Commit 7e2d8c29 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Russell King (Oracle)

ARM: 9111/1: oabi-compat: rework fcntl64() emulation

This is one of the last users of get_fs(), and this is fairly easy to
change, since the infrastructure for it is already there.

The replacement here is essentially a copy of the existing fcntl64()
syscall entry function.
Acked-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
parent bdec0145
......@@ -194,56 +194,83 @@ struct oabi_flock64 {
pid_t l_pid;
} __attribute__ ((packed,aligned(4)));
static long do_locks(unsigned int fd, unsigned int cmd,
unsigned long arg)
static int get_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
{
struct flock64 kernel;
struct oabi_flock64 user;
mm_segment_t fs;
long ret;
if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
sizeof(user)))
return -EFAULT;
kernel.l_type = user.l_type;
kernel.l_whence = user.l_whence;
kernel.l_start = user.l_start;
kernel.l_len = user.l_len;
kernel.l_pid = user.l_pid;
fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_fcntl64(fd, cmd, (unsigned long)&kernel);
set_fs(fs);
if (!ret && (cmd == F_GETLK64 || cmd == F_OFD_GETLK)) {
user.l_type = kernel.l_type;
user.l_whence = kernel.l_whence;
user.l_start = kernel.l_start;
user.l_len = kernel.l_len;
user.l_pid = kernel.l_pid;
if (copy_to_user((struct oabi_flock64 __user *)arg,
&user, sizeof(user)))
ret = -EFAULT;
}
return ret;
kernel->l_type = user.l_type;
kernel->l_whence = user.l_whence;
kernel->l_start = user.l_start;
kernel->l_len = user.l_len;
kernel->l_pid = user.l_pid;
return 0;
}
static int put_oabi_flock(struct flock64 *kernel, struct oabi_flock64 __user *arg)
{
struct oabi_flock64 user;
user.l_type = kernel->l_type;
user.l_whence = kernel->l_whence;
user.l_start = kernel->l_start;
user.l_len = kernel->l_len;
user.l_pid = kernel->l_pid;
if (copy_to_user((struct oabi_flock64 __user *)arg,
&user, sizeof(user)))
return -EFAULT;
return 0;
}
asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct fd f = fdget_raw(fd);
struct flock64 flock;
long err = -EBADF;
if (!f.file)
goto out;
switch (cmd) {
case F_OFD_GETLK:
case F_OFD_SETLK:
case F_OFD_SETLKW:
case F_GETLK64:
case F_OFD_GETLK:
err = security_file_fcntl(f.file, cmd, arg);
if (err)
break;
err = get_oabi_flock(&flock, argp);
if (err)
break;
err = fcntl_getlk64(f.file, cmd, &flock);
if (!err)
err = put_oabi_flock(&flock, argp);
break;
case F_SETLK64:
case F_SETLKW64:
return do_locks(fd, cmd, arg);
case F_OFD_SETLK:
case F_OFD_SETLKW:
err = security_file_fcntl(f.file, cmd, arg);
if (err)
break;
err = get_oabi_flock(&flock, argp);
if (err)
break;
err = fcntl_setlk64(fd, f.file, cmd, &flock);
break;
default:
return sys_fcntl64(fd, cmd, arg);
err = sys_fcntl64(fd, cmd, arg);
break;
}
fdput(f);
out:
return err;
}
struct oabi_epoll_event {
......
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