17c7e7f407
The ppp_idle structure is defined in terms of __kernel_time_t, which is defined as 'long' on all architectures, and this usage is not affected by the y2038 problem since it transports a time interval rather than an absolute time. However, the ppp user space defines the same structure as time_t, which may be 64-bit wide on new libc versions even on 32-bit architectures. It's easy enough to just handle both possible structure layouts on all architectures, to deal with the possibility that a user space ppp implementation comes with its own ppp_idle structure definition, as well as to document the fact that the driver is y2038-safe. Doing this also avoids the need for a special compat mode translation, since 32-bit and 64-bit kernels now support the same interfaces. The old 32-bit structure is also available on native 64-bit architectures now, but this is harmless. Cc: netdev@vger.kernel.org Cc: linux-ppp@vger.kernel.org Cc: Paul Mackerras <paulus@samba.org> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
333 lines
8.2 KiB
C
333 lines
8.2 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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#ifdef CONFIG_BLOCK
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static int do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int err;
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err = security_file_ioctl(file, cmd, arg);
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if (err)
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return err;
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return vfs_ioctl(file, cmd, arg);
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}
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struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
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char req_state;
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char orphan;
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char sg_io_owned;
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char problem;
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int pack_id;
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compat_uptr_t usr_ptr;
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unsigned int duration;
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int unused;
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};
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static int sg_grt_trans(struct file *file,
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unsigned int cmd, struct compat_sg_req_info __user *o)
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{
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int err, i;
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sg_req_info_t __user *r;
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r = compat_alloc_user_space(sizeof(sg_req_info_t)*SG_MAX_QUEUE);
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err = do_ioctl(file, cmd, (unsigned long)r);
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if (err < 0)
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return err;
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for (i = 0; i < SG_MAX_QUEUE; i++) {
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void __user *ptr;
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int d;
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if (copy_in_user(o + i, r + i, offsetof(sg_req_info_t, usr_ptr)) ||
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get_user(ptr, &r[i].usr_ptr) ||
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get_user(d, &r[i].duration) ||
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put_user((u32)(unsigned long)(ptr), &o[i].usr_ptr) ||
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put_user(d, &o[i].duration))
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return -EFAULT;
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}
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return err;
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}
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#endif /* CONFIG_BLOCK */
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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_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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/* PPP stuff */
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COMPATIBLE_IOCTL(PPPIOCGFLAGS)
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COMPATIBLE_IOCTL(PPPIOCSFLAGS)
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COMPATIBLE_IOCTL(PPPIOCGASYNCMAP)
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COMPATIBLE_IOCTL(PPPIOCSASYNCMAP)
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COMPATIBLE_IOCTL(PPPIOCGUNIT)
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COMPATIBLE_IOCTL(PPPIOCGRASYNCMAP)
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COMPATIBLE_IOCTL(PPPIOCSRASYNCMAP)
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COMPATIBLE_IOCTL(PPPIOCGMRU)
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COMPATIBLE_IOCTL(PPPIOCSMRU)
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COMPATIBLE_IOCTL(PPPIOCSMAXCID)
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COMPATIBLE_IOCTL(PPPIOCGXASYNCMAP)
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COMPATIBLE_IOCTL(PPPIOCSXASYNCMAP)
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COMPATIBLE_IOCTL(PPPIOCXFERUNIT)
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/* PPPIOCSCOMPRESS is translated */
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COMPATIBLE_IOCTL(PPPIOCGNPMODE)
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COMPATIBLE_IOCTL(PPPIOCSNPMODE)
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COMPATIBLE_IOCTL(PPPIOCGDEBUG)
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COMPATIBLE_IOCTL(PPPIOCSDEBUG)
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/* PPPIOCSPASS is translated */
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/* PPPIOCSACTIVE is translated */
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COMPATIBLE_IOCTL(PPPIOCGIDLE32)
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COMPATIBLE_IOCTL(PPPIOCGIDLE64)
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COMPATIBLE_IOCTL(PPPIOCNEWUNIT)
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COMPATIBLE_IOCTL(PPPIOCATTACH)
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COMPATIBLE_IOCTL(PPPIOCDETACH)
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COMPATIBLE_IOCTL(PPPIOCSMRRU)
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COMPATIBLE_IOCTL(PPPIOCCONNECT)
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COMPATIBLE_IOCTL(PPPIOCDISCONN)
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COMPATIBLE_IOCTL(PPPIOCATTCHAN)
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COMPATIBLE_IOCTL(PPPIOCGCHAN)
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COMPATIBLE_IOCTL(PPPIOCGL2TPSTATS)
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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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#ifdef CONFIG_BLOCK
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void __user *argp = compat_ptr(arg);
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switch (cmd) {
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case SG_GET_REQUEST_TABLE:
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return sg_grt_trans(file, cmd, argp);
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}
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#endif
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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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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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}
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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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