linux-kernel - Re: [PATCH] Make do_execve() take a const filename pointer

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Message-ID: <20100817152526.GC6681@flint.arm.linux.org.uk>
Date:	Tue, 17 Aug 2010 16:25:27 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	David Howells <dhowells@...hat.com>
Cc:	ralf@...ux-mips.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make do_execve() take a const filename pointer

On Tue, Aug 17, 2010 at 03:07:37PM +0100, David Howells wrote:
> Make do_execve() take a const filename pointer so that kernel_execve() compiles
> correctly on ARM:
> 
> arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type
> 
> This also requires the argv and envp arguments to be consted twice, once for
> the pointer array and once for the strings the array points to.  This is
> because do_execve() passes a pointer to the filename (now const) to
> copy_strings_kernel().  A simpler alternative would be to cast the filename
> pointer in do_execve() when it's passed to copy_strings_kernel().
> 
> do_execve() may not change any of the strings it is passed as part of the argv
> or envp lists as they are some of them in .rodata, so marking these strings as
> const should be fine.
> 
> Further kernel_execve() and sys_execve() need to be changed to match.
> 
> This has been test built on x86_64, frv, arm and mips.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> Tested-by: Ralf Baechle <ralf@...ux-mips.org>

David,

Thanks for sorting this.

Acked-by: Russell King <rmk+kernel@....linux.org.uk>

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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