linux-kernel - Re: [PATCH] kconfig: place git SHA1 in .config output if in SCM

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Date:	Tue, 2 Mar 2010 18:16:24 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, zippel@...ux-m68k.org, mingo@...e.hu,
	akpm@...ux-foundation.org, geert@...ux-m68k.org, elendil@...net.nl,
	cloos@...loos.com
Subject: Re: [PATCH] kconfig: place git SHA1 in .config output if in SCM

On Tue, Mar 02, 2010 at 05:29:50PM -0800, Linus Torvalds wrote:
> 
> 
> On Tue, 2 Mar 2010, Paul E. McKenney wrote:
> > +		env = getenv(SRCTREE);
> > +		if (env) {
> > +			sprintf(cmdline,
> > +				"%s/scripts/setlocalversion %s 2> /dev/null",
> > +				env, env);
> > +			slv = popen(cmdline, "r");
> 
> I suspect this does various bad things if there are spaces or special 
> characters in $SRCTREE.
> 
> It would be a lot safer to uses fork/execve rather than something 
> that interprets a shell command line.
> 
> Of course, I didn't check that all our old users of SRCTREE are safe 
> either, but at least docproc.c (the one I _did_ check) uses 'execvp()' and 
> 'fopen()' that both take real filenames, not a shell string.

Well, we certainly don't want or need bash's "$", "``", and other
interpretations in this case.  I will update and send out a new patch.

Hmmm...  It has been one good long time since I have used pipe(), dup2(),
exec*(), and friends.  In happy contrast to last time, some of the man
pages now seem to have nice examples.  ;-)

							Thanx, Paul
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