linux-kernel - Re: [PATCH] tile: use si_int instead of si_ptr for compat

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Message-ID: <55313B31.6040803@ezchip.com>
Date:	Fri, 17 Apr 2015 12:56:17 -0400
From:	Chris Metcalf <cmetcalf@...hip.com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	<linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	<ralf@...ux-mips.org>, <benh@...nel.crashing.org>, <deller@....de>,
	"dingtianhong@...wei.com" <dingtianhong@...wei.com>,
	<heiko.carstens@...ibm.com>, <jejb@...isc-linux.org>,
	Will Deacon <Will.Deacon@....com>,
	"lizefan@...wei.com" <lizefan@...wei.com>,
	Bamvor Jian Zhang <bamvor.zhangjian@...wei.com>,
	<mpe@...erman.id.au>, <hpa@...or.com>, <schwidefsky@...ibm.com>,
	<paulus@...ba.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<davem@...emloft.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] tile: use si_int instead of si_ptr for compat_siginfo

On 03/23/2015 08:02 AM, Catalin Marinas wrote:
>> @@ -121,8 +119,7 @@ int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
>> >  
>> >  	err |= __get_user(to->si_pid, &from->si_pid);
>> >  	err |= __get_user(to->si_uid, &from->si_uid);
>> >-	err |= __get_user(ptr32, &from->si_ptr);
>> >-	to->si_ptr = compat_ptr(ptr32);
>> >+	err |= __get_user(to->si_int, &from->si_int);
> We have a memset(to, 0, sizeof(*to)) on arm64 in this function but I
> can't see it on tile. Some members or even half of si_ptr would be left
> uninitialised.

In the end I added a memset() for the tile compat case like you suggest 
for arm64.

Thanks!

-- 
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com

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