Re: CVS commit: src

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

On which mailling list was this change discussed?

Joerg

On Tue, Dec 20, 2011 at 03:39:36PM +0000, Reinoud Zandijk wrote:
> Module Name:  src
> Committed By: reinoud
> Date:         Tue Dec 20 15:39:36 UTC 2011
> 
> Modified Files:
>       src/lib/libc/sys: mmap.2
>       src/sys/sys: mman.h proc.h
>       src/sys/uvm: uvm_extern.h uvm_map.c uvm_mmap.c
> 
> Log Message:
> Add a MAP_NOSYSCALLS flag to mmap. This flag prohibits executing of system
> calls from the mapped region. This can be used for emulation perposed or for
> extra security in the case of generated code.
> 
> Its implemented by adding mapping-attributes to each uvm_map_entry. These can
> then be queried when needed.
> 
> Currently the MAP_NOSYSCALLS is only implemented for x86 but other
> architectures are easy to adapt; see the sys/arch/x86/x86/syscall.c patch.
> Port maintainers are encouraged to add them for their processor ports too.
> When this feature is not yet implemented for an architecture the
> MAP_NOSYSCALLS is simply ignored with virtually no cpu cost..
> 
> 
> To generate a diff of this commit:
> cvs rdiff -u -r1.44 -r1.45 src/lib/libc/sys/mmap.2
> cvs rdiff -u -r1.42 -r1.43 src/sys/sys/mman.h
> cvs rdiff -u -r1.311 -r1.312 src/sys/sys/proc.h
> cvs rdiff -u -r1.176 -r1.177 src/sys/uvm/uvm_extern.h
> cvs rdiff -u -r1.307 -r1.308 src/sys/uvm/uvm_map.c
> cvs rdiff -u -r1.139 -r1.140 src/sys/uvm/uvm_mmap.c
> 
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.
>