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https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
synced 2026-04-18 03:23:53 -04:00
d320a9551e
Each driver calling scsi_ioctl() gets an equivalent compat_ioctl() handler that implements the same commands by calling scsi_compat_ioctl(). The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible at this point, so any driver that calls those can do so for both native and compat mode, with the argument passed through compat_ptr(). With this, we can remove the entries from fs/compat_ioctl.c. The new code is larger, but should be easier to maintain and keep updated with newly added commands. Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ioctl32.c: Conversion between 32bit and 64bit native ioctls.
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*
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* Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
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* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
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* Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
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*
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* These routines maintain argument size conversion between 32bit and 64bit
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* ioctls.
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*/
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#include <linux/types.h>
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#include <linux/compat.h>
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#include <linux/kernel.h>
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#include <linux/capability.h>
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#include <linux/compiler.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/ioctl.h>
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#include <linux/if.h>
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#include <linux/raid/md_u.h>
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#include <linux/falloc.h>
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#include <linux/file.h>
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#include <linux/ppp-ioctl.h>
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#include <linux/if_pppox.h>
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#include <linux/tty.h>
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#include <linux/vt_kern.h>
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#include <linux/blkdev.h>
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#include <linux/serial.h>
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#include <linux/ctype.h>
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#include <linux/syscalls.h>
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#include <linux/gfp.h>
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#include <linux/cec.h>
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#include "internal.h"
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <linux/hiddev.h>
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COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
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compat_ulong_t, arg32)
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{
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unsigned long arg = arg32;
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struct fd f = fdget(fd);
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int error = -EBADF;
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if (!f.file)
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goto out;
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/* RED-PEN how should LSM module know it's handling 32bit? */
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error = security_file_ioctl(f.file, cmd, arg);
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if (error)
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goto out_fput;
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switch (cmd) {
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/* these are never seen by ->ioctl(), no argument or int argument */
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case FIOCLEX:
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case FIONCLEX:
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case FIFREEZE:
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case FITHAW:
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case FICLONE:
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goto do_ioctl;
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/* these are never seen by ->ioctl(), pointer argument */
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case FIONBIO:
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case FIOASYNC:
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case FIOQSIZE:
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case FS_IOC_FIEMAP:
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case FIGETBSZ:
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case FICLONERANGE:
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case FIDEDUPERANGE:
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goto found_handler;
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/*
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* The next group is the stuff handled inside file_ioctl().
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* For regular files these never reach ->ioctl(); for
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* devices, sockets, etc. they do and one (FIONREAD) is
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* even accepted in some cases. In all those cases
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* argument has the same type, so we can handle these
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* here, shunting them towards do_vfs_ioctl().
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* ->compat_ioctl() will never see any of those.
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*/
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/* pointer argument, never actually handled by ->ioctl() */
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case FIBMAP:
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goto found_handler;
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/* handled by some ->ioctl(); always a pointer to int */
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case FIONREAD:
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goto found_handler;
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/* these get messy on amd64 due to alignment differences */
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#if defined(CONFIG_X86_64)
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case FS_IOC_RESVSP_32:
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case FS_IOC_RESVSP64_32:
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error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg));
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goto out_fput;
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case FS_IOC_UNRESVSP_32:
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case FS_IOC_UNRESVSP64_32:
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error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE,
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compat_ptr(arg));
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goto out_fput;
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case FS_IOC_ZERO_RANGE_32:
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error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE,
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compat_ptr(arg));
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goto out_fput;
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#else
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case FS_IOC_RESVSP:
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case FS_IOC_RESVSP64:
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case FS_IOC_UNRESVSP:
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case FS_IOC_UNRESVSP64:
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case FS_IOC_ZERO_RANGE:
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goto found_handler;
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#endif
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default:
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if (f.file->f_op->compat_ioctl) {
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error = f.file->f_op->compat_ioctl(f.file, cmd, arg);
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if (error != -ENOIOCTLCMD)
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goto out_fput;
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}
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error = -ENOTTY;
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goto out_fput;
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}
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found_handler:
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arg = (unsigned long)compat_ptr(arg);
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do_ioctl:
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error = do_vfs_ioctl(f.file, fd, cmd, arg);
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out_fput:
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fdput(f);
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out:
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return error;
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}
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