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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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SPDX-License-Identifier: GPL-2.0/* * linux/fs/proc/base.c * * Copyright (C) 1991, 1992 Linus Torvalds * * proc base directory handling functions * * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. * Instead of using magical inumbers to determine the kind of object * we allocate and fill in-core inodes upon lookup. They don't even * go into icache. We cache the reference to task_struct upon lookup too. * Eventually it should become a filesystem in its own. We don't use the * rest of procfs anymore. * * * Changelog: * 17-Jan-2005 * Allan Bezerra * Bruna Moreira <bruna.moreira@indt.org.br> * Edjard Mota <edjard.mota@indt.org.br> * Ilias Biris <ilias.biris@indt.org.br> * Mauricio Lin <mauricio.lin@indt.org.br> * * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT * * A new process specific entry (smaps) included in /proc. It shows the * size of rss for each memory area. The maps entry lacks information * about physical memory size (rss) for each mapped file, i.e., * rss information for executables and library files. * This additional information is useful for any tools that need to know * about physical memory consumption for a process specific library. * * Changelog: * 21-Feb-2005 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT * Pud inclusion in the page table walking. * * ChangeLog: * 10-Mar-2005 * 10LE Instituto Nokia de Tecnologia - INdT: * A better way to walks through the page table as suggested by Hugh Dickins. * * Simo Piiroinen <simo.piiroinen@nokia.com>: * Smaps information related to shared, private, clean and dirty pages. * * Paul Mundt <paul.mundt@nokia.com>: * Overall revision about smaps. */
#include <linux/uaccess.h>
#include <linux/errno.h>#include <linux/time.h>#include <linux/proc_fs.h>#include <linux/stat.h>#include <linux/task_io_accounting_ops.h>#include <linux/init.h>#include <linux/capability.h>#include <linux/file.h>#include <linux/generic-radix-tree.h>#include <linux/string.h>#include <linux/seq_file.h>#include <linux/namei.h>#include <linux/mnt_namespace.h>#include <linux/mm.h>#include <linux/swap.h>#include <linux/rcupdate.h>#include <linux/kallsyms.h>#include <linux/stacktrace.h>#include <linux/resource.h>#include <linux/module.h>#include <linux/mount.h>#include <linux/security.h>#include <linux/ptrace.h>#include <linux/printk.h>#include <linux/cache.h>#include <linux/cgroup.h>#include <linux/cpuset.h>#include <linux/audit.h>#include <linux/poll.h>#include <linux/nsproxy.h>#include <linux/oom.h>#include <linux/elf.h>#include <linux/pid_namespace.h>#include <linux/user_namespace.h>#include <linux/fs_parser.h>#include <linux/fs_struct.h>#include <linux/slab.h>#include <linux/sched/autogroup.h>#include <linux/sched/mm.h>#include <linux/sched/coredump.h>#include <linux/sched/debug.h>#include <linux/sched/exec_state.h>#include <linux/sched/stat.h>#include <linux/posix-timers.h>#include <linux/time_namespace.h>#include <linux/resctrl.h>#include <linux/cn_proc.h>#include <linux/ksm.h>#include <uapi/linux/lsm.h>#include <trace/events/oom.h>#include "internal.h"#include "fd.h"
#include "../../lib/kstrtox.h"
/* NOTE: * Implementing inode permission operations in /proc is almost * certainly an error. Permission checks need to happen during * each system call not at open time. The reason is that most of * what we wish to check for permissions in /proc varies at runtime. * * The classic example of a problem is opening file descriptors * in /proc for a task before it execs a suid executable. */
static u8 nlink_tid __ro_after_init;static u8 nlink_tgid __ro_after_init;
enum proc_mem_force { PROC_MEM_FORCE_ALWAYS, PROC_MEM_FORCE_PTRACE, PROC_MEM_FORCE_NEVER};
static enum proc_mem_force proc_mem_force_override __ro_after_init = IS_ENABLED(CONFIG_PROC_MEM_NO_FORCE) ? PROC_MEM_FORCE_NEVER : IS_ENABLED(CONFIG_PROC_MEM_FORCE_PTRACE) ? PROC_MEM_FORCE_PTRACE : PROC_MEM_FORCE_ALWAYS;
static const struct constant_table proc_mem_force_table[] __initconst = { { "always", PROC_MEM_FORCE_ALWAYS }, { "ptrace", PROC_MEM_FORCE_PTRACE }, { "never", PROC_MEM_FORCE_NEVER }, { }};
static int __init early_proc_mem_force_override(char *buf){ if (!buf) return -EINVAL;
/* * lookup_constant() defaults to proc_mem_force_override to preseve * the initial Kconfig choice in case an invalid param gets passed. */ proc_mem_force_override = lookup_constant(proc_mem_force_table, buf, proc_mem_force_override);
return 0;}early_param("proc_mem.force_override", early_proc_mem_force_override);
struct pid_entry { const char *name; unsigned int len; umode_t mode; const struct inode_operations *iop; const struct file_operations *fop; union proc_op op;};
#define NOD(NAME, MODE, IOP, FOP, OP) { \ .name = (NAME), \ .len = sizeof(NAME) - 1, \ .mode = MODE, \ .iop = IOP, \ .fop = FOP, \ .op = OP, \}
#define DIR(NAME, MODE, iops, fops) \ NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )#define LNK(NAME, get_link) \ NOD(NAME, (S_IFLNK|S_IRWXUGO), \ &proc_pid_link_inode_operations, NULL, \ { .proc_get_link = get_link } )#define REG(NAME, MODE, fops) \ NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})#define ONE(NAME, MODE, show) \ NOD(NAME, (S_IFREG|(MODE)), \ NULL, &proc_single_file_operations, \ { .proc_show = show } )#define ATTR(LSMID, NAME, MODE) \ NOD(NAME, (S_IFREG|(MODE)), \ NULL, &proc_pid_attr_operations, \ { .lsmid = LSMID })
/* * Count the number of hardlinks for the pid_entry table, excluding the . * and .. links. */static unsigned int __init pid_entry_nlink(const struct pid_entry *entries, unsigned int n){ unsigned int i; unsigned int count;
count = 2; for (i = 0; i < n; ++i) { if (S_ISDIR(entries[i].mode)) ++count; }
return count;}
static int get_task_root(struct task_struct *task, struct path *root){ int result = -ENOENT;
task_lock(task); if (task->real_fs) { get_fs_root(task->real_fs, root); result = 0; } task_unlock(task); return result;}
static int proc_cwd_link(struct dentry *dentry, struct path *path, struct task_struct *task){ int result = -ENOENT;
task_lock(task); if (task->real_fs) { get_fs_pwd(task->real_fs, path); result = 0; } task_unlock(task); return result;}
static int proc_root_link(struct dentry *dentry, struct path *path, struct task_struct *task){ return get_task_root(task, path);}
/* * If the user used setproctitle(), we just get the string from * user space at arg_start, and limit it to a maximum of one page. */static ssize_t get_mm_proctitle(struct mm_struct *mm, char __user *buf, size_t count, unsigned long pos, unsigned long arg_start){ char *page; int ret, got;
if (pos >= PAGE_SIZE) return 0;
page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!page) return -ENOMEM;
ret = 0; got = access_remote_vm(mm, arg_start, page, PAGE_SIZE, FOLL_ANON); if (got > 0) { int len = strnlen(page, got);
/* Include the NUL character if it was found */ if (len < got) len++;
if (len > pos) { len -= pos; if (len > count) len = count; len -= copy_to_user(buf, page+pos, len); if (!len) len = -EFAULT; ret = len; } } kfree(page); return ret;}
static ssize_t get_mm_cmdline(struct mm_struct *mm, char __user *buf, size_t count, loff_t *ppos){ unsigned long arg_start, arg_end, env_start, env_end; unsigned long pos, len; char *page, c;
/* Check if process spawned far enough to have cmdline. */ if (!mm->env_end) return 0;
spin_lock(&mm->arg_lock); arg_start = mm->arg_start; arg_end = mm->arg_end; env_start = mm->env_start; env_end = mm->env_end; spin_unlock(&mm->arg_lock);
if (arg_start >= arg_end) return 0;
/* * We allow setproctitle() to overwrite the argument * strings, and overflow past the original end. But * only when it overflows into the environment area. */ if (env_start != arg_end || env_end < env_start) env_start = env_end = arg_end; len = env_end - arg_start;
/* We're not going to care if "*ppos" has high bits set */ pos = *ppos; if (pos >= len) return 0; if (count > len - pos) count = len - pos; if (!count) return 0;
/* * Magical special case: if the argv[] end byte is not * zero, the user has overwritten it with setproctitle(3). * * Possible future enhancement: do this only once when * pos is 0, and set a flag in the 'struct file'. */ if (access_remote_vm(mm, arg_end-1, &c, 1, FOLL_ANON) == 1 && c) return get_mm_proctitle(mm, buf, count, pos, arg_start);
/* * For the non-setproctitle() case we limit things strictly * to the [arg_start, arg_end[ range. */ pos += arg_start; if (pos < arg_start || pos >= arg_end) return 0; if (count > arg_end - pos) count = arg_end - pos;
page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!page) return -ENOMEM;
len = 0; while (count) { int got; size_t size = min_t(size_t, PAGE_SIZE, count);
got = access_remote_vm(mm, pos, page, size, FOLL_ANON); if (got <= 0) break; got -= copy_to_user(buf, page, got); if (unlikely(!got)) { if (!len) len = -EFAULT; break; } pos += got; buf += got; len += got; count -= got; }
kfree(page); return len;}
static ssize_t get_task_cmdline(struct task_struct *tsk, char __user *buf, size_t count, loff_t *pos){ struct mm_struct *mm; ssize_t ret;
mm = get_task_mm(tsk); if (!mm) return 0;
ret = get_mm_cmdline(mm, buf, count, pos); mmput(mm); return ret;}
static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, size_t count, loff_t *pos){ struct task_struct *tsk; ssize_t ret;
BUG_ON(*pos < 0);
tsk = get_proc_task(file_inode(file)); if (!tsk) return -ESRCH; ret = get_task_cmdline(tsk, buf, count, pos); put_task_struct(tsk); if (ret > 0) *pos += ret; return ret;}
static const struct file_operations proc_pid_cmdline_ops = { .read = proc_pid_cmdline_read, .llseek = generic_file_llseek,};
#ifdef CONFIG_KALLSYMS/* * Provides a wchan file via kallsyms in a proper one-value-per-file format. * Returns the resolved symbol to user space. */static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ unsigned long wchan; char symname[KSYM_NAME_LEN]; int err;
err = down_read_killable(&task->signal->exec_update_lock); if (err) return err; if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) goto print0;
wchan = get_wchan(task); if (wchan && !lookup_symbol_name(wchan, symname)) { seq_puts(m, symname); up_read(&task->signal->exec_update_lock); return 0; }
print0: seq_putc(m, '0'); up_read(&task->signal->exec_update_lock); return 0;}#endif /* CONFIG_KALLSYMS */
static int lock_trace(struct task_struct *task){ int err = down_read_killable(&task->signal->exec_update_lock); if (err) return err; if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) { up_read(&task->signal->exec_update_lock); return -EPERM; } return 0;}
static void unlock_trace(struct task_struct *task){ up_read(&task->signal->exec_update_lock);}
#ifdef CONFIG_STACKTRACE
#define MAX_STACK_TRACE_DEPTH 64
static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ unsigned long *entries; int err;
/* * The ability to racily run the kernel stack unwinder on a running task * and then observe the unwinder output is scary; while it is useful for * debugging kernel issues, it can also allow an attacker to leak kernel * stack contents. * Doing this in a manner that is at least safe from races would require * some work to ensure that the remote task can not be scheduled; and * even then, this would still expose the unwinder as local attack * surface. * Therefore, this interface is restricted to root. */ if (!file_ns_capable(m->file, &init_user_ns, CAP_SYS_ADMIN)) return -EACCES;
entries = kmalloc_array(MAX_STACK_TRACE_DEPTH, sizeof(*entries), GFP_KERNEL); if (!entries) return -ENOMEM;
err = lock_trace(task); if (!err) { unsigned int i, nr_entries;
nr_entries = stack_trace_save_tsk(task, entries, MAX_STACK_TRACE_DEPTH, 0);
for (i = 0; i < nr_entries; i++) { seq_printf(m, "[<0>] %pB\n", (void *)entries[i]); }
unlock_trace(task); } kfree(entries);
return err;}#endif
#ifdef CONFIG_SCHED_INFO/* * Provides /proc/PID/schedstat */static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ if (unlikely(!sched_info_on())) seq_puts(m, "0 0 0\n"); else seq_printf(m, "%llu %llu %lu\n", (unsigned long long)task->se.sum_exec_runtime, (unsigned long long)task->sched_info.run_delay, task->sched_info.pcount);
return 0;}#endif
#ifdef CONFIG_LATENCYTOPstatic int lstats_show_proc(struct seq_file *m, void *v){ int i; struct inode *inode = m->private; struct task_struct *task = get_proc_task(inode);
if (!task) return -ESRCH; seq_puts(m, "Latency Top version : v0.1\n"); for (i = 0; i < LT_SAVECOUNT; i++) { struct latency_record *lr = &task->latency_record[i]; if (lr->backtrace[0]) { int q; seq_printf(m, "%i %li %li", lr->count, lr->time, lr->max); for (q = 0; q < LT_BACKTRACEDEPTH; q++) { unsigned long bt = lr->backtrace[q];
if (!bt) break; seq_printf(m, " %ps", (void *)bt); } seq_putc(m, '\n'); }
} put_task_struct(task); return 0;}
static int lstats_open(struct inode *inode, struct file *file){ return single_open(file, lstats_show_proc, inode);}
static ssize_t lstats_write(struct file *file, const char __user *buf, size_t count, loff_t *offs){ struct task_struct *task = get_proc_task(file_inode(file));
if (!task) return -ESRCH; clear_tsk_latency_tracing(task); put_task_struct(task);
return count;}
static const struct file_operations proc_lstats_operations = { .open = lstats_open, .read = seq_read, .write = lstats_write, .llseek = seq_lseek, .release = single_release,};
#endif
static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ unsigned long totalpages = totalram_pages() + total_swap_pages; unsigned long points = 0; long badness;
badness = oom_badness(task, totalpages); /* * Special case OOM_SCORE_ADJ_MIN for all others scale the * badness value into [0, 2000] range which we have been * exporting for a long time so userspace might depend on it. */ if (badness != LONG_MIN) points = (OOM_SCORE_ADJ_MAX + badness * OOM_SCORE_ADJ_MAX / (long)totalpages) * 2 / 3;
seq_printf(m, "%lu\n", points);
return 0;}
struct limit_names { const char *name; const char *unit;};
static const struct limit_names lnames[RLIM_NLIMITS] = { [RLIMIT_CPU] = {"Max cpu time", "seconds"}, [RLIMIT_FSIZE] = {"Max file size", "bytes"}, [RLIMIT_DATA] = {"Max data size", "bytes"}, [RLIMIT_STACK] = {"Max stack size", "bytes"}, [RLIMIT_CORE] = {"Max core file size", "bytes"}, [RLIMIT_RSS] = {"Max resident set", "bytes"}, [RLIMIT_NPROC] = {"Max processes", "processes"}, [RLIMIT_NOFILE] = {"Max open files", "files"}, [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, [RLIMIT_AS] = {"Max address space", "bytes"}, [RLIMIT_LOCKS] = {"Max file locks", "locks"}, [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, [RLIMIT_NICE] = {"Max nice priority", NULL}, [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},};
/* Display limits for a process */static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ unsigned int i; unsigned long flags;
struct rlimit rlim[RLIM_NLIMITS];
if (!lock_task_sighand(task, &flags)) return 0; memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); unlock_task_sighand(task, &flags);
/* * print the file header */ seq_puts(m, "Limit " "Soft Limit " "Hard Limit " "Units \n");
for (i = 0; i < RLIM_NLIMITS; i++) { if (rlim[i].rlim_cur == RLIM_INFINITY) seq_printf(m, "%-25s %-20s ", lnames[i].name, "unlimited"); else seq_printf(m, "%-25s %-20lu ", lnames[i].name, rlim[i].rlim_cur);
if (rlim[i].rlim_max == RLIM_INFINITY) seq_printf(m, "%-20s ", "unlimited"); else seq_printf(m, "%-20lu ", rlim[i].rlim_max);
if (lnames[i].unit) seq_printf(m, "%-10s\n", lnames[i].unit); else seq_putc(m, '\n'); }
return 0;}
#ifdef CONFIG_HAVE_ARCH_TRACEHOOKstatic int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ struct syscall_info info; u64 *args = &info.data.args[0]; int res;
res = lock_trace(task); if (res) return res;
if (task_current_syscall(task, &info)) seq_puts(m, "running\n"); else if (info.data.nr < 0) seq_printf(m, "%d 0x%llx 0x%llx\n", info.data.nr, info.sp, info.data.instruction_pointer); else seq_printf(m, "%d 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx\n", info.data.nr, args[0], args[1], args[2], args[3], args[4], args[5], info.sp, info.data.instruction_pointer); unlock_trace(task);
return 0;}#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
/************************************************************************//* Here the fs part begins *//************************************************************************/
int proc_nochmod_setattr(const struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *attr){ int error; struct inode *inode = d_inode(dentry);
if (attr->ia_valid & ATTR_MODE) return -EPERM;
error = setattr_prepare(&nop_mnt_idmap, dentry, attr); if (error) return error;
setattr_copy(&nop_mnt_idmap, inode, attr); return 0;}
/* * May current process learn task's sched/cmdline info (for hide_pid_min=1) * or euid/egid (for hide_pid_min=2)? */static bool has_pid_permissions(struct proc_fs_info *fs_info, struct task_struct *task, enum proc_hidepid hide_pid_min){ /* * If 'hidpid' mount option is set force a ptrace check, * we indicate that we are using a filesystem syscall * by passing PTRACE_MODE_READ_FSCREDS */ if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE) return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
if (fs_info->hide_pid < hide_pid_min) return true; if (in_group_p(fs_info->pid_gid)) return true; return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);}
static int proc_pid_permission(const struct mnt_idmap *idmap, struct inode *inode, int mask){ struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb); struct task_struct *task; bool has_perms;
task = get_proc_task(inode); if (!task) return -ESRCH; has_perms = has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS); put_task_struct(task);
if (!has_perms) { if (fs_info->hide_pid == HIDEPID_INVISIBLE) { /* * Let's make getdents(), stat(), and open() * consistent with each other. If a process * may not stat() a file, it shouldn't be seen * in procfs at all. */ return -ENOENT; }
return -EPERM; } return generic_permission(&nop_mnt_idmap, inode, mask);}
static const struct inode_operations proc_def_inode_operations = { .setattr = proc_nochmod_setattr,};
static int proc_single_show(struct seq_file *m, void *v){ struct inode *inode = m->private; struct pid_namespace *ns = proc_pid_ns(inode->i_sb); struct pid *pid = proc_pid(inode); struct task_struct *task; int ret;
task = get_pid_task(pid, PIDTYPE_PID); if (!task) return -ESRCH;
ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
put_task_struct(task); return ret;}
static int proc_single_open(struct inode *inode, struct file *filp){ return single_open(filp, proc_single_show, inode);}
static const struct file_operations proc_single_file_operations = { .open = proc_single_open, .read = seq_read, .llseek = seq_lseek, .release = single_release,};
/* * proc_mem_open() can return errno, NULL or mm_struct*. * * - Returns NULL if the task has no mm (PF_KTHREAD or PF_EXITING) * - Returns mm_struct* on success * - Returns error code on failure */struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode){ struct task_struct *task = get_proc_task(inode); struct mm_struct *mm;
if (!task) return ERR_PTR(-ESRCH);
mm = mm_access(task, mode | PTRACE_MODE_FSCREDS); put_task_struct(task);
if (IS_ERR(mm)) return mm == ERR_PTR(-ESRCH) ? NULL : mm;
/* ensure this mm_struct can't be freed */ mmgrab(mm); /* but do not pin its memory */ mmput(mm);
return mm;}
static int __mem_open(struct inode *inode, struct file *file, unsigned int mode){ struct mm_struct *mm = proc_mem_open(inode, mode);
if (IS_ERR_OR_NULL(mm)) return mm ? PTR_ERR(mm) : -ESRCH;
file->private_data = mm; return 0;}
static int mem_open(struct inode *inode, struct file *file){ if (WARN_ON_ONCE(!(file->f_op->fop_flags & FOP_UNSIGNED_OFFSET))) return -EINVAL; return __mem_open(inode, file, PTRACE_MODE_ATTACH);}
static bool proc_mem_foll_force(struct file *file, struct mm_struct *mm){ struct task_struct *task; bool ptrace_active = false;
switch (proc_mem_force_override) { case PROC_MEM_FORCE_NEVER: return false; case PROC_MEM_FORCE_PTRACE: task = get_proc_task(file_inode(file)); if (task) { ptrace_active = READ_ONCE(task->ptrace) && READ_ONCE(task->mm) == mm && READ_ONCE(task->parent) == current; put_task_struct(task); } return ptrace_active; default: return true; }}
static ssize_t mem_rw(struct file *file, char __user *buf, size_t count, loff_t *ppos, int write){ struct mm_struct *mm = file->private_data; unsigned long addr = *ppos; ssize_t copied; char *page; unsigned int flags;
if (!mm) return 0;
page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!page) return -ENOMEM;
copied = 0; if (!mmget_not_zero(mm)) goto free;
flags = write ? FOLL_WRITE : 0; if (proc_mem_foll_force(file, mm)) flags |= FOLL_FORCE;
while (count > 0) { size_t this_len = min_t(size_t, count, PAGE_SIZE);
if (write && copy_from_user(page, buf, this_len)) { copied = -EFAULT; break; }
this_len = access_remote_vm(mm, addr, page, this_len, flags); if (!this_len) { if (!copied) copied = -EIO; break; }
if (!write && copy_to_user(buf, page, this_len)) { copied = -EFAULT; break; }
buf += this_len; addr += this_len; copied += this_len; count -= this_len; } *ppos = addr;
mmput(mm);free: kfree(page); return copied;}
static ssize_t mem_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ return mem_rw(file, buf, count, ppos, 0);}
static ssize_t mem_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){ return mem_rw(file, (char __user*)buf, count, ppos, 1);}
loff_t mem_lseek(struct file *file, loff_t offset, int orig){ switch (orig) { case 0: file->f_pos = offset; break; case 1: file->f_pos += offset; break; default: return -EINVAL; } force_successful_syscall_return(); return file->f_pos;}
static int mem_release(struct inode *inode, struct file *file){ struct mm_struct *mm = file->private_data; if (mm) mmdrop(mm); return 0;}
static const struct file_operations proc_mem_operations = { .llseek = mem_lseek, .read = mem_read, .write = mem_write, .open = mem_open, .release = mem_release, .fop_flags = FOP_UNSIGNED_OFFSET,};
static int environ_open(struct inode *inode, struct file *file){ return __mem_open(inode, file, PTRACE_MODE_READ);}
static ssize_t environ_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ char *page; unsigned long src = *ppos; int ret = 0; struct mm_struct *mm = file->private_data; unsigned long env_start, env_end;
/* Ensure the process spawned far enough to have an environment. */ if (!mm || !mm->env_end) return 0;
page = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!page) return -ENOMEM;
ret = 0; if (!mmget_not_zero(mm)) goto free;
spin_lock(&mm->arg_lock); env_start = mm->env_start; env_end = mm->env_end; spin_unlock(&mm->arg_lock);
while (count > 0) { size_t this_len, max_len; int retval;
if (src >= (env_end - env_start)) break;
this_len = env_end - (env_start + src);
max_len = min_t(size_t, PAGE_SIZE, count); this_len = min(max_len, this_len);
retval = access_remote_vm(mm, (env_start + src), page, this_len, FOLL_ANON);
if (retval <= 0) { ret = retval; break; }
if (copy_to_user(buf, page, retval)) { ret = -EFAULT; break; }
ret += retval; src += retval; buf += retval; count -= retval; } *ppos = src; mmput(mm);
free: kfree(page); return ret;}
static const struct file_operations proc_environ_operations = { .open = environ_open, .read = environ_read, .llseek = generic_file_llseek, .release = mem_release,};
static int auxv_open(struct inode *inode, struct file *file){ return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS);}
static ssize_t auxv_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct mm_struct *mm = file->private_data; unsigned int nwords = 0;
if (!mm) return 0; do { nwords += 2; } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0]));}
static const struct file_operations proc_auxv_operations = { .open = auxv_open, .read = auxv_read, .llseek = generic_file_llseek, .release = mem_release,};
static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct task_struct *task = get_proc_task(file_inode(file)); char buffer[PROC_NUMBUF]; int oom_adj = OOM_ADJUST_MIN; size_t len;
if (!task) return -ESRCH; if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) oom_adj = OOM_ADJUST_MAX; else oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / OOM_SCORE_ADJ_MAX; put_task_struct(task); if (oom_adj > OOM_ADJUST_MAX) oom_adj = OOM_ADJUST_MAX; len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); return simple_read_from_buffer(buf, count, ppos, buffer, len);}
static int __set_oom_adj(struct file *file, int oom_adj, bool legacy){ struct mm_struct *mm = NULL; struct task_struct *task; int err = 0;
task = get_proc_task(file_inode(file)); if (!task) return -ESRCH;
mutex_lock(&oom_adj_mutex); if (legacy) { if (oom_adj < task->signal->oom_score_adj && !capable(CAP_SYS_RESOURCE)) { err = -EACCES; goto err_unlock; } /* * /proc/pid/oom_adj is provided for legacy purposes, ask users to use * /proc/pid/oom_score_adj instead. */ pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", current->comm, task_pid_nr(current), task_pid_nr(task), task_pid_nr(task)); } else { if ((short)oom_adj < task->signal->oom_score_adj_min && !capable(CAP_SYS_RESOURCE)) { err = -EACCES; goto err_unlock; } }
/* * Make sure we will check other processes sharing the mm if this is * not vfrok which wants its own oom_score_adj. * pin the mm so it doesn't go away and get reused after task_unlock */ if (!task->vfork_done) { struct task_struct *p = find_lock_task_mm(task);
if (p) { if (mm_flags_test(MMF_MULTIPROCESS, p->mm)) { mm = p->mm; mmgrab(mm); } task_unlock(p); } }
task->signal->oom_score_adj = oom_adj; if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) task->signal->oom_score_adj_min = (short)oom_adj; trace_oom_score_adj_update(task);
if (mm) { struct task_struct *p;
rcu_read_lock(); for_each_process(p) { if (same_thread_group(task, p)) continue;
/* do not touch kernel threads or the global init */ if (p->flags & PF_KTHREAD || is_global_init(p)) continue;
task_lock(p); if (!p->vfork_done && process_shares_mm(p, mm)) { p->signal->oom_score_adj = oom_adj; if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) p->signal->oom_score_adj_min = (short)oom_adj; } task_unlock(p); } rcu_read_unlock(); mmdrop(mm); }err_unlock: mutex_unlock(&oom_adj_mutex); put_task_struct(task); return err;}
/* * /proc/pid/oom_adj exists solely for backwards compatibility with previous * kernels. The effective policy is defined by oom_score_adj, which has a * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. * Values written to oom_adj are simply mapped linearly to oom_score_adj. * Processes that become oom disabled via oom_adj will still be oom disabled * with this implementation. * * oom_adj cannot be removed since existing userspace binaries use it. */static ssize_t oom_adj_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){ char buffer[PROC_NUMBUF] = {}; int oom_adj; int err;
if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) { err = -EFAULT; goto out; }
err = kstrtoint(strstrip(buffer), 0, &oom_adj); if (err) goto out; if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && oom_adj != OOM_DISABLE) { err = -EINVAL; goto out; }
/* * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum * value is always attainable. */ if (oom_adj == OOM_ADJUST_MAX) oom_adj = OOM_SCORE_ADJ_MAX; else oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;
err = __set_oom_adj(file, oom_adj, true);out: return err < 0 ? err : count;}
static const struct file_operations proc_oom_adj_operations = { .read = oom_adj_read, .write = oom_adj_write, .llseek = generic_file_llseek,};
static ssize_t oom_score_adj_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct task_struct *task = get_proc_task(file_inode(file)); char buffer[PROC_NUMBUF]; short oom_score_adj = OOM_SCORE_ADJ_MIN; size_t len;
if (!task) return -ESRCH; oom_score_adj = task->signal->oom_score_adj; put_task_struct(task); len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); return simple_read_from_buffer(buf, count, ppos, buffer, len);}
static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){ char buffer[PROC_NUMBUF] = {}; int oom_score_adj; int err;
if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) { err = -EFAULT; goto out; }
err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); if (err) goto out; if (oom_score_adj < OOM_SCORE_ADJ_MIN || oom_score_adj > OOM_SCORE_ADJ_MAX) { err = -EINVAL; goto out; }
err = __set_oom_adj(file, oom_score_adj, false);out: return err < 0 ? err : count;}
static const struct file_operations proc_oom_score_adj_operations = { .read = oom_score_adj_read, .write = oom_score_adj_write, .llseek = default_llseek,};
#ifdef CONFIG_AUDIT#define TMPBUFLEN 11static ssize_t proc_loginuid_read(struct file * file, char __user * buf, size_t count, loff_t *ppos){ struct inode * inode = file_inode(file); struct task_struct *task = get_proc_task(inode); ssize_t length; char tmpbuf[TMPBUFLEN];
if (!task) return -ESRCH; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", from_kuid(file->f_cred->user_ns, audit_get_loginuid(task))); put_task_struct(task); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);}
static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos){ struct inode * inode = file_inode(file); uid_t loginuid; kuid_t kloginuid; int rv;
/* Don't let kthreads write their own loginuid */ if (current->flags & PF_KTHREAD) return -EPERM;
rcu_read_lock(); if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { rcu_read_unlock(); return -EPERM; } rcu_read_unlock();
if (*ppos != 0) { /* No partial writes. */ return -EINVAL; }
rv = kstrtou32_from_user(buf, count, 10, &loginuid); if (rv < 0) return rv;
/* is userspace tring to explicitly UNSET the loginuid? */ if (loginuid == AUDIT_UID_UNSET) { kloginuid = INVALID_UID; } else { kloginuid = make_kuid(file->f_cred->user_ns, loginuid); if (!uid_valid(kloginuid)) return -EINVAL; }
rv = audit_set_loginuid(kloginuid); if (rv < 0) return rv; return count;}
static const struct file_operations proc_loginuid_operations = { .read = proc_loginuid_read, .write = proc_loginuid_write, .llseek = generic_file_llseek,};
static ssize_t proc_sessionid_read(struct file * file, char __user * buf, size_t count, loff_t *ppos){ struct inode * inode = file_inode(file); struct task_struct *task = get_proc_task(inode); ssize_t length; char tmpbuf[TMPBUFLEN];
if (!task) return -ESRCH; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", audit_get_sessionid(task)); put_task_struct(task); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);}
static const struct file_operations proc_sessionid_operations = { .read = proc_sessionid_read, .llseek = generic_file_llseek,};#endif
#ifdef CONFIG_FAULT_INJECTIONstatic ssize_t proc_fault_inject_read(struct file * file, char __user * buf, size_t count, loff_t *ppos){ struct task_struct *task = get_proc_task(file_inode(file)); char buffer[PROC_NUMBUF]; size_t len; int make_it_fail;
if (!task) return -ESRCH; make_it_fail = task->make_it_fail; put_task_struct(task);
len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
return simple_read_from_buffer(buf, count, ppos, buffer, len);}
static ssize_t proc_fault_inject_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos){ struct task_struct *task; char buffer[PROC_NUMBUF] = {}; int make_it_fail; int rv;
if (!capable(CAP_SYS_RESOURCE)) return -EPERM;
if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) return -EFAULT; rv = kstrtoint(strstrip(buffer), 0, &make_it_fail); if (rv < 0) return rv; if (make_it_fail < 0 || make_it_fail > 1) return -EINVAL;
task = get_proc_task(file_inode(file)); if (!task) return -ESRCH; task->make_it_fail = make_it_fail; put_task_struct(task);
return count;}
static const struct file_operations proc_fault_inject_operations = { .read = proc_fault_inject_read, .write = proc_fault_inject_write, .llseek = generic_file_llseek,};
static ssize_t proc_fail_nth_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){ struct task_struct *task; int err; unsigned int n;
err = kstrtouint_from_user(buf, count, 0, &n); if (err) return err;
task = get_proc_task(file_inode(file)); if (!task) return -ESRCH; task->fail_nth = n; put_task_struct(task);
return count;}
static ssize_t proc_fail_nth_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct task_struct *task; char numbuf[PROC_NUMBUF]; ssize_t len;
task = get_proc_task(file_inode(file)); if (!task) return -ESRCH; len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth); put_task_struct(task); return simple_read_from_buffer(buf, count, ppos, numbuf, len);}
static const struct file_operations proc_fail_nth_operations = { .read = proc_fail_nth_read, .write = proc_fail_nth_write,};#endif
/* * Print out various scheduling related per-task fields: */static int sched_show(struct seq_file *m, void *v){ struct inode *inode = m->private; struct pid_namespace *ns = proc_pid_ns(inode->i_sb); struct task_struct *p;
p = get_proc_task(inode); if (!p) return -ESRCH; proc_sched_show_task(p, ns, m);
put_task_struct(p);
return 0;}
static ssize_tsched_write(struct file *file, const char __user *buf, size_t count, loff_t *offset){ struct inode *inode = file_inode(file); struct task_struct *p;
p = get_proc_task(inode); if (!p) return -ESRCH; proc_sched_set_task(p);
put_task_struct(p);
return count;}
static int sched_open(struct inode *inode, struct file *filp){ return single_open(filp, sched_show, inode);}
static const struct file_operations proc_pid_sched_operations = { .open = sched_open, .read = seq_read, .write = sched_write, .llseek = seq_lseek, .release = single_release,};
#ifdef CONFIG_SCHED_AUTOGROUP/* * Print out autogroup related information: */static int sched_autogroup_show(struct seq_file *m, void *v){ struct inode *inode = m->private; struct task_struct *p;
p = get_proc_task(inode); if (!p) return -ESRCH; proc_sched_autogroup_show_task(p, m);
put_task_struct(p);
return 0;}
static ssize_tsched_autogroup_write(struct file *file, const char __user *buf, size_t count, loff_t *offset){ struct inode *inode = file_inode(file); struct task_struct *p; char buffer[PROC_NUMBUF] = {}; int nice; int err;
if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) return -EFAULT;
err = kstrtoint(strstrip(buffer), 0, &nice); if (err < 0) return err;
p = get_proc_task(inode); if (!p) return -ESRCH;
err = proc_sched_autogroup_set_nice(p, nice); if (err) count = err;
put_task_struct(p);
return count;}
static int sched_autogroup_open(struct inode *inode, struct file *filp){ int ret;
ret = single_open(filp, sched_autogroup_show, NULL); if (!ret) { struct seq_file *m = filp->private_data;
m->private = inode; } return ret;}
static const struct file_operations proc_pid_sched_autogroup_operations = { .open = sched_autogroup_open, .read = seq_read, .write = sched_autogroup_write, .llseek = seq_lseek, .release = single_release,};
#endif /* CONFIG_SCHED_AUTOGROUP */
#ifdef CONFIG_TIME_NSstatic int timens_offsets_show(struct seq_file *m, void *v){ struct task_struct *p;
p = get_proc_task(file_inode(m->file)); if (!p) return -ESRCH; proc_timens_show_offsets(p, m);
put_task_struct(p);
return 0;}
static ssize_t timens_offsets_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){ struct inode *inode = file_inode(file); struct proc_timens_offset offsets[2]; char *kbuf = NULL, *pos, *next_line; struct task_struct *p; int ret, noffsets;
/* Only allow < page size writes at the beginning of the file */ if ((*ppos != 0) || (count >= PAGE_SIZE)) return -EINVAL;
/* Slurp in the user data */ kbuf = memdup_user_nul(buf, count); if (IS_ERR(kbuf)) return PTR_ERR(kbuf);
/* Parse the user data */ ret = -EINVAL; noffsets = 0; for (pos = kbuf; pos; pos = next_line) { struct proc_timens_offset *off = &offsets[noffsets]; char clock[10]; int err;
/* Find the end of line and ensure we don't look past it */ next_line = strchr(pos, '\n'); if (next_line) { *next_line = '\0'; next_line++; if (*next_line == '\0') next_line = NULL; }
err = sscanf(pos, "%9s %lld %lu", clock, &off->val.tv_sec, &off->val.tv_nsec); if (err != 3 || off->val.tv_nsec >= NSEC_PER_SEC) goto out;
clock[sizeof(clock) - 1] = 0; if (strcmp(clock, "monotonic") == 0 || strcmp(clock, __stringify(CLOCK_MONOTONIC)) == 0) off->clockid = CLOCK_MONOTONIC; else if (strcmp(clock, "boottime") == 0 || strcmp(clock, __stringify(CLOCK_BOOTTIME)) == 0) off->clockid = CLOCK_BOOTTIME; else goto out;
noffsets++; if (noffsets == ARRAY_SIZE(offsets)) { if (next_line) count = next_line - kbuf; break; } }
ret = -ESRCH; p = get_proc_task(inode); if (!p) goto out; ret = proc_timens_set_offset(file, p, offsets, noffsets); put_task_struct(p); if (ret) goto out;
ret = count;out: kfree(kbuf); return ret;}
static int timens_offsets_open(struct inode *inode, struct file *filp){ return single_open(filp, timens_offsets_show, inode);}
static const struct file_operations proc_timens_offsets_operations = { .open = timens_offsets_open, .read = seq_read, .write = timens_offsets_write, .llseek = seq_lseek, .release = single_release,};#endif /* CONFIG_TIME_NS */
static ssize_t comm_write(struct file *file, const char __user *buf, size_t count, loff_t *offset){ struct inode *inode = file_inode(file); struct task_struct *p; char buffer[TASK_COMM_LEN] = {}; const size_t maxlen = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) return -EFAULT;
p = get_proc_task(inode); if (!p) return -ESRCH;
if (same_thread_group(current, p)) { set_task_comm(p, buffer); proc_comm_connector(p); } else count = -EINVAL;
put_task_struct(p);
return count;}
static int comm_show(struct seq_file *m, void *v){ struct inode *inode = m->private; struct task_struct *p;
p = get_proc_task(inode); if (!p) return -ESRCH;
proc_task_name(m, p, false); seq_putc(m, '\n');
put_task_struct(p);
return 0;}
static int comm_open(struct inode *inode, struct file *filp){ return single_open(filp, comm_show, inode);}
static const struct file_operations proc_pid_set_comm_operations = { .open = comm_open, .read = seq_read, .write = comm_write, .llseek = seq_lseek, .release = single_release,};
static int proc_exe_link(struct dentry *dentry, struct path *exe_path, struct task_struct *task){ struct file *exe_file;
exe_file = get_task_exe_file(task); if (exe_file) { *exe_path = exe_file->f_path; path_get(&exe_file->f_path); fput(exe_file); return 0; } else return -ENOENT;}
static int call_proc_get_link(struct dentry *dentry, struct inode *inode, struct path *path_out){ struct task_struct *task; int ret;
task = get_proc_task(inode); if (!task) return -ENOENT; ret = down_read_killable(&task->signal->exec_update_lock); if (ret) goto out_put_task; if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { ret = -EACCES; goto out; } ret = PROC_I(inode)->op.proc_get_link(dentry, path_out, task);
out: up_read(&task->signal->exec_update_lock);out_put_task: put_task_struct(task); return ret;}
static const char *proc_pid_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done){ struct path path; int error;
if (!dentry) return ERR_PTR(-ECHILD); error = call_proc_get_link(dentry, inode, &path); if (!error) error = nd_jump_link(&path); return ERR_PTR(error);}
static int do_proc_readlink(const struct path *path, char __user *buffer, int buflen){ char *tmp = kmalloc(PATH_MAX, GFP_KERNEL); char *pathname; int len;
if (!tmp) return -ENOMEM;
pathname = d_path(path, tmp, PATH_MAX); len = PTR_ERR(pathname); if (IS_ERR(pathname)) goto out; len = tmp + PATH_MAX - 1 - pathname;
if (len > buflen) len = buflen; if (copy_to_user(buffer, pathname, len)) len = -EFAULT; out: kfree(tmp); return len;}
static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen){ int error = -EACCES; struct inode *inode = d_inode(dentry); struct path path;
error = call_proc_get_link(dentry, inode, &path); if (!error) { error = do_proc_readlink(&path, buffer, buflen); path_put(&path); } return error;}
const struct inode_operations proc_pid_link_inode_operations = { .readlink = proc_pid_readlink, .get_link = proc_pid_get_link, .setattr = proc_nochmod_setattr,};
/* building an inode */
void task_dump_owner(struct task_struct *task, umode_t mode, kuid_t *ruid, kgid_t *rgid){ /* Depending on the state of dumpable compute who should own a * proc file for a task. */ const struct cred *cred; kuid_t uid; kgid_t gid;
if (unlikely(task->flags & PF_KTHREAD)) { *ruid = GLOBAL_ROOT_UID; *rgid = GLOBAL_ROOT_GID; return; }
/* Default to the tasks effective ownership */ rcu_read_lock(); cred = __task_cred(task); uid = cred->euid; gid = cred->egid;
/* * Before the /proc/pid/status file was created the only way to read * the effective uid of a /process was to stat /proc/pid. Reading * /proc/pid/status is slow enough that procps and other packages * kept stating /proc/pid. To keep the rules in /proc simple I have * made this apply to all per process world readable and executable * directories. */ if (mode != (S_IFDIR | S_IRUGO | S_IXUGO)) { struct task_exec_state *exec_state;
exec_state = task_exec_state_rcu(task); if (READ_ONCE(exec_state->dumpable) != TASK_DUMPABLE_OWNER) { uid = make_kuid(exec_state->user_ns, 0); if (!uid_valid(uid)) uid = GLOBAL_ROOT_UID;
gid = make_kgid(exec_state->user_ns, 0); if (!gid_valid(gid)) gid = GLOBAL_ROOT_GID; } } rcu_read_unlock();
*ruid = uid; *rgid = gid;}
void proc_pid_evict_inode(struct proc_inode *ei){ struct pid *pid = ei->pid;
if (S_ISDIR(ei->vfs_inode.i_mode)) { spin_lock(&pid->lock); hlist_del_init_rcu(&ei->sibling_inodes); spin_unlock(&pid->lock); }}
struct inode *proc_pid_make_inode(struct super_block *sb, struct task_struct *task, umode_t mode){ struct inode * inode; struct proc_inode *ei; struct pid *pid;
/* We need a new inode */
inode = new_inode(sb); if (!inode) goto out;
/* Common stuff */ ei = PROC_I(inode); inode->i_mode = mode; inode->i_ino = get_next_ino(); simple_inode_init_ts(inode); inode->i_op = &proc_def_inode_operations;
/* * grab the reference to task. */ pid = get_task_pid(task, PIDTYPE_PID); if (!pid) goto out_unlock;
/* Let the pid remember us for quick removal */ ei->pid = pid;
task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid); security_task_to_inode(task, inode);
out: return inode;
out_unlock: iput(inode); return NULL;}
/* * Generating an inode and adding it into @pid->inodes, so that task will * invalidate inode's dentry before being released. * * This helper is used for creating dir-type entries under '/proc' and * '/proc/<tgid>/task'. Other entries(eg. fd, stat) under '/proc/<tgid>' * can be released by invalidating '/proc/<tgid>' dentry. * In theory, dentries under '/proc/<tgid>/task' can also be released by * invalidating '/proc/<tgid>' dentry, we reserve it to handle single * thread exiting situation: Any one of threads should invalidate its * '/proc/<tgid>/task/<pid>' dentry before released. */static struct inode *proc_pid_make_base_inode(struct super_block *sb, struct task_struct *task, umode_t mode){ struct inode *inode; struct proc_inode *ei; struct pid *pid;
inode = proc_pid_make_inode(sb, task, mode); if (!inode) return NULL;
/* Let proc_flush_pid find this directory inode */ ei = PROC_I(inode); pid = ei->pid; spin_lock(&pid->lock); hlist_add_head_rcu(&ei->sibling_inodes, &pid->inodes); spin_unlock(&pid->lock);
return inode;}
int pid_getattr(const struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags){ struct inode *inode = d_inode(path->dentry); struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb); struct task_struct *task;
generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
stat->uid = GLOBAL_ROOT_UID; stat->gid = GLOBAL_ROOT_GID; rcu_read_lock(); task = pid_task(proc_pid(inode), PIDTYPE_PID); if (task) { if (!has_pid_permissions(fs_info, task, HIDEPID_INVISIBLE)) { rcu_read_unlock(); /* * This doesn't prevent learning whether PID exists, * it only makes getattr() consistent with readdir(). */ return -ENOENT; } task_dump_owner(task, inode->i_mode, &stat->uid, &stat->gid); } rcu_read_unlock(); return 0;}
/* dentry stuff */
/* * Set <pid>/... inode ownership (can change due to setuid(), etc.) */void pid_update_inode(struct task_struct *task, struct inode *inode){ task_dump_owner(task, inode->i_mode, &inode->i_uid, &inode->i_gid);
inode->i_mode &= ~(S_ISUID | S_ISGID); security_task_to_inode(task, inode);}
/* * Rewrite the inode's ownerships here because the owning task may have * performed a setuid(), etc. * */static int pid_revalidate(struct inode *dir, const struct qstr *name, struct dentry *dentry, unsigned int flags){ struct inode *inode; struct task_struct *task; int ret = 0;
rcu_read_lock(); inode = d_inode_rcu(dentry); if (!inode) goto out; task = pid_task(proc_pid(inode), PIDTYPE_PID);
if (task) { pid_update_inode(task, inode); ret = 1; }out: rcu_read_unlock(); return ret;}
static inline bool proc_inode_is_dead(struct inode *inode){ return !proc_pid(inode)->tasks[PIDTYPE_PID].first;}
int pid_delete_dentry(const struct dentry *dentry){ /* Is the task we represent dead? * If so, then don't put the dentry on the lru list, * kill it immediately. */ return proc_inode_is_dead(d_inode(dentry));}
const struct dentry_operations pid_dentry_operations ={ .d_revalidate = pid_revalidate, .d_delete = pid_delete_dentry,};
/* Lookups */
/* * Fill a directory entry. * * If possible create the dcache entry and derive our inode number and * file type from dcache entry. * * Since all of the proc inode numbers are dynamically generated, the inode * numbers do not exist until the inode is cache. This means creating * the dcache entry in readdir is necessary to keep the inode numbers * reported by readdir in sync with the inode numbers reported * by stat. */bool proc_fill_cache(struct file *file, struct dir_context *ctx, const char *name, unsigned int len, instantiate_t instantiate, struct task_struct *task, const void *ptr){ struct dentry *child, *dir = file->f_path.dentry; struct qstr qname = QSTR_INIT(name, len); struct inode *inode; unsigned type = DT_UNKNOWN; ino_t ino = 1;
child = try_lookup_noperm(&qname, dir); if (IS_ERR(child)) goto end_instantiate;
if (!child) { child = d_alloc_parallel(dir, &qname); if (IS_ERR(child)) goto end_instantiate; if (d_in_lookup(child)) { struct dentry *res; res = instantiate(child, task, ptr); d_lookup_done(child); if (unlikely(res)) { dput(child); child = res; if (IS_ERR(child)) goto end_instantiate; } } } inode = d_inode(child); ino = inode->i_ino; type = inode->i_mode >> 12; dput(child);end_instantiate: return dir_emit(ctx, name, len, ino, type);}
/* * dname_to_vma_addr - maps a dentry name into two unsigned longs * which represent vma start and end addresses. */static int dname_to_vma_addr(struct dentry *dentry, unsigned long *start, unsigned long *end){ const char *str = dentry->d_name.name; unsigned long long sval, eval; unsigned int len;
if (str[0] == '0' && str[1] != '-') return -EINVAL; len = _parse_integer(str, 16, &sval); if (len & KSTRTOX_OVERFLOW) return -EINVAL; if (sval != (unsigned long)sval) return -EINVAL; str += len;
if (*str != '-') return -EINVAL; str++;
if (str[0] == '0' && str[1]) return -EINVAL; len = _parse_integer(str, 16, &eval); if (len & KSTRTOX_OVERFLOW) return -EINVAL; if (eval != (unsigned long)eval) return -EINVAL; str += len;
if (*str != '\0') return -EINVAL;
*start = sval; *end = eval;
return 0;}
static int map_files_d_revalidate(struct inode *dir, const struct qstr *name, struct dentry *dentry, unsigned int flags){ unsigned long vm_start, vm_end; bool exact_vma_exists = false; struct mm_struct *mm = NULL; struct task_struct *task; struct inode *inode; int status = 0;
if (flags & LOOKUP_RCU) return -ECHILD;
inode = d_inode(dentry); task = get_proc_task(inode); if (!task) goto out_notask;
mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); if (IS_ERR(mm)) goto out;
if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { status = mmap_read_lock_killable(mm); if (!status) { exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); mmap_read_unlock(mm); } }
mmput(mm);
if (exact_vma_exists) { task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);
security_task_to_inode(task, inode); status = 1; }
out: put_task_struct(task);
out_notask: return status;}
static const struct dentry_operations tid_map_files_dentry_operations = { .d_revalidate = map_files_d_revalidate, .d_delete = pid_delete_dentry,};
static int map_files_get_link(struct dentry *dentry, struct path *path, struct task_struct *task){ unsigned long vm_start, vm_end; struct vm_area_struct *vma; struct mm_struct *mm; int rc;
rc = -ENOENT; mm = get_task_mm(task); if (!mm) goto out;
rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); if (rc) goto out_mmput;
rc = mmap_read_lock_killable(mm); if (rc) goto out_mmput;
rc = -ENOENT; vma = find_exact_vma(mm, vm_start, vm_end); if (vma && vma->vm_file) { *path = *file_user_path(vma->vm_file); path_get(path); rc = 0; } mmap_read_unlock(mm);
out_mmput: mmput(mm);out: return rc;}
struct map_files_info { unsigned long start; unsigned long end; fmode_t mode;};
/* * Only allow CAP_SYS_ADMIN and CAP_CHECKPOINT_RESTORE to follow the links, due * to concerns about how the symlinks may be used to bypass permissions on * ancestor directories in the path to the file in question. */static const char *proc_map_files_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done){ if (!checkpoint_restore_ns_capable(&init_user_ns)) return ERR_PTR(-EPERM);
return proc_pid_get_link(dentry, inode, done);}
/* * Identical to proc_pid_link_inode_operations except for get_link() */static const struct inode_operations proc_map_files_link_inode_operations = { .readlink = proc_pid_readlink, .get_link = proc_map_files_get_link, .setattr = proc_nochmod_setattr,};
static struct dentry *proc_map_files_instantiate(struct dentry *dentry, struct task_struct *task, const void *ptr){ fmode_t mode = (fmode_t)(unsigned long)ptr; struct proc_inode *ei; struct inode *inode;
inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK | ((mode & FMODE_READ ) ? S_IRUSR : 0) | ((mode & FMODE_WRITE) ? S_IWUSR : 0)); if (!inode) return ERR_PTR(-ENOENT);
ei = PROC_I(inode); ei->op.proc_get_link = map_files_get_link;
inode->i_op = &proc_map_files_link_inode_operations; inode->i_size = 64;
return proc_splice_unmountable(inode, dentry, &tid_map_files_dentry_operations);}
static struct dentry *proc_map_files_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags){ unsigned long vm_start, vm_end; struct vm_area_struct *vma; struct task_struct *task; struct dentry *result; struct mm_struct *mm;
result = ERR_PTR(-ENOENT); task = get_proc_task(dir); if (!task) goto out;
result = ERR_PTR(-ENOENT); if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) goto out_put_task;
mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); if (IS_ERR(mm)) { result = ERR_CAST(mm); goto out_put_task; }
result = ERR_PTR(-EINTR); if (mmap_read_lock_killable(mm)) goto out_put_mm;
result = ERR_PTR(-ENOENT); vma = find_exact_vma(mm, vm_start, vm_end); if (!vma) goto out_no_vma;
if (vma->vm_file) result = proc_map_files_instantiate(dentry, task, (void *)(unsigned long)vma->vm_file->f_mode);
out_no_vma: mmap_read_unlock(mm);out_put_mm: mmput(mm);out_put_task: put_task_struct(task);out: return result;}
static const struct inode_operations proc_map_files_inode_operations = { .lookup = proc_map_files_lookup, .permission = proc_fd_permission, .setattr = proc_nochmod_setattr,};
static intproc_map_files_readdir(struct file *file, struct dir_context *ctx){ struct vm_area_struct *vma; struct task_struct *task; struct mm_struct *mm; unsigned long nr_files, pos, i; GENRADIX(struct map_files_info) fa; struct map_files_info *p; int ret; struct vma_iterator vmi;
genradix_init(&fa);
ret = -ENOENT; task = get_proc_task(file_inode(file)); if (!task) goto out;
ret = 0; if (!dir_emit_dots(file, ctx)) goto out_put_task;
mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); if (IS_ERR(mm)) { ret = PTR_ERR(mm); /* if the task has no mm, the directory should just be empty */ if (ret == -ESRCH) ret = 0; goto out_put_task; }
ret = mmap_read_lock_killable(mm); if (ret) goto out_put_mm;
nr_files = 0;
/* * We need two passes here: * * 1) Collect vmas of mapped files with mmap_lock taken * 2) Release mmap_lock and instantiate entries * * otherwise we get lockdep complained, since filldir() * routine might require mmap_lock taken in might_fault(). */
pos = 2; vma_iter_init(&vmi, mm, 0); for_each_vma(vmi, vma) { if (!vma->vm_file) continue; if (++pos <= ctx->pos) continue;
p = genradix_ptr_alloc(&fa, nr_files++, GFP_KERNEL); if (!p) { ret = -ENOMEM; mmap_read_unlock(mm); goto out_put_mm; }
p->start = vma->vm_start; p->end = vma->vm_end; p->mode = vma->vm_file->f_mode; } mmap_read_unlock(mm);
for (i = 0; i < nr_files; i++) { char buf[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */ unsigned int len;
p = genradix_ptr(&fa, i); len = snprintf(buf, sizeof(buf), "%lx-%lx", p->start, p->end); if (!proc_fill_cache(file, ctx, buf, len, proc_map_files_instantiate, task, (void *)(unsigned long)p->mode)) break; ctx->pos++; }
out_put_mm: mmput(mm);out_put_task: put_task_struct(task);out: genradix_free(&fa); return ret;}
static const struct file_operations proc_map_files_operations = { .read = generic_read_dir, .iterate_shared = proc_map_files_readdir, .llseek = generic_file_llseek,};
#if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)struct timers_private { struct pid *pid; struct task_struct *task; struct pid_namespace *ns;};
static void *timers_start(struct seq_file *m, loff_t *pos){ struct timers_private *tp = m->private;
tp->task = get_pid_task(tp->pid, PIDTYPE_PID); if (!tp->task) return ERR_PTR(-ESRCH);
rcu_read_lock(); return seq_hlist_start_rcu(&tp->task->signal->posix_timers, *pos);}
static void *timers_next(struct seq_file *m, void *v, loff_t *pos){ struct timers_private *tp = m->private;
return seq_hlist_next_rcu(v, &tp->task->signal->posix_timers, pos);}
static void timers_stop(struct seq_file *m, void *v){ struct timers_private *tp = m->private;
if (tp->task) { put_task_struct(tp->task); tp->task = NULL; rcu_read_unlock(); }}
static int show_timer(struct seq_file *m, void *v){ static const char * const nstr[] = { [SIGEV_SIGNAL] = "signal", [SIGEV_NONE] = "none", [SIGEV_THREAD] = "thread", };
struct k_itimer *timer = hlist_entry((struct hlist_node *)v, struct k_itimer, list); struct timers_private *tp = m->private; int notify = timer->it_sigev_notify; pid_t nr = 0;
guard(spinlock_irq)(&timer->it_lock); if (!posixtimer_valid(timer)) return 0;
if (timer->it_pid && pid_has_task(timer->it_pid, timer->it_pid_type)) nr = pid_nr_ns(timer->it_pid, tp->ns); else notify = SIGEV_NONE;
seq_printf(m, "ID: %d\n", timer->it_id); seq_printf(m, "signal: %d/%px\n", timer->sigq.info.si_signo, timer->sigq.info.si_value.sival_ptr); seq_printf(m, "notify: %s/%s.%d\n", nstr[notify & ~SIGEV_THREAD_ID], (notify & SIGEV_THREAD_ID) ? "tid" : "pid", nr); seq_printf(m, "ClockID: %d\n", timer->it_clock);
return 0;}
static const struct seq_operations proc_timers_seq_ops = { .start = timers_start, .next = timers_next, .stop = timers_stop, .show = show_timer,};
static int proc_timers_open(struct inode *inode, struct file *file){ struct timers_private *tp;
tp = __seq_open_private(file, &proc_timers_seq_ops, sizeof(struct timers_private)); if (!tp) return -ENOMEM;
tp->pid = proc_pid(inode); tp->ns = proc_pid_ns(inode->i_sb); return 0;}
static const struct file_operations proc_timers_operations = { .open = proc_timers_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private,};#endif
static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, size_t count, loff_t *offset){ struct inode *inode = file_inode(file); struct task_struct *p; u64 slack_ns; int err;
err = kstrtoull_from_user(buf, count, 10, &slack_ns); if (err < 0) return err;
p = get_proc_task(inode); if (!p) return -ESRCH;
if (p != current) { rcu_read_lock(); if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) { rcu_read_unlock(); count = -EPERM; goto out; } rcu_read_unlock();
err = security_task_setscheduler(p); if (err) { count = err; goto out; } }
task_lock(p); if (rt_or_dl_task_policy(p)) slack_ns = 0; else if (slack_ns == 0) slack_ns = p->default_timer_slack_ns; p->timer_slack_ns = slack_ns; task_unlock(p);
out: put_task_struct(p);
return count;}
static int timerslack_ns_show(struct seq_file *m, void *v){ struct inode *inode = m->private; struct task_struct *p; int err = 0;
p = get_proc_task(inode); if (!p) return -ESRCH;
if (p != current) { rcu_read_lock(); if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) { rcu_read_unlock(); err = -EPERM; goto out; } rcu_read_unlock();
err = security_task_getscheduler(p); if (err) goto out; }
task_lock(p); seq_printf(m, "%llu\n", p->timer_slack_ns); task_unlock(p);
out: put_task_struct(p);
return err;}
static int timerslack_ns_open(struct inode *inode, struct file *filp){ return single_open(filp, timerslack_ns_show, inode);}
static const struct file_operations proc_pid_set_timerslack_ns_operations = { .open = timerslack_ns_open, .read = seq_read, .write = timerslack_ns_write, .llseek = seq_lseek, .release = single_release,};
static struct dentry *proc_pident_instantiate(struct dentry *dentry, struct task_struct *task, const void *ptr){ const struct pid_entry *p = ptr; struct inode *inode; struct proc_inode *ei;
inode = proc_pid_make_inode(dentry->d_sb, task, p->mode); if (!inode) return ERR_PTR(-ENOENT);
ei = PROC_I(inode); if (S_ISDIR(inode->i_mode)) set_nlink(inode, 2); /* Use getattr to fix if necessary */ if (p->iop) inode->i_op = p->iop; if (p->fop) inode->i_fop = p->fop; ei->op = p->op; pid_update_inode(task, inode); return d_splice_alias_ops(inode, dentry, &pid_dentry_operations);}
static struct dentry *proc_pident_lookup(struct inode *dir, struct dentry *dentry, const struct pid_entry *p, const struct pid_entry *end){ struct task_struct *task = get_proc_task(dir); struct dentry *res = ERR_PTR(-ENOENT);
if (!task) goto out_no_task;
/* * Yes, it does not scale. And it should not. Don't add * new entries into /proc/<tgid>/ without very good reasons. */ for (; p < end; p++) { if (p->len != dentry->d_name.len) continue; if (!memcmp(dentry->d_name.name, p->name, p->len)) { res = proc_pident_instantiate(dentry, task, p); break; } } put_task_struct(task);out_no_task: return res;}
static int proc_pident_readdir(struct file *file, struct dir_context *ctx, const struct pid_entry *ents, unsigned int nents){ struct task_struct *task = get_proc_task(file_inode(file)); const struct pid_entry *p;
if (!task) return -ENOENT;
if (!dir_emit_dots(file, ctx)) goto out;
if (ctx->pos >= nents + 2) goto out;
for (p = ents + (ctx->pos - 2); p < ents + nents; p++) { if (!proc_fill_cache(file, ctx, p->name, p->len, proc_pident_instantiate, task, p)) break; ctx->pos++; }out: put_task_struct(task); return 0;}
#ifdef CONFIG_SECURITYstatic int proc_pid_attr_open(struct inode *inode, struct file *file){ file->private_data = NULL; __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); return 0;}
static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, size_t count, loff_t *ppos){ struct inode * inode = file_inode(file); char *p = NULL; ssize_t length; struct task_struct *task = get_proc_task(inode);
if (!task) return -ESRCH;
length = security_getprocattr(task, PROC_I(inode)->op.lsmid, file->f_path.dentry->d_name.name, &p); put_task_struct(task); if (length > 0) length = simple_read_from_buffer(buf, count, ppos, p, length); kfree(p); return length;}
static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos){ struct inode * inode = file_inode(file); struct task_struct *task; void *page; int rv;
/* A task may only write when it was the opener. */ if (file->private_data != current->mm) return -EPERM;
rcu_read_lock(); task = pid_task(proc_pid(inode), PIDTYPE_PID); if (!task) { rcu_read_unlock(); return -ESRCH; } /* A task may only write its own attributes. */ if (current != task) { rcu_read_unlock(); return -EACCES; } /* Prevent changes to overridden credentials. */ if (current_cred() != current_real_cred()) { rcu_read_unlock(); return -EBUSY; } rcu_read_unlock();
if (count > PAGE_SIZE) count = PAGE_SIZE;
/* No partial writes. */ if (*ppos != 0) return -EINVAL;
page = memdup_user(buf, count); if (IS_ERR(page)) { rv = PTR_ERR(page); goto out; }
/* Guard against adverse ptrace interaction */ rv = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); if (rv < 0) goto out_free;
rv = security_setprocattr(PROC_I(inode)->op.lsmid, file->f_path.dentry->d_name.name, page, count); mutex_unlock(¤t->signal->cred_guard_mutex);out_free: kfree(page);out: return rv;}
static const struct file_operations proc_pid_attr_operations = { .open = proc_pid_attr_open, .read = proc_pid_attr_read, .write = proc_pid_attr_write, .llseek = generic_file_llseek, .release = mem_release,};
#define LSM_DIR_OPS(LSM) \static int proc_##LSM##_attr_dir_iterate(struct file *filp, \ struct dir_context *ctx) \{ \ return proc_pident_readdir(filp, ctx, \ LSM##_attr_dir_stuff, \ ARRAY_SIZE(LSM##_attr_dir_stuff)); \} \\static const struct file_operations proc_##LSM##_attr_dir_ops = { \ .read = generic_read_dir, \ .iterate_shared = proc_##LSM##_attr_dir_iterate, \ .llseek = default_llseek, \}; \\static struct dentry *proc_##LSM##_attr_dir_lookup(struct inode *dir, \ struct dentry *dentry, unsigned int flags) \{ \ return proc_pident_lookup(dir, dentry, \ LSM##_attr_dir_stuff, \ LSM##_attr_dir_stuff + ARRAY_SIZE(LSM##_attr_dir_stuff)); \} \\static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \ .lookup = proc_##LSM##_attr_dir_lookup, \ .getattr = pid_getattr, \ .setattr = proc_nochmod_setattr, \}
#ifdef CONFIG_SECURITY_SMACKstatic const struct pid_entry smack_attr_dir_stuff[] = { ATTR(LSM_ID_SMACK, "current", 0666),};LSM_DIR_OPS(smack);#endif
#ifdef CONFIG_SECURITY_APPARMORstatic const struct pid_entry apparmor_attr_dir_stuff[] = { ATTR(LSM_ID_APPARMOR, "current", 0666), ATTR(LSM_ID_APPARMOR, "prev", 0444), ATTR(LSM_ID_APPARMOR, "exec", 0666),};LSM_DIR_OPS(apparmor);#endif
static const struct pid_entry attr_dir_stuff[] = { ATTR(LSM_ID_UNDEF, "current", 0666), ATTR(LSM_ID_UNDEF, "prev", 0444), ATTR(LSM_ID_UNDEF, "exec", 0666), ATTR(LSM_ID_UNDEF, "fscreate", 0666), ATTR(LSM_ID_UNDEF, "keycreate", 0666), ATTR(LSM_ID_UNDEF, "sockcreate", 0666),#ifdef CONFIG_SECURITY_SMACK DIR("smack", 0555, proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),#endif#ifdef CONFIG_SECURITY_APPARMOR DIR("apparmor", 0555, proc_apparmor_attr_dir_inode_ops, proc_apparmor_attr_dir_ops),#endif};
static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx){ return proc_pident_readdir(file, ctx, attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));}
static const struct file_operations proc_attr_dir_operations = { .read = generic_read_dir, .iterate_shared = proc_attr_dir_readdir, .llseek = generic_file_llseek,};
static struct dentry *proc_attr_dir_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags){ return proc_pident_lookup(dir, dentry, attr_dir_stuff, attr_dir_stuff + ARRAY_SIZE(attr_dir_stuff));}
static const struct inode_operations proc_attr_dir_inode_operations = { .lookup = proc_attr_dir_lookup, .getattr = pid_getattr, .setattr = proc_nochmod_setattr,};
#endif
#ifdef CONFIG_ELF_COREstatic ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, size_t count, loff_t *ppos){ struct task_struct *task = get_proc_task(file_inode(file)); struct mm_struct *mm; char buffer[PROC_NUMBUF]; size_t len; int ret;
if (!task) return -ESRCH;
ret = 0; mm = get_task_mm(task); if (mm) { unsigned long flags = __mm_flags_get_word(mm);
len = snprintf(buffer, sizeof(buffer), "%08lx\n", ((flags & MMF_DUMP_FILTER_MASK) >> MMF_DUMP_FILTER_SHIFT)); mmput(mm); ret = simple_read_from_buffer(buf, count, ppos, buffer, len); }
put_task_struct(task);
return ret;}
static ssize_t proc_coredump_filter_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos){ struct task_struct *task; struct mm_struct *mm; unsigned int val; int ret; int i; unsigned long mask;
ret = kstrtouint_from_user(buf, count, 0, &val); if (ret < 0) return ret;
ret = -ESRCH; task = get_proc_task(file_inode(file)); if (!task) goto out_no_task;
mm = get_task_mm(task); if (!mm) goto out_no_mm; ret = 0;
for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { if (val & mask) mm_flags_set(i + MMF_DUMP_FILTER_SHIFT, mm); else mm_flags_clear(i + MMF_DUMP_FILTER_SHIFT, mm); }
mmput(mm); out_no_mm: put_task_struct(task); out_no_task: if (ret < 0) return ret; return count;}
static const struct file_operations proc_coredump_filter_operations = { .read = proc_coredump_filter_read, .write = proc_coredump_filter_write, .llseek = generic_file_llseek,};#endif
#ifdef CONFIG_TASK_IO_ACCOUNTINGstatic int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole){ struct task_io_accounting acct; int result;
result = down_read_killable(&task->signal->exec_update_lock); if (result) return result;
if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { result = -EACCES; goto out_unlock; }
if (whole) { struct signal_struct *sig = task->signal; struct task_struct *t;
guard(rcu)(); scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) { acct = sig->ioac; __for_each_thread(sig, t) task_io_accounting_add(&acct, &t->ioac);
} } else { acct = task->ioac; }
seq_printf(m, "rchar: %llu\n" "wchar: %llu\n" "syscr: %llu\n" "syscw: %llu\n" "read_bytes: %llu\n" "write_bytes: %llu\n" "cancelled_write_bytes: %llu\n", (unsigned long long)acct.rchar, (unsigned long long)acct.wchar, (unsigned long long)acct.syscr, (unsigned long long)acct.syscw, (unsigned long long)acct.read_bytes, (unsigned long long)acct.write_bytes, (unsigned long long)acct.cancelled_write_bytes); result = 0;
out_unlock: up_read(&task->signal->exec_update_lock); return result;}
static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ return do_io_accounting(task, m, 0);}
static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ return do_io_accounting(task, m, 1);}#endif /* CONFIG_TASK_IO_ACCOUNTING */
#ifdef CONFIG_USER_NSstatic int proc_id_map_open(struct inode *inode, struct file *file, const struct seq_operations *seq_ops){ struct user_namespace *ns = NULL; struct task_struct *task; struct seq_file *seq; int ret = -EINVAL;
task = get_proc_task(inode); if (task) { rcu_read_lock(); ns = get_user_ns(task_cred_xxx(task, user_ns)); rcu_read_unlock(); put_task_struct(task); } if (!ns) goto err;
ret = seq_open(file, seq_ops); if (ret) goto err_put_ns;
seq = file->private_data; seq->private = ns;
return 0;err_put_ns: put_user_ns(ns);err: return ret;}
static int proc_id_map_release(struct inode *inode, struct file *file){ struct seq_file *seq = file->private_data; struct user_namespace *ns = seq->private; put_user_ns(ns); return seq_release(inode, file);}
static int proc_uid_map_open(struct inode *inode, struct file *file){ return proc_id_map_open(inode, file, &proc_uid_seq_operations);}
static int proc_gid_map_open(struct inode *inode, struct file *file){ return proc_id_map_open(inode, file, &proc_gid_seq_operations);}
static int proc_projid_map_open(struct inode *inode, struct file *file){ return proc_id_map_open(inode, file, &proc_projid_seq_operations);}
static const struct file_operations proc_uid_map_operations = { .open = proc_uid_map_open, .write = proc_uid_map_write, .read = seq_read, .llseek = seq_lseek, .release = proc_id_map_release,};
static const struct file_operations proc_gid_map_operations = { .open = proc_gid_map_open, .write = proc_gid_map_write, .read = seq_read, .llseek = seq_lseek, .release = proc_id_map_release,};
static const struct file_operations proc_projid_map_operations = { .open = proc_projid_map_open, .write = proc_projid_map_write, .read = seq_read, .llseek = seq_lseek, .release = proc_id_map_release,};
static int proc_setgroups_open(struct inode *inode, struct file *file){ struct user_namespace *ns = NULL; struct task_struct *task; int ret;
ret = -ESRCH; task = get_proc_task(inode); if (task) { rcu_read_lock(); ns = get_user_ns(task_cred_xxx(task, user_ns)); rcu_read_unlock(); put_task_struct(task); } if (!ns) goto err;
if (file->f_mode & FMODE_WRITE) { ret = -EACCES; if (!ns_capable(ns, CAP_SYS_ADMIN)) goto err_put_ns; }
ret = single_open(file, &proc_setgroups_show, ns); if (ret) goto err_put_ns;
return 0;err_put_ns: put_user_ns(ns);err: return ret;}
static int proc_setgroups_release(struct inode *inode, struct file *file){ struct seq_file *seq = file->private_data; struct user_namespace *ns = seq->private; int ret = single_release(inode, file); put_user_ns(ns); return ret;}
static const struct file_operations proc_setgroups_operations = { .open = proc_setgroups_open, .write = proc_setgroups_write, .read = seq_read, .llseek = seq_lseek, .release = proc_setgroups_release,};#endif /* CONFIG_USER_NS */
static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ int err = lock_trace(task); if (!err) { seq_printf(m, "%08x\n", task->personality); unlock_trace(task); } return err;}
#ifdef CONFIG_LIVEPATCHstatic int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ seq_printf(m, "%d\n", task->patch_state); return 0;}#endif /* CONFIG_LIVEPATCH */
#ifdef CONFIG_KSMstatic int proc_pid_ksm_merging_pages(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ struct mm_struct *mm;
mm = get_task_mm(task); if (mm) { seq_printf(m, "%lu\n", mm->ksm_merging_pages); mmput(mm); }
return 0;}static int proc_pid_ksm_stat(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ struct mm_struct *mm; int ret = 0;
mm = get_task_mm(task); if (mm) { seq_printf(m, "ksm_rmap_items %lu\n", mm->ksm_rmap_items); seq_printf(m, "ksm_zero_pages %ld\n", mm_ksm_zero_pages(mm)); seq_printf(m, "ksm_merging_pages %lu\n", mm->ksm_merging_pages); seq_printf(m, "ksm_process_profit %ld\n", ksm_process_profit(mm)); seq_printf(m, "ksm_merge_any: %s\n", mm_flags_test(MMF_VM_MERGE_ANY, mm) ? "yes" : "no"); ret = mmap_read_lock_killable(mm); if (ret) { mmput(mm); return ret; } seq_printf(m, "ksm_mergeable: %s\n", ksm_process_mergeable(mm) ? "yes" : "no"); mmap_read_unlock(mm); mmput(mm); }
return 0;}#endif /* CONFIG_KSM */
#ifdef CONFIG_KSTACK_ERASE_METRICSstatic int proc_stack_depth(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task){ unsigned long prev_depth = THREAD_SIZE - (task->prev_lowest_stack & (THREAD_SIZE - 1)); unsigned long depth = THREAD_SIZE - (task->lowest_stack & (THREAD_SIZE - 1));
seq_printf(m, "previous stack depth: %lu\nstack depth: %lu\n", prev_depth, depth); return 0;}#endif /* CONFIG_KSTACK_ERASE_METRICS */
/* * Thread groups */static const struct file_operations proc_task_operations;static const struct inode_operations proc_task_inode_operations;
static const struct pid_entry tgid_base_stuff[] = { DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), DIR("fdinfo", S_IRUGO|S_IXUGO, proc_fdinfo_inode_operations, proc_fdinfo_operations), DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),#ifdef CONFIG_NET DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),#endif REG("environ", S_IRUSR, proc_environ_operations), REG("auxv", S_IRUSR, proc_auxv_operations), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), ONE("limits", S_IRUGO, proc_pid_limits), REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),#ifdef CONFIG_SCHED_AUTOGROUP REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),#endif#ifdef CONFIG_TIME_NS REG("timens_offsets", S_IRUGO|S_IWUSR, proc_timens_offsets_operations),#endif REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),#ifdef CONFIG_HAVE_ARCH_TRACEHOOK ONE("syscall", S_IRUSR, proc_pid_syscall),#endif REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), ONE("stat", S_IRUGO, proc_tgid_stat), ONE("statm", S_IRUGO, proc_pid_statm), REG("maps", S_IRUGO, proc_pid_maps_operations),#ifdef CONFIG_NUMA REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),#endif REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), LNK("cwd", proc_cwd_link), LNK("root", proc_root_link), LNK("exe", proc_exe_link), REG("mounts", S_IRUGO, proc_mounts_operations), REG("mountinfo", S_IRUGO, proc_mountinfo_operations), REG("mountstats", S_IRUSR, proc_mountstats_operations),#ifdef CONFIG_PROC_PAGE_MONITOR REG("clear_refs", S_IWUSR, proc_clear_refs_operations), REG("smaps", S_IRUGO, proc_pid_smaps_operations), REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations), REG("pagemap", S_IRUSR, proc_pagemap_operations),#endif#ifdef CONFIG_SECURITY DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),#endif#ifdef CONFIG_KALLSYMS ONE("wchan", S_IRUGO, proc_pid_wchan),#endif#ifdef CONFIG_STACKTRACE ONE("stack", S_IRUSR, proc_pid_stack),#endif#ifdef CONFIG_SCHED_INFO ONE("schedstat", S_IRUGO, proc_pid_schedstat),#endif#ifdef CONFIG_LATENCYTOP REG("latency", S_IRUGO, proc_lstats_operations),#endif#ifdef CONFIG_PROC_PID_CPUSET ONE("cpuset", S_IRUGO, proc_cpuset_show),#endif#ifdef CONFIG_CGROUPS ONE("cgroup", S_IRUGO, proc_cgroup_show),#endif#ifdef CONFIG_PROC_CPU_RESCTRL ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show),#endif ONE("oom_score", S_IRUGO, proc_oom_score), REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),#ifdef CONFIG_AUDIT REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), REG("sessionid", S_IRUGO, proc_sessionid_operations),#endif#ifdef CONFIG_FAULT_INJECTION REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), REG("fail-nth", 0644, proc_fail_nth_operations),#endif#ifdef CONFIG_ELF_CORE REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),#endif#ifdef CONFIG_TASK_IO_ACCOUNTING ONE("io", S_IRUSR, proc_tgid_io_accounting),#endif#ifdef CONFIG_USER_NS REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),#endif#if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS) REG("timers", S_IRUGO, proc_timers_operations),#endif REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations),#ifdef CONFIG_LIVEPATCH ONE("patch_state", S_IRUSR, proc_pid_patch_state),#endif#ifdef CONFIG_KSTACK_ERASE_METRICS ONE("stack_depth", S_IRUGO, proc_stack_depth),#endif#ifdef CONFIG_PROC_PID_ARCH_STATUS ONE("arch_status", S_IRUGO, proc_pid_arch_status),#endif#ifdef CONFIG_SECCOMP_CACHE_DEBUG ONE("seccomp_cache", S_IRUSR, proc_pid_seccomp_cache),#endif#ifdef CONFIG_KSM ONE("ksm_merging_pages", S_IRUSR, proc_pid_ksm_merging_pages), ONE("ksm_stat", S_IRUSR, proc_pid_ksm_stat),#endif};
static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx){ return proc_pident_readdir(file, ctx, tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));}
static const struct file_operations proc_tgid_base_operations = { .read = generic_read_dir, .iterate_shared = proc_tgid_base_readdir, .llseek = generic_file_llseek,};
struct pid *tgid_pidfd_to_pid(const struct file *file){ if (file->f_op != &proc_tgid_base_operations) return ERR_PTR(-EBADF);
return proc_pid(file_inode(file));}
static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags){ return proc_pident_lookup(dir, dentry, tgid_base_stuff, tgid_base_stuff + ARRAY_SIZE(tgid_base_stuff));}
static const struct inode_operations proc_tgid_base_inode_operations = { .lookup = proc_tgid_base_lookup, .getattr = pid_getattr, .setattr = proc_nochmod_setattr, .permission = proc_pid_permission,};
/** * proc_flush_pid - Remove dcache entries for @pid from the /proc dcache. * @pid: pid that should be flushed. * * This function walks a list of inodes (that belong to any proc * filesystem) that are attached to the pid and flushes them from * the dentry cache. * * It is safe and reasonable to cache /proc entries for a task until * that task exits. After that they just clog up the dcache with * useless entries, possibly causing useful dcache entries to be * flushed instead. This routine is provided to flush those useless * dcache entries when a process is reaped. * * NOTE: This routine is just an optimization so it does not guarantee * that no dcache entries will exist after a process is reaped * it just makes it very unlikely that any will persist. */
void proc_flush_pid(struct pid *pid){ proc_invalidate_siblings_dcache(&pid->inodes, &pid->lock);}
static struct dentry *proc_pid_instantiate(struct dentry * dentry, struct task_struct *task, const void *ptr){ struct inode *inode;
inode = proc_pid_make_base_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) return ERR_PTR(-ENOENT);
inode->i_op = &proc_tgid_base_inode_operations; inode->i_fop = &proc_tgid_base_operations; inode->i_flags|=S_IMMUTABLE;
set_nlink(inode, nlink_tgid); pid_update_inode(task, inode);
return d_splice_alias_ops(inode, dentry, &pid_dentry_operations);}
struct dentry *proc_pid_lookup(struct dentry *dentry, unsigned int flags){ struct task_struct *task; unsigned tgid; struct proc_fs_info *fs_info; struct pid_namespace *ns; struct dentry *result = ERR_PTR(-ENOENT);
tgid = name_to_int(&dentry->d_name); if (tgid == ~0U) goto out;
fs_info = proc_sb_info(dentry->d_sb); ns = fs_info->pid_ns; rcu_read_lock(); task = find_task_by_pid_ns(tgid, ns); if (task) get_task_struct(task); rcu_read_unlock(); if (!task) goto out;
/* Limit procfs to only ptraceable tasks */ if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE) { if (!has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS)) goto out_put_task; }
result = proc_pid_instantiate(dentry, task, NULL);out_put_task: put_task_struct(task);out: return result;}
/* * Find the first task with tgid >= tgid * */struct tgid_iter { unsigned int tgid; struct task_struct *task; struct pid_namespace *const pid_ns;};
static struct tgid_itermake_tgid_iter(unsigned int init_tgid, struct pid_namespace *pid_ns){ return (struct tgid_iter){ .tgid = init_tgid - 1, .pid_ns = pid_ns, };}
static bool next_tgid(struct tgid_iter *it){ if (it->task) { put_task_struct(it->task); it->task = NULL; }
rcu_read_lock(); while (1) { it->tgid += 1; const auto pid = find_ge_pid(it->tgid, it->pid_ns); if (pid) { it->tgid = pid_nr_ns(pid, it->pid_ns); it->task = pid_task(pid, PIDTYPE_TGID); if (it->task) { get_task_struct(it->task); rcu_read_unlock(); return true; } } else { rcu_read_unlock(); return false; } }}
#define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
/* for the /proc/ directory itself, after non-process stuff has been done */int proc_pid_readdir(struct file *file, struct dir_context *ctx){ struct proc_fs_info *fs_info = proc_sb_info(file_inode(file)->i_sb); struct pid_namespace *pid_ns = proc_pid_ns(file_inode(file)->i_sb); loff_t pos = ctx->pos;
if (pos >= PID_MAX_LIMIT + TGID_OFFSET) return 0;
if (pos == TGID_OFFSET - 2) { if (!dir_emit(ctx, "self", 4, self_inum, DT_LNK)) return 0; ctx->pos = pos = pos + 1; } if (pos == TGID_OFFSET - 1) { if (!dir_emit(ctx, "thread-self", 11, thread_self_inum, DT_LNK)) return 0; ctx->pos = pos = pos + 1; }
auto iter = make_tgid_iter(pos - TGID_OFFSET, pid_ns); while (next_tgid(&iter)) { char name[10 + 1]; unsigned int len;
cond_resched(); if (!has_pid_permissions(fs_info, iter.task, HIDEPID_INVISIBLE)) continue;
len = snprintf(name, sizeof(name), "%u", iter.tgid); ctx->pos = iter.tgid + TGID_OFFSET; if (!proc_fill_cache(file, ctx, name, len, proc_pid_instantiate, iter.task, NULL)) { put_task_struct(iter.task); return 0; } } ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; return 0;}
/* * proc_tid_comm_permission is a special permission function exclusively * used for the node /proc/<pid>/task/<tid>/comm. * It bypasses generic permission checks in the case where a task of the same * task group attempts to access the node. * The rationale behind this is that glibc and bionic access this node for * cross thread naming (pthread_set/getname_np(!self)). However, if * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0, * which locks out the cross thread naming implementation. * This function makes sure that the node is always accessible for members of * same thread group. */static int proc_tid_comm_permission(const struct mnt_idmap *idmap, struct inode *inode, int mask){ bool is_same_tgroup; struct task_struct *task;
task = get_proc_task(inode); if (!task) return -ESRCH; is_same_tgroup = same_thread_group(current, task); put_task_struct(task);
if (likely(is_same_tgroup && !(mask & MAY_EXEC))) { /* This file (/proc/<pid>/task/<tid>/comm) can always be * read or written by the members of the corresponding * thread group. */ return 0; }
return generic_permission(&nop_mnt_idmap, inode, mask);}
static const struct inode_operations proc_tid_comm_inode_operations = { .setattr = proc_nochmod_setattr, .permission = proc_tid_comm_permission,};
/* * Tasks */static const struct pid_entry tid_base_stuff[] = { DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), DIR("fdinfo", S_IRUGO|S_IXUGO, proc_fdinfo_inode_operations, proc_fdinfo_operations), DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),#ifdef CONFIG_NET DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),#endif REG("environ", S_IRUSR, proc_environ_operations), REG("auxv", S_IRUSR, proc_auxv_operations), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), ONE("limits", S_IRUGO, proc_pid_limits), REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), NOD("comm", S_IFREG|S_IRUGO|S_IWUSR, &proc_tid_comm_inode_operations, &proc_pid_set_comm_operations, {}),#ifdef CONFIG_HAVE_ARCH_TRACEHOOK ONE("syscall", S_IRUSR, proc_pid_syscall),#endif REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), ONE("stat", S_IRUGO, proc_tid_stat), ONE("statm", S_IRUGO, proc_pid_statm), REG("maps", S_IRUGO, proc_pid_maps_operations),#ifdef CONFIG_PROC_CHILDREN REG("children", S_IRUGO, proc_tid_children_operations),#endif#ifdef CONFIG_NUMA REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),#endif REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), LNK("cwd", proc_cwd_link), LNK("root", proc_root_link), LNK("exe", proc_exe_link), REG("mounts", S_IRUGO, proc_mounts_operations), REG("mountinfo", S_IRUGO, proc_mountinfo_operations),#ifdef CONFIG_PROC_PAGE_MONITOR REG("clear_refs", S_IWUSR, proc_clear_refs_operations), REG("smaps", S_IRUGO, proc_pid_smaps_operations), REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations), REG("pagemap", S_IRUSR, proc_pagemap_operations),#endif#ifdef CONFIG_SECURITY DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),#endif#ifdef CONFIG_KALLSYMS ONE("wchan", S_IRUGO, proc_pid_wchan),#endif#ifdef CONFIG_STACKTRACE ONE("stack", S_IRUSR, proc_pid_stack),#endif#ifdef CONFIG_SCHED_INFO ONE("schedstat", S_IRUGO, proc_pid_schedstat),#endif#ifdef CONFIG_LATENCYTOP REG("latency", S_IRUGO, proc_lstats_operations),#endif#ifdef CONFIG_PROC_PID_CPUSET ONE("cpuset", S_IRUGO, proc_cpuset_show),#endif#ifdef CONFIG_CGROUPS ONE("cgroup", S_IRUGO, proc_cgroup_show),#endif#ifdef CONFIG_PROC_CPU_RESCTRL ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show),#endif ONE("oom_score", S_IRUGO, proc_oom_score), REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),#ifdef CONFIG_AUDIT REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), REG("sessionid", S_IRUGO, proc_sessionid_operations),#endif#ifdef CONFIG_FAULT_INJECTION REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), REG("fail-nth", 0644, proc_fail_nth_operations),#endif#ifdef CONFIG_TASK_IO_ACCOUNTING ONE("io", S_IRUSR, proc_tid_io_accounting),#endif#ifdef CONFIG_USER_NS REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),#endif#ifdef CONFIG_LIVEPATCH ONE("patch_state", S_IRUSR, proc_pid_patch_state),#endif#ifdef CONFIG_PROC_PID_ARCH_STATUS ONE("arch_status", S_IRUGO, proc_pid_arch_status),#endif#ifdef CONFIG_SECCOMP_CACHE_DEBUG ONE("seccomp_cache", S_IRUSR, proc_pid_seccomp_cache),#endif#ifdef CONFIG_KSM ONE("ksm_merging_pages", S_IRUSR, proc_pid_ksm_merging_pages), ONE("ksm_stat", S_IRUSR, proc_pid_ksm_stat),#endif};
static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx){ return proc_pident_readdir(file, ctx, tid_base_stuff, ARRAY_SIZE(tid_base_stuff));}
static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags){ return proc_pident_lookup(dir, dentry, tid_base_stuff, tid_base_stuff + ARRAY_SIZE(tid_base_stuff));}
static const struct file_operations proc_tid_base_operations = { .read = generic_read_dir, .iterate_shared = proc_tid_base_readdir, .llseek = generic_file_llseek,};
static const struct inode_operations proc_tid_base_inode_operations = { .lookup = proc_tid_base_lookup, .getattr = pid_getattr, .setattr = proc_nochmod_setattr,};
static struct dentry *proc_task_instantiate(struct dentry *dentry, struct task_struct *task, const void *ptr){ struct inode *inode; inode = proc_pid_make_base_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) return ERR_PTR(-ENOENT);
inode->i_op = &proc_tid_base_inode_operations; inode->i_fop = &proc_tid_base_operations; inode->i_flags |= S_IMMUTABLE;
set_nlink(inode, nlink_tid); pid_update_inode(task, inode);
return d_splice_alias_ops(inode, dentry, &pid_dentry_operations);}
static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags){ struct task_struct *task; struct task_struct *leader = get_proc_task(dir); unsigned tid; struct proc_fs_info *fs_info; struct pid_namespace *ns; struct dentry *result = ERR_PTR(-ENOENT);
if (!leader) goto out_no_task;
tid = name_to_int(&dentry->d_name); if (tid == ~0U) goto out;
fs_info = proc_sb_info(dentry->d_sb); ns = fs_info->pid_ns; rcu_read_lock(); task = find_task_by_pid_ns(tid, ns); if (task) get_task_struct(task); rcu_read_unlock(); if (!task) goto out; if (!same_thread_group(leader, task)) goto out_drop_task;
result = proc_task_instantiate(dentry, task, NULL);out_drop_task: put_task_struct(task);out: put_task_struct(leader);out_no_task: return result;}
/* * Find the first tid of a thread group to return to user space. * * Usually this is just the thread group leader, but if the users * buffer was too small or there was a seek into the middle of the * directory we have more work todo. * * In the case of a short read we start with find_task_by_pid. * * In the case of a seek we start with the leader and walk nr * threads past it. */static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, struct pid_namespace *ns){ struct task_struct *pos, *task; unsigned long nr = f_pos;
if (nr != f_pos) /* 32bit overflow? */ return NULL;
rcu_read_lock(); task = pid_task(pid, PIDTYPE_PID); if (!task) goto fail;
/* Attempt to start with the tid of a thread */ if (tid && nr) { pos = find_task_by_pid_ns(tid, ns); if (pos && same_thread_group(pos, task)) goto found; }
/* If nr exceeds the number of threads there is nothing todo */ if (nr >= get_nr_threads(task)) goto fail;
/* If we haven't found our starting place yet start * with the leader and walk nr threads forward. */ for_each_thread(task, pos) { if (!nr--) goto found; }fail: pos = NULL; goto out;found: get_task_struct(pos);out: rcu_read_unlock(); return pos;}
/* * Find the next thread in the thread list. * Return NULL if there is an error or no next thread. * * The reference to the input task_struct is released. */static struct task_struct *next_tid(struct task_struct *start){ struct task_struct *pos = NULL; rcu_read_lock(); if (pid_alive(start)) { pos = __next_thread(start); if (pos) get_task_struct(pos); } rcu_read_unlock(); put_task_struct(start); return pos;}
/* for the /proc/TGID/task/ directories */static int proc_task_readdir(struct file *file, struct dir_context *ctx){ struct inode *inode = file_inode(file); struct task_struct *task; struct pid_namespace *ns; int tid;
if (proc_inode_is_dead(inode)) return -ENOENT;
if (!dir_emit_dots(file, ctx)) return 0;
/* We cache the tgid value that the last readdir call couldn't * return and lseek resets it to 0. */ ns = proc_pid_ns(inode->i_sb); tid = (int)(intptr_t)file->private_data; file->private_data = NULL; for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); task; task = next_tid(task), ctx->pos++) { char name[10 + 1]; unsigned int len;
tid = task_pid_nr_ns(task, ns); if (!tid) continue; /* The task has just exited. */ len = snprintf(name, sizeof(name), "%d", tid); if (!proc_fill_cache(file, ctx, name, len, proc_task_instantiate, task, NULL)) { /* returning this tgid failed, save it as the first * pid for the next readir call */ file->private_data = (void *)(intptr_t)tid; put_task_struct(task); break; } }
return 0;}
static int proc_task_getattr(const struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags){ struct inode *inode = d_inode(path->dentry); struct task_struct *p = get_proc_task(inode); generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
if (p) { stat->nlink += get_nr_threads(p); put_task_struct(p); }
return 0;}
/* * proc_task_readdir() set @file->private_data to a positive integer * value, so casting that to u64 is safe. generic_llseek_cookie() will * set @cookie to 0, so casting to an int is safe. The WARN_ON_ONCE() is * here to catch any unexpected change in behavior either in * proc_task_readdir() or generic_llseek_cookie(). */static loff_t proc_dir_llseek(struct file *file, loff_t offset, int whence){ u64 cookie = (u64)(intptr_t)file->private_data; loff_t off;
off = generic_llseek_cookie(file, offset, whence, &cookie); WARN_ON_ONCE(cookie > INT_MAX); file->private_data = (void *)(intptr_t)cookie; /* serialized by f_pos_lock */ return off;}
static const struct inode_operations proc_task_inode_operations = { .lookup = proc_task_lookup, .getattr = proc_task_getattr, .setattr = proc_nochmod_setattr, .permission = proc_pid_permission,};
static const struct file_operations proc_task_operations = { .read = generic_read_dir, .iterate_shared = proc_task_readdir, .llseek = proc_dir_llseek,};
void __init set_proc_pid_nlink(void){ nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));}