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fd6c3d5acc
SG_GET_REQUEST_TABLE is now the last ioctl command that needs a conversion handler. This is only used in a single file, so the implementation should be there. I'm trying to simplify it in the process, to get rid of the compat_alloc_user_space() and extra copy, by adding a put_compat_request_table() function instead, which copies the data in the right format to user space. Cc: linux-scsi@vger.kernel.org Cc: Doug Gilbert <dgilbert@interlog.com> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
250 lines
6.1 KiB
C
250 lines
6.1 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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#ifdef CONFIG_BLOCK
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#include <linux/cdrom.h>
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#include <linux/fd.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/sg.h>
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#endif
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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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#include <linux/sort.h>
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/*
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* simple reversible transform to make our table more evenly
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* distributed after sorting.
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*/
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#define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
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#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
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static unsigned int ioctl_pointer[] = {
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#ifdef CONFIG_BLOCK
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/* Big S */
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COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
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COMPATIBLE_IOCTL(SCSI_IOCTL_DOORLOCK)
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COMPATIBLE_IOCTL(SCSI_IOCTL_DOORUNLOCK)
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COMPATIBLE_IOCTL(SCSI_IOCTL_TEST_UNIT_READY)
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COMPATIBLE_IOCTL(SCSI_IOCTL_GET_BUS_NUMBER)
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COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND)
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COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
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COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
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#endif
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#ifdef CONFIG_BLOCK
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/* SG stuff */
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COMPATIBLE_IOCTL(SG_IO)
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COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
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COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
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COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
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COMPATIBLE_IOCTL(SG_EMULATED_HOST)
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COMPATIBLE_IOCTL(SG_GET_TRANSFORM)
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COMPATIBLE_IOCTL(SG_SET_RESERVED_SIZE)
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COMPATIBLE_IOCTL(SG_GET_RESERVED_SIZE)
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COMPATIBLE_IOCTL(SG_GET_SCSI_ID)
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COMPATIBLE_IOCTL(SG_SET_FORCE_LOW_DMA)
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COMPATIBLE_IOCTL(SG_GET_LOW_DMA)
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COMPATIBLE_IOCTL(SG_SET_FORCE_PACK_ID)
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COMPATIBLE_IOCTL(SG_GET_PACK_ID)
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COMPATIBLE_IOCTL(SG_GET_NUM_WAITING)
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COMPATIBLE_IOCTL(SG_SET_DEBUG)
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COMPATIBLE_IOCTL(SG_GET_SG_TABLESIZE)
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COMPATIBLE_IOCTL(SG_GET_COMMAND_Q)
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COMPATIBLE_IOCTL(SG_SET_COMMAND_Q)
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COMPATIBLE_IOCTL(SG_GET_VERSION_NUM)
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COMPATIBLE_IOCTL(SG_NEXT_CMD_LEN)
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COMPATIBLE_IOCTL(SG_SCSI_RESET)
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COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE)
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COMPATIBLE_IOCTL(SG_SET_KEEP_ORPHAN)
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COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN)
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#endif
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};
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/*
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* Convert common ioctl arguments based on their command number
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*
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* Please do not add any code in here. Instead, implement
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* a compat_ioctl operation in the place that handleѕ the
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* ioctl for the native case.
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*/
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static long do_ioctl_trans(unsigned int cmd,
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unsigned long arg, struct file *file)
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{
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return -ENOIOCTLCMD;
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}
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static int compat_ioctl_check_table(unsigned int xcmd)
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{
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#ifdef CONFIG_BLOCK
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int i;
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const int max = ARRAY_SIZE(ioctl_pointer) - 1;
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BUILD_BUG_ON(max >= (1 << 16));
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/* guess initial offset into table, assuming a
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normalized distribution */
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i = ((xcmd >> 16) * max) >> 16;
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/* do linear search up first, until greater or equal */
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while (ioctl_pointer[i] < xcmd && i < max)
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i++;
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/* then do linear search down */
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while (ioctl_pointer[i] > xcmd && i > 0)
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i--;
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return ioctl_pointer[i] == xcmd;
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#else
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return 0;
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#endif
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}
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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 two 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, 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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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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if (!f.file->f_op->unlocked_ioctl)
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goto do_ioctl;
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break;
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}
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if (compat_ioctl_check_table(XFORM(cmd)))
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goto found_handler;
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error = do_ioctl_trans(cmd, arg, f.file);
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if (error == -ENOIOCTLCMD)
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error = -ENOTTY;
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goto out_fput;
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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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static int __init init_sys32_ioctl_cmp(const void *p, const void *q)
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{
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unsigned int a, b;
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a = *(unsigned int *)p;
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b = *(unsigned int *)q;
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if (a > b)
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return 1;
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if (a < b)
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return -1;
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return 0;
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}
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static int __init init_sys32_ioctl(void)
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{
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sort(ioctl_pointer, ARRAY_SIZE(ioctl_pointer), sizeof(*ioctl_pointer),
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init_sys32_ioctl_cmp, NULL);
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return 0;
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}
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__initcall(init_sys32_ioctl);
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