Date: Tue, 03 May 2005 04:10:18 -0700 From: Colin Percival <cperciva@freebsd.org> To: Danny Braniss <danny@cs.huji.ac.il> Cc: current@freebsd.org Subject: Re: MNT_USER? Message-ID: <42775C1A.2080400@freebsd.org> In-Reply-To: <E1DSv8D-000EwW-37@cs1.cs.huji.ac.il> References: <E1DSv8D-000EwW-37@cs1.cs.huji.ac.il>
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Danny Braniss wrote: > BTW, this, the MNT_NOEXEC, uncovered, IMHO, a bug in libexec/rtld-elf/rtld.c > where it's now checking for MNT_NOEXEC, but only if LD_LIBRARY_PATH is set! This is not a bug. Checking for MNT_NOEXEC adds a cost in performance, and it is not necessary if LD_LIBRARY_PATH, LD_PRELOAD, and LD_LIBMAP* are not set -- based on the assumption, that is, that no (sane) sysadmin would ever put a MNT_NOEXEC-mounted filesystem into the default library path. I agree that it's a bit counter-intuitive, but it's really just a case of saving time by not checking for something which should Never Happen. :-) Colin Percival PS. Bravo to Ian for tracking down the bug in NFS -- I spent a while looking for this, but got hopelessly lost.
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