linux-kernel - Re: [PATCH v7 5/6] arm64: add SIGSYS siginfo for compat task

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Date:	Thu, 09 Oct 2014 11:25:54 +0900
From:	AKASHI Takahiro <takahiro.akashi@...aro.org>
To:	Will Deacon <will.deacon@....com>
CC:	"keescook@...omium.org" <keescook@...omium.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 v7 5/6] arm64: add SIGSYS siginfo for compat task

On 10/08/2014 11:30 PM, Will Deacon wrote:
> On Thu, Oct 02, 2014 at 10:46:15AM +0100, AKASHI Takahiro wrote:
>> SIGSYS is primarily used in secure computing to notify tracer.
>> This patch allows signal handler on compat task to get correct information
>> with SA_SIGINFO specified when this signal is delivered.
>>
>> Reviewed-by: Kees Cook <keescook@...omium.org>
>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
>> ---
>>   arch/arm64/include/asm/compat.h |    7 +++++++
>>   arch/arm64/kernel/signal32.c    |    6 ++++++
>>   2 files changed, 13 insertions(+)
>>
>> diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
>> index 253e33b..c877915 100644
>> --- a/arch/arm64/include/asm/compat.h
>> +++ b/arch/arm64/include/asm/compat.h
>> @@ -205,6 +205,13 @@ typedef struct compat_siginfo {
>>   			compat_long_t _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
>>   			int _fd;
>>   		} _sigpoll;
>> +
>> +		/* SIGSYS */
>> +		struct {
>> +			compat_uptr_t _call_addr; /* calling user insn */
>> +			int _syscall;	/* triggering system call number */
>> +			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
>
> nit, but compat_uint_t looks better here (I have no idea why I didn't do
> this for the signed int types, but hey).

I will fix it.

-Takahiro AKASHI

> Will
>
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