linux-kernel - Re: [PATCH v10 0/6] arm64: add seccomp support

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Date:	Mon, 1 Dec 2014 11:21:10 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Will Deacon <will.deacon@....com>
Cc:	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"arndb@...db.de" <arndb@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10 0/6] arm64: add seccomp support

On Fri, Nov 28, 2014 at 10:43 AM, Will Deacon <will.deacon@....com> wrote:
> On Fri, Nov 28, 2014 at 05:26:33AM +0000, AKASHI Takahiro wrote:
>> This patch series enables secure computing (system call filtering) on arm64,
>> and contains related enhancements and bug fixes.
>>
>>   NOTE: This versions contain a workaround against possible BUG_ON() failure
>>   at audit_syscall_exit(), but doesn't contain an extra optimization, as I
>>   submitted for arm, of excluding syscall enter/exit tracing against invalid
>>   system calls due to an issue that I reported in:
>>        http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/292170.html
>>
>> The code was tested on ARMv8 fast model with 64-bit/32-bit userspace using:
>>  * libseccomp v2.1.1 with modifications for arm64, especially its "live"
>>    tests: No.20, 21 and 24.
>>  * modified version of Kees' seccomp test for 'changing/skipping a syscall'
>>    and seccomp() system call
>>  * in-house tests for 'changing/skipping a system call' by tracing with
>>    ptrace(SETREGSET, NT_SYSTEM_CALL) (that is, not via seccomp filter)'
>> with and without audit tracing.
>>
>>
>> Changes v9 -> v10:
>> * modified system_call_get() for big-endian build [1/6]
>> * modified the way to check for syscall(-1) on syscall entry [2/6]
>
> Applied, thanks.

Yay! Thanks for all the revisions on this. I'll start preparing some
patches to use the generic seccomp.h file now...

-Kees

-- 
Kees Cook
Chrome OS Security
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