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| author | Amir Goldstein <amir73il@gmail.com> | 2017-01-31 08:34:56 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-12 09:51:26 (GMT) |
| commit | 27db1f020373a0681d483cc2d304e018cbd15723 (patch) | |
| tree | 82d6977d87a0fd212e9fd2b153cf085dbfda0bd6 /fs | |
| parent | ba15518c2610e777f141b55363b75f410eda7822 (diff) | |
| download | linux-27db1f020373a0681d483cc2d304e018cbd15723.tar.xz | |
vfs: deny copy_file_range() for non regular files
commit 11cbfb10775aa2a01cee966d118049ede9d0bdf2 upstream.
There is no in-tree file system that implements copy_file_range()
for non regular files.
Deny an attempt to copy_file_range() a directory with EISDIR
and any other non regualr file with EINVAL to conform with
behavior of vfs_{clone,dedup}_file_range().
This change is needed prior to converting sb_start_write()
to file_start_write() in the vfs helper.
Cc: linux-api@vger.kernel.org
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/read_write.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 09a8757..ba28059 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -1518,6 +1518,11 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, if (flags != 0) return -EINVAL; + if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) + return -EISDIR; + if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) + return -EINVAL; + ret = rw_verify_area(READ, file_in, &pos_in, len); if (unlikely(ret)) return ret; |