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![Christoph Hellwig](/assets/img/avatar_default.png)
The mp variable in xfs_file_compat_ioctl is only used when
BROKEN_X86_ALIGNMENT is define. Remove it and just open code the
dereference in a few places.
Link: https://lore.kernel.org/r/20210203173009.462205-1-christian.brauner@ubuntu.com
Fixes: f736d93d76
("xfs: support idmapped mounts")
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
544 lines
15 KiB
C
544 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2004-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include <linux/mount.h>
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#include <linux/fsmap.h>
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_iwalk.h"
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#include "xfs_itable.h"
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#include "xfs_fsops.h"
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#include "xfs_rtalloc.h"
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#include "xfs_attr.h"
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#include "xfs_ioctl.h"
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#include "xfs_ioctl32.h"
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#include "xfs_trace.h"
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#include "xfs_sb.h"
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#define _NATIVE_IOC(cmd, type) \
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_IOC(_IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd), sizeof(type))
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#ifdef BROKEN_X86_ALIGNMENT
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STATIC int
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xfs_compat_flock64_copyin(
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xfs_flock64_t *bf,
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compat_xfs_flock64_t __user *arg32)
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{
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if (get_user(bf->l_type, &arg32->l_type) ||
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get_user(bf->l_whence, &arg32->l_whence) ||
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get_user(bf->l_start, &arg32->l_start) ||
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get_user(bf->l_len, &arg32->l_len) ||
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get_user(bf->l_sysid, &arg32->l_sysid) ||
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get_user(bf->l_pid, &arg32->l_pid) ||
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copy_from_user(bf->l_pad, &arg32->l_pad, 4*sizeof(u32)))
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return -EFAULT;
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return 0;
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}
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STATIC int
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xfs_compat_ioc_fsgeometry_v1(
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struct xfs_mount *mp,
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compat_xfs_fsop_geom_v1_t __user *arg32)
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{
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struct xfs_fsop_geom fsgeo;
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xfs_fs_geometry(&mp->m_sb, &fsgeo, 3);
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/* The 32-bit variant simply has some padding at the end */
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if (copy_to_user(arg32, &fsgeo, sizeof(struct compat_xfs_fsop_geom_v1)))
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return -EFAULT;
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return 0;
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}
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STATIC int
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xfs_compat_growfs_data_copyin(
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struct xfs_growfs_data *in,
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compat_xfs_growfs_data_t __user *arg32)
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{
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if (get_user(in->newblocks, &arg32->newblocks) ||
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get_user(in->imaxpct, &arg32->imaxpct))
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return -EFAULT;
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return 0;
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}
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STATIC int
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xfs_compat_growfs_rt_copyin(
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struct xfs_growfs_rt *in,
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compat_xfs_growfs_rt_t __user *arg32)
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{
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if (get_user(in->newblocks, &arg32->newblocks) ||
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get_user(in->extsize, &arg32->extsize))
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return -EFAULT;
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return 0;
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}
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STATIC int
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xfs_fsinumbers_fmt_compat(
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struct xfs_ibulk *breq,
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const struct xfs_inumbers *ig)
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{
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struct compat_xfs_inogrp __user *p32 = breq->ubuffer;
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struct xfs_inogrp ig1;
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struct xfs_inogrp *igrp = &ig1;
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xfs_inumbers_to_inogrp(&ig1, ig);
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if (put_user(igrp->xi_startino, &p32->xi_startino) ||
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put_user(igrp->xi_alloccount, &p32->xi_alloccount) ||
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put_user(igrp->xi_allocmask, &p32->xi_allocmask))
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return -EFAULT;
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return xfs_ibulk_advance(breq, sizeof(struct compat_xfs_inogrp));
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}
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#else
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#define xfs_fsinumbers_fmt_compat xfs_fsinumbers_fmt
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#endif /* BROKEN_X86_ALIGNMENT */
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STATIC int
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xfs_ioctl32_bstime_copyin(
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xfs_bstime_t *bstime,
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compat_xfs_bstime_t __user *bstime32)
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{
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old_time32_t sec32; /* tv_sec differs on 64 vs. 32 */
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if (get_user(sec32, &bstime32->tv_sec) ||
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get_user(bstime->tv_nsec, &bstime32->tv_nsec))
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return -EFAULT;
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bstime->tv_sec = sec32;
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return 0;
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}
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/*
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* struct xfs_bstat has differing alignment on intel, & bstime_t sizes
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* everywhere
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*/
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STATIC int
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xfs_ioctl32_bstat_copyin(
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struct xfs_bstat *bstat,
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struct compat_xfs_bstat __user *bstat32)
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{
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if (get_user(bstat->bs_ino, &bstat32->bs_ino) ||
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get_user(bstat->bs_mode, &bstat32->bs_mode) ||
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get_user(bstat->bs_nlink, &bstat32->bs_nlink) ||
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get_user(bstat->bs_uid, &bstat32->bs_uid) ||
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get_user(bstat->bs_gid, &bstat32->bs_gid) ||
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get_user(bstat->bs_rdev, &bstat32->bs_rdev) ||
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get_user(bstat->bs_blksize, &bstat32->bs_blksize) ||
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get_user(bstat->bs_size, &bstat32->bs_size) ||
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xfs_ioctl32_bstime_copyin(&bstat->bs_atime, &bstat32->bs_atime) ||
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xfs_ioctl32_bstime_copyin(&bstat->bs_mtime, &bstat32->bs_mtime) ||
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xfs_ioctl32_bstime_copyin(&bstat->bs_ctime, &bstat32->bs_ctime) ||
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get_user(bstat->bs_blocks, &bstat32->bs_size) ||
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get_user(bstat->bs_xflags, &bstat32->bs_size) ||
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get_user(bstat->bs_extsize, &bstat32->bs_extsize) ||
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get_user(bstat->bs_extents, &bstat32->bs_extents) ||
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get_user(bstat->bs_gen, &bstat32->bs_gen) ||
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get_user(bstat->bs_projid_lo, &bstat32->bs_projid_lo) ||
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get_user(bstat->bs_projid_hi, &bstat32->bs_projid_hi) ||
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get_user(bstat->bs_forkoff, &bstat32->bs_forkoff) ||
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get_user(bstat->bs_dmevmask, &bstat32->bs_dmevmask) ||
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get_user(bstat->bs_dmstate, &bstat32->bs_dmstate) ||
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get_user(bstat->bs_aextents, &bstat32->bs_aextents))
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return -EFAULT;
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return 0;
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}
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/* XFS_IOC_FSBULKSTAT and friends */
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STATIC int
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xfs_bstime_store_compat(
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compat_xfs_bstime_t __user *p32,
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const xfs_bstime_t *p)
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{
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__s32 sec32;
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sec32 = p->tv_sec;
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if (put_user(sec32, &p32->tv_sec) ||
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put_user(p->tv_nsec, &p32->tv_nsec))
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return -EFAULT;
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return 0;
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}
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/* Return 0 on success or positive error (to xfs_bulkstat()) */
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STATIC int
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xfs_fsbulkstat_one_fmt_compat(
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struct xfs_ibulk *breq,
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const struct xfs_bulkstat *bstat)
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{
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struct compat_xfs_bstat __user *p32 = breq->ubuffer;
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struct xfs_bstat bs1;
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struct xfs_bstat *buffer = &bs1;
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xfs_bulkstat_to_bstat(breq->mp, &bs1, bstat);
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if (put_user(buffer->bs_ino, &p32->bs_ino) ||
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put_user(buffer->bs_mode, &p32->bs_mode) ||
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put_user(buffer->bs_nlink, &p32->bs_nlink) ||
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put_user(buffer->bs_uid, &p32->bs_uid) ||
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put_user(buffer->bs_gid, &p32->bs_gid) ||
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put_user(buffer->bs_rdev, &p32->bs_rdev) ||
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put_user(buffer->bs_blksize, &p32->bs_blksize) ||
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put_user(buffer->bs_size, &p32->bs_size) ||
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xfs_bstime_store_compat(&p32->bs_atime, &buffer->bs_atime) ||
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xfs_bstime_store_compat(&p32->bs_mtime, &buffer->bs_mtime) ||
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xfs_bstime_store_compat(&p32->bs_ctime, &buffer->bs_ctime) ||
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put_user(buffer->bs_blocks, &p32->bs_blocks) ||
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put_user(buffer->bs_xflags, &p32->bs_xflags) ||
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put_user(buffer->bs_extsize, &p32->bs_extsize) ||
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put_user(buffer->bs_extents, &p32->bs_extents) ||
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put_user(buffer->bs_gen, &p32->bs_gen) ||
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put_user(buffer->bs_projid, &p32->bs_projid) ||
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put_user(buffer->bs_projid_hi, &p32->bs_projid_hi) ||
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put_user(buffer->bs_forkoff, &p32->bs_forkoff) ||
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put_user(buffer->bs_dmevmask, &p32->bs_dmevmask) ||
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put_user(buffer->bs_dmstate, &p32->bs_dmstate) ||
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put_user(buffer->bs_aextents, &p32->bs_aextents))
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return -EFAULT;
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return xfs_ibulk_advance(breq, sizeof(struct compat_xfs_bstat));
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}
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/* copied from xfs_ioctl.c */
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STATIC int
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xfs_compat_ioc_fsbulkstat(
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struct file *file,
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unsigned int cmd,
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struct compat_xfs_fsop_bulkreq __user *p32)
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{
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struct xfs_mount *mp = XFS_I(file_inode(file))->i_mount;
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u32 addr;
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struct xfs_fsop_bulkreq bulkreq;
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struct xfs_ibulk breq = {
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.mp = mp,
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.mnt_userns = file_mnt_user_ns(file),
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.ocount = 0,
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};
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xfs_ino_t lastino;
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int error;
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/*
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* Output structure handling functions. Depending on the command,
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* either the xfs_bstat and xfs_inogrp structures are written out
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* to userpace memory via bulkreq.ubuffer. Normally the compat
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* functions and structure size are the correct ones to use ...
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*/
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inumbers_fmt_pf inumbers_func = xfs_fsinumbers_fmt_compat;
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bulkstat_one_fmt_pf bs_one_func = xfs_fsbulkstat_one_fmt_compat;
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#ifdef CONFIG_X86_X32
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if (in_x32_syscall()) {
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/*
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* ... but on x32 the input xfs_fsop_bulkreq has pointers
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* which must be handled in the "compat" (32-bit) way, while
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* the xfs_bstat and xfs_inogrp structures follow native 64-
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* bit layout convention. So adjust accordingly, otherwise
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* the data written out in compat layout will not match what
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* x32 userspace expects.
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*/
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inumbers_func = xfs_fsinumbers_fmt;
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bs_one_func = xfs_fsbulkstat_one_fmt;
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}
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#endif
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/* done = 1 if there are more stats to get and if bulkstat */
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/* should be called again (unused here, but used in dmapi) */
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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if (get_user(addr, &p32->lastip))
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return -EFAULT;
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bulkreq.lastip = compat_ptr(addr);
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if (get_user(bulkreq.icount, &p32->icount) ||
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get_user(addr, &p32->ubuffer))
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return -EFAULT;
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bulkreq.ubuffer = compat_ptr(addr);
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if (get_user(addr, &p32->ocount))
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return -EFAULT;
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bulkreq.ocount = compat_ptr(addr);
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if (copy_from_user(&lastino, bulkreq.lastip, sizeof(__s64)))
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return -EFAULT;
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if (bulkreq.icount <= 0)
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return -EINVAL;
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if (bulkreq.ubuffer == NULL)
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return -EINVAL;
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breq.ubuffer = bulkreq.ubuffer;
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breq.icount = bulkreq.icount;
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/*
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* FSBULKSTAT_SINGLE expects that *lastip contains the inode number
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* that we want to stat. However, FSINUMBERS and FSBULKSTAT expect
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* that *lastip contains either zero or the number of the last inode to
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* be examined by the previous call and return results starting with
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* the next inode after that. The new bulk request back end functions
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* take the inode to start with, so we have to compute the startino
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* parameter from lastino to maintain correct function. lastino == 0
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* is a special case because it has traditionally meant "first inode
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* in filesystem".
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*/
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if (cmd == XFS_IOC_FSINUMBERS_32) {
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breq.startino = lastino ? lastino + 1 : 0;
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error = xfs_inumbers(&breq, inumbers_func);
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lastino = breq.startino - 1;
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} else if (cmd == XFS_IOC_FSBULKSTAT_SINGLE_32) {
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breq.startino = lastino;
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breq.icount = 1;
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error = xfs_bulkstat_one(&breq, bs_one_func);
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lastino = breq.startino;
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} else if (cmd == XFS_IOC_FSBULKSTAT_32) {
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breq.startino = lastino ? lastino + 1 : 0;
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error = xfs_bulkstat(&breq, bs_one_func);
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lastino = breq.startino - 1;
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} else {
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error = -EINVAL;
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}
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if (error)
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return error;
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if (bulkreq.lastip != NULL &&
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copy_to_user(bulkreq.lastip, &lastino, sizeof(xfs_ino_t)))
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return -EFAULT;
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if (bulkreq.ocount != NULL &&
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copy_to_user(bulkreq.ocount, &breq.ocount, sizeof(__s32)))
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return -EFAULT;
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return 0;
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}
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STATIC int
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xfs_compat_handlereq_copyin(
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xfs_fsop_handlereq_t *hreq,
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compat_xfs_fsop_handlereq_t __user *arg32)
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{
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compat_xfs_fsop_handlereq_t hreq32;
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if (copy_from_user(&hreq32, arg32, sizeof(compat_xfs_fsop_handlereq_t)))
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return -EFAULT;
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hreq->fd = hreq32.fd;
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hreq->path = compat_ptr(hreq32.path);
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hreq->oflags = hreq32.oflags;
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hreq->ihandle = compat_ptr(hreq32.ihandle);
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hreq->ihandlen = hreq32.ihandlen;
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hreq->ohandle = compat_ptr(hreq32.ohandle);
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hreq->ohandlen = compat_ptr(hreq32.ohandlen);
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return 0;
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}
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STATIC struct dentry *
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xfs_compat_handlereq_to_dentry(
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struct file *parfilp,
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compat_xfs_fsop_handlereq_t *hreq)
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{
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return xfs_handle_to_dentry(parfilp,
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compat_ptr(hreq->ihandle), hreq->ihandlen);
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}
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STATIC int
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xfs_compat_attrlist_by_handle(
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struct file *parfilp,
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compat_xfs_fsop_attrlist_handlereq_t __user *p)
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{
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compat_xfs_fsop_attrlist_handlereq_t al_hreq;
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struct dentry *dentry;
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int error;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (copy_from_user(&al_hreq, p, sizeof(al_hreq)))
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return -EFAULT;
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dentry = xfs_compat_handlereq_to_dentry(parfilp, &al_hreq.hreq);
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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error = xfs_ioc_attr_list(XFS_I(d_inode(dentry)),
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compat_ptr(al_hreq.buffer), al_hreq.buflen,
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al_hreq.flags, &p->pos);
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dput(dentry);
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return error;
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}
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STATIC int
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xfs_compat_attrmulti_by_handle(
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struct file *parfilp,
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void __user *arg)
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{
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int error;
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compat_xfs_attr_multiop_t *ops;
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compat_xfs_fsop_attrmulti_handlereq_t am_hreq;
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struct dentry *dentry;
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unsigned int i, size;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (copy_from_user(&am_hreq, arg,
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sizeof(compat_xfs_fsop_attrmulti_handlereq_t)))
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return -EFAULT;
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/* overflow check */
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if (am_hreq.opcount >= INT_MAX / sizeof(compat_xfs_attr_multiop_t))
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return -E2BIG;
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dentry = xfs_compat_handlereq_to_dentry(parfilp, &am_hreq.hreq);
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if (IS_ERR(dentry))
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return PTR_ERR(dentry);
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error = -E2BIG;
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size = am_hreq.opcount * sizeof(compat_xfs_attr_multiop_t);
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if (!size || size > 16 * PAGE_SIZE)
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goto out_dput;
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ops = memdup_user(compat_ptr(am_hreq.ops), size);
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if (IS_ERR(ops)) {
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error = PTR_ERR(ops);
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goto out_dput;
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}
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error = 0;
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for (i = 0; i < am_hreq.opcount; i++) {
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ops[i].am_error = xfs_ioc_attrmulti_one(parfilp,
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d_inode(dentry), ops[i].am_opcode,
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compat_ptr(ops[i].am_attrname),
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compat_ptr(ops[i].am_attrvalue),
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&ops[i].am_length, ops[i].am_flags);
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}
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if (copy_to_user(compat_ptr(am_hreq.ops), ops, size))
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error = -EFAULT;
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kfree(ops);
|
|
out_dput:
|
|
dput(dentry);
|
|
return error;
|
|
}
|
|
|
|
long
|
|
xfs_file_compat_ioctl(
|
|
struct file *filp,
|
|
unsigned cmd,
|
|
unsigned long p)
|
|
{
|
|
struct inode *inode = file_inode(filp);
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
void __user *arg = compat_ptr(p);
|
|
int error;
|
|
|
|
trace_xfs_file_compat_ioctl(ip);
|
|
|
|
switch (cmd) {
|
|
#if defined(BROKEN_X86_ALIGNMENT)
|
|
case XFS_IOC_ALLOCSP_32:
|
|
case XFS_IOC_FREESP_32:
|
|
case XFS_IOC_ALLOCSP64_32:
|
|
case XFS_IOC_FREESP64_32: {
|
|
struct xfs_flock64 bf;
|
|
|
|
if (xfs_compat_flock64_copyin(&bf, arg))
|
|
return -EFAULT;
|
|
cmd = _NATIVE_IOC(cmd, struct xfs_flock64);
|
|
return xfs_ioc_space(filp, &bf);
|
|
}
|
|
case XFS_IOC_FSGEOMETRY_V1_32:
|
|
return xfs_compat_ioc_fsgeometry_v1(ip->i_mount, arg);
|
|
case XFS_IOC_FSGROWFSDATA_32: {
|
|
struct xfs_growfs_data in;
|
|
|
|
if (xfs_compat_growfs_data_copyin(&in, arg))
|
|
return -EFAULT;
|
|
error = mnt_want_write_file(filp);
|
|
if (error)
|
|
return error;
|
|
error = xfs_growfs_data(ip->i_mount, &in);
|
|
mnt_drop_write_file(filp);
|
|
return error;
|
|
}
|
|
case XFS_IOC_FSGROWFSRT_32: {
|
|
struct xfs_growfs_rt in;
|
|
|
|
if (xfs_compat_growfs_rt_copyin(&in, arg))
|
|
return -EFAULT;
|
|
error = mnt_want_write_file(filp);
|
|
if (error)
|
|
return error;
|
|
error = xfs_growfs_rt(ip->i_mount, &in);
|
|
mnt_drop_write_file(filp);
|
|
return error;
|
|
}
|
|
#endif
|
|
/* long changes size, but xfs only copiese out 32 bits */
|
|
case XFS_IOC_GETXFLAGS_32:
|
|
case XFS_IOC_SETXFLAGS_32:
|
|
case XFS_IOC_GETVERSION_32:
|
|
cmd = _NATIVE_IOC(cmd, long);
|
|
return xfs_file_ioctl(filp, cmd, p);
|
|
case XFS_IOC_SWAPEXT_32: {
|
|
struct xfs_swapext sxp;
|
|
struct compat_xfs_swapext __user *sxu = arg;
|
|
|
|
/* Bulk copy in up to the sx_stat field, then copy bstat */
|
|
if (copy_from_user(&sxp, sxu,
|
|
offsetof(struct xfs_swapext, sx_stat)) ||
|
|
xfs_ioctl32_bstat_copyin(&sxp.sx_stat, &sxu->sx_stat))
|
|
return -EFAULT;
|
|
error = mnt_want_write_file(filp);
|
|
if (error)
|
|
return error;
|
|
error = xfs_ioc_swapext(&sxp);
|
|
mnt_drop_write_file(filp);
|
|
return error;
|
|
}
|
|
case XFS_IOC_FSBULKSTAT_32:
|
|
case XFS_IOC_FSBULKSTAT_SINGLE_32:
|
|
case XFS_IOC_FSINUMBERS_32:
|
|
return xfs_compat_ioc_fsbulkstat(filp, cmd, arg);
|
|
case XFS_IOC_FD_TO_HANDLE_32:
|
|
case XFS_IOC_PATH_TO_HANDLE_32:
|
|
case XFS_IOC_PATH_TO_FSHANDLE_32: {
|
|
struct xfs_fsop_handlereq hreq;
|
|
|
|
if (xfs_compat_handlereq_copyin(&hreq, arg))
|
|
return -EFAULT;
|
|
cmd = _NATIVE_IOC(cmd, struct xfs_fsop_handlereq);
|
|
return xfs_find_handle(cmd, &hreq);
|
|
}
|
|
case XFS_IOC_OPEN_BY_HANDLE_32: {
|
|
struct xfs_fsop_handlereq hreq;
|
|
|
|
if (xfs_compat_handlereq_copyin(&hreq, arg))
|
|
return -EFAULT;
|
|
return xfs_open_by_handle(filp, &hreq);
|
|
}
|
|
case XFS_IOC_READLINK_BY_HANDLE_32: {
|
|
struct xfs_fsop_handlereq hreq;
|
|
|
|
if (xfs_compat_handlereq_copyin(&hreq, arg))
|
|
return -EFAULT;
|
|
return xfs_readlink_by_handle(filp, &hreq);
|
|
}
|
|
case XFS_IOC_ATTRLIST_BY_HANDLE_32:
|
|
return xfs_compat_attrlist_by_handle(filp, arg);
|
|
case XFS_IOC_ATTRMULTI_BY_HANDLE_32:
|
|
return xfs_compat_attrmulti_by_handle(filp, arg);
|
|
default:
|
|
/* try the native version */
|
|
return xfs_file_ioctl(filp, cmd, (unsigned long)arg);
|
|
}
|
|
}
|