linux-kernel - Re: Q: selinux_bprm_committed_creds() && signals/do

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Message-Id: <20090501005018.63C12FC3BF@magilla.sf.frob.com>
Date:	Thu, 30 Apr 2009 17:50:18 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Eric Paris <eparis@...isplace.org>,
	James Morris <jmorris@...ei.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	linux-kernel@...r.kernel.org
Subject: Re: Q: selinux_bprm_committed_creds() && signals/do_wait

> I believe it's something to do with the binfmt driver needing to access files
> in the old security context between calling flush_old_exec() and calling
> install_exec_creds() [compute_creds() as was].  It can't do some of the
> accesses before calling flush_old_exec() because it has to do funky things
> with mmap().

This doesn't make too much sense to me off hand.  These accesses must
already be specially magical for unreadable setuid (--s) files to work.


Thanks,
Roland
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