@Claudio -- the execute permission bit on a directory is the 'traversal'
bit, without this bit a user is not permitted to pass through this
directory to open a file even if the file is readable.  That applied to
chdir() and getdents() equally, preventing a cd into the directory.
This behaviour seems as expected from the posix definition to my
reading.

** Changed in: linux (Ubuntu)
       Status: New => Invalid

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Andy Whitcroft (apw)

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Linux 2.6.32-15-generic does not correctly handle permissions
https://bugs.launchpad.net/bugs/531265
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