linux-kernel - Re: [PATCH v8 5/8] seccomp: Add SECCOMP_RET

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Message-ID: <CABqD9hbW_z-x7tgnBHPqVry=XLo+HDFtAhdXKHG+fxgn6fB6_g@mail.gmail.com>
Date:	Thu, 16 Feb 2012 15:33:47 -0600
From:	Will Drewry <wad@...omium.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Markus Gutschke <markus@...omium.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-doc@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	netdev@...r.kernel.org, x86@...nel.org, arnd@...db.de,
	davem@...emloft.net, mingo@...hat.com, oleg@...hat.com,
	peterz@...radead.org, rdunlap@...otime.net, mcgrathr@...omium.org,
	tglx@...utronix.de, luto@....edu, eparis@...hat.com,
	serge.hallyn@...onical.com, djm@...drot.org, scarybeasts@...il.com,
	indan@....nu, pmoore@...hat.com, akpm@...ux-foundation.org,
	corbet@....net, eric.dumazet@...il.com, keescook@...omium.org
Subject: Re: [PATCH v8 5/8] seccomp: Add SECCOMP_RET_TRAP

On Thu, Feb 16, 2012 at 3:28 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 02/16/2012 12:42 PM, Will Drewry wrote:
>> On Thu, Feb 16, 2012 at 2:24 PM, Markus Gutschke <markus@...omium.org> wrote:
>>> SIGTRAP might not be the ideal choice of signal number, as it can make it
>>> very difficult to debug the program in gdb.
>>
>> True enough.  In theory, we could use the lower 16-bits of the return
>> value to let the bpf program set a signal, but not all signals are
>> masked synchronous and those that are probably get gdb's attention,
>> just not a severely :) (ILL, SEGV, BUS, TRAP, FPE). Perhaps SIGILL is
>> a logically appropriate option -- or letting the api user decide from
>> the SYNCHRONOUS_MASK set.  I'm open to whatever makes sense, though.
>> (I wasn't even sure if it was kosher to add a new TRAP_SECCOMP value.)
>>
>
> There is a standard signal for this -- SIGSYS -- which happens to be
> currently unused in Linux.

Awesome.  I'll respin using that.
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