pid
2970 * if either directory is present flushes it and all of it'ts children
2973 * It is safe and reasonable to cache /proc entries for a task until
2974 * that task exits. After that they just clog up the dcache with
2975 * useless entries, possibly causing useful dcache entries to be
2976 * flushed instead. This routine is proved to flush those useless
2977 * dcache entries at process exit time.
2979 * NOTE: This routine is just an optimization so it does not guarantee
2980 * that no dcache entries will exist at process exit time it
2981 * just makes it very unlikely that any will persist.
2984 void proc_flush_task(struct task_struct *task)
2987 struct pid *pid, *tgid;
2990 pid = task_pid(task);
2991 tgid = task_tgid(task);
2993 for (i = 0; i <= pid->level; i++) {
2994 upid = &pid->numbers[i];
2995 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
2996 tgid->numbers[i].nr);
2999 upid = &pid->numbers[pid->level];
3001 pid_ns_release_proc(upid->ns);
3004 static struct dentry *proc_pid_instantiate(struct inode *dir,
3005 struct dentry * dentry,
3006 struct task_struct *task, const void *ptr)
3008 struct dentry *error = ERR_PTR(-ENOENT);
3009 struct inode *inode;
3011 inode = proc_pid_make_inode(dir->i_sb, task);
3015 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3016 inode->i_op = &proc_tgid_base_inode_operations;
3017 inode->i_fop = &proc_tgid_base_operations;
3018 inode->i_flags|=S_IMMUTABLE;
3020 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
3021 ARRAY_SIZE(tgid_base_stuff));
3023 d_set_d_op(dentry, &pid_dentry_operations);
3025 d_add(dentry, inode);
3026 /* Close the race of the process dying before we return the dentry */
3027 if (pid_revalidate(dentry, NULL))
3033 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3035 struct dentry *result;
3036 struct task_struct *task;
3038 struct pid_namespace *ns;
3040 result = proc_base_lookup(dir, dentry);
3041 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3044 tgid = name_to_int(dentry);
3048 ns = dentry->d_sb->s_fs_info;
3050 task = find_task_by_pid_ns(tgid, ns);
3052 get_task_struct(task);
3057 result = proc_pid_instantiate(dir, dentry, task, NULL);
3058 put_task_struct(task);
3064 * Find the first task with tgid >= tgid
3069 struct task_struct *task;
3071 static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3076 put_task_struct(iter.task);
3080 pid = find_ge_pid(iter.tgid, ns);
3082 iter.tgid = pid_nr_ns(pid, ns);
3083 iter.task = pid_task(pid, PIDTYPE_PID);
3084 /* What we to know is if the pid we have find is the
3085 * pid of a thread_group_leader. Testing for task
3086 * being a thread_group_leader is the obvious thing
3087 * todo but there is a window when it fails, due to
3088 * the pid transfer logic in de_thread.
3090 * So we perform the straight forward test of seeing
3091 * if the pid we have found is the pid of a thread
3092 * group leader, and don't worry if the task we have
3093 * found doesn't happen to be a thread group leader.
3094 * As we don't care in the case of readdir.
3096 if (!iter.task || !has_group_leader_pid(iter.task)) {
3100 get_task_struct(iter.task);
3106 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
3108 static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3109 struct tgid_iter iter)
3111 char name[PROC_NUMBUF];
3112 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
3113 return proc_fill_cache(filp, dirent, filldir, name, len,
3114 proc_pid_instantiate, iter.task, NULL);
3117 /* for the /proc/ directory itself, after non-process stuff has been done */
3118 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3120 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3121 struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
3122 struct tgid_iter iter;
3123 struct pid_namespace *ns;
3128 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
3129 const struct pid_entry *p = &proc_base_stuff[nr];
3130 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
3134 ns = filp->f_dentry->d_sb->s_fs_info;
3136 iter.tgid = filp->f_pos - TGID_OFFSET;
3137 for (iter = next_tgid(ns, iter);
3139 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3140 filp->f_pos = iter.tgid + TGID_OFFSET;
3141 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3142 put_task_struct(iter.task);
3146 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3148 put_task_struct(reaper);
3156 static const struct pid_entry tid_base_stuff[] = {
3157 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3158 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
3159 REG("environ", S_IRUSR, proc_environ_operations),
3160 INF("auxv", S_IRUSR, proc_pid_auxv),
3161 ONE("status", S_IRUGO, proc_pid_status),
3162 ONE("personality", S_IRUSR, proc_pid_personality),
3163 INF("limits", S_IRUGO, proc_pid_limits),
3164 #ifdef CONFIG_SCHED_DEBUG
3165 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
3167 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
3168 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3169 INF("syscall", S_IRUSR, proc_pid_syscall),
3171 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3172 ONE("stat", S_IRUGO, proc_tid_stat),
3173 ONE("statm", S_IRUGO, proc_pid_statm),
3174 REG("maps", S_IRUGO, proc_maps_operations),
3176 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
3178 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3179 LNK("cwd", proc_cwd_link),
3180 LNK("root", proc_root_link),
3181 LNK("exe", proc_exe_link),
3182 REG("mounts", S_IRUGO, proc_mounts_operations),
3183 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3184 #ifdef CONFIG_PROC_PAGE_MONITOR
3185 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3186 REG("smaps", S_IRUGO, proc_smaps_operations),
3187 REG("pagemap", S_IRUSR, proc_pagemap_operations),
3189 #ifdef CONFIG_SECURITY
3190 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
3192 #ifdef CONFIG_KALLSYMS
3193 INF("wchan", S_IRUGO, proc_pid_wchan),
3195 #ifdef CONFIG_STACKTRACE
3196 ONE("stack", S_IRUSR, proc_pid_stack),
3198 #ifdef CONFIG_SCHEDSTATS
3199 INF("schedstat", S_IRUGO, proc_pid_schedstat),
3201 #ifdef CONFIG_LATENCYTOP
3202 REG("latency", S_IRUGO, proc_lstats_operations),
3204 #ifdef CONFIG_PROC_PID_CPUSET
3205 REG("cpuset", S_IRUGO, proc_cpuset_operations),
3207 #ifdef CONFIG_CGROUPS
3208 REG("cgroup", S_IRUGO, proc_cgroup_operations),
3210 INF("oom_score", S_IRUGO, proc_oom_score),
3211 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
3212 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
3213 #ifdef CONFIG_AUDITSYSCALL
3214 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3215 REG("sessionid", S_IRUSR, proc_sessionid_operations),
3217 #ifdef CONFIG_FAULT_INJECTION
3218 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
3220 #ifdef CONFIG_TASK_IO_ACCOUNTING
3221 INF("io", S_IRUGO, proc_tid_io_accounting),
3225 static int proc_tid_base_readdir(struct file * filp,
3226 void * dirent, filldir_t filldir)
3228 return proc_pident_readdir(filp,dirent,filldir,
3229 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3232 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
3233 return proc_pident_lookup(dir, dentry,
3234 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
3237 static const struct file_operations proc_tid_base_operations = {
3238 .read = generic_read_dir,
3239 .readdir = proc_tid_base_readdir,
3240 .llseek = default_llseek,
3243 static const struct inode_operations proc_tid_base_inode_operations = {
3244 .lookup = proc_tid_base_lookup,
3245 .getattr = pid_getattr,
3246 .setattr = proc_setattr,
3249 static struct dentry *proc_task_instantiate(struct inode *dir,
3250 struct dentry *dentry, struct task_struct *task, const void *ptr)
3252 struct dentry *error = ERR_PTR(-ENOENT);
3253 struct inode *inode;
3254 inode = proc_pid_make_inode(dir->i_sb, task);
3258 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3259 inode->i_op = &proc_tid_base_inode_operations;
3260 inode->i_fop = &proc_tid_base_operations;
3261 inode->i_flags|=S_IMMUTABLE;
3263 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
3264 ARRAY_SIZE(tid_base_stuff));
3266 d_set_d_op(dentry, &pid_dentry_operations);
3268 d_add(dentry, inode);
3269 /* Close the race of the process dying before we return the dentry */
3270 if (pid_revalidate(dentry, NULL))
3276 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3278 struct dentry *result = ERR_PTR(-ENOENT);
3279 struct task_struct *task;
3280 struct task_struct *leader = get_proc_task(dir);
3282 struct pid_namespace *ns;
3287 tid = name_to_int(dentry);
3291 ns = dentry->d_sb->s_fs_info;
3293 task = find_task_by_pid_ns(tid, ns);
3295 get_task_struct(task);
3299 if (!same_thread_group(leader, task))
3302 result = proc_task_instantiate(dir, dentry, task, NULL);
3304 put_task_struct(task);
3306 put_task_struct(leader);
3312 * Find the first tid of a thread group to return to user space.
3314 * Usually this is just the thread group leader, but if the users
3315 * buffer was too small or there was a seek into the middle of the
3316 * directory we have more work todo.
3318 * In the case of a short read we start with find_task_by_pid.
3320 * In the case of a seek we start with the leader and walk nr
3323 static struct task_struct *first_tid(struct task_struct *leader,
3324 int tid, int nr, struct pid_namespace *ns)
3326 struct task_struct *pos;
3329 /* Attempt to start with the pid of a thread */
3330 if (tid && (nr > 0)) {
3331 pos = find_task_by_pid_ns(tid, ns);
3332 if (pos && (pos->group_leader == leader))
3336 /* If nr exceeds the number of threads there is nothing todo */
3338 if (nr && nr >= get_nr_threads(leader))
3341 /* If we haven't found our starting place yet start
3342 * with the leader and walk nr threads forward.
3344 for (pos = leader; nr > 0; --nr) {
3345 pos = next_thread(pos);
3346 if (pos == leader) {
3352 get_task_struct(pos);
3359 * Find the next thread in the thread list.
3360 * Return NULL if there is an error or no next thread.
3362 * The reference to the input task_struct is released.
3364 static struct task_struct *next_tid(struct task_struct *start)
3366 struct task_struct *pos = NULL;
3368 if (pid_alive(start)) {
3369 pos = next_thread(start);
3370 if (thread_group_leader(pos))
3373 get_task_struct(pos);
3376 put_task_struct(start);
3380 static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3381 struct task_struct *task, int tid)
3383 char name[PROC_NUMBUF];
3384 int len = snprintf(name, sizeof(name), "%d", tid);
3385 return proc_fill_cache(filp, dirent, filldir, name, len,
3386 proc_task_instantiate, task, NULL);
3389 /* for the /proc/TGID/task/ directories */
3390 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3392 struct dentry *dentry = filp->f_path.dentry;
3393 struct inode *inode = dentry->d_inode;
3394 struct task_struct *leader = NULL;
3395 struct task_struct *task;
3396 int retval = -ENOENT;
3399 struct pid_namespace *ns;
3401 task = get_proc_task(inode);
3405 if (pid_alive(task)) {
3406 leader = task->group_leader;
3407 get_task_struct(leader);
3410 put_task_struct(task);
3415 switch ((unsigned long)filp->f_pos) {
3418 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
3423 ino = parent_ino(dentry);
3424 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
3430 /* f_version caches the tgid value that the last readdir call couldn't
3431 * return. lseek aka telldir automagically resets f_version to 0.
3433 ns = filp->f_dentry->d_sb->s_fs_info;
3434 tid = (int)filp->f_version;
3435 filp->f_version = 0;
3436 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
3438 task = next_tid(task), filp->f_pos++) {
3439 tid = task_pid_nr_ns(task, ns);
3440 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
3441 /* returning this tgid failed, save it as the first
3442 * pid for the next readir call */
3443 filp->f_version = (u64)tid;
3444 put_task_struct(task);
3449 put_task_struct(leader);
3454 static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3456 struct inode *inode = dentry->d_inode;
3457 struct task_struct *p = get_proc_task(inode);
3458 generic_fillattr(inode, stat);
3461 stat->nlink += get_nr_threads(p);
3468 static const struct inode_operations proc_task_inode_operations = {
3469 .lookup = proc_task_lookup,
3470 .getattr = proc_task_getattr,
3471 .setattr = proc_setattr,
3474 static const struct file_operations proc_task_operations = {
3475 .read = generic_read_dir,
3476 .readdir = proc_task_readdir,
3477 .llseek = default_llseek,