cperciva at freebsd.org
Tue May 3 04:10:33 PDT 2005
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. :-)
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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