linux-kernel - Re: [RFC] status of execve() work - per-architecture patches solicited

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Message-ID: <20120919133226.GZ13973@ZenIV.linux.org.uk>
Date:	Wed, 19 Sep 2012 14:32:26 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] status of execve() work - per-architecture patches
 solicited

On Wed, Sep 19, 2012 at 05:50:34PM +0530, Vineet Gupta wrote:

> Hi Al,
> 
> It must be noted that despite having seemingly independent
> __ARCH_WANT_(KERNEL|SYS)_EXECVE, arches which have a kernel syscall trap
> based kernel_execve(), e.g. MIPS, can't implement __ARCH_WANT_SYS_EXECVE
> alone - they need to first convert
> to __ARCH_WANT_KERNEL_EXECVE as well (although it probably doesn't make
> sense for anyone to just implement one - but in terms of staging -
> having only one, breaks stuff IMHO).

Of course - that's the reason for kernel_execve() being pulled into the
mix at all.  Unified sys_execve() relies on not using a trap to do
kernel_execve(); it's not exactly the same thing as having it done
by generic instance in fs/exec.c (e.g. some architectures were already
doing it that way, with their own instances, some in asm glue, some
in C) but it is a prerequisite.
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