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// SPDX-License-Identifier: GPL-2.0
/*
* ioctl32.c: Conversion between 32bit and 64bit native ioctls.
*
* Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
* Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
*
* These routines maintain argument size conversion between 32bit and 64bit
* ioctls.
*/
#include <linux/types.h>
#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/capability.h>
#include <linux/compiler.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/ioctl.h>
#include <linux/if.h>
#include <linux/raid/md_u.h>
#include <linux/falloc.h>
#include <linux/file.h>
#include <linux/ppp-ioctl.h>
#include <linux/if_pppox.h>
#include <linux/tty.h>
#include <linux/vt_kern.h>
#include <linux/blkdev.h>
#include <linux/serial.h>
#include <linux/ctype.h>
#include <linux/syscalls.h>
#include <linux/gfp.h>
#include <linux/cec.h>
#include "internal.h"
#include <linux/uaccess.h>
#include <linux/watchdog.h>
#include <linux/hiddev.h>
COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
compat_ulong_t, arg32)
{
unsigned long arg = arg32;
struct fd f = fdget(fd);
int error = -EBADF;
if (!f.file)
goto out;
/* RED-PEN how should LSM module know it's handling 32bit? */
error = security_file_ioctl(f.file, cmd, arg);
if (error)
goto out_fput;
switch (cmd) {
/* these are never seen by ->ioctl(), no argument or int argument */
case FIOCLEX:
case FIONCLEX:
case FIFREEZE:
case FITHAW:
case FICLONE:
goto do_ioctl;
/* these are never seen by ->ioctl(), pointer argument */
case FIONBIO:
case FIOASYNC:
case FIOQSIZE:
case FS_IOC_FIEMAP:
case FIGETBSZ:
case FICLONERANGE:
case FIDEDUPERANGE:
goto found_handler;
/*
* The next group is the stuff handled inside file_ioctl().
* For regular files these never reach ->ioctl(); for
* devices, sockets, etc. they do and one (FIONREAD) is
* even accepted in some cases. In all those cases
* argument has the same type, so we can handle these
* here, shunting them towards do_vfs_ioctl().
* ->compat_ioctl() will never see any of those.
*/
/* pointer argument, never actually handled by ->ioctl() */
case FIBMAP:
goto found_handler;
/* handled by some ->ioctl(); always a pointer to int */
case FIONREAD:
goto found_handler;
/* these get messy on amd64 due to alignment differences */
#if defined(CONFIG_X86_64)
case FS_IOC_RESVSP_32:
case FS_IOC_RESVSP64_32:
error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg));
goto out_fput;
case FS_IOC_UNRESVSP_32:
case FS_IOC_UNRESVSP64_32:
error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE,
compat_ptr(arg));
goto out_fput;
case FS_IOC_ZERO_RANGE_32:
error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE,
compat_ptr(arg));
goto out_fput;
#else
case FS_IOC_RESVSP:
case FS_IOC_RESVSP64:
case FS_IOC_UNRESVSP:
case FS_IOC_UNRESVSP64:
case FS_IOC_ZERO_RANGE:
goto found_handler;
#endif
default:
if (f.file->f_op->compat_ioctl) {
error = f.file->f_op->compat_ioctl(f.file, cmd, arg);
if (error != -ENOIOCTLCMD)
goto out_fput;
}
error = -ENOTTY;
goto out_fput;
}
found_handler:
arg = (unsigned long)compat_ptr(arg);
do_ioctl:
error = do_vfs_ioctl(f.file, fd, cmd, arg);
out_fput:
fdput(f);
out:
return error;
}
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