linux-kernel - Re: [RFC PATCH net-next 2/6] x86: bpf_jit_comp: support BPF_S_ANC_SECCOMP_LD

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Message-ID: <CAKU6vyav+4e1RTKnpNRUJ64TO9AJWy2n2yY4rC-PKiqLei0rfw@mail.gmail.com>
Date:	Fri, 26 Apr 2013 12:02:04 -0400
From:	Xi Wang <xi.wang@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Daniel Borkmann <dborkman@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <linux@....linux.org.uk>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Will Drewry <wad@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 2/6] x86: bpf_jit_comp: support
 BPF_S_ANC_SECCOMP_LD_W instruction

On Fri, Apr 26, 2013 at 11:11 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 1) 'current' at the time the code is jitted (compiled) is not the
> 'current' at the time the filter will be evaluated.
>
> On x86_64, if CONFIG_IA32_EMULATION=y, syscall_get_arch() evaluates to :
>
> if (task_thread_info(task)->status & TS_COMPAT)
>         return AUDIT_ARCH_I386;
> return AUDIT_ARCH_X86_64;
>
> So your code is completely wrong.

Just to be clear, are you worrying about a process changing its
personality after installing seccomp filters?

- xi
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