linux-kernel - Re: [PATCH v2 1/6] audit: Enable arm64 support

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Date:	Mon, 27 Jan 2014 14:12:33 +0900
From:	AKASHI Takahiro <takahiro.akashi@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"eparis@...hat.com" <eparis@...hat.com>,
	"rgb@...hat.com" <rgb@...hat.com>,
	Will Deacon <Will.Deacon@....com>,
	"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>,
	"linux-audit@...hat.com" <linux-audit@...hat.com>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [PATCH v2 1/6] audit: Enable arm64 support

[To audit maintainers]

On 01/23/2014 11:18 PM, Catalin Marinas wrote:
> On Fri, Jan 17, 2014 at 08:13:14AM +0000, AKASHI Takahiro wrote:
>> --- a/include/uapi/linux/audit.h
>> +++ b/include/uapi/linux/audit.h
>> @@ -327,6 +327,8 @@ enum {
>>   /* distinguish syscall tables */
>>   #define __AUDIT_ARCH_64BIT 0x80000000
>>   #define __AUDIT_ARCH_LE	   0x40000000
>> +#define AUDIT_ARCH_AARCH64	(EM_AARCH64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
>> +#define AUDIT_ARCH_AARCH64EB	(EM_AARCH64|__AUDIT_ARCH_64BIT)
>>   #define AUDIT_ARCH_ALPHA	(EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
>>   #define AUDIT_ARCH_ARM		(EM_ARM|__AUDIT_ARCH_LE)
>>   #define AUDIT_ARCH_ARMEB	(EM_ARM)
>> diff --git a/init/Kconfig b/init/Kconfig
>> index 79383d3..3aae602 100644
>> --- a/init/Kconfig
>> +++ b/init/Kconfig
>> @@ -284,7 +284,7 @@ config AUDIT
>>
>>   config AUDITSYSCALL
>>   	bool "Enable system-call auditing support"
>> -	depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT))
>> +	depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT) || ARM64)
>
> The usual comment for such changes: could you please clean this up and
> just use something like "depends on HAVE_ARCH_AUDITSYSCALL"?

Do you agree to this change?

If so, I can create a patch, but have some concerns:
1) I can't verify it on other architectures than (arm &) arm64.
2) Some architectures (microblaze, mips, openrisc) are not listed here, but
    their ptrace.c have a call to audit_syscall_entry/exit().
    (audit_syscall_entry/exit are null if !AUDITSYSCALL, though)
So I'm afraid that the change might break someone's assumption.

Thanks,
-Takahiro AKASHI

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