yanefbsd at gmail.com
Sun Jun 29 03:06:19 UTC 2008
On Sat, Jun 28, 2008 at 6:13 PM, Ivaylo Mateev
<mateev at cns-consulting.org> wrote:
> I think I found a bug.
> [strato at darkstar /usr/home/strato]$ sudo sysctl kern.securelevel
> kern.securelevel: 2
> [strato at darkstar /usr/home/strato]$ kgdb
> kgdb: /dev/mem: Permission denied
> [strato at darkstar /usr/home/strato]$ sudo kgdb
> [GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:
> Undefined symbol "ps_pglobal_lookup"]
> GNU gdb 6.1.1 [FreeBSD]
> I am running in securelevel 2. That means nithing can have direct access
> to /dev/mem, acording to man security:
> 1 Secure mode - the system immutable and system append-only flags may
> not be turned off; disks for mounted file systems, /dev/mem and
> /dev/kmem may not be opened for writing; /dev/io (if your platform
> has it) may not be opened at all; kernel modules (see kld(4)) may
> not be loaded or unloaded.
> 2 Highly secure mode - same as secure mode, plus disks may not be
> opened for writing (except by mount(2)) whether mounted or not.
> This level precludes tampering with file systems by unmounting
> them, but also inhibits running newfs(8) while the system is multi-
> So is this a bug or I am just to stupid?
Same thing with su? In some situations sudo doesn't operate under 100%
More information about the freebsd-hackers