sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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LinuxKPI: Implement ksize() function.

In Linux, ksize() gets the actual amount of memory allocated for a given
object. This commit adds malloc_usable_size() to FreeBSD KPI which does
the same. It al

LinuxKPI: Implement ksize() function.

In Linux, ksize() gets the actual amount of memory allocated for a given
object. This commit adds malloc_usable_size() to FreeBSD KPI which does
the same. It also maps LinuxKPI ksize() to newly created function.

ksize() function is used by drm-kmod.

Reviewed by: hselasky, kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D26215

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sys: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
pro

sys: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

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Merge head r233826 through r256722.

IFC @256277

Approved by: ken (mentor)

IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.

Merge from head

IFC @ r255209

Replace kernel virtual address space allocation with vmem. This provides
transparent layering and better fragmentation.

- Normalize functions that allocate memory to use kmem_*
- Those that alloc

Replace kernel virtual address space allocation with vmem. This provides
transparent layering and better fragmentation.

- Normalize functions that allocate memory to use kmem_*
- Those that allocate address space are named kva_*
- Those that operate on maps are named kmap_*
- Implement recursive allocation handling for kmem_arena in vmem.

Reviewed by: alc
Tested by: pho
Sponsored by: EMC / Isilon Storage Division

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MFC @ r241285

IFC @ r242684

Sync from head

Merge head r233826 through r239010.

Fix a bug with memguard(9) on 32-bit architectures without a
VM_KMEM_MAX_SIZE.

The code was not taking into account the size of the kernel_map, which
the kmem_map is allocated from, so it could prod

Fix a bug with memguard(9) on 32-bit architectures without a
VM_KMEM_MAX_SIZE.

The code was not taking into account the size of the kernel_map, which
the kmem_map is allocated from, so it could produce a sub-map size too
large to fit. The simplest solution is to ignore VM_KMEM_MAX entirely
and base the memguard map's size off the kernel_map's size, since this
is always relevant and always smaller.

Found by: Justin Hibbits

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IFC @230489 (pending review).

IFC @ r226824

Make memguard(9) capable to guard uma(9) allocations.

Merge svn+ssh://svn.freebsd.org/base/head@214309

The realloc case for memguard(9) will copy too many bytes when
reallocating to a smaller-sized allocation. Fix this issue.

Noticed by: alc
Reviewed by: alc
Approved by: zml (mentor)
MFC a

The realloc case for memguard(9) will copy too many bytes when
reallocating to a smaller-sized allocation. Fix this issue.

Noticed by: alc
Reviewed by: alc
Approved by: zml (mentor)
MFC after: 3 weeks

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Merge svn+ssh://svn.freebsd.org/base/head@211344

Fix compile. It seemed better to have memguard.c include opt_vm.h in
case future compile-time knobs were added that it wants to use.
Also add include guards and forward declarations to vm/memguard.h

Fix compile. It seemed better to have memguard.c include opt_vm.h in
case future compile-time knobs were added that it wants to use.
Also add include guards and forward declarations to vm/memguard.h.

Approved by: zml (mentor)
MFC after: 1 month

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Rework memguard(9) to reserve significantly more KVA to detect
use-after-free over a longer time. Also release the backing pages of
a guarded allocation at free(9) time to reduce the overhead of usi

Rework memguard(9) to reserve significantly more KVA to detect
use-after-free over a longer time. Also release the backing pages of
a guarded allocation at free(9) time to reduce the overhead of using
memguard(9). Allow setting and varying the malloc type at run-time.
Add knobs to allow:

- randomly guarding memory
- adding un-backed KVA guard pages to detect underflow and overflow
- a lower limit on the size of allocations that are guarded

Reviewed by: alc
Reviewed by: brueffer, Ulrich Spörlein <uqs spoerlein net> (man page)
Silence from: -arch
Approved by: zml (mentor)
MFC after: 1 month

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Update to current version of head.

Merge svn+ssh://svn.freebsd.org/base/head@206571