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);
194 static struct mm_struct *__check_mem_permission(struct task_struct *task)
196 struct mm_struct *mm;
198 mm = get_task_mm(task);
200 return ERR_PTR(-EINVAL);
203 * A task can always look at itself, in case it chooses
204 * to use system calls instead of load instructions.
210 * If current is actively ptrace'ing, and would also be
211 * permitted to freshly attach with ptrace now, permit it.
213 if (task_is_stopped_or_traced(task)) {
216 match = (tracehook_tracer_task(task) == current);
218 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
223 * No one else is allowed.
226 return ERR_PTR(-EPERM);
230 * If current may access user memory in @task return a reference to the
231 * corresponding mm, otherwise ERR_PTR.
233 static struct mm_struct *check_mem_permission(struct task_struct *task)
235 struct mm_struct *mm;
239 * Avoid racing if task exec's as we might get a new mm but validate
240 * against old credentials.
242 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
246 mm = __check_mem_permission(task);
247 mutex_unlock(&task->signal->cred_guard_mutex);
252 struct mm_struct *mm_for_maps(struct task_struct *task)
254 struct mm_struct *mm;
257 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
261 mm = get_task_mm(task);
262 if (mm && mm != current->mm &&
263 !ptrace_may_access(task, PTRACE_MODE_READ)) {
265 mm = ERR_PTR(-EACCES);
267 mutex_unlock(&task->signal->cred_guard_mutex);
272 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
276 struct mm_struct *mm = get_task_mm(task);
280 goto out_mm; /* Shh! No looking before we're done */
282 len = mm->arg_end - mm->arg_start;
287 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
289 // If the nul at the end of args has been overwritten, then
290 // assume application is using setproctitle(3).
291 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
292 len = strnlen(buffer, res);
296 len = mm->env_end - mm->env_start;
297 if (len > PAGE_SIZE - res)
298 len = PAGE_SIZE - res;
299 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
300 res = strnlen(buffer, res);
309 static int proc_pid_auxv(struct task_struct *task, char *buffer)
311 struct mm_struct *mm = mm_for_maps(task);
312 int res = PTR_ERR(mm);
313 if (mm && !IS_ERR(mm)) {
314 unsigned int nwords = 0;
317 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
318 res = nwords * sizeof(mm->saved_auxv[0]);
321 memcpy(buffer, mm->saved_auxv, res);
328 #ifdef CONFIG_KALLSYMS
330 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
331 * Returns the resolved symbol. If that fails, simply return the address.
333 static int proc_pid_wchan(struct task_struct *task, char *buffer)
336 char symname[KSYM_NAME_LEN];
338 wchan = get_wchan(task);
340 if (lookup_symbol_name(wchan, symname) < 0)
341 if (!ptrace_may_access(task, PTRACE_MODE_READ))
344 return sprintf(buffer, "%lu", wchan);
346 return sprintf(buffer, "%s", symname);
348 #endif /* CONFIG_KALLSYMS */
350 static int lock_trace(struct task_struct *task)
352 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
355 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
356 mutex_unlock(&task->signal->cred_guard_mutex);
362 static void unlock_trace(struct task_struct *task)
364 mutex_unlock(&task->signal->cred_guard_mutex);
367 #ifdef CONFIG_STACKTRACE
369 #define MAX_STACK_TRACE_DEPTH 64
371 static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
372 struct pid *pid, struct task_struct *task)
374 struct stack_trace trace;
375 unsigned long *entries;
379 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
383 trace.nr_entries = 0;
384 trace.max_entries = MAX_STACK_TRACE_DEPTH;
385 trace.entries = entries;
388 err = lock_trace(task);
390 save_stack_trace_tsk(task, &trace);
392 for (i = 0; i < trace.nr_entries; i++) {
393 seq_printf(m, "[<%pK>] %pS\n",
394 (void *)entries[i], (void *)entries[i]);
404 #ifdef CONFIG_SCHEDSTATS
406 * Provides /proc/PID/schedstat
408 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
410 return sprintf(buffer, "%llu %llu %lu\n",
411 (unsigned long long)task->se.sum_exec_runtime,
412 (unsigned long long)task->sched_info.run_delay,
413 task->sched_info.pcount);
417 #ifdef CONFIG_LATENCYTOP
418 static int lstats_show_proc(struct seq_file *m, void *v)
421 struct inode *inode = m->private;
422 struct task_struct *task = get_proc_task(inode);
426 seq_puts(m, "Latency Top version : v0.1\n");
427 for (i = 0; i < 32; i++) {
428 struct latency_record *lr = &task->latency_record[i];
429 if (lr->backtrace[0]) {
431 seq_printf(m, "%i %li %li",
432 lr->count, lr->time, lr->max);
433 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
434 unsigned long bt = lr->backtrace[q];
439 seq_printf(m, " %ps", (void *)bt);
445 put_task_struct(task);
449 static int lstats_open(struct inode *inode, struct file *file)
451 return single_open(file, lstats_show_proc, inode);
454 static ssize_t lstats_write(struct file *file, const char __user *buf,
455 size_t count, loff_t *offs)
457 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
461 clear_all_latency_tracing(task);
462 put_task_struct(task);
467 static const struct file_operations proc_lstats_operations = {
470 .write = lstats_write,
472 .release = single_release,
477 static int proc_oom_score(struct task_struct *task, char *buffer)
479 unsigned long points = 0;
481 read_lock(&tasklist_lock);
483 points = oom_badness(task, NULL, NULL,
484 totalram_pages + total_swap_pages);
485 read_unlock(&tasklist_lock);
486 return sprintf(buffer, "%lu\n", points);
494 static const struct limit_names lnames[RLIM_NLIMITS] = {
495 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
496 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
497 [RLIMIT_DATA] = {"Max data size", "bytes"},
498 [RLIMIT_STACK] = {"Max stack size", "bytes"},
499 [RLIMIT_CORE] = {"Max core file size", "bytes"},
500 [RLIMIT_RSS] = {"Max resident set", "bytes"},
501 [RLIMIT_NPROC] = {"Max processes", "processes"},
502 [RLIMIT_NOFILE] = {"Max open files", "files"},
503 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
504 [RLIMIT_AS] = {"Max address space", "bytes"},
505 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
506 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
507 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
508 [RLIMIT_NICE] = {"Max nice priority", NULL},
509 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
510 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
513 /* Display limits for a process */
514 static int proc_pid_limits(struct task_struct *task, char *buffer)
519 char *bufptr = buffer;
521 struct rlimit rlim[RLIM_NLIMITS];
523 if (!lock_task_sighand(task, &flags))
525 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
526 unlock_task_sighand(task, &flags);
529 * print the file header
531 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
532 "Limit", "Soft Limit", "Hard Limit", "Units");
534 for (i = 0; i < RLIM_NLIMITS; i++) {
535 if (rlim[i].rlim_cur == RLIM_INFINITY)
536 count += sprintf(&bufptr[count], "%-25s %-20s ",
537 lnames[i].name, "unlimited");
539 count += sprintf(&bufptr[count], "%-25s %-20lu ",
540 lnames[i].name, rlim[i].rlim_cur);
542 if (rlim[i].rlim_max == RLIM_INFINITY)
543 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
545 count += sprintf(&bufptr[count], "%-20lu ",
549 count += sprintf(&bufptr[count], "%-10s\n",
552 count += sprintf(&bufptr[count], "\n");
558 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
559 static int proc_pid_syscall(struct task_struct *task, char *buffer)
562 unsigned long args[6], sp, pc;
563 int res = lock_trace(task);
567 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
568 res = sprintf(buffer, "running\n");
570 res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
572 res = sprintf(buffer,
573 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
575 args[0], args[1], args[2], args[3], args[4], args[5],
580 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
582 /************************************************************************/
583 /* Here the fs part begins */
584 /************************************************************************/
586 /* permission checks */
587 static int proc_fd_access_allowed(struct inode *inode)
589 struct task_struct *task;
591 /* Allow access to a task's file descriptors if it is us or we
592 * may use ptrace attach to the process and find out that
595 task = get_proc_task(inode);
597 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
598 put_task_struct(task);
603 int proc_setattr(struct dentry *dentry, struct iattr *attr)
606 struct inode *inode = dentry->d_inode;
608 if (attr->ia_valid & ATTR_MODE)
611 error = inode_change_ok(inode, attr);
615 if ((attr->ia_valid & ATTR_SIZE) &&
616 attr->ia_size != i_size_read(inode)) {
617 error = vmtruncate(inode, attr->ia_size);
622 setattr_copy(inode, attr);
623 mark_inode_dirty(inode);
627 static const struct inode_operations proc_def_inode_operations = {
628 .setattr = proc_setattr,
631 static int mounts_open_common(struct inode *inode, struct file *file,
632 const struct seq_operations *op)
634 struct task_struct *task = get_proc_task(inode);
636 struct mnt_namespace *ns = NULL;
638 struct proc_mounts *p;
643 nsp = task_nsproxy(task);
650 if (ns && get_task_root(task, &root) == 0)
652 put_task_struct(task);
661 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
665 file->private_data = &p->m;
666 ret = seq_open(file, op);
673 p->event = ns->event;
687 static int mounts_release(struct inode *inode, struct file *file)
689 struct proc_mounts *p = file->private_data;
692 return seq_release(inode, file);
695 static unsigned mounts_poll(struct file *file, poll_table *wait)
697 struct proc_mounts *p = file->private_data;
698 unsigned res = POLLIN | POLLRDNORM;
700 poll_wait(file, &p->ns->poll, wait);
701 if (mnt_had_events(p))
702 res |= POLLERR | POLLPRI;
707 static int mounts_open(struct inode *inode, struct file *file)
709 return mounts_open_common(inode, file, &mounts_op);
712 static const struct file_operations proc_mounts_operations = {
716 .release = mounts_release,
720 static int mountinfo_open(struct inode *inode, struct file *file)
722 return mounts_open_common(inode, file, &mountinfo_op);
725 static const struct file_operations proc_mountinfo_operations = {
726 .open = mountinfo_open,
729 .release = mounts_release,
733 static int mountstats_open(struct inode *inode, struct file *file)
735 return mounts_open_common(inode, file, &mountstats_op);
738 static const struct file_operations proc_mountstats_operations = {
739 .open = mountstats_open,
742 .release = mounts_release,
745 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
747 static ssize_t proc_info_read(struct file * file, char __user * buf,
748 size_t count, loff_t *ppos)
750 struct inode * inode = file->f_path.dentry->d_inode;
753 struct task_struct *task = get_proc_task(inode);
759 if (count > PROC_BLOCK_SIZE)
760 count = PROC_BLOCK_SIZE;
763 if (!(page = __get_free_page(GFP_TEMPORARY)))
766 length = PROC_I(inode)->op.proc_read(task, (char*)page);
769 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
772 put_task_struct(task);
777 static const struct file_operations proc_info_file_operations = {
778 .read = proc_info_read,
779 .llseek = generic_file_llseek,
782 static int proc_single_show(struct seq_file *m, void *v)
784 struct inode *inode = m->private;
785 struct pid_namespace *ns;
787 struct task_struct *task;
790 ns = inode->i_sb->s_fs_info;
791 pid = proc_pid(inode);
792 task = get_pid_task(pid, PIDTYPE_PID);
796 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
798 put_task_struct(task);
802 static int proc_single_open(struct inode *inode, struct file *filp)
804 return single_open(filp, proc_single_show, inode);
807 static const struct file_operations proc_single_file_operations = {
808 .open = proc_single_open,
811 .release = single_release,
814 static int mem_open(struct inode* inode, struct file* file)
816 file->private_data = (void*)((long)current->self_exec_id);
817 /* OK to pass negative loff_t, we can catch out-of-range */
818 file->f_mode |= FMODE_UNSIGNED_OFFSET;
822 static ssize_t mem_read(struct file * file, char __user * buf,
823 size_t count, loff_t *ppos)
825 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
827 unsigned long src = *ppos;
829 struct mm_struct *mm;
835 page = (char *)__get_free_page(GFP_TEMPORARY);
839 mm = check_mem_permission(task);
846 if (file->private_data != (void*)((long)current->self_exec_id))
852 int this_len, retval;
854 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
855 retval = access_remote_vm(mm, src, page, this_len, 0);
862 if (copy_to_user(buf, page, retval)) {
877 free_page((unsigned long) page);
879 put_task_struct(task);
884 static ssize_t mem_write(struct file * file, const char __user *buf,
885 size_t count, loff_t *ppos)
889 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
890 unsigned long dst = *ppos;
891 struct mm_struct *mm;
898 page = (char *)__get_free_page(GFP_TEMPORARY);
902 mm = check_mem_permission(task);
903 copied = PTR_ERR(mm);
908 if (file->private_data != (void *)((long)current->self_exec_id))
913 int this_len, retval;
915 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
916 if (copy_from_user(page, buf, this_len)) {
920 retval = access_remote_vm(mm, dst, page, this_len, 1);
936 free_page((unsigned long) page);
938 put_task_struct(task);
943 loff_t mem_lseek(struct file *file, loff_t offset, int orig)
947 file->f_pos = offset;
950 file->f_pos += offset;
955 force_successful_syscall_return();
959 static const struct file_operations proc_mem_operations = {
966 static ssize_t environ_read(struct file *file, char __user *buf,
967 size_t count, loff_t *ppos)
969 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
971 unsigned long src = *ppos;
973 struct mm_struct *mm;
979 page = (char *)__get_free_page(GFP_TEMPORARY);
984 mm = mm_for_maps(task);
986 if (!mm || IS_ERR(mm))
991 int this_len, retval, max_len;
993 this_len = mm->env_end - (mm->env_start + src);
998 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
999 this_len = (this_len > max_len) ? max_len : this_len;
1001 retval = access_process_vm(task, (mm->env_start + src),
1009 if (copy_to_user(buf, page, retval)) {
1023 free_page((unsigned long) page);
1025 put_task_struct(task);
1030 static const struct file_operations proc_environ_operations = {
1031 .read = environ_read,
1032 .llseek = generic_file_llseek,
1035 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
1036 size_t count, loff_t *ppos)
1038 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1039 char buffer[PROC_NUMBUF];
1041 int oom_adjust = OOM_DISABLE;
1042 unsigned long flags;
1047 if (lock_task_sighand(task, &flags)) {
1048 oom_adjust = task->signal->oom_adj;
1049 unlock_task_sighand(task, &flags);
1052 put_task_struct(task);
1054 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
1056 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1059 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1060 size_t count, loff_t *ppos)
1062 struct task_struct *task;
1063 char buffer[PROC_NUMBUF];
1065 unsigned long flags;
1068 memset(buffer, 0, sizeof(buffer));
1069 if (count > sizeof(buffer) - 1)
1070 count = sizeof(buffer) - 1;
1071 if (copy_from_user(buffer, buf, count)) {
1076 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
1079 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
1080 oom_adjust != OOM_DISABLE) {
1085 task = get_proc_task(file->f_path.dentry->d_inode);
1097 if (!lock_task_sighand(task, &flags)) {
1102 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
1107 if (oom_adjust != task->signal->oom_adj) {
1108 if (oom_adjust == OOM_DISABLE)
1109 atomic_inc(&task->mm->oom_disable_count);
1110 if (task->signal->oom_adj == OOM_DISABLE)
1111 atomic_dec(&task->mm->oom_disable_count);
1115 * Warn that /proc/pid/oom_adj is deprecated, see
1116 * Documentation/feature-removal-schedule.txt.
1118 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, "
1119 "please use /proc/%d/oom_score_adj instead.\n",
1120 current->comm, task_pid_nr(current),
1121 task_pid_nr(task), task_pid_nr(task));
1122 task->signal->oom_adj = oom_adjust;
1124 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1125 * value is always attainable.
1127 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1128 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1130 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1133 unlock_task_sighand(task, &flags);
1136 put_task_struct(task);
1138 return err < 0 ? err : count;
1141 static const struct file_operations proc_oom_adjust_operations = {
1142 .read = oom_adjust_read,
1143 .write = oom_adjust_write,
1144 .llseek = generic_file_llseek,
1147 static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1148 size_t count, loff_t *ppos)
1150 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1151 char buffer[PROC_NUMBUF];
1152 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1153 unsigned long flags;
1158 if (lock_task_sighand(task, &flags)) {
1159 oom_score_adj = task->signal->oom_score_adj;
1160 unlock_task_sighand(task, &flags);
1162 put_task_struct(task);
1163 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1164 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1167 static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1168 size_t count, loff_t *ppos)
1170 struct task_struct *task;
1171 char buffer[PROC_NUMBUF];
1172 unsigned long flags;
1176 memset(buffer, 0, sizeof(buffer));
1177 if (count > sizeof(buffer) - 1)
1178 count = sizeof(buffer) - 1;
1179 if (copy_from_user(buffer, buf, count)) {
1184 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
1187 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
1188 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1193 task = get_proc_task(file->f_path.dentry->d_inode);
1205 if (!lock_task_sighand(task, &flags)) {
1210 if (oom_score_adj < task->signal->oom_score_adj_min &&
1211 !capable(CAP_SYS_RESOURCE)) {
1216 if (oom_score_adj != task->signal->oom_score_adj) {
1217 if (oom_score_adj == OOM_SCORE_ADJ_MIN)
1218 atomic_inc(&task->mm->oom_disable_count);
1219 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1220 atomic_dec(&task->mm->oom_disable_count);
1222 task->signal->oom_score_adj = oom_score_adj;
1223 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1224 task->signal->oom_score_adj_min = oom_score_adj;
1226 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1227 * always attainable.
1229 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1230 task->signal->oom_adj = OOM_DISABLE;
1232 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1235 unlock_task_sighand(task, &flags);
1238 put_task_struct(task);
1240 return err < 0 ? err : count;
1243 static const struct file_operations proc_oom_score_adj_operations = {
1244 .read = oom_score_adj_read,
1245 .write = oom_score_adj_write,
1246 .llseek = default_llseek,
1249 #ifdef CONFIG_AUDITSYSCALL
1250 #define TMPBUFLEN 21
1251 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1252 size_t count, loff_t *ppos)
1254 struct inode * inode = file->f_path.dentry->d_inode;
1255 struct task_struct *task = get_proc_task(inode);
1257 char tmpbuf[TMPBUFLEN];
1261 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1262 audit_get_loginuid(task));
1263 put_task_struct(task);
1264 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1267 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1268 size_t count, loff_t *ppos)
1270 struct inode * inode = file->f_path.dentry->d_inode;
1275 if (!capable(CAP_AUDIT_CONTROL))
1279 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1285 if (count >= PAGE_SIZE)
1286 count = PAGE_SIZE - 1;
1289 /* No partial writes. */
1292 page = (char*)__get_free_page(GFP_TEMPORARY);
1296 if (copy_from_user(page, buf, count))
1300 loginuid = simple_strtoul(page, &tmp, 10);
1306 length = audit_set_loginuid(current, loginuid);
1307 if (likely(length == 0))
1311 free_page((unsigned long) page);
1315 static const struct file_operations proc_loginuid_operations = {
1316 .read = proc_loginuid_read,
1317 .write = proc_loginuid_write,
1318 .llseek = generic_file_llseek,
1321 static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1322 size_t count, loff_t *ppos)
1324 struct inode * inode = file->f_path.dentry->d_inode;
1325 struct task_struct *task = get_proc_task(inode);
1327 char tmpbuf[TMPBUFLEN];
1331 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1332 audit_get_sessionid(task));
1333 put_task_struct(task);
1334 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1337 static const struct file_operations proc_sessionid_operations = {
1338 .read = proc_sessionid_read,
1339 .llseek = generic_file_llseek,
1343 #ifdef CONFIG_FAULT_INJECTION
1344 static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1345 size_t count, loff_t *ppos)
1347 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1348 char buffer[PROC_NUMBUF];
1354 make_it_fail = task->make_it_fail;
1355 put_task_struct(task);
1357 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
1359 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1362 static ssize_t proc_fault_inject_write(struct file * file,
1363 const char __user * buf, size_t count, loff_t *ppos)
1365 struct task_struct *task;
1366 char buffer[PROC_NUMBUF], *end;
1369 if (!capable(CAP_SYS_RESOURCE))
1371 memset(buffer, 0, sizeof(buffer));
1372 if (count > sizeof(buffer) - 1)
1373 count = sizeof(buffer) - 1;
1374 if (copy_from_user(buffer, buf, count))
1376 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1379 task = get_proc_task(file->f_dentry->d_inode);
1382 task->make_it_fail = make_it_fail;
1383 put_task_struct(task);
1388 static const struct file_operations proc_fault_inject_operations = {
1389 .read = proc_fault_inject_read,
1390 .write = proc_fault_inject_write,
1391 .llseek = generic_file_llseek,
1396 #ifdef CONFIG_SCHED_DEBUG
1398 * Print out various scheduling related per-task fields:
1400 static int sched_show(struct seq_file *m, void *v)
1402 struct inode *inode = m->private;
1403 struct task_struct *p;
1405 p = get_proc_task(inode);
1408 proc_sched_show_task(p, m);
1416 sched_write(struct file *file, const char __user *buf,
1417 size_t count, loff_t *offset)
1419 struct inode *inode = file->f_path.dentry->d_inode;
1420 struct task_struct *p;
1422 p = get_proc_task(inode);
1425 proc_sched_set_task(p);
1432 static int sched_open(struct inode *inode, struct file *filp)
1434 return single_open(filp, sched_show, inode);
1437 static const struct file_operations proc_pid_sched_operations = {
1440 .write = sched_write,
1441 .llseek = seq_lseek,
1442 .release = single_release,
1447 #ifdef CONFIG_SCHED_AUTOGROUP
1449 * Print out autogroup related information:
1451 static int sched_autogroup_show(struct seq_file *m, void *v)
1453 struct inode *inode = m->private;
1454 struct task_struct *p;
1456 p = get_proc_task(inode);
1459 proc_sched_autogroup_show_task(p, m);
1467 sched_autogroup_write(struct file *file, const char __user *buf,
1468 size_t count, loff_t *offset)
1470 struct inode *inode = file->f_path.dentry->d_inode;
1471 struct task_struct *p;
1472 char buffer[PROC_NUMBUF];
1476 memset(buffer, 0, sizeof(buffer));
1477 if (count > sizeof(buffer) - 1)
1478 count = sizeof(buffer) - 1;
1479 if (copy_from_user(buffer, buf, count))
1482 err = kstrtoint(strstrip(buffer), 0, &nice);
1486 p = get_proc_task(inode);
1491 err = proc_sched_autogroup_set_nice(p, &err);
1500 static int sched_autogroup_open(struct inode *inode, struct file *filp)
1504 ret = single_open(filp, sched_autogroup_show, NULL);
1506 struct seq_file *m = filp->private_data;
1513 static const struct file_operations proc_pid_sched_autogroup_operations = {
1514 .open = sched_autogroup_open,
1516 .write = sched_autogroup_write,
1517 .llseek = seq_lseek,
1518 .release = single_release,
1521 #endif /* CONFIG_SCHED_AUTOGROUP */
1523 static ssize_t comm_write(struct file *file, const char __user *buf,
1524 size_t count, loff_t *offset)
1526 struct inode *inode = file->f_path.dentry->d_inode;
1527 struct task_struct *p;
1528 char buffer[TASK_COMM_LEN];
1530 memset(buffer, 0, sizeof(buffer));
1531 if (count > sizeof(buffer) - 1)
1532 count = sizeof(buffer) - 1;
1533 if (copy_from_user(buffer, buf, count))
1536 p = get_proc_task(inode);
1540 if (same_thread_group(current, p))
1541 set_task_comm(p, buffer);
1550 static int comm_show(struct seq_file *m, void *v)
1552 struct inode *inode = m->private;
1553 struct task_struct *p;
1555 p = get_proc_task(inode);
1560 seq_printf(m, "%s\n", p->comm);
1568 static int comm_open(struct inode *inode, struct file *filp)
1570 return single_open(filp, comm_show, inode);
1573 static const struct file_operations proc_pid_set_comm_operations = {
1576 .write = comm_write,
1577 .llseek = seq_lseek,
1578 .release = single_release,
1581 static int proc_exe_link(struct inode *inode, struct path *exe_path)
1583 struct task_struct *task;
1584 struct mm_struct *mm;
1585 struct file *exe_file;
1587 task = get_proc_task(inode);
1590 mm = get_task_mm(task);
1591 put_task_struct(task);
1594 exe_file = get_mm_exe_file(mm);
1597 *exe_path = exe_file->f_path;
1598 path_get(&exe_file->f_path);
1605 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1607 struct inode *inode = dentry->d_inode;
1608 int error = -EACCES;
1610 /* We don't need a base pointer in the /proc filesystem */
1611 path_put(&nd->path);
1613 /* Are we allowed to snoop on the tasks file descriptors? */
1614 if (!proc_fd_access_allowed(inode))
1617 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1619 return ERR_PTR(error);
1622 static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1624 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
1631 pathname = d_path(path, tmp, PAGE_SIZE);
1632 len = PTR_ERR(pathname);
1633 if (IS_ERR(pathname))
1635 len = tmp + PAGE_SIZE - 1 - pathname;
1639 if (copy_to_user(buffer, pathname, len))
1642 free_page((unsigned long)tmp);
1646 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1648 int error = -EACCES;
1649 struct inode *inode = dentry->d_inode;
1652 /* Are we allowed to snoop on the tasks file descriptors? */
1653 if (!proc_fd_access_allowed(inode))
1656 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1660 error = do_proc_readlink(&path, buffer, buflen);
1666 static const struct inode_operations proc_pid_link_inode_operations = {
1667 .readlink = proc_pid_readlink,
1668 .follow_link = proc_pid_follow_link,
1669 .setattr = proc_setattr,
1673 /* building an inode */
1675 static int task_dumpable(struct task_struct *task)
1678 struct mm_struct *mm;
1683 dumpable = get_dumpable(mm);
1690 struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
1692 struct inode * inode;
1693 struct proc_inode *ei;
1694 const struct cred *cred;
1696 /* We need a new inode */
1698 inode = new_inode(sb);
1704 inode->i_ino = get_next_ino();
1705 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1706 inode->i_op = &proc_def_inode_operations;
1709 * grab the reference to task.
1711 ei->pid = get_task_pid(task, PIDTYPE_PID);
1715 if (task_dumpable(task)) {
1717 cred = __task_cred(task);
1718 inode->i_uid = cred->euid;
1719 inode->i_gid = cred->egid;
1722 security_task_to_inode(task, inode);
1732 int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1734 struct inode *inode = dentry->d_inode;
1735 struct task_struct *task;
1736 const struct cred *cred;
1738 generic_fillattr(inode, stat);
1743 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1745 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1746 task_dumpable(task)) {
1747 cred = __task_cred(task);
1748 stat->uid = cred->euid;
1749 stat->gid = cred->egid;
1759 * Exceptional case: normally we are not allowed to unhash a busy
1760 * directory. In this case, however, we can do it - no aliasing problems
1761 * due to the way we treat inodes.
1763 * Rewrite the inode's ownerships here because the owning task may have
1764 * performed a setuid(), etc.
1766 * Before the /proc/pid/status file was created the only way to read
1767 * the effective uid of a /process was to stat /proc/pid. Reading
1768 * /proc/pid/status is slow enough that procps and other packages
1769 * kept stating /proc/pid. To keep the rules in /proc simple I have
1770 * made this apply to all per process world readable and executable
1773 int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1775 struct inode *inode;
1776 struct task_struct *task;
1777 const struct cred *cred;
1779 if (nd && nd->flags & LOOKUP_RCU)
1782 inode = dentry->d_inode;
1783 task = get_proc_task(inode);
1786 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1787 task_dumpable(task)) {
1789 cred = __task_cred(task);
1790 inode->i_uid = cred->euid;
1791 inode->i_gid = cred->egid;
1797 inode->i_mode &= ~(S_ISUID | S_ISGID);
1798 security_task_to_inode(task, inode);
1799 put_task_struct(task);
1806 static int pid_delete_dentry(const struct dentry * dentry)
1808 /* Is the task we represent dead?
1809 * If so, then don't put the dentry on the lru list,
1810 * kill it immediately.
1812 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1815 const struct dentry_operations pid_dentry_operations =
1817 .d_revalidate = pid_revalidate,
1818 .d_delete = pid_delete_dentry,
1824 * Fill a directory entry.
1826 * If possible create the dcache entry and derive our inode number and
1827 * file type from dcache entry.
1829 * Since all of the proc inode numbers are dynamically generated, the inode
1830 * numbers do not exist until the inode is cache. This means creating the
1831 * the dcache entry in readdir is necessary to keep the inode numbers
1832 * reported by readdir in sync with the inode numbers reported
1835 int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1836 const char *name, int len,
1837 instantiate_t instantiate, struct task_struct *task, const void *ptr)
1839 struct dentry *child, *dir = filp->f_path.dentry;
1840 struct inode *inode;
1843 unsigned type = DT_UNKNOWN;
1847 qname.hash = full_name_hash(name, len);
1849 child = d_lookup(dir, &qname);
1852 new = d_alloc(dir, &qname);
1854 child = instantiate(dir->d_inode, new, task, ptr);
1861 if (!child || IS_ERR(child) || !child->d_inode)
1862 goto end_instantiate;
1863 inode = child->d_inode;
1866 type = inode->i_mode >> 12;
1871 ino = find_inode_number(dir, &qname);
1874 return filldir(dirent, name, len, filp->f_pos, ino, type);
1877 static unsigned name_to_int(struct dentry *dentry)
1879 const char *name = dentry->d_name.name;
1880 int len = dentry->d_name.len;
1883 if (len > 1 && *name == '0')
1886 unsigned c = *name++ - '0';
1889 if (n >= (~0U-9)/10)
1899 #define PROC_FDINFO_MAX 64
1901 static int proc_fd_info(struct inode *inode, struct path *path, char *info)
1903 struct task_struct *task = get_proc_task(inode);
1904 struct files_struct *files = NULL;
1906 int fd = proc_fd(inode);
1909 files = get_files_struct(task);
1910 put_task_struct(task);
1914 * We are not taking a ref to the file structure, so we must
1917 spin_lock(&files->file_lock);
1918 file = fcheck_files(files, fd);
1921 *path = file->f_path;
1922 path_get(&file->f_path);
1925 snprintf(info, PROC_FDINFO_MAX,
1928 (long long) file->f_pos,
1930 spin_unlock(&files->file_lock);
1931 put_files_struct(files);
1934 spin_unlock(&files->file_lock);
1935 put_files_struct(files);
1940 static int proc_fd_link(struct inode *inode, struct path *path)
1942 return proc_fd_info(inode, path, NULL);
1945 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1947 struct inode *inode;
1948 struct task_struct *task;
1950 struct files_struct *files;
1951 const struct cred *cred;
1953 if (nd && nd->flags & LOOKUP_RCU)
1956 inode = dentry->d_inode;
1957 task = get_proc_task(inode);
1958 fd = proc_fd(inode);
1961 files = get_files_struct(task);
1964 if (fcheck_files(files, fd)) {
1966 put_files_struct(files);
1967 if (task_dumpable(task)) {
1969 cred = __task_cred(task);
1970 inode->i_uid = cred->euid;
1971 inode->i_gid = cred->egid;
1977 inode->i_mode &= ~(S_ISUID | S_ISGID);
1978 security_task_to_inode(task, inode);
1979 put_task_struct(task);
1983 put_files_struct(files);
1985 put_task_struct(task);
1991 static const struct dentry_operations tid_fd_dentry_operations =
1993 .d_revalidate = tid_fd_revalidate,
1994 .d_delete = pid_delete_dentry,
1997 static struct dentry *proc_fd_instantiate(struct inode *dir,
1998 struct dentry *dentry, struct task_struct *task, const void *ptr)
2000 unsigned fd = *(const unsigned *)ptr;
2002 struct files_struct *files;
2003 struct inode *inode;
2004 struct proc_inode *ei;
2005 struct dentry *error = ERR_PTR(-ENOENT);
2007 inode = proc_pid_make_inode(dir->i_sb, task);
2012 files = get_files_struct(task);
2015 inode->i_mode = S_IFLNK;
2018 * We are not taking a ref to the file structure, so we must
2021 spin_lock(&files->file_lock);
2022 file = fcheck_files(files, fd);
2025 if (file->f_mode & FMODE_READ)
2026 inode->i_mode |= S_IRUSR | S_IXUSR;
2027 if (file->f_mode & FMODE_WRITE)
2028 inode->i_mode |= S_IWUSR | S_IXUSR;
2029 spin_unlock(&files->file_lock);
2030 put_files_struct(files);
2032 inode->i_op = &proc_pid_link_inode_operations;
2034 ei->op.proc_get_link = proc_fd_link;
2035 d_set_d_op(dentry, &tid_fd_dentry_operations);
2036 d_add(dentry, inode);
2037 /* Close the race of the process dying before we return the dentry */
2038 if (tid_fd_revalidate(dentry, NULL))
2044 spin_unlock(&files->file_lock);
2045 put_files_struct(files);
2051 static struct dentry *proc_lookupfd_common(struct inode *dir,
2052 struct dentry *dentry,
2053 instantiate_t instantiate)
2055 struct task_struct *task = get_proc_task(dir);
2056 unsigned fd = name_to_int(dentry);
2057 struct dentry *result = ERR_PTR(-ENOENT);
2064 result = instantiate(dir, dentry, task, &fd);
2066 put_task_struct(task);
2071 static int proc_readfd_common(struct file * filp, void * dirent,
2072 filldir_t filldir, instantiate_t instantiate)
2074 struct dentry *dentry = filp->f_path.dentry;
2075 struct inode *inode = dentry->d_inode;
2076 struct task_struct *p = get_proc_task(inode);
2077 unsigned int fd, ino;
2079 struct files_struct * files;
2089 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
2093 ino = parent_ino(dentry);
2094 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2098 files = get_files_struct(p);
2102 for (fd = filp->f_pos-2;
2103 fd < files_fdtable(files)->max_fds;
2104 fd++, filp->f_pos++) {
2105 char name[PROC_NUMBUF];
2108 if (!fcheck_files(files, fd))
2112 len = snprintf(name, sizeof(name), "%d", fd);
2113 if (proc_fill_cache(filp, dirent, filldir,
2114 name, len, instantiate,
2122 put_files_struct(files);
2130 static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2131 struct nameidata *nd)
2133 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2136 static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2138 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2141 static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2142 size_t len, loff_t *ppos)
2144 char tmp[PROC_FDINFO_MAX];
2145 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
2147 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2151 static const struct file_operations proc_fdinfo_file_operations = {
2152 .open = nonseekable_open,
2153 .read = proc_fdinfo_read,
2154 .llseek = no_llseek,
2157 static const struct file_operations proc_fd_operations = {
2158 .read = generic_read_dir,
2159 .readdir = proc_readfd,
2160 .llseek = default_llseek,
2164 * /proc/pid/fd needs a special permission handler so that a process can still
2165 * access /proc/self/fd after it has executed a setuid().
2167 static int proc_fd_permission(struct inode *inode, int mask, unsigned int flags)
2171 if (flags & IPERM_FLAG_RCU)
2173 rv = generic_permission(inode, mask, flags, NULL);
2176 if (task_pid(current) == proc_pid(inode))
2182 * proc directories can do almost nothing..
2184 static const struct inode_operations proc_fd_inode_operations = {
2185 .lookup = proc_lookupfd,
2186 .permission = proc_fd_permission,
2187 .setattr = proc_setattr,
2190 static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2191 struct dentry *dentry, struct task_struct *task, const void *ptr)
2193 unsigned fd = *(unsigned *)ptr;
2194 struct inode *inode;
2195 struct proc_inode *ei;
2196 struct dentry *error = ERR_PTR(-ENOENT);
2198 inode = proc_pid_make_inode(dir->i_sb, task);
2203 inode->i_mode = S_IFREG | S_IRUSR;
2204 inode->i_fop = &proc_fdinfo_file_operations;
2205 d_set_d_op(dentry, &tid_fd_dentry_operations);
2206 d_add(dentry, inode);
2207 /* Close the race of the process dying before we return the dentry */
2208 if (tid_fd_revalidate(dentry, NULL))
2215 static struct dentry *proc_lookupfdinfo(struct inode *dir,
2216 struct dentry *dentry,
2217 struct nameidata *nd)
2219 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2222 static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2224 return proc_readfd_common(filp, dirent, filldir,
2225 proc_fdinfo_instantiate);
2228 static const struct file_operations proc_fdinfo_operations = {
2229 .read = generic_read_dir,
2230 .readdir = proc_readfdinfo,
2231 .llseek = default_llseek,
2235 * proc directories can do almost nothing..
2237 static const struct inode_operations proc_fdinfo_inode_operations = {
2238 .lookup = proc_lookupfdinfo,
2239 .setattr = proc_setattr,
2243 static struct dentry *proc_pident_instantiate(struct inode *dir,
2244 struct dentry *dentry, struct task_struct *task, const void *ptr)
2246 const struct pid_entry *p = ptr;
2247 struct inode *inode;
2248 struct proc_inode *ei;
2249 struct dentry *error = ERR_PTR(-ENOENT);
2251 inode = proc_pid_make_inode(dir->i_sb, task);
2256 inode->i_mode = p->mode;
2257 if (S_ISDIR(inode->i_mode))
2258 inode->i_nlink = 2; /* Use getattr to fix if necessary */
2260 inode->i_op = p->iop;
2262 inode->i_fop = p->fop;
2264 d_set_d_op(dentry, &pid_dentry_operations);
2265 d_add(dentry, inode);
2266 /* Close the race of the process dying before we return the dentry */
2267 if (pid_revalidate(dentry, NULL))
2273 static struct dentry *proc_pident_lookup(struct inode *dir,
2274 struct dentry *dentry,
2275 const struct pid_entry *ents,
2278 struct dentry *error;
2279 struct task_struct *task = get_proc_task(dir);
2280 const struct pid_entry *p, *last;
2282 error = ERR_PTR(-ENOENT);
2288 * Yes, it does not scale. And it should not. Don't add
2289 * new entries into /proc/<tgid>/ without very good reasons.
2291 last = &ents[nents - 1];
2292 for (p = ents; p <= last; p++) {
2293 if (p->len != dentry->d_name.len)
2295 if (!memcmp(dentry->d_name.name, p->name, p->len))
2301 error = proc_pident_instantiate(dir, dentry, task, p);
2303 put_task_struct(task);
2308 static int proc_pident_fill_cache(struct file *filp, void *dirent,
2309 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2311 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2312 proc_pident_instantiate, task, p);
2315 static int proc_pident_readdir(struct file *filp,
2316 void *dirent, filldir_t filldir,
2317 const struct pid_entry *ents, unsigned int nents)
2320 struct dentry *dentry = filp->f_path.dentry;
2321 struct inode *inode = dentry->d_inode;
2322 struct task_struct *task = get_proc_task(inode);
2323 const struct pid_entry *p, *last;
2336 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2342 ino = parent_ino(dentry);
2343 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2355 last = &ents[nents - 1];
2357 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
2366 put_task_struct(task);
2371 #ifdef CONFIG_SECURITY
2372 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2373 size_t count, loff_t *ppos)
2375 struct inode * inode = file->f_path.dentry->d_inode;
2378 struct task_struct *task = get_proc_task(inode);
2383 length = security_getprocattr(task,
2384 (char*)file->f_path.dentry->d_name.name,
2386 put_task_struct(task);
2388 length = simple_read_from_buffer(buf, count, ppos, p, length);
2393 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2394 size_t count, loff_t *ppos)
2396 struct inode * inode = file->f_path.dentry->d_inode;
2399 struct task_struct *task = get_proc_task(inode);
2404 if (count > PAGE_SIZE)
2407 /* No partial writes. */
2413 page = (char*)__get_free_page(GFP_TEMPORARY);
2418 if (copy_from_user(page, buf, count))
2421 /* Guard against adverse ptrace interaction */
2422 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
2426 length = security_setprocattr(task,
2427 (char*)file->f_path.dentry->d_name.name,
2428 (void*)page, count);
2429 mutex_unlock(&task->signal->cred_guard_mutex);
2431 free_page((unsigned long) page);
2433 put_task_struct(task);
2438 static const struct file_operations proc_pid_attr_operations = {
2439 .read = proc_pid_attr_read,
2440 .write = proc_pid_attr_write,
2441 .llseek = generic_file_llseek,
2444 static const struct pid_entry attr_dir_stuff[] = {
2445 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2446 REG("prev", S_IRUGO, proc_pid_attr_operations),
2447 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2448 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2449 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2450 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2453 static int proc_attr_dir_readdir(struct file * filp,
2454 void * dirent, filldir_t filldir)
2456 return proc_pident_readdir(filp,dirent,filldir,
2457 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
2460 static const struct file_operations proc_attr_dir_operations = {
2461 .read = generic_read_dir,
2462 .readdir = proc_attr_dir_readdir,
2463 .llseek = default_llseek,
2466 static struct dentry *proc_attr_dir_lookup(struct inode *dir,
2467 struct dentry *dentry, struct nameidata *nd)
2469 return proc_pident_lookup(dir, dentry,
2470 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
2473 static const struct inode_operations proc_attr_dir_inode_operations = {
2474 .lookup = proc_attr_dir_lookup,
2475 .getattr = pid_getattr,
2476 .setattr = proc_setattr,
2481 #ifdef CONFIG_ELF_CORE
2482 static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2483 size_t count, loff_t *ppos)
2485 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2486 struct mm_struct *mm;
2487 char buffer[PROC_NUMBUF];
2495 mm = get_task_mm(task);
2497 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2498 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2499 MMF_DUMP_FILTER_SHIFT));
2501 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2504 put_task_struct(task);
2509 static ssize_t proc_coredump_filter_write(struct file *file,
2510 const char __user *buf,
2514 struct task_struct *task;
2515 struct mm_struct *mm;
2516 char buffer[PROC_NUMBUF], *end;
2523 memset(buffer, 0, sizeof(buffer));
2524 if (count > sizeof(buffer) - 1)
2525 count = sizeof(buffer) - 1;
2526 if (copy_from_user(buffer, buf, count))
2530 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2533 if (end - buffer == 0)
2537 task = get_proc_task(file->f_dentry->d_inode);
2542 mm = get_task_mm(task);
2546 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2548 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2550 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2555 put_task_struct(task);
2560 static const struct file_operations proc_coredump_filter_operations = {
2561 .read = proc_coredump_filter_read,
2562 .write = proc_coredump_filter_write,
2563 .llseek = generic_file_llseek,
2570 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2573 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2574 pid_t tgid = task_tgid_nr_ns(current, ns);
2575 char tmp[PROC_NUMBUF];
2578 sprintf(tmp, "%d", tgid);
2579 return vfs_readlink(dentry,buffer,buflen,tmp);
2582 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2584 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
2585 pid_t tgid = task_tgid_nr_ns(current, ns);
2586 char *name = ERR_PTR(-ENOENT);
2590 name = ERR_PTR(-ENOMEM);
2592 sprintf(name, "%d", tgid);
2594 nd_set_link(nd, name);
2598 static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2601 char *s = nd_get_link(nd);
2606 static const struct inode_operations proc_self_inode_operations = {
2607 .readlink = proc_self_readlink,
2608 .follow_link = proc_self_follow_link,
2609 .put_link = proc_self_put_link,
2615 * These are the directory entries in the root directory of /proc
2616 * that properly belong to the /proc filesystem, as they describe
2617 * describe something that is process related.
2619 static const struct pid_entry proc_base_stuff[] = {
2620 NOD("self", S_IFLNK|S_IRWXUGO,
2621 &proc_self_inode_operations, NULL, {}),
2624 static struct dentry *proc_base_instantiate(struct inode *dir,
2625 struct dentry *dentry, struct task_struct *task, const void *ptr)
2627 const struct pid_entry *p = ptr;
2628 struct inode *inode;
2629 struct proc_inode *ei;
2630 struct dentry *error;
2632 /* Allocate the inode */
2633 error = ERR_PTR(-ENOMEM);
2634 inode = new_inode(dir->i_sb);
2638 /* Initialize the inode */
2640 inode->i_ino = get_next_ino();
2641 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
2644 * grab the reference to the task.
2646 ei->pid = get_task_pid(task, PIDTYPE_PID);
2650 inode->i_mode = p->mode;
2651 if (S_ISDIR(inode->i_mode))
2653 if (S_ISLNK(inode->i_mode))
2656 inode->i_op = p->iop;
2658 inode->i_fop = p->fop;
2660 d_add(dentry, inode);
2669 static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2671 struct dentry *error;
2672 struct task_struct *task = get_proc_task(dir);
2673 const struct pid_entry *p, *last;
2675 error = ERR_PTR(-ENOENT);
2680 /* Lookup the directory entry */
2681 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2682 for (p = proc_base_stuff; p <= last; p++) {
2683 if (p->len != dentry->d_name.len)
2685 if (!memcmp(dentry->d_name.name, p->name, p->len))
2691 error = proc_base_instantiate(dir, dentry, task, p);
2694 put_task_struct(task);
2699 static int proc_base_fill_cache(struct file *filp, void *dirent,
2700 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
2702 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2703 proc_base_instantiate, task, p);
2706 #ifdef CONFIG_TASK_IO_ACCOUNTING
2707 static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2709 struct task_io_accounting acct = task->ioac;
2710 unsigned long flags;
2712 if (whole && lock_task_sighand(task, &flags)) {
2713 struct task_struct *t = task;
2715 task_io_accounting_add(&acct, &task->signal->ioac);
2716 while_each_thread(task, t)
2717 task_io_accounting_add(&acct, &t->ioac);
2719 unlock_task_sighand(task, &flags);
2721 return sprintf(buffer,
2726 "read_bytes: %llu\n"
2727 "write_bytes: %llu\n"
2728 "cancelled_write_bytes: %llu\n",
2729 (unsigned long long)acct.rchar,
2730 (unsigned long long)acct.wchar,
2731 (unsigned long long)acct.syscr,
2732 (unsigned long long)acct.syscw,
2733 (unsigned long long)acct.read_bytes,
2734 (unsigned long long)acct.write_bytes,
2735 (unsigned long long)acct.cancelled_write_bytes);
2738 static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2740 return do_io_accounting(task, buffer, 0);
2743 static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2745 return do_io_accounting(task, buffer, 1);
2747 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2749 static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2750 struct pid *pid, struct task_struct *task)
2752 int err = lock_trace(task);
2754 seq_printf(m, "%08x\n", task->personality);
2763 static const struct file_operations proc_task_operations;
2764 static const struct inode_operations proc_task_inode_operations;
2766 static const struct pid_entry tgid_base_stuff[] = {
2767 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2768 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2769 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
2770 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
2772 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
2774 REG("environ", S_IRUSR, proc_environ_operations),
2775 INF("auxv", S_IRUSR, proc_pid_auxv),
2776 ONE("status", S_IRUGO, proc_pid_status),
2777 ONE("personality", S_IRUGO, proc_pid_personality),
2778 INF("limits", S_IRUGO, proc_pid_limits),
2779 #ifdef CONFIG_SCHED_DEBUG
2780 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
2782 #ifdef CONFIG_SCHED_AUTOGROUP
2783 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
2785 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
2786 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2787 INF("syscall", S_IRUGO, proc_pid_syscall),
2789 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2790 ONE("stat", S_IRUGO, proc_tgid_stat),
2791 ONE("statm", S_IRUGO, proc_pid_statm),
2792 REG("maps", S_IRUGO, proc_maps_operations),
2794 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
2796 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2797 LNK("cwd", proc_cwd_link),
2798 LNK("root", proc_root_link),
2799 LNK("exe", proc_exe_link),
2800 REG("mounts", S_IRUGO, proc_mounts_operations),
2801 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2802 REG("mountstats", S_IRUSR, proc_mountstats_operations),
2803 #ifdef CONFIG_PROC_PAGE_MONITOR
2804 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2805 REG("smaps", S_IRUGO, proc_smaps_operations),
2806 REG("pagemap", S_IRUGO, proc_pagemap_operations),
2808 #ifdef CONFIG_SECURITY
2809 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
2811 #ifdef CONFIG_KALLSYMS
2812 INF("wchan", S_IRUGO, proc_pid_wchan),
2814 #ifdef CONFIG_STACKTRACE
2815 ONE("stack", S_IRUGO, proc_pid_stack),
2817 #ifdef CONFIG_SCHEDSTATS
2818 INF("schedstat", S_IRUGO, proc_pid_schedstat),
2820 #ifdef CONFIG_LATENCYTOP
2821 REG("latency", S_IRUGO, proc_lstats_operations),
2823 #ifdef CONFIG_PROC_PID_CPUSET
2824 REG("cpuset", S_IRUGO, proc_cpuset_operations),
2826 #ifdef CONFIG_CGROUPS
2827 REG("cgroup", S_IRUGO, proc_cgroup_operations),
2829 INF("oom_score", S_IRUGO, proc_oom_score),
2830 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
2831 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
2832 #ifdef CONFIG_AUDITSYSCALL
2833 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2834 REG("sessionid", S_IRUGO, proc_sessionid_operations),
2836 #ifdef CONFIG_FAULT_INJECTION
2837 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
2839 #ifdef CONFIG_ELF_CORE
2840 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
2842 #ifdef CONFIG_TASK_IO_ACCOUNTING
2843 INF("io", S_IRUGO, proc_tgid_io_accounting),
2847 static int proc_tgid_base_readdir(struct file * filp,
2848 void * dirent, filldir_t filldir)
2850 return proc_pident_readdir(filp,dirent,filldir,
2851 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
2854 static const struct file_operations proc_tgid_base_operations = {
2855 .read = generic_read_dir,
2856 .readdir = proc_tgid_base_readdir,
2857 .llseek = default_llseek,
2860 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
2861 return proc_pident_lookup(dir, dentry,
2862 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
2865 static const struct inode_operations proc_tgid_base_inode_operations = {
2866 .lookup = proc_tgid_base_lookup,
2867 .getattr = pid_getattr,
2868 .setattr = proc_setattr,
2871 static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
2873 struct dentry *dentry, *leader, *dir;
2874 char buf[PROC_NUMBUF];
2878 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2879 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
2881 shrink_dcache_parent(dentry);
2887 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2888 leader = d_hash_and_lookup(mnt->mnt_root, &name);
2893 name.len = strlen(name.name);
2894 dir = d_hash_and_lookup(leader, &name);
2896 goto out_put_leader;
2899 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2900 dentry = d_hash_and_lookup(dir, &name);
2902 shrink_dcache_parent(dentry);
2915 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2916 * @task: task that should be flushed.
2918 * When flushing dentries from proc, one needs to flush them from global
2919 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2920 * in. This call is supposed to do all of this job.
2922 * Looks in the dcache for
2924 * /proc/@tgid/task/@pid
2925 * if either directory is present flushes it and all of it'ts children
2928 * It is safe and reasonable to cache /proc entries for a task until
2929 * that task exits. After that they just clog up the dcache with
2930 * useless entries, possibly causing useful dcache entries to be
2931 * flushed instead. This routine is proved to flush those useless
2932 * dcache entries at process exit time.
2934 * NOTE: This routine is just an optimization so it does not guarantee
2935 * that no dcache entries will exist at process exit time it
2936 * just makes it very unlikely that any will persist.
2939 void proc_flush_task(struct task_struct *task)
2942 struct pid *pid, *tgid;
2945 pid = task_pid(task);
2946 tgid = task_tgid(task);
2948 for (i = 0; i <= pid->level; i++) {
2949 upid = &pid->numbers[i];
2950 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
2951 tgid->numbers[i].nr);
2954 upid = &pid->numbers[pid->level];
2956 pid_ns_release_proc(upid->ns);
2959 static struct dentry *proc_pid_instantiate(struct inode *dir,
2960 struct dentry * dentry,
2961 struct task_struct *task, const void *ptr)
2963 struct dentry *error = ERR_PTR(-ENOENT);
2964 struct inode *inode;
2966 inode = proc_pid_make_inode(dir->i_sb, task);
2970 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2971 inode->i_op = &proc_tgid_base_inode_operations;
2972 inode->i_fop = &proc_tgid_base_operations;
2973 inode->i_flags|=S_IMMUTABLE;
2975 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2976 ARRAY_SIZE(tgid_base_stuff));
2978 d_set_d_op(dentry, &pid_dentry_operations);
2980 d_add(dentry, inode);
2981 /* Close the race of the process dying before we return the dentry */
2982 if (pid_revalidate(dentry, NULL))
2988 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2990 struct dentry *result;
2991 struct task_struct *task;
2993 struct pid_namespace *ns;
2995 result = proc_base_lookup(dir, dentry);
2996 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
2999 tgid = name_to_int(dentry);
3003 ns = dentry->d_sb->s_fs_info;
3005 task = find_task_by_pid_ns(tgid, ns);
3007 get_task_struct(task);
3012 result = proc_pid_instantiate(dir, dentry, task, NULL);
3013 put_task_struct(task);
3019 * Find the first task with tgid >= tgid
3024 struct task_struct *task;
3026 static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3031 put_task_struct(iter.task);
3035 pid = find_ge_pid(iter.tgid, ns);
3037 iter.tgid = pid_nr_ns(pid, ns);
3038 iter.task = pid_task(pid, PIDTYPE_PID);
3039 /* What we to know is if the pid we have find is the
3040 * pid of a thread_group_leader. Testing for task
3041 * being a thread_group_leader is the obvious thing
3042 * todo but there is a window when it fails, due to
3043 * the pid transfer logic in de_thread.
3045 * So we perform the straight forward test of seeing
3046 * if the pid we have found is the pid of a thread
3047 * group leader, and don't worry if the task we have
3048 * found doesn't happen to be a thread group leader.
3049 * As we don't care in the case of readdir.
3051 if (!iter.task || !has_group_leader_pid(iter.task)) {
3055 get_task_struct(iter.task);
3061 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
3063 static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3064 struct tgid_iter iter)
3066 char name[PROC_NUMBUF];
3067 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
3068 return proc_fill_cache(filp, dirent, filldir, name, len,
3069 proc_pid_instantiate, iter.task, NULL);
3072 /* for the /proc/ directory itself, after non-process stuff has been done */
3073 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3076 struct task_struct *reaper;
3077 struct tgid_iter iter;
3078 struct pid_namespace *ns;
3080 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3082 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3084 reaper = get_proc_task(filp->f_path.dentry->d_inode);
3088 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
3089 const struct pid_entry *p = &proc_base_stuff[nr];
3090 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
3094 ns = filp->f_dentry->d_sb->s_fs_info;
3096 iter.tgid = filp->f_pos - TGID_OFFSET;
3097 for (iter = next_tgid(ns, iter);
3099 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3100 filp->f_pos = iter.tgid + TGID_OFFSET;
3101 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3102 put_task_struct(iter.task);
3106 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3108 put_task_struct(reaper);
3116 static const struct pid_entry tid_base_stuff[] = {
3117 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3118 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
3119 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
3120 REG("environ", S_IRUSR, proc_environ_operations),
3121 INF("auxv", S_IRUSR, proc_pid_auxv),
3122 ONE("status", S_IRUGO, proc_pid_status),
3123 ONE("personality", S_IRUGO, proc_pid_personality),
3124 INF("limits", S_IRUGO, proc_pid_limits),
3125 #ifdef CONFIG_SCHED_DEBUG
3126 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
3128 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
3129 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3130 INF("syscall", S_IRUGO, proc_pid_syscall),
3132 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3133 ONE("stat", S_IRUGO, proc_tid_stat),
3134 ONE("statm", S_IRUGO, proc_pid_statm),
3135 REG("maps", S_IRUGO, proc_maps_operations),
3137 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
3139 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3140 LNK("cwd", proc_cwd_link),
3141 LNK("root", proc_root_link),
3142 LNK("exe", proc_exe_link),
3143 REG("mounts", S_IRUGO, proc_mounts_operations),
3144 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3145 #ifdef CONFIG_PROC_PAGE_MONITOR
3146 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3147 REG("smaps", S_IRUGO, proc_smaps_operations),
3148 REG("pagemap", S_IRUGO, proc_pagemap_operations),
3150 #ifdef CONFIG_SECURITY
3151 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
3153 #ifdef CONFIG_KALLSYMS
3154 INF("wchan", S_IRUGO, proc_pid_wchan),
3156 #ifdef CONFIG_STACKTRACE
3157 ONE("stack", S_IRUGO, proc_pid_stack),
3159 #ifdef CONFIG_SCHEDSTATS
3160 INF("schedstat", S_IRUGO, proc_pid_schedstat),
3162 #ifdef CONFIG_LATENCYTOP
3163 REG("latency", S_IRUGO, proc_lstats_operations),
3165 #ifdef CONFIG_PROC_PID_CPUSET
3166 REG("cpuset", S_IRUGO, proc_cpuset_operations),
3168 #ifdef CONFIG_CGROUPS
3169 REG("cgroup", S_IRUGO, proc_cgroup_operations),
3171 INF("oom_score", S_IRUGO, proc_oom_score),
3172 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
3173 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
3174 #ifdef CONFIG_AUDITSYSCALL
3175 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3176 REG("sessionid", S_IRUGO, proc_sessionid_operations),
3178 #ifdef CONFIG_FAULT_INJECTION
3179 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
3181 #ifdef CONFIG_TASK_IO_ACCOUNTING
3182 INF("io", S_IRUGO, proc_tid_io_accounting),
3186 static int proc_tid_base_readdir(struct file * filp,
3187 void * dirent, filldir_t filldir)
3189 return proc_pident_readdir(filp,dirent,filldir,
3190 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3193 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
3194 return proc_pident_lookup(dir, dentry,
3195 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
3198 static const struct file_operations proc_tid_base_operations = {
3199 .read = generic_read_dir,
3200 .readdir = proc_tid_base_readdir,
3201 .llseek = default_llseek,
3204 static const struct inode_operations proc_tid_base_inode_operations = {
3205 .lookup = proc_tid_base_lookup,
3206 .getattr = pid_getattr,
3207 .setattr = proc_setattr,
3210 static struct dentry *proc_task_instantiate(struct inode *dir,
3211 struct dentry *dentry, struct task_struct *task, const void *ptr)
3213 struct dentry *error = ERR_PTR(-ENOENT);
3214 struct inode *inode;
3215 inode = proc_pid_make_inode(dir->i_sb, task);
3219 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3220 inode->i_op = &proc_tid_base_inode_operations;
3221 inode->i_fop = &proc_tid_base_operations;
3222 inode->i_flags|=S_IMMUTABLE;
3224 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
3225 ARRAY_SIZE(tid_base_stuff));
3227 d_set_d_op(dentry, &pid_dentry_operations);
3229 d_add(dentry, inode);
3230 /* Close the race of the process dying before we return the dentry */
3231 if (pid_revalidate(dentry, NULL))
3237 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3239 struct dentry *result = ERR_PTR(-ENOENT);
3240 struct task_struct *task;
3241 struct task_struct *leader = get_proc_task(dir);
3243 struct pid_namespace *ns;
3248 tid = name_to_int(dentry);
3252 ns = dentry->d_sb->s_fs_info;
3254 task = find_task_by_pid_ns(tid, ns);
3256 get_task_struct(task);
3260 if (!same_thread_group(leader, task))
3263 result = proc_task_instantiate(dir, dentry, task, NULL);
3265 put_task_struct(task);
3267 put_task_struct(leader);
3273 * Find the first tid of a thread group to return to user space.
3275 * Usually this is just the thread group leader, but if the users
3276 * buffer was too small or there was a seek into the middle of the
3277 * directory we have more work todo.
3279 * In the case of a short read we start with find_task_by_pid.
3281 * In the case of a seek we start with the leader and walk nr
3284 static struct task_struct *first_tid(struct task_struct *leader,
3285 int tid, int nr, struct pid_namespace *ns)
3287 struct task_struct *pos;
3290 /* Attempt to start with the pid of a thread */
3291 if (tid && (nr > 0)) {
3292 pos = find_task_by_pid_ns(tid, ns);
3293 if (pos && (pos->group_leader == leader))
3297 /* If nr exceeds the number of threads there is nothing todo */
3299 if (nr && nr >= get_nr_threads(leader))
3302 /* If we haven't found our starting place yet start
3303 * with the leader and walk nr threads forward.
3305 for (pos = leader; nr > 0; --nr) {
3306 pos = next_thread(pos);
3307 if (pos == leader) {
3313 get_task_struct(pos);
3320 * Find the next thread in the thread list.
3321 * Return NULL if there is an error or no next thread.
3323 * The reference to the input task_struct is released.
3325 static struct task_struct *next_tid(struct task_struct *start)
3327 struct task_struct *pos = NULL;
3329 if (pid_alive(start)) {
3330 pos = next_thread(start);
3331 if (thread_group_leader(pos))
3334 get_task_struct(pos);
3337 put_task_struct(start);
3341 static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3342 struct task_struct *task, int tid)
3344 char name[PROC_NUMBUF];
3345 int len = snprintf(name, sizeof(name), "%d", tid);
3346 return proc_fill_cache(filp, dirent, filldir, name, len,
3347 proc_task_instantiate, task, NULL);
3350 /* for the /proc/TGID/task/ directories */
3351 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3353 struct dentry *dentry = filp->f_path.dentry;
3354 struct inode *inode = dentry->d_inode;
3355 struct task_struct *leader = NULL;
3356 struct task_struct *task;
3357 int retval = -ENOENT;
3360 struct pid_namespace *ns;
3362 task = get_proc_task(inode);
3366 if (pid_alive(task)) {
3367 leader = task->group_leader;
3368 get_task_struct(leader);
3371 put_task_struct(task);
3376 switch ((unsigned long)filp->f_pos) {
3379 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
3384 ino = parent_ino(dentry);
3385 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
3391 /* f_version caches the tgid value that the last readdir call couldn't
3392 * return. lseek aka telldir automagically resets f_version to 0.
3394 ns = filp->f_dentry->d_sb->s_fs_info;
3395 tid = (int)filp->f_version;
3396 filp->f_version = 0;
3397 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
3399 task = next_tid(task), filp->f_pos++) {
3400 tid = task_pid_nr_ns(task, ns);
3401 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
3402 /* returning this tgid failed, save it as the first
3403 * pid for the next readir call */
3404 filp->f_version = (u64)tid;
3405 put_task_struct(task);
3410 put_task_struct(leader);
3415 static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3417 struct inode *inode = dentry->d_inode;
3418 struct task_struct *p = get_proc_task(inode);
3419 generic_fillattr(inode, stat);
3422 stat->nlink += get_nr_threads(p);
3429 static const struct inode_operations proc_task_inode_operations = {
3430 .lookup = proc_task_lookup,
3431 .getattr = proc_task_getattr,
3432 .setattr = proc_setattr,
3435 static const struct file_operations proc_task_operations = {
3436 .read = generic_read_dir,
3437 .readdir = proc_task_readdir,
3438 .llseek = default_llseek,