netdev - Re: [PATCH 6/6] ebpf: allow BPF_REG_X in src

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20150905041249.GA2066@Alexeis-MBP-2.westell.com>
Date:	Fri, 4 Sep 2015 21:12:52 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Tycho Andersen <tycho.andersen@...onical.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Will Drewry <wad@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 6/6] ebpf: allow BPF_REG_X in src_reg conditional jumps

On Fri, Sep 04, 2015 at 04:43:50PM -0600, Tycho Andersen wrote:
> > The fix should be something like this:
> > diff --git a/net/core/filter.c b/net/core/filter.c
> > index 13079f03902e..05a04ea87172 100644
> > --- a/net/core/filter.c
> > +++ b/net/core/filter.c
> > @@ -478,9 +478,9 @@ do_pass:
> >                                 bpf_src = BPF_X;
> >                         } else {
> >                                 insn->dst_reg = BPF_REG_A;
> > -                               insn->src_reg = BPF_REG_X;
> >                                 insn->imm = fp->k;
> >                                 bpf_src = BPF_SRC(fp->code);
> > +                               insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
> >                         }
> 
> Yep, I just tested this and it works for me. Do you want to manage it
> or should I carry it as part of this set?

Though it's a bug, it doesn't affect anything at the moment
and not worth fixing in net, so please submit it as separate bug
fix when net-next reopens. imo the rest of the patches should
also go via net-next to minimize cross-tree conflicts.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html