Updating the mac system
Vulnerabilities that corrupt program memory often rely on known addresses for these library routines, which allow injected code to launch processes or change files.Library randomization is presumably a stepping-stone to a more complete implementation of address space layout randomization at a later date.It retailed for 9 Leopard was superseded by Snow Leopard (version 10.6).Leopard is the final version of Mac OS X to support the Power PC architecture as Snow Leopard functions solely on Intel based Macs.These computers only allow installation of Mac OS X Snow Leopard.Some ways of running Leopard on certain unsupported hardware, primarily Power PC G4 computers with CPU speeds lower than the official requirement of 867 MHz, have been discovered.Leopard is only compiled for Alti Vec-enabled Power PC processors (G4 and G5) though, as well as Intel, so both of these methods will only work on Macs with G4 or later CPUs.While some of the earlier beta releases were made to run on some later G3 machines (mostly later 800–900 MHz i Books), no success with the retail version has been officially reported on G3 Macs except for some later i Macs and "Pismo" Power Book G3s with G4 processor upgrades installed.
Of the two firewall engines, only the Application Layer Firewall is fully exposed in the Leopard user interface.
The new firewall offers less control over individual packet decisions (users can decide to allow or deny connections system wide or to individual applications, but must use IPFW to set fine-grained TCP/IP header-level policies).
It also makes several policy exceptions for system processes: neither m DNSResponder nor programs running with superuser privileges are filtered.
A common way is use of the program Leopard Assist, which is a bootloader similar in some respects to XPost Facto (used for installing earlier releases of Mac OS X on unsupported G3 and pre-G3 Macs) that uses the Mac’s Open Firmware to tell Leopard that the machine does have a CPU meeting the 867 MHz minimum requirement that the Installer checks for before installation is allowed to commence, when in reality the CPU is slower.
Currently, Leopard Assist only runs on slower G4s and many people have installed Leopard successfully on these older machines.