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bptest
2004 Dec 07
1
Unprivileged user can write to mbr
Hi,
I'm having trouble rationalizing the behaviour described below. Is this
a security-issue (bug) or a feature?
- An unprivileged user 'bztest' with read-only access to /dev/ar0:
%id
uid=1004(bztest) gid=1004(test) groups=1004(test), 5(operator)
%ls -l /dev/ar0
crw-r----- 1 root operator 4, 21 Nov 23 17:34 /dev/ar0
- Now, the device ar0 has the standard mbr installed:
%cmp /dev/ar0 /boot/mbr
/dev/ar0 /boot/mbr differ: char 44...