Re: [Qemu-devel] Make 9pfs buildable for Windows

[Michael Fritscher]

>> I see one thing: symlinks somewhere in the path (which seemed to be the
>> reason introducing the *at family). But I think that this can be handled
>> by canonlizing the path, too. realpath should do the job quite well.
>>
>
> Unfortunately now because we have TOCTOU condition here: some path element
> could be replaced by a symlink after realpath() but before we actually
> pass
> the resulting path to a syscall.
>

Hi,

my mistake was that thinking that O_NOFOLLOW prevents following any
symlink in the path, but it prevents only following if the pathname itself
is a symlink...

Best regards,
Michael Frischer