linux-kernel - Re: [PATCH 2/7] rename the provided execve functions to kernel

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Date:	Sun, 27 Aug 2006 19:20:30 -0700
From:	"Randy.Dunlap" <rdunlap@...otime.net>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Jeff Dike <jdike@...toit.com>,
	Bjoern Steinbrink <B.Steinbrink@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Chase Venters <chase.venters@...entec.com>,
	Andrew Morton <akpm@...l.org>,
	Russell King <rmk+lkml@....linux.org.uk>, rusty@...tcorp.com.au
Subject: Re: [PATCH 2/7] rename the provided execve functions to
 kernel_execve

On Sun, 27 Aug 2006 23:47:36 +0200 Arnd Bergmann wrote:

> --- linux-cg.orig/drivers/sbus/char/envctrl.c	2006-08-27 23:36:36.000000000 +0200
> +++ linux-cg/drivers/sbus/char/envctrl.c	2006-08-27 23:36:42.000000000 +0200
> @@ -19,9 +19,6 @@
>   *              Daniele Bellucci <bellucda@...cali.it>
>   */
>  
> -#define __KERNEL_SYSCALLS__
> -static int errno;
> -
>  #include <linux/module.h>
>  #include <linux/sched.h>
>  #include <linux/kthread.h>
> @@ -982,7 +979,7 @@
>  
>  	inprog = 1;
>  	printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n");
> -	if (0 > execve("/sbin/shutdown", argv, envp)) {
> +	if (0 > kernel_execve("/sbin/shutdown", argv, envp)) {
>  		printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n"); 
>  		inprog = 0;  /* unlikely to succeed, but we could try again */
>  	}

Linux just educated the git mailing list (yesterday) about ordering
of comparisons, so while here, please change the order inside the if()
to be like the others:
	if (kernel_execv(...) < 0)


> Index: linux-cg/include/linux/syscalls.h
> ===================================================================
> --- linux-cg.orig/include/linux/syscalls.h	2006-08-27 23:36:36.000000000 +0200
> +++ linux-cg/include/linux/syscalls.h	2006-08-27 23:36:42.000000000 +0200
> @@ -597,4 +597,6 @@
>  asmlinkage long sys_set_robust_list(struct robust_list_head __user *head,
>  				    size_t len);
>  
> +int kernel_execve(const char *filename, char *const argv[], char *const envp[]);
> +
>  #endif

Question:
All other syscalls (in syscalls.h) return long or unsigned long
or ssize_t etc.  I.e., none of them return int.  Does this one
return int because it's strictly an inside-the-kernel "syscall",
not exposed to userspace?


---
~Randy
-
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