* Bob Proulx: > In those systems the zero page is initially bit-zero and reading from > the zero point will return zero values from the contents there. If > the program writes to the zero page then subsequent reads will return > whatever was written there. This is bad behavior that was the default > due to bugs in much legacy software. Unmapping the zero page will > cause those programs to segfault and therefore the vendors default to > having the page mapped to avoid support calls from their customers.
There is also an optimization which allows better code generation for loops over linked lists. But for that, a read-only mapping is sufficient. -- To UNSUBSCRIBE, email to debian-security-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/877gbuq0f3....@mid.deneb.enyo.de
