linux-kernel - Re: [PSEUDOPATCH] rename is_compat

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Message-ID: <20151208051505.GL20997@ZenIV.linux.org.uk>
Date:	Tue, 8 Dec 2015 05:15:05 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PSEUDOPATCH] rename is_compat_task

On Tue, Dec 08, 2015 at 06:01:48AM +0100, Ingo Molnar wrote:

> Hm, so if Sparc has no notion of compat-ness of the system call then how does it 
> implement runtime compat checks, such as AUDIT_ARCH et al?

Badly.  Things like compat_sys_ioctl() vs. ioctl() work (we use different
arrays of function pointers in 32bit and 64bit traps), but anything
dynamic assumes that things match the task.  Not that we had a lot of
such dynamic checks, actually...
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