linux-kernel - Re: [PATCH 2/2] arm64: bpf: add BPF XADD instruction

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, 11 Nov 2015 20:23:52 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Borkmann <daniel@...earbox.net>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	David Miller <davem@...emloft.net>, will.deacon@....com,
	arnd@...db.de, yang.shi@...aro.org, linaro-kernel@...ts.linaro.org,
	eric.dumazet@...il.com, zlim.lnx@...il.com, ast@...nel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	xi.wang@...il.com, catalin.marinas@....com,
	linux-arm-kernel@...ts.infradead.org, yhs@...mgrid.com,
	bblanco@...mgrid.com
Subject: Re: [PATCH 2/2] arm64: bpf: add BPF XADD instruction

On Wed, Nov 11, 2015 at 07:50:15PM +0100, Daniel Borkmann wrote:
> Well, on that note, it's not like you just change the target to bpf in your
> Makefile and can compile (& load into the kernel) anything you want with it.
> You do have to write small, restricted programs from scratch for a specific
> use-case with the limited set of helper functions and intrinsics that are
> available from the kernel. So I don't think that "Programs that used to work
> will now no longer work." holds if you regard it as such.

So I don't get this argument. If everything is so targeted, then why are
the BPF instructions an ABI.

If OTOH you're expected to be able to transfer these small proglets,
then too I would expect to transfer the source of these proglets.

You cannot argue both ways.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/