linux-kernel - Re: [PATCH v3 04/26] compat_ioctl: move PPPIOCSCOMPRESS32 to ppp-generic.c

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 17 Apr 2019 23:44:38 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        y2038 Mailman List <y2038@...ts.linaro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>, linux-ppp@...r.kernel.org,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 04/26] compat_ioctl: move PPPIOCSCOMPRESS32 to ppp-generic.c

On Wed, Apr 17, 2019 at 11:16 PM Al Viro <viro@...iv.linux.org.uk> wrote:
>
> On Tue, Apr 16, 2019 at 10:19:42PM +0200, Arnd Bergmann wrote:
> > +#ifdef CONFIG_COMPAT
> > +struct ppp_option_data32 {
> > +     compat_caddr_t  ptr;
>
> Huh?  compat_uptr_t, surely?  I realize that compat_ioctl.c is bogus
> that way right now, but let's not spread that crap into the places
> where it's harder to find...

Ok, done.

> >       err = -EFAULT;
> > -     if (copy_from_user(&data, (void __user *) arg, sizeof(data)))
> > -             goto out;
> > +#ifdef CONFIG_COMPAT
> > +     if (compat) {
> > +             struct ppp_option_data32 data32;
> > +
> > +             if (copy_from_user(&data32, (void __user *) arg,
> > +                                sizeof(data32)))
> > +                     goto out;
> > +
> > +             data.ptr = compat_ptr(data32.ptr);
> > +             data.length = data32.length;
> > +             data.transmit = data32.transmit;
> > +     } else
> > +#endif
> > +     {
> > +             if (copy_from_user(&data, (void __user *) arg, sizeof(data)))
> > +                     goto out;
> > +     }
>
> *UGH*
>
> Do that in caller, please.  And sod the flag argument...

Ack, changed it now.

      Arnd