Re: [Qemu-devel] [PATCH v4] file-posix: specify expected filetypes

[Kevin Wolf <kwolf@redhat.com>]

Am 13.03.2018 um 18:20 hat John Snow geschrieben:
> 
> 
> On 01/19/2018 06:03 PM, Eric Blake wrote:
> > On 01/19/2018 04:47 PM, John Snow wrote:
> >> Adjust each caller of raw_open_common to specify if they are expecting
> >> host and character devices or not. Tighten expectations of file types upon
> >> open in the common code and refuse types that are not expected.
> >>
> >> This has two effects:
> >>
> >> (1) Character and block devices are now considered deprecated for the
> >>     'file' driver, which expects only S_IFREG, and
> >> (2) no file-posix driver (file, host_cdrom, or host_device) can open
> >>     directories now.
> >>
> >> I don't think there's a legitimate reason to open directories as if
> >> they were files. This prevents QEMU from opening and attempting to probe
> >> a directory inode, which can break in exciting ways. One of those ways
> >> is lseek on ext4/xfs, which will return 0x7fffffffffffffff as the file
> >> size instead of EISDIR. This can coax QEMU into responding with a
> >> confusing "file too big" instead of "Hey, that's not a file".
> >>
> >> See: https://bugs.launchpad.net/qemu/+bug/1739304/
> >> Signed-off-by: John Snow <jsnow@redhat.com>
> >> ---
> > 
> > Reviewed-by: Eric Blake <eblake@redhat.com>
> 
> Whoops, I let this one rot. It could still be considered a bugfix for
> next week.

Yes, we should take this as a bugfix. Needs a rebase, though.

Kevin