Re: [PATCH v3] fs/fcntl: restore checking against COMPAT_LOFF_T_MAX for F_GETLK64

[Vitaly Lipatov]

Jeff Layton ÐÐÑÐÐ 14.11.17 22:12:
...
> Wait...
>
> Does this do anything at all in the case where you pass in
> COMPAT_LOFF_T_MAX? l_start and l_len are either off_t or loff_t
> (depending on arch).
>
> Either one will fit in the F_GETLK64/F_OFD_GETLK struct, so I don't see
> a need to check here.
I am not sure, can off_t be bigger than loff_t ?
If not, we have just skip checking against COMPAT_LOFF_T_MAX.

...
> > @@ -644,7 +644,7 @@ COMPAT_SYSCALL_DEFINE3(fcntl64, unsigned int, fd, 
> > unsigned int, cmd,
> >  		err = fcntl_getlk(f.file, convert_fcntl_cmd(cmd), &flock);
> >  		if (err)
> >  			break;
> > -		err = fixup_compat_flock(&flock);
> > +		err = fixup_compat_flock(&flock, COMPAT_LOFF_T_MAX);
> >  		if (err)
> >  			return err;
> >  		err = put_compat_flock64(&flock, compat_ptr(arg));
>
> Maybe a simpler fix would be to just remove the fixup_compat_flock call
> above?
>
> PS: if you send any more patches, please cc Christoph. He did the
Ok.

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