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78a7df6711
The length of a xmatch is used to prioritize multiple profiles that
match the same path, with the intent that the more specific match wins.
Currently, the length of a xmatch is computed by the position of the
first regex character.
While trying to work around issues with no_new_privs by combining
profiles, we noticed that the xmatch length computation doesn't work as
expected for multiple regexs. Consider the following two profiles:
profile all /** { }
profile bins /{,usr/,usr/local/}bin/** { }
xmatch_len is currently computed as "1" for both profiles, even though
"bins" is clearly more specific.
When determining the length of a regex, compute the smallest possible
match and use that for xmatch priority instead of the position of the
first regex character.
(cherry picked from commit cc09794fbd)
Signed-off-by: John Johansen <john.johansen@canonical.com>
The apparmor_parser allows you to add, replace, and remove AppArmor policy through the use of command line options. The default is to add. `apparmor_parser --help` shows what the command line options are. You can also find more information at https://wiki.apparmor.net -- The AppArmor development team