Release 4.11 fs/proc/fd.c
#include <linux/sched/signal.h>
#include <linux/errno.h>
#include <linux/dcache.h>
#include <linux/path.h>
#include <linux/fdtable.h>
#include <linux/namei.h>
#include <linux/pid.h>
#include <linux/security.h>
#include <linux/file.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include "../mount.h"
#include "internal.h"
#include "fd.h"
static int seq_show(struct seq_file *m, void *v)
{
struct files_struct *files = NULL;
int f_flags = 0, ret = -ENOENT;
struct file *file = NULL;
struct task_struct *task;
task = get_proc_task(m->private);
if (!task)
return -ENOENT;
files = get_files_struct(task);
put_task_struct(task);
if (files) {
unsigned int fd = proc_fd(m->private);
spin_lock(&files->file_lock);
file = fcheck_files(files, fd);
if (file) {
struct fdtable *fdt = files_fdtable(files);
f_flags = file->f_flags;
if (close_on_exec(fd, fdt))
f_flags |= O_CLOEXEC;
get_file(file);
ret = 0;
}
spin_unlock(&files->file_lock);
put_files_struct(files);
}
if (ret)
return ret;
seq_printf(m, "pos:\t%lli\nflags:\t0%o\nmnt_id:\t%i\n",
(long long)file->f_pos, f_flags,
real_mount(file->f_path.mnt)->mnt_id);
show_fd_locks(m, file, files);
if (seq_has_overflowed(m))
goto out;
if (file->f_op->show_fdinfo)
file->f_op->show_fdinfo(m, file);
out:
fput(file);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 210 | 84.68% | 3 | 50.00% |
| Andrey Vagin | 37 | 14.92% | 2 | 33.33% |
| Alexey Dobriyan | 1 | 0.40% | 1 | 16.67% |
| Total | 248 | 100.00% | 6 | 100.00% |
static int seq_fdinfo_open(struct inode *inode, struct file *file)
{
return single_open(file, seq_show, inode);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 26 | 100.00% | 2 | 100.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
static const struct file_operations proc_fdinfo_file_operations = {
.open = seq_fdinfo_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags)
{
struct files_struct *files;
struct task_struct *task;
struct inode *inode;
unsigned int fd;
if (flags & LOOKUP_RCU)
return -ECHILD;
inode = d_inode(dentry);
task = get_proc_task(inode);
fd = proc_fd(inode);
if (task) {
files = get_files_struct(task);
if (files) {
struct file *file;
rcu_read_lock();
file = fcheck_files(files, fd);
if (file) {
unsigned f_mode = file->f_mode;
rcu_read_unlock();
put_files_struct(files);
task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid);
if (S_ISLNK(inode->i_mode)) {
unsigned i_mode = S_IFLNK;
if (f_mode & FMODE_READ)
i_mode |= S_IRUSR | S_IXUSR;
if (f_mode & FMODE_WRITE)
i_mode |= S_IWUSR | S_IXUSR;
inode->i_mode = i_mode;
}
security_task_to_inode(task, inode);
put_task_struct(task);
return 1;
}
rcu_read_unlock();
put_files_struct(files);
}
put_task_struct(task);
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 204 | 94.44% | 1 | 25.00% |
| Eric W. Biedermann | 8 | 3.70% | 1 | 25.00% |
| David Howells | 3 | 1.39% | 1 | 25.00% |
| Alexey Dobriyan | 1 | 0.46% | 1 | 25.00% |
| Total | 216 | 100.00% | 4 | 100.00% |
static const struct dentry_operations tid_fd_dentry_operations = {
.d_revalidate = tid_fd_revalidate,
.d_delete = pid_delete_dentry,
};
static int proc_fd_link(struct dentry *dentry, struct path *path)
{
struct files_struct *files = NULL;
struct task_struct *task;
int ret = -ENOENT;
task = get_proc_task(d_inode(dentry));
if (task) {
files = get_files_struct(task);
put_task_struct(task);
}
if (files) {
unsigned int fd = proc_fd(d_inode(dentry));
struct file *fd_file;
spin_lock(&files->file_lock);
fd_file = fcheck_files(files, fd);
if (fd_file) {
*path = fd_file->f_path;
path_get(&fd_file->f_path);
ret = 0;
}
spin_unlock(&files->file_lock);
put_files_struct(files);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 136 | 95.10% | 2 | 50.00% |
| David Howells | 6 | 4.20% | 1 | 25.00% |
| Alexey Dobriyan | 1 | 0.70% | 1 | 25.00% |
| Total | 143 | 100.00% | 4 | 100.00% |
static int
proc_fd_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr)
{
unsigned fd = (unsigned long)ptr;
struct proc_inode *ei;
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK);
if (!inode)
goto out;
ei = PROC_I(inode);
ei->fd = fd;
inode->i_op = &proc_pid_link_inode_operations;
inode->i_size = 64;
ei->op.proc_get_link = proc_fd_link;
d_set_d_op(dentry, &tid_fd_dentry_operations);
d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
if (tid_fd_revalidate(dentry, 0))
return 0;
out:
return -ENOENT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 126 | 94.03% | 1 | 33.33% |
| Al Viro | 6 | 4.48% | 1 | 33.33% |
| Andreas Gruenbacher | 2 | 1.49% | 1 | 33.33% |
| Total | 134 | 100.00% | 3 | 100.00% |
static struct dentry *proc_lookupfd_common(struct inode *dir,
struct dentry *dentry,
instantiate_t instantiate)
{
struct task_struct *task = get_proc_task(dir);
int result = -ENOENT;
unsigned fd = name_to_int(&dentry->d_name);
if (!task)
goto out_no_task;
if (fd == ~0U)
goto out;
result = instantiate(dir, dentry, task, (void *)(unsigned long)fd);
out:
put_task_struct(task);
out_no_task:
return ERR_PTR(result);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 95 | 93.14% | 1 | 33.33% |
| Al Viro | 4 | 3.92% | 1 | 33.33% |
| Alexey Dobriyan | 3 | 2.94% | 1 | 33.33% |
| Total | 102 | 100.00% | 3 | 100.00% |
static int proc_readfd_common(struct file *file, struct dir_context *ctx,
instantiate_t instantiate)
{
struct task_struct *p = get_proc_task(file_inode(file));
struct files_struct *files;
unsigned int fd;
if (!p)
return -ENOENT;
if (!dir_emit_dots(file, ctx))
goto out;
files = get_files_struct(p);
if (!files)
goto out;
rcu_read_lock();
for (fd = ctx->pos - 2;
fd < files_fdtable(files)->max_fds;
fd++, ctx->pos++) {
char name[PROC_NUMBUF];
int len;
if (!fcheck_files(files, fd))
continue;
rcu_read_unlock();
len = snprintf(name, sizeof(name), "%u", fd);
if (!proc_fill_cache(file, ctx,
name, len, instantiate, p,
(void *)(unsigned long)fd))
goto out_fd_loop;
cond_resched();
rcu_read_lock();
}
rcu_read_unlock();
out_fd_loop:
put_files_struct(files);
out:
put_task_struct(p);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 176 | 85.44% | 1 | 25.00% |
| Al Viro | 26 | 12.62% | 1 | 25.00% |
| Eric Dumazet | 3 | 1.46% | 1 | 25.00% |
| Alexey Dobriyan | 1 | 0.49% | 1 | 25.00% |
| Total | 206 | 100.00% | 4 | 100.00% |
static int proc_readfd(struct file *file, struct dir_context *ctx)
{
return proc_readfd_common(file, ctx, proc_fd_instantiate);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 20 | 76.92% | 1 | 50.00% |
| Al Viro | 6 | 23.08% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
const struct file_operations proc_fd_operations = {
.read = generic_read_dir,
.iterate_shared = proc_readfd,
.llseek = generic_file_llseek,
};
static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
/*
* /proc/pid/fd needs a special permission handler so that a process can still
* access /proc/self/fd after it has executed a setuid().
*/
int proc_fd_permission(struct inode *inode, int mask)
{
struct task_struct *p;
int rv;
rv = generic_permission(inode, mask);
if (rv == 0)
return rv;
rcu_read_lock();
p = pid_task(proc_pid(inode), PIDTYPE_PID);
if (p && same_thread_group(p, current))
rv = 0;
rcu_read_unlock();
return rv;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 42 | 56.00% | 1 | 50.00% |
| Oleg Nesterov | 33 | 44.00% | 1 | 50.00% |
| Total | 75 | 100.00% | 2 | 100.00% |
const struct inode_operations proc_fd_inode_operations = {
.lookup = proc_lookupfd,
.permission = proc_fd_permission,
.setattr = proc_setattr,
};
static int
proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr)
{
unsigned fd = (unsigned long)ptr;
struct proc_inode *ei;
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task, S_IFREG | S_IRUSR);
if (!inode)
goto out;
ei = PROC_I(inode);
ei->fd = fd;
inode->i_fop = &proc_fdinfo_file_operations;
d_set_d_op(dentry, &tid_fd_dentry_operations);
d_add(dentry, inode);
/* Close the race of the process dying before we return the dentry */
if (tid_fd_revalidate(dentry, 0))
return 0;
out:
return -ENOENT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 112 | 91.80% | 1 | 33.33% |
| Al Viro | 6 | 4.92% | 1 | 33.33% |
| Andreas Gruenbacher | 4 | 3.28% | 1 | 33.33% |
| Total | 122 | 100.00% | 3 | 100.00% |
static struct dentry *
proc_lookupfdinfo(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 32 | 100.00% | 1 | 100.00% |
| Total | 32 | 100.00% | 1 | 100.00% |
static int proc_readfdinfo(struct file *file, struct dir_context *ctx)
{
return proc_readfd_common(file, ctx,
proc_fdinfo_instantiate);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 20 | 76.92% | 1 | 50.00% |
| Al Viro | 6 | 23.08% | 1 | 50.00% |
| Total | 26 | 100.00% | 2 | 100.00% |
const struct inode_operations proc_fdinfo_inode_operations = {
.lookup = proc_lookupfdinfo,
.setattr = proc_setattr,
};
const struct file_operations proc_fdinfo_operations = {
.read = generic_read_dir,
.iterate_shared = proc_readfdinfo,
.llseek = generic_file_llseek,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Cyrill V. Gorcunov | 1395 | 89.25% | 3 | 18.75% |
| Al Viro | 58 | 3.71% | 3 | 18.75% |
| Andrey Vagin | 43 | 2.75% | 2 | 12.50% |
| Oleg Nesterov | 33 | 2.11% | 1 | 6.25% |
| David Howells | 9 | 0.58% | 1 | 6.25% |
| Eric W. Biedermann | 8 | 0.51% | 1 | 6.25% |
| Alexey Dobriyan | 7 | 0.45% | 2 | 12.50% |
| Andreas Gruenbacher | 6 | 0.38% | 1 | 6.25% |
| Eric Dumazet | 3 | 0.19% | 1 | 6.25% |
| Ingo Molnar | 1 | 0.06% | 1 | 6.25% |
| Total | 1563 | 100.00% | 16 | 100.00% |
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