linux-kernel - Re: [bug] /etc/profile: line 30: /dev/null: Permission denied

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Date:	Fri, 18 Sep 2009 14:09:22 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Kay Sievers <kay.sievers@...y.org>, Ingo Molnar <mingo@...e.hu>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [bug] /etc/profile: line 30: /dev/null: Permission denied



On Fri, 18 Sep 2009, Eric W. Biederman wrote:
> 
> As a special case you can implement this much
> more simply in devtmpfs_mount just do:
> 
> int devtmpfs_mount(const char *mountpoint)
> {
>         sys_mount("none", "dev", "devtmpfs", MS_SILENT, NULL);
> 	sys_chmod("dev/console", 0666);
> 	sys_chmod("dev/tty", 0666);
> 	sys_chmod("dev/null", 0666);
> 	sys_chmod("dev/zero", 0666);
> }

Yeah, I think that's the way to go.

But add some error checking for sys_mount(), so that the code in question 
would _never_ try to do a chmod() on some unrelated /dev/ entries. 

(Ok, so the mount isn't supposed to fail, but still - conceptually that's 
a really important error to check for)

		Linus
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