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11 Commits

Author SHA1 Message Date
Jonas 'Sortie' Termansen 2e3d7c45af Add paging no-execute and write protection support. 
Enable the NX bit on x86_64 and set if not PROT_EXEC and enable the write
protection mode (CR0.WP) that disables the default behavior where the kernel
is able to write to read-only memory. Fix kernel broken assumptions it can
access read-only memory and take care to never set PROT_KWRITE on user-space
pages unless PROT_WRITE is also set, otherwise user-space will be able to
write to read-only memory.

This achieves X^W in the whole system except for the core kernel itself as
it is currently don't know the purpose of pages when identity mapping the
first 4 MiB.
 2016-01-25 17:39:57 +01:00
Jonas 'Sortie' Termansen 4c2a93ea02 Fix munmap(2) shrink from right logic. 
This fixes a rather nasty issue where gcc's garbage collection triggered a
munmap call with the effect that it began unmapping huge amounts of kernel
data until the system triple faulted.
 2015-10-01 22:50:51 +02:00
Jonas 'Sortie' Termansen 77467b7768 Detect physical memory before initializing the kernel log. 2015-08-21 21:25:00 +02:00
Jonas 'Sortie' Termansen 9acc74de28 Fix read-only mmap with backing store. 2015-06-27 17:06:33 +02:00
Jonas 'Sortie' Termansen 5143f01b0a Remove sbrk(2). 
Note: This is an incompatible ABI change.
 2014-12-03 23:55:55 +01:00
Jonas 'Sortie' Termansen ba1e0882ec Initialize system call table at compile time. 2014-12-03 14:19:49 +01:00
Jonas 'Sortie' Termansen fbefc30229 Securely copy to and from user-space. 2014-12-02 15:35:50 +01:00
Jonas 'Sortie' Termansen 749d123331 Maintain counts of physical frames used for particular purposes. 2014-11-26 22:27:04 +01:00
Jonas 'Sortie' Termansen b4c38fd044 Fix wrong sizeof in memstat(2). 2014-10-18 15:30:11 +02:00
Jonas 'Sortie' Termansen 2d46c1e63c Fix missing TLB-flush in mprotect(). 2014-06-17 23:53:26 +02:00
Jonas 'Sortie' Termansen 98a87fa1e5 Rename Sortix kernel directory to kernel. 2014-03-01 14:37:39 +01:00
Renamed from sortix/memorymanagement.cpp (Browse further)