#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/file.h>
+#include <linux/fdtable.h>
#include <linux/capability.h>
#include <linux/dnotify.h>
#include <linux/smp_lock.h>
#include <linux/ptrace.h>
#include <linux/signal.h>
#include <linux/rcupdate.h>
+#include <linux/pid_namespace.h>
#include <asm/poll.h>
#include <asm/siginfo.h>
#include <asm/uaccess.h>
-void fastcall set_close_on_exec(unsigned int fd, int flag)
+void set_close_on_exec(unsigned int fd, int flag)
{
struct files_struct *files = current->files;
struct fdtable *fdt;
* file_lock held for write.
*/
-static int locate_fd(struct files_struct *files,
- struct file *file, unsigned int orig_start)
+static int locate_fd(unsigned int orig_start, int cloexec)
{
+ struct files_struct *files = current->files;
unsigned int newfd;
unsigned int start;
int error;
struct fdtable *fdt;
+ spin_lock(&files->file_lock);
+
error = -EINVAL;
if (orig_start >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
goto out;
start = files->next_fd;
newfd = start;
- if (start < fdt->max_fdset) {
+ if (start < fdt->max_fds)
newfd = find_next_zero_bit(fdt->open_fds->fds_bits,
- fdt->max_fdset, start);
- }
+ fdt->max_fds, start);
error = -EMFILE;
if (newfd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
if (error)
goto repeat;
- /*
- * We reacquired files_lock, so we are safe as long as
- * we reacquire the fdtable pointer and use it while holding
- * the lock, no one can free it during that time.
- */
if (start <= files->next_fd)
files->next_fd = newfd + 1;
+ FD_SET(newfd, fdt->open_fds);
+ if (cloexec)
+ FD_SET(newfd, fdt->close_on_exec);
+ else
+ FD_CLR(newfd, fdt->close_on_exec);
error = newfd;
-
+
out:
+ spin_unlock(&files->file_lock);
return error;
}
-static int dupfd(struct file *file, unsigned int start)
+static int dupfd(struct file *file, unsigned int start, int cloexec)
{
- struct files_struct * files = current->files;
- struct fdtable *fdt;
- int fd;
-
- spin_lock(&files->file_lock);
- fd = locate_fd(files, file, start);
- if (fd >= 0) {
- /* locate_fd() may have expanded fdtable, load the ptr */
- fdt = files_fdtable(files);
- FD_SET(fd, fdt->open_fds);
- FD_CLR(fd, fdt->close_on_exec);
- spin_unlock(&files->file_lock);
+ int fd = locate_fd(start, cloexec);
+ if (fd >= 0)
fd_install(fd, file);
- } else {
- spin_unlock(&files->file_lock);
+ else
fput(file);
- }
return fd;
}
struct file * file = fget(fildes);
if (file)
- ret = dupfd(file, 0);
+ ret = dupfd(file, 0, 0);
return ret;
}
static int setfl(int fd, struct file * filp, unsigned long arg)
{
- struct inode * inode = filp->f_dentry->d_inode;
+ struct inode * inode = filp->f_path.dentry->d_inode;
int error = 0;
/*
/* O_NOATIME can only be set by the owner or superuser */
if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME))
- if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
+ if (!is_owner_or_cap(inode))
return -EPERM;
/* required for strict SunOS emulation */
return error;
}
-static void f_modown(struct file *filp, unsigned long pid,
+static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
uid_t uid, uid_t euid, int force)
{
write_lock_irq(&filp->f_owner.lock);
if (force || !filp->f_owner.pid) {
- filp->f_owner.pid = pid;
+ put_pid(filp->f_owner.pid);
+ filp->f_owner.pid = get_pid(pid);
+ filp->f_owner.pid_type = type;
filp->f_owner.uid = uid;
filp->f_owner.euid = euid;
}
write_unlock_irq(&filp->f_owner.lock);
}
-int f_setown(struct file *filp, unsigned long arg, int force)
+int __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
+ int force)
{
int err;
if (err)
return err;
- f_modown(filp, arg, current->uid, current->euid, force);
+ f_modown(filp, pid, type, current->uid, current->euid, force);
return 0;
}
+EXPORT_SYMBOL(__f_setown);
+int f_setown(struct file *filp, unsigned long arg, int force)
+{
+ enum pid_type type;
+ struct pid *pid;
+ int who = arg;
+ int result;
+ type = PIDTYPE_PID;
+ if (who < 0) {
+ type = PIDTYPE_PGID;
+ who = -who;
+ }
+ rcu_read_lock();
+ pid = find_vpid(who);
+ result = __f_setown(filp, pid, type, force);
+ rcu_read_unlock();
+ return result;
+}
EXPORT_SYMBOL(f_setown);
void f_delown(struct file *filp)
{
- f_modown(filp, 0, 0, 0, 1);
+ f_modown(filp, NULL, PIDTYPE_PID, 0, 0, 1);
+}
+
+pid_t f_getown(struct file *filp)
+{
+ pid_t pid;
+ read_lock(&filp->f_owner.lock);
+ pid = pid_vnr(filp->f_owner.pid);
+ if (filp->f_owner.pid_type == PIDTYPE_PGID)
+ pid = -pid;
+ read_unlock(&filp->f_owner.lock);
+ return pid;
}
static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
switch (cmd) {
case F_DUPFD:
+ case F_DUPFD_CLOEXEC:
get_file(filp);
- err = dupfd(filp, arg);
+ err = dupfd(filp, arg, cmd == F_DUPFD_CLOEXEC);
break;
case F_GETFD:
err = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
* current syscall conventions, the only way
* to fix this will be in libc.
*/
- err = filp->f_owner.pid;
+ err = f_getown(filp);
force_successful_syscall_return();
break;
case F_SETOWN:
/* Make sure we are called with one of the POLL_*
reasons, otherwise we could leak kernel stack into
userspace. */
- if ((reason & __SI_MASK) != __SI_POLL)
- BUG();
+ BUG_ON((reason & __SI_MASK) != __SI_POLL);
if (reason - POLL_IN >= NSIGPOLL)
si.si_band = ~0L;
else
void send_sigio(struct fown_struct *fown, int fd, int band)
{
struct task_struct *p;
- int pid;
+ enum pid_type type;
+ struct pid *pid;
read_lock(&fown->lock);
+ type = fown->pid_type;
pid = fown->pid;
if (!pid)
goto out_unlock_fown;
read_lock(&tasklist_lock);
- if (pid > 0) {
- p = find_task_by_pid(pid);
- if (p) {
- send_sigio_to_task(p, fown, fd, band);
- }
- } else {
- do_each_task_pid(-pid, PIDTYPE_PGID, p) {
- send_sigio_to_task(p, fown, fd, band);
- } while_each_task_pid(-pid, PIDTYPE_PGID, p);
- }
+ do_each_pid_task(pid, type, p) {
+ send_sigio_to_task(p, fown, fd, band);
+ } while_each_pid_task(pid, type, p);
read_unlock(&tasklist_lock);
out_unlock_fown:
read_unlock(&fown->lock);
int send_sigurg(struct fown_struct *fown)
{
struct task_struct *p;
- int pid, ret = 0;
+ enum pid_type type;
+ struct pid *pid;
+ int ret = 0;
read_lock(&fown->lock);
+ type = fown->pid_type;
pid = fown->pid;
if (!pid)
goto out_unlock_fown;
ret = 1;
read_lock(&tasklist_lock);
- if (pid > 0) {
- p = find_task_by_pid(pid);
- if (p) {
- send_sigurg_to_task(p, fown);
- }
- } else {
- do_each_task_pid(-pid, PIDTYPE_PGID, p) {
- send_sigurg_to_task(p, fown);
- } while_each_task_pid(-pid, PIDTYPE_PGID, p);
- }
+ do_each_pid_task(pid, type, p) {
+ send_sigurg_to_task(p, fown);
+ } while_each_pid_task(pid, type, p);
read_unlock(&tasklist_lock);
out_unlock_fown:
read_unlock(&fown->lock);
}
static DEFINE_RWLOCK(fasync_lock);
-static kmem_cache_t *fasync_cache __read_mostly;
+static struct kmem_cache *fasync_cache __read_mostly;
/*
* fasync_helper() is used by some character device drivers (mainly mice)
int result = 0;
if (on) {
- new = kmem_cache_alloc(fasync_cache, SLAB_KERNEL);
+ new = kmem_cache_alloc(fasync_cache, GFP_KERNEL);
if (!new)
return -ENOMEM;
}
static int __init fasync_init(void)
{
fasync_cache = kmem_cache_create("fasync_cache",
- sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL, NULL);
+ sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL);
return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff