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4d1b97f9ce
According to the glibc compat header for Irix 4, these ioctls originated
in April 1991 as a (somewhat clunky) way to preallocate space at the end
of a file on an EFS filesystem. XFS, which was released in Irix 5.3 in
December 1993, picked up these ioctls to maintain compatibility and they
were ported to Linux in the early 2000s.
Recently it was pointed out to me they still lurk in the kernel, even
though the Linux fallocate syscall supplanted the functionality a long
time ago. fstests doesn't seem to include any real functional or stress
tests for these ioctls, which means that the code quality is ... very
questionable. Most notably, it was a stale disk block exposure vector
for 21 years and nobody noticed or complained. As mature programmers
say, "If you're not testing it, it's broken."
Given all that, let's withdraw these ioctls from the XFS userspace API.
Normally we'd set a long deprecation process, but I estimate that there
aren't any real users, so let's trigger a warning in dmesg and return
-ENOTTY.
See: CVE-2021-4155
Augments: 983d8e60f5 ("xfs: map unwritten blocks in XFS_IOC_{ALLOC,FREE}SP just like fallocate")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2008 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_IOCTL_H__
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#define __XFS_IOCTL_H__
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struct xfs_bstat;
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struct xfs_ibulk;
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struct xfs_inogrp;
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int
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xfs_ioc_swapext(
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xfs_swapext_t *sxp);
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extern int
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xfs_find_handle(
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unsigned int cmd,
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xfs_fsop_handlereq_t *hreq);
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extern int
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xfs_open_by_handle(
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struct file *parfilp,
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xfs_fsop_handlereq_t *hreq);
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extern int
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xfs_readlink_by_handle(
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struct file *parfilp,
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xfs_fsop_handlereq_t *hreq);
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int xfs_ioc_attrmulti_one(struct file *parfilp, struct inode *inode,
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uint32_t opcode, void __user *uname, void __user *value,
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uint32_t *len, uint32_t flags);
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int xfs_ioc_attr_list(struct xfs_inode *dp, void __user *ubuf,
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size_t bufsize, int flags,
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struct xfs_attrlist_cursor __user *ucursor);
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extern struct dentry *
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xfs_handle_to_dentry(
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struct file *parfilp,
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void __user *uhandle,
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u32 hlen);
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extern int
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xfs_fileattr_get(
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struct dentry *dentry,
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struct fileattr *fa);
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extern int
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xfs_fileattr_set(
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struct user_namespace *mnt_userns,
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struct dentry *dentry,
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struct fileattr *fa);
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extern long
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xfs_file_ioctl(
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struct file *filp,
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unsigned int cmd,
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unsigned long p);
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extern long
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xfs_file_compat_ioctl(
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struct file *file,
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unsigned int cmd,
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unsigned long arg);
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int xfs_fsbulkstat_one_fmt(struct xfs_ibulk *breq,
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const struct xfs_bulkstat *bstat);
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int xfs_fsinumbers_fmt(struct xfs_ibulk *breq, const struct xfs_inumbers *igrp);
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#endif
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