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xfs: update ctime and remove suid before cloning files

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Before cloning into a file, update the ctime and remove sensitive
attributes like suid, just like we'd do for a regular file write.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2018-10-05 19:05:41 +10:00 committed by Dave Chinner
parent 410fdc72b0
commit 7debbf015f
1 changed files with 25 additions and 0 deletions
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25
fs/xfs/xfs_reflink.c
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@ -1264,6 +1264,7 @@ xfs_reflink_zero_posteof(
* Prepare two files for range cloning. Upon a successful return both inodes
* will have the iolock and mmaplock held, the page cache of the out file
* will be truncated, and any leases on the out file will have been broken.
* This function borrows heavily from xfs_file_aio_write_checks.
*/
STATIC int
xfs_reflink_remap_prep(
@ -1327,6 +1328,30 @@ xfs_reflink_remap_prep(
/* Zap any page cache for the destination file's range. */
truncate_inode_pages_range(&inode_out->i_data, pos_out,
PAGE_ALIGN(pos_out + *len) - 1);
/* If we're altering the file contents... */
if (!is_dedupe) {
/*
* ...update the timestamps (which will grab the ilock again
* from xfs_fs_dirty_inode, so we have to call it before we
* take the ilock).
*/
if (!(file_out->f_mode & FMODE_NOCMTIME)) {
ret = file_update_time(file_out);
if (ret)
goto out_unlock;
}
/*
* ...clear the security bits if the process is not being run
* by root. This keeps people from modifying setuid and setgid
* binaries.
*/
ret = file_remove_privs(file_out);
if (ret)
goto out_unlock;
}
return 1;
out_unlock:
xfs_reflink_remap_unlock(file_in, file_out);