[ -r file ] falsely reports file to be readable

[Lasse Collin]

Description:
        Root doesn't always have permissions to read files as someone
        has assumed in function 'test_eaccess' in 'test.c'. This
        assumption breaks some shell scripts if the tested file is not
        actually readable, for example 'upgradepkg' in Slackware.

        This bug exists at least in bash versions 2.05b and 3.00.

Repeat-By:
        As a regular user create a file into NFS exported directory
        that has root_squash turned on in /etc/exports (the default
        setting). The directory should be accessible by all users
        (e.g. drwx-r-xr-x). chmod the created file to 0600 (-rw-------).

        Mount the NFS tree (if not already mounted). Try as root:

                # if [ -r /path/to/file ]; cat /path/to/file ; fi

        Shell says that it is readable but as root cannot read the file
        because of root_squash, cat fails.

Regards,
Lasse Collin