summaryrefslogtreecommitdiff
path: root/fs/compat_ioctl.c
blob: ab4471f469e6bc7367d0d421e194e6096d2918ff (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
// 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;
}