[Bug nptl/10311] clone(CLONE_VM) fails with pthread_getattr_np on i386

["martinrb at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=10311

--- Comment #15 from Martin Buchholz <martinrb at google dot com> ---
(In reply to Rich Felker from comment #14)
> To elaborate on what Szabolcs Nagy said in #13 about using the shell, it can
> be done safely with no need for quoting on the caller side via something
> like (example for cd):
> 
> char *argv[] = { "sh", "-c", "cd \"$1\" && shift && exec \"$@\"", "sh", dir,
> prog, argv1, argv2, ..., 0 }

Using sh seems risky and insufficient.  Are you finding sh via user's PATH? 
Where is the POSIX version of sh?  Maybe it's /usr/xpg4/bin/sh ?!  Is cd
subject to the CDPATH environment variable?  What about closing file
descriptors? etc ...

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