Add mimmutable(2) system call which locks the permissions (PROT_*) of
memory mappings so they cannot be changed by a later mmap(), mprotect(),
or munmap(), which will error with EPERM instead.
ok kettenis

Revert holding a read lock on the map while copying out data during sysctl(2).

This introduced a lock ordering issue reported by naddy@, anton@ and syzkaller.

Reported-by: syzbot+739bb901045d9b193bde@syzkaller.appspotmail.com

Hold a read lock on the map while copying out data during a sysctl(2) call
to prevent another thread from unmapping the memory and triggering
an assertion or even corrupting random physical memory pages.

This fix is similar to the change in uvm_glue.c rev. 1.74. However in this
case we need to be careful since some sysctl(2) calls look at the map of
the current process. In those cases we must not attempt to lock the map
again.

ok mpi@

Should fix:
Reported-by: syzbot+be89fe83d6c004fcb412@syzkaller.appspotmail.com

Sync some comments in order to reduce the difference with NetBSD.

No functionnal change.

ok kettenis@

Use uiomove(9) instead of uiomovei(9). From Martin Natano.

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

First step towards making uiomove() take a size_t size argument:
- rename uiomove() to uiomovei() and update all its users.
- introduce uiomove(), which is similar to uiomovei() but with a size_t.
- rewrite uiomovei() as an uiomove() wrapper.
ok kettenis@

remove uneeded proc.h includes
ok mpi@ kspillner@

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

compress code by turning four line comments into one line comments.
emphatic ok usual suspects, grudging ok miod

New vmmap implementation.

no oks (it is really a pain to review properly)
extensively tested, I'm confident it'll be stable
'now is the time' from several icb inhabitants

Diff provides:
- ability to specify different allocators for different regions/maps
- a simpler implementation of the current allocator
- currently in compatibility mode: it will generate similar addresses
as the old allocator

Backout vmmap in order to repair virtual address selection algorithms
outside the tree.

Reimplement uvm/uvm_map.

vmmap is designed to perform address space randomized allocations,
without letting fragmentation of the address space go through the roof.

Some highlights:
- kernel address space randomization
- proper implementation of guardpages
- roughly 10% system time reduction during kernel build

Tested by alot of people on tech@ and developers.
Theo's machines are still happy.

Add an extra argument to uvm_unmap_remove(), for the caller to tell it
whether removing holes or parts of them is allowed or not.
Only allow hole removal in uvmspace_free(), when tearing the vmspace down.

ok art@

Add an extra flags argument to uvm_io(), to specify whether we want to fix
the protection of the memory mapping we're doing I/O on, or if we want to
leave them as they are. This should only be necessary for breakpoint
insertion in code, so we'll only use it for ptrace requests.

Initially from art@ after discussion with kettenis@ millert@ and I,
tested by many.

add a new field to vm_space and use it to track the number of anon
pages a process uses. this is now the userland "data size" value.
ok art deraadt tdeval. thanks testers.

Since memory deallocation can't fail, remove the error return from
uvm_unmap, uvm_deallocate and a few other functions.
Simplifies some code and reduces diff to the UBC branch.

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.12.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Move the last content from vm/ to uvm/
The only thing left in vm/ are just dumb wrappers.
vm/vm.h includes uvm/uvm_extern.h
vm/pmap.h includes uvm/uvm_pmap.h
vm/vm_page.h includes uvm/uvm_page.h

Minor sync to NetBSD.

Avoid leaking memory if uiomove fails.

merge vm/vm_kern.h into uvm/uvm_extern.h; art@ ok

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled

Revert holding a read lock on the map while copying out data during sysctl(2).

This introduced a lock ordering issue reported by naddy@, anton@ and syzkaller.

Reported-by: syzbot+739bb901045d9b193bde@syzkaller.appspotmail.com

Hold a read lock on the map while copying out data during a sysctl(2) call
to prevent another thread from unmapping the memory and triggering
an assertion or even corrupting random physical memory pages.

This fix is similar to the change in uvm_glue.c rev. 1.74. However in this
case we need to be careful since some sysctl(2) calls look at the map of
the current process. In those cases we must not attempt to lock the map
again.

ok mpi@

Should fix:
Reported-by: syzbot+be89fe83d6c004fcb412@syzkaller.appspotmail.com

Sync some comments in order to reduce the difference with NetBSD.

No functionnal change.

ok kettenis@

Use uiomove(9) instead of uiomovei(9). From Martin Natano.

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

First step towards making uiomove() take a size_t size argument:
- rename uiomove() to uiomovei() and update all its users.
- introduce uiomove(), which is similar to uiomovei() but with a size_t.
- rewrite uiomovei() as an uiomove() wrapper.
ok kettenis@

remove uneeded proc.h includes
ok mpi@ kspillner@

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

compress code by turning four line comments into one line comments.
emphatic ok usual suspects, grudging ok miod

New vmmap implementation.

no oks (it is really a pain to review properly)
extensively tested, I'm confident it'll be stable
'now is the time' from several icb inhabitants

Diff provides:
- ability to specify different allocators for different regions/maps
- a simpler implementation of the current allocator
- currently in compatibility mode: it will generate similar addresses
as the old allocator

Backout vmmap in order to repair virtual address selection algorithms
outside the tree.

Reimplement uvm/uvm_map.

vmmap is designed to perform address space randomized allocations,
without letting fragmentation of the address space go through the roof.

Some highlights:
- kernel address space randomization
- proper implementation of guardpages
- roughly 10% system time reduction during kernel build

Tested by alot of people on tech@ and developers.
Theo's machines are still happy.

Add an extra argument to uvm_unmap_remove(), for the caller to tell it
whether removing holes or parts of them is allowed or not.
Only allow hole removal in uvmspace_free(), when tearing the vmspace down.

ok art@

Add an extra flags argument to uvm_io(), to specify whether we want to fix
the protection of the memory mapping we're doing I/O on, or if we want to
leave them as they are. This should only be necessary for breakpoint
insertion in code, so we'll only use it for ptrace requests.

Initially from art@ after discussion with kettenis@ millert@ and I,
tested by many.

add a new field to vm_space and use it to track the number of anon
pages a process uses. this is now the userland "data size" value.
ok art deraadt tdeval. thanks testers.

Since memory deallocation can't fail, remove the error return from
uvm_unmap, uvm_deallocate and a few other functions.
Simplifies some code and reduces diff to the UBC branch.

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.12.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Move the last content from vm/ to uvm/
The only thing left in vm/ are just dumb wrappers.
vm/vm.h includes uvm/uvm_extern.h
vm/pmap.h includes uvm/uvm_pmap.h
vm/vm_page.h includes uvm/uvm_page.h

Minor sync to NetBSD.

Avoid leaking memory if uiomove fails.

merge vm/vm_kern.h into uvm/uvm_extern.h; art@ ok

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled

Sync some comments in order to reduce the difference with NetBSD.

No functionnal change.

ok kettenis@

Use uiomove(9) instead of uiomovei(9). From Martin Natano.

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

First step towards making uiomove() take a size_t size argument:
- rename uiomove() to uiomovei() and update all its users.
- introduce uiomove(), which is similar to uiomovei() but with a size_t.
- rewrite uiomovei() as an uiomove() wrapper.
ok kettenis@

remove uneeded proc.h includes
ok mpi@ kspillner@

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

compress code by turning four line comments into one line comments.
emphatic ok usual suspects, grudging ok miod

New vmmap implementation.

no oks (it is really a pain to review properly)
extensively tested, I'm confident it'll be stable
'now is the time' from several icb inhabitants

Diff provides:
- ability to specify different allocators for different regions/maps
- a simpler implementation of the current allocator
- currently in compatibility mode: it will generate similar addresses
as the old allocator

Backout vmmap in order to repair virtual address selection algorithms
outside the tree.

Reimplement uvm/uvm_map.

vmmap is designed to perform address space randomized allocations,
without letting fragmentation of the address space go through the roof.

Some highlights:
- kernel address space randomization
- proper implementation of guardpages
- roughly 10% system time reduction during kernel build

Tested by alot of people on tech@ and developers.
Theo's machines are still happy.

Add an extra argument to uvm_unmap_remove(), for the caller to tell it
whether removing holes or parts of them is allowed or not.
Only allow hole removal in uvmspace_free(), when tearing the vmspace down.

ok art@

Add an extra flags argument to uvm_io(), to specify whether we want to fix
the protection of the memory mapping we're doing I/O on, or if we want to
leave them as they are. This should only be necessary for breakpoint
insertion in code, so we'll only use it for ptrace requests.

Initially from art@ after discussion with kettenis@ millert@ and I,
tested by many.

add a new field to vm_space and use it to track the number of anon
pages a process uses. this is now the userland "data size" value.
ok art deraadt tdeval. thanks testers.

Since memory deallocation can't fail, remove the error return from
uvm_unmap, uvm_deallocate and a few other functions.
Simplifies some code and reduces diff to the UBC branch.

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.12.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Move the last content from vm/ to uvm/
The only thing left in vm/ are just dumb wrappers.
vm/vm.h includes uvm/uvm_extern.h
vm/pmap.h includes uvm/uvm_pmap.h
vm/vm_page.h includes uvm/uvm_page.h

Minor sync to NetBSD.

Avoid leaking memory if uiomove fails.

merge vm/vm_kern.h into uvm/uvm_extern.h; art@ ok

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled

Use uiomove(9) instead of uiomovei(9). From Martin Natano.

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

First step towards making uiomove() take a size_t size argument:
- rename uiomove() to uiomovei() and update all its users.
- introduce uiomove(), which is similar to uiomovei() but with a size_t.
- rewrite uiomovei() as an uiomove() wrapper.
ok kettenis@

remove uneeded proc.h includes
ok mpi@ kspillner@

Chuck Cranor rescinded clauses in his license
on the 2nd of February 2011 in NetBSD.

http://marc.info/?l=netbsd-source-changes&m=129658899212732&w=2
http://marc.info/?l=netbsd-source-changes&m=129659095515558&w=2
http://marc.info/?l=netbsd-source-changes&m=129659157916514&w=2
http://marc.info/?l=netbsd-source-changes&m=129665962324372&w=2
http://marc.info/?l=netbsd-source-changes&m=129666033625342&w=2
http://marc.info/?l=netbsd-source-changes&m=129666052825545&w=2
http://marc.info/?l=netbsd-source-changes&m=129666922906480&w=2
http://marc.info/?l=netbsd-source-changes&m=129667725518082&w=2

compress code by turning four line comments into one line comments.
emphatic ok usual suspects, grudging ok miod

New vmmap implementation.

no oks (it is really a pain to review properly)
extensively tested, I'm confident it'll be stable
'now is the time' from several icb inhabitants

Diff provides:
- ability to specify different allocators for different regions/maps
- a simpler implementation of the current allocator
- currently in compatibility mode: it will generate similar addresses
as the old allocator

Backout vmmap in order to repair virtual address selection algorithms
outside the tree.

Reimplement uvm/uvm_map.

vmmap is designed to perform address space randomized allocations,
without letting fragmentation of the address space go through the roof.

Some highlights:
- kernel address space randomization
- proper implementation of guardpages
- roughly 10% system time reduction during kernel build

Tested by alot of people on tech@ and developers.
Theo's machines are still happy.

Add an extra argument to uvm_unmap_remove(), for the caller to tell it
whether removing holes or parts of them is allowed or not.
Only allow hole removal in uvmspace_free(), when tearing the vmspace down.

ok art@

Add an extra flags argument to uvm_io(), to specify whether we want to fix
the protection of the memory mapping we're doing I/O on, or if we want to
leave them as they are. This should only be necessary for breakpoint
insertion in code, so we'll only use it for ptrace requests.

Initially from art@ after discussion with kettenis@ millert@ and I,
tested by many.

add a new field to vm_space and use it to track the number of anon
pages a process uses. this is now the userland "data size" value.
ok art deraadt tdeval. thanks testers.

Since memory deallocation can't fail, remove the error return from
uvm_unmap, uvm_deallocate and a few other functions.
Simplifies some code and reduces diff to the UBC branch.

UBC was a disaster. It worked very good when it worked, but on some
machines or some configurations or in some phase of the moon (we actually
don't know when or why) files disappeared. Since we've not been able to
track down the problem in two weeks intense debugging and we need -current
to be stable, back out everything to a state it had before UBC.

We apologise for the inconvenience.

branches: 1.12.2;
Sync in more uvm from NetBSD. Mostly just cosmetic stuff.
Contains also support for page coloring.

Sync in more uvm changes from NetBSD.
This time we're getting rid of KERN_* and VM_PAGER_* error codes and
use errnos instead.

Move the last content from vm/ to uvm/
The only thing left in vm/ are just dumb wrappers.
vm/vm.h includes uvm/uvm_extern.h
vm/pmap.h includes uvm/uvm_pmap.h
vm/vm_page.h includes uvm/uvm_page.h

Minor sync to NetBSD.

Avoid leaking memory if uiomove fails.

merge vm/vm_kern.h into uvm/uvm_extern.h; art@ ok

Various random fixes from NetBSD.
Including support for zeroing pages in the idle loop (not enabled yet).

$OpenBSD$

Fix the NetBSD id strings.

branches: 1.3.4;
sync with NetBSD from 1999.05.24 (there is a reason for this date)
Mostly cleanups, but also a few improvements to pagedaemon for better
handling of low memory and/or low swap conditions.

add OpenBSD tags

Import of uvm from NetBSD. Some local changes, some code disabled