1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1991, 1992 Linus Torvalds
7 * proc base directory handling functions
9 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
10 * Instead of using magical inumbers to determine the kind of object
11 * we allocate and fill in-core inodes upon lookup. They don't even
12 * go into icache. We cache the reference to task_struct upon lookup too.
13 * Eventually it should become a filesystem in its own. We don't use the
14 * rest of procfs anymore.
20 * Bruna Moreira <bruna.moreira@indt.org.br>
21 * Edjard Mota <edjard.mota@indt.org.br>
22 * Ilias Biris <ilias.biris@indt.org.br>
23 * Mauricio Lin <mauricio.lin@indt.org.br>
25 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
27 * A new process specific entry (smaps) included in /proc. It shows the
28 * size of rss for each memory area. The maps entry lacks information
29 * about physical memory size (rss) for each mapped file, i.e.,
30 * rss information for executables and library files.
31 * This additional information is useful for any tools that need to know
32 * about physical memory consumption for a process specific library.
36 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
37 * Pud inclusion in the page table walking.
41 * 10LE Instituto Nokia de Tecnologia - INdT:
42 * A better way to walks through the page table as suggested by Hugh Dickins.
44 * Simo Piiroinen <simo.piiroinen@nokia.com>:
45 * Smaps information related to shared, private, clean and dirty pages.
47 * Paul Mundt <paul.mundt@nokia.com>:
48 * Overall revision about smaps.
51 #include <linux/uaccess.h>
53 #include <linux/errno.h>
54 #include <linux/time.h>
55 #include <linux/proc_fs.h>
56 #include <linux/stat.h>
57 #include <linux/task_io_accounting_ops.h>
58 #include <linux/init.h>
59 #include <linux/capability.h>
60 #include <linux/file.h>
61 #include <linux/fdtable.h>
62 #include <linux/generic-radix-tree.h>
63 #include <linux/string.h>
64 #include <linux/seq_file.h>
65 #include <linux/namei.h>
66 #include <linux/mnt_namespace.h>
68 #include <linux/swap.h>
69 #include <linux/rcupdate.h>
70 #include <linux/kallsyms.h>
71 #include <linux/stacktrace.h>
72 #include <linux/resource.h>
73 #include <linux/module.h>
74 #include <linux/mount.h>
75 #include <linux/security.h>
76 #include <linux/ptrace.h>
77 #include <linux/tracehook.h>
78 #include <linux/printk.h>
79 #include <linux/cache.h>
80 #include <linux/cgroup.h>
81 #include <linux/cpuset.h>
82 #include <linux/audit.h>
83 #include <linux/poll.h>
84 #include <linux/nsproxy.h>
85 #include <linux/oom.h>
86 #include <linux/elf.h>
87 #include <linux/pid_namespace.h>
88 #include <linux/user_namespace.h>
89 #include <linux/fs_struct.h>
90 #include <linux/slab.h>
91 #include <linux/sched/autogroup.h>
92 #include <linux/sched/mm.h>
93 #include <linux/sched/coredump.h>
94 #include <linux/sched/debug.h>
95 #include <linux/sched/stat.h>
96 #include <linux/posix-timers.h>
97 #include <linux/time_namespace.h>
98 #include <linux/resctrl.h>
99 #include <trace/events/oom.h>
100 #include "internal.h"
103 #include "../../lib/kstrtox.h"
106 * Implementing inode permission operations in /proc is almost
107 * certainly an error. Permission checks need to happen during
108 * each system call not at open time. The reason is that most of
109 * what we wish to check for permissions in /proc varies at runtime.
111 * The classic example of a problem is opening file descriptors
112 * in /proc for a task before it execs a suid executable.
115 static u8 nlink_tid __ro_after_init;
116 static u8 nlink_tgid __ro_after_init;
122 const struct inode_operations *iop;
123 const struct file_operations *fop;
127 #define NOD(NAME, MODE, IOP, FOP, OP) { \
129 .len = sizeof(NAME) - 1, \
136 #define DIR(NAME, MODE, iops, fops) \
137 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
138 #define LNK(NAME, get_link) \
139 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
140 &proc_pid_link_inode_operations, NULL, \
141 { .proc_get_link = get_link } )
142 #define REG(NAME, MODE, fops) \
143 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
144 #define ONE(NAME, MODE, show) \
145 NOD(NAME, (S_IFREG|(MODE)), \
146 NULL, &proc_single_file_operations, \
147 { .proc_show = show } )
148 #define ATTR(LSM, NAME, MODE) \
149 NOD(NAME, (S_IFREG|(MODE)), \
150 NULL, &proc_pid_attr_operations, \
154 * Count the number of hardlinks for the pid_entry table, excluding the .
157 static unsigned int __init pid_entry_nlink(const struct pid_entry *entries,
164 for (i = 0; i < n; ++i) {
165 if (S_ISDIR(entries[i].mode))
172 static int get_task_root(struct task_struct *task, struct path *root)
174 int result = -ENOENT;
178 get_fs_root(task->fs, root);
185 static int proc_cwd_link(struct dentry *dentry, struct path *path)
187 struct task_struct *task = get_proc_task(d_inode(dentry));
188 int result = -ENOENT;
193 get_fs_pwd(task->fs, path);
197 put_task_struct(task);
202 static int proc_root_link(struct dentry *dentry, struct path *path)
204 struct task_struct *task = get_proc_task(d_inode(dentry));
205 int result = -ENOENT;
208 result = get_task_root(task, path);
209 put_task_struct(task);
215 * If the user used setproctitle(), we just get the string from
216 * user space at arg_start, and limit it to a maximum of one page.
218 static ssize_t get_mm_proctitle(struct mm_struct *mm, char __user *buf,
219 size_t count, unsigned long pos,
220 unsigned long arg_start)
225 if (pos >= PAGE_SIZE)
228 page = (char *)__get_free_page(GFP_KERNEL);
233 got = access_remote_vm(mm, arg_start, page, PAGE_SIZE, FOLL_ANON);
235 int len = strnlen(page, got);
237 /* Include the NUL character if it was found */
245 len -= copy_to_user(buf, page+pos, len);
251 free_page((unsigned long)page);
255 static ssize_t get_mm_cmdline(struct mm_struct *mm, char __user *buf,
256 size_t count, loff_t *ppos)
258 unsigned long arg_start, arg_end, env_start, env_end;
259 unsigned long pos, len;
262 /* Check if process spawned far enough to have cmdline. */
266 spin_lock(&mm->arg_lock);
267 arg_start = mm->arg_start;
268 arg_end = mm->arg_end;
269 env_start = mm->env_start;
270 env_end = mm->env_end;
271 spin_unlock(&mm->arg_lock);
273 if (arg_start >= arg_end)
277 * We allow setproctitle() to overwrite the argument
278 * strings, and overflow past the original end. But
279 * only when it overflows into the environment area.
281 if (env_start != arg_end || env_end < env_start)
282 env_start = env_end = arg_end;
283 len = env_end - arg_start;
285 /* We're not going to care if "*ppos" has high bits set */
289 if (count > len - pos)
295 * Magical special case: if the argv[] end byte is not
296 * zero, the user has overwritten it with setproctitle(3).
298 * Possible future enhancement: do this only once when
299 * pos is 0, and set a flag in the 'struct file'.
301 if (access_remote_vm(mm, arg_end-1, &c, 1, FOLL_ANON) == 1 && c)
302 return get_mm_proctitle(mm, buf, count, pos, arg_start);
305 * For the non-setproctitle() case we limit things strictly
306 * to the [arg_start, arg_end[ range.
309 if (pos < arg_start || pos >= arg_end)
311 if (count > arg_end - pos)
312 count = arg_end - pos;
314 page = (char *)__get_free_page(GFP_KERNEL);
321 size_t size = min_t(size_t, PAGE_SIZE, count);
323 got = access_remote_vm(mm, pos, page, size, FOLL_ANON);
326 got -= copy_to_user(buf, page, got);
327 if (unlikely(!got)) {
338 free_page((unsigned long)page);
342 static ssize_t get_task_cmdline(struct task_struct *tsk, char __user *buf,
343 size_t count, loff_t *pos)
345 struct mm_struct *mm;
348 mm = get_task_mm(tsk);
352 ret = get_mm_cmdline(mm, buf, count, pos);
357 static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
358 size_t count, loff_t *pos)
360 struct task_struct *tsk;
365 tsk = get_proc_task(file_inode(file));
368 ret = get_task_cmdline(tsk, buf, count, pos);
369 put_task_struct(tsk);
375 static const struct file_operations proc_pid_cmdline_ops = {
376 .read = proc_pid_cmdline_read,
377 .llseek = generic_file_llseek,
380 #ifdef CONFIG_KALLSYMS
382 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
383 * Returns the resolved symbol. If that fails, simply return the address.
385 static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns,
386 struct pid *pid, struct task_struct *task)
389 char symname[KSYM_NAME_LEN];
391 if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
394 wchan = get_wchan(task);
395 if (wchan && !lookup_symbol_name(wchan, symname)) {
396 seq_puts(m, symname);
404 #endif /* CONFIG_KALLSYMS */
406 static int lock_trace(struct task_struct *task)
408 int err = down_read_killable(&task->signal->exec_update_lock);
411 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) {
412 up_read(&task->signal->exec_update_lock);
418 static void unlock_trace(struct task_struct *task)
420 up_read(&task->signal->exec_update_lock);
423 #ifdef CONFIG_STACKTRACE
425 #define MAX_STACK_TRACE_DEPTH 64
427 static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
428 struct pid *pid, struct task_struct *task)
430 unsigned long *entries;
434 * The ability to racily run the kernel stack unwinder on a running task
435 * and then observe the unwinder output is scary; while it is useful for
436 * debugging kernel issues, it can also allow an attacker to leak kernel
438 * Doing this in a manner that is at least safe from races would require
439 * some work to ensure that the remote task can not be scheduled; and
440 * even then, this would still expose the unwinder as local attack
442 * Therefore, this interface is restricted to root.
444 if (!file_ns_capable(m->file, &init_user_ns, CAP_SYS_ADMIN))
447 entries = kmalloc_array(MAX_STACK_TRACE_DEPTH, sizeof(*entries),
452 err = lock_trace(task);
454 unsigned int i, nr_entries;
456 nr_entries = stack_trace_save_tsk(task, entries,
457 MAX_STACK_TRACE_DEPTH, 0);
459 for (i = 0; i < nr_entries; i++) {
460 seq_printf(m, "[<0>] %pB\n", (void *)entries[i]);
471 #ifdef CONFIG_SCHED_INFO
473 * Provides /proc/PID/schedstat
475 static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns,
476 struct pid *pid, struct task_struct *task)
478 if (unlikely(!sched_info_on()))
479 seq_puts(m, "0 0 0\n");
481 seq_printf(m, "%llu %llu %lu\n",
482 (unsigned long long)task->se.sum_exec_runtime,
483 (unsigned long long)task->sched_info.run_delay,
484 task->sched_info.pcount);
490 #ifdef CONFIG_LATENCYTOP
491 static int lstats_show_proc(struct seq_file *m, void *v)
494 struct inode *inode = m->private;
495 struct task_struct *task = get_proc_task(inode);
499 seq_puts(m, "Latency Top version : v0.1\n");
500 for (i = 0; i < LT_SAVECOUNT; i++) {
501 struct latency_record *lr = &task->latency_record[i];
502 if (lr->backtrace[0]) {
504 seq_printf(m, "%i %li %li",
505 lr->count, lr->time, lr->max);
506 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
507 unsigned long bt = lr->backtrace[q];
511 seq_printf(m, " %ps", (void *)bt);
517 put_task_struct(task);
521 static int lstats_open(struct inode *inode, struct file *file)
523 return single_open(file, lstats_show_proc, inode);
526 static ssize_t lstats_write(struct file *file, const char __user *buf,
527 size_t count, loff_t *offs)
529 struct task_struct *task = get_proc_task(file_inode(file));
533 clear_tsk_latency_tracing(task);
534 put_task_struct(task);
539 static const struct file_operations proc_lstats_operations = {
542 .write = lstats_write,
544 .release = single_release,
549 static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
550 struct pid *pid, struct task_struct *task)
552 unsigned long totalpages = totalram_pages() + total_swap_pages;
553 unsigned long points = 0;
556 badness = oom_badness(task, totalpages);
558 * Special case OOM_SCORE_ADJ_MIN for all others scale the
559 * badness value into [0, 2000] range which we have been
560 * exporting for a long time so userspace might depend on it.
562 if (badness != LONG_MIN)
563 points = (1000 + badness * 1000 / (long)totalpages) * 2 / 3;
565 seq_printf(m, "%lu\n", points);
575 static const struct limit_names lnames[RLIM_NLIMITS] = {
576 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
577 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
578 [RLIMIT_DATA] = {"Max data size", "bytes"},
579 [RLIMIT_STACK] = {"Max stack size", "bytes"},
580 [RLIMIT_CORE] = {"Max core file size", "bytes"},
581 [RLIMIT_RSS] = {"Max resident set", "bytes"},
582 [RLIMIT_NPROC] = {"Max processes", "processes"},
583 [RLIMIT_NOFILE] = {"Max open files", "files"},
584 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
585 [RLIMIT_AS] = {"Max address space", "bytes"},
586 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
587 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
588 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
589 [RLIMIT_NICE] = {"Max nice priority", NULL},
590 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
591 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
594 /* Display limits for a process */
595 static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
596 struct pid *pid, struct task_struct *task)
601 struct rlimit rlim[RLIM_NLIMITS];
603 if (!lock_task_sighand(task, &flags))
605 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
606 unlock_task_sighand(task, &flags);
609 * print the file header
616 for (i = 0; i < RLIM_NLIMITS; i++) {
617 if (rlim[i].rlim_cur == RLIM_INFINITY)
618 seq_printf(m, "%-25s %-20s ",
619 lnames[i].name, "unlimited");
621 seq_printf(m, "%-25s %-20lu ",
622 lnames[i].name, rlim[i].rlim_cur);
624 if (rlim[i].rlim_max == RLIM_INFINITY)
625 seq_printf(m, "%-20s ", "unlimited");
627 seq_printf(m, "%-20lu ", rlim[i].rlim_max);
630 seq_printf(m, "%-10s\n", lnames[i].unit);
638 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
639 static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
640 struct pid *pid, struct task_struct *task)
642 struct syscall_info info;
643 u64 *args = &info.data.args[0];
646 res = lock_trace(task);
650 if (task_current_syscall(task, &info))
651 seq_puts(m, "running\n");
652 else if (info.data.nr < 0)
653 seq_printf(m, "%d 0x%llx 0x%llx\n",
654 info.data.nr, info.sp, info.data.instruction_pointer);
657 "%d 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx\n",
659 args[0], args[1], args[2], args[3], args[4], args[5],
660 info.sp, info.data.instruction_pointer);
665 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
667 /************************************************************************/
668 /* Here the fs part begins */
669 /************************************************************************/
671 /* permission checks */
672 static int proc_fd_access_allowed(struct inode *inode)
674 struct task_struct *task;
676 /* Allow access to a task's file descriptors if it is us or we
677 * may use ptrace attach to the process and find out that
680 task = get_proc_task(inode);
682 allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
683 put_task_struct(task);
688 int proc_setattr(struct dentry *dentry, struct iattr *attr)
691 struct inode *inode = d_inode(dentry);
693 if (attr->ia_valid & ATTR_MODE)
696 error = setattr_prepare(dentry, attr);
700 setattr_copy(inode, attr);
701 mark_inode_dirty(inode);
706 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
707 * or euid/egid (for hide_pid_min=2)?
709 static bool has_pid_permissions(struct proc_fs_info *fs_info,
710 struct task_struct *task,
711 enum proc_hidepid hide_pid_min)
714 * If 'hidpid' mount option is set force a ptrace check,
715 * we indicate that we are using a filesystem syscall
716 * by passing PTRACE_MODE_READ_FSCREDS
718 if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE)
719 return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
721 if (fs_info->hide_pid < hide_pid_min)
723 if (in_group_p(fs_info->pid_gid))
725 return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
729 static int proc_pid_permission(struct inode *inode, int mask)
731 struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
732 struct task_struct *task;
735 task = get_proc_task(inode);
738 has_perms = has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS);
739 put_task_struct(task);
742 if (fs_info->hide_pid == HIDEPID_INVISIBLE) {
744 * Let's make getdents(), stat(), and open()
745 * consistent with each other. If a process
746 * may not stat() a file, it shouldn't be seen
754 return generic_permission(inode, mask);
759 static const struct inode_operations proc_def_inode_operations = {
760 .setattr = proc_setattr,
763 static int proc_single_show(struct seq_file *m, void *v)
765 struct inode *inode = m->private;
766 struct pid_namespace *ns = proc_pid_ns(inode->i_sb);
767 struct pid *pid = proc_pid(inode);
768 struct task_struct *task;
771 task = get_pid_task(pid, PIDTYPE_PID);
775 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
777 put_task_struct(task);
781 static int proc_single_open(struct inode *inode, struct file *filp)
783 return single_open(filp, proc_single_show, inode);
786 static const struct file_operations proc_single_file_operations = {
787 .open = proc_single_open,
790 .release = single_release,
794 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode)
796 struct task_struct *task = get_proc_task(inode);
797 struct mm_struct *mm = ERR_PTR(-ESRCH);
800 mm = mm_access(task, mode | PTRACE_MODE_FSCREDS);
801 put_task_struct(task);
803 if (!IS_ERR_OR_NULL(mm)) {
804 /* ensure this mm_struct can't be freed */
806 /* but do not pin its memory */
814 static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
816 struct mm_struct *mm = proc_mem_open(inode, mode);
821 file->private_data = mm;
825 static int mem_open(struct inode *inode, struct file *file)
827 int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH);
829 /* OK to pass negative loff_t, we can catch out-of-range */
830 file->f_mode |= FMODE_UNSIGNED_OFFSET;
835 static ssize_t mem_rw(struct file *file, char __user *buf,
836 size_t count, loff_t *ppos, int write)
838 struct mm_struct *mm = file->private_data;
839 unsigned long addr = *ppos;
847 page = (char *)__get_free_page(GFP_KERNEL);
852 if (!mmget_not_zero(mm))
855 flags = FOLL_FORCE | (write ? FOLL_WRITE : 0);
858 size_t this_len = min_t(size_t, count, PAGE_SIZE);
860 if (write && copy_from_user(page, buf, this_len)) {
865 this_len = access_remote_vm(mm, addr, page, this_len, flags);
872 if (!write && copy_to_user(buf, page, this_len)) {
886 free_page((unsigned long) page);
890 static ssize_t mem_read(struct file *file, char __user *buf,
891 size_t count, loff_t *ppos)
893 return mem_rw(file, buf, count, ppos, 0);
896 static ssize_t mem_write(struct file *file, const char __user *buf,
897 size_t count, loff_t *ppos)
899 return mem_rw(file, (char __user*)buf, count, ppos, 1);
902 loff_t mem_lseek(struct file *file, loff_t offset, int orig)
906 file->f_pos = offset;
909 file->f_pos += offset;
914 force_successful_syscall_return();
918 static int mem_release(struct inode *inode, struct file *file)
920 struct mm_struct *mm = file->private_data;
926 static const struct file_operations proc_mem_operations = {
931 .release = mem_release,
934 static int environ_open(struct inode *inode, struct file *file)
936 return __mem_open(inode, file, PTRACE_MODE_READ);
939 static ssize_t environ_read(struct file *file, char __user *buf,
940 size_t count, loff_t *ppos)
943 unsigned long src = *ppos;
945 struct mm_struct *mm = file->private_data;
946 unsigned long env_start, env_end;
948 /* Ensure the process spawned far enough to have an environment. */
949 if (!mm || !mm->env_end)
952 page = (char *)__get_free_page(GFP_KERNEL);
957 if (!mmget_not_zero(mm))
960 spin_lock(&mm->arg_lock);
961 env_start = mm->env_start;
962 env_end = mm->env_end;
963 spin_unlock(&mm->arg_lock);
966 size_t this_len, max_len;
969 if (src >= (env_end - env_start))
972 this_len = env_end - (env_start + src);
974 max_len = min_t(size_t, PAGE_SIZE, count);
975 this_len = min(max_len, this_len);
977 retval = access_remote_vm(mm, (env_start + src), page, this_len, FOLL_ANON);
984 if (copy_to_user(buf, page, retval)) {
998 free_page((unsigned long) page);
1002 static const struct file_operations proc_environ_operations = {
1003 .open = environ_open,
1004 .read = environ_read,
1005 .llseek = generic_file_llseek,
1006 .release = mem_release,
1009 static int auxv_open(struct inode *inode, struct file *file)
1011 return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS);
1014 static ssize_t auxv_read(struct file *file, char __user *buf,
1015 size_t count, loff_t *ppos)
1017 struct mm_struct *mm = file->private_data;
1018 unsigned int nwords = 0;
1024 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
1025 return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv,
1026 nwords * sizeof(mm->saved_auxv[0]));
1029 static const struct file_operations proc_auxv_operations = {
1032 .llseek = generic_file_llseek,
1033 .release = mem_release,
1036 static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count,
1039 struct task_struct *task = get_proc_task(file_inode(file));
1040 char buffer[PROC_NUMBUF];
1041 int oom_adj = OOM_ADJUST_MIN;
1046 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX)
1047 oom_adj = OOM_ADJUST_MAX;
1049 oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) /
1051 put_task_struct(task);
1052 if (oom_adj > OOM_ADJUST_MAX)
1053 oom_adj = OOM_ADJUST_MAX;
1054 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj);
1055 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1058 static int __set_oom_adj(struct file *file, int oom_adj, bool legacy)
1060 struct mm_struct *mm = NULL;
1061 struct task_struct *task;
1064 task = get_proc_task(file_inode(file));
1068 mutex_lock(&oom_adj_mutex);
1070 if (oom_adj < task->signal->oom_score_adj &&
1071 !capable(CAP_SYS_RESOURCE)) {
1076 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1077 * /proc/pid/oom_score_adj instead.
1079 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1080 current->comm, task_pid_nr(current), task_pid_nr(task),
1083 if ((short)oom_adj < task->signal->oom_score_adj_min &&
1084 !capable(CAP_SYS_RESOURCE)) {
1091 * Make sure we will check other processes sharing the mm if this is
1092 * not vfrok which wants its own oom_score_adj.
1093 * pin the mm so it doesn't go away and get reused after task_unlock
1095 if (!task->vfork_done) {
1096 struct task_struct *p = find_lock_task_mm(task);
1099 if (test_bit(MMF_MULTIPROCESS, &p->mm->flags)) {
1107 task->signal->oom_score_adj = oom_adj;
1108 if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE))
1109 task->signal->oom_score_adj_min = (short)oom_adj;
1110 trace_oom_score_adj_update(task);
1113 struct task_struct *p;
1116 for_each_process(p) {
1117 if (same_thread_group(task, p))
1120 /* do not touch kernel threads or the global init */
1121 if (p->flags & PF_KTHREAD || is_global_init(p))
1125 if (!p->vfork_done && process_shares_mm(p, mm)) {
1126 p->signal->oom_score_adj = oom_adj;
1127 if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE))
1128 p->signal->oom_score_adj_min = (short)oom_adj;
1136 mutex_unlock(&oom_adj_mutex);
1137 put_task_struct(task);
1142 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1143 * kernels. The effective policy is defined by oom_score_adj, which has a
1144 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1145 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1146 * Processes that become oom disabled via oom_adj will still be oom disabled
1147 * with this implementation.
1149 * oom_adj cannot be removed since existing userspace binaries use it.
1151 static ssize_t oom_adj_write(struct file *file, const char __user *buf,
1152 size_t count, loff_t *ppos)
1154 char buffer[PROC_NUMBUF];
1158 memset(buffer, 0, sizeof(buffer));
1159 if (count > sizeof(buffer) - 1)
1160 count = sizeof(buffer) - 1;
1161 if (copy_from_user(buffer, buf, count)) {
1166 err = kstrtoint(strstrip(buffer), 0, &oom_adj);
1169 if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) &&
1170 oom_adj != OOM_DISABLE) {
1176 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1177 * value is always attainable.
1179 if (oom_adj == OOM_ADJUST_MAX)
1180 oom_adj = OOM_SCORE_ADJ_MAX;
1182 oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;
1184 err = __set_oom_adj(file, oom_adj, true);
1186 return err < 0 ? err : count;
1189 static const struct file_operations proc_oom_adj_operations = {
1190 .read = oom_adj_read,
1191 .write = oom_adj_write,
1192 .llseek = generic_file_llseek,
1195 static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1196 size_t count, loff_t *ppos)
1198 struct task_struct *task = get_proc_task(file_inode(file));
1199 char buffer[PROC_NUMBUF];
1200 short oom_score_adj = OOM_SCORE_ADJ_MIN;
1205 oom_score_adj = task->signal->oom_score_adj;
1206 put_task_struct(task);
1207 len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj);
1208 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1211 static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1212 size_t count, loff_t *ppos)
1214 char buffer[PROC_NUMBUF];
1218 memset(buffer, 0, sizeof(buffer));
1219 if (count > sizeof(buffer) - 1)
1220 count = sizeof(buffer) - 1;
1221 if (copy_from_user(buffer, buf, count)) {
1226 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
1229 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
1230 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1235 err = __set_oom_adj(file, oom_score_adj, false);
1237 return err < 0 ? err : count;
1240 static const struct file_operations proc_oom_score_adj_operations = {
1241 .read = oom_score_adj_read,
1242 .write = oom_score_adj_write,
1243 .llseek = default_llseek,
1247 #define TMPBUFLEN 11
1248 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1249 size_t count, loff_t *ppos)
1251 struct inode * inode = file_inode(file);
1252 struct task_struct *task = get_proc_task(inode);
1254 char tmpbuf[TMPBUFLEN];
1258 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1259 from_kuid(file->f_cred->user_ns,
1260 audit_get_loginuid(task)));
1261 put_task_struct(task);
1262 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1265 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1266 size_t count, loff_t *ppos)
1268 struct inode * inode = file_inode(file);
1273 /* Don't let kthreads write their own loginuid */
1274 if (current->flags & PF_KTHREAD)
1278 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1285 /* No partial writes. */
1289 rv = kstrtou32_from_user(buf, count, 10, &loginuid);
1293 /* is userspace tring to explicitly UNSET the loginuid? */
1294 if (loginuid == AUDIT_UID_UNSET) {
1295 kloginuid = INVALID_UID;
1297 kloginuid = make_kuid(file->f_cred->user_ns, loginuid);
1298 if (!uid_valid(kloginuid))
1302 rv = audit_set_loginuid(kloginuid);
1308 static const struct file_operations proc_loginuid_operations = {
1309 .read = proc_loginuid_read,
1310 .write = proc_loginuid_write,
1311 .llseek = generic_file_llseek,
1314 static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1315 size_t count, loff_t *ppos)
1317 struct inode * inode = file_inode(file);
1318 struct task_struct *task = get_proc_task(inode);
1320 char tmpbuf[TMPBUFLEN];
1324 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1325 audit_get_sessionid(task));
1326 put_task_struct(task);
1327 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1330 static const struct file_operations proc_sessionid_operations = {
1331 .read = proc_sessionid_read,
1332 .llseek = generic_file_llseek,
1336 #ifdef CONFIG_FAULT_INJECTION
1337 static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1338 size_t count, loff_t *ppos)
1340 struct task_struct *task = get_proc_task(file_inode(file));
1341 char buffer[PROC_NUMBUF];
1347 make_it_fail = task->make_it_fail;
1348 put_task_struct(task);
1350 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
1352 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1355 static ssize_t proc_fault_inject_write(struct file * file,
1356 const char __user * buf, size_t count, loff_t *ppos)
1358 struct task_struct *task;
1359 char buffer[PROC_NUMBUF];
1363 if (!capable(CAP_SYS_RESOURCE))
1365 memset(buffer, 0, sizeof(buffer));
1366 if (count > sizeof(buffer) - 1)
1367 count = sizeof(buffer) - 1;
1368 if (copy_from_user(buffer, buf, count))
1370 rv = kstrtoint(strstrip(buffer), 0, &make_it_fail);
1373 if (make_it_fail < 0 || make_it_fail > 1)
1376 task = get_proc_task(file_inode(file));
1379 task->make_it_fail = make_it_fail;
1380 put_task_struct(task);
1385 static const struct file_operations proc_fault_inject_operations = {
1386 .read = proc_fault_inject_read,
1387 .write = proc_fault_inject_write,
1388 .llseek = generic_file_llseek,
1391 static ssize_t proc_fail_nth_write(struct file *file, const char __user *buf,
1392 size_t count, loff_t *ppos)
1394 struct task_struct *task;
1398 err = kstrtouint_from_user(buf, count, 0, &n);
1402 task = get_proc_task(file_inode(file));
1406 put_task_struct(task);
1411 static ssize_t proc_fail_nth_read(struct file *file, char __user *buf,
1412 size_t count, loff_t *ppos)
1414 struct task_struct *task;
1415 char numbuf[PROC_NUMBUF];
1418 task = get_proc_task(file_inode(file));
1421 len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth);
1422 put_task_struct(task);
1423 return simple_read_from_buffer(buf, count, ppos, numbuf, len);
1426 static const struct file_operations proc_fail_nth_operations = {
1427 .read = proc_fail_nth_read,
1428 .write = proc_fail_nth_write,
1433 #ifdef CONFIG_SCHED_DEBUG
1435 * Print out various scheduling related per-task fields:
1437 static int sched_show(struct seq_file *m, void *v)
1439 struct inode *inode = m->private;
1440 struct pid_namespace *ns = proc_pid_ns(inode->i_sb);
1441 struct task_struct *p;
1443 p = get_proc_task(inode);
1446 proc_sched_show_task(p, ns, m);
1454 sched_write(struct file *file, const char __user *buf,
1455 size_t count, loff_t *offset)
1457 struct inode *inode = file_inode(file);
1458 struct task_struct *p;
1460 p = get_proc_task(inode);
1463 proc_sched_set_task(p);
1470 static int sched_open(struct inode *inode, struct file *filp)
1472 return single_open(filp, sched_show, inode);
1475 static const struct file_operations proc_pid_sched_operations = {
1478 .write = sched_write,
1479 .llseek = seq_lseek,
1480 .release = single_release,
1485 #ifdef CONFIG_SCHED_AUTOGROUP
1487 * Print out autogroup related information:
1489 static int sched_autogroup_show(struct seq_file *m, void *v)
1491 struct inode *inode = m->private;
1492 struct task_struct *p;
1494 p = get_proc_task(inode);
1497 proc_sched_autogroup_show_task(p, m);
1505 sched_autogroup_write(struct file *file, const char __user *buf,
1506 size_t count, loff_t *offset)
1508 struct inode *inode = file_inode(file);
1509 struct task_struct *p;
1510 char buffer[PROC_NUMBUF];
1514 memset(buffer, 0, sizeof(buffer));
1515 if (count > sizeof(buffer) - 1)
1516 count = sizeof(buffer) - 1;
1517 if (copy_from_user(buffer, buf, count))
1520 err = kstrtoint(strstrip(buffer), 0, &nice);
1524 p = get_proc_task(inode);
1528 err = proc_sched_autogroup_set_nice(p, nice);
1537 static int sched_autogroup_open(struct inode *inode, struct file *filp)
1541 ret = single_open(filp, sched_autogroup_show, NULL);
1543 struct seq_file *m = filp->private_data;
1550 static const struct file_operations proc_pid_sched_autogroup_operations = {
1551 .open = sched_autogroup_open,
1553 .write = sched_autogroup_write,
1554 .llseek = seq_lseek,
1555 .release = single_release,
1558 #endif /* CONFIG_SCHED_AUTOGROUP */
1560 #ifdef CONFIG_TIME_NS
1561 static int timens_offsets_show(struct seq_file *m, void *v)
1563 struct task_struct *p;
1565 p = get_proc_task(file_inode(m->file));
1568 proc_timens_show_offsets(p, m);
1575 static ssize_t timens_offsets_write(struct file *file, const char __user *buf,
1576 size_t count, loff_t *ppos)
1578 struct inode *inode = file_inode(file);
1579 struct proc_timens_offset offsets[2];
1580 char *kbuf = NULL, *pos, *next_line;
1581 struct task_struct *p;
1584 /* Only allow < page size writes at the beginning of the file */
1585 if ((*ppos != 0) || (count >= PAGE_SIZE))
1588 /* Slurp in the user data */
1589 kbuf = memdup_user_nul(buf, count);
1591 return PTR_ERR(kbuf);
1593 /* Parse the user data */
1596 for (pos = kbuf; pos; pos = next_line) {
1597 struct proc_timens_offset *off = &offsets[noffsets];
1601 /* Find the end of line and ensure we don't look past it */
1602 next_line = strchr(pos, '\n');
1606 if (*next_line == '\0')
1610 err = sscanf(pos, "%9s %lld %lu", clock,
1611 &off->val.tv_sec, &off->val.tv_nsec);
1612 if (err != 3 || off->val.tv_nsec >= NSEC_PER_SEC)
1615 clock[sizeof(clock) - 1] = 0;
1616 if (strcmp(clock, "monotonic") == 0 ||
1617 strcmp(clock, __stringify(CLOCK_MONOTONIC)) == 0)
1618 off->clockid = CLOCK_MONOTONIC;
1619 else if (strcmp(clock, "boottime") == 0 ||
1620 strcmp(clock, __stringify(CLOCK_BOOTTIME)) == 0)
1621 off->clockid = CLOCK_BOOTTIME;
1626 if (noffsets == ARRAY_SIZE(offsets)) {
1628 count = next_line - kbuf;
1634 p = get_proc_task(inode);
1637 ret = proc_timens_set_offset(file, p, offsets, noffsets);
1648 static int timens_offsets_open(struct inode *inode, struct file *filp)
1650 return single_open(filp, timens_offsets_show, inode);
1653 static const struct file_operations proc_timens_offsets_operations = {
1654 .open = timens_offsets_open,
1656 .write = timens_offsets_write,
1657 .llseek = seq_lseek,
1658 .release = single_release,
1660 #endif /* CONFIG_TIME_NS */
1662 static ssize_t comm_write(struct file *file, const char __user *buf,
1663 size_t count, loff_t *offset)
1665 struct inode *inode = file_inode(file);
1666 struct task_struct *p;
1667 char buffer[TASK_COMM_LEN];
1668 const size_t maxlen = sizeof(buffer) - 1;
1670 memset(buffer, 0, sizeof(buffer));
1671 if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count))
1674 p = get_proc_task(inode);
1678 if (same_thread_group(current, p))
1679 set_task_comm(p, buffer);
1688 static int comm_show(struct seq_file *m, void *v)
1690 struct inode *inode = m->private;
1691 struct task_struct *p;
1693 p = get_proc_task(inode);
1697 proc_task_name(m, p, false);
1705 static int comm_open(struct inode *inode, struct file *filp)
1707 return single_open(filp, comm_show, inode);
1710 static const struct file_operations proc_pid_set_comm_operations = {
1713 .write = comm_write,
1714 .llseek = seq_lseek,
1715 .release = single_release,
1718 static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
1720 struct task_struct *task;
1721 struct file *exe_file;
1723 task = get_proc_task(d_inode(dentry));
1726 exe_file = get_task_exe_file(task);
1727 put_task_struct(task);
1729 *exe_path = exe_file->f_path;
1730 path_get(&exe_file->f_path);
1737 static const char *proc_pid_get_link(struct dentry *dentry,
1738 struct inode *inode,
1739 struct delayed_call *done)
1742 int error = -EACCES;
1745 return ERR_PTR(-ECHILD);
1747 /* Are we allowed to snoop on the tasks file descriptors? */
1748 if (!proc_fd_access_allowed(inode))
1751 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1755 error = nd_jump_link(&path);
1757 return ERR_PTR(error);
1760 static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1762 char *tmp = (char *)__get_free_page(GFP_KERNEL);
1769 pathname = d_path(path, tmp, PAGE_SIZE);
1770 len = PTR_ERR(pathname);
1771 if (IS_ERR(pathname))
1773 len = tmp + PAGE_SIZE - 1 - pathname;
1777 if (copy_to_user(buffer, pathname, len))
1780 free_page((unsigned long)tmp);
1784 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1786 int error = -EACCES;
1787 struct inode *inode = d_inode(dentry);
1790 /* Are we allowed to snoop on the tasks file descriptors? */
1791 if (!proc_fd_access_allowed(inode))
1794 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1798 error = do_proc_readlink(&path, buffer, buflen);
1804 const struct inode_operations proc_pid_link_inode_operations = {
1805 .readlink = proc_pid_readlink,
1806 .get_link = proc_pid_get_link,
1807 .setattr = proc_setattr,
1811 /* building an inode */
1813 void task_dump_owner(struct task_struct *task, umode_t mode,
1814 kuid_t *ruid, kgid_t *rgid)
1816 /* Depending on the state of dumpable compute who should own a
1817 * proc file for a task.
1819 const struct cred *cred;
1823 if (unlikely(task->flags & PF_KTHREAD)) {
1824 *ruid = GLOBAL_ROOT_UID;
1825 *rgid = GLOBAL_ROOT_GID;
1829 /* Default to the tasks effective ownership */
1831 cred = __task_cred(task);
1837 * Before the /proc/pid/status file was created the only way to read
1838 * the effective uid of a /process was to stat /proc/pid. Reading
1839 * /proc/pid/status is slow enough that procps and other packages
1840 * kept stating /proc/pid. To keep the rules in /proc simple I have
1841 * made this apply to all per process world readable and executable
1844 if (mode != (S_IFDIR|S_IRUGO|S_IXUGO)) {
1845 struct mm_struct *mm;
1848 /* Make non-dumpable tasks owned by some root */
1850 if (get_dumpable(mm) != SUID_DUMP_USER) {
1851 struct user_namespace *user_ns = mm->user_ns;
1853 uid = make_kuid(user_ns, 0);
1854 if (!uid_valid(uid))
1855 uid = GLOBAL_ROOT_UID;
1857 gid = make_kgid(user_ns, 0);
1858 if (!gid_valid(gid))
1859 gid = GLOBAL_ROOT_GID;
1862 uid = GLOBAL_ROOT_UID;
1863 gid = GLOBAL_ROOT_GID;
1871 void proc_pid_evict_inode(struct proc_inode *ei)
1873 struct pid *pid = ei->pid;
1875 if (S_ISDIR(ei->vfs_inode.i_mode)) {
1876 spin_lock(&pid->lock);
1877 hlist_del_init_rcu(&ei->sibling_inodes);
1878 spin_unlock(&pid->lock);
1884 struct inode *proc_pid_make_inode(struct super_block *sb,
1885 struct task_struct *task, umode_t mode)
1887 struct inode * inode;
1888 struct proc_inode *ei;
1891 /* We need a new inode */
1893 inode = new_inode(sb);
1899 inode->i_mode = mode;
1900 inode->i_ino = get_next_ino();
1901 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
1902 inode->i_op = &proc_def_inode_operations;
1905 * grab the reference to task.
1907 pid = get_task_pid(task, PIDTYPE_PID);
1911 /* Let the pid remember us for quick removal */
1914 task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);
1915 security_task_to_inode(task, inode);
1926 * Generating an inode and adding it into @pid->inodes, so that task will
1927 * invalidate inode's dentry before being released.
1929 * This helper is used for creating dir-type entries under '/proc' and
1930 * '/proc/<tgid>/task'. Other entries(eg. fd, stat) under '/proc/<tgid>'
1931 * can be released by invalidating '/proc/<tgid>' dentry.
1932 * In theory, dentries under '/proc/<tgid>/task' can also be released by
1933 * invalidating '/proc/<tgid>' dentry, we reserve it to handle single
1934 * thread exiting situation: Any one of threads should invalidate its
1935 * '/proc/<tgid>/task/<pid>' dentry before released.
1937 static struct inode *proc_pid_make_base_inode(struct super_block *sb,
1938 struct task_struct *task, umode_t mode)
1940 struct inode *inode;
1941 struct proc_inode *ei;
1944 inode = proc_pid_make_inode(sb, task, mode);
1948 /* Let proc_flush_pid find this directory inode */
1951 spin_lock(&pid->lock);
1952 hlist_add_head_rcu(&ei->sibling_inodes, &pid->inodes);
1953 spin_unlock(&pid->lock);
1958 int pid_getattr(const struct path *path, struct kstat *stat,
1959 u32 request_mask, unsigned int query_flags)
1961 struct inode *inode = d_inode(path->dentry);
1962 struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
1963 struct task_struct *task;
1965 generic_fillattr(inode, stat);
1967 stat->uid = GLOBAL_ROOT_UID;
1968 stat->gid = GLOBAL_ROOT_GID;
1970 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1972 if (!has_pid_permissions(fs_info, task, HIDEPID_INVISIBLE)) {
1975 * This doesn't prevent learning whether PID exists,
1976 * it only makes getattr() consistent with readdir().
1980 task_dump_owner(task, inode->i_mode, &stat->uid, &stat->gid);
1989 * Set <pid>/... inode ownership (can change due to setuid(), etc.)
1991 void pid_update_inode(struct task_struct *task, struct inode *inode)
1993 task_dump_owner(task, inode->i_mode, &inode->i_uid, &inode->i_gid);
1995 inode->i_mode &= ~(S_ISUID | S_ISGID);
1996 security_task_to_inode(task, inode);
2000 * Rewrite the inode's ownerships here because the owning task may have
2001 * performed a setuid(), etc.
2004 static int pid_revalidate(struct dentry *dentry, unsigned int flags)
2006 struct inode *inode;
2007 struct task_struct *task;
2009 if (flags & LOOKUP_RCU)
2012 inode = d_inode(dentry);
2013 task = get_proc_task(inode);
2016 pid_update_inode(task, inode);
2017 put_task_struct(task);
2023 static inline bool proc_inode_is_dead(struct inode *inode)
2025 return !proc_pid(inode)->tasks[PIDTYPE_PID].first;
2028 int pid_delete_dentry(const struct dentry *dentry)
2030 /* Is the task we represent dead?
2031 * If so, then don't put the dentry on the lru list,
2032 * kill it immediately.
2034 return proc_inode_is_dead(d_inode(dentry));
2037 const struct dentry_operations pid_dentry_operations =
2039 .d_revalidate = pid_revalidate,
2040 .d_delete = pid_delete_dentry,
2046 * Fill a directory entry.
2048 * If possible create the dcache entry and derive our inode number and
2049 * file type from dcache entry.
2051 * Since all of the proc inode numbers are dynamically generated, the inode
2052 * numbers do not exist until the inode is cache. This means creating the
2053 * the dcache entry in readdir is necessary to keep the inode numbers
2054 * reported by readdir in sync with the inode numbers reported
2057 bool proc_fill_cache(struct file *file, struct dir_context *ctx,
2058 const char *name, unsigned int len,
2059 instantiate_t instantiate, struct task_struct *task, const void *ptr)
2061 struct dentry *child, *dir = file->f_path.dentry;
2062 struct qstr qname = QSTR_INIT(name, len);
2063 struct inode *inode;
2064 unsigned type = DT_UNKNOWN;
2067 child = d_hash_and_lookup(dir, &qname);
2069 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
2070 child = d_alloc_parallel(dir, &qname, &wq);
2072 goto end_instantiate;
2073 if (d_in_lookup(child)) {
2075 res = instantiate(child, task, ptr);
2076 d_lookup_done(child);
2077 if (unlikely(res)) {
2081 goto end_instantiate;
2085 inode = d_inode(child);
2087 type = inode->i_mode >> 12;
2090 return dir_emit(ctx, name, len, ino, type);
2094 * dname_to_vma_addr - maps a dentry name into two unsigned longs
2095 * which represent vma start and end addresses.
2097 static int dname_to_vma_addr(struct dentry *dentry,
2098 unsigned long *start, unsigned long *end)
2100 const char *str = dentry->d_name.name;
2101 unsigned long long sval, eval;
2104 if (str[0] == '0' && str[1] != '-')
2106 len = _parse_integer(str, 16, &sval);
2107 if (len & KSTRTOX_OVERFLOW)
2109 if (sval != (unsigned long)sval)
2117 if (str[0] == '0' && str[1])
2119 len = _parse_integer(str, 16, &eval);
2120 if (len & KSTRTOX_OVERFLOW)
2122 if (eval != (unsigned long)eval)
2135 static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags)
2137 unsigned long vm_start, vm_end;
2138 bool exact_vma_exists = false;
2139 struct mm_struct *mm = NULL;
2140 struct task_struct *task;
2141 struct inode *inode;
2144 if (flags & LOOKUP_RCU)
2147 inode = d_inode(dentry);
2148 task = get_proc_task(inode);
2152 mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);
2153 if (IS_ERR_OR_NULL(mm))
2156 if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
2157 status = mmap_read_lock_killable(mm);
2159 exact_vma_exists = !!find_exact_vma(mm, vm_start,
2161 mmap_read_unlock(mm);
2167 if (exact_vma_exists) {
2168 task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);
2170 security_task_to_inode(task, inode);
2175 put_task_struct(task);
2181 static const struct dentry_operations tid_map_files_dentry_operations = {
2182 .d_revalidate = map_files_d_revalidate,
2183 .d_delete = pid_delete_dentry,
2186 static int map_files_get_link(struct dentry *dentry, struct path *path)
2188 unsigned long vm_start, vm_end;
2189 struct vm_area_struct *vma;
2190 struct task_struct *task;
2191 struct mm_struct *mm;
2195 task = get_proc_task(d_inode(dentry));
2199 mm = get_task_mm(task);
2200 put_task_struct(task);
2204 rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
2208 rc = mmap_read_lock_killable(mm);
2213 vma = find_exact_vma(mm, vm_start, vm_end);
2214 if (vma && vma->vm_file) {
2215 *path = vma->vm_file->f_path;
2219 mmap_read_unlock(mm);
2227 struct map_files_info {
2228 unsigned long start;
2234 * Only allow CAP_SYS_ADMIN and CAP_CHECKPOINT_RESTORE to follow the links, due
2235 * to concerns about how the symlinks may be used to bypass permissions on
2236 * ancestor directories in the path to the file in question.
2239 proc_map_files_get_link(struct dentry *dentry,
2240 struct inode *inode,
2241 struct delayed_call *done)
2243 if (!checkpoint_restore_ns_capable(&init_user_ns))
2244 return ERR_PTR(-EPERM);
2246 return proc_pid_get_link(dentry, inode, done);
2250 * Identical to proc_pid_link_inode_operations except for get_link()
2252 static const struct inode_operations proc_map_files_link_inode_operations = {
2253 .readlink = proc_pid_readlink,
2254 .get_link = proc_map_files_get_link,
2255 .setattr = proc_setattr,
2258 static struct dentry *
2259 proc_map_files_instantiate(struct dentry *dentry,
2260 struct task_struct *task, const void *ptr)
2262 fmode_t mode = (fmode_t)(unsigned long)ptr;
2263 struct proc_inode *ei;
2264 struct inode *inode;
2266 inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK |
2267 ((mode & FMODE_READ ) ? S_IRUSR : 0) |
2268 ((mode & FMODE_WRITE) ? S_IWUSR : 0));
2270 return ERR_PTR(-ENOENT);
2273 ei->op.proc_get_link = map_files_get_link;
2275 inode->i_op = &proc_map_files_link_inode_operations;
2278 d_set_d_op(dentry, &tid_map_files_dentry_operations);
2279 return d_splice_alias(inode, dentry);
2282 static struct dentry *proc_map_files_lookup(struct inode *dir,
2283 struct dentry *dentry, unsigned int flags)
2285 unsigned long vm_start, vm_end;
2286 struct vm_area_struct *vma;
2287 struct task_struct *task;
2288 struct dentry *result;
2289 struct mm_struct *mm;
2291 result = ERR_PTR(-ENOENT);
2292 task = get_proc_task(dir);
2296 result = ERR_PTR(-EACCES);
2297 if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
2300 result = ERR_PTR(-ENOENT);
2301 if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
2304 mm = get_task_mm(task);
2308 result = ERR_PTR(-EINTR);
2309 if (mmap_read_lock_killable(mm))
2312 result = ERR_PTR(-ENOENT);
2313 vma = find_exact_vma(mm, vm_start, vm_end);
2318 result = proc_map_files_instantiate(dentry, task,
2319 (void *)(unsigned long)vma->vm_file->f_mode);
2322 mmap_read_unlock(mm);
2326 put_task_struct(task);
2331 static const struct inode_operations proc_map_files_inode_operations = {
2332 .lookup = proc_map_files_lookup,
2333 .permission = proc_fd_permission,
2334 .setattr = proc_setattr,
2338 proc_map_files_readdir(struct file *file, struct dir_context *ctx)
2340 struct vm_area_struct *vma;
2341 struct task_struct *task;
2342 struct mm_struct *mm;
2343 unsigned long nr_files, pos, i;
2344 GENRADIX(struct map_files_info) fa;
2345 struct map_files_info *p;
2351 task = get_proc_task(file_inode(file));
2356 if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
2360 if (!dir_emit_dots(file, ctx))
2363 mm = get_task_mm(task);
2367 ret = mmap_read_lock_killable(mm);
2376 * We need two passes here:
2378 * 1) Collect vmas of mapped files with mmap_lock taken
2379 * 2) Release mmap_lock and instantiate entries
2381 * otherwise we get lockdep complained, since filldir()
2382 * routine might require mmap_lock taken in might_fault().
2385 for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
2388 if (++pos <= ctx->pos)
2391 p = genradix_ptr_alloc(&fa, nr_files++, GFP_KERNEL);
2394 mmap_read_unlock(mm);
2399 p->start = vma->vm_start;
2400 p->end = vma->vm_end;
2401 p->mode = vma->vm_file->f_mode;
2403 mmap_read_unlock(mm);
2406 for (i = 0; i < nr_files; i++) {
2407 char buf[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */
2410 p = genradix_ptr(&fa, i);
2411 len = snprintf(buf, sizeof(buf), "%lx-%lx", p->start, p->end);
2412 if (!proc_fill_cache(file, ctx,
2414 proc_map_files_instantiate,
2416 (void *)(unsigned long)p->mode))
2422 put_task_struct(task);
2428 static const struct file_operations proc_map_files_operations = {
2429 .read = generic_read_dir,
2430 .iterate_shared = proc_map_files_readdir,
2431 .llseek = generic_file_llseek,
2434 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2435 struct timers_private {
2437 struct task_struct *task;
2438 struct sighand_struct *sighand;
2439 struct pid_namespace *ns;
2440 unsigned long flags;
2443 static void *timers_start(struct seq_file *m, loff_t *pos)
2445 struct timers_private *tp = m->private;
2447 tp->task = get_pid_task(tp->pid, PIDTYPE_PID);
2449 return ERR_PTR(-ESRCH);
2451 tp->sighand = lock_task_sighand(tp->task, &tp->flags);
2453 return ERR_PTR(-ESRCH);
2455 return seq_list_start(&tp->task->signal->posix_timers, *pos);
2458 static void *timers_next(struct seq_file *m, void *v, loff_t *pos)
2460 struct timers_private *tp = m->private;
2461 return seq_list_next(v, &tp->task->signal->posix_timers, pos);
2464 static void timers_stop(struct seq_file *m, void *v)
2466 struct timers_private *tp = m->private;
2469 unlock_task_sighand(tp->task, &tp->flags);
2474 put_task_struct(tp->task);
2479 static int show_timer(struct seq_file *m, void *v)
2481 struct k_itimer *timer;
2482 struct timers_private *tp = m->private;
2484 static const char * const nstr[] = {
2485 [SIGEV_SIGNAL] = "signal",
2486 [SIGEV_NONE] = "none",
2487 [SIGEV_THREAD] = "thread",
2490 timer = list_entry((struct list_head *)v, struct k_itimer, list);
2491 notify = timer->it_sigev_notify;
2493 seq_printf(m, "ID: %d\n", timer->it_id);
2494 seq_printf(m, "signal: %d/%px\n",
2495 timer->sigq->info.si_signo,
2496 timer->sigq->info.si_value.sival_ptr);
2497 seq_printf(m, "notify: %s/%s.%d\n",
2498 nstr[notify & ~SIGEV_THREAD_ID],
2499 (notify & SIGEV_THREAD_ID) ? "tid" : "pid",
2500 pid_nr_ns(timer->it_pid, tp->ns));
2501 seq_printf(m, "ClockID: %d\n", timer->it_clock);
2506 static const struct seq_operations proc_timers_seq_ops = {
2507 .start = timers_start,
2508 .next = timers_next,
2509 .stop = timers_stop,
2513 static int proc_timers_open(struct inode *inode, struct file *file)
2515 struct timers_private *tp;
2517 tp = __seq_open_private(file, &proc_timers_seq_ops,
2518 sizeof(struct timers_private));
2522 tp->pid = proc_pid(inode);
2523 tp->ns = proc_pid_ns(inode->i_sb);
2527 static const struct file_operations proc_timers_operations = {
2528 .open = proc_timers_open,
2530 .llseek = seq_lseek,
2531 .release = seq_release_private,
2535 static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
2536 size_t count, loff_t *offset)
2538 struct inode *inode = file_inode(file);
2539 struct task_struct *p;
2543 err = kstrtoull_from_user(buf, count, 10, &slack_ns);
2547 p = get_proc_task(inode);
2553 if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) {
2560 err = security_task_setscheduler(p);
2569 p->timer_slack_ns = p->default_timer_slack_ns;
2571 p->timer_slack_ns = slack_ns;
2580 static int timerslack_ns_show(struct seq_file *m, void *v)
2582 struct inode *inode = m->private;
2583 struct task_struct *p;
2586 p = get_proc_task(inode);
2592 if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) {
2599 err = security_task_getscheduler(p);
2605 seq_printf(m, "%llu\n", p->timer_slack_ns);
2614 static int timerslack_ns_open(struct inode *inode, struct file *filp)
2616 return single_open(filp, timerslack_ns_show, inode);
2619 static const struct file_operations proc_pid_set_timerslack_ns_operations = {
2620 .open = timerslack_ns_open,
2622 .write = timerslack_ns_write,
2623 .llseek = seq_lseek,
2624 .release = single_release,
2627 static struct dentry *proc_pident_instantiate(struct dentry *dentry,
2628 struct task_struct *task, const void *ptr)
2630 const struct pid_entry *p = ptr;
2631 struct inode *inode;
2632 struct proc_inode *ei;
2634 inode = proc_pid_make_inode(dentry->d_sb, task, p->mode);
2636 return ERR_PTR(-ENOENT);
2639 if (S_ISDIR(inode->i_mode))
2640 set_nlink(inode, 2); /* Use getattr to fix if necessary */
2642 inode->i_op = p->iop;
2644 inode->i_fop = p->fop;
2646 pid_update_inode(task, inode);
2647 d_set_d_op(dentry, &pid_dentry_operations);
2648 return d_splice_alias(inode, dentry);
2651 static struct dentry *proc_pident_lookup(struct inode *dir,
2652 struct dentry *dentry,
2653 const struct pid_entry *p,
2654 const struct pid_entry *end)
2656 struct task_struct *task = get_proc_task(dir);
2657 struct dentry *res = ERR_PTR(-ENOENT);
2663 * Yes, it does not scale. And it should not. Don't add
2664 * new entries into /proc/<tgid>/ without very good reasons.
2666 for (; p < end; p++) {
2667 if (p->len != dentry->d_name.len)
2669 if (!memcmp(dentry->d_name.name, p->name, p->len)) {
2670 res = proc_pident_instantiate(dentry, task, p);
2674 put_task_struct(task);
2679 static int proc_pident_readdir(struct file *file, struct dir_context *ctx,
2680 const struct pid_entry *ents, unsigned int nents)
2682 struct task_struct *task = get_proc_task(file_inode(file));
2683 const struct pid_entry *p;
2688 if (!dir_emit_dots(file, ctx))
2691 if (ctx->pos >= nents + 2)
2694 for (p = ents + (ctx->pos - 2); p < ents + nents; p++) {
2695 if (!proc_fill_cache(file, ctx, p->name, p->len,
2696 proc_pident_instantiate, task, p))
2701 put_task_struct(task);
2705 #ifdef CONFIG_SECURITY
2706 static int proc_pid_attr_open(struct inode *inode, struct file *file)
2708 file->private_data = NULL;
2709 __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS);
2713 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2714 size_t count, loff_t *ppos)
2716 struct inode * inode = file_inode(file);
2719 struct task_struct *task = get_proc_task(inode);
2724 length = security_getprocattr(task, PROC_I(inode)->op.lsm,
2725 (char*)file->f_path.dentry->d_name.name,
2727 put_task_struct(task);
2729 length = simple_read_from_buffer(buf, count, ppos, p, length);
2734 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2735 size_t count, loff_t *ppos)
2737 struct inode * inode = file_inode(file);
2738 struct task_struct *task;
2742 /* A task may only write when it was the opener. */
2743 if (file->private_data != current->mm)
2747 task = pid_task(proc_pid(inode), PIDTYPE_PID);
2752 /* A task may only write its own attributes. */
2753 if (current != task) {
2757 /* Prevent changes to overridden credentials. */
2758 if (current_cred() != current_real_cred()) {
2764 if (count > PAGE_SIZE)
2767 /* No partial writes. */
2771 page = memdup_user(buf, count);
2777 /* Guard against adverse ptrace interaction */
2778 rv = mutex_lock_interruptible(¤t->signal->cred_guard_mutex);
2782 rv = security_setprocattr(PROC_I(inode)->op.lsm,
2783 file->f_path.dentry->d_name.name, page,
2785 mutex_unlock(¤t->signal->cred_guard_mutex);
2792 static const struct file_operations proc_pid_attr_operations = {
2793 .open = proc_pid_attr_open,
2794 .read = proc_pid_attr_read,
2795 .write = proc_pid_attr_write,
2796 .llseek = generic_file_llseek,
2797 .release = mem_release,
2800 #define LSM_DIR_OPS(LSM) \
2801 static int proc_##LSM##_attr_dir_iterate(struct file *filp, \
2802 struct dir_context *ctx) \
2804 return proc_pident_readdir(filp, ctx, \
2805 LSM##_attr_dir_stuff, \
2806 ARRAY_SIZE(LSM##_attr_dir_stuff)); \
2809 static const struct file_operations proc_##LSM##_attr_dir_ops = { \
2810 .read = generic_read_dir, \
2811 .iterate = proc_##LSM##_attr_dir_iterate, \
2812 .llseek = default_llseek, \
2815 static struct dentry *proc_##LSM##_attr_dir_lookup(struct inode *dir, \
2816 struct dentry *dentry, unsigned int flags) \
2818 return proc_pident_lookup(dir, dentry, \
2819 LSM##_attr_dir_stuff, \
2820 LSM##_attr_dir_stuff + ARRAY_SIZE(LSM##_attr_dir_stuff)); \
2823 static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \
2824 .lookup = proc_##LSM##_attr_dir_lookup, \
2825 .getattr = pid_getattr, \
2826 .setattr = proc_setattr, \
2829 #ifdef CONFIG_SECURITY_SMACK
2830 static const struct pid_entry smack_attr_dir_stuff[] = {
2831 ATTR("smack", "current", 0666),
2836 #ifdef CONFIG_SECURITY_APPARMOR
2837 static const struct pid_entry apparmor_attr_dir_stuff[] = {
2838 ATTR("apparmor", "current", 0666),
2839 ATTR("apparmor", "prev", 0444),
2840 ATTR("apparmor", "exec", 0666),
2842 LSM_DIR_OPS(apparmor);
2845 static const struct pid_entry attr_dir_stuff[] = {
2846 ATTR(NULL, "current", 0666),
2847 ATTR(NULL, "prev", 0444),
2848 ATTR(NULL, "exec", 0666),
2849 ATTR(NULL, "fscreate", 0666),
2850 ATTR(NULL, "keycreate", 0666),
2851 ATTR(NULL, "sockcreate", 0666),
2852 #ifdef CONFIG_SECURITY_SMACK
2854 proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
2856 #ifdef CONFIG_SECURITY_APPARMOR
2857 DIR("apparmor", 0555,
2858 proc_apparmor_attr_dir_inode_ops, proc_apparmor_attr_dir_ops),
2862 static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx)
2864 return proc_pident_readdir(file, ctx,
2865 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
2868 static const struct file_operations proc_attr_dir_operations = {
2869 .read = generic_read_dir,
2870 .iterate_shared = proc_attr_dir_readdir,
2871 .llseek = generic_file_llseek,
2874 static struct dentry *proc_attr_dir_lookup(struct inode *dir,
2875 struct dentry *dentry, unsigned int flags)
2877 return proc_pident_lookup(dir, dentry,
2879 attr_dir_stuff + ARRAY_SIZE(attr_dir_stuff));
2882 static const struct inode_operations proc_attr_dir_inode_operations = {
2883 .lookup = proc_attr_dir_lookup,
2884 .getattr = pid_getattr,
2885 .setattr = proc_setattr,
2890 #ifdef CONFIG_ELF_CORE
2891 static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2892 size_t count, loff_t *ppos)
2894 struct task_struct *task = get_proc_task(file_inode(file));
2895 struct mm_struct *mm;
2896 char buffer[PROC_NUMBUF];
2904 mm = get_task_mm(task);
2906 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2907 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2908 MMF_DUMP_FILTER_SHIFT));
2910 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2913 put_task_struct(task);
2918 static ssize_t proc_coredump_filter_write(struct file *file,
2919 const char __user *buf,
2923 struct task_struct *task;
2924 struct mm_struct *mm;
2930 ret = kstrtouint_from_user(buf, count, 0, &val);
2935 task = get_proc_task(file_inode(file));
2939 mm = get_task_mm(task);
2944 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2946 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2948 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2953 put_task_struct(task);
2960 static const struct file_operations proc_coredump_filter_operations = {
2961 .read = proc_coredump_filter_read,
2962 .write = proc_coredump_filter_write,
2963 .llseek = generic_file_llseek,
2967 #ifdef CONFIG_TASK_IO_ACCOUNTING
2968 static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole)
2970 struct task_io_accounting acct = task->ioac;
2971 unsigned long flags;
2974 result = down_read_killable(&task->signal->exec_update_lock);
2978 if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) {
2983 if (whole && lock_task_sighand(task, &flags)) {
2984 struct task_struct *t = task;
2986 task_io_accounting_add(&acct, &task->signal->ioac);
2987 while_each_thread(task, t)
2988 task_io_accounting_add(&acct, &t->ioac);
2990 unlock_task_sighand(task, &flags);
2997 "read_bytes: %llu\n"
2998 "write_bytes: %llu\n"
2999 "cancelled_write_bytes: %llu\n",
3000 (unsigned long long)acct.rchar,
3001 (unsigned long long)acct.wchar,
3002 (unsigned long long)acct.syscr,
3003 (unsigned long long)acct.syscw,
3004 (unsigned long long)acct.read_bytes,
3005 (unsigned long long)acct.write_bytes,
3006 (unsigned long long)acct.cancelled_write_bytes);
3010 up_read(&task->signal->exec_update_lock);
3014 static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
3015 struct pid *pid, struct task_struct *task)
3017 return do_io_accounting(task, m, 0);
3020 static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
3021 struct pid *pid, struct task_struct *task)
3023 return do_io_accounting(task, m, 1);
3025 #endif /* CONFIG_TASK_IO_ACCOUNTING */
3027 #ifdef CONFIG_USER_NS
3028 static int proc_id_map_open(struct inode *inode, struct file *file,
3029 const struct seq_operations *seq_ops)
3031 struct user_namespace *ns = NULL;
3032 struct task_struct *task;
3033 struct seq_file *seq;
3036 task = get_proc_task(inode);
3039 ns = get_user_ns(task_cred_xxx(task, user_ns));
3041 put_task_struct(task);
3046 ret = seq_open(file, seq_ops);
3050 seq = file->private_data;
3060 static int proc_id_map_release(struct inode *inode, struct file *file)
3062 struct seq_file *seq = file->private_data;
3063 struct user_namespace *ns = seq->private;
3065 return seq_release(inode, file);
3068 static int proc_uid_map_open(struct inode *inode, struct file *file)
3070 return proc_id_map_open(inode, file, &proc_uid_seq_operations);
3073 static int proc_gid_map_open(struct inode *inode, struct file *file)
3075 return proc_id_map_open(inode, file, &proc_gid_seq_operations);
3078 static int proc_projid_map_open(struct inode *inode, struct file *file)
3080 return proc_id_map_open(inode, file, &proc_projid_seq_operations);
3083 static const struct file_operations proc_uid_map_operations = {
3084 .open = proc_uid_map_open,
3085 .write = proc_uid_map_write,
3087 .llseek = seq_lseek,
3088 .release = proc_id_map_release,
3091 static const struct file_operations proc_gid_map_operations = {
3092 .open = proc_gid_map_open,
3093 .write = proc_gid_map_write,
3095 .llseek = seq_lseek,
3096 .release = proc_id_map_release,
3099 static const struct file_operations proc_projid_map_operations = {
3100 .open = proc_projid_map_open,
3101 .write = proc_projid_map_write,
3103 .llseek = seq_lseek,
3104 .release = proc_id_map_release,
3107 static int proc_setgroups_open(struct inode *inode, struct file *file)
3109 struct user_namespace *ns = NULL;
3110 struct task_struct *task;
3114 task = get_proc_task(inode);
3117 ns = get_user_ns(task_cred_xxx(task, user_ns));
3119 put_task_struct(task);
3124 if (file->f_mode & FMODE_WRITE) {
3126 if (!ns_capable(ns, CAP_SYS_ADMIN))
3130 ret = single_open(file, &proc_setgroups_show, ns);
3141 static int proc_setgroups_release(struct inode *inode, struct file *file)
3143 struct seq_file *seq = file->private_data;
3144 struct user_namespace *ns = seq->private;
3145 int ret = single_release(inode, file);
3150 static const struct file_operations proc_setgroups_operations = {
3151 .open = proc_setgroups_open,
3152 .write = proc_setgroups_write,
3154 .llseek = seq_lseek,
3155 .release = proc_setgroups_release,
3157 #endif /* CONFIG_USER_NS */
3159 static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
3160 struct pid *pid, struct task_struct *task)
3162 int err = lock_trace(task);
3164 seq_printf(m, "%08x\n", task->personality);
3170 #ifdef CONFIG_LIVEPATCH
3171 static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns,
3172 struct pid *pid, struct task_struct *task)
3174 seq_printf(m, "%d\n", task->patch_state);
3177 #endif /* CONFIG_LIVEPATCH */
3179 #ifdef CONFIG_STACKLEAK_METRICS
3180 static int proc_stack_depth(struct seq_file *m, struct pid_namespace *ns,
3181 struct pid *pid, struct task_struct *task)
3183 unsigned long prev_depth = THREAD_SIZE -
3184 (task->prev_lowest_stack & (THREAD_SIZE - 1));
3185 unsigned long depth = THREAD_SIZE -
3186 (task->lowest_stack & (THREAD_SIZE - 1));
3188 seq_printf(m, "previous stack depth: %lu\nstack depth: %lu\n",
3192 #endif /* CONFIG_STACKLEAK_METRICS */
3197 static const struct file_operations proc_task_operations;
3198 static const struct inode_operations proc_task_inode_operations;
3200 static const struct pid_entry tgid_base_stuff[] = {
3201 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
3202 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3203 DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
3204 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
3205 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
3207 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
3209 REG("environ", S_IRUSR, proc_environ_operations),
3210 REG("auxv", S_IRUSR, proc_auxv_operations),
3211 ONE("status", S_IRUGO, proc_pid_status),
3212 ONE("personality", S_IRUSR, proc_pid_personality),
3213 ONE("limits", S_IRUGO, proc_pid_limits),
3214 #ifdef CONFIG_SCHED_DEBUG
3215 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
3217 #ifdef CONFIG_SCHED_AUTOGROUP
3218 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
3220 #ifdef CONFIG_TIME_NS
3221 REG("timens_offsets", S_IRUGO|S_IWUSR, proc_timens_offsets_operations),
3223 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
3224 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3225 ONE("syscall", S_IRUSR, proc_pid_syscall),
3227 REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
3228 ONE("stat", S_IRUGO, proc_tgid_stat),
3229 ONE("statm", S_IRUGO, proc_pid_statm),
3230 REG("maps", S_IRUGO, proc_pid_maps_operations),
3232 REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
3234 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3235 LNK("cwd", proc_cwd_link),
3236 LNK("root", proc_root_link),
3237 LNK("exe", proc_exe_link),
3238 REG("mounts", S_IRUGO, proc_mounts_operations),
3239 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3240 REG("mountstats", S_IRUSR, proc_mountstats_operations),
3241 #ifdef CONFIG_PROC_PAGE_MONITOR
3242 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3243 REG("smaps", S_IRUGO, proc_pid_smaps_operations),
3244 REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations),
3245 REG("pagemap", S_IRUSR, proc_pagemap_operations),
3247 #ifdef CONFIG_SECURITY
3248 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
3250 #ifdef CONFIG_KALLSYMS
3251 ONE("wchan", S_IRUGO, proc_pid_wchan),
3253 #ifdef CONFIG_STACKTRACE
3254 ONE("stack", S_IRUSR, proc_pid_stack),
3256 #ifdef CONFIG_SCHED_INFO
3257 ONE("schedstat", S_IRUGO, proc_pid_schedstat),
3259 #ifdef CONFIG_LATENCYTOP
3260 REG("latency", S_IRUGO, proc_lstats_operations),
3262 #ifdef CONFIG_PROC_PID_CPUSET
3263 ONE("cpuset", S_IRUGO, proc_cpuset_show),
3265 #ifdef CONFIG_CGROUPS
3266 ONE("cgroup", S_IRUGO, proc_cgroup_show),
3268 #ifdef CONFIG_PROC_CPU_RESCTRL
3269 ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show),
3271 ONE("oom_score", S_IRUGO, proc_oom_score),
3272 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
3273 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
3275 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3276 REG("sessionid", S_IRUGO, proc_sessionid_operations),
3278 #ifdef CONFIG_FAULT_INJECTION
3279 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
3280 REG("fail-nth", 0644, proc_fail_nth_operations),
3282 #ifdef CONFIG_ELF_CORE
3283 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3285 #ifdef CONFIG_TASK_IO_ACCOUNTING
3286 ONE("io", S_IRUSR, proc_tgid_io_accounting),
3288 #ifdef CONFIG_USER_NS
3289 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
3290 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
3291 REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
3292 REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
3294 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
3295 REG("timers", S_IRUGO, proc_timers_operations),
3297 REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations),
3298 #ifdef CONFIG_LIVEPATCH
3299 ONE("patch_state", S_IRUSR, proc_pid_patch_state),
3301 #ifdef CONFIG_STACKLEAK_METRICS
3302 ONE("stack_depth", S_IRUGO, proc_stack_depth),
3304 #ifdef CONFIG_PROC_PID_ARCH_STATUS
3305 ONE("arch_status", S_IRUGO, proc_pid_arch_status),
3309 static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
3311 return proc_pident_readdir(file, ctx,
3312 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
3315 static const struct file_operations proc_tgid_base_operations = {
3316 .read = generic_read_dir,
3317 .iterate_shared = proc_tgid_base_readdir,
3318 .llseek = generic_file_llseek,
3321 struct pid *tgid_pidfd_to_pid(const struct file *file)
3323 if (file->f_op != &proc_tgid_base_operations)
3324 return ERR_PTR(-EBADF);
3326 return proc_pid(file_inode(file));
3329 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
3331 return proc_pident_lookup(dir, dentry,
3333 tgid_base_stuff + ARRAY_SIZE(tgid_base_stuff));
3336 static const struct inode_operations proc_tgid_base_inode_operations = {
3337 .lookup = proc_tgid_base_lookup,
3338 .getattr = pid_getattr,
3339 .setattr = proc_setattr,
3340 .permission = proc_pid_permission,
3344 * proc_flush_pid - Remove dcache entries for @pid from the /proc dcache.
3345 * @pid: pid that should be flushed.
3347 * This function walks a list of inodes (that belong to any proc
3348 * filesystem) that are attached to the pid and flushes them from
3351 * It is safe and reasonable to cache /proc entries for a task until
3352 * that task exits. After that they just clog up the dcache with
3353 * useless entries, possibly causing useful dcache entries to be
3354 * flushed instead. This routine is provided to flush those useless
3355 * dcache entries when a process is reaped.
3357 * NOTE: This routine is just an optimization so it does not guarantee
3358 * that no dcache entries will exist after a process is reaped
3359 * it just makes it very unlikely that any will persist.
3362 void proc_flush_pid(struct pid *pid)
3364 proc_invalidate_siblings_dcache(&pid->inodes, &pid->lock);
3367 static struct dentry *proc_pid_instantiate(struct dentry * dentry,
3368 struct task_struct *task, const void *ptr)
3370 struct inode *inode;
3372 inode = proc_pid_make_base_inode(dentry->d_sb, task,
3373 S_IFDIR | S_IRUGO | S_IXUGO);
3375 return ERR_PTR(-ENOENT);
3377 inode->i_op = &proc_tgid_base_inode_operations;
3378 inode->i_fop = &proc_tgid_base_operations;
3379 inode->i_flags|=S_IMMUTABLE;
3381 set_nlink(inode, nlink_tgid);
3382 pid_update_inode(task, inode);
3384 d_set_d_op(dentry, &pid_dentry_operations);
3385 return d_splice_alias(inode, dentry);
3388 struct dentry *proc_pid_lookup(struct dentry *dentry, unsigned int flags)
3390 struct task_struct *task;
3392 struct proc_fs_info *fs_info;
3393 struct pid_namespace *ns;
3394 struct dentry *result = ERR_PTR(-ENOENT);
3396 tgid = name_to_int(&dentry->d_name);
3400 fs_info = proc_sb_info(dentry->d_sb);
3401 ns = fs_info->pid_ns;
3403 task = find_task_by_pid_ns(tgid, ns);
3405 get_task_struct(task);
3410 /* Limit procfs to only ptraceable tasks */
3411 if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE) {
3412 if (!has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS))
3416 result = proc_pid_instantiate(dentry, task, NULL);
3418 put_task_struct(task);
3424 * Find the first task with tgid >= tgid
3429 struct task_struct *task;
3431 static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3436 put_task_struct(iter.task);
3440 pid = find_ge_pid(iter.tgid, ns);
3442 iter.tgid = pid_nr_ns(pid, ns);
3443 iter.task = pid_task(pid, PIDTYPE_TGID);
3448 get_task_struct(iter.task);
3454 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3456 /* for the /proc/ directory itself, after non-process stuff has been done */
3457 int proc_pid_readdir(struct file *file, struct dir_context *ctx)
3459 struct tgid_iter iter;
3460 struct proc_fs_info *fs_info = proc_sb_info(file_inode(file)->i_sb);
3461 struct pid_namespace *ns = proc_pid_ns(file_inode(file)->i_sb);
3462 loff_t pos = ctx->pos;
3464 if (pos >= PID_MAX_LIMIT + TGID_OFFSET)
3467 if (pos == TGID_OFFSET - 2) {
3468 struct inode *inode = d_inode(fs_info->proc_self);
3469 if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK))
3471 ctx->pos = pos = pos + 1;
3473 if (pos == TGID_OFFSET - 1) {
3474 struct inode *inode = d_inode(fs_info->proc_thread_self);
3475 if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK))
3477 ctx->pos = pos = pos + 1;
3479 iter.tgid = pos - TGID_OFFSET;
3481 for (iter = next_tgid(ns, iter);
3483 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3488 if (!has_pid_permissions(fs_info, iter.task, HIDEPID_INVISIBLE))
3491 len = snprintf(name, sizeof(name), "%u", iter.tgid);
3492 ctx->pos = iter.tgid + TGID_OFFSET;
3493 if (!proc_fill_cache(file, ctx, name, len,
3494 proc_pid_instantiate, iter.task, NULL)) {
3495 put_task_struct(iter.task);
3499 ctx->pos = PID_MAX_LIMIT + TGID_OFFSET;
3504 * proc_tid_comm_permission is a special permission function exclusively
3505 * used for the node /proc/<pid>/task/<tid>/comm.
3506 * It bypasses generic permission checks in the case where a task of the same
3507 * task group attempts to access the node.
3508 * The rationale behind this is that glibc and bionic access this node for
3509 * cross thread naming (pthread_set/getname_np(!self)). However, if
3510 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3511 * which locks out the cross thread naming implementation.
3512 * This function makes sure that the node is always accessible for members of
3513 * same thread group.
3515 static int proc_tid_comm_permission(struct inode *inode, int mask)
3517 bool is_same_tgroup;
3518 struct task_struct *task;
3520 task = get_proc_task(inode);
3523 is_same_tgroup = same_thread_group(current, task);
3524 put_task_struct(task);
3526 if (likely(is_same_tgroup && !(mask & MAY_EXEC))) {
3527 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3528 * read or written by the members of the corresponding
3534 return generic_permission(inode, mask);
3537 static const struct inode_operations proc_tid_comm_inode_operations = {
3538 .setattr = proc_setattr,
3539 .permission = proc_tid_comm_permission,
3545 static const struct pid_entry tid_base_stuff[] = {
3546 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3547 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
3548 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
3550 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
3552 REG("environ", S_IRUSR, proc_environ_operations),
3553 REG("auxv", S_IRUSR, proc_auxv_operations),
3554 ONE("status", S_IRUGO, proc_pid_status),
3555 ONE("personality", S_IRUSR, proc_pid_personality),
3556 ONE("limits", S_IRUGO, proc_pid_limits),
3557 #ifdef CONFIG_SCHED_DEBUG
3558 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
3560 NOD("comm", S_IFREG|S_IRUGO|S_IWUSR,
3561 &proc_tid_comm_inode_operations,
3562 &proc_pid_set_comm_operations, {}),
3563 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3564 ONE("syscall", S_IRUSR, proc_pid_syscall),
3566 REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
3567 ONE("stat", S_IRUGO, proc_tid_stat),
3568 ONE("statm", S_IRUGO, proc_pid_statm),
3569 REG("maps", S_IRUGO, proc_pid_maps_operations),
3570 #ifdef CONFIG_PROC_CHILDREN
3571 REG("children", S_IRUGO, proc_tid_children_operations),
3574 REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
3576 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3577 LNK("cwd", proc_cwd_link),
3578 LNK("root", proc_root_link),
3579 LNK("exe", proc_exe_link),
3580 REG("mounts", S_IRUGO, proc_mounts_operations),
3581 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3582 #ifdef CONFIG_PROC_PAGE_MONITOR
3583 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3584 REG("smaps", S_IRUGO, proc_pid_smaps_operations),
3585 REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations),
3586 REG("pagemap", S_IRUSR, proc_pagemap_operations),
3588 #ifdef CONFIG_SECURITY
3589 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
3591 #ifdef CONFIG_KALLSYMS
3592 ONE("wchan", S_IRUGO, proc_pid_wchan),
3594 #ifdef CONFIG_STACKTRACE
3595 ONE("stack", S_IRUSR, proc_pid_stack),
3597 #ifdef CONFIG_SCHED_INFO
3598 ONE("schedstat", S_IRUGO, proc_pid_schedstat),
3600 #ifdef CONFIG_LATENCYTOP
3601 REG("latency", S_IRUGO, proc_lstats_operations),
3603 #ifdef CONFIG_PROC_PID_CPUSET
3604 ONE("cpuset", S_IRUGO, proc_cpuset_show),
3606 #ifdef CONFIG_CGROUPS
3607 ONE("cgroup", S_IRUGO, proc_cgroup_show),
3609 #ifdef CONFIG_PROC_CPU_RESCTRL
3610 ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show),
3612 ONE("oom_score", S_IRUGO, proc_oom_score),
3613 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
3614 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
3616 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3617 REG("sessionid", S_IRUGO, proc_sessionid_operations),
3619 #ifdef CONFIG_FAULT_INJECTION
3620 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
3621 REG("fail-nth", 0644, proc_fail_nth_operations),
3623 #ifdef CONFIG_TASK_IO_ACCOUNTING
3624 ONE("io", S_IRUSR, proc_tid_io_accounting),
3626 #ifdef CONFIG_USER_NS
3627 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
3628 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
3629 REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
3630 REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
3632 #ifdef CONFIG_LIVEPATCH
3633 ONE("patch_state", S_IRUSR, proc_pid_patch_state),
3635 #ifdef CONFIG_PROC_PID_ARCH_STATUS
3636 ONE("arch_status", S_IRUGO, proc_pid_arch_status),
3640 static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx)
3642 return proc_pident_readdir(file, ctx,
3643 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
3646 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
3648 return proc_pident_lookup(dir, dentry,
3650 tid_base_stuff + ARRAY_SIZE(tid_base_stuff));
3653 static const struct file_operations proc_tid_base_operations = {
3654 .read = generic_read_dir,
3655 .iterate_shared = proc_tid_base_readdir,
3656 .llseek = generic_file_llseek,
3659 static const struct inode_operations proc_tid_base_inode_operations = {
3660 .lookup = proc_tid_base_lookup,
3661 .getattr = pid_getattr,
3662 .setattr = proc_setattr,
3665 static struct dentry *proc_task_instantiate(struct dentry *dentry,
3666 struct task_struct *task, const void *ptr)
3668 struct inode *inode;
3669 inode = proc_pid_make_base_inode(dentry->d_sb, task,
3670 S_IFDIR | S_IRUGO | S_IXUGO);
3672 return ERR_PTR(-ENOENT);
3674 inode->i_op = &proc_tid_base_inode_operations;
3675 inode->i_fop = &proc_tid_base_operations;
3676 inode->i_flags |= S_IMMUTABLE;
3678 set_nlink(inode, nlink_tid);
3679 pid_update_inode(task, inode);
3681 d_set_d_op(dentry, &pid_dentry_operations);
3682 return d_splice_alias(inode, dentry);
3685 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
3687 struct task_struct *task;
3688 struct task_struct *leader = get_proc_task(dir);
3690 struct proc_fs_info *fs_info;
3691 struct pid_namespace *ns;
3692 struct dentry *result = ERR_PTR(-ENOENT);
3697 tid = name_to_int(&dentry->d_name);
3701 fs_info = proc_sb_info(dentry->d_sb);
3702 ns = fs_info->pid_ns;
3704 task = find_task_by_pid_ns(tid, ns);
3706 get_task_struct(task);
3710 if (!same_thread_group(leader, task))
3713 result = proc_task_instantiate(dentry, task, NULL);
3715 put_task_struct(task);
3717 put_task_struct(leader);
3723 * Find the first tid of a thread group to return to user space.
3725 * Usually this is just the thread group leader, but if the users
3726 * buffer was too small or there was a seek into the middle of the
3727 * directory we have more work todo.
3729 * In the case of a short read we start with find_task_by_pid.
3731 * In the case of a seek we start with the leader and walk nr
3734 static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos,
3735 struct pid_namespace *ns)
3737 struct task_struct *pos, *task;
3738 unsigned long nr = f_pos;
3740 if (nr != f_pos) /* 32bit overflow? */
3744 task = pid_task(pid, PIDTYPE_PID);
3748 /* Attempt to start with the tid of a thread */
3750 pos = find_task_by_pid_ns(tid, ns);
3751 if (pos && same_thread_group(pos, task))
3755 /* If nr exceeds the number of threads there is nothing todo */
3756 if (nr >= get_nr_threads(task))
3759 /* If we haven't found our starting place yet start
3760 * with the leader and walk nr threads forward.
3762 pos = task = task->group_leader;
3766 } while_each_thread(task, pos);
3771 get_task_struct(pos);
3778 * Find the next thread in the thread list.
3779 * Return NULL if there is an error or no next thread.
3781 * The reference to the input task_struct is released.
3783 static struct task_struct *next_tid(struct task_struct *start)
3785 struct task_struct *pos = NULL;
3787 if (pid_alive(start)) {
3788 pos = next_thread(start);
3789 if (thread_group_leader(pos))
3792 get_task_struct(pos);
3795 put_task_struct(start);
3799 /* for the /proc/TGID/task/ directories */
3800 static int proc_task_readdir(struct file *file, struct dir_context *ctx)
3802 struct inode *inode = file_inode(file);
3803 struct task_struct *task;
3804 struct pid_namespace *ns;
3807 if (proc_inode_is_dead(inode))
3810 if (!dir_emit_dots(file, ctx))
3813 /* f_version caches the tgid value that the last readdir call couldn't
3814 * return. lseek aka telldir automagically resets f_version to 0.
3816 ns = proc_pid_ns(inode->i_sb);
3817 tid = (int)file->f_version;
3818 file->f_version = 0;
3819 for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns);
3821 task = next_tid(task), ctx->pos++) {
3824 tid = task_pid_nr_ns(task, ns);
3825 len = snprintf(name, sizeof(name), "%u", tid);
3826 if (!proc_fill_cache(file, ctx, name, len,
3827 proc_task_instantiate, task, NULL)) {
3828 /* returning this tgid failed, save it as the first
3829 * pid for the next readir call */
3830 file->f_version = (u64)tid;
3831 put_task_struct(task);
3839 static int proc_task_getattr(const struct path *path, struct kstat *stat,
3840 u32 request_mask, unsigned int query_flags)
3842 struct inode *inode = d_inode(path->dentry);
3843 struct task_struct *p = get_proc_task(inode);
3844 generic_fillattr(inode, stat);
3847 stat->nlink += get_nr_threads(p);
3854 static const struct inode_operations proc_task_inode_operations = {
3855 .lookup = proc_task_lookup,
3856 .getattr = proc_task_getattr,
3857 .setattr = proc_setattr,
3858 .permission = proc_pid_permission,
3861 static const struct file_operations proc_task_operations = {
3862 .read = generic_read_dir,
3863 .iterate_shared = proc_task_readdir,
3864 .llseek = generic_file_llseek,
3867 void __init set_proc_pid_nlink(void)
3869 nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
3870 nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));