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- Fix a potential infinite loop in FIEMAP by fixing an off by one error when comparing the requested range against s_maxbytes. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAmJEitIACgkQ+H93GTRK tOsgIxAAhUTopZ+ZZs/tLHlWj5wI9zBNCyIHVsb46GR/EyxpMhuAf7w+3qKuEV80 /oZwnpY82mYUtWimjdyuNsAusPwtX/YnuocVmeR3cMj5yynk4rxLX2zVbjUDvOFW BGIm2IXtNSsqYqIMiEs5M8WsAbDbJz3frdcfEQcFZ9qasLZl6lpwBg2pWuO65X1T UBNMbPcLS8I8OHuB9sVzgHnPlPZgj3VK1JJofzrXMG4+wbB5BpVO7suT/54N45/J LJohEH2uokGxvy9bYNeQT7ZLkxAlEQM8uxtjKa/G1f16IWIMqw/EwVTTDDpUekN0 6qQx6J5tPKbP/rZi7a7abDDD0mFgq7M/xggjbeX2C8gsgPMWGN4GdEdKs9SWPWNt emR7o0Pv9kIMHX4m2FUSLOdOoTAsJq84ujKNC0zk2wwOfIZ0PgxiQihYHp1NcoXk FCGUiIs0PaNxlZ58nuGp0ran2fq/RtaG+6OJRNxOChwRpRRqp3htfc8RK+7mci4X cUdDON3JdExd1+dPg2hnIrb4Tcbfsj4QfniXZBMg135+6N5r0upgpC5F9iR+kGDK RN7Ma6snVvnPmRWwzaC6PDoTI71N4sbHIkuoYOzdA+BikKfrJXm8PLLKfMf2IPEM lw7rEeJxWzWBIiG6IyBf5ybfxM1pdS/QNvfcYfYVIk06XwnApmE= =Lx1P -----END PGP SIGNATURE----- Merge tag 'vfs-5.18-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux Pull vfs fix from Darrick Wong: "The erofs developers felt that FIEMAP should handle ranged requests starting at s_maxbytes by returning EFBIG instead of passing the filesystem implementation a nonsense 0-byte request. Not sure why they keep tagging this 'iomap', but the VFS shouldn't be asking for information about ranges of a file that the filesystem already declared that it does not support. - Fix a potential infinite loop in FIEMAP by fixing an off by one error when comparing the requested range against s_maxbytes" * tag 'vfs-5.18-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: fs: fix an infinite loop in iomap_fiemap
979 lines
24 KiB
C
979 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ioctl.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <linux/syscalls.h>
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#include <linux/mm.h>
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#include <linux/capability.h>
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#include <linux/compat.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/security.h>
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#include <linux/export.h>
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#include <linux/uaccess.h>
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#include <linux/writeback.h>
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#include <linux/buffer_head.h>
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#include <linux/falloc.h>
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#include <linux/sched/signal.h>
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#include <linux/fiemap.h>
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#include <linux/mount.h>
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#include <linux/fscrypt.h>
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#include <linux/fileattr.h>
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#include "internal.h"
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#include <asm/ioctls.h>
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/* So that the fiemap access checks can't overflow on 32 bit machines. */
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#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
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/**
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* vfs_ioctl - call filesystem specific ioctl methods
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* @filp: open file to invoke ioctl method on
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* @cmd: ioctl command to execute
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* @arg: command-specific argument for ioctl
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*
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* Invokes filesystem specific ->unlocked_ioctl, if one exists; otherwise
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* returns -ENOTTY.
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*
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* Returns 0 on success, -errno on error.
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*/
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long vfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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int error = -ENOTTY;
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if (!filp->f_op->unlocked_ioctl)
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goto out;
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error = filp->f_op->unlocked_ioctl(filp, cmd, arg);
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if (error == -ENOIOCTLCMD)
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error = -ENOTTY;
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out:
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return error;
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}
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EXPORT_SYMBOL(vfs_ioctl);
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static int ioctl_fibmap(struct file *filp, int __user *p)
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{
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struct inode *inode = file_inode(filp);
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struct super_block *sb = inode->i_sb;
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int error, ur_block;
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sector_t block;
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if (!capable(CAP_SYS_RAWIO))
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return -EPERM;
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error = get_user(ur_block, p);
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if (error)
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return error;
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if (ur_block < 0)
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return -EINVAL;
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block = ur_block;
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error = bmap(inode, &block);
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if (block > INT_MAX) {
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error = -ERANGE;
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pr_warn_ratelimited("[%s/%d] FS: %s File: %pD4 would truncate fibmap result\n",
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current->comm, task_pid_nr(current),
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sb->s_id, filp);
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}
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if (error)
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ur_block = 0;
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else
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ur_block = block;
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if (put_user(ur_block, p))
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error = -EFAULT;
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return error;
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}
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/**
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* fiemap_fill_next_extent - Fiemap helper function
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* @fieinfo: Fiemap context passed into ->fiemap
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* @logical: Extent logical start offset, in bytes
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* @phys: Extent physical start offset, in bytes
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* @len: Extent length, in bytes
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* @flags: FIEMAP_EXTENT flags that describe this extent
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*
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* Called from file system ->fiemap callback. Will populate extent
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* info as passed in via arguments and copy to user memory. On
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* success, extent count on fieinfo is incremented.
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*
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* Returns 0 on success, -errno on error, 1 if this was the last
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* extent that will fit in user array.
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*/
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#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
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#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
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#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
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int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
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u64 phys, u64 len, u32 flags)
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{
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struct fiemap_extent extent;
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struct fiemap_extent __user *dest = fieinfo->fi_extents_start;
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/* only count the extents */
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if (fieinfo->fi_extents_max == 0) {
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fieinfo->fi_extents_mapped++;
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return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
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}
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if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
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return 1;
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if (flags & SET_UNKNOWN_FLAGS)
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flags |= FIEMAP_EXTENT_UNKNOWN;
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if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
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flags |= FIEMAP_EXTENT_ENCODED;
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if (flags & SET_NOT_ALIGNED_FLAGS)
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flags |= FIEMAP_EXTENT_NOT_ALIGNED;
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memset(&extent, 0, sizeof(extent));
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extent.fe_logical = logical;
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extent.fe_physical = phys;
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extent.fe_length = len;
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extent.fe_flags = flags;
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dest += fieinfo->fi_extents_mapped;
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if (copy_to_user(dest, &extent, sizeof(extent)))
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return -EFAULT;
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fieinfo->fi_extents_mapped++;
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if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
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return 1;
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return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
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}
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EXPORT_SYMBOL(fiemap_fill_next_extent);
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/**
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* fiemap_prep - check validity of requested flags for fiemap
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* @inode: Inode to operate on
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* @fieinfo: Fiemap context passed into ->fiemap
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* @start: Start of the mapped range
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* @len: Length of the mapped range, can be truncated by this function.
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* @supported_flags: Set of fiemap flags that the file system understands
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*
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* This function must be called from each ->fiemap instance to validate the
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* fiemap request against the file system parameters.
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*
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* Returns 0 on success, or a negative error on failure.
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*/
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int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo,
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u64 start, u64 *len, u32 supported_flags)
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{
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u64 maxbytes = inode->i_sb->s_maxbytes;
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u32 incompat_flags;
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int ret = 0;
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if (*len == 0)
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return -EINVAL;
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if (start >= maxbytes)
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return -EFBIG;
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/*
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* Shrink request scope to what the fs can actually handle.
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*/
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if (*len > maxbytes || (maxbytes - *len) < start)
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*len = maxbytes - start;
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supported_flags |= FIEMAP_FLAG_SYNC;
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supported_flags &= FIEMAP_FLAGS_COMPAT;
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incompat_flags = fieinfo->fi_flags & ~supported_flags;
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if (incompat_flags) {
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fieinfo->fi_flags = incompat_flags;
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return -EBADR;
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}
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if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC)
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ret = filemap_write_and_wait(inode->i_mapping);
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return ret;
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}
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EXPORT_SYMBOL(fiemap_prep);
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static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
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{
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struct fiemap fiemap;
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struct fiemap_extent_info fieinfo = { 0, };
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struct inode *inode = file_inode(filp);
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int error;
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if (!inode->i_op->fiemap)
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return -EOPNOTSUPP;
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if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
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return -EFAULT;
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if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
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return -EINVAL;
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fieinfo.fi_flags = fiemap.fm_flags;
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fieinfo.fi_extents_max = fiemap.fm_extent_count;
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fieinfo.fi_extents_start = ufiemap->fm_extents;
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error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
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fiemap.fm_length);
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fiemap.fm_flags = fieinfo.fi_flags;
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fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
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if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
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error = -EFAULT;
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return error;
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}
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static long ioctl_file_clone(struct file *dst_file, unsigned long srcfd,
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u64 off, u64 olen, u64 destoff)
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{
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struct fd src_file = fdget(srcfd);
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loff_t cloned;
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int ret;
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if (!src_file.file)
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return -EBADF;
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cloned = vfs_clone_file_range(src_file.file, off, dst_file, destoff,
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olen, 0);
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if (cloned < 0)
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ret = cloned;
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else if (olen && cloned != olen)
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ret = -EINVAL;
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else
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ret = 0;
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fdput(src_file);
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return ret;
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}
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static long ioctl_file_clone_range(struct file *file,
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struct file_clone_range __user *argp)
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{
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struct file_clone_range args;
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if (copy_from_user(&args, argp, sizeof(args)))
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return -EFAULT;
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return ioctl_file_clone(file, args.src_fd, args.src_offset,
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args.src_length, args.dest_offset);
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}
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/*
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* This provides compatibility with legacy XFS pre-allocation ioctls
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* which predate the fallocate syscall.
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*
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* Only the l_start, l_len and l_whence fields of the 'struct space_resv'
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* are used here, rest are ignored.
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*/
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static int ioctl_preallocate(struct file *filp, int mode, void __user *argp)
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{
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struct inode *inode = file_inode(filp);
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struct space_resv sr;
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if (copy_from_user(&sr, argp, sizeof(sr)))
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return -EFAULT;
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switch (sr.l_whence) {
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case SEEK_SET:
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break;
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case SEEK_CUR:
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sr.l_start += filp->f_pos;
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break;
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case SEEK_END:
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sr.l_start += i_size_read(inode);
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break;
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default:
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return -EINVAL;
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}
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return vfs_fallocate(filp, mode | FALLOC_FL_KEEP_SIZE, sr.l_start,
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sr.l_len);
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}
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/* on ia32 l_start is on a 32-bit boundary */
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#if defined CONFIG_COMPAT && defined(CONFIG_X86_64)
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/* just account for different alignment */
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static int compat_ioctl_preallocate(struct file *file, int mode,
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struct space_resv_32 __user *argp)
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{
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struct inode *inode = file_inode(file);
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struct space_resv_32 sr;
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if (copy_from_user(&sr, argp, sizeof(sr)))
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return -EFAULT;
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switch (sr.l_whence) {
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case SEEK_SET:
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break;
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case SEEK_CUR:
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sr.l_start += file->f_pos;
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break;
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case SEEK_END:
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sr.l_start += i_size_read(inode);
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break;
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default:
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return -EINVAL;
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}
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return vfs_fallocate(file, mode | FALLOC_FL_KEEP_SIZE, sr.l_start, sr.l_len);
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}
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#endif
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static int file_ioctl(struct file *filp, unsigned int cmd, int __user *p)
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{
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switch (cmd) {
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case FIBMAP:
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return ioctl_fibmap(filp, p);
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case FS_IOC_RESVSP:
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case FS_IOC_RESVSP64:
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return ioctl_preallocate(filp, 0, p);
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case FS_IOC_UNRESVSP:
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case FS_IOC_UNRESVSP64:
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return ioctl_preallocate(filp, FALLOC_FL_PUNCH_HOLE, p);
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case FS_IOC_ZERO_RANGE:
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return ioctl_preallocate(filp, FALLOC_FL_ZERO_RANGE, p);
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}
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return -ENOIOCTLCMD;
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}
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static int ioctl_fionbio(struct file *filp, int __user *argp)
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{
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unsigned int flag;
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int on, error;
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error = get_user(on, argp);
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if (error)
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return error;
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flag = O_NONBLOCK;
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#ifdef __sparc__
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/* SunOS compatibility item. */
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if (O_NONBLOCK != O_NDELAY)
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flag |= O_NDELAY;
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#endif
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spin_lock(&filp->f_lock);
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if (on)
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filp->f_flags |= flag;
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else
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filp->f_flags &= ~flag;
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spin_unlock(&filp->f_lock);
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return error;
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}
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static int ioctl_fioasync(unsigned int fd, struct file *filp,
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int __user *argp)
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{
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unsigned int flag;
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int on, error;
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error = get_user(on, argp);
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if (error)
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return error;
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flag = on ? FASYNC : 0;
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/* Did FASYNC state change ? */
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if ((flag ^ filp->f_flags) & FASYNC) {
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if (filp->f_op->fasync)
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/* fasync() adjusts filp->f_flags */
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error = filp->f_op->fasync(fd, filp, on);
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else
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error = -ENOTTY;
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}
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return error < 0 ? error : 0;
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}
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|
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static int ioctl_fsfreeze(struct file *filp)
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{
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struct super_block *sb = file_inode(filp)->i_sb;
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if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
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return -EPERM;
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|
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/* If filesystem doesn't support freeze feature, return. */
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if (sb->s_op->freeze_fs == NULL && sb->s_op->freeze_super == NULL)
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return -EOPNOTSUPP;
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|
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/* Freeze */
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if (sb->s_op->freeze_super)
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return sb->s_op->freeze_super(sb);
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return freeze_super(sb);
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}
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static int ioctl_fsthaw(struct file *filp)
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{
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struct super_block *sb = file_inode(filp)->i_sb;
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|
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if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
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return -EPERM;
|
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|
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/* Thaw */
|
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if (sb->s_op->thaw_super)
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return sb->s_op->thaw_super(sb);
|
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return thaw_super(sb);
|
|
}
|
|
|
|
static int ioctl_file_dedupe_range(struct file *file,
|
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struct file_dedupe_range __user *argp)
|
|
{
|
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struct file_dedupe_range *same = NULL;
|
|
int ret;
|
|
unsigned long size;
|
|
u16 count;
|
|
|
|
if (get_user(count, &argp->dest_count)) {
|
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ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
size = offsetof(struct file_dedupe_range, info[count]);
|
|
if (size > PAGE_SIZE) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
same = memdup_user(argp, size);
|
|
if (IS_ERR(same)) {
|
|
ret = PTR_ERR(same);
|
|
same = NULL;
|
|
goto out;
|
|
}
|
|
|
|
same->dest_count = count;
|
|
ret = vfs_dedupe_file_range(file, same);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = copy_to_user(argp, same, size);
|
|
if (ret)
|
|
ret = -EFAULT;
|
|
|
|
out:
|
|
kfree(same);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* fileattr_fill_xflags - initialize fileattr with xflags
|
|
* @fa: fileattr pointer
|
|
* @xflags: FS_XFLAG_* flags
|
|
*
|
|
* Set ->fsx_xflags, ->fsx_valid and ->flags (translated xflags). All
|
|
* other fields are zeroed.
|
|
*/
|
|
void fileattr_fill_xflags(struct fileattr *fa, u32 xflags)
|
|
{
|
|
memset(fa, 0, sizeof(*fa));
|
|
fa->fsx_valid = true;
|
|
fa->fsx_xflags = xflags;
|
|
if (fa->fsx_xflags & FS_XFLAG_IMMUTABLE)
|
|
fa->flags |= FS_IMMUTABLE_FL;
|
|
if (fa->fsx_xflags & FS_XFLAG_APPEND)
|
|
fa->flags |= FS_APPEND_FL;
|
|
if (fa->fsx_xflags & FS_XFLAG_SYNC)
|
|
fa->flags |= FS_SYNC_FL;
|
|
if (fa->fsx_xflags & FS_XFLAG_NOATIME)
|
|
fa->flags |= FS_NOATIME_FL;
|
|
if (fa->fsx_xflags & FS_XFLAG_NODUMP)
|
|
fa->flags |= FS_NODUMP_FL;
|
|
if (fa->fsx_xflags & FS_XFLAG_DAX)
|
|
fa->flags |= FS_DAX_FL;
|
|
if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
|
|
fa->flags |= FS_PROJINHERIT_FL;
|
|
}
|
|
EXPORT_SYMBOL(fileattr_fill_xflags);
|
|
|
|
/**
|
|
* fileattr_fill_flags - initialize fileattr with flags
|
|
* @fa: fileattr pointer
|
|
* @flags: FS_*_FL flags
|
|
*
|
|
* Set ->flags, ->flags_valid and ->fsx_xflags (translated flags).
|
|
* All other fields are zeroed.
|
|
*/
|
|
void fileattr_fill_flags(struct fileattr *fa, u32 flags)
|
|
{
|
|
memset(fa, 0, sizeof(*fa));
|
|
fa->flags_valid = true;
|
|
fa->flags = flags;
|
|
if (fa->flags & FS_SYNC_FL)
|
|
fa->fsx_xflags |= FS_XFLAG_SYNC;
|
|
if (fa->flags & FS_IMMUTABLE_FL)
|
|
fa->fsx_xflags |= FS_XFLAG_IMMUTABLE;
|
|
if (fa->flags & FS_APPEND_FL)
|
|
fa->fsx_xflags |= FS_XFLAG_APPEND;
|
|
if (fa->flags & FS_NODUMP_FL)
|
|
fa->fsx_xflags |= FS_XFLAG_NODUMP;
|
|
if (fa->flags & FS_NOATIME_FL)
|
|
fa->fsx_xflags |= FS_XFLAG_NOATIME;
|
|
if (fa->flags & FS_DAX_FL)
|
|
fa->fsx_xflags |= FS_XFLAG_DAX;
|
|
if (fa->flags & FS_PROJINHERIT_FL)
|
|
fa->fsx_xflags |= FS_XFLAG_PROJINHERIT;
|
|
}
|
|
EXPORT_SYMBOL(fileattr_fill_flags);
|
|
|
|
/**
|
|
* vfs_fileattr_get - retrieve miscellaneous file attributes
|
|
* @dentry: the object to retrieve from
|
|
* @fa: fileattr pointer
|
|
*
|
|
* Call i_op->fileattr_get() callback, if exists.
|
|
*
|
|
* Return: 0 on success, or a negative error on failure.
|
|
*/
|
|
int vfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
if (!inode->i_op->fileattr_get)
|
|
return -ENOIOCTLCMD;
|
|
|
|
return inode->i_op->fileattr_get(dentry, fa);
|
|
}
|
|
EXPORT_SYMBOL(vfs_fileattr_get);
|
|
|
|
/**
|
|
* copy_fsxattr_to_user - copy fsxattr to userspace.
|
|
* @fa: fileattr pointer
|
|
* @ufa: fsxattr user pointer
|
|
*
|
|
* Return: 0 on success, or -EFAULT on failure.
|
|
*/
|
|
int copy_fsxattr_to_user(const struct fileattr *fa, struct fsxattr __user *ufa)
|
|
{
|
|
struct fsxattr xfa;
|
|
|
|
memset(&xfa, 0, sizeof(xfa));
|
|
xfa.fsx_xflags = fa->fsx_xflags;
|
|
xfa.fsx_extsize = fa->fsx_extsize;
|
|
xfa.fsx_nextents = fa->fsx_nextents;
|
|
xfa.fsx_projid = fa->fsx_projid;
|
|
xfa.fsx_cowextsize = fa->fsx_cowextsize;
|
|
|
|
if (copy_to_user(ufa, &xfa, sizeof(xfa)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(copy_fsxattr_to_user);
|
|
|
|
static int copy_fsxattr_from_user(struct fileattr *fa,
|
|
struct fsxattr __user *ufa)
|
|
{
|
|
struct fsxattr xfa;
|
|
|
|
if (copy_from_user(&xfa, ufa, sizeof(xfa)))
|
|
return -EFAULT;
|
|
|
|
fileattr_fill_xflags(fa, xfa.fsx_xflags);
|
|
fa->fsx_extsize = xfa.fsx_extsize;
|
|
fa->fsx_nextents = xfa.fsx_nextents;
|
|
fa->fsx_projid = xfa.fsx_projid;
|
|
fa->fsx_cowextsize = xfa.fsx_cowextsize;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Generic function to check FS_IOC_FSSETXATTR/FS_IOC_SETFLAGS values and reject
|
|
* any invalid configurations.
|
|
*
|
|
* Note: must be called with inode lock held.
|
|
*/
|
|
static int fileattr_set_prepare(struct inode *inode,
|
|
const struct fileattr *old_ma,
|
|
struct fileattr *fa)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
|
|
* the relevant capability.
|
|
*/
|
|
if ((fa->flags ^ old_ma->flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
|
|
!capable(CAP_LINUX_IMMUTABLE))
|
|
return -EPERM;
|
|
|
|
err = fscrypt_prepare_setflags(inode, old_ma->flags, fa->flags);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* Project Quota ID state is only allowed to change from within the init
|
|
* namespace. Enforce that restriction only if we are trying to change
|
|
* the quota ID state. Everything else is allowed in user namespaces.
|
|
*/
|
|
if (current_user_ns() != &init_user_ns) {
|
|
if (old_ma->fsx_projid != fa->fsx_projid)
|
|
return -EINVAL;
|
|
if ((old_ma->fsx_xflags ^ fa->fsx_xflags) &
|
|
FS_XFLAG_PROJINHERIT)
|
|
return -EINVAL;
|
|
} else {
|
|
/*
|
|
* Caller is allowed to change the project ID. If it is being
|
|
* changed, make sure that the new value is valid.
|
|
*/
|
|
if (old_ma->fsx_projid != fa->fsx_projid &&
|
|
!projid_valid(make_kprojid(&init_user_ns, fa->fsx_projid)))
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check extent size hints. */
|
|
if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(inode->i_mode))
|
|
return -EINVAL;
|
|
|
|
if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) &&
|
|
!S_ISDIR(inode->i_mode))
|
|
return -EINVAL;
|
|
|
|
if ((fa->fsx_xflags & FS_XFLAG_COWEXTSIZE) &&
|
|
!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* It is only valid to set the DAX flag on regular files and
|
|
* directories on filesystems.
|
|
*/
|
|
if ((fa->fsx_xflags & FS_XFLAG_DAX) &&
|
|
!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
|
|
return -EINVAL;
|
|
|
|
/* Extent size hints of zero turn off the flags. */
|
|
if (fa->fsx_extsize == 0)
|
|
fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);
|
|
if (fa->fsx_cowextsize == 0)
|
|
fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vfs_fileattr_set - change miscellaneous file attributes
|
|
* @mnt_userns: user namespace of the mount
|
|
* @dentry: the object to change
|
|
* @fa: fileattr pointer
|
|
*
|
|
* After verifying permissions, call i_op->fileattr_set() callback, if
|
|
* exists.
|
|
*
|
|
* Verifying attributes involves retrieving current attributes with
|
|
* i_op->fileattr_get(), this also allows initializing attributes that have
|
|
* not been set by the caller to current values. Inode lock is held
|
|
* thoughout to prevent racing with another instance.
|
|
*
|
|
* Return: 0 on success, or a negative error on failure.
|
|
*/
|
|
int vfs_fileattr_set(struct user_namespace *mnt_userns, struct dentry *dentry,
|
|
struct fileattr *fa)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct fileattr old_ma = {};
|
|
int err;
|
|
|
|
if (!inode->i_op->fileattr_set)
|
|
return -ENOIOCTLCMD;
|
|
|
|
if (!inode_owner_or_capable(mnt_userns, inode))
|
|
return -EPERM;
|
|
|
|
inode_lock(inode);
|
|
err = vfs_fileattr_get(dentry, &old_ma);
|
|
if (!err) {
|
|
/* initialize missing bits from old_ma */
|
|
if (fa->flags_valid) {
|
|
fa->fsx_xflags |= old_ma.fsx_xflags & ~FS_XFLAG_COMMON;
|
|
fa->fsx_extsize = old_ma.fsx_extsize;
|
|
fa->fsx_nextents = old_ma.fsx_nextents;
|
|
fa->fsx_projid = old_ma.fsx_projid;
|
|
fa->fsx_cowextsize = old_ma.fsx_cowextsize;
|
|
} else {
|
|
fa->flags |= old_ma.flags & ~FS_COMMON_FL;
|
|
}
|
|
err = fileattr_set_prepare(inode, &old_ma, fa);
|
|
if (!err)
|
|
err = inode->i_op->fileattr_set(mnt_userns, dentry, fa);
|
|
}
|
|
inode_unlock(inode);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(vfs_fileattr_set);
|
|
|
|
static int ioctl_getflags(struct file *file, unsigned int __user *argp)
|
|
{
|
|
struct fileattr fa = { .flags_valid = true }; /* hint only */
|
|
int err;
|
|
|
|
err = vfs_fileattr_get(file->f_path.dentry, &fa);
|
|
if (!err)
|
|
err = put_user(fa.flags, argp);
|
|
return err;
|
|
}
|
|
|
|
static int ioctl_setflags(struct file *file, unsigned int __user *argp)
|
|
{
|
|
struct user_namespace *mnt_userns = file_mnt_user_ns(file);
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
struct fileattr fa;
|
|
unsigned int flags;
|
|
int err;
|
|
|
|
err = get_user(flags, argp);
|
|
if (!err) {
|
|
err = mnt_want_write_file(file);
|
|
if (!err) {
|
|
fileattr_fill_flags(&fa, flags);
|
|
err = vfs_fileattr_set(mnt_userns, dentry, &fa);
|
|
mnt_drop_write_file(file);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int ioctl_fsgetxattr(struct file *file, void __user *argp)
|
|
{
|
|
struct fileattr fa = { .fsx_valid = true }; /* hint only */
|
|
int err;
|
|
|
|
err = vfs_fileattr_get(file->f_path.dentry, &fa);
|
|
if (!err)
|
|
err = copy_fsxattr_to_user(&fa, argp);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ioctl_fssetxattr(struct file *file, void __user *argp)
|
|
{
|
|
struct user_namespace *mnt_userns = file_mnt_user_ns(file);
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
struct fileattr fa;
|
|
int err;
|
|
|
|
err = copy_fsxattr_from_user(&fa, argp);
|
|
if (!err) {
|
|
err = mnt_want_write_file(file);
|
|
if (!err) {
|
|
err = vfs_fileattr_set(mnt_userns, dentry, &fa);
|
|
mnt_drop_write_file(file);
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
|
|
* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
|
|
*
|
|
* When you add any new common ioctls to the switches above and below,
|
|
* please ensure they have compatible arguments in compat mode.
|
|
*/
|
|
static int do_vfs_ioctl(struct file *filp, unsigned int fd,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
struct inode *inode = file_inode(filp);
|
|
|
|
switch (cmd) {
|
|
case FIOCLEX:
|
|
set_close_on_exec(fd, 1);
|
|
return 0;
|
|
|
|
case FIONCLEX:
|
|
set_close_on_exec(fd, 0);
|
|
return 0;
|
|
|
|
case FIONBIO:
|
|
return ioctl_fionbio(filp, argp);
|
|
|
|
case FIOASYNC:
|
|
return ioctl_fioasync(fd, filp, argp);
|
|
|
|
case FIOQSIZE:
|
|
if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
|
|
S_ISLNK(inode->i_mode)) {
|
|
loff_t res = inode_get_bytes(inode);
|
|
return copy_to_user(argp, &res, sizeof(res)) ?
|
|
-EFAULT : 0;
|
|
}
|
|
|
|
return -ENOTTY;
|
|
|
|
case FIFREEZE:
|
|
return ioctl_fsfreeze(filp);
|
|
|
|
case FITHAW:
|
|
return ioctl_fsthaw(filp);
|
|
|
|
case FS_IOC_FIEMAP:
|
|
return ioctl_fiemap(filp, argp);
|
|
|
|
case FIGETBSZ:
|
|
/* anon_bdev filesystems may not have a block size */
|
|
if (!inode->i_sb->s_blocksize)
|
|
return -EINVAL;
|
|
|
|
return put_user(inode->i_sb->s_blocksize, (int __user *)argp);
|
|
|
|
case FICLONE:
|
|
return ioctl_file_clone(filp, arg, 0, 0, 0);
|
|
|
|
case FICLONERANGE:
|
|
return ioctl_file_clone_range(filp, argp);
|
|
|
|
case FIDEDUPERANGE:
|
|
return ioctl_file_dedupe_range(filp, argp);
|
|
|
|
case FIONREAD:
|
|
if (!S_ISREG(inode->i_mode))
|
|
return vfs_ioctl(filp, cmd, arg);
|
|
|
|
return put_user(i_size_read(inode) - filp->f_pos,
|
|
(int __user *)argp);
|
|
|
|
case FS_IOC_GETFLAGS:
|
|
return ioctl_getflags(filp, argp);
|
|
|
|
case FS_IOC_SETFLAGS:
|
|
return ioctl_setflags(filp, argp);
|
|
|
|
case FS_IOC_FSGETXATTR:
|
|
return ioctl_fsgetxattr(filp, argp);
|
|
|
|
case FS_IOC_FSSETXATTR:
|
|
return ioctl_fssetxattr(filp, argp);
|
|
|
|
default:
|
|
if (S_ISREG(inode->i_mode))
|
|
return file_ioctl(filp, cmd, argp);
|
|
break;
|
|
}
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, unsigned long, arg)
|
|
{
|
|
struct fd f = fdget(fd);
|
|
int error;
|
|
|
|
if (!f.file)
|
|
return -EBADF;
|
|
|
|
error = security_file_ioctl(f.file, cmd, arg);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = do_vfs_ioctl(f.file, fd, cmd, arg);
|
|
if (error == -ENOIOCTLCMD)
|
|
error = vfs_ioctl(f.file, cmd, arg);
|
|
|
|
out:
|
|
fdput(f);
|
|
return error;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
/**
|
|
* compat_ptr_ioctl - generic implementation of .compat_ioctl file operation
|
|
*
|
|
* This is not normally called as a function, but instead set in struct
|
|
* file_operations as
|
|
*
|
|
* .compat_ioctl = compat_ptr_ioctl,
|
|
*
|
|
* On most architectures, the compat_ptr_ioctl() just passes all arguments
|
|
* to the corresponding ->ioctl handler. The exception is arch/s390, where
|
|
* compat_ptr() clears the top bit of a 32-bit pointer value, so user space
|
|
* pointers to the second 2GB alias the first 2GB, as is the case for
|
|
* native 32-bit s390 user space.
|
|
*
|
|
* The compat_ptr_ioctl() function must therefore be used only with ioctl
|
|
* functions that either ignore the argument or pass a pointer to a
|
|
* compatible data type.
|
|
*
|
|
* If any ioctl command handled by fops->unlocked_ioctl passes a plain
|
|
* integer instead of a pointer, or any of the passed data types
|
|
* is incompatible between 32-bit and 64-bit architectures, a proper
|
|
* handler is required instead of compat_ptr_ioctl.
|
|
*/
|
|
long compat_ptr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
if (!file->f_op->unlocked_ioctl)
|
|
return -ENOIOCTLCMD;
|
|
|
|
return file->f_op->unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
|
|
}
|
|
EXPORT_SYMBOL(compat_ptr_ioctl);
|
|
|
|
COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd,
|
|
compat_ulong_t, arg)
|
|
{
|
|
struct fd f = fdget(fd);
|
|
int error;
|
|
|
|
if (!f.file)
|
|
return -EBADF;
|
|
|
|
/* RED-PEN how should LSM module know it's handling 32bit? */
|
|
error = security_file_ioctl(f.file, cmd, arg);
|
|
if (error)
|
|
goto out;
|
|
|
|
switch (cmd) {
|
|
/* FICLONE takes an int argument, so don't use compat_ptr() */
|
|
case FICLONE:
|
|
error = ioctl_file_clone(f.file, arg, 0, 0, 0);
|
|
break;
|
|
|
|
#if defined(CONFIG_X86_64)
|
|
/* these get messy on amd64 due to alignment differences */
|
|
case FS_IOC_RESVSP_32:
|
|
case FS_IOC_RESVSP64_32:
|
|
error = compat_ioctl_preallocate(f.file, 0, compat_ptr(arg));
|
|
break;
|
|
case FS_IOC_UNRESVSP_32:
|
|
case FS_IOC_UNRESVSP64_32:
|
|
error = compat_ioctl_preallocate(f.file, FALLOC_FL_PUNCH_HOLE,
|
|
compat_ptr(arg));
|
|
break;
|
|
case FS_IOC_ZERO_RANGE_32:
|
|
error = compat_ioctl_preallocate(f.file, FALLOC_FL_ZERO_RANGE,
|
|
compat_ptr(arg));
|
|
break;
|
|
#endif
|
|
|
|
/*
|
|
* These access 32-bit values anyway so no further handling is
|
|
* necessary.
|
|
*/
|
|
case FS_IOC32_GETFLAGS:
|
|
case FS_IOC32_SETFLAGS:
|
|
cmd = (cmd == FS_IOC32_GETFLAGS) ?
|
|
FS_IOC_GETFLAGS : FS_IOC_SETFLAGS;
|
|
fallthrough;
|
|
/*
|
|
* everything else in do_vfs_ioctl() takes either a compatible
|
|
* pointer argument or no argument -- call it with a modified
|
|
* argument.
|
|
*/
|
|
default:
|
|
error = do_vfs_ioctl(f.file, fd, cmd,
|
|
(unsigned long)compat_ptr(arg));
|
|
if (error != -ENOIOCTLCMD)
|
|
break;
|
|
|
|
if (f.file->f_op->compat_ioctl)
|
|
error = f.file->f_op->compat_ioctl(f.file, cmd, arg);
|
|
if (error == -ENOIOCTLCMD)
|
|
error = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
out:
|
|
fdput(f);
|
|
|
|
return error;
|
|
}
|
|
#endif
|