Re: capabilities carried over execve()

["willy tarreau" <wtarreau@yahoo.fr>]

I personnaly use this simple patch which allows me
to keep caps over execve(). It allows me to give a
few more rights to some trusted users, such as 
kill, insmod... without risking unlink, chown or 
so. I couldn't find any other way to achieve this.

If needed, I can send you the complete prog which
sets the requested capabilities upon login, 
eventually asking for a password and limited in 
time of day.

Regards,
Willy

--- linux-2.2.18-wt11/fs/exec.c Fri Feb 16 23:11:52
2001
+++ linux-2.2.18-wt11+caps/fs/exec.c    Thu Feb 22
20:45:33 2001
@@ -702,7 +702,10 @@
        cap_clear(bprm->cap_inheritable);
        cap_clear(bprm->cap_permitted);
        cap_clear(bprm->cap_effective);
-
+/*** FIXME: just a test : keep permitted and
effective ******/
+bprm->cap_permitted =
cap_intersect(current->cap_inheritable,current->cap_permitted);
+bprm->cap_effective =
cap_intersect(current->cap_inheritable,current->cap_effective);
+/*** /FIXME ****/
        /*  To support inheritance of root-permissions
and suid-root
          *  executables under compatibility mode, we
raise all three
          *  capability sets for the file.



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