Memory layout: Difference between revisions
No edit summary |
|||
| Line 56: | Line 56: | ||
PXN bit is set in the MMU descriptor for userland code pages. This means that userland code pages are not executable in kernel mode (equivalent to SMEP on x86). | PXN bit is set in the MMU descriptor for userland code pages. This means that userland code pages are not executable in kernel mode (equivalent to SMEP on x86). | ||
For userland pages, the kernel has same access as userland (either both are read-only or both are read-write). This rule has one exception: pages that are mapped unreadable in usermode are still forced readable from kernelmode. | For userland pages, the kernel has same access as userland (either both are read-only or both are read-write). This rule has one exception: pages that are mapped unreadable in usermode are still forced readable from kernelmode. Thus it does not have SMAP. | ||
As of [[2.0.0]] KASLR is not used. | As of [[2.0.0]] KASLR is not used. | ||